:root {
    --ok: #1e8449;
    --warn: #b9770e;
    --bad: #922b21;
    --violet: #6c5ce7;
}

.class-page header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 3.2rem 1rem 2.4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.class-page header::after {
    content: "";
    position: absolute;
    inset: -40px;
    background:
        radial-gradient(circle at 20% 10%, rgba(255, 255, 255, 0.18), transparent 40%),
        radial-gradient(circle at 80% 30%, rgba(255, 255, 255, 0.12), transparent 45%),
        radial-gradient(circle at 50% 90%, rgba(255, 255, 255, 0.10), transparent 55%);
    pointer-events: none;
}

.class-page .hero-header {
    padding: 0;
    text-align: left;
}

.class-page .hero-header::after {
    display: none;
}

.class-page .hero-header .container {
    margin: 0 auto;
    padding: 0 1.5rem;
}

.class-page .hero-header .topnav {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
}

.home-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    color: #ffffff;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    transition: 0.2s ease;
}

.home-button:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.home-button svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
}

.class-page header h1,
.class-page header p,
.anchorbar {
    position: relative;
    z-index: 1;
}

.class-page header h1 {
    margin: 0 0 0.4rem;
    font-size: 2.2rem;
    letter-spacing: 0.2px;
}

.class-page header p {
    margin: 0.2rem 0;
    opacity: 0.97;
}

.subtitle {
    font-size: 1.05rem;
}

.class-page .container {
    max-width: 1080px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.class-page section {
    background: white;
    padding: 2.6rem;
    margin-bottom: 2rem;
    border-radius: 14px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(15, 23, 42, 0.06);
}

.class-page h2 {
    color: var(--primary-color);
    border-left: 6px solid var(--highlight);
    padding-left: 14px;
    margin-top: 0;
    font-size: 1.6rem;
}

.class-page h3 {
    color: var(--secondary-color);
    margin: 1.4rem 0 0.55rem;
    font-size: 1.22rem;
}

.big {
    font-size: 1.18rem;
}

.anchorbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 14px;
}

.anchorbar a {
    color: white;
    text-decoration: none;
    padding: 9px 12px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.08);
    transition: transform 0.15s ease, background 0.15s ease;
    font-weight: 800;
    font-size: 0.92rem;
}

.anchorbar a:hover {
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.16);
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 18px;
    margin-top: 18px;
}

.card {
    background: var(--accent-color);
    padding: 1.35rem;
    border-radius: 12px;
    transition: transform 0.22s ease, box-shadow 0.22s ease;
    border: 1px solid rgba(0, 0, 0, 0.06);
    position: relative;
    overflow-x: auto;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.card h3 {
    margin-top: 0;
}

.hoverline {
    position: absolute;
    left: 0;
    top: 0;
    height: 4px;
    width: 100%;
    background: linear-gradient(90deg, var(--highlight), rgba(230, 126, 34, 0.15));
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.22s ease, transform 0.22s ease;
}

.card:hover .hoverline {
    opacity: 1;
    transform: translateY(0);
}

.pill {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(41, 128, 185, 0.12);
    color: var(--secondary-color);
    font-weight: 800;
    font-size: 0.85rem;
    margin: 0.15rem 0.25rem 0.15rem 0;
}

.pill.violet {
    background: rgba(108, 92, 231, 0.12);
    color: var(--violet);
}

.pill.orange {
    background: rgba(230, 126, 34, 0.12);
    color: var(--highlight);
}

.extra-info {
    background-color: #fff3e0;
    border-left: 6px solid #ff9800;
    padding: 14px 16px;
    margin: 18px 0;
    font-size: 0.98rem;
    border-radius: 10px;
}

.callout {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-left: 5px solid #f59e0b;
    padding: 16px;
    border-radius: 8px;
    margin: 16px 0;
}

.stepbox {
    background: linear-gradient(180deg, #fbfcfe, #f7fbff);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    padding: 14px 16px;
    margin: 12px 0;
}

