/* Header */
        header {
            background: var(--bg-secondary);
            padding: 24px 0;
            margin-bottom: 32px;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text);
        }

        .header-controls {
            display: flex;
            gap: 16px;
            align-items: center;
            flex-wrap: wrap;
            min-width: 0;
        }

        /* Modern Theme Switch */
        .theme-switch-wrapper {
            display: flex;
            align-items: center;
        }

        .theme-switch {
            display: inline-block;
            height: 26px;
            position: relative;
            width: 50px;
        }

        .theme-switch input {
            display: none;
        }

        .slider {
            background-color: var(--bg);
            border: 1px solid var(--border);
            bottom: 0;
            cursor: pointer;
            left: 0;
            position: absolute;
            right: 0;
            top: 0;
            transition: .4s;
            border-radius: 34px;
        }

        .slider:before {
            background-color: var(--text-light);
            bottom: 3px;
            content: "";
            height: 18px;
            left: 3px;
            position: absolute;
            transition: .4s;
            width: 18px;
            border-radius: 50%;
        }

        input:checked + .slider {
            background-color: var(--accent);
            border-color: var(--accent);
        }

        input:checked + .slider:before {
            transform: translateX(24px);
            background-color: var(--bg);
        }

        /* Navigation */
        nav {
            display: flex;
            gap: 8px;
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .nav-btn {
            padding: 14px 22px;
            background: var(--bg-secondary);
            color: var(--text);
            border: 1px solid var(--border);
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            transition: all 0.2s;
        }

        .nav-btn:hover {
            background: var(--border);
            border-color: var(--accent);
        }

        .nav-btn.active {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
        }

        /* Chat Navigation Button */
        .nav-btn-chat {
            padding: 8px 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-btn-image {
            width: 32px;
            height: 32px;
            object-fit: contain;
            border-radius: 4px;
        }

        /* Content Grid */
        #content {
            display: grid;
            gap: 24px;
            grid-template-columns: minmax(0, 1fr);
        }

        /* Cards */
        .card {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 32px;
            transition: all 0.2s;
            min-width: 0;
        }

        .card:hover {
            border-color: var(--accent);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }

        .card-header {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 28px;
            border-bottom: 2px solid var(--border);
            padding-bottom: 20px;
        }

        .card-header h2 {
            font-size: 28px;
            font-weight: 600;
            margin: 0;
        }

        .card-header h3 {
            font-size: 24px;
            font-weight: 600;
            margin: 0;
        }

        .back-btn {
            background: var(--bg);
            border: 1px solid var(--border);
            padding: 8px 12px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 14px;
            color: var(--text);
            transition: all 0.2s;
            display: inline-block;
            margin-bottom: 16px;
        }

        .back-btn:hover {
            background: var(--border);
        }