/* =========================================================
   itechnicalearning — main stylesheet
   Theme: Modern E-Learning Accent (white + charcoal + gold)
   ---------------------------------------------------------
   1. Design tokens (colours, spacing, fonts)
   2. Base / reset
   3. Layout helpers
   4. Buttons
   5. Navbar
   6. Hero
   7. Sections & cards
   8. Stats, CTA
   9. Footer
   10. Responsive (tablet / mobile)
   ========================================================= */


/* ---------- 1. Design tokens ---------- */
:root {
    /* Primary brand / CTA (gold) */
    --primary: #FFB200;
    --primary-hover: #E59E00;
    --primary-light: #FFF4D6;
    /* Darker gold for SMALL text on white — #FFB200 is too light to read */
    --primary-text: #8F5F00;

    /* Backgrounds */
    --background: #FFFFFF;
    --background-soft: #F7F8FA;
    --background-alt: #F3F4F6;

    /* Text */
    --text-primary: #1F2937;
    --text-secondary: #64748B;
    --text-dark: #111827;

    /* Surfaces */
    --surface: #FFFFFF;
    --border: #E5E7EB;
    --border-strong: #D1D5DB;

    /* Dark section (footer, code block) */
    --dark-section: #172033;
    --dark-section-light: #243047;
    --dark-text: #CBD5E1;

    /* Status */
    --success: #16A34A;
    --danger: #DC2626;
    --youtube-red: #FF0000;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 48px rgba(15, 23, 42, 0.12);

    /* Font, sizes */
    --font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 20px;
    --container-width: 1200px;
    --header-height: 72px;
}


/* ---------- 2. Base / reset ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.65;
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    margin: 0 0 0.5em;
    color: var(--text-dark);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: 3.4rem; font-weight: 800; }
h2 { font-size: 2.1rem; }
h3 { font-size: 1.15rem; }

p {
    margin: 0 0 1em;
}

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

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

button,
input,
select {
    font-family: inherit;
}

/* Elements hidden by JavaScript (e.g. filtered-out course cards) */
[hidden] {
    display: none !important;
}

/* Gold "highlighter" stroke behind an important word (text stays dark) */
.highlight {
    background: linear-gradient(transparent 62%, var(--primary) 62%, var(--primary) 90%, transparent 90%);
    padding: 0 4px;
    margin: 0 -4px;
}


/* ---------- 3. Layout helpers ---------- */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 88px 0;
}

.section-soft,
.section-alt {
    background: var(--background-soft);
}

.section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 40px;
}

.section-head p {
    margin: 0;
    color: var(--text-secondary);
}

/* Small label above headings: dark text with a gold dash */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.eyebrow::before {
    content: "";
    width: 20px;
    height: 3px;
    border-radius: 2px;
    background: var(--primary);
}

.grid {
    display: grid;
    gap: 24px;
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}


/* ---------- 4. Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.btn-lg {
    padding: 14px 26px;
    font-size: 1rem;
}

/* Primary: gold with dark text */
.btn-primary {
    background: var(--primary);
    color: var(--text-dark);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(255, 178, 0, 0.25);
}

/* Secondary: white with grey border */
.btn-outline {
    background: var(--surface);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

/* Login button (white / outlined) */
.btn-ghost {
    background: var(--surface);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.btn-ghost:hover {
    border-color: var(--text-primary);
}

/* Dark button — used on the gold CTA banner */
.btn-dark {
    background: var(--text-dark);
    color: #fff;
}

.btn-dark:hover {
    background: var(--dark-section-light);
}

/* Outlined button on a gold background */
.btn-on-gold {
    border-color: rgba(17, 24, 39, 0.35);
    color: var(--text-dark);
}

.btn-on-gold:hover {
    border-color: var(--text-dark);
    background: rgba(255, 255, 255, 0.25);
}


/* ---------- 5. Navbar ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* The iTechnica logo in the navbar (images/brand/itechnica-logo.webp) */
.logo-img {
    display: block;
    width: auto;
    height: 44px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 0;
    border-radius: var(--radius-sm);
    background: none;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary-hover);
}

.nav-link.active {
    font-weight: 700;
    color: var(--text-dark);
}

/* Gold underline under the active page */
.nav-link.active::after {
    content: "";
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: -2px;
    height: 3px;
    border-radius: 2px;
    background: var(--primary);
}

.caret {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Dropdown menus */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 210px;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
}

.dropdown-menu a {
    display: block;
    padding: 9px 12px;
    border-left: 3px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.93rem;
    color: var(--text-primary);
}

.dropdown-menu a:hover {
    background: var(--primary-light);
    border-left-color: var(--primary);
    color: var(--text-dark);
}

/* "open" is added by app.js when the dropdown is clicked */
.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown.open .caret {
    transform: rotate(180deg);
}

/* Mobile menu button (hidden on desktop) */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    padding: 0 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}


/* ---------- 6. Hero ---------- */
.hero {
    position: relative;
    overflow: hidden;
    padding: 80px 0 72px;
    background: var(--background);
}

/* Subtle light-grey decorative shapes */
.hero::before {
    content: "";
    position: absolute;
    top: -140px;
    right: -120px;
    width: 560px;
    height: 560px;
    border-radius: 50%;
    background: var(--background-alt);
}

.hero::after {
    content: "";
    position: absolute;
    bottom: 40px;
    left: 44%;
    width: 140px;
    height: 100px;
    background-image: radial-gradient(var(--border-strong) 1.5px, transparent 1.5px);
    background-size: 14px 14px;
    opacity: 0.8;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
    gap: 56px;
}

.hero-lead {
    max-width: 520px;
    margin: 20px 0 32px;
    font-size: 1.15rem;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    margin-top: 32px;
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.hero-points li::before {
    content: "\2713";
    margin-right: 8px;
    color: var(--success);
    font-weight: 700;
}

