:root {
            /* Light Theme Variables */
            --bg-body-1: #F0F4F8;
            --bg-body-2: #D9E2EC;
            --bg-sidebar-1: rgba(255, 255, 255, 0.95);
            --bg-sidebar-2: rgba(240, 244, 248, 0.95);
            --color-text: #102A43;
            --color-text-muted: #4A5568;
            --color-heading: #0F2942;
            --bg-card: #FFFFFF;
            --border-card: rgba(217, 226, 236, 0.8);
            --bg-code: #F8FAFC;
            --border-code: #D9E2EC;
            --bg-input: #FFFFFF;
            --color-input: #102A43;
            --border-input: #BCCCDC;
            --bg-stat-box: rgba(255, 255, 255, 0.55);
            --border-stat-box: rgba(217, 226, 236, 0.8);
            --bg-check-normal: #F8FAFC;
            --border-check-normal: #D9E2EC;
            --color-text-link: #1976D2;
            --color-text-link-hover: #1565C0;
            --blob-opacity: 0.16;

            --bg-auth-overlay: rgba(240, 244, 248, 0.45);
            --bg-auth-card: rgba(255, 255, 255, 0.85);
            --border-auth-card: rgba(16, 42, 67, 0.08);
            --color-auth-text: #102A43;
            --color-auth-text-muted: #4A5568;
            --bg-auth-input: #FFFFFF;
            --border-auth-input: #BCCCDC;
            --color-auth-label: #4A5568;
            --border-auth-btn-secondary: rgba(16, 42, 67, 0.15);
            --color-auth-btn-secondary: #102A43;
            --bg-auth-btn-secondary-hover: rgba(16, 42, 67, 0.05);

            --bg-archive-item: #FFFFFF;
            --bg-archive-item-hover: rgba(49, 130, 206, 0.08);
            --bg-archive-item-active: rgba(49, 130, 206, 0.15);
            --bg-sidebar-card: #FFFFFF;
        }

        [data-theme="dark"] {
            /* Dark Theme Variables */
            --bg-body-1: #0F172A;
            --bg-body-2: #1E293B;
            --bg-sidebar-1: rgba(15, 23, 42, 0.85);
            --bg-sidebar-2: rgba(30, 41, 59, 0.85);
            --color-text: #E2E8F0;
            --color-text-muted: #94A3B8;
            --color-heading: #F8FAFC;
            --bg-card: #1E293B;
            --border-card: rgba(148, 163, 184, 0.1);
            --bg-code: #1E293B;
            --border-code: #334155;
            --bg-input: #0F172A;
            --color-input: #F8FAFC;
            --border-input: #334155;
            --bg-stat-box: rgba(15, 23, 42, 0.55);
            --border-stat-box: rgba(51, 65, 85, 0.8);
            --bg-check-normal: rgba(30, 41, 59, 0.5);
            --border-check-normal: #334155;
            --color-text-link: #63B3ED;
            --color-text-link-hover: #90CDF4;
            --blob-opacity: 0.12;

            --bg-auth-overlay: rgba(15, 23, 42, 0.6);
            --bg-auth-card: rgba(30, 41, 59, 0.7);
            --border-auth-card: rgba(255, 255, 255, 0.1);
            --color-auth-text: #F8FAFC;
            --color-auth-text-muted: #94A3B8;
            --bg-auth-input: rgba(15, 23, 42, 0.6);
            --border-auth-input: rgba(148, 163, 184, 0.2);
            --color-auth-label: #CBD5E1;
            --border-auth-btn-secondary: rgba(255, 255, 255, 0.15);
            --color-auth-btn-secondary: #E2E8F0;
            --bg-auth-btn-secondary-hover: rgba(255, 255, 255, 0.05);

            --bg-archive-item: rgba(30, 41, 59, 0.4);
            --bg-archive-item-hover: rgba(49, 130, 206, 0.15);
            --bg-archive-item-active: rgba(49, 130, 206, 0.25);
            --bg-sidebar-card: rgba(30, 41, 59, 0.4);
        }

*, *::before, *::after {
            box-sizing: border-box;
        }

        html, body {
            min-height: 100vh;
            max-width: 100%;
            overflow-x: hidden;
        }

        body {
            font-family: "Outfit", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            color: var(--color-text);
            background-color: var(--bg-body-1);
            background: linear-gradient(135deg, var(--bg-body-1) 0%, var(--bg-body-2) 100%) no-repeat fixed;
            background-size: cover;
            margin: 0;
            padding: 0;
            display: flex;
            min-height: 100vh;
            scroll-behavior: smooth;
            overflow-x: hidden;
            transition: color 0.3s ease, background-color 0.3s ease;
        }

