:root {
  --bg: #f3f6fb;
  --bg-secondary: #e8edf6;
  --panel: rgba(255, 255, 255, 0.58);
  --panel-strong: rgba(255, 255, 255, 0.72);
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --text-soft: rgba(15, 23, 42, 0.72);
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --glow-blue: rgba(55, 93, 170, 0.12);
  --glow-gold: rgba(199, 160, 87, 0.13);
  --glow-violet: rgba(103, 77, 152, 0.08);
  --midnight-sapphire: #0d1b3d;
  --midnight-blue: #112048;
  --black-void: #05070d;
  --gold: #c7a057;
  --violet: #4a376f;
  --gray: #94a3b8;
  --hero-title: #07111f;
  --chip-bg: rgba(255, 255, 255, 0.56);
  --book-bg: linear-gradient(180deg, rgba(13, 20, 39, 0.95), rgba(20, 29, 54, 0.94));
}

html:not(.dark) { color-scheme: light; }

html.dark {
  color-scheme: dark;
  --bg: #04060c;
  --bg-secondary: #080d18;
  --panel: rgba(7, 10, 18, 0.58);
  --panel-strong: rgba(10, 14, 24, 0.74);
  --border: rgba(255, 255, 255, 0.08);
  --text: #edf2f7;
  --text-soft: rgba(226, 232, 240, 0.72);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --glow-blue: rgba(49, 80, 150, 0.22);
  --glow-gold: rgba(201, 160, 79, 0.18);
  --glow-violet: rgba(88, 63, 146, 0.18);
  --hero-title: #ffffff;
  --chip-bg: rgba(255, 255, 255, 0.05);
  --book-bg: linear-gradient(180deg, rgba(8, 12, 24, 0.98), rgba(15, 22, 40, 0.95));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 16%, var(--glow-blue), transparent 24%),
    radial-gradient(circle at 82% 12%, var(--glow-violet), transparent 22%),
    radial-gradient(circle at 50% 78%, var(--glow-gold), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-secondary) 48%, var(--bg) 100%);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 220ms ease, color 220ms ease;
}

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

.site-shell {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.container {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.grid-fog, .starfield, .orbital-ring, .orbital-ring-2, .orbital-ring-3, .ambient-beacon {
  pointer-events: none;
  position: absolute;
  z-index: 0;
}

.grid-fog {
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at center, black 48%, transparent 88%);
  opacity: 0.55;
}

html.dark .grid-fog {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  opacity: 0.34;
}

.starfield {
  inset: 0;
  opacity: 0.7;
  background-image:
    radial-gradient(circle at 12% 20%, rgba(255,255,255,0.85) 0 1px, transparent 1.2px),
    radial-gradient(circle at 76% 18%, rgba(255,255,255,0.6) 0 1px, transparent 1.2px),
    radial-gradient(circle at 32% 66%, rgba(255,255,255,0.5) 0 1px, transparent 1.2px),
    radial-gradient(circle at 66% 54%, rgba(255,255,255,0.72) 0 1px, transparent 1.2px),
    radial-gradient(circle at 48% 32%, rgba(199,160,87,0.72) 0 1.2px, transparent 1.4px),
    radial-gradient(circle at 84% 72%, rgba(135,161,235,0.7) 0 1.2px, transparent 1.4px),
    radial-gradient(circle at 22% 84%, rgba(140,120,200,0.6) 0 1.2px, transparent 1.4px);
  filter: blur(0.15px);
}

.orbital-ring, .orbital-ring-2, .orbital-ring-3 {
  border-radius: 999px;
  border: 1px solid rgba(199, 160, 87, 0.14);
  mix-blend-mode: screen;
}

.orbital-ring {
  width: 54rem; height: 54rem; top: -16rem; right: -16rem;
  transform: rotate(12deg);
  box-shadow: 0 0 80px rgba(199, 160, 87, 0.06);
}
.orbital-ring-2 {
  width: 38rem; height: 38rem; left: -9rem; top: 18rem;
  transform: rotate(-18deg);
  border-color: rgba(105, 132, 212, 0.16);
}
.orbital-ring-3 {
  width: 22rem; height: 22rem; left: 48%; top: 8rem;
  border-color: rgba(129, 108, 189, 0.16);
}

.ambient-beacon {
  width: 10rem; height: 10rem; border-radius: 999px;
  background: radial-gradient(circle, rgba(199, 160, 87, 0.12), transparent 64%);
  filter: blur(10px);
}
.beacon-left { left: 8%; top: 8rem; }
.beacon-right { right: 10%; top: 34rem; }

