/* ============================================================
   威廉希尔中心 — 共享样式 /assets/site.css
   页头 · 页脚 · 通用按钮 · 面包屑 · 正文容器 · 基础组件
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --green-deep: #0B2B24;
  --charcoal: #151311;
  --cream: #F5EDE0;
  --cream-light: #FBF6EC;
  --brown: #1C1712;
  --gold: #C9A45C;
  --gold-bright: #E8C77D;
  --cyan: #33D6C5;
  --teal-deep: #0E6B60;
  --ember: #E05A33;
  --sage: #8FA39A;
  --green-mid: #123B31;

  --hairline-gold: rgba(201, 164, 92, 0.28);
  --hairline-soft: rgba(201, 164, 92, 0.16);

  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SF Mono", ui-monospace,
    Menlo, Consolas, "Courier New", monospace;

  --max-width: 1280px;
  --gutter: clamp(1.15rem, 4vw, 3.5rem);
  --radius-lg: clamp(16px, 2.4vw, 28px);
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 180ms;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--brown);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: inherit;
}

p { margin: 0; }

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

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

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

img { height: auto; }

hr {
  border: 0;
  margin: 0;
}

::selection {
  background: var(--gold);
  color: var(--charcoal);
}

/* ---------- 3. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
  border-radius: 4px;
  box-shadow: 0 0 0 1px rgba(11, 43, 36, 0.55);
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-pill);
  background: var(--gold-bright);
  color: var(--charcoal);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器与排版 ---------- */
.container,
.header-shell,
.footer-shell {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.rule {
  display: block;
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, rgba(201, 164, 92, 0.6), rgba(201, 164, 92, 0));
  margin-block: clamp(1.5rem, 4vw, 2.75rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.74rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.btn--gold {
  background: linear-gradient(140deg, var(--gold-bright), var(--gold));
  color: var(--brown);
  box-shadow: 0 12px 26px -18px rgba(201, 164, 92, 0.95);
}

.btn--gold:hover {
  background: var(--gold-bright);
}

.btn--teal {
  background: var(--teal-deep);
  color: #EFFBF8;
}

.btn--teal:hover {
  background: #0B544B;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(201, 164, 92, 0.5);
  color: var(--gold-bright);
}

.btn--ghost:hover {
  background: rgba(201, 164, 92, 0.12);
  border-color: var(--gold);
}

.btn--sm {
  padding: 0.52rem 1.05rem;
  font-size: 0.82rem;
}

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

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--green-deep);
  color: var(--cream);
  border-bottom: 1px solid var(--hairline-gold);
  box-shadow: 0 22px 44px -36px rgba(11, 43, 36, 0.95);
}

.header-upper {
  border-bottom: 1px solid var(--hairline-soft);
}

.header-upper .header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-block: 0.6rem;
  flex: 0 1 auto;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: clamp(1.14rem, 1.7vw, 1.44rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--cream);
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--sage);
  line-height: 1.4;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.2vw, 1.1rem);
  flex: 0 0 auto;
}

.version-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline-gold);
  background: rgba(0, 0, 0, 0.2);
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.32rem 0.72rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.2;
  white-space: nowrap;
}

.version-chip::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.06);
}

.version-chip--screen {
  color: var(--gold-bright);
  background: rgba(201, 164, 92, 0.14);
}

.version-chip--android {
  color: var(--cyan);
  background: rgba(51, 214, 197, 0.1);
}

.header-cta {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(201, 164, 92, 0.35);
  background: transparent;
  color: var(--cream);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(201, 164, 92, 0.12);
  border-color: var(--gold);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 1.05rem;
  height: 10px;
  flex: 0 0 auto;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.site-header[data-open] .nav-toggle-bars::before {
  transform: translateY(4px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  transform: translateY(-4px) rotate(-45deg);
}

.nav-toggle-text {
  display: none;
}

.header-lower {
  background: var(--charcoal);
}

.primary-nav {
  width: 100%;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  padding-block: 0.42rem;
}

.nav-item {
  flex: 0 0 auto;
  display: flex;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.56rem 0.92rem;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--sage);
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav-link::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.45;
  transition: opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--cream);
  background: rgba(201, 164, 92, 0.1);
}

.nav-link:hover::before {
  opacity: 1;
  transform: scale(1.5);
}

.nav-link[aria-current="page"] {
  color: var(--gold-bright);
  background: rgba(201, 164, 92, 0.15);
}

.nav-link[aria-current="page"]::before {
  opacity: 1;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 164, 92, 0.22);
}

.nav-item--tools {
  display: none;
}

.nav-tools {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.nav-tools .version-switch {
  width: 100%;
  justify-content: space-between;
}

.nav-tools .version-chip {
  flex: 1 1 0;
  justify-content: center;
  font-size: 0.74rem;
  padding: 0.42rem 0.5rem;
}

.nav-tools .btn {
  width: 100%;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--charcoal);
  color: var(--cream);
  border-top: 1px solid var(--hairline-gold);
}

.footer-shell {
  padding-top: clamp(2.5rem, 6vw, 4.25rem);
  padding-bottom: 0;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 2.1fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--cream);
}

.footer-tagline {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.footer-flag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.9rem;
  padding: 0.36rem 0.8rem;
  border-radius: var(--radius-pill);
  border: 1px dashed rgba(224, 90, 51, 0.45);
  background: rgba(224, 90, 51, 0.07);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ember);
}

.footer-flag span {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--ember);
  box-shadow: 0 0 0 3px rgba(224, 90, 51, 0.16);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  margin-bottom: 0.9rem;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--sage);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-link {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--cream);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
  overflow-wrap: anywhere;
}

