:root {
  --color-brand: #1A1A2E;
  --color-accent: #4F46E5;
  --color-accent-light: #EEF2FF;
  --color-gray-100: #F8F9FA;
  --color-gray-700: #495057;
  --color-white: #FFFFFF;
  --color-border: #E6E8EF;
  --color-ink: #222336;
  --color-muted: #6B7280;
  --color-green: #16A34A;
  --color-blue: #2563EB;
  --color-amber: #D97706;
  --shadow: 0 20px 60px rgba(26, 26, 46, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #F3F4F7;
  color: var(--color-ink);
  font-family: Inter, Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

.shell {
  width: min(1040px, calc(100% - 32px));
  margin: 24px auto 56px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-white);
  box-shadow: 0 12px 36px rgba(26, 26, 46, 0.06);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  color: var(--color-brand);
}

.brand::before {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--color-accent);
  content: "";
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.nav a,
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 11px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 650;
  background: var(--color-white);
}

.nav a.active,
.pill.strong {
  color: var(--color-accent);
  border-color: #C7D2FE;
  background: var(--color-accent-light);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.72fr);
  gap: 24px;
  padding: 34px 36px 26px;
  background: var(--color-white);
}

.hero h1 {
  margin: 14px 0 14px;
  color: var(--color-brand);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: 0;
}

.hero p {
  max-width: 690px;
  margin: 0;
  color: var(--color-gray-700);
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 9px 15px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-brand);
  font-size: 13px;
  font-weight: 750;
  background: var(--color-white);
}

.button.primary {
  color: var(--color-white);
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.dashboard {
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #FBFCFF;
  box-shadow: none;
}

.mini-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 750;
}

.live-dot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-green);
}

.live-dot::before {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--color-green);
  content: "";
}

.stat-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.stat,
.card,
.panel,
.timeline-card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.stat {
  padding: 13px;
}

.stat .label {
  color: var(--color-muted);
  font-size: 11px;
  font-weight: 700;
}

.stat .value {
  margin-top: 4px;
  color: var(--color-brand);
  font-size: 22px;
  font-weight: 800;
}

.reader-list {
  margin-top: 12px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.reader-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 11px 12px;
  border-bottom: 1px solid var(--color-border);
}

.reader-row:last-child {
  border-bottom: 0;
}

.reader-name {
  font-size: 13px;
  font-weight: 760;
}

.reader-meta {
  color: var(--color-muted);
  font-size: 11px;
}

.progress {
  width: 82px;
  height: 6px;
  overflow: hidden;
  border-radius: 99px;
  background: #EEF0F5;
}

.progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--color-accent);
}

.section {
  padding: 28px 36px;
  border-top: 1px solid var(--color-border);
}

.section.alt {
  background: var(--color-gray-100);
}

.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.section-title h2 {
  margin: 0;
  color: var(--color-brand);
  font-size: 23px;
  line-height: 1.2;
}

.section-title p {
  max-width: 620px;
  margin: 6px 0 0;
  color: var(--color-muted);
  font-size: 14px;
}

.card {
  padding: 18px;
}

.card h3,
.panel h3,
.timeline-card h3 {
  margin: 0 0 8px;
  color: var(--color-brand);
  font-size: 16px;
}

.card p,
.panel p,
.timeline-card p {
  margin: 0;
  color: var(--color-gray-700);
  font-size: 13px;
}

.card.featured {
  border-color: var(--color-border);
  background: var(--color-white);
}

.tag {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  color: var(--color-accent);
  font-size: 11px;
  font-weight: 800;
  background: var(--color-accent-light);
}

.module-map,
.flow,
.stack-flow,
.roadmap {
  display: grid;
  gap: 12px;
}

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

.module {
  min-height: 84px;
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.module strong {
  display: block;
  margin-bottom: 5px;
  color: var(--color-brand);
  font-size: 13px;
}

.module span {
  display: block;
  color: var(--color-muted);
  font-size: 11px;
}

.flow {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.flow-step {
  position: relative;
  min-height: 92px;
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.flow-step::before {
  display: block;
  margin-bottom: 8px;
  color: var(--color-accent);
  font-size: 11px;
  font-weight: 850;
  content: attr(data-step);
}

.swatches {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}

.swatch {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.swatch .color {
  height: 58px;
}

.swatch code {
  display: block;
  padding: 10px;
  color: var(--color-gray-700);
  font-size: 11px;
  white-space: normal;
}

.stack-flow {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-items: stretch;
}

.stack-node {
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-white);
}

.stack-node strong {
  display: block;
  color: var(--color-brand);
}

.stack-node span {
  display: block;
  margin-top: 5px;
  color: var(--color-muted);
  font-size: 12px;
}

.roadmap {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.lane {
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: #FBFCFF;
}

.lane h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--color-brand);
  font-size: 14px;
}

.lane h3::before {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--lane-color, var(--color-accent));
  content: "";
}

.timeline-card {
  padding: 14px;
  margin-bottom: 10px;
}

.timeline-card:last-child {
  margin-bottom: 0;
}

.compact-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.compact-list li {
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  color: var(--color-gray-700);
  font-size: 13px;
  background: var(--color-white);
}

.code-card {
  overflow: auto;
  padding: 16px;
  border: 1px solid #D8DDF0;
  border-radius: 12px;
  color: #E7E9FF;
  background: var(--color-brand);
}

.code-card code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  white-space: pre;
}

.footer {
  padding: 22px 36px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 12px;
  background: var(--color-white);
}

@media (max-width: 900px) {
  .hero,
  .stat-grid,
  .card-grid,
  .module-map,
  .flow,
  .stack-flow,
  .roadmap,
  .swatches,
  .compact-list {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    padding: 32px 24px 24px;
  }

  .section {
    padding: 28px 24px;
  }
}

@media (max-width: 620px) {
  .shell {
    width: 100%;
    margin: 0;
    border-width: 0;
    border-radius: 0;
  }

  .topbar,
  .section-title,
  .reader-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .stat-grid,
  .card-grid,
  .module-map,
  .flow,
  .stack-flow,
  .roadmap,
  .swatches,
  .compact-list {
    grid-template-columns: 1fr;
  }

  .topbar {
    position: static;
  }
}