/* ===========================
   DeepML.dev — Main Styles
   Aesthetic: Dark editorial, scientific brutalism with warmth
   =========================== */

:root {
  --bg: #0a0a0f;
  --bg2: #111118;
  --bg3: #1a1a24;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8e8f0;
  --text-muted: #7a7a94;
  --text-dim: #4a4a60;
  --accent: #00e5cc;
  --accent2: #7c3aed;
  --accent3: #f97316;
  --gold: #fbbf24;
  --white: #ffffff;
  --font-display: 'Inter', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --font-body: 'Inter', sans-serif;
  --radius: 12px;
  --glow: 0 0 40px rgba(0, 229, 204, 0.15);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* TYPOGRAPHY */
h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-display);
  line-height: 1.1;
  font-weight: 800;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.4rem;
}

h4 {
  font-size: 1.1rem;
}

em {
  font-style: normal;
  color: var(--accent);
}

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

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ======================== NAV ======================== */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background 0.3s, backdrop-filter 0.3s;
  padding: 18px 0;
}

#nav.scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--white);
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  margin-left: auto;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--white);
}

.btn-nav {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  background: var(--accent);
  color: #000;
  padding: 8px 20px;
  border-radius: 6px;
  transition: transform 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}

.btn-nav:hover {
  transform: translateY(-1px);
  box-shadow: var(--glow);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}

/* ======================== HERO ======================== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#neuralCanvas {
  width: 100%;
  height: 100%;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1180px;
  margin: 0 auto;
  padding: 120px 24px 60px;
  max-width: 780px;
  margin-left: max(24px, calc(50vw - 590px));
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: rgba(0, 229, 204, 0.12);
  border: 1px solid rgba(0, 229, 204, 0.3);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
  animation: fadeInUp 0.6s ease both;
}

h1 {
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 580px;
  margin-top: 20px;
  line-height: 1.7;
  font-weight: 300;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-top: 36px;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.btn-primary {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  background: var(--accent);
  color: #000;
  padding: 14px 28px;
  border-radius: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 229, 204, 0.3);
}

.btn-ghost {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  background: transparent;
  color: var(--text);
  padding: 14px 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: background 0.2s, border-color 0.2s;
  cursor: pointer;
}

.btn-ghost:hover {
  background: var(--bg3);
  border-color: rgba(255, 255, 255, 0.2);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.stat span {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.stat small {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
  display: block;
}

.scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  animation: bounce 2s infinite;
  z-index: 2;
}

/* ======================== TICKER ======================== */
.ticker-wrap {
  overflow: hidden;
  background: var(--bg3);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.ticker {
  display: flex;
  gap: 48px;
  white-space: nowrap;
  animation: ticker 30s linear infinite;
  width: max-content;
}

.ticker span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ======================== SECTIONS ======================== */
section {
  padding: 100px 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-top: 16px;
  line-height: 1.7;
}

/* ======================== WHY ======================== */
#why {
  background: var(--bg2);
}

#why h2 {
  margin-bottom: 56px;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.why-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.3s, transform 0.3s;
}

.why-card:hover {
  border-color: rgba(0, 229, 204, 0.3);
  transform: translateY(-4px);
}

.why-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.why-card h3 {
  margin-bottom: 12px;
}

.why-card p {
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ======================== LEARN / PATHS ======================== */
#learn {
  background: var(--bg);
}

.paths-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
  margin-top: 48px;
}

.path-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.path-card:hover {
  border-color: rgba(0, 229, 204, 0.2);
  box-shadow: 0 0 40px rgba(0, 229, 204, 0.05);
}

.path-featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #0d1f1e 0%, #0f1520 100%);
  border-color: rgba(0, 229, 204, 0.25);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto 1fr auto;
  gap: 0 48px;
}

.path-featured .path-num {
  grid-row: 1;
  grid-column: 1;
}

.path-featured .path-tag {
  grid-row: 1;
  grid-column: 2;
  align-self: start;
}

.path-featured h3 {
  grid-column: 1;
}

.path-featured p {
  grid-column: 1;
}

.path-featured .path-lessons {
  grid-column: 1;
}

.path-featured .btn-path {
  grid-column: 1;
  justify-self: start;
}

.path-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(0, 229, 204, 0.12);
  border: 1px solid rgba(0, 229, 204, 0.3);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
  white-space: nowrap;
}

.path-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.path-card h3 {
  margin-bottom: 12px;
}

.path-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.path-lessons {
  list-style: none;
  margin-bottom: 28px;
}

.path-lessons li {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg3);
  color: var(--text-dim);
  white-space: nowrap;
}

.pill.free {
  background: rgba(0, 229, 204, 0.1);
  color: var(--accent);
}

.btn-path {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid rgba(0, 229, 204, 0.3);
  padding-bottom: 2px;
  transition: gap 0.2s;
}

.btn-path:hover {
  gap: 10px;
}

/* ======================== TOPICS ======================== */
#topics {
  background: var(--bg2);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 48px;
}

.topic-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
}

.topic-card:hover {
  border-color: rgba(0, 229, 204, 0.25);
  transform: translateY(-3px);
}

.topic-emoji {
  font-size: 1.8rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.topic-card h4 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.topic-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 8px;
}

.topic-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  background: rgba(0, 229, 204, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ======================== PLAYGROUND ======================== */
#playground {
  background: var(--bg);
}

.playground-wrap {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 32px;
  margin-top: 48px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.playground-sidebar {
  padding: 36px;
  border-right: 1px solid var(--border);
}

.playground-sidebar h3 {
  margin-bottom: 12px;
}

.playground-sidebar p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.control-group {
  margin-bottom: 20px;
}

