/* ─── RESET ─── */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        /* ─── ROOT VARIABLES ─── */
        :root {
            /* Font families */
            --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

            /* Font weights */
            --weight-regular: 400;
            --weight-medium: 500;
            --weight-semibold: 600;
            --weight-bold: 700;

            /* Typography scale — clamped for all viewports */
            --text-xs: clamp(0.625rem, 0.7vw, 0.7rem);
            /* 10–11px */
            --text-sm: clamp(0.7rem, 0.9vw, 0.8rem);
            /* 11–13px */
            --text-base: clamp(0.8125rem, 1.1vw, 0.9375rem);
            /* 13–15px */
            --text-md: clamp(0.875rem, 1.2vw, 1rem);
            /* 14–16px */
            --text-lg: clamp(1rem, 1.5vw, 1.125rem);
            /* 16–18px */
            --text-xl: clamp(1.125rem, 1.8vw, 1.3125rem);
            /* 18–21px */
            --text-2xl: clamp(1.3125rem, 2.2vw, 1.625rem);
            /* 21–26px */
            --text-3xl: clamp(1.625rem, 2.8vw, 2rem);
            /* 26–32px */
            --text-4xl: clamp(2rem, 3.5vw, 2.5rem);
            /* 32–40px */
            --text-5xl: clamp(2.5rem, 4.5vw, 3.25rem);
            /* 40–52px */

            /* Line heights */
            --leading-none: 1;
            --leading-tight: 1.15;
            --leading-snug: 1.3;
            --leading-normal: 1.55;
            --leading-relaxed: 1.7;
            --leading-loose: 2;

            /* Letter spacing */
            --tracking-tight: -0.02em;
            --tracking-normal: 0;
            --tracking-wide: 0.02em;
            --tracking-wider: 0.04em;
            --tracking-widest: 0.08em;

            /* Radius */
            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 28px;
            --radius-full: 9999px;

            /* Easing */
            --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
            --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
            --ease-out: cubic-bezier(0, 0, 0.2, 1);
            --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
            --dur-fast: 180ms;
            --dur-med: 300ms;
            --dur-slow: 450ms;

            /* Glass */
            --glass-blur: 28px;
            --glass-saturate: 180%;
            --glass-opacity: 0.06;
            --glass-border-opacity: 0.10;
            --glass-highlight-opacity: 0.12;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.12);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.20);
            --shadow-xl: 0 32px 80px rgba(0, 0, 0, 0.28);
            --shadow-glow: 0 0 40px var(--accent-glow);
        }

        /* ─── THEME TOKENS ─── */
        [data-theme="dark"] {
            --bg-primary: #05070d;
            --bg-secondary: #080b16;
            --bg-tertiary: #0c1120;
            --surface: rgba(255, 255, 255, 0.04);
            --surface-strong: rgba(255, 255, 255, 0.08);
            --surface-glass: rgba(255, 255, 255, 0.05);
            --surface-glass-strong: rgba(255, 255, 255, 0.10);
            --border: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.16);
            --border-focus: rgba(59, 130, 246, 0.40);
            --highlight: rgba(255, 255, 255, 0.08);
            --highlight-strong: rgba(255, 255, 255, 0.14);
            --text-primary: #f1f5f9;
            --text-secondary: #c8d0dc;
            --text-tertiary: #94a3b8;
            --text-quaternary: #64748b;
            --accent: #3b82f6;
            --accent-2: #60a5fa;
            --accent-glow: rgba(59, 130, 246, 0.30);
            --accent-subtle: rgba(59, 130, 246, 0.12);
            --gradient-accent: linear-gradient(135deg, #3b82f6, #2563eb);
            --gradient-accent-soft: linear-gradient(135deg, rgba(59, 130, 246, 0.25), rgba(37, 99, 235, 0.15));
            --user-bg: linear-gradient(135deg, #3b82f6, #2563eb);
            --user-text: #ffffff;
            --assistant-bg: rgba(255, 255, 255, 0.04);
            --success: #34d399;
            --success-glow: rgba(52, 211, 153, 0.25);
            --danger: #f87171;
            --danger-glow: rgba(248, 113, 113, 0.25);
            --warning: #fbbf24;
            --scrollbar-track: transparent;
            --scrollbar-thumb: rgba(255, 255, 255, 0.15);
            --scrollbar-thumb-hover: rgba(255, 255, 255, 0.25);
            --shadow-color: 0, 0, 0;
            --shadow-ambient: 0 8px 32px rgba(0, 0, 0, 0.35);
            --aurora-1: rgba(59, 130, 246, 0.12);
            --aurora-2: rgba(139, 92, 246, 0.08);
            --aurora-3: rgba(59, 130, 246, 0.06);
            --spotlight-blend: screen;
            --spotlight-opacity: 0.50;
        }

        [data-theme="light"] {
            --bg-primary: #eef2f9;
            --bg-secondary: #e8ecf5;
            --bg-tertiary: #e0e5f0;
            --surface: rgba(255, 255, 255, 0.50);
            --surface-strong: rgba(255, 255, 255, 0.70);
            --surface-glass: rgba(255, 255, 255, 0.45);
            --surface-glass-strong: rgba(255, 255, 255, 0.70);
            --border: rgba(15, 23, 42, 0.07);
            --border-strong: rgba(15, 23, 42, 0.13);
            --border-focus: rgba(37, 99, 235, 0.30);
            --highlight: rgba(255, 255, 255, 0.60);
            --highlight-strong: rgba(255, 255, 255, 0.80);
            --text-primary: #0b1220;
            --text-secondary: #1e293b;
            --text-tertiary: #5b6b84;
            --text-quaternary: #8a9bb5;
            --accent: #2563eb;
            --accent-2: #3b82f6;
            --accent-glow: rgba(37, 99, 235, 0.20);
            --accent-subtle: rgba(37, 99, 235, 0.08);
            --gradient-accent: linear-gradient(135deg, #2563eb, #1d4ed8);
            --gradient-accent-soft: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(29, 78, 216, 0.06));
            --user-bg: linear-gradient(135deg, #2563eb, #1d4ed8);
            --user-text: #ffffff;
            --assistant-bg: rgba(255, 255, 255, 0.50);
            --success: #059669;
            --success-glow: rgba(5, 150, 105, 0.20);
            --danger: #dc2626;
            --danger-glow: rgba(220, 38, 38, 0.20);
            --warning: #d97706;
            --scrollbar-track: transparent;
            --scrollbar-thumb: rgba(15, 23, 42, 0.12);
            --scrollbar-thumb-hover: rgba(15, 23, 42, 0.20);
            --shadow-color: 15, 23, 42;
            --shadow-ambient: 0 8px 32px rgba(15, 23, 42, 0.08);
            --aurora-1: rgba(59, 130, 246, 0.08);
            --aurora-2: rgba(139, 92, 246, 0.05);
            --aurora-3: rgba(59, 130, 246, 0.04);
            --spotlight-blend: multiply;
            --spotlight-opacity: 0.25;
        }

