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

        :root {
            --card: #050f26;
            --card-2: #08193a;
            --text: #ffffff;
            --muted: #ffffff;
            --accent: #00eeff;
            --accent-2: #ffd54a;
            --chip: #172d5f;
            --ring: 0 0 0 2px rgba(25, 95, 111, .45), 0 8px 18px rgba(0, 0, 0, .35);
            --shadow: 0 10px 20px rgba(0, 0, 0, .35);
            --radius: 16px;
        }

        @font-face {
            font-display: swap;
            font-family: 'Ubuntu';
            font-style: normal;
            font-weight: 300;
            src: url('fonts/ubuntu-v20-latin-300.woff2') format('woff2'), url('fonts/ubuntu-v20-latin-300.woff') format('woff');
        }

        @font-face {
            font-display: swap;
            font-family: 'Ubuntu';
            font-style: normal;
            font-weight: 400;
            src: url('fonts/ubuntu-v20-latin-regular.woff2') format('woff2'), url('fonts/ubuntu-v20-latin-regular.woff') format('woff');
        }

        @font-face {
            font-display: swap;
            font-family: 'Ubuntu';
            font-style: normal;
            font-weight: 500;
            src: url('fonts/ubuntu-v20-latin-500.woff2') format('woff2'), url('fonts/ubuntu-v20-latin-500.woff') format('woff');
        }

        @font-face {
            font-display: swap;
            font-family: 'Ubuntu';
            font-style: normal;
            font-weight: 700;
            src: url('fonts/ubuntu-v20-latin-700.woff2') format('woff2'), url('fonts/ubuntu-v20-latin-700.woff') format('woff');
        }

        html,
        body {
            height: 100%;
            color: var(--text);
            font-family: 'Ubuntu', Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
            background-color: #000a1e;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='250' height='30' viewBox='0 0 1000 120'%3E%3Crect fill='%23081b41' width='1000' height='120'/%3E%3Cg fill='none' stroke='%23172d5f' stroke-width='10' stroke-opacity='1'%3E%3Cpath d='M-500 75c0 0 125-30 250-30S0 75 0 75s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 45c0 0 125-30 250-30S0 45 0 45s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 105c0 0 125-30 250-30S0 105 0 105s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 15c0 0 125-30 250-30S0 15 0 15s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500-15c0 0 125-30 250-30S0-15 0-15s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 135c0 0 125-30 250-30S0 135 0 135s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3C/g%3E%3C/svg%3E");
            background-attachment: fixed;
            background-size: 250px 30px;
        }

        body {
            margin: 0;
            overflow-x: hidden;
        }

        body.sidebar-open {
            overflow: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        img {
            display: block;
            max-width: 100%;
            height: auto;
        }

        .app {
            position: relative;
            min-height: 100dvh;
        }

        .topbar {
            position: sticky;
            top: 0;
            z-index: 5;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 7px 12px;
            background: linear-gradient(180deg, rgba(0, 42, 133, 0.8), rgba(12, 37, 89, .7));
            backdrop-filter: blur(7px);
            border-bottom: 1px solid rgba(129, 173, 255, 0.300);
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 4px;
        }

        .brand-logo {
            width: 30px;
            height: 25px;
            border-radius: 5px;
            overflow: hidden;
            box-shadow: var(--ring);
            background: #000;
        }

        .brand-logo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .brand-name {
            font-weight: 800;
            letter-spacing: .2px;
        }

        .menu-btn {
            margin-left: auto;
            display: flex;
            flex-direction: column;
            justify-content: space-around;
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, rgba(255, 255, 255, .15), rgba(255, 255, 255, .07));
            border: 1px solid rgba(255, 255, 255, .15);
            border-radius: 10px;
            cursor: pointer;
            padding: 8px;
            z-index: 15;
            box-shadow: 0 4px 12px rgba(0, 0, 0, .25);
            transition: background .2s ease;
        }

        .menu-btn:hover {
            background: linear-gradient(135deg, rgba(255, 255, 255, .2), rgba(255, 255, 255, .1));
        }

        .menu-btn span {
            width: 100%;
            height: 2px;
            background-color: var(--text);
            border-radius: 2px;
            transition: all 0.3s ease-in-out;
            transform-origin: center;
        }