        /* Glassmorphic Animated Background Blobs */
        .bg-blob {
            position: fixed;
            border-radius: 50%;
            filter: blur(120px);
            opacity: var(--blob-opacity);
            z-index: -1;
            pointer-events: none;
            transition: opacity 0.3s ease, background 0.8s ease;
        }
        .blob-1 {
            width: 450px;
            height: 450px;
            background: radial-gradient(circle, #3182CE 0%, #63B3ED 100%);
            top: -10%;
            left: 20%;
            animation: floatBlob1 22s infinite ease-in-out alternate;
        }
        .blob-2 {
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, #4A5568 0%, #CBD5E0 100%);
            bottom: -10%;
            right: 5%;
            animation: floatBlob2 28s infinite ease-in-out alternate;
        }
        .blob-3 {
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, #319795 0%, #4FD1C5 100%);
            top: 35%;
            right: 30%;
            animation: floatBlob3 20s infinite ease-in-out alternate;
        }

        @keyframes floatBlob1 {
            0% { transform: translate(0, 0) scale(1); }
            50% { transform: translate(120px, 90px) scale(1.25); }
            100% { transform: translate(-60px, 140px) scale(0.9); }
        }
        @keyframes floatBlob2 {
            0% { transform: translate(0, 0) scale(1); }
            50% { transform: translate(-140px, -80px) scale(0.85); }
            100% { transform: translate(90px, -180px) scale(1.2); }
        }
        @keyframes floatBlob3 {
            0% { transform: translate(0, 0) scale(1); }
            50% { transform: translate(80px, -110px) scale(1.15); }
            100% { transform: translate(-100px, 60px) scale(0.95); }
        }

        /* Sidebar Toggle Floating Button */
        .sidebar-toggle {
            position: fixed;
            top: 20px;
            right: 20px;
            width: 45px;
            height: 45px;
            background-color: var(--color-text-link);
            color: white;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            z-index: 101;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
            transition: all 0.2s ease, background-color 0.3s ease;
        }
        .sidebar-toggle:hover {
            background-color: var(--color-text-link-hover);
            transform: scale(1.05);
        }
        .sidebar-toggle:active {
            transform: scale(0.95);
        }
        .toggle-icon {
            font-size: 20px;
            font-weight: bold;
            line-height: 1;
        }

        /* Dark overlay for mobile sidebar */
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(15, 23, 42, 0.4);
            backdrop-filter: blur(4px);
            z-index: 99;
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
        }
        body.sidebar-open .sidebar-overlay {
            display: block;
            opacity: 1;
            pointer-events: auto;
        }

        .sidebar {
            position: fixed;
            width: 340px;
            height: 100vh;
            top: 0;
            left: 0;
            background: linear-gradient(180deg, var(--bg-sidebar-1) 0%, var(--bg-sidebar-2) 100%);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            color: var(--color-text);
            padding: 25px 16px;
            box-sizing: border-box;
            border-right: 3px solid var(--color-text-link);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;
            z-index: 100;
            text-align: center;
            box-shadow: 4px 0 15px rgba(16, 42, 67, 0.05);
            overflow-y: auto;
            transform: translateX(0);
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s ease, border-color 0.3s ease;
        }
        body.sidebar-collapsed .sidebar {
            transform: translateX(-340px);
        }
        