        /* ─── BASE ─── */
        html {
            font-size: 16px;
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.001ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.001ms !important;
                scroll-behavior: auto !important;
            }
        }

        body {
            font-family: var(--font-body);
            font-weight: var(--weight-regular);
            font-size: var(--text-md);
            line-height: var(--leading-normal);
            letter-spacing: var(--tracking-normal);
            color: var(--text-primary);
            background: var(--bg-primary);
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            flex-direction: column;
            transition: background var(--dur-med) var(--ease-smooth), color var(--dur-med) var(--ease-smooth);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            position: relative;
            overflow-x: hidden;
        }

        /* Scrollbar */
        ::-webkit-scrollbar {
            width: 5px;
            height: 5px;
        }
        ::-webkit-scrollbar-track {
            background: var(--scrollbar-track);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--scrollbar-thumb);
            border-radius: 8px;
            transition: background var(--dur-fast) ease;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--scrollbar-thumb-hover);
        }

        /* ─── TYPOGRAPHY ELEMENTS ─── */

        /* Headings — using Outfit with tight tracking */
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            line-height: var(--leading-tight);
            letter-spacing: var(--tracking-tight);
            color: var(--text-primary);
            margin: 0 0 0.3em 0;
        }

        h1 {
            font-size: var(--text-4xl);
            font-weight: var(--weight-bold);
        }
        h2 {
            font-size: var(--text-3xl);
            font-weight: var(--weight-bold);
        }
        h3 {
            font-size: var(--text-2xl);
            font-weight: var(--weight-semibold);
        }
        h4 {
            font-size: var(--text-xl);
            font-weight: var(--weight-semibold);
        }
        h5 {
            font-size: var(--text-lg);
            font-weight: var(--weight-semibold);
        }
        h6 {
            font-size: var(--text-base);
            font-weight: var(--weight-semibold);
            letter-spacing: var(--tracking-wide);
            text-transform: uppercase;
        }

        /* Paragraphs & body text */
        p {
            font-size: var(--text-md);
            line-height: var(--leading-relaxed);
            color: var(--text-secondary);
            margin: 0 0 0.8em 0;
        }

        /* Small text / captions / meta */
        small,
        .text-sm,
        .caption,
        .meta {
            font-size: var(--text-sm);
            line-height: var(--leading-snug);
            color: var(--text-tertiary);
            letter-spacing: var(--tracking-wide);
        }

        .text-xs {
            font-size: var(--text-xs);
            line-height: var(--leading-snug);
            color: var(--text-tertiary);
            letter-spacing: var(--tracking-wide);
        }

        /* Links */
        a {
            color: var(--accent-2);
            text-decoration: none;
            transition: color var(--dur-fast) ease;
        }
        a:hover {
            color: var(--accent);
        }

        /* Strong / bold */
        strong,
        b {
            font-weight: var(--weight-semibold);
            color: var(--text-primary);
        }

        /* Code & Monospace */
        code,
        kbd,
        samp,
        pre {
            font-family: var(--font-mono);
            font-size: var(--text-sm);
            line-height: var(--leading-loose);
            letter-spacing: var(--tracking-normal);
        }

        code {
            background: rgba(0, 0, 0, 0.18);
            padding: 0.1em 0.45em;
            border-radius: var(--radius-xs);
            font-size: 0.85em;
            color: var(--text-secondary);
            font-weight: var(--weight-medium);
            font-family: var(--font-mono);
        }
        [data-theme="light"] code {
            background: rgba(15, 23, 42, 0.07);
        }

        pre {
            background: rgba(0, 0, 0, 0.22);
            padding: 0.8rem 1rem;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            border: 1px solid var(--border);
            margin: 0.6rem 0;
            font-size: var(--text-sm);
            line-height: var(--leading-loose);
            color: var(--text-secondary);
        }
        [data-theme="light"] pre {
            background: rgba(15, 23, 42, 0.05);
        }
        pre code {
            background: none;
            padding: 0;
            font-size: inherit;
            color: inherit;
            font-weight: var(--weight-regular);
        }

        kbd {
            background: var(--surface-glass);
            border: 1px solid var(--border);
            padding: 0.1em 0.6em;
            border-radius: var(--radius-xs);
            font-size: 0.75em;
            font-family: var(--font-mono);
            color: var(--text-tertiary);
            font-weight: var(--weight-medium);
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
        }

        /* Blockquote */
        blockquote {
            border-left: 2.5px solid var(--accent);
            padding-left: 0.8rem;
            margin: 0.4rem 0;
            color: var(--text-tertiary);
            font-size: 0.9em;
            line-height: var(--leading-relaxed);
        }

        /* Lists */
        ul,
        ol {
            padding-left: 1.2rem;
            margin: 0.4rem 0;
            color: var(--text-secondary);
            line-height: var(--leading-relaxed);
        }
        li {
            margin: 0.1rem 0;
        }

        /* HR */
        hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 0.8rem 0;
        }

        /* ─── GLASS UTILITY ─── */
        .glass {
            background: var(--surface-glass);
            backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm), inset 0 1px 0 var(--highlight);
        }

        .glass-strong {
            background: var(--surface-glass-strong);
            backdrop-filter: blur(32px) saturate(190%);
            -webkit-backdrop-filter: blur(32px) saturate(190%);
            border: 1px solid var(--border-strong);
            box-shadow: var(--shadow-md), inset 0 1px 0 var(--highlight-strong);
        }

        .glass-card {
            background: var(--surface);
            backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm), inset 0 1px 0 var(--highlight);
            border-radius: var(--radius-md);
            transition: transform var(--dur-med) var(--ease-spring), box-shadow var(--dur-med) var(--ease-smooth), border-color var(--dur-med) var(--ease-smooth);
        }

        .glass-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md), inset 0 1px 0 var(--highlight-strong);
            border-color: var(--border-strong);
        }

        /* ─── AMBIENT BACKGROUNDS ─── */
        .aurora {
            position: fixed;
            inset: 0;
            z-index: -2;
            pointer-events: none;
            background:
                radial-gradient(720px circle at 12% 6%, var(--aurora-1), transparent 60%),
                radial-gradient(660px circle at 90% 15%, var(--aurora-2), transparent 55%),
                radial-gradient(840px circle at 50% 100%, var(--aurora-3), transparent 60%);
            filter: blur(12px);
            animation: auroraDrift 24s ease-in-out infinite alternate;
            will-change: transform;
        }

        @keyframes auroraDrift {
            0% {
                transform: translate3d(0, 0, 0) scale(1);
            }
            100% {
                transform: translate3d(-1.5%, 1.5%, 0) scale(1.06);
            }
        }

        .noise {
            position: fixed;
            inset: 0;
            z-index: -1;
            pointer-events: none;
            opacity: 0.018;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
        }

        .spotlight {
            position: fixed;
            inset: 0;
            z-index: 0;
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.5s ease;
            background: radial-gradient(400px circle at var(--sx, 50%) var(--sy, 50%), var(--accent-glow), transparent 70%);
            mix-blend-mode: var(--spotlight-blend);
            will-change: opacity;
        }
        body.has-mouse .spotlight {
            opacity: var(--spotlight-opacity);
        }
        [data-theme="light"] body.has-mouse .spotlight {
            opacity: 0.20;
        }
        @media (hover: none) {
            .spotlight {
                display: none;
            }
        }