        .menu-btn.is-open span:nth-child(1) {
            transform: translateY(6px) rotate(45deg);
        }

        .menu-btn.is-open span:nth-child(2) {
            opacity: 0;
            transform: translateX(-20px);
        }

        .menu-btn.is-open span:nth-child(3) {
            transform: translateY(-6px) rotate(-45deg);
        }

        .sidebar {
            position: fixed;
            top: 64px;
            right: 12px;
            width: 260px;
            background: linear-gradient(180deg, rgba(0, 28, 39, 0.9) 0%, rgba(8, 25, 58, 0.95) 100%);
            backdrop-filter: blur(12px);
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, .3);
            border-radius: var(--radius);
            transform: translateX(calc(100% + 24px)) scale(0.98);
            transform-origin: top right;
            opacity: 0;
            visibility: hidden;
            transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.3s ease, visibility 0.3s ease;
            z-index: 10;
            padding: 16px;
        }

        .sidebar.is-open {
            transform: translateX(0) scale(1);
            opacity: 1;
            visibility: visible;
        }

        .sidebar-title {
            text-align: center;
            color: var(--accent);
            font-size: 16px;
            font-weight: 700;
            margin: 0 0 16px;
            text-transform: uppercase;
            letter-spacing: .5px;
        }

        .sidebar-nav {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(255, 255, 255, .1), rgba(255, 255, 255, .05));
            border: 1px solid rgba(255, 255, 255, .12);
            color: var(--text);
            font-weight: 500;
            font-size: 16px;
            text-shadow: 0 1px 2px rgba(0, 0, 0, .2);
            transition: all .2s ease;
        }

        .sidebar-nav a:hover {
            background: linear-gradient(135deg, rgba(0, 238, 255, .15), rgba(0, 238, 255, .1));
            color: var(--accent);
            border-color: rgba(0, 238, 255, .3);
            transform: translateY(-1px);
            box-shadow: 0 4px 10px rgba(0, 0, 0, .2);
        }

        .sidebar-nav .icon {
            width: 22px;
            height: 22px;
            color: var(--accent);
            transition: color .2s ease;
        }

        .sidebar-footer {
            margin-top: 20px;
            padding-top: 16px;
            border-top: 1px solid rgba(255, 255, 255, .1);
            text-align: center;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            align-items: baseline;
            gap: 6px;
            margin-bottom: 8px;
        }

        .footer-links span {
            color: rgba(255, 255, 255, 0.4);
        }

        .privacy-link {
            display: inline-block;
            font-size: 13px;
            font-weight: 500;
            background: linear-gradient(90deg, var(--accent), rgb(81, 255, 162));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .copyright-text {
            margin: 0;
            font-size: 12px;
            color: rgba(255, 255, 255, .5);
        }

        .menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, .5);
            z-index: 9;
            opacity: 0;
            visibility: hidden;
            transition: opacity .3s ease, visibility .3s ease;
        }

        .menu-overlay.is-open {
            opacity: 1;
            visibility: visible;
        }

        .content {
            position: relative;
            z-index: 1;
            padding: 7px 7px 7px;
        }

        @media (min-width:540px) {
            .content {
                width: min(1400px, calc(100% - 40px));
                max-width: none;
                margin-inline: auto;
            }

            .topbar {
                padding-inline: 20px;
                border-radius: 0 0 16px 16px;
                width: min(1400px, calc(100% - 40px));
                margin: 0 auto;
            }
        }

        .page-header {
            text-align: center;
            background: linear-gradient(180deg, var(--card) 0%, var(--card-2) 100%);
            border: 1px solid rgba(119, 255, 0, 0.394);
            padding-top: 10px;
            padding-bottom: 11px;
            border-radius: var(--radius);
            margin: 0px 0 0px;
        }

        .page-title {
            font-size: 16px;
            font-weight: 500;
            color: greenyellow;
            letter-spacing: 1px;
            margin: 0;
        }

        .page-subtitle {
            font-size: 13px;
            color: var(--muted);
            opacity: 0.9;
            margin-bottom: 0px;
            margin-top: 4px;
        }