        .sidebar-top {
            width: 100%;
        }
        .sidebar-badge {
            background: linear-gradient(135deg, var(--color-text-link), #805AD5);
            color: white;
            font-size: 9.5px;
            font-weight: 800;
            padding: 4px 10px;
            border-radius: 20px;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: inline-block;
            margin-bottom: 10px;
            box-shadow: 0 2px 8px rgba(25, 118, 210, 0.25);
            transition: background-color 0.3s ease;
        }
        .sidebar-section {
            width: 100%;
            margin-bottom: 5px;
        }
        .sidebar-section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 8px 11px;
            background: var(--bg-stat-box);
            border: 1.5px solid var(--border-stat-box);
            border-radius: 8px;
            cursor: pointer;
            font-size: 12px;
            font-weight: 700;
            color: var(--color-text);
            transition: all 0.2s ease;
            user-select: none;
        }
        .sidebar-section-header:hover {
            background: var(--border-stat-box);
            transform: translateX(2px);
        }
        .section-chevron {
            font-size: 10px;
            opacity: 0.5;
            transition: transform 0.25s ease;
        }
        .sidebar-section.collapsed .section-chevron {
            transform: rotate(-90deg);
        }
        .sidebar-section-body {
            padding: 8px 2px 4px 2px;
            max-height: 500px;
            overflow: hidden;
            transition: max-height 0.3s ease, opacity 0.25s ease, padding 0.3s ease;
            opacity: 1;
        }
        .sidebar-section.collapsed .sidebar-section-body {
            max-height: 0;
            opacity: 0;
            padding: 0 2px;
        }
        .sidebar-title {
            font-size: 20px;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin: 0 0 2px 0;
            color: var(--color-heading);
            line-height: 1.15;
            transition: color 0.3s ease;
        }
        .sidebar-subtitle {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            color: var(--color-text-link);
            margin: 0 0 20px 0;
            letter-spacing: 0.5px;
            line-height: 1.4;
            transition: color 0.3s ease;
        }
        .sidebar-stats {
            background: var(--bg-stat-box);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-radius: 12px;
            padding: 15px;
            border: 1.5px solid var(--border-stat-box);
            text-align: left;
            width: 100%;
            box-sizing: border-box;
            margin-bottom: 15px;
            box-shadow: 0 2px 4px rgba(16, 42, 67, 0.01);
            transition: background 0.3s ease, border-color 0.3s ease;
        }
        .stat-row {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 14px;
            color: var(--color-text-muted);
            transition: color 0.3s ease;
        }
        .stat-row:last-child {
            margin-bottom: 0;
        }
        .stat-row span.val {
            font-weight: 700;
            color: var(--color-text-link);
            transition: color 0.3s ease;
        }
        .progress-bar-container {
            width: 100%;
            height: 8px;
            background: var(--border-code);
            border-radius: 10px;
            overflow: hidden;
            margin-top: 10px;
            transition: background 0.3s ease;
        }
        .progress-bar-fill {
            height: 100%;
            width: 0%;
            background: var(--color-text-link);
            transition: width 0.3s ease, background-color 0.3s ease;
            box-shadow: 0 0 8px rgba(25, 118, 210, 0.3);
        }
        
        .btn-generate {
            background-color: var(--color-text-link);
            color: white;
            border: none;
            padding: 12px 20px;
            font-size: 14px;
            font-weight: 800;
            border-radius: 8px;
            cursor: pointer;
            width: 100%;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 6px rgba(25, 118, 210, 0.15);
            transition: all 0.25s ease;
            margin-top: 5px;
            animation: subtlePulse 2.5s infinite ease-in-out;
        }
        .btn-generate:hover {
            background-color: var(--color-text-link-hover);
            animation: none;
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 6px 20px rgba(25, 118, 210, 0.35);
        }
        .btn-generate:active {
            transform: translateY(0) scale(0.98);
        }
        .sidebar-qr-container {
            width: 100%;
            margin-top: 20px;
        }
        .sidebar-qr {
            width: 100px;
            height: 100px;
            background: white;
            border-radius: 10px;
            border: 3px solid var(--color-text-link);
            padding: 6px;
            margin: 10px auto;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            display: block;
            transition: transform 0.25s ease, border-color 0.3s ease;
        }
        .sidebar-qr:hover {
            transform: scale(1.05);
        }
        .sidebar-qr-link {
            color: var(--color-text-link);
            font-size: 11px;
            font-weight: 700;
            text-decoration: underline;
            transition: color 0.3s ease;
        }
        .sidebar-qr-link:hover {
            color: var(--color-heading);
        }
        
        /* Layout Container Split Screen */
        .main-content {
            margin-left: 340px;
            width: calc(100% - 340px);
            max-width: calc(100% - 340px);
            min-width: 0;
            padding: 40px 35px;
            padding-top: 60px;
            flex-grow: 1;
            box-sizing: border-box;
            transition: margin-left 0.3s cubic-bezier(0.16, 1, 0.3, 1), width 0.3s cubic-bezier(0.16, 1, 0.3, 1), max-width 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
        }
        body.sidebar-collapsed .main-content {
            margin-left: 60px;
            width: calc(100% - 60px);
            max-width: calc(100% - 60px);
        }

        .app-container {
            display: flex;
            gap: 30px;
            align-items: flex-start;
            width: 100%;
            box-sizing: border-box;
        }
        .tasks-column {
            flex: 1;
            min-width: 0;
            box-sizing: border-box;
        }
        
        /* Compiler column sticky sidebar */
        .compiler-column {
            display: none;
            width: 610px;
            flex-shrink: 0;
            position: sticky;
            top: 60px;
            z-index: 90;
            box-sizing: border-box;
            flex-direction: column;
            gap: 20px;
            max-height: calc(100vh - 80px);
            overflow-y: auto;
        }
        body.variant-generated .compiler-column,
        body.catalog-active .compiler-column {
            display: flex;
        }

        body.exam-mode {
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
        body.exam-mode input,
        body.exam-mode textarea {
            -webkit-user-select: text;
            -moz-user-select: text;
            -ms-user-select: text;
            user-select: text;
        }

