:root {
  --bg: #07111f;
  --bg-soft: #0d1b2a;
  --panel: rgba(15, 28, 42, 0.9);
  --panel-alt: rgba(18, 34, 52, 0.8);
  --card: #12263b;
  --line: rgba(160, 191, 255, 0.18);
  --text: #eaf4ff;
  --muted: #a9bfd8;
  --primary: #65d6ff;
  --secondary: #8ef1d2;
  --highlight: #f9c74f;
  --shadow: rgba(11, 19, 32, 0.4);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background:
    radial-gradient(circle at top, rgba(101, 214, 255, 0.2), transparent 30%),
    linear-gradient(180deg, var(--bg), #091a2b 55%, #070f1a);
  color: var(--text);
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(7, 17, 31, 0.7);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #072031;
  font-weight: 800;
}

nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.96rem;
  transition: color 0.2s ease;
}

nav a:hover,
nav a.active {
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.4rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #7bb7ff);
  color: #061827;
  text-decoration: none;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(101, 214, 255, 0.28);
}

.button.small {
  padding: 0.7rem 1.1rem;
  font-size: 0.9rem;
}

.button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: none;
}

.hero {
  padding: 90px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--secondary);
}

h1, h2, h3, p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.7rem, 5vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.06em;
  margin-bottom: 18px;
}

.lead {
  max-width: 620px;
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--muted);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 24px;
}

.hero-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  padding: 0;
  margin: 0;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 110px;
}

.hero-stats strong {
  font-size: 1.8rem;
  color: var(--text);
}

.hero-stats span {
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-panel {
  background: linear-gradient(180deg, rgba(15, 28, 42, 0.92), rgba(8, 17, 29, 0.94));
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 30px 60px var(--shadow);
}

.mini-card {
  background: rgba(101, 214, 255, 0.08);
  border: 1px solid rgba(101, 214, 255, 0.2);
  border-radius: 18px;
  padding: 20px;
}

.badge {
  display: inline-block;
  background: rgba(142, 241, 210, 0.18);
  border: 1px solid rgba(142, 241, 210, 0.22);
  color: var(--secondary);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.mini-card h3 {
  margin: 18px 0 18px;
  font-size: 1.5rem;
}

.signal-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.signal-row span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.02);
}

.brain-box {
  position: relative;
  margin-top: 28px;
  min-height: 220px;
  border-radius: 20px;
  border: 1px dashed rgba(101, 214, 255, 0.36);
  background: rgba(255, 255, 255, 0.02);
}

.node {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 96px;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  font-weight: 600;
  color: #05151f;
}

.node-a { top: 18px; left: 24px; background: var(--primary); }
.node-b { top: 26px; right: 28px; background: var(--secondary); }
.node-c { bottom: 28px; left: 26px; background: #c7d6ff; }
.node-d { bottom: 42px; right: 32px; background: var(--highlight); }

.section {
  padding: 96px 0;
}

.alt {
  background: rgba(6, 17, 27, 0.55);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-header {
  margin-bottom: 30px;
}

.section-header h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  letter-spacing: -0.05em;
  margin-bottom: 0;
}

.roadmap-grid,
.project-grid,
.timeline,
.lesson-grid,
.page-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.card,
.project-card,
.info-box,
.resource-item,
.cta-box,
.code-panel,
.lesson-card,
.timeline-card,
.page-panel {
  background: linear-gradient(180deg, rgba(18, 38, 59, 0.9), rgba(12, 23, 35, 0.9));
  border: 1px solid var(--line);
  border-radius: 20px;
}

.card,
.project-card,
.lesson-card,
.timeline-card,
.page-panel {
  padding: 26px 22px;
}

.step {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: rgba(101, 214, 255, 0.15);
  border: 1px solid rgba(101, 214, 255, 0.18);
  color: var(--primary);
  font-weight: 700;
}

.card h3,
.project-card h3,
.info-box h3,
.lesson-card h3,
.timeline-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.card p,
.project-card p,
.resource-item span,
.info-box li,
.lesson-card p,
.timeline-card p,
.page-panel li {
  color: var(--muted);
  line-height: 1.7;
}

.skills-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 22px;
  align-items: start;
}

.code-panel {
  overflow: hidden;
}

.panel-label {
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--secondary);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

pre {
  margin: 0;
  padding: 22px 18px 26px;
  overflow-x: auto;
  color: #dff5ff;
  line-height: 1.7;
  font-size: 0.92rem;
}

.info-stack {
  display: grid;
  gap: 20px;
}

.info-box {
  padding: 24px 22px;
}

.info-box ul,
.page-panel ul {
  margin: 0;
  padding-left: 18px;
}

.tag {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--secondary);
}

.resource-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 22px;
  align-items: center;
}

.resource-list {
  display: grid;
  gap: 18px;
}

.resource-item {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 30px;
}

.page-hero {
  padding: 72px 0 40px;
}

.page-hero h1 {
  margin-bottom: 14px;
}

.page-intro {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.75;
}

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

.page-panel h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.checklist li {
  position: relative;
  padding-left: 24px;
  color: var(--muted);
  line-height: 1.7;
}

.checklist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--secondary);
  font-weight: 700;
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 20px;
}

.lesson-detail {
  display: none;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.lesson-card.expanded .lesson-detail,
.page-panel.expanded .lesson-detail {
  display: block;
}

.accordion-toggle {
  width: 100%;
  background: transparent;
  border: 0;
  color: inherit;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 0;
}

.accordion-title-wrap {
  flex: 1;
}

.accordion-toggle h3,
.accordion-toggle p {
  margin: 0;
}

.accordion-toggle p {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.6;
}

.lesson-detail h4 {
  margin: 18px 0 10px;
  color: var(--text);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.lesson-detail ul {
  margin: 0 0 16px;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.lesson-detail p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: rgba(7, 17, 31, 0.98);
  border-top: 1px solid var(--line);
  box-shadow: 0 -12px 32px rgba(0, 0, 0, 0.28);
}

.cookie-content {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.cookie-content p {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 740px;
  line-height: 1.6;
}

.cookie-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

.cookie-banner.hidden {
  display: none;
}

@media (max-width: 900px) {
  .hero-grid,
  .skills-layout,
  .resource-grid,
  .roadmap-grid,
  .project-grid,
  .timeline,
  .lesson-grid,
  .page-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-wrap: wrap;
    padding: 14px 0;
  }

  nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .cta-box {
    flex-direction: column;
    align-items: flex-start;
  }
}