/* Hero visual — a mock "lesson" card made with HTML/CSS */
.hero-visual {
    position: relative;
    padding: 52px 24px 52px;
}

/* Soft gold square behind the card */
.hero-visual::before {
    content: "";
    position: absolute;
    top: 30px;
    right: 6px;
    width: 180px;
    height: 180px;
    border-radius: 28px;
    background: var(--primary-light);
}

.mock-card {
    position: relative;
    z-index: 1;
    max-width: 440px;
    margin: 0 auto;
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.mock-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.mock-header h4 {
    margin: 2px 0 0;
    font-size: 1.15rem;
}

.mock-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary-text);
}

.mock-pill {
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--background-alt);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.mock-lessons li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 0;
    font-size: 0.92rem;
    color: var(--text-secondary);
    border-bottom: 1px dashed var(--border);
}

.mock-lessons li:last-child {
    border-bottom: 0;
}

.mock-lessons .check {
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--background-alt);
    font-size: 0.72rem;
    font-weight: 700;
}

.mock-lessons li.done {
    color: var(--text-primary);
}

.mock-lessons li.done .check {
    background: #DCFCE7;
    color: var(--success);
}

.mock-lessons li.current {
    margin: 0 -10px;
    padding-left: 10px;
    padding-right: 10px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    border-bottom-color: transparent;
    color: var(--text-dark);
    font-weight: 600;
}

.mock-lessons li.current .check {
    background: var(--primary);
    color: var(--text-dark);
}

.mock-progress {
    margin-top: 18px;
}

.mock-progress-top {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.mock-progress-top strong {
    color: var(--text-dark);
}

.progress-bar {
    height: 8px;
    background: var(--background-alt);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar span {
    display: block;
    height: 100%;
    background: var(--primary);
    border-radius: 999px;
}

.mock-code {
    display: flex;
    flex-direction: column;
    margin-top: 20px;
    padding: 14px 16px;
    background: var(--dark-section);
    border-radius: var(--radius);
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.85rem;
    color: #E2E8F0;
}

.code-comment { color: #8391A7; }
.code-key { color: #FFFFFF; }
.code-num { color: var(--primary); }

/* Small floating badges around the mock card */
.floating-badge {
    position: absolute;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.floating-badge strong {
    display: block;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.floating-badge span {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.badge-score {
    top: 0;
    right: 0;
}

.badge-icon {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: #DCFCE7;
    color: var(--success) !important;
    font-weight: 800;
    font-size: 1rem !important;
}

.badge-code {
    bottom: 0;
    left: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    border-left: 4px solid var(--primary);
}

.badge-code strong {
    font-family: Consolas, "Courier New", monospace;
    letter-spacing: 0.02em;
}


/* ---------- 7. Sections & cards ---------- */

/* Learn → Practice → Assess → Grow (white cards on soft grey) */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.step {
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.step-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}

.step-icon {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    color: var(--primary-hover);
}

.step-icon svg {
    width: 24px;
    height: 24px;
}

.step-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--border-strong);
}

.step h3 {
    margin-bottom: 6px;
}

.step p {
    margin: 0;
    font-size: 0.93rem;
    color: var(--text-secondary);
}

/* Base card */
.card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

/* Track card */
.track-card {
    padding: 28px;
}

.track-card p {
    flex-grow: 1;
    font-size: 0.93rem;
    color: var(--text-secondary);
}

/* A track that is not open yet: greyed out, not clickable */
.track-card.is-soon {
    position: relative;
    background: var(--background-soft);
    box-shadow: none;
    cursor: default;
}

.track-card.is-soon:hover {
    border-color: var(--border);
    box-shadow: none;
    transform: none;
}

.track-card.is-soon .track-icon,
.track-card.is-soon h3,
.track-card.is-soon p {
    opacity: 0.6;
}

.soon-tag {
    position: absolute;
    top: 18px;
    right: 18px;
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--text-dark);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #fff;
}

.track-icon {
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    margin-bottom: 20px;
    border-radius: 14px;
    font-size: 0.85rem;
    font-weight: 800;
}

.track-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.track-meta .dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: currentColor;
}

/* "View track →" — dark gold text, gold underline on hover */
.card-link {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-text);
}

.card:hover .card-link {
    color: var(--text-dark);
    text-decoration: underline;
    text-decoration-color: var(--primary);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
}

/* Soft tinted icon backgrounds — restrained, one per track */
.color-amber  { background: #FFF4D6; color: #8F5F00; }  /* gold   */
.color-blue   { background: #EAF1FE; color: #2F5BB8; }  /* blue   */
.color-green  { background: #E7F6EC; color: #1C7A3E; }  /* green  */
.color-purple { background: #F1ECFB; color: #6440B0; }  /* purple */
.color-rose   { background: #FDECEC; color: #B4323A; }  /* red    */
.color-teal   { background: #FFEEDF; color: #A4500F; }  /* orange */

/* Article card */
.article-card {
    padding: 28px;
}

.article-card h3 {
    font-size: 1.25rem;
}

.article-card:hover h3 {
    color: var(--text-primary);
}

.article-card p {
    flex-grow: 1;
    font-size: 0.93rem;
    color: var(--text-secondary);
}

.tag {
    align-self: flex-start;
    margin-bottom: 14px;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--primary-light);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-text);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
}

.article-meta strong {
    display: block;
    color: var(--text-dark);
}

.article-meta span {
    color: var(--text-secondary);
}

.avatar {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--background-alt);
    border: 2px solid var(--primary);
    color: var(--text-dark) !important;
    font-weight: 700;
}

/* Video card */
.video-card {
    overflow: hidden;
}

.video-thumb {
    position: relative;
    display: grid;
    place-items: center;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--dark-section);
}

