:root {
  --ink-deep: #07141a;
  --ink: #0c1f28;
  --ink-mid: #14303c;
  --mist: #8fa8b0;
  --paper: #e6ddd0;
  --paper-dim: #b8aea0;
  --copper: #c4783a;
  --copper-bright: #e09552;
  --teal-glow: #2a6b72;
  --line: rgba(230, 221, 208, 0.14);
  --font-display: "Noto Serif TC", "Noto Serif SC", "Songti TC", serif;
  --font-latin: "Cormorant Garamond", "Times New Roman", serif;
  --font-body: "Zen Kaku Gothic New", "Noto Sans TC", "Noto Sans SC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --nav-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--paper);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.7;
  background: var(--ink-deep);
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 80;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* —— Nav —— */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), border-color 0.4s;
  border-bottom: 1px solid transparent;
}

.site-nav.is-scrolled {
  background: rgba(7, 20, 26, 0.82);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.nav-brand span {
  font-family: var(--font-latin);
  font-style: italic;
  font-weight: 500;
  color: var(--copper-bright);
  margin-left: 0.25rem;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--paper-dim);
  transition: color 0.25s;
}

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

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(230, 221, 208, 0.28);
  padding: 0.15rem;
  gap: 0.1rem;
}

.lang-btn {
  min-width: 2.1rem;
  min-height: 1.85rem;
  padding: 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--paper-dim);
  transition: color 0.2s, background 0.2s;
}

.lang-btn:hover,
.lang-btn:focus-visible {
  color: var(--paper);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 2px;
}

.lang-btn.is-active {
  background: rgba(196, 120, 58, 0.22);
  color: var(--copper-bright);
}

html[data-lang="hans"] {
  --font-display: "Noto Serif SC", "Noto Serif TC", "Songti SC", serif;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  flex-direction: column;
  justify-content: center;
  gap: 0.45rem;
}

.nav-toggle span {
  display: block;
  height: 1px;
  background: var(--paper);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(0.28rem) rotate(40deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-0.28rem) rotate(-40deg);
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  padding: calc(var(--nav-h) + 2rem) clamp(1.25rem, 5vw, 4rem) 4.5rem;
  overflow: hidden;
}

.hero-sky {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 45% at 72% 18%, rgba(196, 120, 58, 0.28), transparent 55%),
    radial-gradient(ellipse 50% 40% at 18% 30%, rgba(42, 107, 114, 0.35), transparent 50%),
    linear-gradient(180deg, #0a1820 0%, #122a34 38%, #1a3340 62%, #0d1c22 100%);
  transform: translateY(calc(var(--scroll-y, 0) * 0.15px));
  will-change: transform;
}

.hero-mountains {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: min(58vh, 520px);
  pointer-events: none;
}

.mtn {
  position: absolute;
  left: 0;
  width: 100%;
  bottom: 0;
  fill: #0a151b;
}

.mtn-back {
  height: 100%;
  opacity: 0.45;
  fill: #12303a;
  transform: translateY(calc(var(--scroll-y, 0) * 0.08px));
}

.mtn-mid {
  height: 88%;
  opacity: 0.75;
  fill: #0d222b;
  transform: translateY(calc(var(--scroll-y, 0) * 0.05px));
}

.mtn-front {
  height: 70%;
  fill: #07141a;
}

.hero-mist {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, rgba(7, 20, 26, 0.85) 70%, var(--ink-deep));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 40rem;
  animation: hero-in 1.1s var(--ease) both;
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.85rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.25;
}

.hero-brand em {
  font-family: var(--font-latin);
  font-style: italic;
  font-weight: 500;
  color: var(--copper-bright);
  letter-spacing: 0.04em;
}

.hero-title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 4.75rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.18em;
}

.hero-title-sub {
  display: block;
  margin-top: 0.85rem;
  font-family: var(--font-latin);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  font-weight: 500;
  font-style: italic;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 28rem;
  color: var(--paper-dim);
  font-size: 1.05rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 1.5rem;
  font-size: 0.88rem;
  letter-spacing: 0.16em;
  transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.25s var(--ease);
}

.btn:focus-visible {
  outline: 2px solid var(--copper-bright);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--copper);
  color: #1a0f08;
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--copper-bright);
  transform: translateY(-1px);
}

.btn-ghost {
  border: 1px solid rgba(230, 221, 208, 0.35);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: var(--paper);
  background: rgba(230, 221, 208, 0.06);
}

.hero-scroll {
  position: absolute;
  right: clamp(1.25rem, 5vw, 4rem);
  bottom: 2rem;
  z-index: 2;
  writing-mode: vertical-rl;
  font-size: 0.72rem;
  letter-spacing: 0.35em;
  color: var(--mist);
  opacity: 0.7;
  animation: pulse-soft 2.8s ease-in-out infinite;
}

/* —— Sections —— */
.section {
  position: relative;
  padding: clamp(4.5rem, 12vw, 7.5rem) clamp(1.25rem, 5vw, 4rem);
}

.section-inner {
  max-width: 68rem;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 0.85rem;
  font-family: var(--font-latin);
  font-size: 0.92rem;
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--copper-bright);
}

