@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap");

:root {
  --bg: #08131c;
  --bg-soft: #102433;
  --surface: rgba(10, 23, 34, 0.78);
  --surface-strong: rgba(13, 31, 45, 0.96);
  --surface-soft: rgba(218, 229, 238, 0.08);
  --text: #edf6fb;
  --muted: #9eb4c3;
  --line: rgba(163, 194, 214, 0.18);
  --accent: #51d0b1;
  --accent-strong: #1db893;
  --accent-soft: rgba(81, 208, 177, 0.14);
  --warm: #f3b562;
  --violet: #98a9ff;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.34);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max: 1180px;
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(24, 75, 104, 0.65), transparent 26%),
    radial-gradient(circle at 80% 12%, rgba(152, 169, 255, 0.22), transparent 22%),
    radial-gradient(circle at 50% 100%, rgba(81, 208, 177, 0.12), transparent 24%),
    linear-gradient(180deg, #08131c 0%, #091722 40%, #0c1d2a 100%);
  font-family: var(--font-body);
  line-height: 1.65;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.shell {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(6, 15, 24, 0.68);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 0;
}

.brand {
  text-decoration: none;
}

.brand-mark {
  display: block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--accent);
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.55rem 0.85rem;
}

.site-nav {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  transition: 180ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
  background: rgba(81, 208, 177, 0.12);
}

.hero {
  padding: 4.5rem 0 2.5rem;
}

.hero-panel,
.panel {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  border-radius: var(--radius-xl);
}

.hero-panel {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.6rem;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: auto -6rem -7rem auto;
  width: 18rem;
  height: 18rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(81, 208, 177, 0.32), transparent 68%);
  pointer-events: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.78rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

h1,
.h1-like {
  margin: 0.9rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.9rem, 7vw, 5.8rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
}

h2 {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}

.lead {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 62ch;
}

.hero-lead {
  font-size: 1.16rem;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.button,
.button-alt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.95rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.button:hover,
.button-alt:hover {
  transform: translateY(-1px);
}

.button {
  background: linear-gradient(135deg, var(--accent-strong), #4be0bc);
  color: #041018;
}

.button-alt {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  color: var(--text);
}

.stat-stack,
.metrics {
  display: grid;
  gap: 1rem;
}

.stat,
.metric,
.card,
.guide-card,
.note,
.path-card,
.info-card,
.quote-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.stat,
.metric {
  padding: 1rem 1.1rem;
}

.stat strong,
.metric strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

main section {
  padding: 1.4rem 0 2.2rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.grid-3,
.grid-2,
.guide-grid,
.link-grid,
.hero-orbit,
.story-grid,
.ecosystem-grid {
  display: grid;
  gap: 1rem;
}

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

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

.card,
.guide-card,
.note,
.panel,
.path-card,
.info-card,
.quote-card {
  padding: 1.35rem;
}

.card p,
.guide-card p,
.note p,
.panel p,
.metric p,
.stat p,
.path-card p,
.info-card p,
.quote-card p {
  margin: 0;
  color: var(--muted);
}

.card .kicker,
.mono,
.path-index {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--warm);
}

.section-list,
.checks {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.section-list li,
.checks li {
  margin: 0.45rem 0;
}

.callout {
  background: linear-gradient(135deg, rgba(81, 208, 177, 0.13), rgba(255, 255, 255, 0.03));
}

.page-hero {
  padding: 3.5rem 0 1rem;
}

.breadcrumbs {
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

.feature-banner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1rem;
  align-items: stretch;
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.hero-orbit {
  margin-top: 1.6rem;
}

.orbit-chip {
  padding: 0.85rem 0.95rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.orbit-chip strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 0.2rem;
}

.hero-side {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.signal-card {
  min-height: 100%;
  padding: 1.35rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(81, 208, 177, 0.2);
  background:
    linear-gradient(135deg, rgba(81, 208, 177, 0.13), rgba(152, 169, 255, 0.08)),
    rgba(255, 255, 255, 0.04);
}

.signal-card h3,
.quote-card h3 {
  margin-bottom: 0.75rem;
}

.signal-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.signal-item {
  padding: 0.85rem 0.95rem;
  border-radius: 14px;
  background: rgba(4, 16, 24, 0.34);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.signal-item strong {
  display: block;
  margin-bottom: 0.2rem;
}

.path-card {
  position: relative;
  overflow: hidden;
}

.portal-home {
  padding-top: 2.6rem;
}

.portal-entry-grid {
  align-items: stretch;
}

.portal-entry-card {
  display: grid;
  gap: 0.95rem;
  min-height: 100%;
  color: inherit;
  text-decoration: none;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.portal-entry-card:hover,
.portal-entry-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(81, 208, 177, 0.42);
  background:
    linear-gradient(135deg, rgba(81, 208, 177, 0.12), rgba(152, 169, 255, 0.06)),
    rgba(255, 255, 255, 0.05);
  box-shadow: 0 18px 40px rgba(4, 16, 24, 0.2);
}

.portal-entry-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.portal-entry-card .section-list {
  margin-top: 0;
}

.portal-entry-link {
  font-weight: 600;
  color: var(--accent);
}

.path-card::after {
  content: "";
  position: absolute;
  inset: auto 1.35rem 1.1rem auto;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(81, 208, 177, 0.25), transparent 70%);
}

.path-index {
  display: inline-block;
  margin-bottom: 0.7rem;
}

.story-grid .panel {
  min-height: 100%;
}

.home-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  margin: 0.6rem 0 0;
}