        /* ─── SCROLL PROGRESS ─── */
        .scroll-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 2.5px;
            width: 0%;
            background: var(--gradient-accent);
            background-size: 200% 100%;
            z-index: 60;
            transition: width 0.08s linear;
            box-shadow: 0 0 16px var(--accent-glow);
            border-radius: 0 2px 2px 0;
        }

        /* ─── HEADER ─── */
        header {
            position: sticky;
            top: 0;
            z-index: 30;
            padding: 0.5rem 1.2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 58px;
            gap: 0.8rem;
            background: var(--surface-glass);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid var(--border);
            transition: background var(--dur-med) var(--ease-smooth), border-color var(--dur-med) var(--ease-smooth), box-shadow var(--dur-med) var(--ease-smooth);
            flex-shrink: 0;
            font-family: var(--font-body);
        }

        header.scrolled {
            background: var(--surface-glass-strong);
            border-bottom-color: var(--border-strong);
            box-shadow: var(--shadow-sm);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.65rem;
            text-decoration: none;
            color: var(--text-primary);
            font-family: var(--font-heading);
            flex-shrink: 0;
        }

        .logo-img {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-strong);
            padding: 2px;
            background: var(--surface-glass);
            object-fit: contain;
            transition: transform var(--dur-med) var(--ease-spring), box-shadow var(--dur-med) var(--ease-smooth);
            box-shadow: 0 0 0 0 var(--accent-glow);
            flex-shrink: 0;
        }
        .logo:hover .logo-img {
            transform: rotate(-4deg) scale(1.04);
            box-shadow: 0 0 24px var(--accent-glow);
        }

        .logo-text {
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            font-size: var(--text-lg);
            letter-spacing: var(--tracking-tight);
            background: var(--gradient-accent);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: var(--leading-tight);
        }
        .logo-text small {
            display: block;
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            letter-spacing: var(--tracking-wider);
            text-transform: uppercase;
            color: var(--text-tertiary);
            -webkit-text-fill-color: var(--text-tertiary);
            background: none;
            margin-top: 1px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }

        /* ─── ICON SYSTEM (inline SVG sprite, stroke-based) ─── */
        .icon {
            width: 18px;
            height: 18px;
            flex-shrink: 0;
            fill: none;
            stroke: currentColor;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
            display: inline-block;
            vertical-align: middle;
            pointer-events: none;
        }
        .icon-sm { width: 14px; height: 14px; }
        .icon-lg { width: 22px; height: 22px; }
        .icon-xl { width: 34px; height: 34px; stroke-width: 1.6; }

        .icon-btn {
            width: 38px;
            height: 38px;
            min-width: 38px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: var(--text-md);
            transition: transform var(--dur-fast) var(--ease-spring), background var(--dur-fast) ease, border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease, color var(--dur-fast) ease;
            flex-shrink: 0;
            font-family: var(--font-body);
            position: relative;
            background: transparent;
            border: 1px solid transparent;
        }
        .icon-btn:hover {
            background: var(--surface-glass-strong);
            border-color: var(--border-strong);
            color: var(--text-primary);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }
        .icon-btn:active {
            transform: scale(0.92);
        }
        .icon-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .settings-toggle {
            display: flex;
            align-items: center;
            gap: 5px;
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            color: var(--text-tertiary);
            cursor: pointer;
            padding: 7px 12px 7px 10px;
            border-radius: var(--radius-sm);
            transition: all var(--dur-fast) var(--ease-smooth);
            background: transparent;
            border: 1px solid transparent;
            letter-spacing: var(--tracking-wide);
            text-transform: uppercase;
        }
        .settings-toggle:hover {
            color: var(--text-primary);
            background: var(--surface-glass-strong);
            border-color: var(--border-strong);
            transform: translateY(-1px);
        }
        .settings-toggle.active {
            color: var(--accent);
            border-color: var(--accent-subtle);
            background: var(--accent-subtle);
        }
        .settings-toggle .label {
            transition: opacity var(--dur-fast) ease;
        }
        @media (max-width: 600px) {
            .settings-toggle .label {
                display: none;
            }
            .settings-toggle {
                padding: 7px 10px;
            }
        }

        /* ─── SETTINGS PANEL ─── */
        .settings-panel {
            margin: 0 0.8rem;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
            transition: max-height 0.45s var(--ease-smooth), padding 0.45s var(--ease-smooth), opacity 0.35s ease, margin 0.45s var(--ease-smooth);
            flex-shrink: 0;
            border-radius: var(--radius-md);
            background: var(--surface-glass);
            backdrop-filter: blur(32px) saturate(190%);
            -webkit-backdrop-filter: blur(32px) saturate(190%);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-md), inset 0 1px 0 var(--highlight);
        }
        .settings-panel.open {
            max-height: 800px;
            padding: 1.1rem 1.2rem 1.2rem;
            opacity: 1;
            margin: 0 0.8rem 0.8rem;
        }

        .settings-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 0.8rem 1.2rem;
            align-items: end;
        }

        .field {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .field label {
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            text-transform: uppercase;
            letter-spacing: var(--tracking-wide);
            color: var(--text-tertiary);
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .field input,
        .field select {
            background: var(--surface-glass);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 9px 12px;
            color: var(--text-primary);
            font-family: var(--font-body);
            font-size: var(--text-sm);
            outline: none;
            transition: border var(--dur-fast) ease, box-shadow var(--dur-fast) ease, background var(--dur-fast) ease;
            min-height: 40px;
            width: 100%;
            appearance: auto;
            font-weight: var(--weight-regular);
            line-height: var(--leading-snug);
        }
        .field select {
            cursor: pointer;
            appearance: auto;
        }
        .field select option {
            background: var(--bg-secondary);
            color: var(--text-primary);
            font-family: var(--font-body);
        }
        [data-theme="light"] .field select option {
            background: #ffffff;
            color: var(--text-primary);
        }

        .field input:focus,
        .field select:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-subtle);
            background: var(--surface-glass-strong);
        }

        .field .api-wrap {
            position: relative;
        }
        .field .api-wrap input {
            padding-right: 40px;
        }
        .field .api-wrap .eye {
            position: absolute;
            right: 4px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--text-tertiary);
            cursor: pointer;
            font-size: var(--text-base);
            padding: 6px 8px;
            border-radius: var(--radius-xs);
            transition: color var(--dur-fast) ease, background var(--dur-fast) ease;
        }
        .field .api-wrap .eye:hover {
            color: var(--accent);
            background: var(--surface-glass);
        }

        .field .hint {
            font-size: var(--text-xs);
            color: var(--text-tertiary);
            margin-top: 2px;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
            justify-content: space-between;
            font-family: var(--font-body);
            letter-spacing: var(--tracking-normal);
        }
        .field .hint a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--dur-fast) ease;
            font-weight: var(--weight-medium);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .field .hint a:hover {
            text-decoration: underline;
            color: var(--accent-2);
        }

        .checkbox-row {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: var(--text-xs);
            color: var(--text-tertiary);
            cursor: pointer;
            user-select: none;
            white-space: nowrap;
            font-weight: var(--weight-medium);
            font-family: var(--font-body);
        }
        .checkbox-row input {
            width: 14px;
            height: 14px;
            min-height: unset;
            accent-color: var(--accent);
            cursor: pointer;
            flex-shrink: 0;
        }

