*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }        :root {            --bg: #f9fafb;            --surface: #ffffff;            --surface-raised: #ffffff;            --border: rgba(0,0,0,0.08);            --border-strong: rgba(0,0,0,0.14);            --text-primary: #0d1117;            --text-secondary: #586069;            --text-muted: #8b949e;            --accent: #2563eb;            --accent-hover: #1d4ed8;            --accent-light: #eff6ff;            --accent-light-border: #bfdbfe;            --green: #059669;            --green-light: #ecfdf5;            --red: #dc2626;            --red-light: #fef2f2;            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);            --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.04);            --shadow-lg: 0 10px 32px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.04);            --radius-sm: 6px;            --radius: 10px;            --radius-lg: 14px;            --radius-xl: 20px;        }        html.dark {            --bg: #0d1117;            --surface: #161b22;            --surface-raised: #1c2128;            --border: rgba(255,255,255,0.06);            --border-strong: rgba(255,255,255,0.12);            --text-primary: #e6edf3;            --text-secondary: #8b949e;            --text-muted: #6e7681;            --accent: #3b82f6;            --accent-hover: #60a5fa;            --accent-light: rgba(59,130,246,0.08);            --accent-light-border: rgba(59,130,246,0.2);            --green: #10b981;            --green-light: rgba(16,185,129,0.08);            --red: #f87171;            --red-light: rgba(248,113,113,0.08);            --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);            --shadow-md: 0 4px 12px rgba(0,0,0,0.4), 0 1px 3px rgba(0,0,0,0.2);            --shadow-lg: 0 10px 32px rgba(0,0,0,0.5), 0 2px 8px rgba(0,0,0,0.2);        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text-primary); line-height: 1.6; min-height: 100vh; transition: background 0.2s, color 0.2s; -webkit-font-smoothing: antialiased; width: 100%; overflow-x: hidden; }

        /* ── Header ── */
        header { position: sticky; top: 0; z-index: 100; background: rgba(249,250,251,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 0px solid var(--border); transition: background 0.2s; }
        html.dark header { background: rgba(13,17,23,0.88); }
        .header-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; height: 65px; padding-top: 8px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
        .logo { display: flex; align-items: center; gap: 5px; text-decoration: none; }
        .logo-mark { width: 30px; height: 34px; flex-shrink: 0; position: relative; display: flex; align-items: center; justify-content: center; }
                .logo-mark::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--accent);
            border-radius: 0 0 0 0;
            clip-path: polygon(0% 0%, calc(100% - 8px) 0%, 100% 8px, 100% 100%, 0% 100%);
            z-index: 1; /* Sits below the inner SVG document lines */
        }

        /* 2. The Page Fold Flap (Stays assigned to the background boundary layer) */
        .logo-mark::after {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 8px;
            height: 8px;
            background: rgba(255, 255, 255, 0.4); 
            border-bottom-left-radius: 3px; 
            clip-path: polygon(0 0, 100% 100%, 0 100%);
            z-index: 2;
        }

