/* ===== RESET & BASE ===== */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Inter', sans-serif;
            background: var(--bg);
            color: var(--text);
            transition: background 0.3s, color 0.3s;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== THEMES ===== */
        :root {
            --bg: #e8ecf0;
            --bg-card: #ffffff;
            --bg-header: #ffffff;
            --bg-code: #f0f2f5;
            --text: #1a1a2e;
            --text-secondary: #4a4a5e;
            --text-muted: #7a7a8e;
            --border: #d0d5dd;
            --shadow: 0 4px 16px rgba(0,0,0,0.06);
            --shadow-hover: 0 8px 28px rgba(0,0,0,0.10);
            --primary: #1e3a5f;
            --primary-hover: #2b4c7a;
            --primary-light: #e8edf4;
            --accent: #d97a2b;
            --accent-hover: #c06a20;
            --toggle-bg: #c0c6d0;
            --toggle-dot: #ffffff;
            --footer-bg: #ffffff;
        }
        [data-theme="dark"] {
            --bg: #14141f;
            --bg-card: #1e1e32;
            --bg-header: #1a1a2e;
            --bg-code: #2a2a42;
            --text: #eaeef2;
            --text-secondary: #a0aec0;
            --text-muted: #7a8a9e;
            --border: #2d3748;
            --shadow: 0 4px 16px rgba(0,0,0,0.4);
            --shadow-hover: 0 8px 28px rgba(0,0,0,0.6);
            --primary: #7ba3d4;
            --primary-hover: #9abce8;
            --primary-light: #2a3a52;
            --accent: #f0a040;
            --accent-hover: #e09030;
            --toggle-bg: #4a4a6a;
            --toggle-dot: #2d2d44;
            --footer-bg: #1a1a2e;
        }

        /* ===== HEADER ===== */
        header {
            background: var(--bg-header);
            border-bottom: 1px solid var(--border);
            padding: 14px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            transition: background 0.3s, border 0.3s;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(4px);
        }
        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.5px;
            text-decoration: none;
        }
        .logo span { color: var(--accent); }

        .nav {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .nav a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 14px;
            transition: color 0.2s;
            padding: 4px 0;
        }
        .nav a:hover { color: var(--primary); }
        .nav a.order-btn {
            background: var(--accent);
            color: #fff;
            padding: 6px 18px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 13px;
            transition: background 0.2s;
        }
        .nav a.order-btn:hover {
            background: var(--accent-hover);
            color: #fff;
        }

        .theme-toggle-wrap {
            display: flex;
            align-items: center;
            height: 100%;
        }
        .theme-toggle {
            background: var(--toggle-bg);
            border: none;
            border-radius: 30px;
            width: 50px;
            height: 28px;
            cursor: pointer;
            position: relative;
            transition: background 0.3s;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            padding: 0;
        }
        .theme-toggle::after {
            content: '';
            position: absolute;
            top: 3px;
            left: 3px;
            width: 22px;
            height: 22px;
            background: var(--toggle-dot);
            border-radius: 50%;
            transition: transform 0.3s, background 0.3s;
            box-shadow: 0 2px 6px rgba(0,0,0,0.2);
        }
        [data-theme="dark"] .theme-toggle::after {
            transform: translateX(22px);
        }
        .theme-toggle svg {
            position: absolute;
            width: 14px;
            height: 14px;
            top: 7px;
            z-index: 1;
            pointer-events: none;
            opacity: 0.6;
        }
        .theme-toggle .sun { left: 6px; }
        .theme-toggle .moon { right: 6px; }
        [data-theme="dark"] .theme-toggle .sun { opacity: 0.3; }
        [data-theme="dark"] .theme-toggle .moon { opacity: 0.9; }
        [data-theme="light"] .theme-toggle .sun { opacity: 0.9; }
        [data-theme="light"] .theme-toggle .moon { opacity: 0.3; }

        /* ===== CONTAINER ===== */
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 32px 24px;
            flex: 1;
            width: 100%;
        }

        .page-home { display: block; }
        .page-demo { display: none; }

        .page-title {
            font-size: 30px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .page-sub {
            color: var(--text-secondary);
            margin-bottom: 28px;
            font-size: 16px;
        }