        .info-card {
            margin-top: 7px;
            background: linear-gradient(180deg, var(--card) 0%, var(--card-2) 100%);
            border-radius: var(--radius);
            padding: 12px;
            padding-left: 10px;
            padding-right: 10px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255, 255, 255, 0.262);
        }

        .info-card h2 {
            font-size: 15px;
            font-weight: 700;
            margin: 0 0 15px 0;
            padding-bottom: 1px;
            display: flex;
            align-items: center;
            text-align: center;
            gap: 10px;
            color: var(--accent);
        }

        .info-card h2 .icon {
            width: 24px;
            height: 24px;
            flex-shrink: 0;
        }

        .info-card p,
        .info-card li {
            font-size: 14px;
            line-height: 1.6;
            color: var(--muted);
        }

        .info-card ul,
        .info-card ol {
            padding-left: 20px;
            margin: 10px 0;
        }

        .info-card li {
            margin-bottom: 10px;
        }

        .info-card strong {
            font-weight: 500;
            color: var(--text);
        }

        .info-card .unit-title {
            display: block;
            margin-bottom: 8px;
            font-size: 15px;
        }

        .outcomes-details {
            margin: 6px 0 12px 0;
            background: rgba(0, 0, 0, 0);
            border: 1px solid rgba(184, 183, 183, 0.5);
            border-radius: 10px;
            padding: 6px 10px;
            transition: background 0.3s ease;
        }

        .outcomes-details[open] {
            background: rgba(0, 0, 0, 0);
            padding-bottom: 0px;
            color: var(--text);
        }

        .outcomes-details summary {
            font-size: 12px;
            color: rgba(226, 226, 226, 0.7);
            cursor: pointer;
            font-weight: 500;
            user-select: none;
            outline: none;
        }

        .outcomes-list {
            margin-top: 8px !important;
            padding-left: 20px !important;
        }

        .outcomes-list li {
            font-size: 12px !important;
            color: #cae6e8 !important;
            margin-bottom: 4px !important;
            line-height: 1.4 !important;
            list-style-type: disc;
        }

        .reference-table {
            width: 100%;
            margin: 12px 0 0;
            border-collapse: collapse;
            color: var(--text);
            font-size: 13px;
        }

        .reference-table caption {
            margin-bottom: 8px;
            color: var(--accent);
            font-size: 15px;
            font-weight: 700;
            text-align: left;
        }

        .reference-table th,
        .reference-table td {
            border: 1px solid rgba(184, 183, 183, 0.5);
            padding: 8px 10px;
            vertical-align: top;
            text-align: left;
        }

        .reference-table th:first-child,
        .reference-table td:first-child {
            width: 72px;
            text-align: center;
        }

        .reference-table th:nth-child(2),
        .reference-table td:nth-child(2) {
            width: 28%;
        }

        .reference-table th:nth-child(3),
        .reference-table td:nth-child(3) {
            width: 25%;
        }

        .reference-table th {
            color: var(--accent);
            font-weight: 700;
        }

        .theory-card .unit-title {
            color: var(--accent-2);
            font-weight: 500;
        }

        .lab-card .unit-title {
            color: var(--accent);
            font-weight: 500;
        }

        .info-card .sub-heading {
            font-size: 14px;
            font-weight: 500;
            margin-top: 30px;
            margin-bottom: 15px;
            text-align: center;
        }

        .unit-topics {
            list-style-type: circle;
            padding-left: 20px;
            margin-top: 8px;
        }

        .unit-topics li {
            margin-bottom: 8px;
            font-size: 15px;
        }

        table {
            width: 100%;
            height: 100%;
            border-collapse: collapse;
            margin: 15px 0 0 0;
            font-size: 14px;
        }

        th,
        td {
            padding: 12px 10px;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, .1);
        }

        th {
            font-weight: 500;
            color: var(--muted);
            text-transform: uppercase;
            font-size: 11px;
        }

        thead th {
            text-align: center;
        }

        td {
            font-size: 10px;
        }

        td:not(:first-child),
        th:not(:first-child) {
            text-align: center;
        }

        tr:last-child td {
            border-bottom: none;
        }

        tr.theory-row td:first-child {
            border-left: 2px solid var(--accent-2);
            padding-left: 12px;
            font-weight: 500;
            color: var(--accent-2);
        }

        tr.lab-row td:first-child {
            border-left: 2px solid var(--accent);
            padding-left: 12px;
            color: var(--accent);
        }