.section h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.25;
}

.section-lead {
  margin: 0;
  max-width: 38rem;
  color: var(--paper-dim);
  font-size: 1.08rem;
}

.world {
  background:
    linear-gradient(180deg, var(--ink-deep), var(--ink) 40%, var(--ink-mid));
}

.pillars {
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 2.5rem;
  border-top: 1px solid var(--line);
  padding-top: 2.5rem;
}

.pillars li {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.pillars strong {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.14em;
  font-weight: 600;
}

.pillars span {
  color: var(--paper-dim);
  font-size: 0.98rem;
}

.sects {
  background:
    radial-gradient(ellipse 60% 50% at 100% 0%, rgba(42, 107, 114, 0.18), transparent 55%),
    var(--ink-mid);
}

.sect-rail {
  margin-top: 2.75rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.sect {
  padding: 1.75rem 1.5rem 1.75rem 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.sect:nth-child(3n) {
  border-right: 0;
  padding-right: 0;
}

.sect:nth-child(n + 4) {
  border-bottom: 0;
  padding-top: 2rem;
}

.sect h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.sect p {
  margin: 0;
  color: var(--paper-dim);
  font-size: 0.96rem;
}

.sect-note {
  margin: 2rem 0 0;
  color: var(--mist);
  font-size: 0.92rem;
}

.combat {
  background:
    linear-gradient(120deg, rgba(196, 120, 58, 0.08), transparent 40%),
    var(--ink);
}

.combat-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: end;
}

.combat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
  padding-left: 1.75rem;
}

.combat-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--paper-dim);
}

.combat-list li:first-child {
  padding-top: 0;
}

.combat-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.combat-list strong {
  display: inline-block;
  min-width: 3.2rem;
  margin-right: 0.5rem;
  font-family: var(--font-latin);
  font-style: italic;
  color: var(--copper-bright);
  letter-spacing: 0.04em;
}

.start {
  background: var(--ink-deep);
}

.steps {
  list-style: none;
  margin: 2.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.steps li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.steps li:last-child {
  border-bottom: 1px solid var(--line);
}

.step-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.steps strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  margin-bottom: 0.35rem;
}

.steps p {
  margin: 0;
  color: var(--paper-dim);
}

.arch {
  background:
    radial-gradient(ellipse 55% 70% at 50% 120%, rgba(196, 120, 58, 0.16), transparent 60%),
    linear-gradient(180deg, var(--ink), var(--ink-deep));
}

.arch-panel {
  max-width: 42rem;
  text-align: center;
}

.arch .eyebrow,
.arch h2 {
  text-align: center;
}

.arch h2 {
  letter-spacing: 0.28em;
}

.arch-lead {
  margin: 0 auto 1.25rem;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  line-height: 1.75;
  color: var(--paper);
}

.arch-lead strong {
  color: var(--copper-bright);
  font-weight: 700;
}

.arch-sub {
  margin: 0 auto 1.5rem;
  max-width: 36rem;
  color: var(--paper-dim);
  font-size: 1rem;
}

.arch-en {
  margin: 0;
  font-family: var(--font-latin);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* —— Footer —— */
.site-footer {
  padding: 3.5rem clamp(1.25rem, 5vw, 4rem) 3rem;
  border-top: 1px solid var(--line);
  background: #050e12;
}

.footer-inner {
  max-width: 68rem;
  margin: 0 auto;
}

.footer-brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  letter-spacing: 0.14em;
  font-size: 1.05rem;
}

.footer-note {
  margin: 0;
  max-width: 40rem;
  color: var(--mist);
  font-size: 0.88rem;
}

.footer-note p {
  margin: 0;
}

.footer-note p + p {
  margin-top: 0.35rem;
}

.footer-meta,
.footer-site {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  color: var(--mist);
}

.footer-meta {
  margin-top: 1.25rem;
  font-size: 0.88rem;
  opacity: 0.75;
}

.footer-site {
  margin-top: 0.45rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  opacity: 0.6;
}

/* —— Reveal —— */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes pulse-soft {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 0.9;
  }
}

@media (max-width: 900px) {
  .pillars,
  .sect-rail,
  .combat-grid {
    grid-template-columns: 1fr;
  }

  .sect {
    border-right: 0;
    padding-right: 0;
  }

  .sect:nth-child(n + 4) {
    border-bottom: 1px solid var(--line);
    padding-top: 1.75rem;
  }

  .sect:last-child {
    border-bottom: 0;
  }

  .combat-list {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 0.5rem;
  }
}

@media (max-width: 720px) {
  .site-nav {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .nav-brand {
    grid-column: 1;
  }

  .nav-tools {
    grid-column: 2;
    justify-self: end;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0 1rem;
    background: rgba(7, 20, 26, 0.96);
    border-bottom: 1px solid var(--line);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 0.9rem clamp(1.25rem, 4vw, 3rem);
  }

  .hero-scroll {
    display: none;
  }

  .steps li {
    grid-template-columns: 3rem 1fr;
  }
}

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

  .reveal,
  .hero-content,
  .hero-scroll,
  .hero-sky,
  .mtn-back,
  .mtn-mid {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}