:root {
  --bg: #0b0b0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --line: rgba(244, 241, 234, 0.1);
  --text: #f4f1ea;
  --muted: #b7b1c4;
  --accent: #7c3aed;
  --accent-hover: #8b5cf6;
  --accent-deep: #5b21b6;
  --accent-soft: rgba(124, 58, 237, 0.16);
  --block: #f0a8a8;
  --contest: #e8c37a;
  --signal: #c4b5fd;
  --max: 68rem;
  --header-h: 4.25rem;
  --serif: "Fraunces", "Times New Roman", serif;
  --sans: "Source Sans 3", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --radius: 0.85rem;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

html:focus-within {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 12% -8%, rgba(124, 58, 237, 0.2), transparent 52%),
    radial-gradient(ellipse 45% 36% at 92% 4%, rgba(124, 58, 237, 0.08), transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: auto, auto, 3.5rem 3.5rem, 3.5rem 3.5rem;
}

body > * {
  position: relative;
  z-index: 1;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
p,
blockquote,
ul,
ol {
  margin: 0;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 80;
  padding: 0.55rem 0.8rem;
  background: var(--accent);
  color: #fff;
  border-radius: 0.4rem;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  background: rgba(11, 11, 15, 0.72);
  backdrop-filter: blur(16px);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  min-width: 0;
}

.wordmark-mark {
  width: 0.7rem;
  height: 1.35rem;
  border-radius: 1px;
  background: linear-gradient(180deg, var(--accent-hover), var(--accent-deep));
  box-shadow: 0 0 0 1px rgba(124, 58, 237, 0.35);
  flex: none;
}

.wordmark-text {
  font-family: var(--serif);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  color: var(--text);
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 0.55rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.05rem;
  height: 1.5px;
  background: currentColor;
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before {
  top: -5px;
}

.nav-toggle-bars::after {
  top: 5px;
}

.site-nav {
  display: none;
}

.site-nav.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  inset: var(--header-h) 0 auto;
  padding: 1rem 1rem 1.25rem;
  background: rgba(11, 11, 15, 0.96);
  border-bottom: 1px solid var(--line);
  gap: 0.35rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  padding: 0.7rem 0.35rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.28);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: rgba(196, 181, 253, 0.55);
  background: var(--accent-soft);
}

.btn-lg {
  min-height: 3.15rem;
  padding: 0.7rem 1.2rem;
}

.btn-compact {
  min-height: 2.4rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.92rem;
}

.btn-note {
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.82;
}

.hero {
  padding: 2.4rem 0 4rem;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
}

.kicker,
.section-kicker,
.mono-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
}

.kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.kicker-dot {
  width: 0.28rem;
  height: 0.28rem;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2.35rem, 8vw, 4.4rem);
  max-width: 14ch;
}

.subtitle {
  margin-top: 0.85rem;
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  color: var(--muted);
  max-width: 28ch;
}

.claim {
  margin-top: 1.6rem;
  padding: 1rem 0 1rem 1rem;
  border-left: 3px solid var(--accent);
}

.claim p {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2.5vw, 1.45rem);
  line-height: 1.4;
  max-width: 34ch;
}

.byline {
  margin-top: 1.4rem;
  font-weight: 600;
}

.byline-meta {
  display: block;
  margin-top: 0.2rem;
  font-weight: 400;
  color: var(--muted);
  font-size: 0.98rem;
}

.byline-contact {
  display: inline-block;
  margin-top: 0.45rem;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(183, 177, 196, 0.35);
}

.byline-contact:hover,
.byline-contact:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.book-stage {
  display: flex;
  justify-content: center;
  padding: 1rem 0 0.5rem;
}

.book {
  position: relative;
  width: min(100%, 17.5rem);
  transform: rotate3d(0.2, 0.9, 0, 16deg);
  transform-style: preserve-3d;
}

.book-spine {
  position: absolute;
  inset: 0.4rem auto 0.4rem -0.7rem;
  width: 0.75rem;
  background: linear-gradient(180deg, #2a1848, #150b24);
  border-radius: 3px 0 0 3px;
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.08);
}

.book-cover {
  min-height: 25.5rem;
  padding: 1.5rem 1.35rem 1.25rem;
  border-radius: 0 0.45rem 0.45rem 0;
  background:
    linear-gradient(180deg, rgba(124, 58, 237, 0.08), transparent 28%),
    linear-gradient(180deg, #17141f, #0e0c13);
  border: 1px solid rgba(244, 241, 234, 0.1);
  box-shadow: var(--shadow), 10px 18px 0 rgba(0, 0, 0, 0.28);
  display: flex;
  flex-direction: column;
}