        .settings-actions {
            display: flex;
            gap: 6px;
            align-items: center;
            flex-wrap: wrap;
            margin-top: 2px;
        }

        .btn {
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            padding: 9px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            cursor: pointer;
            transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-fast) ease, filter var(--dur-fast) ease, background var(--dur-fast) ease, border-color var(--dur-fast) ease, color var(--dur-fast) ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
            min-height: 38px;
            white-space: nowrap;
            position: relative;
            overflow: hidden;
            text-decoration: none;
            letter-spacing: var(--tracking-wide);
            text-transform: uppercase;
        }
        .btn:active {
            transform: scale(0.96);
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--gradient-accent);
            color: #fff;
            box-shadow: 0 4px 16px var(--accent-glow);
        }
        .btn-primary:hover {
            filter: brightness(1.08);
            box-shadow: 0 6px 24px var(--accent-glow);
            transform: translateY(-1px);
        }
        .btn-primary:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
            filter: none;
            box-shadow: none;
        }

        .btn-secondary {
            background: var(--surface-glass);
            border-color: var(--border);
            color: var(--text-secondary);
        }
        .btn-secondary:hover {
            border-color: var(--border-strong);
            background: var(--surface-glass-strong);
            color: var(--text-primary);
            transform: translateY(-1px);
        }

        .btn-danger-outline {
            background: transparent;
            border-color: var(--border);
            color: var(--danger);
        }
        .btn-danger-outline:hover {
            border-color: var(--danger);
            background: var(--danger-glow);
            box-shadow: 0 0 16px var(--danger-glow);
            transform: translateY(-1px);
        }

        .btn-sm {
            font-size: var(--text-xs);
            padding: 5px 10px;
            min-height: 30px;
            letter-spacing: var(--tracking-wide);
        }

        .btn-ghost {
            background: transparent;
            border-color: transparent;
            color: var(--text-tertiary);
        }
        .btn-ghost:hover {
            background: var(--surface-glass);
            border-color: var(--border);
            color: var(--text-primary);
        }

        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            font-size: var(--text-xs);
            font-weight: var(--weight-semibold);
            color: var(--text-tertiary);
            padding: 5px 12px;
            border-radius: var(--radius-full);
            border: 1px solid var(--border);
            font-family: var(--font-body);
            background: var(--surface-glass);
            white-space: nowrap;
            letter-spacing: var(--tracking-wide);
        }
        .status-badge .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--danger);
            transition: background 0.4s ease, box-shadow 0.4s ease;
            flex-shrink: 0;
        }
        .status-badge .dot.on {
            background: var(--success);
            box-shadow: 0 0 10px var(--success-glow);
            animation: dotPulse 2.4s ease-in-out infinite;
        }
        @keyframes dotPulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.6;
                transform: scale(0.85);
            }
        }

        .advanced-toggle {
            cursor: pointer;
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            text-transform: uppercase;
            letter-spacing: var(--tracking-wide);
            color: var(--text-tertiary);
            background: none;
            border: none;
            padding: 6px 0;
            transition: color var(--dur-fast) ease;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .advanced-toggle:hover {
            color: var(--text-primary);
        }
        .advanced-toggle .arrow {
            transition: transform var(--dur-med) var(--ease-smooth);
            display: inline-block;
        }
        .advanced-toggle.open .arrow {
            transform: rotate(180deg);
        }

        .advanced-content {
            max-height: 0;
            overflow: hidden;
            opacity: 0;
            transition: max-height 0.4s var(--ease-smooth), opacity 0.3s ease, padding 0.4s var(--ease-smooth);
        }
        .advanced-content.open {
            max-height: 120px;
            opacity: 1;
            padding-top: 0.6rem;
        }

        .slider-row {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.2rem;
            margin-top: 0.6rem;
            align-items: center;
        }
        .slider-group {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            min-width: 120px;
        }
        .slider-group label {
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            text-transform: uppercase;
            letter-spacing: var(--tracking-wide);
            color: var(--text-tertiary);
            white-space: nowrap;
        }
        .slider-group input[type="range"] {
            flex: 1;
            accent-color: var(--accent);
            height: 3px;
            cursor: pointer;
            min-height: unset;
            background: var(--border);
            border-radius: 4px;
            appearance: none;
            -webkit-appearance: none;
            transition: background var(--dur-fast) ease;
        }
        .slider-group input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--gradient-accent);
            cursor: pointer;
            box-shadow: 0 2px 8px var(--accent-glow);
            transition: transform var(--dur-fast) var(--ease-spring);
        }
        .slider-group input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.15);
        }
        .slider-group input[type="range"]::-moz-range-thumb {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--gradient-accent);
            cursor: pointer;
            border: none;
            box-shadow: 0 2px 8px var(--accent-glow);
        }
        .slider-value {
            font-family: var(--font-mono);
            font-weight: var(--weight-medium);
            font-size: var(--text-sm);
            min-width: 32px;
            text-align: center;
            color: var(--accent);
            font-variant-numeric: tabular-nums;
            letter-spacing: var(--tracking-normal);
        }

        /* ─── CHAT AREA ─── */
        .chat-container {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-height: 0;
            overflow: hidden;
            position: relative;
        }

        .messages {
            flex: 1;
            overflow-y: auto;
            padding: 1.2rem 1.4rem 0.4rem;
            display: flex;
            flex-direction: column;
            gap: 0.9rem;
            scroll-behavior: smooth;
            -webkit-overflow-scrolling: touch;
        }

        .jump-bottom {
            position: absolute;
            bottom: 16px;
            left: 50%;
            transform: translateX(-50%) translateY(16px);
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-family: var(--font-body);
            font-weight: var(--weight-semibold);
            font-size: var(--text-xs);
            display: flex;
            align-items: center;
            gap: 5px;
            cursor: pointer;
            z-index: 5;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s var(--ease-spring), box-shadow 0.3s ease;
            background: var(--surface-glass-strong);
            backdrop-filter: blur(24px) saturate(180%);
            -webkit-backdrop-filter: blur(24px) saturate(180%);
            border: 1px solid var(--border-strong);
            box-shadow: var(--shadow-md), inset 0 1px 0 var(--highlight);
            color: var(--text-secondary);
            letter-spacing: var(--tracking-normal);
        }
        .jump-bottom.show {
            opacity: 1;
            pointer-events: all;
            transform: translateX(-50%) translateY(0);
        }
        .jump-bottom:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow);
            color: var(--text-primary);
            transform: translateX(-50%) translateY(-1px);
        }

        .welcome {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            height: 100%;
            max-width: 480px;
            margin: auto;
            gap: 0.6rem;
            padding: 1.6rem 1.2rem;
            animation: fadeUp 0.6s var(--ease-spring) forwards;
        }
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(18px) scale(0.98);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .welcome .icon-orb {
            width: 72px;
            height: 72px;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin-bottom: 0.2rem;
            background: var(--gradient-accent);
            box-shadow: 0 12px 40px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.30);
            animation: orbFloat 5s ease-in-out infinite;
            color: #fff;
            font-family: var(--font-heading);
        }
        @keyframes orbFloat {
            0%,
            100% {
                transform: translateY(0) rotate(0deg);
            }
            50% {
                transform: translateY(-8px) rotate(3deg);
            }
        }

