:root {
  color-scheme: light;
  --ink: #1c1a18;
  --muted: #6f6359;
  --paper: #fff8ef;
  --paper-strong: #fffdf8;
  --rail: #171412;
  --rail-soft: #332a25;
  --signal: #bb2f2f;
  --brass: #c4913b;
  --teal: #128b90;
  --sky: #dff3f5;
  --line: rgba(43, 34, 27, 0.16);
  --shadow: 0 20px 56px rgba(41, 25, 14, 0.16);
  --radius: 8px;
  --max: 1180px;
  font-family: "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 14%, rgba(196, 145, 59, 0.16), transparent 22rem),
    linear-gradient(180deg, #fff9f0 0%, #f5ecde 52%, #eef7f7 100%);
  min-width: 320px;
}

body,
button,
input {
  letter-spacing: 0;
}

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

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

p,
h1,
h2,
h3 {
  overflow-wrap: anywhere;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(28, 26, 24, 0.12);
  background: rgba(255, 248, 239, 0.88);
  backdrop-filter: blur(16px);
}

.site-header__inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-weight: 800;
}

.brand img {
  width: auto;
  height: auto;
  max-width: 40px;
  max-height: 40px;
  object-fit: contain;
}

.brand span {
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--rail-soft);
}

.site-nav a {
  padding: 10px 12px;
  border-radius: var(--radius);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgba(196, 145, 59, 0.14);
  outline: none;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-strong);
  color: var(--ink);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: calc(100svh - 68px);
  overflow: hidden;
  display: grid;
  align-items: center;
  isolation: isolate;
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.9), rgba(255, 248, 239, 0.54) 48%, rgba(255, 248, 239, 0.96)),
    linear-gradient(120deg, rgba(187, 47, 47, 0.12), transparent 46%),
    linear-gradient(260deg, rgba(18, 139, 144, 0.18), transparent 36%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  opacity: 0.28;
  background-image:
    linear-gradient(90deg, rgba(28, 26, 24, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(28, 26, 24, 0.05) 1px, transparent 1px);
  background-size: 74px 74px;
  transform: skewY(-3deg) scale(1.08);
}

.hero__inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(42px, 7vw, 96px) 0 clamp(160px, 22vw, 236px);
}

.hero__copy {
  max-width: 760px;
  position: relative;
  z-index: 3;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--signal);
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero h1,
.subhero h1 {
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 6.8rem);
  line-height: 0.96;
  font-weight: 900;
  color: var(--rail);
}

.hero__lead {
  margin: 24px 0 0;
  max-width: 700px;
  font-size: clamp(1.05rem, 2vw, 1.42rem);
  line-height: 1.76;
  color: #3e352e;
}

.hero__actions,
.download-panel__actions,
.subhero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 800;
  line-height: 1.2;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.btn--primary {
  background: var(--rail);
  color: #fffaf4;
  box-shadow: 0 14px 28px rgba(23, 20, 18, 0.22);
}

.btn--signal {
  background: var(--signal);
  color: #fff;
  box-shadow: 0 14px 28px rgba(187, 47, 47, 0.22);
}

.btn--ghost {
  background: rgba(255, 253, 248, 0.74);
  border-color: rgba(28, 26, 24, 0.18);
  color: var(--rail);
}

.btn__icon {
  width: 1.15em;
  height: 1.15em;
  display: inline-grid;
  place-items: center;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.18);
}

.btn__text {
  display: grid;
  gap: 2px;
  text-align: left;
}

.btn__subtext {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.1;
}

.hero__rail {
  position: absolute;
  left: 50%;
  bottom: -176px;
  width: min(980px, 112vw);
  height: auto;
  transform: translateX(-50%);
  z-index: 2;
  filter: drop-shadow(0 18px 18px rgba(23, 20, 18, 0.18));
}

.rail-bed {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 86px;
  background:
    repeating-linear-gradient(90deg, transparent 0 30px, rgba(255, 248, 239, 0.25) 30px 40px),
    linear-gradient(180deg, #2b211c, #161210);
  z-index: 0;
}