        /* Task Database Sidebar Catalog styles */
        .sidebar-catalog-section {
            margin-bottom: 20px;
            border-top: 1px solid var(--border-card);
            padding-top: 15px;
        }
        .sidebar-catalog-title {
            border-bottom: 1px solid var(--border-card);
            padding-bottom: 8px;
            margin-bottom: 12px;
            font-size: 13.5px;
            font-weight: 700;
            color: var(--color-heading);
            text-align: left;
        }
        details.sidebar-section summary::-webkit-details-marker { display: none; }
        details.sidebar-section summary { list-style: none; cursor: pointer; user-select: none; }
        details.sidebar-section[open] > summary .arrow { transform: rotate(90deg); display: inline-block; }
        .sidebar-catalog-selects {
            display: flex;
            gap: 6px;
        }
        .sidebar-catalog-select {
            flex: 1.2;
            padding: 8px 10px;
            border-radius: 8px;
            background: var(--bg-input);
            border: 1.5px solid var(--border-input);
            color: var(--color-text);
            font-size: 12.5px;
            font-weight: 600;
            cursor: pointer;
            outline: none;
            transition: border-color 0.2s ease;
        }
        .sidebar-catalog-select:focus {
            border-color: var(--color-text-link);
        }
        .sidebar-catalog-btn {
            width: 100%;
            margin-top: 5px;
            padding: 9px;
            font-size: 12.5px;
            font-weight: 700;
            border-radius: 8px;
            color: white;
            background-color: var(--color-text-link);
            border: 1.5px solid var(--color-text-link);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .sidebar-catalog-btn:hover {
            opacity: 0.9;
            transform: translateY(-0.5px);
        }

        /* Task Card Star Button styles */
        .task-favorite-btn {
            padding: 4px 8px;
            font-size: 15px;
            border-radius: 6px;
            border: 1px solid var(--border-input);
            background: transparent;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            color: var(--color-text-muted);
        }
        .task-favorite-btn:hover {
            border-color: var(--color-text-link);
            background: var(--bg-code);
        }
        .task-favorite-btn.active {
            color: #FFD700 !important;
            border-color: rgba(255, 215, 0, 0.3);
        }

        /* Favorites Card styles */
        .favorites-card {
            border-left-color: #EDC951 !important;
            animation-delay: 0.08s;
        }

        .header-box {
            text-align: center;
            margin-bottom: 40px;
            padding: 25px;
            background: linear-gradient(135deg, var(--color-text-link) 0%, #475569 100%);
            color: white;
            border-radius: 12px;
            box-shadow: 0 4px 15px rgba(25, 118, 210, 0.15);
            animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
            transition: background 0.3s ease;
        }
        .header-box h1 {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
        }
        .header-box p {
            margin: 10px 0 0 0;
            opacity: 0.9;
            font-size: 16px;
        }
        .card {
            background: var(--bg-card);
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(16, 42, 67, 0.03);
            border: 1px solid var(--border-card);
            padding: 28px;
            margin-bottom: 30px;
            border-left: 6px solid var(--color-text-link);
            position: relative;
            opacity: 0;
            transform: translateY(20px);
            animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.3s ease, background 0.3s ease;
            box-sizing: border-box;
            width: 100%;
            content-visibility: auto;
            contain-intrinsic-size: 1px 250px;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(16, 42, 67, 0.08);
            background: rgba(255, 255, 255, 0.92);
        }
        [data-theme="dark"] .card:hover {
            background: rgba(30, 41, 59, 0.9);
        }
        .card h3 {
            margin-top: 0;
            color: var(--color-heading);
            border-bottom: 1.5px solid var(--border-card);
            padding-bottom: 10px;
            font-size: 18px;
            transition: color 0.3s ease, border-color 0.3s ease;
        }
        pre, code, tt {
            background-color: var(--bg-code);
            padding: 2px 6px;
            border-radius: 4px;
            border: 1px solid var(--border-code);
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            font-size: 13.5px;
            transition: background-color 0.3s ease, border-color 0.3s ease;
        }
        pre {
            padding: 14px;
            overflow-x: auto;
            display: block;
            border: 1px solid var(--border-code);
            line-height: 1.4;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
        }
        th, td {
            border: 1px solid var(--border-code);
            padding: 12px;
            vertical-align: top;
            transition: border-color 0.3s ease;
        }
        th {
            background-color: var(--bg-code);
            color: var(--color-heading);
            font-weight: 700;
            transition: background-color 0.3s ease, color 0.3s ease;
        }
        table.code th {
            background-color: var(--bg-code);
        }
        table.code td.pre {
            font-family: monospace;
            white-space: pre-wrap;
        }
        table.varanswer {
            width: 100%;
            border-collapse: collapse;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            border-radius: 8px;
            overflow: hidden;
        }
        table.varanswer th {
            background-color: var(--color-text-link);
            color: white;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }
        table.varanswer td {
            text-align: center;
        }
        a {
            color: var(--color-text-link);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--color-text-link-hover);
            text-decoration: underline;
        }
        img {
            max-width: 100% !important;
            height: auto !important;
            box-sizing: border-box !important;
            margin: 20px 0;
            border: 1.5px solid var(--border-code);
            border-radius: 8px;
            padding: 6px;
            background: white;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
            transition: border-color 0.3s ease;
        }