.book-edition,
.book-author,
.book-sub,
.book-thesis {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

.book-title {
  margin-top: 1.4rem;
  font-family: var(--serif);
  font-size: 2.05rem;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.book-sub {
  margin-top: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.book-rule {
  width: 2.4rem;
  height: 2px;
  margin: 1.5rem 0 auto;
  background: var(--accent);
}

.book-thesis {
  color: var(--text);
  margin-bottom: 1.4rem;
}

.section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  font-size: clamp(1.85rem, 4vw, 2.7rem);
  max-width: 20ch;
  margin-top: 0.55rem;
}

.lede {
  margin-top: 1rem;
  color: var(--muted);
  max-width: 62ch;
  font-size: 1.125rem;
}

.card-grid,
.pillar-grid,
.paper-list {
  list-style: none;
  padding: 0;
  margin-top: 2rem;
  display: grid;
  gap: 1rem;
}

.card,
.pillar,
.paper,
.check-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.card,
.pillar,
.paper {
  padding: 1.35rem 1.3rem 1.4rem;
}

.card h3,
.pillar h3,
.paper h3 {
  font-size: 1.28rem;
  margin: 0.45rem 0 0.55rem;
}

.card p,
.pillar p,
.paper p,
.checklist p,
.gate-list p {
  color: var(--muted);
}

.gates {
  margin-top: 2.4rem;
  padding: 1.5rem 1.25rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.gates-title {
  font-size: 1.45rem;
}

.gates-rule {
  margin-top: 0.45rem;
  color: var(--text);
  font-weight: 600;
}

.gate-list {
  list-style: none;
  padding: 0;
  margin-top: 1.25rem;
  display: grid;
  gap: 1rem;
}

.gate-name {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.gate-block {
  color: var(--block);
}

.gate-contest {
  color: var(--contest);
}

.gate-signal {
  color: var(--signal);
}

.checklist-grid {
  display: grid;
  gap: 1.75rem;
}

.check-card {
  list-style: none;
  padding: 0.4rem 0;
}

.check-card li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.75rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
}

.check-card li:last-child {
  border-bottom: 0;
}

.check-num {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--accent-hover);
  padding-top: 0.2rem;
}

.check-card p {
  color: var(--text);
}

.paper .mono-label {
  color: var(--muted);
}

.text-link {
  display: inline-block;
  margin-top: 0.95rem;
  color: var(--signal);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(196, 181, 253, 0.35);
}

.text-link:hover,
.text-link:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

.cta-band {
  padding: 4.2rem 0;
  background:
    linear-gradient(180deg, rgba(124, 58, 237, 0.14), rgba(124, 58, 237, 0.05)),
    var(--bg-elevated);
  border-top: 1px solid rgba(124, 58, 237, 0.35);
  border-bottom: 1px solid var(--line);
}

.cta-inner h2 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  max-width: 18ch;
}

.cta-inner p {
  margin-top: 0.85rem;
  color: var(--muted);
  max-width: 46ch;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.site-footer {
  padding: 2.4rem 0 3rem;
}

.disclaimer,
.correspondence,
.copyright {
  color: var(--muted);
  font-size: 0.92rem;
}

.disclaimer {
  max-width: 68ch;
}

.correspondence,
.copyright {
  margin-top: 1rem;
}

.correspondence a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(183, 177, 196, 0.35);
}

.correspondence a:hover,
.correspondence a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

.page-not-found {
  padding: 6rem 0 4rem;
}

.page-not-found .btn {
  margin-top: 1.5rem;
}

:focus-visible {
  outline: 2px solid var(--accent-hover);
  outline-offset: 3px;
}

@media (min-width: 760px) {
  .nav-toggle {
    display: none;
  }

  .site-nav,
  .site-nav.is-open {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 1.15rem;
    padding: 0;
    background: none;
    border: 0;
  }

  .site-nav a {
    padding: 0;
    font-size: 0.95rem;
  }

  .hero-grid,
  .checklist-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 3rem;
  }

  .card-grid,
  .paper-list {
    grid-template-columns: 1fr 1fr;
  }

  .paper-list .paper-featured {
    grid-column: 1 / -1;
  }

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

  .gates {
    padding: 1.7rem 1.6rem 1.5rem;
  }

  .hero {
    padding-top: 3.4rem;
    padding-bottom: 5.2rem;
  }

  .section {
    padding: 5.2rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html,
  html:focus-within {
    scroll-behavior: auto;
  }

  .btn,
  .book {
    transition: none;
    transform: none;
  }

  .btn:hover {
    transform: none;
  }
}