        .logo-mark svg { display: block; z-index: 3;}
        .logo-dot { position: absolute; bottom: -2px; right: -2px; width: 10px; height: 10px; background-color: #3fb950; border-radius: 50%; border: 2px solid var(--surface); z-index: 4; transition: background-color 0.3s ease;}
        .logo-dot.is-offline {
            background-color: #f85149; /* Bright red color matching modern UI kits */
        }        
        .logo-text { line-height: 1.2; }
        .logo-name { font-size: 30px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; }
        .logo-name span { color: var(--accent); font-weight: 700; }
        .logo-sub { font-size: 10px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); font-family: 'SF Mono', 'Fira Code', monospace; }
        nav { display: flex; align-items: center; gap: 4px; }
        .hamburger-btn { margin-left: auto; }
        .hamburger-btn { display: none; width: 34px; height: 34px; border-radius: var(--radius-sm); border: none; background: transparent; color: var(--text-primary); cursor: pointer; align-items: center; justify-content: center; transition: background 0.15s, color 0.15s; }
        .hamburger-btn:hover { background: var(--border); }
        .hamburger-btn svg { transition: transform 0.2s; }
        .nav-scrim { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 199; opacity: 0; transition: opacity 0.25s ease; }
        .nav-scrim.open { opacity: 1; }
        .nav-drawer { display: none; }
        body.drawer-open { overflow: hidden; }
        .nav-link { font-size: 13px; font-weight: 500; color: var(--text-secondary); text-decoration: none; padding: 6px 12px; border-radius: var(--radius-sm); transition: color 0.15s, background 0.15s; }
        .nav-link:hover { color: var(--text-primary); background: var(--border); }
        .nav-dropdown { position: relative; }
        .nav-dropdown-btn { font-size: 13px; font-weight: 600; color: var(--text-secondary); padding: 8px 14px; border-radius: var(--radius-sm); border: none; background: none; cursor: pointer; display: flex; align-items: center; gap: 6px; transition: color 0.15s, background 0.15s; }
        /* Fix navigation stretching on mobile screens */
        @media (max-width: 600px) {
            .header-inner {
                padding: 0 12px; /* Reduce side padding of header */
                gap: 8px;        /* Bring logo and navigation closer */
            }
            .logo-name {
                font-size: 20px; /* Marginally scale down logo text size on phones */
            }

            /* Hide the entire desktop nav, show the hamburger instead */
            nav { display: none; }
            .hamburger-btn { display: flex; margin-left: auto; }

            .nav-scrim { display: block; pointer-events: none; }
            .nav-scrim.open { pointer-events: auto; }

            /* Full-height drawer sliding from the right */
            .nav-drawer {
                position: fixed;
                top: 0;
                right: 0;
                bottom: 0;
                width: min(82vw, 320px);
                max-width: 100vw;
                box-sizing: border-box;
                background: var(--surface);
                border-left: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                z-index: 200;
                display: flex;
                flex-direction: column;
                gap: 4px;
                padding: 20px 16px;
                transform: translateX(100%);
                transition: transform 0.3s ease;
                overflow-y: auto;
                overflow-x: hidden;
            }
            .nav-drawer.open { transform: translateX(0); }

            .nav-drawer-close {
                align-self: flex-end;
                width: 32px;
                height: 32px;
                border: none;
                background: transparent;
                border-radius: 50%;
                cursor: pointer;
                display: flex;
                align-items: center;
                justify-content: center;
                margin-bottom: 8px;
                transition: background 0.15s;
            }
            .nav-drawer-close:hover { background: var(--border); }

            .nav-drawer .nav-link,
            .nav-drawer .theme-btn-mobile {
                width: 100%;
                justify-content: flex-start;
                padding: 12px 10px;
                border-radius: var(--radius-sm);
                font-size: 14px;
            }
            .theme-btn-mobile {
                display: flex;
                align-items: center;
                gap: 10px;
                background: none;
                border: none;
                color: var(--text-secondary);
                cursor: pointer;
                width: 100%;
                text-align: left;
                transition: background 0.15s;
            }
            .theme-btn-mobile:hover { background: var(--border); }

            /* Mobile dropdown becomes an accordion inside the drawer */
            .nav-drawer .nav-dropdown-btn {
                width: 100%;
                justify-content: space-between;
                padding: 12px 10px;
            }
            .nav-drawer .dropdown-menu {
                position: static;
                left: auto;
                display: none;
                grid-template-columns: 1fr;
                min-width: 0;
                width: 100%;
                border: none;
                box-shadow: none;
                background: var(--bg);
                border-radius: var(--radius);
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
                transform: none;
                padding: 8px;
                margin-top: 4px;
            }
            .nav-drawer .dropdown-menu.open {
                display: grid;
                transform: none;
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
            }
            .nav-drawer .dropdown-column + .dropdown-column {
                margin-top: 6px;
            }
        }