.rail-bed::before,
.rail-bed::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 5px;
  background: #80613c;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.22);
}

.rail-bed::before {
  top: 16px;
}

.rail-bed::after {
  top: 46px;
}

.content-section {
  padding: clamp(56px, 8vw, 96px) 0;
}

.content-section--tight {
  padding-top: clamp(40px, 6vw, 72px);
}

.section-inner,
.section-heading,
.module-grid,
.category-rails,
.download-panel,
.module-nav,
.footer__inner {
  width: min(var(--max), calc(100% - 32px));
  margin-inline: auto;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading h2,
.module-band h3 {
  margin: 0;
  font-size: clamp(1.7rem, 3.4vw, 3rem);
  line-height: 1.08;
  color: var(--rail);
}

.section-heading p {
  margin: 14px 0 0;
  max-width: 720px;
  color: var(--muted);
  line-height: 1.8;
}

.feature-grid {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-card,
.module-card,
.ability-card,
.module-band,
.download-panel,
.module-nav a {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.78);
  box-shadow: 0 12px 32px rgba(41, 25, 14, 0.08);
}

.feature-card {
  padding: 22px;
  min-height: 174px;
  display: grid;
  align-content: start;
  gap: 12px;
  border-top: 4px solid var(--accent, var(--brass));
}

.feature-card span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent, var(--brass)) 18%, white);
  color: var(--accent, var(--brass));
  font-weight: 900;
}

.feature-card h3 {
  margin: 0;
  font-size: 1.08rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.66;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.module-card {
  min-height: 218px;
  padding: 18px;
  display: grid;
  align-content: start;
  gap: 10px;
  position: relative;
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.module-card::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 5px;
  background: var(--accent);
}

.module-card:hover,
.module-card:focus-visible {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 44%, var(--line));
  box-shadow: var(--shadow);
  outline: none;
}

.module-card img {
  width: auto;
  height: auto;
  max-width: 72px;
  max-height: 72px;
  justify-self: start;
  align-self: center;
  object-fit: contain;
}

.module-card__marker {
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
}

.module-card__title {
  font-size: 1.2rem;
  font-weight: 900;
}

.module-card__subtitle {
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.95rem;
}

.category-rails {
  display: grid;
  gap: 14px;
}

.module-band {
  padding: 20px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: center;
}

.module-band__links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.module-band__links a {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius);
  background: rgba(245, 236, 222, 0.62);
  border: 1px solid transparent;
  font-weight: 800;
}

.module-band__links a:hover,
.module-band__links a:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--line));
  outline: none;
}

.module-band__links img {
  width: auto;
  height: auto;
  max-width: 40px;
  max-height: 40px;
  flex: 0 0 auto;
  object-fit: contain;
}

.download-section {
  background:
    linear-gradient(180deg, rgba(23, 20, 18, 0.04), rgba(18, 139, 144, 0.08)),
    rgba(255, 253, 248, 0.34);
}

.download-panel {
  padding: clamp(24px, 4vw, 42px);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(255, 253, 248, 0.92), rgba(223, 243, 245, 0.8)),
    var(--paper-strong);
}

.download-panel h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.08;
}

.download-panel p {
  color: var(--muted);
  line-height: 1.76;
}

.download-panel__status {
  display: grid;
  gap: 10px;
}

.ticket-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(28, 26, 24, 0.24);
}

.ticket-row span {
  color: var(--muted);
}

.ticket-row strong {
  text-align: right;
}

.release-note {
  display: none;
  color: var(--signal);
  font-weight: 700;
}

.release-fallback .release-note {
  display: block;
}

.subhero {
  min-height: 58svh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 440px);
  gap: 32px;
  align-items: center;
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(40px, 7vw, 88px) 0;
}

.subhero__copy p:not(.eyebrow) {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.78;
}

.back-link {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--rail-soft);
  font-weight: 800;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--signal);
  outline: none;
}