        .welcome h2 {
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            font-size: var(--text-2xl);
            letter-spacing: var(--tracking-tight);
            color: var(--text-primary);
            margin: 0;
        }
        .welcome p {
            font-family: var(--font-body);
            font-size: var(--text-base);
            color: var(--text-tertiary);
            line-height: var(--leading-relaxed);
            max-width: 400px;
            margin: 0;
        }
        .welcome p strong {
            color: var(--accent);
            font-weight: var(--weight-semibold);
        }

        .suggestion-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            justify-content: center;
            margin-top: 0.4rem;
        }
        .chip {
            font-family: var(--font-body);
            font-weight: var(--weight-medium);
            font-size: var(--text-xs);
            padding: 7px 14px;
            border-radius: var(--radius-full);
            cursor: pointer;
            color: var(--text-tertiary);
            transition: all var(--dur-fast) var(--ease-smooth);
            background: var(--surface-glass);
            border: 1px solid var(--border);
            letter-spacing: var(--tracking-normal);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .chip:hover {
            color: var(--text-primary);
            border-color: var(--accent);
            background: var(--accent-subtle);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
        }
        .chip:active {
            transform: scale(0.96);
        }

        /* ─── MESSAGES ─── */
        .msg {
            display: flex;
            gap: 10px;
            max-width: 82%;
            animation: slideUp 0.35s var(--ease-spring) forwards;
            opacity: 0;
            transform: translateY(10px) scale(0.98);
        }
        @keyframes slideUp {
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .msg.user {
            align-self: flex-end;
            flex-direction: row-reverse;
        }
        .msg.assistant {
            align-self: flex-start;
        }

        .msg .avatar {
            width: 32px;
            height: 32px;
            min-width: 32px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            font-size: var(--text-xs);
            flex-shrink: 0;
            margin-top: 2px;
        }
        .msg.assistant .avatar {
            background: var(--gradient-accent-soft);
            border: 1px solid var(--accent-subtle);
            color: var(--accent-2);
        }
        .msg.user .avatar {
            background: var(--gradient-accent);
            color: #fff;
            box-shadow: 0 4px 14px var(--accent-glow);
        }

        .msg .bubble-wrap {
            display: flex;
            flex-direction: column;
            gap: 3px;
            min-width: 0;
        }
        .msg.user .bubble-wrap {
            align-items: flex-end;
        }

        .msg .bubble {
            padding: 10px 16px;
            border-radius: var(--radius-md);
            font-family: var(--font-body);
            font-size: var(--text-base);
            line-height: var(--leading-relaxed);
            word-break: break-word;
            overflow-wrap: break-word;
            transition: transform 0.2s var(--ease-smooth);
            color: var(--text-secondary);
        }
        .msg.user .bubble {
            background: var(--gradient-accent);
            color: var(--user-text);
            border: none;
            border-bottom-right-radius: 4px;
            box-shadow: 0 8px 28px var(--accent-glow);
        }
        .msg.assistant .bubble {
            background: var(--assistant-bg);
            backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm), inset 0 1px 0 var(--highlight);
            border-bottom-left-radius: 4px;
        }

        .msg .bubble code {
            background: rgba(0, 0, 0, 0.20);
            padding: 1px 6px;
            border-radius: 4px;
            font-size: 0.8em;
            font-family: var(--font-mono);
            color: var(--text-primary);
            font-weight: var(--weight-medium);
        }
        [data-theme="light"] .msg .bubble code {
            background: rgba(0, 0, 0, 0.06);
        }
        .msg .bubble pre {
            background: rgba(0, 0, 0, 0.22);
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            font-size: var(--text-sm);
            font-family: var(--font-mono);
            margin: 6px 0;
            border: 1px solid var(--border);
            color: var(--text-secondary);
            line-height: var(--leading-loose);
        }
        [data-theme="light"] .msg .bubble pre {
            background: rgba(15, 23, 42, 0.05);
        }
        .msg .bubble pre code {
            background: none;
            padding: 0;
            font-size: inherit;
            color: inherit;
            font-weight: var(--weight-regular);
        }
        .msg .bubble blockquote {
            border-left: 2.5px solid var(--accent);
            padding-left: 12px;
            color: var(--text-tertiary);
            margin: 5px 0;
            font-size: 0.9em;
            font-family: var(--font-body);
        }
        .msg .bubble a {
            color: var(--accent-2);
            text-decoration: underline;
            text-underline-offset: 2px;
            transition: color var(--dur-fast) ease;
            font-weight: var(--weight-medium);
        }
        .msg .bubble a:hover {
            color: var(--accent);
        }
        .msg .bubble strong {
            font-weight: var(--weight-semibold);
            color: var(--text-primary);
        }
        .msg .bubble h1,
        .msg .bubble h2,
        .msg .bubble h3,
        .msg .bubble h4 {
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            margin: 0.4em 0 0.2em;
            color: var(--text-primary);
            letter-spacing: var(--tracking-tight);
            line-height: var(--leading-tight);
        }
        .msg .bubble h1 {
            font-size: var(--text-xl);
        }
        .msg .bubble h2 {
            font-size: var(--text-lg);
        }
        .msg .bubble h3 {
            font-size: var(--text-base);
        }
        .msg .bubble ul,
        .msg .bubble ol {
            padding-left: 1.2rem;
            margin: 0.3rem 0;
            color: var(--text-secondary);
            font-family: var(--font-body);
        }
        .msg .bubble li {
            margin: 0.1rem 0;
        }
        .msg .bubble hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 0.6rem 0;
        }

        .msg-meta {
            font-family: var(--font-mono);
            font-size: var(--text-xs);
            color: var(--text-quaternary);
            padding: 0 4px;
            font-variant-numeric: tabular-nums;
            letter-spacing: var(--tracking-normal);
        }

        .msg .actions {
            display: flex;
            gap: 4px;
            opacity: 0;
            transition: opacity var(--dur-med) ease;
            flex-wrap: wrap;
        }
        .msg:hover .actions,
        .msg:focus-within .actions {
            opacity: 1;
        }
        @media (max-width: 640px) {
            .msg .actions {
                opacity: 1;
            }
        }

        .msg .actions button {
            background: var(--surface-glass);
            border: 1px solid var(--border);
            color: var(--text-tertiary);
            padding: 3px 10px;
            border-radius: var(--radius-xs);
            cursor: pointer;
            font-family: var(--font-body);
            font-weight: var(--weight-medium);
            font-size: var(--text-xs);
            transition: all var(--dur-fast) ease;
            min-height: 24px;
            display: inline-flex;
            align-items: center;
            gap: 3px;
            letter-spacing: var(--tracking-normal);
        }
        .msg .actions button:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: var(--accent-subtle);
        }
        .msg .actions button.copied {
            border-color: var(--success);
            color: var(--success);
            background: var(--success-glow);
        }

        .typing {
            display: flex;
            gap: 4px;
            padding: 4px 2px;
            align-items: center;
        }
        .typing span {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent);
            animation: wave 1.4s infinite;
            opacity: 0.6;
        }
        .typing span:nth-child(2) {
            animation-delay: 0.15s;
        }
        .typing span:nth-child(3) {
            animation-delay: 0.30s;
        }
        @keyframes wave {
            0%,
            60%,
            100% {
                transform: translateY(0);
                opacity: 0.6;
            }
            30% {
                transform: translateY(-6px);
                opacity: 1;
            }
        }

