/* === Variabel CSS === */
        :root {
            --bg: #0b1020;
            --card: #11162b;
            --muted: #94a3b8;
            --text: #e6edf3;
            --accent: #38bdf8;
            --accent2: #a5f3fc;
            --danger: #fca5a5;
            --warn: #fde68a;
            --ok: #86efac;
            --shadow: 0 10px 30px rgba(0,0,0,.4);
            --radius: 16px;
            --radius-lg: 22px;
            --maxw: 1100px;
        }

        .light-theme {
            --bg: #f0f4f8;
            --card: #ffffff;
            --muted: #64748b;
            --text: #1e293b;
            --accent: #0ea5e9;
            --accent2: #38bdf8;
            --danger: #ef4444;
            --warn: #f59e0b;
            --ok: #22c55e;
            --shadow: 0 10px 30px rgba(0,0,0,.1);
        }
        .light-theme .hero .card { background: radial-gradient(1200px 400px at -10% -20%, rgba(56,189,248,.1), transparent), var(--card); }
        .light-theme .btn.primary { color: #ffffff; }

        /* === Gaya Umum === */
        * { box-sizing: border-box; }
        html, body {
            margin: 0;
            padding: 0;
            background: var(--bg);
            color: var(--text);
            font: 15px/1.6 system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
            transition: background-color .3s, color .3s;
        }
        a { color: inherit; text-decoration: none; }
        .container { max-width: var(--maxw); margin: 0 auto; padding: 24px; }

        /* === Header === */
        header {
            position: sticky;
            top: 0;
            backdrop-filter: saturate(140%) blur(8px);
            background: rgba(10,14,30,.7);
            border-bottom: 1px solid rgba(255,255,255,.06);
            z-index: 50;
            transition: background-color .3s, border-color .3s;
        }
        .light-theme header { background: rgba(255,255,255,.7); border-bottom: 1px solid rgba(0,0,0,.06); }
        .nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
        .nav a {
            padding: 10px 12px;
            border-radius: 10px;
            color: var(--muted);
            text-decoration: none;
            transition: background-color .2s, color .2s;
        }
        .nav a:hover, .nav a.active { color: var(--text); background: rgba(255,255,255,.06); }
        .light-theme .nav a:hover, .light-theme .nav a.active { background: rgba(0,0,0,.06); }
        .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
        .brand span { font-size: 18px; }
        .badge {
            font-size: 12px;
            color: #0a0f1f;
            background: linear-gradient(90deg, var(--accent), var(--accent2));
            padding: 6px 10px;
            border-radius: 999px;
            font-weight: 700;
            box-shadow: var(--shadow);
        }

        /* === Toggle Tema === */
        .theme-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: transparent;
            border: 1px solid rgba(255,255,255,.1);
            color: var(--muted);
            cursor: pointer;
            transition: background-color .2s, border-color .2s, color .2s;
        }
        .light-theme .theme-toggle { border-color: rgba(0,0,0,.1); }
        .theme-toggle:hover { background: rgba(255,255,255,.1); }
        .light-theme .theme-toggle:hover { background: rgba(0,0,0,.1); }
        .theme-toggle svg { width: 22px; height: 22px; }

        /* === Hero === */
        .hero {
            display: grid;
            grid-template-columns: 1.2fr .8fr;
            gap: 22px;
            align-items: center;
            padding: 34px 0;
        }
        .hero .card {
            background: radial-gradient(1200px 400px at -10% -20%, rgba(56,189,248,.25), transparent), var(--card);
            padding: 24px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid rgba(255,255,255,.06);
            transition: background-color .3s, border-color .3s, box-shadow .3s;
        }
        .light-theme .hero .card { border-color: rgba(0,0,0,.06); }
        h1 { font-size: 38px; line-height: 1.15; margin: 10px 0 6px; }
        .lead { color: var(--muted); font-size: 17px; }
        .cta { display: flex; gap: 12px; margin-top: 16px; }
        .btn {
            appearance: none;
            border: 0;
            border-radius: 14px;
            padding: 12px 16px;
            font-weight: 700;
            cursor: pointer;
            transition: background-color .2s, color .2s, border-color .2s;
        }
        .btn.primary { background: linear-gradient(90deg, var(--accent), var(--accent2)); color: #0d1226; }
        .btn.ghost { background: rgba(255,255,255,.06); color: var(--text); border: 1px solid rgba(255,255,255,.08); }
        .light-theme .btn.ghost { background: rgba(0,0,0,.06); border: 1px solid rgba(0,0,0,.08); }
        .hint { display: flex; align-items: center; gap: 8px; margin-top: 10px; color: var(--muted); font-size: 13px; }

        /* === Sections === */
        section { padding: 30px 0; }
        h2 { font-size: 26px; margin: 0 0 10px; }
        p { margin: 6px 0; }
        .grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 14px; }
        .card {
            background: var(--card);
            padding: 18px;
            border-radius: var(--radius);
            border: 1px solid rgba(255,255,255,.06);
            transition: background-color .3s, border-color .3s, box-shadow .3s;
            display: block;
        }
        .card:hover {
            box-shadow: 0 15px 40px rgba(0,0,0,.6);
            transform: translateY(-5px);
            transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
        }
        .light-theme .card { border-color: rgba(0,0,0,.06); }
        .shadow { box-shadow: var(--shadow); }