        #student-page-view,
        #student-profile-details,
        #student-variant-tasks-container,
        .card,
        .header-box {
            max-width: 100% !important;
            box-sizing: border-box !important;
            overflow-wrap: break-word;
        }
        .task-files {
            background-color: #EBF8FF;
            border: 1px solid #BEE3F8;
            color: #1976D2;
            padding: 10px 16px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: inline-block;
            font-size: 13.5px;
            transition: all 0.25s ease;
        }
        [data-theme="dark"] .task-files {
            background-color: rgba(99, 179, 237, 0.15);
            border-color: rgba(99, 179, 237, 0.3);
            color: #90CDF4;
        }
        .task-files:hover {
            background-color: #E2F4FF;
            transform: translateX(3px);
        }
        [data-theme="dark"] .task-files:hover {
            background-color: rgba(99, 179, 237, 0.25);
        }
        .task-files a {
            color: inherit;
            text-decoration: underline;
        }
        .overview-table {
            background: var(--bg-card);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 4px rgba(0,0,0,0.01);
            border: 1px solid var(--border-code);
            transition: background 0.3s ease, border-color 0.3s ease;
        }
        .overview-table th {
            background-color: var(--color-text-link);
            color: white;
            transition: background-color 0.3s ease;
        }
        
        /* Interactive Input Panel */
        .check-container {
            margin-top: 20px;
            padding: 15px;
            background: var(--bg-check-normal);
            border: 1.5px solid var(--border-check-normal);
            border-radius: 8px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            transition: all 0.3s ease;
        }
        .check-container.correct {
            border-color: #48BB78;
            background-color: rgba(72, 187, 120, 0.1);
            box-shadow: 0 0 10px rgba(72, 187, 120, 0.15);
        }
        .check-container.incorrect {
            border-color: #F56565;
            background-color: rgba(245, 101, 101, 0.1);
            box-shadow: 0 0 10px rgba(245, 101, 101, 0.15);
        }
        .ans-input {
            padding: 8px 12px;
            border: 1.5px solid var(--border-input);
            border-radius: 6px;
            font-size: 14px;
            outline: none;
            width: 180px;
            font-family: inherit;
            background: var(--bg-input);
            color: var(--color-input);
            transition: all 0.25s ease;
        }
        .ans-input:focus {
            border-color: var(--color-text-link);
            box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
        }
        .correct .ans-input {
            border-color: #48BB78;
        }
        .incorrect .ans-input {
            border-color: #F56565;
        }
        .btn-check {
            background-color: var(--color-text-link);
            color: white;
            border: none;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-check:hover {
            background-color: var(--color-text-link-hover);
            transform: translateY(-1px);
            box-shadow: 0 4px 8px rgba(25, 118, 210, 0.2);
        }
        .btn-check:active {
            transform: translateY(0) scale(0.96);
        }
        .status-badge {
            font-weight: 800;
            font-size: 14px;
            animation: fadeInUp 0.3s ease;
        }
        .status-badge.ok {
            color: #38A169;
        }
        .status-badge.err {
            color: #E53E3E;
        }
        .reveal-link {
            font-size: 13px;
            color: var(--color-text-muted);
            text-decoration: underline;
            cursor: pointer;
            margin-left: auto;
            user-select: none;
            transition: color 0.2s ease;
        }
        .reveal-link:hover {
            color: var(--color-text-link);
        }
        .ai-link {
            color: var(--color-text-link);
            font-weight: bold;
        }
        .ai-link:hover {
            color: var(--color-text-link-hover);
        }
        .answer-key-box {
            font-size: 13.5px;
            color: var(--color-text-muted);
            width: 100%;
            margin-top: 10px;
            border-top: 1px dashed var(--border-code);
            padding-top: 10px;
            animation: fadeInUp 0.3s ease;
        }
        .answer-key-box b {
            color: var(--color-text);
            font-family: monospace;
            font-size: 14.5px;
        }
        