/* Real YouTube thumbnail behind the play button */
.video-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.video-card:hover .video-thumb img {
    transform: scale(1.04);
}

.video-thumb .play-button {
    position: relative;
}

/* YouTube-style red play button (kept red on purpose) */
.play-button {
    display: grid;
    place-items: center;
    width: 64px;
    height: 44px;
    padding-left: 3px;
    border-radius: 12px;
    background: var(--youtube-red);
    color: #fff;
    box-shadow: var(--shadow-md);
    font-size: 1rem;
    transition: transform 0.2s;
}

.video-card:hover .play-button {
    transform: scale(1.08);
}

.video-duration {
    position: absolute;
    right: 12px;
    bottom: 12px;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(17, 24, 39, 0.85);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
}

.video-body {
    padding: 20px 22px 22px;
}

.video-topic {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary-text);
}

.video-body h3 {
    display: -webkit-box;
    margin: 6px 0 8px;
    overflow: hidden;
    font-size: 1.05rem;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.video-views {
    font-size: 0.85rem;
    color: var(--text-secondary);
}


/* ---------- 8. Stats, CTA ---------- */

/* Statistics: one clean white card with four items */
.stats-section {
    padding: 16px 0 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 32px 28px;
    border-right: 1px solid var(--border);
}

.stat:last-child {
    border-right: 0;
}

.stat-icon {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--primary-light);
    color: var(--primary-hover);
}

.stat-icon svg {
    width: 26px;
    height: 26px;
}

.stat strong {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-dark);
    letter-spacing: -0.02em;
}

.stat span {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

/* Call to action: gold banner, dark text */
.cta {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 56px;
    border-radius: var(--radius-lg);
    background: var(--primary);
    color: var(--text-dark);
}

/* Subtle decorative circles */
.cta::before,
.cta::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.35);
}

.cta::before {
    width: 260px;
    height: 260px;
    top: -150px;
    right: -40px;
}

.cta::after {
    width: 160px;
    height: 160px;
    bottom: -90px;
    right: -30px;
    background: rgba(255, 255, 255, 0.15);
    border: 0;
}

.cta > div {
    position: relative;
    z-index: 1;
}

.cta h2 {
    color: var(--text-dark);
}

.cta p {
    max-width: 520px;
    margin: 0;
    color: var(--text-primary);
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}


/* ---------- 9. Footer ---------- */
.site-footer {
    padding-top: 64px;
    background: var(--dark-section);
    color: var(--dark-text);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
}

.footer-tagline {
    margin: 16px 0 8px;
    font-weight: 600;
    color: var(--primary);
}

.footer-about {
    max-width: 320px;
    font-size: 0.92rem;
}

.footer-col h4 {
    margin-bottom: 16px;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--primary);
}

.footer-col li {
    margin-bottom: 10px;
}

.footer-col a {
    font-size: 0.92rem;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: 24px;
    padding-bottom: 24px;
    border-top: 1px solid var(--dark-section-light);
    font-size: 0.88rem;
}

.footer-bottom p {
    margin: 0;
}


/* ---------- 10. Responsive ---------- */

/* Laptop / small desktop (up to 1100px) */
@media (max-width: 1100px) {
    h1 { font-size: 2.9rem; }
    .nav-menu { gap: 16px; }
    .nav-link { padding: 8px 10px; }
    .nav-link.active::after { left: 10px; right: 10px; }
    .stat { padding: 28px 20px; }
}

/* Tablet (up to 960px): switch to the mobile menu */
@media (max-width: 960px) {
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
        padding: 16px 24px 24px;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        display: none;
    }

    /* "menu-open" is added by app.js */
    .site-header.menu-open .nav-menu {
        display: flex;
    }

    .site-header.menu-open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .site-header.menu-open .menu-toggle span:nth-child(2) { opacity: 0; }
    .site-header.menu-open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .nav-links {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .nav-link {
        width: 100%;
        min-height: 48px;
        justify-content: space-between;
        padding: 12px 14px;
        border-left: 3px solid transparent;
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        font-size: 1rem;
    }

    /* Mobile: active item gets a gold side bar instead of an underline */
    .nav-link.active {
        border-left-color: var(--primary);
        background: var(--primary-light);
    }

    .nav-link.active::after {
        display: none;
    }

    .dropdown-menu {
        position: static;
        display: none;
        min-width: 0;
        padding: 0 0 8px 14px;
        border: 0;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .dropdown-menu a {
        padding: 12px;
    }

    .dropdown.open .dropdown-menu {
        display: block;
    }

    .nav-actions {
        padding-top: 16px;
        border-top: 1px solid var(--border);
    }

    .nav-actions .btn {
        flex: 1;
        min-height: 46px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero::after {
        display: none;
    }

    .hero-visual {
        max-width: 520px;
        width: 100%;
        margin: 0 auto;
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat:nth-child(2) { border-right: 0; }
    .stat:nth-child(1),
    .stat:nth-child(2) { border-bottom: 1px solid var(--border); }

    .cta {
        flex-direction: column;
        align-items: flex-start;
        padding: 40px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* Mobile (up to 640px) */
@media (max-width: 640px) {
    h1 { font-size: 2.3rem; }
    h2 { font-size: 1.7rem; }

    .container {
        padding: 0 16px;
    }

    .nav-menu {
        padding: 16px;
    }


    .section {
        padding: 64px 0;
    }

    .hero {
        padding: 48px 0;
    }

    .hero::before {
        width: 360px;
        height: 360px;
        top: auto;
        bottom: 80px;
        right: -180px;
    }