.glass {
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.chip {
  display: inline-flex; align-items: center; gap: 0.75rem;
  padding: 0.7rem 1rem; border-radius: 999px;
  border: 1px solid var(--border); background: var(--chip-bg);
  text-transform: uppercase; letter-spacing: 0.32em; font-size: 0.68rem;
}

.hud-dot {
  width: 0.5rem; height: 0.5rem; border-radius: 999px;
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(199,160,87,0.95));
  box-shadow: 0 0 18px rgba(199,160,87,0.55); flex: 0 0 auto;
}

.header { padding: 1.5rem 0; }
.header-row {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: 0.9rem; }
.brand-mark {
  width: 2.8rem; height: 2.8rem; border-radius: 1rem; display: grid; place-items: center;
  font-size: 0.84rem; font-weight: 700; letter-spacing: 0.24em;
  border: 1px solid var(--border); background: var(--panel-strong);
}
.brand-overline {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.34em;
  color: var(--text-soft); margin-bottom: 0.2rem;
}
.brand-name { font-size: 0.95rem; letter-spacing: 0.12em; font-weight: 500; }

.nav { display: flex; gap: 0.75rem; flex-wrap: wrap; justify-content: flex-end; }
.nav a, .button-secondary, .button-primary, .book-card, .section-card, .nav-chip, .theme-toggle {
  transition: transform 220ms ease, border-color 220ms ease, background-color 220ms ease, box-shadow 220ms ease, opacity 220ms ease;
}
.nav a:hover, .button-secondary:hover, .button-primary:hover, .book-card:hover, .section-card:hover, .nav-chip:hover, .theme-toggle:hover {
  transform: translateY(-2px);
}
.nav-chip {
  padding: 0.75rem 1rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--chip-bg); text-transform: uppercase; letter-spacing: 0.22em;
  font-size: 0.72rem; color: var(--text);
}
.theme-toggle {
  cursor: pointer; border: 1px solid var(--border); background: var(--chip-bg); color: var(--text);
  border-radius: 999px; padding: 0.75rem 1rem; text-transform: uppercase; letter-spacing: 0.22em; font-size: 0.72rem;
}

.hero { padding: 2rem 0 4rem; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2rem; align-items: center;
}
.hero-copy { display: grid; gap: 1.5rem; }
.hero-title {
  margin: 0; font-size: clamp(3.1rem, 7vw, 5.6rem); line-height: 0.95; letter-spacing: -0.05em;
  color: var(--hero-title); max-width: 13ch;
}
.hero-text {
  margin: 0; max-width: 40rem; font-size: 1.08rem; line-height: 1.9; color: var(--text-soft);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; }

.button-primary, .button-secondary {
  display: inline-flex; align-items: center; justify-content: center; min-height: 3rem;
  border-radius: 999px; padding: 0.95rem 1.4rem; font-size: 0.82rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em;
}
.button-primary {
  background: var(--gold); color: #0a0d14; border: 1px solid rgba(199, 160, 87, 0.55);
  box-shadow: 0 10px 35px rgba(199, 160, 87, 0.25);
}
.button-primary:hover { background: #d8b16a; }
.button-secondary { background: var(--chip-bg); border: 1px solid var(--border); color: var(--text); }

.hero-points {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem;
}
.mini-panel { padding: 1.2rem; border-radius: 1.4rem; }
.mini-overline, .section-overline, .eyebrow {
  text-transform: uppercase; letter-spacing: 0.28em; font-size: 0.66rem; color: var(--text-soft);
}
.mini-copy {
  margin: 0.6rem 0 0; font-size: 0.92rem; line-height: 1.8; color: var(--text);
}

.hero-interface {
  position: relative; padding: 1.4rem; border-radius: 1.75rem; overflow: hidden;
}
.hero-interface::before {
  content: ""; position: absolute; inset: 0; border-radius: 1.75rem; padding: 1px;
  background: linear-gradient(135deg, rgba(199,160,87,0.5), rgba(67,95,172,0.22), rgba(120,98,178,0.24));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none;
}
.scan-lines {
  position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.012) 16%, transparent 26%, rgba(255,255,255,0.04) 52%, transparent 76%, rgba(255,255,255,0.03));
  mask-image: linear-gradient(to bottom, transparent, black 14%, black 86%, transparent);
  pointer-events: none;
}
.interface-head {
  position: relative; display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding-bottom: 1rem; border-bottom: 1px solid var(--border); margin-bottom: 1rem;
}
.interface-title { margin-top: 0.45rem; font-size: 1.3rem; letter-spacing: 0.04em; }
.signal-lights { display: flex; gap: 0.45rem; }
.signal-lights span {
  width: 0.72rem; height: 0.72rem; border-radius: 999px; display: block;
}
.signal-lights span:nth-child(1) { background: rgba(255,255,255,0.7); }
.signal-lights span:nth-child(2) { background: rgba(199,160,87,0.86); }
.signal-lights span:nth-child(3) { background: rgba(109,131,214,0.8); }