        /* Compiler UI styles */
        .templates-row {
            display: flex;
            flex-direction: column;
            gap: 12px;
            box-sizing: border-box;
        }
        details.templates-dropdown {
            background: var(--bg-code);
            border: 1px solid var(--border-card);
            border-radius: 8px;
            overflow: hidden;
            box-sizing: border-box;
            transition: all 0.3s ease;
            margin-bottom: 16px;
            width: 100%;
        }
        details.templates-dropdown[open] {
            border-color: var(--color-text-link);
            box-shadow: 0 4px 12px rgba(25, 118, 210, 0.08);
            background: var(--bg-code);
        }
        summary.templates-dropdown-summary {
            padding: 10px 14px;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-text);
            cursor: pointer;
            user-select: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            outline: none;
            list-style: none;
            transition: background-color 0.25s ease;
        }
        summary.templates-dropdown-summary::-webkit-details-marker {
            display: none;
        }
        summary.templates-dropdown-summary:hover {
            background-color: var(--border-card);
        }
        summary.templates-dropdown-summary::after {
            content: "▾";
            font-size: 14px;
            color: var(--color-text-muted);
            transition: transform 0.2s ease;
        }
        details.templates-dropdown[open] summary.templates-dropdown-summary::after {
            transform: rotate(180deg);
        }
        .template-category {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: 8px;
            padding: 12px;
            box-sizing: border-box;
            transition: border-color 0.3s ease, background-color 0.3s ease;
        }
        .template-category-title {
            font-size: 11px;
            font-weight: 800;
            color: var(--color-text-muted);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .template-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .btn-tmpl {
            background: var(--bg-code);
            border: 1px solid var(--border-input);
            color: var(--color-text);
            padding: 8px 12px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s ease;
            user-select: none;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
        }
        .btn-tmpl:hover {
            background: var(--color-text-link);
            color: white;
            border-color: var(--color-text-link);
            transform: translateY(-1px);
            box-shadow: 0 4px 8px rgba(25, 118, 210, 0.15);
        }
        .terminal-console {
            background: #020617;
            border-top: 1.5px solid #1E293B;
            height: 160px;
            overflow-y: auto;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
            font-size: 12.5px;
            padding: 16px 12px 10px 12px;
            box-sizing: border-box;
            color: #48BB78;
            white-space: pre-wrap;
            word-break: break-all;
            line-height: 1.4;
        }
        .btn-run {
            background-color: #38A169;
            color: white;
            border: none;
            padding: 10px 16px;
            font-size: 13px;
            font-weight: 800;
            border-radius: 6px;
            cursor: pointer;
            flex-grow: 2;
            transition: all 0.2s ease;
        }
        .btn-run:hover {
            background-color: #2F855A;
            box-shadow: 0 4px 10px rgba(56, 161, 105, 0.2);
        }
        .btn-save-py {
            background-color: var(--color-text-link);
            color: white;
            border: none;
            padding: 10px 16px;
            font-size: 13px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            flex-grow: 1.2;
            transition: all 0.2s ease;
        }
        .btn-save-py:hover {
            background-color: var(--color-text-link-hover);
            box-shadow: 0 4px 10px rgba(25, 118, 210, 0.2);
        }
        .btn-clear-console {
            background-color: var(--border-code);
            color: var(--color-text);
            border: 1px solid var(--border-code);
            padding: 10px 16px;
            font-size: 13px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            flex-grow: 1;
            transition: all 0.2s ease;
        }
        .btn-clear-console:hover {
            background-color: var(--bg-code);
        }

        /* Exam Mode: hide templates, AI chat, catalog, sidebar extras */
        body.exam-mode .templates-dropdown,
        body.exam-mode .sidebar-catalog-section,
        body.exam-mode .sidebar-qr-container,
        body.exam-mode .sidebar-badge,
        body.exam-mode .task-favorite-btn,
        body.exam-mode .btn-save-py,
        body.exam-mode #variant-live-score-card {
            display: none !important;
        }
        body.exam-mode .card .reveal-link,
        body.exam-mode .card a[onclick*="revealAnswer"] {
            display: none !important;
        }
        body.exam-mode .btn-generate {
            animation: none !important;
        }
        body.exam-mode .header-box {
            background: linear-gradient(135deg, #E53E3E 0%, #DD6B20 100%) !important;
        }
        body.exam-mode .header-box.exam-header-box {
            display: block !important;
        }