        /* ─── INPUT AREA ─── */
        .input-area {
            padding: 0.6rem 1.2rem 0.9rem;
            flex-shrink: 0;
        }

        .quick-row {
            display: flex;
            gap: 6px;
            margin-bottom: 6px;
            overflow-x: auto;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }
        .quick-row::-webkit-scrollbar {
            display: none;
        }
        .quick-row .quick-chip {
            font-family: var(--font-body);
            font-weight: var(--weight-medium);
            font-size: var(--text-xs);
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: var(--surface-glass);
            border: 1px solid var(--border);
            color: var(--text-tertiary);
            cursor: pointer;
            white-space: nowrap;
            transition: all var(--dur-fast) ease;
            flex-shrink: 0;
            letter-spacing: var(--tracking-normal);
        }
        .quick-row .quick-chip:hover {
            border-color: var(--accent);
            color: var(--text-primary);
            background: var(--accent-subtle);
            transform: translateY(-1px);
        }

        .input-form {
            display: flex;
            gap: 8px;
            border-radius: var(--radius-lg);
            padding: 4px 4px 4px 16px;
            align-items: flex-end;
            background: var(--surface-glass);
            backdrop-filter: blur(24px) saturate(180%);
            -webkit-backdrop-filter: blur(24px) saturate(180%);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm), inset 0 1px 0 var(--highlight);
            transition: border var(--dur-fast) ease, box-shadow var(--dur-fast) ease, background var(--dur-fast) ease;
        }
        .input-form:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-subtle), var(--shadow-sm);
            background: var(--surface-glass-strong);
        }

        .input-form textarea {
            flex: 1;
            background: transparent;
            border: none;
            outline: none;
            color: var(--text-primary);
            font-family: var(--font-body);
            font-weight: var(--weight-regular);
            font-size: var(--text-md);
            resize: none;
            max-height: 140px;
            min-height: 24px;
            padding: 9px 0;
            line-height: var(--leading-normal);
            letter-spacing: var(--tracking-normal);
        }
        .input-form textarea::placeholder {
            color: var(--text-tertiary);
            opacity: 0.5;
            font-weight: var(--weight-regular);
        }
        .input-form textarea::-webkit-scrollbar {
            width: 3px;
        }
        .input-form textarea::-webkit-scrollbar-thumb {
            background: var(--border-strong);
            border-radius: 4px;
        }

        .input-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 3px 4px 0;
            font-family: var(--font-mono);
            font-size: var(--text-xs);
            color: var(--text-tertiary);
            font-variant-numeric: tabular-nums;
            letter-spacing: var(--tracking-normal);
        }
        .input-meta .kbd {
            font-family: var(--font-mono);
            font-size: var(--text-xs);
            padding: 1px 6px;
            border-radius: 4px;
            background: var(--surface-glass);
            border: 1px solid var(--border);
            color: var(--text-quaternary);
            font-weight: var(--weight-medium);
        }

        .send-btn {
            width: 44px;
            height: 44px;
            min-width: 44px;
            border-radius: var(--radius-md);
            background: var(--gradient-accent);
            color: #fff;
            border: none;
            cursor: pointer;
            font-size: var(--text-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-fast) ease, filter var(--dur-fast) ease, background var(--dur-fast) ease;
            box-shadow: 0 4px 16px var(--accent-glow);
            flex-shrink: 0;
            position: relative;
            font-family: var(--font-body);
        }
        .send-btn:hover:not(:disabled) {
            filter: brightness(1.08);
            box-shadow: 0 6px 24px var(--accent-glow);
            transform: translateY(-1px) scale(1.02);
        }
        .send-btn:active:not(:disabled) {
            transform: scale(0.93);
        }
        .send-btn:disabled:not(.stop-mode) {
            opacity: 0.35;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
            filter: none;
        }
        .send-btn.stop-mode {
            background: var(--danger);
            box-shadow: 0 4px 16px var(--danger-glow);
            cursor: pointer;
            opacity: 1;
        }
        .send-btn.stop-mode:hover {
            filter: brightness(1.08);
            box-shadow: 0 6px 24px var(--danger-glow);
        }
        .send-btn .spinner-ring {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            border: 2.5px solid rgba(255, 255, 255, 0.30);
            border-top-color: #fff;
            animation: spin 0.7s linear infinite;
        }
        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }
        .send-btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ─── TOASTS ─── */
        .toasts {
            position: fixed;
            top: 76px;
            right: 16px;
            z-index: 100;
            display: flex;
            flex-direction: column;
            gap: 6px;
            max-width: 340px;
            pointer-events: none;
        }
        .toast {
            padding: 10px 16px;
            font-family: var(--font-body);
            font-weight: var(--weight-medium);
            font-size: var(--text-sm);
            border-radius: var(--radius-sm);
            animation: toastIn 0.4s var(--ease-spring), toastOut 0.3s ease 3.6s forwards;
            pointer-events: all;
            border-left: 3px solid var(--accent);
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--surface-glass-strong);
            backdrop-filter: blur(24px) saturate(180%);
            -webkit-backdrop-filter: blur(24px) saturate(180%);
            border: 1px solid var(--border-strong);
            box-shadow: var(--shadow-md), inset 0 1px 0 var(--highlight);
            color: var(--text-secondary);
            letter-spacing: var(--tracking-normal);
            line-height: var(--leading-snug);
        }
        .toast.error {
            border-left-color: var(--danger);
        }
        .toast.success {
            border-left-color: var(--success);
        }
        @keyframes toastIn {
            from {
                opacity: 0;
                transform: translateX(28px) scale(0.94);
            }
            to {
                opacity: 1;
                transform: translateX(0) scale(1);
            }
        }
        @keyframes toastOut {
            from {
                opacity: 1;
            }
            to {
                opacity: 0;
                transform: translateX(28px);
            }
        }

        /* ─── HISTORY DRAWER ─── */
        .drawer-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.45);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            z-index: 98;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--dur-med) ease;
        }
        .drawer-overlay.open {
            opacity: 1;
            pointer-events: all;
        }

        .history-drawer {
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            width: 380px;
            max-width: 85vw;
            background: var(--surface-glass-strong);
            backdrop-filter: blur(36px) saturate(190%);
            -webkit-backdrop-filter: blur(36px) saturate(190%);
            border-left: 1px solid var(--border-strong);
            box-shadow: var(--shadow-xl);
            z-index: 99;
            display: flex;
            flex-direction: column;
            transform: translateX(100%);
            transition: transform var(--dur-slow) var(--ease-smooth);
            font-family: var(--font-body);
        }
        .history-drawer.open {
            transform: translateX(0);
        }

        .drawer-header {
            padding: 1rem 1.2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
            min-height: 60px;
        }
        .drawer-header h3 {
            font-family: var(--font-heading);
            font-weight: var(--weight-bold);
            font-size: var(--text-lg);
            letter-spacing: var(--tracking-tight);
            color: var(--text-primary);
            margin: 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .drawer-header-actions {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .drawer-body {
            flex: 1;
            overflow-y: auto;
            padding: 1rem;
        }