        .nav-dropdown-btn:hover { color: var(--text-primary); background: var(--border); }
        .nav-dropdown-btn svg { transition: transform 0.2s; }
        .nav-dropdown-btn.open svg { transform: rotate(180deg); }
        .dropdown-menu {
            position: absolute;
            top: calc(100% + 10px);
            left: 50%;
            min-width: 460px;
            max-width: min(460px, 92vw);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4px;
            background: var(--surface-raised);
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            padding: 10px;
            overflow: hidden;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transform: translate(-50%, -8px);
            transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
            z-index: 50;
        }
        .dropdown-menu.open {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translate(-50%, 0);
        }
        .dropdown-column { display: flex; flex-direction: column; gap: 2px; }
        .dropdown-column-title { font-size: 11px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-muted); padding: 6px 10px 8px; }
        .dropdown-item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; text-decoration: none; font-size: 13px; font-weight: 500; color: var(--text-primary); border-radius: var(--radius-sm); transition: background 0.12s; }
        .dropdown-item:hover { background: var(--bg); }
        .dropdown-icon { width: 28px; height: 28px; border-radius: var(--radius-sm); background: var(--accent-light); display: flex; align-items: center; justify-content: center; font-size: 14px; flex-shrink: 0; }
        .theme-btn { width: 34px; height: 34px; border-radius: var(--radius-sm); border: none; background: transparent; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 16px; transition: background 0.15s, border-color 0.15s; }
        .theme-btn:hover { background: var(--bg); }
        .nav-divider { width: 1px; height: 20px; background: var(--border-strong); margin: 0 4px; }

        /* ── Main ── */
        main { max-width: 1100px; margin: 0 auto; padding: 80px 24px 80px; }
        .hero { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; margin-bottom: 100px; }
        @media (max-width: 800px) { .hero { grid-template-columns: 1fr; gap: 48px; margin-bottom: 64px; } }
        .hero-eyebrow { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-light); border: 1px solid var(--accent-light-border); border-radius: 20px; padding: 4px 12px; font-size: 11.5px; font-weight: 600; color: var(--accent); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 20px; }
        .hero-eyebrow::before { content: ''; width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }
        .hero-title { font-size: clamp(32px, 5vw, 52px); font-weight: 800; letter-spacing: -0.035em; line-height: 1.1; color: var(--text-primary); margin-bottom: 16px; }
        .hero-title em { font-style: normal; color: var(--accent); }
        .hero-desc { font-size: 15.5px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 32px; max-width: 420px; }
        .hero-features { display: flex; flex-direction: column; gap: 12px; }
        .hero-feature { display: flex; align-items: center; gap: 10px; font-size: 13.5px; font-weight: 500; color: var(--text-secondary); }
        .check-icon { width: 20px; height: 20px; border-radius: 50%; background: var(--green-light); border: 1px solid rgba(5,150,105,0.2); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
        html.dark .check-icon { border-color: rgba(16,185,129,0.2); }
        .check-icon svg { display: block; }

        /* ── Upload Card ── */
        .upload-card { background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-xl); padding: 28px; box-shadow: var(--shadow-md); position: relative; }
        .upload-card.drag-over { outline: 2px dashed var(--accent); outline-offset: -2px; }
        .drop-zone { border: 1.5px dashed var(--border-strong); border-radius: var(--radius-lg); padding: 36px 24px; display: flex; flex-direction: column; align-items: center; text-align: center; transition: border-color 0.2s, background 0.2s; cursor: pointer; }
        .drop-zone:hover, .upload-card.drag-over .drop-zone { border-color: var(--accent); background: var(--accent-light); }
        .drop-icon { width: 52px; height: 64px; margin-bottom: 18px; position: relative; }
        .drop-icon-file { width: 44px; height: 56px; background: var(--surface-raised); border: 1.5px solid var(--border-strong); border-radius: var(--radius-sm); position: relative; display: flex; align-items: flex-end; padding: 5px; box-shadow: var(--shadow-sm); }
        .img-badge { background: #7c3aed; color: white; font-size: 9px; font-weight: 800; letter-spacing: 0.08em; padding: 2px 5px; border-radius: 3px; width: 100%; text-align: center; font-family: 'SF Mono', monospace; }
        .drop-title { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
        .drop-sub { font-size: 12.5px; color: var(--text-muted); margin-bottom: 18px; }
        .btn-upload { display: inline-flex; align-items: center; gap: 6px; background: var(--accent); color: white; font-size: 12.5px; font-weight: 600; padding: 9px 18px; border-radius: var(--radius-sm); border: none; cursor: pointer; letter-spacing: 0.02em; transition: background 0.15s, transform 0.1s; text-decoration: none; }
        .btn-upload:hover { background: var(--accent-hover); }