.mono-block {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    background: rgba(15, 23, 42, 0.04);
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 12px;
    padding: 14px;
    overflow-x: auto;
    margin: 16px 0;
    white-space: pre-wrap;
}

.class-page code {
    background: rgba(41, 128, 185, 0.1);
    color: var(--primary-color);
    padding: 2px 5px;
    border-radius: 5px;
    font-weight: 700;
}

.table-wrap {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 12px;
}

.table-wrap table {
    width: 100%;
    min-width: 760px;
    border-collapse: collapse;
}

.class-page table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0;
    overflow: hidden;
    border-radius: 12px;
}

.class-page th,
.class-page td {
    padding: 12px;
    border: 1px solid #e6e6e6;
    text-align: left;
    vertical-align: top;
}

.class-page th {
    background-color: var(--primary-color);
    color: white;
}

.class-page ul li,
.class-page ol li {
    margin: 0.45rem 0;
}

.quiz {
    background: #f7faff;
    border: 1px solid rgba(41, 128, 185, 0.18);
    border-radius: 14px;
    padding: 18px;
    margin-top: 12px;
}

.quiz .q {
    padding: 12px 0;
    border-top: 1px dashed rgba(0, 0, 0, 0.12);
}

.quiz .q:first-child {
    border-top: none;
}

.quiz label {
    display: block;
    margin: 6px 0;
    cursor: pointer;
}

.btn-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
    align-items: center;
}

.class-page .btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 800;
    transition: transform 0.15s ease, opacity 0.15s ease;
    text-decoration: none;
    display: inline-block;
}

.class-page .btn:hover {
    transform: translateY(-1px);
    opacity: 0.95;
}

.class-page .btn.ghost {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid rgba(26, 82, 118, 0.25);
}

.result {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    display: none;
    font-weight: 900;
}

.result.ok {
    background: rgba(30, 132, 73, 0.12);
    color: var(--ok);
    display: block;
}

.result.warn {
    background: rgba(185, 119, 14, 0.12);
    color: var(--warn);
    display: block;
}

.result.bad {
    background: rgba(146, 43, 33, 0.12);
    color: var(--bad);
    display: block;
}

.class-page footer {
    text-align: center;
    padding: 2rem;
    color: #7f8c8d;
    font-size: 0.95rem;
}

.preview-box {
    border: 1px dashed rgba(41, 128, 185, 0.45);
    background: #f7faff;
    border-radius: 14px;
    padding: 18px;
    margin: 16px 0;
}

.demo-page {
    background: white;
    border-radius: 12px;
    border: 1px solid rgba(15, 23, 42, 0.12);
    overflow: hidden;
}

.demo-page header {
    background: linear-gradient(135deg, #1a5276, #2980b9);
    color: white;
    padding: 1.3rem;
    text-align: left;
}

.demo-page header::after {
    display: none;
}

.demo-page nav {
    background: #ecf0f1;
    padding: 0.8rem 1rem;
}

.demo-page nav a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 800;
    margin-right: 12px;
}

.demo-page main {
    padding: 1rem;
}

.demo-page article {
    background: #f8fbff;
    border: 1px solid rgba(41, 128, 185, 0.16);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.demo-page footer {
    background: #0f172a;
    color: #cbd5e1;
    text-align: center;
    padding: 1rem;
}

.style-demo {
    background: #ffffff;
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 14px;
    padding: 18px;
    margin-top: 14px;
}

.tarjeta-demo {
    background: #ecf0f1;
    border-left: 6px solid #e67e22;
    padding: 18px;
    border-radius: 12px;
}

.tarjeta-demo h4 {
    margin: 0 0 8px;
    color: #1a5276;
}

.boton-demo {
    display: inline-block;
    margin-top: 10px;
    padding: 9px 14px;
    background: #1a5276;
    color: white;
    border-radius: 9px;
    text-decoration: none;
    font-weight: 900;
}