    .hero-lead {
        font-size: 1.05rem;
    }

    .hero-buttons .btn {
        flex: 1;
    }

    .hero-visual {
        padding: 48px 0 48px;
    }

    .hero-visual::before {
        right: -10px;
        width: 140px;
        height: 140px;
    }

    .mock-card {
        padding: 18px;
    }

    .section-head {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 28px;
    }

    .grid-3,
    .steps {
        grid-template-columns: 1fr;
    }

    .stat {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 22px 18px;
    }

    .stat strong {
        font-size: 1.6rem;
    }

    .stat-icon {
        width: 44px;
        height: 44px;
    }

    .cta {
        padding: 32px 24px;
    }

    .cta-buttons,
    .cta-buttons .btn {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Very small phones (up to 380px) */
@media (max-width: 380px) {
    .logo-img {
        height: 36px;
    }


    .floating-badge {
        padding: 10px 12px;
    }
}


/* =========================================================
   11. LEARNING PAGES (Phase 2)
   Tracks, track detail, courses, course detail, lesson
   ========================================================= */

/* ---------- Shared page header ---------- */
.page-header {
    padding: 40px 0 56px;
    background: var(--background-soft);
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 2.6rem;
}

.page-lead {
    max-width: 640px;
    margin: 0;
    font-size: 1.08rem;
    color: var(--text-secondary);
}

.section-top-tight {
    padding-top: 48px;
}

.container-narrow {
    max-width: 880px;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 28px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--text-dark);
    text-decoration: underline;
    text-decoration-color: var(--primary);
    text-underline-offset: 3px;
}

.breadcrumb [aria-current] {
    color: var(--text-dark);
    font-weight: 600;
}

.breadcrumb-sep {
    color: var(--border-strong);
}

/* ---------- Tracks index: Track → Courses → ... flow ---------- */
.path-flow {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 28px 0 0;
    padding: 0;
    list-style: none;
}

.path-flow li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px 6px 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
}

.path-flow span {
    display: grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary-light);
    font-size: 0.78rem;
    color: var(--primary-text);
}

/* ---------- Detail header (track + course) ---------- */
.detail-header {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 48px;
    align-items: start;
}

.detail-title {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 16px;
}

.detail-title .track-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    margin: 0;
    font-size: 1rem;
}

.detail-title .eyebrow {
    margin-bottom: 4px;
}

.detail-title h1 {
    margin: 0;
}

.detail-main .hero-buttons {
    margin-top: 28px;
}

.fact-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 28px;
    margin-top: 24px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.fact-list strong {
    color: var(--text-dark);
}

/* White card on the right side */
.side-card {
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.side-card h3 {
    margin-bottom: 16px;
}

.side-card h4 {
    margin: 24px 0 12px;
    font-size: 0.95rem;
}

/* Lists with gold check marks */
.check-list li {
    position: relative;
    padding: 6px 0 6px 32px;
    font-size: 0.95rem;
}

.check-list li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    top: 7px;
    display: grid;
    place-items: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary-text);
    font-size: 0.72rem;
    font-weight: 800;
}

.check-list-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 24px;
}

.dot-list li {
    position: relative;
    padding: 4px 0 4px 20px;
    color: var(--text-primary);
}

.dot-list li::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 14px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
}

.badge-soft {
    flex-shrink: 0;
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary-text);
}

/* ---------- Small extras (Data Structures Lab links) ---------- */
.menu-new {
    margin-left: 6px;
    padding: 1px 7px;
    border-radius: 999px;
    background: var(--primary);
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-dark);
}

.lab-callout {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
    padding: 18px 22px;
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    background: var(--primary-light);
}

.lab-callout strong {
    display: block;
    color: var(--text-dark);
}

.lab-callout span {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.lab-callout div {
    flex: 1;
}

.lab-callout-badge {
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--primary);
    font-size: 0.75rem !important;
    font-weight: 800;
    color: var(--text-dark) !important;
}

.lab-callout-arrow {
    font-size: 1.4rem !important;
    color: var(--text-dark) !important;
    transition: transform 0.2s;
}

.lab-callout:hover .lab-callout-arrow {
    transform: translateX(4px);
}

/* ---------- Coming soon (track pages that are not open yet) ---------- */
.coming-soon-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.coming-soon-card {
    padding: 28px;
    gap: 14px;
}

.coming-soon-card:hover {
    transform: none;
}

.coming-soon-card h2 {
    font-size: 1.25rem;
}

.coming-soon-card .btn {
    align-self: flex-start;
}

@media (max-width: 760px) {
    .coming-soon-layout {
        grid-template-columns: 1fr;
    }
}

/* ---------- Flash message (one-time notice after an action) ---------- */
.flash-message {
    padding: 12px 0;
    border-bottom: 1px solid #BBF7D0;
    background: var(--green-bg, #F0FDF4);
    font-size: 0.93rem;
    font-weight: 600;
    color: var(--green-text, #166534);
}

/* ---------- Logged-in user in the navbar ---------- */
.nav-user {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    max-width: 180px;
    overflow: hidden;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: var(--text-dark);
}

.nav-avatar {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--primary);
    font-weight: 800;
    color: var(--text-dark);
}

.nav-logout {
    margin: 0;
}

/* ---------- Forms ---------- */
.form {
    display: grid;
    gap: 16px;
}

.form-field {
    display: grid;
    gap: 6px;
}

.form-field label {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-dark);
}

.form-field label small {
    font-weight: 500;
    color: var(--text-secondary);
}

.form-field input {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    font: inherit;
    color: var(--text-dark);
}

.form-field input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 178, 0, 0.25);
}

.form-field input.is-invalid {
    border-color: var(--danger);
}

.form-error {
    margin: 0;
    font-size: 0.83rem;
    font-weight: 600;
    color: var(--danger);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.btn-block {
    width: 100%;
}