.ecosystem-grid .info-card {
  min-height: 100%;
}

.quote-card {
  background: linear-gradient(135deg, rgba(243, 181, 98, 0.09), rgba(255, 255, 255, 0.03));
}

.quote-card blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.2;
}

.site-footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 1.4rem;
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.code-block {
  border-radius: var(--radius-md);
  background: #07131c;
  color: #d5f4ea;
  padding: 1rem;
  overflow: auto;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.95rem;
}

.quiz-hero-panel {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1rem;
  overflow: hidden;
  position: relative;
}

.quiz-hero-panel::after {
  content: "";
  position: absolute;
  inset: auto auto -6rem -4rem;
  width: 17rem;
  height: 17rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(243, 181, 98, 0.18), transparent 70%);
  pointer-events: none;
}

.quiz-hero-copy,
.quiz-hero-side {
  position: relative;
  z-index: 1;
}

.quiz-hero-side {
  display: grid;
  gap: 1rem;
}

.quiz-inline-stats {
  display: grid;
  gap: 0.85rem;
}

.quiz-collection-grid,
.quiz-browser-grid {
  display: grid;
  gap: 1rem;
}

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

.quiz-collection-card {
  background:
    linear-gradient(135deg, rgba(81, 208, 177, 0.12), rgba(152, 169, 255, 0.06)),
    rgba(255, 255, 255, 0.04);
}

.quiz-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.quiz-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  border: 1px solid rgba(81, 208, 177, 0.18);
  background: rgba(81, 208, 177, 0.08);
  color: var(--text);
  font-size: 0.82rem;
}

.quiz-meta-row,
.quiz-browser-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.quiz-meta-row {
  margin-top: 0.95rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.quiz-preview-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.quiz-preview-item {
  padding: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.quiz-preview-item strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 0.35rem;
}

.quiz-preview-item p {
  margin: 0;
  color: var(--muted);
}

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

.quiz-browser-item {
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.quiz-browser-item h3 {
  margin-top: 0.65rem;
}

.quiz-browser-item p {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.quiz-difficulty {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.68rem;
  border-radius: 999px;
  background: rgba(152, 169, 255, 0.1);
  color: var(--violet);
  font-size: 0.8rem;
  text-transform: capitalize;
}

.quiz-app-shell {
  display: grid;
  gap: 1rem;
  grid-template-columns: 0.7fr 1.3fr;
  align-items: start;
}

.quiz-session-panel,
.quiz-stage-panel {
  min-height: 100%;
}

.quiz-session-meta {
  display: grid;
  gap: 0.85rem;
  margin-top: 0.95rem;
}

.quiz-progress {
  margin-top: 1rem;
}

.quiz-progress-bar {
  width: 100%;
  height: 0.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.quiz-progress-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-strong), #4be0bc);
  transition: width 220ms ease;
}

.quiz-status-line {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.quiz-loading-state,
.quiz-question-wrap,
.quiz-results-wrap {
  display: grid;
  gap: 1rem;
}

.quiz-code-panel {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(81, 208, 177, 0.18);
  background: rgba(4, 16, 24, 0.34);
  padding: 1rem;
}

.quiz-choice-list {
  display: grid;
  gap: 0.8rem;
}

.quiz-choice-button {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.quiz-choice-button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(81, 208, 177, 0.42);
  background: rgba(81, 208, 177, 0.08);
}

.quiz-choice-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.quiz-choice-button:disabled {
  cursor: default;
}

.quiz-choice-button.is-correct {
  border-color: rgba(81, 208, 177, 0.6);
  background: rgba(81, 208, 177, 0.14);
}

.quiz-choice-button.is-incorrect {
  border-color: rgba(243, 181, 98, 0.5);
  background: rgba(243, 181, 98, 0.12);
}

.quiz-choice-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  font-family: var(--font-display);
  font-weight: 700;
}

.quiz-choice-text {
  color: var(--text);
}

.quiz-feedback-panel {
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(81, 208, 177, 0.18);
  background: rgba(81, 208, 177, 0.08);
}

.quiz-feedback-panel.is-incorrect {
  border-color: rgba(243, 181, 98, 0.28);
  background: rgba(243, 181, 98, 0.08);
}

.quiz-feedback-panel h3,
.quiz-feedback-panel p {
  margin: 0;
}

.quiz-feedback-panel p {
  color: var(--text);
  margin-top: 0.55rem;
}

.quiz-details {
  margin-top: 0.85rem;
}

.quiz-details summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
}

.quiz-details[open] p,
.quiz-details[open] ul {
  margin-top: 0.7rem;
}

.quiz-details a {
  color: var(--text);
}

.quiz-error-card {
  background: linear-gradient(135deg, rgba(243, 181, 98, 0.09), rgba(255, 255, 255, 0.03));
}

@media (max-width: 900px) {
  .hero-panel,
  .feature-banner,
  .grid-3,
  .grid-2,
  .guide-grid,
  .link-grid,
  .hero-orbit,
  .story-grid,
  .ecosystem-grid,
  .quiz-hero-panel,
  .quiz-collection-grid,
  .quiz-browser-grid,
  .quiz-app-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-top: 0.75rem;
  }

  .site-nav.open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .site-nav a {
    border-radius: var(--radius-sm);
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-panel,
  .panel,
  .card,
  .guide-card,
  .path-card,
  .info-card,
  .quote-card {
    padding: 1.1rem;
  }

  h1,
  .h1-like {
    font-size: clamp(2.5rem, 13vw, 4rem);
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .quiz-choice-button {
    grid-template-columns: 1fr;
  }
}