        /* === Features === */
        .features .item { grid-column: span 4; }
        .features .item .title { font-weight: 800; margin-bottom: 6px; }
        .features .item .icon {
            font-size: 2.5rem;
            line-height: 1;
            margin-bottom: 12px;
            color: var(--accent);
        }

        /* === Demo === */
        .demo-container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .upload-area {
            border: 2px dashed var(--muted);
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            cursor: pointer;
            width: 100%;
            max-width: 500px;
            transition: all 0.2s ease-in-out;
        }
        .upload-area:hover {
            border-color: var(--accent);
            color: var(--accent);
        }
        .upload-area.active {
            border-color: var(--accent);
            background-color: rgba(56,189,248, 0.05);
        }
        .upload-area input { display: none; }
        .upload-text {
            color: var(--muted);
            margin-top: 8px;
        }
        .upload-area.active .upload-text {
            color: var(--accent);
        }
        .demo-options {
            display: flex;
            gap: 16px;
            margin-top: 20px;
        }
        .demo-options button {
            border: 1px solid var(--muted);
            background: transparent;
            padding: 8px 16px;
            border-radius: 999px;
            color: var(--muted);
            cursor: pointer;
            transition: all 0.2s;
        }
        .demo-options button:hover {
            background: var(--accent);
            color: #0d1226;
            border-color: var(--accent);
        }
        .demo-options button.active {
            background: var(--accent);
            color: #0d1226;
            border-color: var(--accent);
        }
        .loader {
            border: 4px solid var(--muted);
            border-top: 4px solid var(--accent);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 20px auto;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
            font-size: 14px;
        }
        .data-table th, .data-table td {
            border: 1px solid rgba(255,255,255,.1);
            padding: 12px;
            text-align: left;
        }
        .light-theme .data-table th, .light-theme .data-table td { border-color: rgba(0,0,0,.1); }
        .data-table th {
            background: rgba(255,255,255,.05);
            font-weight: 600;
            color: var(--text);
        }
        .light-theme .data-table th { background: rgba(0,0,0,.05); }
        .data-table tfoot td {
            font-weight: 700;
            color: var(--accent);
            background: rgba(56,189,248, 0.05);
        }
        .light-theme .data-table tfoot td {
            background: rgba(56,189,248, 0.15);
        }
        .text-center { text-align: center; }
        .error-message { color: var(--danger); font-size: 12px; margin-top: 4px; }
        .highlight-error { color: var(--danger); font-weight: 600; }
        .highlight-ok { color: var(--ok); font-weight: 600; }

        /* === Pricing === */
        .pricing .col { grid-column: span 12; max-width: 500px; margin: auto;}
        .price { font-size: 22px; font-weight: 900; }
        .pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 10px;
            border-radius: 999px;
            background: rgba(255,255,255,.06);
            border: 1px solid rgba(255,255,255,.08);
            font-size: 12px;
            transition: background-color .3s, border-color .3s;
        }
        .light-theme .pill { background: rgba(0,0,0,.06); border-color: rgba(0,0,0,.08); }

        /* === FAQ === */
        details {
            background: var(--card);
            border: 1px solid rgba(255,255,255,.06);
            border-radius: 12px;
            padding: 12px;
            transition: background-color .3s, border-color .3s;
        }
        .light-theme details { border-color: rgba(0,0,0,.06); }
        details + details { margin-top: 10px; }
        summary { cursor: pointer; font-weight: 800; }

        /* === Footer === */
        footer { padding: 30px 0; color: var(--muted); transition: color .3s; }
        .footgrid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 18px; }

        /* === Responsive === */
        @media (max-width: 920px) {
            .hero { grid-template-columns: 1fr; }
            .features .item, .pricing .col { grid-column: span 12; }
            .compare { grid-template-columns: 1fr; }
            .stats { grid-template-columns: repeat(2, 1fr); }
            .footgrid { grid-template-columns: 1fr; }
            .btn { padding: 10px 14px; font-size: 14px; }
            h1 { font-size: 32px; }
            h2 { font-size: 24px; }
            .lead { font-size: 16px; }
            .nav nav { display: none; }
            .nav-toggle { display: block; background: none; border: none; color: var(--text); cursor: pointer; font-size: 24px; padding: 0; }
        }

        @media (min-width: 921px) {
            .nav-toggle { display: none; }
        }

        @media (max-width: 600px) {
            .container { padding: 16px; }
            .hero { padding: 20px 0; }
            .hero .card { padding: 16px; }
            h1 { font-size: 28px; }
            h2 { font-size: 22px; }
            .lead { font-size: 15px; }
            .btn { padding: 8px 12px; font-size: 13px; }
            .stats { grid-template-columns: 1fr; }
            .data-table th, .data-table td { padding: 8px; font-size: 12px; }
        }