        .history-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
            padding: 0;
            margin: 0;
        }
        .history-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            background: var(--surface);
            border: 1px solid var(--border);
            cursor: pointer;
            transition: all var(--dur-fast) ease;
            gap: 8px;
        }
        .history-item:hover {
            background: var(--surface-glass-strong);
            border-color: var(--accent-subtle);
            transform: translateY(-1px);
        }
        .history-item.active {
            border-color: var(--accent);
            background: var(--accent-subtle);
            box-shadow: 0 0 0 1px var(--accent-subtle);
        }
        .history-item .info {
            display: flex;
            flex-direction: column;
            gap: 2px;
            overflow: hidden;
            flex: 1;
            min-width: 0;
        }
        .history-item .title {
            font-family: var(--font-body);
            font-weight: var(--weight-medium);
            font-size: var(--text-sm);
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            letter-spacing: var(--tracking-normal);
        }
        .history-item .date {
            font-family: var(--font-mono);
            font-size: var(--text-xs);
            color: var(--text-tertiary);
            font-variant-numeric: tabular-nums;
            letter-spacing: var(--tracking-normal);
        }
        .history-item .del-btn {
            background: transparent;
            border: none;
            color: var(--text-tertiary);
            cursor: pointer;
            padding: 4px 6px;
            border-radius: var(--radius-xs);
            font-size: var(--text-base);
            transition: all var(--dur-fast) ease;
            flex-shrink: 0;
            font-family: var(--font-body);
        }
        .history-item .del-btn:hover {
            color: var(--danger);
            background: var(--danger-glow);
        }

        .history-empty {
            text-align: center;
            color: var(--text-tertiary);
            font-family: var(--font-body);
            font-size: var(--text-sm);
            padding: 2rem 1rem;
            display: flex;
            flex-direction: column;
            gap: 8px;
            align-items: center;
            line-height: var(--leading-relaxed);
        }
        .history-empty .empty-icon {
            opacity: 0.35;
            color: var(--text-tertiary);
        }
        .history-empty .empty-icon .icon {
            width: 34px;
            height: 34px;
        }

        @media (max-width: 600px) {
            .history-drawer {
                width: 85vw;
                max-width: 85vw;
            }
            .drawer-header {
                padding: 0.8rem 1rem;
                min-height: 52px;
            }
            .drawer-header h3 {
                font-size: var(--text-base);
            }
            .drawer-body {
                padding: 0.8rem;
            }
            .history-item {
                padding: 8px 10px;
            }
            .history-item .title {
                font-size: var(--text-sm);
            }
        }
        @media (max-width: 400px) {
            .history-drawer {
                width: 90vw;
                max-width: 90vw;
            }
        }
        @media (min-width: 1200px) {
            .history-drawer {
                width: 420px;
                max-width: 42vw;
            }
        }
        @media (min-width: 1600px) {
            .history-drawer {
                width: 480px;
                max-width: 36vw;
            }
        }

        /* ─── RESPONSIVE ─── */
        @media (min-width: 1024px) {
            .messages {
                padding: 1.6rem 2.4rem 0.4rem;
            }
            .input-area {
                padding: 0.8rem 2.4rem 1.2rem;
            }
            header {
                padding: 0.6rem 2.4rem;
            }
            .settings-panel {
                margin: 0 2.4rem;
            }
            .settings-panel.open {
                margin: 0 2.4rem 0.8rem;
            }
            .msg {
                max-width: 72%;
            }
            .welcome {
                max-width: 520px;
            }
        }

        @media (max-width: 768px) {
            header {
                padding: 0.45rem 0.8rem;
                min-height: 52px;
            }
            .logo-img {
                width: 32px;
                height: 32px;
            }
            .logo-text {
                font-size: var(--text-base);
            }
            .logo-text small {
                font-size: var(--text-xs);
            }
            .icon-btn {
                width: 34px;
                height: 34px;
                min-width: 34px;
                font-size: var(--text-base);
            }
            .settings-panel {
                margin: 0 0.5rem;
            }
            .settings-panel.open {
                padding: 0.9rem 1rem 1rem;
                margin: 0 0.5rem 0.5rem;
            }
            .settings-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.6rem 0.8rem;
            }
            .messages {
                padding: 0.9rem 0.8rem 0.3rem;
                gap: 0.7rem;
            }
            .msg {
                max-width: 88%;
            }
            .msg .bubble {
                font-size: var(--text-sm);
                padding: 9px 14px;
            }
            .input-area {
                padding: 0.5rem 0.8rem 0.7rem;
            }
            .input-form {
                padding: 3px 3px 3px 12px;
            }
            .input-form textarea {
                font-size: var(--text-sm);
            }
            .send-btn {
                width: 38px;
                height: 38px;
                min-width: 38px;
                font-size: var(--text-base);
            }
            .toasts {
                top: 62px;
                right: 8px;
                max-width: 260px;
            }
            .toast {
                font-size: var(--text-xs);
                padding: 8px 13px;
            }
            .input-meta .kbd {
                display: none;
            }
            .slider-row {
                flex-direction: column;
                gap: 0.4rem;
            }
            .slider-group {
                min-width: 100%;
            }
        }

        @media (max-width: 600px) {
            .settings-grid {
                grid-template-columns: 1fr;
                gap: 0.5rem;
            }
            .settings-panel.open {
                padding: 0.7rem 0.8rem 0.9rem;
            }
            .settings-actions {
                flex-wrap: wrap;
            }
            .status-badge {
                font-size: var(--text-xs);
                padding: 4px 10px;
            }
            .btn {
                font-size: var(--text-xs);
                padding: 7px 12px;
                min-height: 34px;
            }
            .btn-sm {
                font-size: var(--text-xs);
                padding: 4px 8px;
                min-height: 26px;
            }
        }

        @media (max-width: 480px) {
            .msg {
                max-width: 94%;
            }
            .welcome .icon-orb {
                width: 58px;
                height: 58px;
                font-size: 1.5rem;
            }
            .welcome h2 {
                font-size: var(--text-xl);
            }
            .welcome p {
                font-size: var(--text-sm);
            }
            .chip {
                font-size: var(--text-xs);
                padding: 5px 11px;
            }
            .input-form {
                padding: 2px 2px 2px 10px;
                border-radius: var(--radius-md);
            }
            .send-btn {
                width: 34px;
                height: 34px;
                min-width: 34px;
                border-radius: var(--radius-sm);
            }
            .msg .bubble {
                font-size: var(--text-sm);
                padding: 8px 12px;
            }
            .msg .avatar {
                width: 26px;
                height: 26px;
                min-width: 26px;
                font-size: var(--text-xs);
            }
            header {
                padding: 0.35rem 0.6rem;
                min-height: 46px;
            }
            .logo-img {
                width: 28px;
                height: 28px;
            }
            .logo-text {
                font-size: var(--text-sm);
            }
            .logo-text small {
                font-size: var(--text-xs);
            }
            .icon-btn {
                width: 30px;
                height: 30px;
                min-width: 30px;
                font-size: var(--text-sm);
            }
            .toasts {
                top: 56px;
                right: 6px;
                max-width: 220px;
            }
            .toast {
                font-size: var(--text-xs);
                padding: 6px 11px;
            }
            .settings-toggle {
                font-size: var(--text-xs);
                padding: 5px 8px;
            }
            .field input,
            .field select {
                font-size: var(--text-sm);
                padding: 7px 10px;
                min-height: 34px;
            }
            .field label {
                font-size: var(--text-xs);
            }
            .messages {
                padding: 0.6rem 0.6rem 0.2rem;
                gap: 0.6rem;
            }
            .input-area {
                padding: 0.4rem 0.6rem 0.6rem;
            }
            .jump-bottom {
                font-size: var(--text-xs);
                padding: 4px 12px;
                bottom: 12px;
            }
        }