.subhero__visual {
  min-height: 360px;
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.82), rgba(245, 236, 222, 0.88)),
    radial-gradient(circle at 74% 24%, color-mix(in srgb, var(--accent) 18%, white), transparent 11rem);
  overflow: hidden;
}

.subhero__visual::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 38px;
  height: 56px;
  background:
    repeating-linear-gradient(90deg, transparent 0 28px, rgba(255, 248, 239, 0.32) 28px 38px),
    linear-gradient(180deg, #342923, #171412);
}

.subhero__sign {
  position: absolute;
  left: 18px;
  top: 18px;
  max-width: calc(100% - 36px);
  padding: 8px 10px;
  border-radius: var(--radius);
  background: var(--rail);
  color: #fffaf4;
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.subhero__icon {
  position: absolute;
  left: 28px;
  bottom: 78px;
  width: clamp(112px, 38%, 180px);
  height: auto;
  filter: drop-shadow(0 14px 16px rgba(23, 20, 18, 0.16));
}

.ability-grid {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.ability-card {
  padding: 18px;
  min-height: 150px;
  border-top: 4px solid var(--accent);
}

.ability-card span {
  color: var(--accent);
  font-weight: 900;
}

.ability-card p {
  margin: 12px 0 0;
  line-height: 1.64;
}

.module-nav {
  padding: 0 0 clamp(56px, 8vw, 96px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.module-nav a {
  padding: 18px;
  border-left: 5px solid var(--accent);
}

.module-nav span {
  display: block;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 6px;
}

.module-nav strong {
  font-size: 1.25rem;
}

.module-page--missing {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 80px 0;
}

.site-footer {
  color: rgba(255, 250, 244, 0.74);
  background: var(--rail);
  border-top: 8px solid var(--brass);
}

.footer__inner {
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer__inner a {
  color: #fffaf4;
  font-weight: 800;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .feature-grid,
  .module-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .module-band,
  .download-panel,
  .subhero {
    grid-template-columns: 1fr;
  }

  .module-band__links,
  .ability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .subhero__visual {
    min-height: 300px;
  }
}

@media (max-width: 760px) {
  .site-header__inner {
    min-height: 62px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    display: none;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 253, 248, 0.98);
    box-shadow: var(--shadow);
  }

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

  .hero {
    min-height: calc(100svh - 150px);
  }

  .hero__inner {
    padding-top: 30px;
    padding-bottom: clamp(210px, 58vw, 300px);
  }

  .content-section {
    padding: 24px 0 44px;
  }

  .hero h1,
  .subhero h1 {
    font-size: clamp(2.45rem, 15vw, 4.4rem);
  }

  .hero__lead,
  .subhero__copy p:not(.eyebrow) {
    font-size: 1rem;
  }

  .hero__actions,
  .download-panel__actions,
  .subhero__actions {
    display: grid;
  }

  .btn {
    width: 100%;
  }

  .hero__rail {
    bottom: 12px;
    width: min(calc(100vw - 28px), 560px);
    max-width: calc(100vw - 28px);
  }

  .feature-grid,
  .module-grid,
  .module-band__links,
  .ability-grid,
  .module-nav {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .module-card,
  .ability-card {
    min-height: 0;
  }

  .module-card {
    grid-template-columns: minmax(0, 1fr) 96px;
    grid-template-areas:
      "marker icon"
      "title icon"
      "subtitle icon";
    column-gap: 16px;
    align-items: center;
    min-height: 164px;
    padding: 22px 18px;
  }

  .module-card img {
    grid-area: icon;
    max-width: 84px;
    max-height: 84px;
    justify-self: center;
  }

  .module-card__marker {
    grid-area: marker;
    text-align: center;
  }

  .module-card__title {
    grid-area: title;
    text-align: center;
  }

  .module-card__subtitle {
    grid-area: subtitle;
    font-size: 0.9rem;
    text-align: center;
  }

  .subhero__visual {
    min-height: 270px;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}