/* ---------- Log in / Register pages ---------- */
.auth-section {
    padding: 64px 0;
    background: var(--background-soft);
}

.auth-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 440px);
    gap: 48px;
    align-items: center;
}

.auth-intro h1 {
    margin: 10px 0 12px;
    font-size: 2.3rem;
    line-height: 1.15;
}

.auth-intro p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.auth-steps {
    display: grid;
    gap: 10px;
    margin: 0;
    padding-left: 20px;
    color: var(--text-secondary);
}

.auth-steps strong {
    color: var(--text-dark);
}

.auth-card {
    padding: 32px;
}

.auth-card:hover {
    transform: none;
}

.auth-card h2 {
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.auth-switch {
    margin: 18px 0 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-switch a {
    font-weight: 700;
    color: var(--primary-text);
}

@media (max-width: 860px) {
    .auth-layout {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .auth-intro h1 {
        font-size: 1.8rem;
    }
}

/* =========================================================
   Assessments: quiz page, result page, certificate check
   ========================================================= */
.quiz-header {
    padding-bottom: 28px;
}

.quiz-rules {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0 0;
    padding: 0;
    list-style: none;
}

.quiz-rules li {
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.quiz-rules strong {
    color: var(--text-dark);
}

.quiz-section {
    padding-top: 32px;
}

.quiz-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 28px;
    align-items: start;
}

.quiz-form {
    display: grid;
    gap: 16px;
}

.quiz-question {
    min-width: 0;
    margin: 0;
    padding: 20px 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
}

.quiz-question legend {
    float: left;
    width: 100%;
    margin-bottom: 14px;
    padding: 0;
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--text-dark);
}

.quiz-num {
    display: block;
    margin-bottom: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--primary-text);
}

.quiz-options {
    clear: both;
    display: grid;
    gap: 8px;
}

.quiz-option {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.quiz-option:hover {
    border-color: var(--primary);
}

.quiz-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.quiz-option:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
}

.quiz-option:has(input:focus-visible) {
    outline: 3px solid rgba(255, 178, 0, 0.45);
}

.quiz-letter {
    display: inline-grid;
    place-items: center;
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border: 1.5px solid var(--border-strong);
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 700;
}

.quiz-option:has(input:checked) .quiz-letter {
    border-color: var(--text-dark);
    background: var(--text-dark);
    color: #fff;
}

.quiz-submit {
    display: grid;
    justify-items: start;
    gap: 10px;
}

.quiz-unanswered {
    margin: 0;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    background: #FEF3C7;
    font-size: 0.9rem;
    font-weight: 600;
    color: #92400E;
}

.quiz-aside {
    position: sticky;
    top: calc(var(--header-height) + 20px);
}

.quiz-status {
    display: grid;
    gap: 4px;
    padding: 20px;
}

.quiz-status:hover {
    transform: none;
}

.quiz-status p {
    margin: 0 0 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.quiz-status-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.quiz-timer,
.quiz-count {
    font-family: "JetBrains Mono", ui-monospace, monospace;
    font-size: 1.6rem;
    color: var(--text-dark);
}

.quiz-timer.is-low {
    color: var(--danger);
}

.quiz-back {
    margin-top: 12px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--primary-text);
}

/* Result */
.result-banner {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-top: 12px;
    padding: 24px 28px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
}

.result-banner.is-pass { border-color: var(--success); }
.result-banner.is-fail { border-color: var(--primary); }

.result-score {
    display: grid;
    place-content: center;
    flex-shrink: 0;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--background-soft);
    text-align: center;
}

.is-pass .result-score { background: #DCFCE7; }
.is-fail .result-score { background: var(--primary-light); }

.result-score strong {
    font-size: 2.3rem;
    line-height: 1.1;
    color: var(--text-dark);
}

.result-score span {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.result-text h1 {
    margin: 0 0 6px;
    font-size: 2rem;
}

.result-text p {
    margin: 0 0 14px;
    color: var(--text-secondary);
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.result-heading {
    margin: 0 0 12px;
    font-size: 1.3rem;
}

.result-note {
    margin: 0 0 16px;
    color: var(--text-secondary);
}

.review-list {
    display: grid;
    gap: 12px;
}

.review-card {
    padding: 16px 20px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
}

.review-card.is-right { border-left-color: var(--success); }
.review-card.is-wrong { border-left-color: var(--danger); }

.review-mark {
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.is-right .review-mark { color: var(--success); }
.is-wrong .review-mark { color: var(--danger); }

.review-question {
    margin: 6px 0 10px;
    font-weight: 700;
    color: var(--text-dark);
}

.review-options {
    display: grid;
    gap: 6px;
    margin: 0 0 10px;
    padding: 0;
    list-style: none;
}

.review-options li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.review-options li.is-correct {
    background: #DCFCE7;
    font-weight: 700;
    color: #166534;
}

.review-options li.is-chosen {
    background: #FEE2E2;
    color: #991B1B;
}

.review-explanation,
.review-yours {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-modules {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

.result-module {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
}

.result-module.is-full { border-color: var(--success); }
.result-module.is-zero { border-color: var(--danger); }

/* Certificate check */
.verify-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    gap: 40px;
    align-items: start;
}

.verify-title {
    margin: 10px 0 12px;
    font-size: 2.3rem;
}

.verify-form {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.verify-form input {
    flex: 1;
    min-width: 0;
    padding: 11px 14px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-family: "JetBrains Mono", ui-monospace, monospace;
    font-size: 1rem;
    text-transform: uppercase;
}

.verify-card {
    padding: 24px;
    border-width: 2px;
}

.verify-card:hover {
    transform: none;
}

.verify-card.is-valid   { border-color: var(--success); }
.verify-card.is-invalid { border-color: var(--danger); }