.control-group label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 8px;
}

.control-group label strong {
  color: var(--accent);
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.playground-sidebar .btn-primary,
.playground-sidebar .btn-ghost {
  width: 100%;
  text-align: center;
  display: block;
  font-size: 0.9rem;
  padding: 10px;
  margin-bottom: 10px;
}

.lesson-links {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.lesson-links p {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.lesson-links a {
  display: block;
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  transition: color 0.2s;
}

.lesson-links a:hover {
  color: var(--accent);
}

.playground-canvas-wrap {
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#gdCanvas {
  border-radius: 8px;
  background: var(--bg3);
  max-width: 100%;
  height: auto;
}

.playground-info {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.info-chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 6px;
  color: var(--text-muted);
}

/* ======================== GLOSSARY ======================== */
#glossary-preview {
  background: var(--bg2);
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.gls-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.gls-card:hover {
  border-color: rgba(0, 229, 204, 0.2);
}

.gls-card h4 {
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.gls-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.gls-card a {
  font-size: 0.82rem;
  color: var(--accent);
  transition: opacity 0.2s;
}

.gls-card a:hover {
  opacity: 0.7;
}

.glossary-cta {
  text-align: center;
  margin-top: 48px;
}

/* ======================== RESOURCES ======================== */
#resources {
  background: var(--bg);
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.res-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.res-type {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--white);
}

.res-card ul {
  list-style: none;
}

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

.res-card a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color 0.2s;
  line-height: 1.4;
  display: block;
}

.res-card a:hover {
  color: var(--accent);
}

/* ======================== NEWSLETTER ======================== */
#newsletter {
  background: linear-gradient(135deg, #0d1f1e 0%, #0a0a1a 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.newsletter-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.nl-social-proof {
  display: inline-block;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.nl-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.nl-form input {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.2s;
  outline: none;
}

.nl-form input:focus {
  border-color: var(--accent);
}

.nl-form input::placeholder {
  color: var(--text-dim);
}

.nl-form small {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.nl-success {
  display: none;
  text-align: center;
  padding: 20px;
  font-size: 1.1rem;
  color: var(--accent);
  font-family: var(--font-display);
}

/* ======================== FOOTER ======================== */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 80px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 12px;
  max-width: 260px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-links h5 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ======================== ANIMATIONS ======================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ticker {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-50%);
  }
}

@keyframes bounce {

  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  50% {
    transform: translateX(-50%) translateY(8px);
  }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ======================== RESPONSIVE ======================== */
@media (max-width: 900px) {
  .paths-grid {
    grid-template-columns: 1fr;
  }

  .path-featured {
    grid-template-columns: 1fr;
  }

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

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

  .playground-wrap {
    grid-template-columns: 1fr;
  }

  .playground-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 768px) {

  .nav-links,
  .btn-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

  h1 {
    font-size: 2.4rem;
  }

  h2 {
    font-size: 1.8rem;
  }

  section {
    padding: 70px 0;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn-primary,
  .hero-cta .btn-ghost {
    text-align: center;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

/* ======================== INNER PAGES ======================== */
.page-hero {
  padding: 140px 24px 60px;
  max-width: 1180px;
  margin: 0 auto;
}

.lesson-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
}

.lesson-card:hover {
  border-color: rgba(0, 229, 204, 0.3);
  transform: translateX(6px);
}

.lesson-card-info h4 {
  margin-bottom: 4px;
}

.lesson-card-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.lesson-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lesson-duration {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

a.lesson-card {
  text-decoration: none;
  color: inherit;
}

/* ======================== SKIP LINK ======================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0 0 8px 8px;
  transition: top 0.2s;
}

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

/* ======================== THEME TOGGLE ======================== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--text);
  transition: border-color 0.2s;
  margin-left: 8px;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

/* ======================== COMING SOON BADGE ======================== */
.coming-soon-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  background: rgba(249, 115, 22, 0.12);
  border: 1px solid rgba(249, 115, 22, 0.3);
  color: #f97316;
  padding: 3px 10px;
  border-radius: 100px;
  margin-top: 8px;
}

/* ======================== INNER PAGE UTILITY CLASSES ======================== */
.page-meta {
  display: flex;
  gap: 20px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.page-meta-item {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.page-meta-item.accent {
  color: var(--accent);
}

.content-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 28px;
}

.content-box h3 {
  margin-bottom: 8px;
}

.content-box p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.module-heading {
  margin: 40px 0 24px;
  color: var(--text-muted);
  font-size: 1rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.module-heading:first-of-type {
  margin-top: 0;
}

.center-cta {
  text-align: center;
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.center-cta p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.center-cta .cta-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.stub-page {
  padding-bottom: 80px;
  text-align: center;
}

.footer-simple {
  padding: 32px 0;
}

.footer-simple .footer-bottom {
  justify-content: center;
  border-top: none;
}

.lesson-card-featured {
  border-color: rgba(0, 229, 204, 0.25);
  background: linear-gradient(135deg, #0d1f1e, #0f1520);
}

.container-padded {
  padding-bottom: 80px;
}

/* ======================== MOBILE MENU (class-based) ======================== */
@media (max-width: 768px) {
  .nav-links.is-open {
    display: flex !important;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    backdrop-filter: blur(16px);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }

  .btn-nav.is-open {
    display: block !important;
    margin: 0 24px;
    text-align: center;
  }
}

/* ======================== 404 PAGE ======================== */
.page-404 {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.page-404 .error-code {
  font-family: var(--font-mono);
  font-size: clamp(5rem, 15vw, 12rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  opacity: 0.3;
}

.page-404 h1 {
  margin-bottom: 16px;
  animation: none;
}

.page-404 p {
  color: var(--text-muted);
  margin-bottom: 32px;
}