.interface-grid {
  position: relative; display: grid; grid-template-columns: 1fr 0.92fr; gap: 1rem;
}
.panel-card {
  border-radius: 1.4rem; border: 1px solid var(--border); background: var(--chip-bg);
  padding: 1.2rem; position: relative; overflow: hidden;
}
.constellation, .constellation-lines {
  position: absolute; inset: 0; pointer-events: none;
}
.constellation {
  opacity: 0.7;
  background-image:
    radial-gradient(circle at 22% 28%, rgba(255,255,255,0.92) 0 1px, transparent 1.4px),
    radial-gradient(circle at 45% 46%, rgba(255,255,255,0.82) 0 1px, transparent 1.4px),
    radial-gradient(circle at 63% 35%, rgba(255,255,255,0.72) 0 1px, transparent 1.4px),
    radial-gradient(circle at 76% 58%, rgba(255,255,255,0.72) 0 1px, transparent 1.4px),
    radial-gradient(circle at 36% 72%, rgba(199,160,87,0.82) 0 1.2px, transparent 1.5px);
}
.constellation-lines {
  background:
    linear-gradient(28deg, transparent 44.6%, rgba(255,255,255,0.12) 45%, transparent 45.4%),
    linear-gradient(126deg, transparent 51.4%, rgba(255,255,255,0.10) 51.7%, transparent 52%),
    linear-gradient(77deg, transparent 63.2%, rgba(199,160,87,0.12) 63.5%, transparent 63.8%);
  opacity: 0.6;
}
.interface-copy {
  position: relative; display: grid; min-height: 18rem; align-content: space-between; gap: 1rem;
}
.interface-copy h2, .section-title, .feature-title {
  margin: 0.7rem 0 0; letter-spacing: -0.03em; line-height: 1.08;
}
.interface-copy h2 { max-width: 16ch; font-size: 2rem; }
.notice-stack { display: grid; gap: 0.75rem; }
.notice {
  border-radius: 1rem; border: 1px solid var(--border); background: var(--panel-strong);
  padding: 0.95rem 1rem; font-size: 0.92rem; line-height: 1.75;
}
.interface-side { display: grid; gap: 1rem; }
.metric {
  border-radius: 1.4rem; border: 1px solid var(--border); background: var(--chip-bg); padding: 1.2rem;
}
.metric-number {
  margin-top: 0.7rem; font-size: 2.1rem; font-weight: 700; letter-spacing: -0.05em;
}
.metric-copy {
  margin-top: 0.9rem; font-size: 0.94rem; line-height: 1.8; color: var(--text-soft);
}
.palette-list { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 1rem; }
.palette-chip {
  display: inline-flex; align-items: center; gap: 0.5rem; border-radius: 999px;
  border: 1px solid var(--border); padding: 0.55rem 0.85rem; font-size: 0.7rem;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.swatch { width: 0.8rem; height: 0.8rem; border-radius: 999px; flex: 0 0 auto; }

.section { padding: 2.5rem 0; }
.section-head {
  display: flex; justify-content: space-between; align-items: end; gap: 1rem; margin-bottom: 1.75rem;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem); color: var(--hero-title);
}
.section-action {
  padding: 0.95rem 1.1rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--chip-bg); font-size: 0.7rem; letter-spacing: 0.24em; text-transform: uppercase;
}

.books-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.4rem;
}
.book-card {
  display: block; padding: 1rem; border-radius: 1.7rem;
}
.book-card:hover { box-shadow: 0 18px 44px rgba(12, 18, 33, 0.18); }
html.dark .book-card:hover { box-shadow: 0 18px 44px rgba(0, 0, 0, 0.42); }

.book-cover {
  min-height: 23rem; border-radius: 1.45rem; background: var(--book-bg);
  position: relative; overflow: hidden; display: grid; place-items: center;
}
.book-cover::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 50% 20%, rgba(199,160,87,0.18), transparent 26%),
    radial-gradient(circle at 50% 78%, rgba(70,99,184,0.18), transparent 30%),
    linear-gradient(115deg, transparent 22%, rgba(255,255,255,0.12) 36%, transparent 46%),
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 32%, rgba(199,160,87,0.05) 76%, transparent 100%);
  transform: translateX(-18%);
}
.book-cover::after {
  content: ""; position: absolute; inset: 1rem; border-radius: 1rem;
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: inset 0 0 0 1px rgba(199,160,87,0.08);
}
.slot-badge {
  position: absolute; top: 1rem; left: 1rem; border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.10); background: rgba(0,0,0,0.2);
  color: rgba(255,255,255,0.72); padding: 0.45rem 0.75rem; font-size: 0.62rem;
  text-transform: uppercase; letter-spacing: 0.3em; z-index: 1;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.sigil {
  width: 7.5rem; height: 7.5rem; border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14); position: relative;
  box-shadow: 0 0 44px rgba(70,99,184,0.22), inset 0 0 28px rgba(199,160,87,0.08); z-index: 1;
}
.sigil::before, .sigil::after { content: ""; position: absolute; border-radius: 999px; }
.sigil::before { inset: 14%; border: 1px solid rgba(255,255,255,0.12); }
.sigil::after { inset: 31%; border: 1px solid rgba(199,160,87,0.34); }