        .total-row td {
            font-weight: 700;
            color: var(--accent-2);
            border-top: 1px solid rgba(255, 255, 255, 0.2);
        }

        .syllabus-tabs {
            display: grid;
            grid-template-columns: repeat(auto-fit);
            gap: 8px;
        }

        .tab-btn {
            padding: 5px;
            padding-left: 7px;
            border: 1px solid rgba(255, 255, 255, .15);
            background: transparent;
            color: var(--text);
            font-family: inherit;
            font-size: 12px;
            font-weight: 700;
            border-radius: 7px;
            cursor: pointer;
            transition: all .2s ease;
            background-color: var(--chip);
        }

        .tab-btn:hover {
            background-color: #2a4c8a;
        }

        .tab-btn.active.theory-active {
            background: linear-gradient(135deg, var(--accent-2), #ffb700);
            color: #001a33;
            border-color: var(--accent-2);
            box-shadow: 0 4px 15px rgba(255, 213, 74, 0.2);
        }

        .tab-btn.active.lab-active {
            background: linear-gradient(135deg, var(--accent), #51ffb4);
            color: #001a33;
            border-color: var(--accent);
            box-shadow: 0 4px 15px rgba(0, 238, 255, 0.2);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        #syllabus-content .subject-card>h2 {
            display: block !important;
        }

        .theory-heading {
            color: var(--accent-2);
        }

        .lab-heading {
            color: var(--accent);
        }

        #credits-toggle {
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            margin-bottom: 0;
        }

        #credits-toggle .chevron-icon {
            width: 20px;
            height: 20px;
            transition: transform 0.3s ease;
            stroke: var(--accent);
        }

        #credits-toggle.active .chevron-icon {
            transform: rotate(180deg);
        }

        #credits-table-container {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease-out;
        }

        #credits-table-container.expanded {
            max-height: 1000px;
            transition: max-height 0.2s ease-in;
        }

        .search-youtube-button {
            background: rgba(255, 0, 0, 0.068);
            color: rgb(255, 39, 39);
            border: 1px solid rgba(255, 0, 0, 0.664);
            border-radius: 4px;
            padding: 2px 5px;
            padding-top: 1px;
            font-size: 10px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            flex-shrink: 0;
            white-space: nowrap;
            font-family: inherit;
            margin-left: 3px;
        }

        .ask-ai-topic-button {
            background: linear-gradient(135deg, rgba(0, 238, 255, .1), rgba(0, 238, 255, .07));
            color: var(--accent);
            border: 1px solid rgba(0, 238, 255, .25);
            border-radius: 4px;
            padding: 2px 5px;
            padding-top: 1px;
            font-size: 10px;
            font-weight: 400;
            cursor: pointer;
            transition: all 0.2s ease;
            flex-shrink: 0;
            white-space: nowrap;
            font-family: inherit;
        }

        * {
            -webkit-tap-highlight-color: transparent;
        }

        #goToTopBtn {
            position: fixed;
            bottom: 30px;
            right: 20px;
            z-index: 999;
            width: 50px;
            height: 50px;
            background-color: #3333338e;
            color: rgb(0, 217, 255);
            border: none;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out, background-color 0.3s;
        }

        #goToTopBtn:hover {
            background-color: #555;
        }

        #goToTopBtn.show {
            opacity: 1;
            visibility: visible;
        }

        .mark-complete-button {
            background: rgba(0, 255, 13, 0.068);
            color: rgba(39, 255, 64, 0.802);
            border: 1px solid rgba(0, 255, 60, 0.544);
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s ease;
            flex-shrink: 0;
            font-family: inherit;
            margin-left: 3px;
            padding: 2px 5px;
            padding-top: 1px;
            font-size: 10px;
            font-weight: 400;
            white-space: nowrap;
        }

        .unit-topics>li.topic-completed,
        .lab-card>ol>li.topic-completed,
        .lab-card>ul>li.topic-completed {
            opacity: 0.2;
        }

        .topic-completed .mark-complete-button {
            background: rgb(0, 255, 30);
            color: #000000;
            border-color: rgb(0, 255, 0);
        }