.demo-title {
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.flex-demo {
    background: #f7faff;
    border: 1px dashed rgba(41, 128, 185, 0.45);
    border-radius: 14px;
    padding: 16px;
    margin: 16px 0;
    display: flex;
    gap: 12px;
}

.demo-box {
    background: linear-gradient(135deg, #2980b9, #6c5ce7);
    color: white;
    border-radius: 12px;
    padding: 16px;
    min-width: 70px;
    text-align: center;
    font-weight: 900;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
}

.demo-row {
    flex-direction: row;
}

.demo-column {
    flex-direction: column;
}

.demo-center {
    justify-content: center;
    align-items: center;
    min-height: 160px;
}

.demo-between {
    justify-content: space-between;
}

.demo-wrap {
    flex-wrap: wrap;
}

.demo-wrap .demo-box {
    flex: 1 1 180px;
}

.layout-example {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    margin-top: 18px;
}

.layout-main {
    flex: 2 1 420px;
    background: #f8fbff;
    border: 1px solid rgba(41, 128, 185, 0.18);
    border-radius: 14px;
    padding: 20px;
}

.layout-aside {
    flex: 1 1 240px;
    background: #fff3e0;
    border: 1px solid rgba(230, 126, 34, 0.18);
    border-radius: 14px;
    padding: 20px;
}

.mini-navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    background: #f8fbff;
    border: 1px solid rgba(41, 128, 185, 0.18);
    padding: 16px;
    border-radius: 14px;
    margin-top: 14px;
}

.mini-navbar strong {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.mini-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.mini-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 900;
}

.profile-card {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    background: #f8fbff;
    border: 1px solid rgba(41, 128, 185, 0.18);
    border-radius: 14px;
    padding: 18px;
    margin-top: 14px;
}

.avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--highlight), var(--violet));
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: 900;
    font-size: 1.4rem;
    flex: 0 0 auto;
}

.profile-info {
    flex: 1 1 240px;
}

.profile-info h4 {
    margin: 0 0 4px;
    color: var(--primary-color);
    font-size: 1.15rem;
}

.profile-info p {
    margin: 0;
}

.embed-frame {
    position: relative;
    width: 100%;
    height: 0;
    padding-top: 56.25%;
    padding-bottom: 0;
    box-shadow: 0 2px 8px 0 rgba(63, 69, 81, 0.16);
    margin-top: 1.6em;
    margin-bottom: 0.9em;
    overflow: hidden;
    border-radius: 8px;
    will-change: transform;
}

.embed-frame iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border: none;
    padding: 0;
    margin: 0;
}

@media (max-width: 768px) {
    .class-page header h1 {
        font-size: 1.8rem;
    }

    .class-page section {
        padding: 1.5rem;
    }

    .table-wrap table {
        min-width: 640px;
    }

    .flex-demo {
        overflow-x: auto;
    }
}

/* ── Section heading & icon badges (clases 6–10) ─────────────── */

.section-heading {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.icon-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    flex: 0 0 auto;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.icon-badge svg {
    width: 20px;
    height: 20px;
    display: block;
}

.icon-badge.js {
    background: linear-gradient(135deg, #f7df1e, #f1c40f);
    color: #111111;
}

.icon-badge.java {
    background: linear-gradient(135deg, #ffe8cc, #ffd59e);
    color: #8e4b10;
}

.icon-badge.ts {
    background: linear-gradient(135deg, #3178c6, #235a97);
    color: white;
}

.icon-badge.question {
    background: linear-gradient(135deg, #1a5276, #2980b9);
    color: white;
}

.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    margin-bottom: 10px;
    color: white;
}

.card-icon svg {
    width: 20px;
    height: 20px;
}

/* ── Code display (clases 8–10) ───────────────────────────────── */

.code-block {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 12px;
    padding: 16px;
    font-family: Consolas, "Courier New", monospace;
    overflow-x: auto;
    margin: 16px 0;
    border: 1px solid rgba(59, 130, 246, 0.2);
    line-height: 1.55;
}