        .filters {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 30px;
        }
        .filters button {
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            cursor: pointer;
            transition: 0.2s;
        }
        .filters button:hover,
        .filters button.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 20px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 20px 18px 16px;
            transition: transform 0.2s, box-shadow 0.2s, background 0.3s, border 0.3s;
            box-shadow: var(--shadow);
            text-decoration: none;
            color: var(--text);
            display: flex;
            flex-direction: column;
            cursor: pointer;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .card .thumb {
            width: 100%;
            height: 120px;
            background: var(--bg-code);
            border-radius: 12px;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 52px;
            transition: transform 0.2s, background 0.3s;
        }
        .card:hover .thumb {
            transform: scale(1.03);
        }
        .card h3 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 4px;
            line-height: 1.3;
        }
        .card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.4;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card .badge {
            margin-top: 10px;
            font-size: 10px;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-light);
            padding: 2px 12px;
            border-radius: 20px;
            align-self: flex-start;
            transition: background 0.3s, color 0.3s;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        /* ===== СТРАНИЦА ДЕМО ===== */
        .demo-back {
            display: inline-block;
            margin-bottom: 20px;
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
        }
        .demo-back:hover { color: var(--primary); }

        .demo-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 32px 32px 28px;
            box-shadow: var(--shadow);
            transition: background 0.3s, border 0.3s;
        }
        .demo-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 12px;
        }
        .demo-title {
            font-size: 26px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .demo-title .emoji-big {
            font-size: 40px;
            line-height: 1;
        }
        .demo-order-btn {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 10px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: background 0.2s;
            text-decoration: none;
            display: inline-block;
            white-space: nowrap;
        }
        .demo-order-btn:hover {
            background: var(--accent-hover);
        }

        .demo-desc-block {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            margin-bottom: 20px;
            padding: 14px 20px;
            background: var(--bg-code);
            border-radius: 12px;
            border-left: 4px solid var(--accent);
            transition: background 0.3s, border-color 0.3s;
        }
        .demo-desc-block strong {
            color: var(--text);
        }

        .calculator-demo {
            background: var(--bg-code);
            border-radius: 14px;
            padding: 24px 24px;
            margin: 12px 0 24px;
            transition: background 0.3s;
        }
        .calc-row {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 12px;
            align-items: center;
        }
        .calc-row label {
            flex: 0 0 140px;
            font-weight: 500;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .calc-row input {
            flex: 1;
            min-width: 130px;
            padding: 9px 14px;
            border: 1px solid var(--border);
            border-radius: 10px;
            background: var(--bg);
            color: var(--text);
            font-size: 15px;
            transition: border 0.2s, background 0.3s, color 0.3s;
        }
        .calc-row input:focus {
            outline: none;
            border-color: var(--primary);
        }
        .calc-result {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin-top: 2px;
        }
        .calc-btn {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 9px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: background 0.2s;
            margin-top: 4px;
        }
        .calc-btn:hover { background: var(--primary-hover); }

        .embed-box {
            margin-top: 24px;
            border-top: 1px solid var(--border);
            padding-top: 20px;
        }
        .embed-box h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .embed-box textarea {
            width: 100%;
            padding: 12px 16px;
            background: var(--bg-code);
            border: 1px solid var(--border);
            border-radius: 12px;
            color: var(--text);
            font-size: 12px;
            font-family: 'Inter', monospace;
            resize: vertical;
            min-height: 80px;
            transition: background 0.3s, border 0.3s, color 0.3s;
            line-height: 1.6;
        }
        .embed-box .copy-btn {
            margin-top: 10px;
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 7px 22px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 13px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .embed-box .copy-btn:hover { background: var(--primary-hover); }

        footer {
            text-align: center;
            padding: 18px 24px;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            background: var(--footer-bg);
            transition: background 0.3s, border 0.3s, color 0.3s;
            margin-top: auto;
        }
        footer a {
            color: var(--primary);
            text-decoration: none;
        }

        @media (max-width: 640px) {
            header { padding: 12px 16px; flex-direction: column; align-items: stretch; gap: 8px; }
            .nav { justify-content: space-between; }
            .demo-header { flex-direction: column; align-items: stretch; }
            .demo-order-btn { text-align: center; }
            .demo-card { padding: 18px 14px; }
            .calc-row label { flex: 0 0 100%; }
            .container { padding: 16px 12px; }
            .demo-title { font-size: 20px; flex-wrap: wrap; }
            .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
            .card .thumb { height: 90px; font-size: 38px; }
        }