.book-meta {
  margin-top: 1rem; display: flex; align-items: end; justify-content: space-between; gap: 1rem;
}
.book-subtitle {
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.28em; color: var(--text-soft);
}
.book-title {
  margin-top: 0.55rem; font-size: 1.25rem; letter-spacing: 0.02em; font-weight: 500;
}
.book-cta {
  border-radius: 999px; border: 1px solid var(--border); padding: 0.7rem 0.85rem;
  font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.22em; white-space: nowrap;
}

.architecture-panel { padding: 1.5rem; border-radius: 2rem; }
.architecture-grid {
  display: grid; grid-template-columns: 0.88fr 1.12fr; gap: 2rem; align-items: start;
}
.section-copy {
  margin-top: 1.1rem; font-size: 1rem; line-height: 1.9; color: var(--text-soft); max-width: 44rem;
}
.section-cards {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem;
}
.section-card {
  border-radius: 1.4rem; border: 1px solid var(--border); background: var(--chip-bg); padding: 1.2rem;
}
.feature-title { font-size: 1.2rem; }
.feature-copy {
  margin-top: 0.8rem; font-size: 0.95rem; line-height: 1.8; color: var(--text-soft);
}

.footer-grid {
  display: grid; grid-template-columns: 1.08fr 0.92fr; gap: 1.4rem; padding-bottom: 5rem;
}
.footer-panel { padding: 1.5rem; border-radius: 1.8rem; }
.nav-layer-stack { margin-top: 1.1rem; display: grid; gap: 0.85rem; }
.nav-layer-item {
  display: flex; align-items: center; gap: 1rem; border-radius: 1.2rem;
  border: 1px solid var(--border); background: var(--panel-strong); padding: 1rem;
}
.nav-layer-number {
  width: 2.5rem; height: 2.5rem; border-radius: 999px; border: 1px solid var(--border);
  display: grid; place-items: center; font-size: 0.88rem; flex: 0 0 auto;
}
.nav-layer-text { font-size: 0.92rem; letter-spacing: 0.08em; }

.placeholder-hero {
  padding: 5rem 0 2rem;
}
.placeholder-wrap {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  gap: 1.5rem;
}
.placeholder-card {
  padding: 2rem;
  border-radius: 2rem;
}
.placeholder-title {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 0.96;
  letter-spacing: -0.05em;
  color: var(--hero-title);
}
.placeholder-text {
  margin: 0 auto;
  max-width: 42rem;
  font-size: 1.04rem;
  line-height: 1.9;
  color: var(--text-soft);
}
.placeholder-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.placeholder-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.placeholder-box {
  padding: 1.2rem;
  border-radius: 1.4rem;
  text-align: left;
}

@media (max-width: 1100px) {
  .hero-grid, .architecture-grid, .footer-grid { grid-template-columns: 1fr; }
  .books-grid, .hero-points, .section-cards, .interface-grid, .placeholder-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .container { width: min(1200px, calc(100% - 1.25rem)); }
  .header-row, .section-head { flex-direction: column; align-items: flex-start; }
  .nav { width: 100%; justify-content: flex-start; }
  .books-grid, .hero-points, .section-cards, .interface-grid, .placeholder-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 1rem; }
  .hero-title { max-width: 100%; }
  .book-cover { min-height: 19rem; }
  .orbital-ring { width: 38rem; height: 38rem; top: -8rem; right: -14rem; }
  .orbital-ring-2 { width: 28rem; height: 28rem; left: -10rem; top: 24rem; }
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(260px, 420px) 1fr;
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
}

.about-portrait {
  display: flex;
  justify-content: center;
}

.portrait-frame {
  width: min(100%, 380px);
  aspect-ratio: 4 / 5;
  border: 1px solid rgba(213, 178, 122, 0.24);
  background: rgba(4, 8, 18, 0.56);
  box-shadow: var(--shadow);
  padding: 0.75rem;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: contrast(1.04) saturate(0.86);
}

.about-copy .section-title {
  max-width: 820px;
}

@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-copy {
    max-width: 760px;
    margin: 0 auto;
  }
}