        /* Exam-mode notification banner */
        .exam-notification {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: linear-gradient(135deg, #E53E3E, #DD6B20);
            color: white;
            text-align: center;
            padding: 8px 20px;
            font-size: 13px;
            font-weight: 700;
            box-shadow: 0 4px 20px rgba(229,62,62,0.3);
        }
        body.exam-mode .exam-notification {
            display: block;
        }
        body.exam-mode {
            padding-top: 40px;
        }
        body.exam-mode .sidebar-toggle {
            display: none;
        }
        body.exam-mode .sidebar {
            transform: translateX(-340px) !important;
        }
        body.exam-mode .sidebar-overlay {
            display: none !important;
        }
        body.exam-mode .main-content {
            margin-left: 60px !important;
            width: calc(100% - 60px) !important;
            max-width: calc(100% - 60px) !important;
        }

        body.exam-mode #sidebar-avatar {
            pointer-events: none;
            opacity: 0.4;
        }
        body.exam-mode .archive-item {
            pointer-events: none;
            opacity: 0.5;
        }
        #exam-timer {
            transition: color 0.5s ease;
        }
        #exam-timer.urgent {
            color: #E53E3E;
            animation: pulse 1s infinite;
        }

        /* Hide Scrollbars ("Листалки") on terminal, templates, sidebar & compiler container */
        .terminal-console::-webkit-scrollbar,
        .templates-row::-webkit-scrollbar,
        .compiler-column::-webkit-scrollbar,
        .sidebar::-webkit-scrollbar {
            display: none;
        }
        .terminal-console,
        .templates-row,
        .compiler-column,
        .sidebar {
            -ms-overflow-style: none;  /* IE and Edge */
            scrollbar-width: none;  /* Firefox */
        }

        /* Dropdown style for answers */
        details.answers-dropdown {
            margin-top: 50px;
            background: var(--bg-code);
            border: 2px dashed var(--color-text-link);
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.02);
            color: var(--color-heading);
            opacity: 0;
            animation: fadeInUp 0.5s ease forwards;
            transition: all 0.25s ease;
        }
        details.answers-dropdown:hover {
            box-shadow: 0 8px 20px rgba(25, 118, 210, 0.08);
            background: var(--bg-card);
        }
        details.answers-dropdown summary {
            font-weight: 800;
            font-size: 18px;
            color: var(--color-heading);
            cursor: pointer;
            outline: none;
            user-select: none;
        }
        details.answers-dropdown summary:hover {
            color: var(--color-text-link);
        }
        details.answers-dropdown[open] {
            border-style: solid;
            background: var(--bg-card);
        }
        details.answers-dropdown[open] summary {
            border-bottom: 1.5px solid var(--border-code);
            padding-bottom: 10px;
            margin-bottom: 15px;
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        @keyframes subtlePulse {
            0% {
                box-shadow: 0 4px 6px rgba(25, 118, 210, 0.15);
                transform: scale(1);
            }
            50% {
                box-shadow: 0 4px 20px rgba(25, 118, 210, 0.4);
                transform: scale(1.02);
            }
            100% {
                box-shadow: 0 4px 6px rgba(25, 118, 210, 0.15);
                transform: scale(1);
            }
        }

        /* Responsive Breakpoints */
        @media (max-width: 1250px) {
            .compiler-column {
                width: 500px;
            }
        }
        @media (max-width: 1100px) {
            .app-container {
                flex-direction: column;
                width: 100%;
            }
            .tasks-column {
                width: 100% !important;
                margin: 0 !important;
            }
            .compiler-column {
                width: 100% !important;
                position: relative;
                top: 0;
                z-index: 10;
                margin-top: 30px;
                max-height: none;
                overflow-y: visible;
                display: none;
            }
            body.variant-generated .compiler-column,
            body.catalog-active .compiler-column {
                display: flex;
            }
        }

        @media (max-width: 850px) {
            body {
                flex-direction: column;
            }
            .sidebar-toggle {
                top: 15px;
                left: 15px;
                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            }
            .sidebar {
                position: fixed;
                width: 280px;
                height: 100vh;
                border-right: 3px solid var(--color-text-link);
                border-bottom: none;
                padding: 20px 14px;
                padding-top: 70px;
                transform: translateX(-280px);
                z-index: 102;
                box-shadow: 4px 0 15px rgba(0, 0, 0, 0.2);
            }
            body.sidebar-open .sidebar {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0 !important;
                padding: 20px 15px;
                padding-top: 80px;
                width: 100% !important;
                max-width: 100% !important;
                min-width: 0 !important;
            }
            .header-box {
                padding: 18px;
                margin-bottom: 25px;
            }
            .header-box h1 {
                font-size: 22px;
            }
            .header-box p {
                font-size: 14px;
            }
            .card {
                padding: 18px;
                margin-bottom: 20px;
            }
            .check-container {
                flex-direction: column;
                align-items: stretch;
                gap: 10px;
            }
            .ans-input {
                width: 100%;
            }
            .btn-check {
                width: 100%;
            }
            .reveal-link {
                margin-left: 0;
                text-align: center;
                margin-top: 5px;
            }
            .overview-table-wrapper, .varanswer-wrapper {
                overflow-x: auto;
                width: 100%;
                margin: 15px 0;
                -webkit-overflow-scrolling: touch;
            }
            table {
                margin: 0;
                min-width: 500px;
            }
        }
        