.verify-status {
    font-size: 1.1rem;
    font-weight: 800;
}

.is-valid .verify-status   { color: var(--success); }
.is-invalid .verify-status { color: var(--danger); }

.verify-card dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 8px 16px;
    margin: 16px 0 0;
}

.verify-card dt {
    color: var(--text-secondary);
}

.verify-card dd {
    margin: 0;
    font-weight: 700;
    overflow-wrap: anywhere;
}

.mono {
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

@media (max-width: 860px) {
    .quiz-layout,
    .verify-layout {
        grid-template-columns: 1fr;
    }

    .quiz-aside {
        position: static;
        order: -1;
    }

    .result-banner {
        flex-direction: column;
        text-align: center;
    }

    .result-actions {
        justify-content: center;
    }
}

/* Safe Exam Browser pages */
.seb-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 40px;
    align-items: start;
}

.seb-steps {
    display: grid;
    gap: 10px;
    margin: 20px 0 24px;
    padding-left: 22px;
    color: var(--text-secondary);
}

.seb-steps strong {
    color: var(--text-dark);
}

.seb-steps a {
    font-weight: 700;
    color: var(--primary-text);
}

.seb-note {
    margin: 12px 0 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.seb-card {
    padding: 24px;
}

.seb-card:hover {
    transform: none;
}

.seb-card h3 {
    margin: 0 0 12px;
}

.seb-done {
    text-align: center;
}

@media (max-width: 860px) {
    .seb-layout {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   Exam integrity mode (final exam) — see public/js/exam-integrity.js
   ========================================================= */

/* No way out of the page during the exam: menus, breadcrumbs and footer are hidden */
body.exam-mode .nav-menu,
body.exam-mode .menu-toggle,
body.exam-mode .breadcrumb,
body.exam-mode .site-footer,
body.exam-mode .quiz-back {
    display: none;
}

body.exam-mode .logo {
    pointer-events: none;
}

body.exam-mode .quiz-form {
    -webkit-user-select: none;
    user-select: none;
    transition: filter 0.15s;
}

/* Questions hidden before the start and while the student is away */
body.exam-locked .quiz-form,
body.exam-away .quiz-form {
    filter: blur(12px);
    pointer-events: none;
}

/* Fullscreen needs its own background */
body.exam-mode:fullscreen,
html:fullscreen {
    overflow-y: auto;
    background: var(--background);
}

.exam-count {
    color: var(--danger);
}

.exam-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 16px;
    background: rgba(17, 24, 39, 0.72);
    overflow-y: auto;
}

.exam-overlay[hidden] {
    display: none;
}

.exam-dialog {
    width: 100%;
    max-width: 560px;
    padding: 28px;
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-lg);
}

.exam-dialog h2 {
    margin: 6px 0 14px;
    font-size: 1.6rem;
}

.exam-dialog .check-list {
    margin-bottom: 18px;
}

.exam-dialog .quiz-unanswered {
    margin-bottom: 14px;
}

.exam-dialog-warn {
    border-top: 6px solid var(--danger);
    text-align: center;
}

.exam-warn-icon {
    display: inline-grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: #FEE2E2;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--danger);
}

.exam-dialog-warn p {
    margin: 0 0 10px;
    font-weight: 600;
}

.exam-warn-note {
    font-size: 0.9rem;
    font-weight: 400 !important;
    color: var(--text-secondary);
}

.exam-dialog-warn .btn {
    margin-top: 8px;
}

/* Watermark: name + email across the page (shows up on any screenshot) */
.exam-watermark {
    position: fixed;
    inset: -50%;
    z-index: 900;
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    gap: 90px 70px;
    transform: rotate(-24deg);
    pointer-events: none;
    overflow: hidden;
}

.exam-watermark span {
    font-size: 0.95rem;
    font-weight: 700;
    white-space: nowrap;
    color: rgba(17, 24, 39, 0.07);
}

.exam-toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    z-index: 1100;
    transform: translateX(-50%);
    padding: 10px 18px;
    border-radius: 999px;
    background: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
}

/* Printing the exam shows only a notice */
@media print {
    body.exam-mode * {
        visibility: hidden !important;
    }

    body.exam-mode::before {
        content: "Printing is turned off during the exam.";
        visibility: visible;
        font-size: 20px;
    }
}

/* Result page: how the attempt ended + the integrity log */
.result-ended {
    display: inline-block;
    margin: 0 0 8px !important;
    padding: 4px 12px;
    border-radius: 999px;
    background: #FEE2E2;
    font-size: 0.85rem;
    font-weight: 700;
    color: #991B1B !important;
}

.result-heading-gap {
    margin-top: 32px;
}

.integrity-log {
    display: grid;
    gap: 6px;
    max-width: 520px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: v;
}

.integrity-log li {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--danger);
    border-radius: var(--radius-sm);
    background: var(--surface);
    counter-increment: v;
}

.integrity-log li span::before {
    content: counter(v) ". ";
    font-weight: 700;
}

.integrity-log time {
    font-family: "JetBrains Mono", ui-monospace, monospace;
    color: var(--text-secondary);
}

/* Login: "keep me logged in" + "forgot password?" on one row */
.form-row-between {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px 16px;
}

.form-link {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-text);
}

/* ---------- Videos: popular / newest switch, pop-up player ---------- */
.video-tabs {
    display: inline-flex;
    gap: 4px;
    margin-bottom: 20px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
}

.video-tabs button {
    padding: 8px 18px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
    cursor: pointer;
}

.video-tabs button.is-active {
    background: var(--primary);
    color: var(--text-dark);
}

.video-tabs button:focus-visible {
    outline: 3px solid rgba(255, 178, 0, 0.45);
}