.example-output {
    background: #ffffff;
    border: 1px solid rgba(26, 82, 118, 0.16);
    border-left: 5px solid #1a5276;
    border-radius: 12px;
    padding: 14px 16px;
    margin: -4px 0 24px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
}

.example-output h4 {
    margin: 0 0 8px;
    color: #1a5276;
    font-size: 1rem;
}

.example-output pre {
    margin: 0;
    white-space: pre-wrap;
    font-family: Consolas, "Courier New", monospace;
    color: #0f172a;
}

.code-inline {
    background: #f0f4f8;
    color: #1a5276;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: Consolas, monospace;
}

/* ── Demo components (clases 7–10) ────────────────────────────── */

.demo-section {
    background: linear-gradient(135deg, #f5f7fa, #e0f2fe);
    border: 1px solid rgba(41, 128, 185, 0.14);
    border-radius: 16px;
    padding: 22px;
    margin: 18px 0 28px;
}

.demo-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.demo-button {
    border: none;
    border-radius: 10px;
    padding: 10px 16px;
    font-weight: 800;
    cursor: pointer;
    background: #1a5276;
    color: white;
    transition: all 0.2s ease;
}

.demo-button:hover {
    background: #154360;
    transform: translateY(-1px);
}

.demo-input {
    border: 2px solid #dbeafe;
    border-radius: 10px;
    padding: 10px 12px;
    min-width: 180px;
    font-size: 1rem;
    outline: none;
}

.demo-input:focus {
    border-color: #1a5276;
    box-shadow: 0 0 0 3px rgba(26, 82, 118, 0.12);
}

.demo-output {
    margin-top: 16px;
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 12px;
    padding: 16px;
    font-family: Consolas, "Courier New", monospace;
    min-height: 60px;
    white-space: pre-wrap;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* ── Tags (clases 7–10) ───────────────────────────────────────── */

.tag-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 14px 0 0;
}

.tag-pill {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    background: #eff6ff;
    color: #1e3a8a;
    font-size: 0.92rem;
    font-weight: 700;
    border: 1px solid rgba(59, 130, 246, 0.18);
}

/* ── Comparison table (clases 8–10) ───────────────────────────── */

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    border-radius: 10px;
    overflow: hidden;
}

.comparison-table thead {
    background: #1a5276;
    color: white;
}

.comparison-table th,
.comparison-table td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.comparison-table tbody tr:nth-child(odd) {
    background: #f8f9fa;
}

.comparison-table tbody tr:hover {
    background: #e8f1f8;
}

/* ── Quiz system (clases 5–10) ────────────────────────────────── */

.quiz-container {
    background: linear-gradient(135deg, #f5f7fa, #dbeafe);
    padding: 30px;
    border-radius: 14px;
    margin-top: 28px;
    border: 1px solid rgba(41, 128, 185, 0.14);
}

.question-box {
    background: white;
    padding: 20px;
    margin: 18px 0;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.option-label {
    display: block;
    padding: 10px 12px;
    margin: 8px 0;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid #e5e7eb;
    transition: all 0.2s ease;
}

.option-label:hover {
    background-color: #f8fafc;
    border-color: #1a5276;
}

.option-label input[type="radio"] {
    margin-right: 10px;
}

.feedback {
    margin-top: 10px;
    padding: 12px;
    border-radius: 8px;
    display: none;
    font-weight: 600;
}

.feedback.correct {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.feedback.incorrect {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.score-display {
    background: linear-gradient(135deg, #1a5276, #2980b9);
    color: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    margin-top: 22px;
    display: none;
    font-size: 1.05rem;
    font-weight: 700;
}

.score-display.show {
    display: block;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 18px;
    flex-wrap: wrap;
}

.btn-custom {
    padding: 10px 18px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 800;
    transition: all 0.2s ease;
}

.btn-submit {
    background-color: #28a745;
    color: white;
}

.btn-submit:hover {
    background-color: #218838;
}

.btn-reset {
    background-color: #6c757d;
    color: white;
}

.btn-reset:hover {
    background-color: #5a6268;
}