        /* Status */
        .status-bar { border-radius: var(--radius-sm); padding: 10px 14px; font-size: 12.5px; font-weight: 500; margin-bottom: 14px; display: none; }
        .status-bar.info { background: var(--accent-light); color: var(--accent); border: 1px solid var(--accent-light-border); display: block; }
        .status-bar.success { background: var(--green-light); color: var(--green); border: 1px solid rgba(5,150,105,0.2); display: block; }
        .status-bar.error { background: var(--red-light); color: var(--red); border: 1px solid rgba(220,38,38,0.15); display: block; }

        /* File list */
        .file-list { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
        .file-item { display: flex; align-items: center; gap: 10px; padding: 9px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 12.5px; cursor: grab; transition: box-shadow 0.15s, opacity 0.15s; user-select: none; }
        .file-item.dragging { opacity: 0.4; }
        .file-item.drag-target { box-shadow: 0 0 0 2px var(--accent); }
        .file-item-drag { color: var(--text-muted); cursor: grab; flex-shrink: 0; display: flex; align-items: center; }
        .file-item-icon { width: 28px; height: 28px; background: rgba(124,58,237,0.1); border-radius: 5px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
        .file-item-thumb { width: 28px; height: 28px; border-radius: 5px; object-fit: cover; flex-shrink: 0; border: 1px solid var(--border); }
        .file-item-name { flex: 1; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .file-item-size { font-size: 11px; color: var(--text-muted); font-family: 'SF Mono', monospace; flex-shrink: 0; }
        .file-item-remove { width: 20px; height: 20px; border-radius: 50%; border: none; background: none; cursor: pointer; color: var(--text-muted); display: flex; align-items: center; justify-content: center; transition: color 0.15s, background 0.15s; flex-shrink: 0; font-size: 14px; line-height: 1; }
        .file-item-remove:hover { color: var(--red); background: var(--red-light); }

        /* Page size selector */
        .options-wrap { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; text-align: left; }
        .opt-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
        .opt-label { font-size: 13px; font-weight: 600; color: var(--text-secondary); }
        .opt-select { font-size: 12.5px; font-weight: 500; color: var(--text-primary); background: var(--bg); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: 6px 10px; cursor: pointer; outline: none; }
        .opt-select:focus { border-color: var(--accent); }
        .add-more-btn { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 600; color: var(--accent); background: var(--accent-light); border: 1px solid var(--accent-light-border); border-radius: var(--radius-sm); padding: 5px 12px; cursor: pointer; transition: opacity 0.15s; }
        .add-more-btn:hover { opacity: 0.8; }
        .drag-hint { font-size: 11.5px; color: var(--text-muted); text-align: center; margin-top: 4px; }

        /* Action button */
        .btn-action { width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px; background: var(--text-primary); color: var(--surface); font-size: 13px; font-weight: 600; padding: 12px; border-radius: var(--radius-sm); border: none; cursor: pointer; letter-spacing: 0.01em; transition: opacity 0.15s, transform 0.1s; margin-top: 14px; }
        .btn-action:hover { opacity: 0.88; }
        .btn-action:active { transform: scale(0.99); }
        .btn-action:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