.video-grid[hidden] {
    display: none;
}

.video-empty {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 24px;
}

.video-empty p {
    margin: 0;
    color: var(--text-secondary);
}

.video-note {
    margin-top: 16px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

body.modal-open {
    overflow: hidden;
}

.video-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 16px;
    background: rgba(17, 24, 39, 0.82);
}

.video-modal[hidden] {
    display: none;
}

.video-modal-box {
    width: 100%;
    max-width: 960px;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: #0B0F19;
    box-shadow: var(--shadow-lg);
}

.video-modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 16px;
}

.video-modal-head h2 {
    margin: 0;
    overflow: hidden;
    font-size: 1rem;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #fff;
}

.video-modal-close {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    font-size: 1.4rem;
    line-height: 1;
    color: #fff;
    cursor: pointer;
}

.video-modal-close:hover {
    background: rgba(255, 255, 255, 0.24);
}

.video-modal-frame {
    aspect-ratio: 16 / 9;
    background: #000;
}

.video-modal-frame iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-modal-link {
    display: block;
    padding: 10px 16px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--primary);
}

/* ---------- Playlists (/videos, /videos/playlists/{id}) ---------- */
.playlist-card {
    overflow: hidden;
}

.playlist-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--dark-section);
    /* a second card peeking out behind: looks like a stack of videos */
    box-shadow: 0 -6px 0 -2px var(--dark-section-light);
}

.playlist-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.playlist-card:hover .playlist-thumb img {
    transform: scale(1.04);
}

.playlist-count {
    position: absolute;
    right: 10px;
    bottom: 10px;
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(17, 24, 39, 0.85);
    font-size: 0.78rem;
    font-weight: 700;
    color: #fff;
}

.playlist-play {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(17, 24, 39, 0.55);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #fff;
    opacity: 0;
    transition: opacity 0.2s;
}

.playlist-card:hover .playlist-play,
.playlist-card:focus-visible .playlist-play {
    opacity: 1;
}

.playlist-section {
    padding-top: 32px;
}

.playlist-player {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: #000;
    box-shadow: var(--shadow-lg);
}

.playlist-player iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
}

.playlist-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px 20px;
    margin: 16px 0 8px;
}

.playlist-actions p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.playlist-heading {
    margin: 40px 0 18px;
    font-size: 1.4rem;
}

.playlist-more a {
    font-weight: 700;
    color: var(--primary-text);
}

/* Pagination (partials/pagination) */
.pagination-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.pagination-nav a,
.pagination-nav .is-disabled {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    font-weight: 700;
    color: var(--text-dark);
}

.pagination-nav .is-disabled {
    opacity: 0.45;
}

.pagination-nav-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}


/* ---------- Articles (/articles) ---------- */
.article-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.article-filter a {
    padding: 7px 16px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.article-filter a:hover {
    color: var(--text-dark);
}

.article-filter a.is-active {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--text-dark);
}

.article-header h1 {
    margin: 4px 0 12px;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    line-height: 1.2;
}

.article-header .tag {
    display: inline-block;
}

.article-header .article-meta {
    margin-top: 20px;
    padding-top: 0;
    border-top: 0;
}

.article-section {
    padding-top: 36px;
}

/* The article text (also used by the admin preview) */
.article-body {
    font-size: 1.07rem;
    line-height: 1.8;
    color: var(--text-primary);
    overflow-wrap: break-word;
}

.article-body > :first-child {
    margin-top: 0;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote,
.article-body pre,
.article-body table {
    margin: 0 0 1.2em;
}

.article-body h1,
.article-body h2 {
    margin: 1.8em 0 0.6em;
    font-size: 1.5rem;
    line-height: 1.3;
}

.article-body h3,
.article-body h4 {
    margin: 1.5em 0 0.5em;
    font-size: 1.2rem;
}

.article-body ul,
.article-body ol {
    padding-left: 1.4em;
}

.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }

.article-body li {
    margin-bottom: 0.35em;
}

.article-body li::marker {
    color: var(--primary-hover);
}

.article-body a {
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--primary);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

.article-body blockquote {
    padding: 14px 18px;
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: var(--primary-light);
}

.article-body blockquote > :last-child {
    margin-bottom: 0;
}

.article-body code {
    padding: 2px 6px;
    border-radius: 6px;
    background: var(--background-alt);
    font-family: "JetBrains Mono", Consolas, monospace;
    font-size: 0.9em;
}

.article-body pre {
    padding: 18px 20px;
    overflow-x: auto;
    border-radius: var(--radius);
    background: var(--dark-section);
    line-height: 1.6;
}

.article-body pre code {
    padding: 0;
    background: none;
    font-size: 0.9rem;
    color: #E2E8F0;
}

.article-body hr {
    margin: 2em 0;
    border: 0;
    border-top: 1px solid var(--border);
}

.article-body img {
    max-width: 100%;
    border-radius: var(--radius);
}

.article-body table {
    display: block;
    width: 100%;
    overflow-x: auto;
    border-collapse: collapse;
}

.article-body th,
.article-body td {
    padding: 8px 12px;
    border: 1px solid var(--border);
}

.article-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 40px;
    padding: 22px 24px;
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    background: var(--primary-light);
}

.article-cta p {
    margin: 4px 0 0;
    color: var(--text-secondary);
}

/* ---------- Contact page ---------- */
.contact-list {
    display: grid;
    gap: 14px;
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
}

.contact-list li {
    display: grid;
    gap: 2px;
    padding-left: 14px;
    border-left: 3px solid var(--primary);
}

.contact-list strong {
    color: var(--text-dark);
}

.contact-list span {
    color: var(--text-secondary);
}

.contact-list a {
    font-weight: 700;
    color: var(--primary-text);
}

/* Spam trap: kept off-screen (not display:none, which some bots skip) */
.contact-trap {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form select,
.form textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    font: inherit;
}