.footer-link:hover {
  color: var(--gold-bright);
  border-bottom-color: rgba(201, 164, 92, 0.6);
}

.footer-list li:first-child .footer-link[href^="mailto"] {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0;
}

.footer-link--tel {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}

.footer-text {
  font-size: 0.92rem;
  line-height: 1.68;
  color: var(--sage);
  overflow-wrap: anywhere;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.5rem;
  padding-block: 1.2rem 1.7rem;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--sage);
}

.footer-icp {
  color: var(--sage);
}

.footer-copy {
  color: var(--sage);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs {
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--sage);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb-link {
  color: inherit;
  border-bottom: 1px solid rgba(143, 163, 154, 0.45);
  transition: color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.breadcrumb-link:hover {
  color: var(--teal-deep);
  border-bottom-color: currentColor;
}

.breadcrumb-sep {
  font-family: var(--font-mono);
  color: rgba(143, 163, 154, 0.65);
}

.breadcrumb-item [aria-current="page"] {
  color: var(--brown);
  font-weight: 600;
}

/* ---------- 9. 正文容器 ---------- */
.prose {
  max-width: 34em;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--brown);
}

.prose > * + * {
  margin-top: 1.05em;
}

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 1.14rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: 0.45em;
}

.prose ul li {
  position: relative;
  padding-left: 1.25em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.42em;
  height: 0.42em;
  border-radius: 50%;
  background: var(--gold);
}

.prose ol {
  counter-reset: prose-ol;
}

.prose ol li {
  position: relative;
  padding-left: 1.8em;
  counter-increment: prose-ol;
}

.prose ol li::before {
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--teal-deep);
}

.prose a {
  color: var(--teal-deep);
  border-bottom: 1px solid rgba(14, 107, 96, 0.35);
  transition: border-color var(--dur) var(--ease);
}

.prose a:hover {
  border-bottom-color: currentColor;
}

.prose strong {
  font-weight: 700;
  color: var(--brown);
}

/* ---------- 10. 图片容器 ---------- */
.figure {
  margin: 0;
  min-width: 0;
}

.figure-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--green-mid);
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(201, 164, 92, 0.18);
}

.figure-media > img,
.figure-media > picture > img,
.figure-media > svg,
.figure-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-media--screen {
  box-shadow: inset 0 0 0 1px rgba(232, 199, 125, 0.3);
}

.figure-media--android {
  box-shadow: inset 0 0 0 1px rgba(51, 214, 197, 0.3);
}

.figure-caption {
  margin-top: 0.75rem;
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--sage);
}

/* ---------- 11. 语义徽标 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge--screen {
  color: var(--gold-bright);
  background: rgba(201, 164, 92, 0.16);
  border-color: rgba(201, 164, 92, 0.38);
}

.badge--android {
  color: var(--cyan);
  background: rgba(51, 214, 197, 0.12);
  border-color: rgba(51, 214, 197, 0.36);
}

.badge--update {
  color: var(--ember);
  background: rgba(224, 90, 51, 0.12);
  border-color: rgba(224, 90, 51, 0.38);
}

/* ---------- 12. 分段切换（标签页） ---------- */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.3rem;
  border-radius: var(--radius-pill);
  background: var(--green-deep);
  border: 1px solid var(--hairline-soft);
}

.segmented-tab {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sage);
  transition: color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.segmented-tab:hover {
  color: var(--cream);
}

.segmented-tab[aria-selected="true"] {
  color: var(--charcoal);
  background: linear-gradient(140deg, var(--gold-bright), var(--gold));
}

.segmented-tab[aria-selected="true"].is-android {
  background: var(--cyan);
  color: #08211D;
}

.segmented-panel[hidden] {
  display: none;
}

/* ---------- 13. 滚动进度与显现 ---------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 90;
  pointer-events: none;
  background: transparent;
}

.scroll-progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

html.js .js-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

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

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1100px) {
  .footer-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem 2rem;
  }
}

@media (max-width: 900px) {
  .header-upper .header-shell {
    min-height: 68px;
    gap: 0.6rem;
  }

  .header-tools > .version-switch,
  .header-tools > .header-cta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-toggle-text {
    display: inline;
  }

  .header-lower {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 68px);
    overflow-y: auto;
    border-bottom: 1px solid var(--hairline-gold);
    box-shadow: 0 30px 60px -34px rgba(0, 0, 0, 0.85);
  }

  .site-header[data-open] .header-lower {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    padding-block: 0.75rem 1.25rem;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.85rem 1rem;
    border-radius: 0.85rem;
    font-size: 1rem;
  }

  .nav-link::before {
    width: 2px;
    height: 1.05em;
    border-radius: 1px;
  }

  .nav-item--tools {
    display: block;
    margin-top: 0.7rem;
    padding-top: 0.95rem;
    border-top: 1px solid var(--hairline-soft);
  }

  .footer-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .brand-tag {
    font-size: 0.66rem;
    letter-spacing: 0.16em;
  }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 560px) {
  .footer-columns {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .segmented {
    width: 100%;
  }

  .segmented-tab {
    flex: 1 1 0;
    text-align: center;
    padding-inline: 0.5rem;
  }
}

@media (max-width: 380px) {
  .brand-name {
    font-size: 1.02rem;
  }

  .nav-toggle {
    padding: 0.5rem 0.7rem;
    letter-spacing: 0.08em;
  }
}

/* ---------- 15. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  html.js .js-reveal {
    opacity: 1;
    transform: none;
  }

  .scroll-progress {
    display: none;
  }

  .skip-link {
    transition: none;
  }
}