        /* ── Features Section ── */
        .scroll-cue { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-top: 64px; margin-bottom: 0; }
        .scroll-cue-label { font-size: 11px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); }
        .scroll-cue-arrow { color: var(--text-muted); animation: bounce 2s ease-in-out infinite; }
        @keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }
        .features-section { border-top: 1px solid var(--border); padding-top: 80px; scroll-margin-top: 80px; }
        .features-label { font-size: 11.5px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
        .features-title { font-size: clamp(22px, 3vw, 32px); font-weight: 800; letter-spacing: -0.03em; color: var(--text-primary); margin-bottom: 48px; }
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        @media (max-width: 700px) { .features-grid { grid-template-columns: 1fr; } }
        .feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; transition: border-color 0.2s, box-shadow 0.2s; }
        .feature-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); }
        .feature-num { font-size: 11px; font-weight: 700; font-family: 'SF Mono', monospace; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 14px; }
        .feature-icon { width: 38px; height: 38px; border-radius: var(--radius-sm); background: var(--accent-light); display: flex; align-items: center; justify-content: center; margin-bottom: 14px; }
        .feature-h { font-size: 14.5px; font-weight: 700; letter-spacing: -0.01em; color: var(--text-primary); margin-bottom: 8px; }
        .feature-p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

        /* ── Footer ── */
        footer { border-top: 1px solid var(--border); background: var(--surface); padding: 28px 24px; margin-top: 80px; }
        .footer-inner { max-width: 1100px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
        .footer-copy { font-size: 12.5px; color: var(--text-muted); }
        .footer-links { display: flex; align-items: center; gap: 20px; }
        .footer-link { font-size: 12.5px; font-weight: 500; color: var(--text-muted); text-decoration: none; transition: color 0.15s; }
        .footer-link:hover { color: var(--text-primary); }
        
        
        /* ── scroll control ── */
        .scroll-arrow-link{
            display:inline-flex;
            cursor:pointer;
            color:inherit;
            text-decoration:none;
        }

        .scroll-arrow-link:hover .scroll-cue-arrow{
            transform:translateY(4px);
            color:var(--accent);
        }

        .scroll-cue-arrow{
            transition:transform .2s,color .2s;
        }



        /* Language Popover */
        .lang-box { position: relative; display: inline-block; }
        .lang-trigger { font-size: 12px; font-weight: 500; color: var(--text-muted); background: none; border: 1px solid var(--border-strong); padding: 5px 10px; border-radius: var(--radius-sm); cursor: pointer; display: flex; align-items: center; gap: 4px; }
        .lang-trigger:hover { color: var(--text-primary); background: var(--bg); }
        .lang-popover { position: absolute; bottom: calc(100% + 6px); right: 0; min-width: 130px; background: var(--surface-raised); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); box-shadow: var(--shadow-lg); overflow: hidden; opacity: 0; visibility: hidden; transform: translateY(4px); transition: all 0.15s; z-index: 150; }
        .lang-popover.open { opacity: 1; visibility: visible; transform: translateY(0); }
        .lang-option { width: 100%; background: none; border: none; display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; font-size: 12.5px; color: var(--text-primary); cursor: pointer; text-align: left; }
        .lang-option:hover { background: var(--bg); }
        .lang-option.selected { color: var(--accent); font-weight: 600; }

        /* Clear Workspace button */
        .btn-clear {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            background: transparent;
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 500;
            padding: 8px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-strong);
            cursor: pointer;
            letter-spacing: 0.01em;
            transition: background 0.15s, color 0.15s;
            margin-top: 8px;
        }
        .btn-clear:hover { background: var(--red-light); color: var(--red); border-color: rgba(220,38,38,0.2); }

        /* Remove file button */
        .file-item-remove {
            width: 22px;
            height: 22px;
            border-radius: 4px;
            border: 1px solid var(--border);
            background: transparent;
            color: var(--text-muted);
            font-size: 11px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: background 0.12s, color 0.12s;
        }
        .file-item-remove:hover { background: var(--red-light); color: var(--red); border-color: rgba(220,38,38,0.2); }