        /* Auth Overlay & Card Styling */
        .auth-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            width: 100%;
            height: 100%;
            background: var(--bg-auth-overlay);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            box-sizing: border-box;
            padding: 20px;
            overflow-y: auto;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }
        .auth-card {
            background: var(--bg-auth-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--border-auth-card);
            border-radius: 16px;
            width: 100%;
            max-width: 420px;
            padding: 40px 30px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
            box-sizing: border-box;
            color: var(--color-auth-text);
            animation: scaleIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
        }
        @keyframes scaleIn {
            from {
                opacity: 0;
                transform: scale(0.95) translateY(10px);
            }
            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }
        .auth-header {
            text-align: center;
            margin-bottom: 30px;
        }
        .auth-header h2 {
            margin: 0;
            font-size: 26px;
            font-weight: 800;
            background: linear-gradient(135deg, #38BDF8 0%, #C084FC 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 0.5px;
        }
        .auth-header p {
            margin: 8px 0 0 0;
            font-size: 13px;
            color: var(--color-auth-text-muted);
        }
        .auth-input-group {
            margin-bottom: 20px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .auth-input-group label {
            font-size: 11px;
            font-weight: 700;
            color: var(--color-auth-label);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            text-align: left;
        }
        .auth-input-group input {
            background: var(--bg-auth-input);
            border: 1.5px solid var(--border-auth-input);
            border-radius: 8px;
            padding: 12px 14px;
            font-size: 14px;
            color: var(--color-auth-text);
            outline: none;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .auth-input-group input:focus {
            border-color: #38BDF8;
            box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
        }
        .auth-error-msg {
            color: #F87171;
            font-size: 13px;
            margin-bottom: 15px;
            min-height: 18px;
            text-align: center;
            font-weight: 600;
        }
        .btn-auth-primary {
            width: 100%;
            background: linear-gradient(135deg, #38BDF8 0%, #C084FC 100%);
            border: none;
            border-radius: 8px;
            color: #FFFFFF;
            padding: 12px;
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 4px 15px rgba(192, 132, 252, 0.25);
        }
        .btn-auth-primary:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(192, 132, 252, 0.35);
        }
        .auth-divider {
            display: flex;
            align-items: center;
            text-align: center;
            margin: 20px 0;
            color: var(--color-auth-text-muted);
        }
        .auth-divider::before, .auth-divider::after {
            content: '';
            flex: 1;
            border-bottom: 1px solid var(--border-auth-card);
        }
        .auth-divider:not(:empty)::before {
            margin-right: .25em;
        }
        .auth-divider:not(:empty)::after {
            margin-left: .25em;
        }
        .auth-divider span {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--color-auth-text-muted);
        }
        .btn-auth-secondary {
            width: 100%;
            background: transparent;
            border: 1.5px solid var(--border-auth-btn-secondary);
            border-radius: 8px;
            color: var(--color-auth-btn-secondary);
            padding: 11px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .btn-auth-secondary:hover {
            background: var(--bg-auth-btn-secondary-hover);
            border-color: var(--border-auth-btn-secondary);
            color: var(--color-auth-text);
        }
        .auth-card a {
            color: #38BDF8;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.2s ease;
        }
        .auth-card a:hover {
            color: #C084FC;
        }

        /* Archive Items Sidebar List */
        .archive-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--bg-archive-item);
            border: 1px solid var(--border-card);
            border-radius: 8px;
            padding: 10px 12px;
            margin-bottom: 8px;
            cursor: pointer;
            transition: all 0.25s ease;
            text-align: left;
        }
        .archive-item:hover {
            background: var(--bg-archive-item-hover);
            border-color: var(--color-text-link);
            transform: translateX(3px);
            box-shadow: 0 4px 12px rgba(49, 130, 206, 0.1);
        }
        .archive-item.active-archive-link {
            background: var(--bg-archive-item-active);
            border-color: var(--color-text-link);
            box-shadow: 0 0 10px rgba(49, 130, 206, 0.2);
            position: relative;
        }
        .archive-item.active-archive-link::before {
            content: '';
            position: absolute;
            left: 0;
            top: 25%;
            height: 50%;
            width: 3px;
            background: var(--color-text-link);
            border-radius: 0 4px 4px 0;
        }
        .archive-item-icon {
            font-size: 14px;
        }
        .archive-item-title {
            font-size: 12.5px;
            font-weight: 600;
            color: var(--color-text);
        }