.form textarea {
    resize: vertical;
}

.form select.is-invalid,
.form textarea.is-invalid {
    border-color: var(--danger);
}

.contact-privacy {
    margin: 10px 0 0;
    font-size: 0.82rem;
    text-align: center;
    color: var(--text-secondary);
}

/* ---------- Social links (footer, About, Contact) ---------- */
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0 0;
    padding: 0;
    list-style: none;
}

.social-links a {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface);
    color: var(--text-dark);
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.social-links a:hover,
.social-links a:focus-visible {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--text-dark);
}

.social-links-light a {
    border-color: rgba(255, 255, 255, 0.18);
    background: transparent;
    color: var(--dark-text);
}

.social-links-cta a {
    border-color: rgba(17, 24, 39, 0.25);
    background: transparent;
}

.social-links-cta a:hover {
    background: var(--text-dark);
    color: #fff;
}

.contact-list .social-links {
    margin-top: 6px;
}

/* ---------- About page ---------- */
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.section-head-center {
    justify-content: center;
    text-align: center;
}

.about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: center;
}

.about-hero h1 {
    margin: 8px 0 14px;
    font-size: clamp(2rem, 4.4vw, 3rem);
    line-height: 1.15;
}

.about-channel {
    display: grid;
    justify-items: center;
    gap: 6px;
    padding: 28px 24px;
    text-align: center;
}

.about-channel:hover {
    transform: none;
}

.about-wordmark {
    width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.about-channel strong {
    font-size: 1.15rem;
    color: var(--text-dark);
}

.about-channel > span {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.about-stats .stat {
    justify-content: center;
    text-align: center;
}

.about-stats-note {
    margin: 10px 0 0;
    font-size: 0.8rem;
    text-align: center;
    color: var(--text-secondary);
}

.about-story {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 48px;
}

.about-story h2 {
    margin-top: 8px;
}

.about-story-text p {
    margin: 0 0 1.1em;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.about-step {
    padding: 24px;
}

.about-step:hover {
    transform: none;
}

.about-step-num {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    margin-bottom: 14px;
    border-radius: 12px;
    background: var(--primary);
    font-weight: 800;
    color: var(--text-dark);
}

.about-step h3 {
    margin: 0 0 6px;
}

.about-step p,
.about-offer p {
    margin: 0;
    color: var(--text-secondary);
}

.about-offer {
    display: grid;
    gap: 8px;
    padding: 24px;
    color: inherit;
}

.about-offer h3 {
    margin: 0;
}

.about-offer span {
    margin-top: 6px;
    font-weight: 700;
    color: var(--primary-text);
}

@media (max-width: 900px) {
    .about-hero-grid,
    .about-story {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ---------- Privacy Policy / Terms ---------- */
.legal-section {
    padding-top: 32px;
}

.legal-summary {
    margin-bottom: 24px;
    padding: 18px 22px;
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    background: var(--primary-light);
}

.legal-summary ul {
    margin: 8px 0 0;
    padding-left: 1.2em;
    list-style: disc;
}

.legal-summary li {
    margin-bottom: 4px;
}

.legal-toc {
    margin-bottom: 32px;
    padding: 18px 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--background-soft);
}

.legal-toc ol {
    columns: 2;
    column-gap: 32px;
    margin: 8px 0 0;
    padding-left: 1.3em;
    list-style: decimal;
}

.legal-toc li {
    margin-bottom: 4px;
    break-inside: avoid;
}

.legal-toc a {
    color: var(--primary-text);
    font-weight: 600;
}

.legal-body h2 {
    scroll-margin-top: calc(var(--header-height) + 16px);
    font-size: 1.35rem;
}

.legal-body h3 {
    font-size: 1.05rem;
}

.legal-footer-links {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

.legal-footer-links a {
    font-weight: 700;
    color: var(--primary-text);
}

@media (max-width: 600px) {
    .legal-toc ol {
        columns: 1;
    }
}

/* ---------- Error pages (resources/views/errors) ---------- */
.error-page {
    min-height: 100vh;
    background: var(--background-soft);
}

.error-main {
    display: grid;
    justify-items: center;
    align-content: center;
    gap: 28px;
    min-height: 100vh;
    padding: 32px 16px;
}

.error-card {
    width: 100%;
    max-width: 560px;
    padding: 36px 32px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.error-code {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    background: var(--primary-light);
    font-family: "JetBrains Mono", Consolas, monospace;
    font-weight: 700;
    color: var(--primary-text);
}

.error-card h1 {
    margin: 16px 0 10px;
    font-size: clamp(1.5rem, 4vw, 2rem);
    line-height: 1.25;
}

.error-card p {
    margin: 0 0 24px;
    color: var(--text-secondary);
}

.error-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

/* ---------- "Skip to content" link (visible only when focused with the keyboard) ---------- */
.skip-link {
    position: absolute;
    top: -60px;
    left: 16px;
    z-index: 2000;
    padding: 10px 16px;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    background: var(--text-dark);
    font-weight: 700;
    color: #fff;
}

.skip-link:focus {
    top: 0;
}

main:focus {
    outline: none;
}

/* Footer: the red logo on a light plate (it would be hard to see on the dark footer) */
.footer-logo {
    display: inline-block;
    padding: 10px 14px;
    border-radius: var(--radius);
    background: #FFFFFF;
}

.footer-logo img {
    display: block;
    width: auto;
    height: 48px;
}

.error-logo img {
    display: block;
    width: auto;
    height: 56px;
}

/* "Learn by doing" box with a button per open track (partials/tracks-cta) */
.tracks-cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tracks-cta-buttons .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.tracks-cta-icon {
    display: inline-grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 7px;
    font-size: 0.68rem;
    font-weight: 800;
}