        @media (max-width: 375px) {
            .logo-text small {
                display: none;
            }
            .logo-text {
                font-size: var(--text-sm);
            }
            .logo-img {
                width: 26px;
                height: 26px;
            }
            .header-actions {
                gap: 2px;
            }
            .icon-btn {
                width: 28px;
                height: 28px;
                min-width: 28px;
                font-size: var(--text-sm);
            }
            .settings-toggle {
                padding: 4px 6px;
                font-size: var(--text-xs);
            }
            .settings-panel.open {
                padding: 0.5rem 0.6rem 0.7rem;
            }
            .msg {
                max-width: 96%;
            }
            .msg .bubble {
                font-size: var(--text-sm);
                padding: 7px 10px;
            }
            .send-btn {
                width: 32px;
                height: 32px;
                min-width: 32px;
                font-size: var(--text-sm);
            }
            .input-form textarea {
                font-size: var(--text-sm);
                padding: 6px 0;
                min-height: 20px;
            }
            .input-form {
                padding: 2px 2px 2px 8px;
            }
        }

        @media (max-width: 320px) {
            .logo-text {
                font-size: var(--text-sm);
            }
            .logo-img {
                width: 22px;
                height: 22px;
            }
            .icon-btn {
                width: 26px;
                height: 26px;
                min-width: 26px;
                font-size: var(--text-sm);
            }
            header {
                padding: 0.25rem 0.4rem;
                min-height: 40px;
            }
            .settings-toggle {
                font-size: var(--text-xs);
                padding: 3px 5px;
            }
            .settings-panel.open {
                padding: 0.4rem 0.4rem 0.5rem;
                margin: 0 0.3rem 0.3rem;
            }
            .settings-grid {
                gap: 0.3rem;
            }
            .field input,
            .field select {
                font-size: var(--text-xs);
                padding: 5px 8px;
                min-height: 30px;
            }
            .field label {
                font-size: var(--text-xs);
            }
            .btn {
                font-size: var(--text-xs);
                padding: 5px 8px;
                min-height: 28px;
            }
            .msg .bubble {
                font-size: var(--text-xs);
                padding: 6px 9px;
            }
            .msg .avatar {
                width: 22px;
                height: 22px;
                min-width: 22px;
                font-size: var(--text-xs);
            }
            .messages {
                padding: 0.4rem 0.4rem 0.2rem;
                gap: 0.4rem;
            }
            .input-area {
                padding: 0.3rem 0.4rem 0.4rem;
            }
            .send-btn {
                width: 28px;
                height: 28px;
                min-width: 28px;
                font-size: var(--text-sm);
            }
            .input-form {
                padding: 2px 2px 2px 6px;
                gap: 4px;
            }
            .input-form textarea {
                font-size: var(--text-xs);
                padding: 4px 0;
                min-height: 18px;
            }
            .toasts {
                top: 48px;
                right: 4px;
                max-width: 180px;
            }
            .toast {
                font-size: var(--text-xs);
                padding: 5px 8px;
            }
            .input-meta {
                font-size: var(--text-xs);
            }
            .jump-bottom {
                font-size: var(--text-xs);
                padding: 3px 8px;
                bottom: 8px;
            }
        }

        @media (min-width: 820px) and (max-width: 1024px) {
            .msg {
                max-width: 78%;
            }
            .messages {
                padding: 1.2rem 1.8rem 0.4rem;
            }
            .input-area {
                padding: 0.6rem 1.8rem 0.9rem;
            }
            header {
                padding: 0.5rem 1.8rem;
            }
            .settings-panel {
                margin: 0 1.8rem;
            }
            .settings-panel.open {
                margin: 0 1.8rem 0.8rem;
            }
        }

        @media (min-width: 1280px) {
            .messages {
                padding: 2rem 3.2rem 0.6rem;
            }
            .input-area {
                padding: 0.8rem 3.2rem 1.4rem;
            }
            header {
                padding: 0.7rem 3.2rem;
            }
            .settings-panel {
                margin: 0 3.2rem;
            }
            .settings-panel.open {
                margin: 0 3.2rem 1rem;
            }
            .msg {
                max-width: 68%;
            }
            .welcome {
                max-width: 560px;
            }
            .welcome .icon-orb {
                width: 80px;
                height: 80px;
                font-size: 2.2rem;
            }
            .welcome h2 {
                font-size: var(--text-3xl);
            }
            .welcome p {
                font-size: var(--text-base);
            }
        }

        @media (min-width: 1600px) {
            .messages {
                padding: 2.4rem 4rem 0.6rem;
            }
            .input-area {
                padding: 1rem 4rem 1.6rem;
            }
            header {
                padding: 0.8rem 4rem;
            }
            .settings-panel {
                margin: 0 4rem;
            }
            .settings-panel.open {
                margin: 0 4rem 1.2rem;
            }
            .msg {
                max-width: 62%;
            }
        }

        @media (min-width: 1920px) {
            .messages {
                padding: 2.8rem 5rem 0.8rem;
            }
            .input-area {
                padding: 1.2rem 5rem 1.8rem;
            }
            header {
                padding: 0.9rem 5rem;
            }
            .settings-panel {
                margin: 0 5rem;
            }
            .settings-panel.open {
                margin: 0 5rem 1.4rem;
            }
            .msg {
                max-width: 56%;
            }
            .welcome {
                max-width: 640px;
            }
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible,
        [tabindex]:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        @media (prefers-reduced-motion: reduce) {
            .aurora {
                animation: none;
            }
            .welcome .icon-orb {
                animation: none;
            }
            .msg {
                animation: none;
                opacity: 1;
                transform: none;
            }
            .typing span {
                animation: none;
            }
            .status-badge .dot.on {
                animation: none;
            }
            .toast {
                animation: none;
                opacity: 1;
                transform: none;
            }
        }

        ::selection {
            background: var(--accent-subtle);
            color: var(--text-primary);
        }

        @media print {
            .aurora,
            .noise,
            .spotlight,
            .scroll-progress,
            .toasts,
            .jump-bottom,
            .drawer-overlay,
            .history-drawer {
                display: none !important;
            }
            header {
                position: static !important;
                background: #fff !important;
                border-bottom: 1px solid #ddd !important;
            }
            .glass,
            .glass-strong,
            .glass-card {
                background: #fff !important;
                backdrop-filter: none !important;
                -webkit-backdrop-filter: none !important;
                border: 1px solid #ddd !important;
                box-shadow: none !important;
            }
            body {
                background: #fff !important;
                color: #000 !important;
            }
            [data-theme="dark"] {
                --text-primary: #000 !important;
                --text-secondary: #222 !important;
                --text-tertiary: #444 !important;
            }
        }