/* ==========================================================================
   华体登录服务 — 共享样式表 /assets/site.css
   控制台外壳 + 纸本内页：墨绿仪表带、刻度线、编号、斜切分区
   ========================================================================== */

/* 1. Reset
   ========================================================================== */
*,
*::before,
*::after { box-sizing: border-box; }

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

body { margin: 0; }

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

ul[class],
ol[class] { list-style: none; padding: 0; }

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

::selection { background: var(--mint); color: #04231A; }

/* 2. 设计令牌
   ========================================================================== */
:root {
  --ink: #0B1F1A;
  --ink-2: #14332B;
  --ink-3: #1B4137;
  --orange: #FF6A1F;
  --orange-soft: #FF8347;
  --mint: #2FE0A8;
  --silver: #C9D2CE;
  --mist: #EDF0EE;
  --cream: #F4EFE3;
  --brown: #1A1512;
  --red: #D9482F;
  --glass: rgba(8, 26, 22, 0.86);

  --line-dark: rgba(201, 210, 206, 0.22);
  --line-dark-soft: rgba(201, 210, 206, 0.12);
  --line-light: rgba(26, 21, 18, 0.16);

  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Roboto Mono", Consolas, "Courier New", monospace;

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --tick: 24px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* 3. 基础排版
   ========================================================================== */
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--brown);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: 0.04em;
  font-weight: 800;
}

h1 { font-size: clamp(44px, 6.4vw, 88px); line-height: 1.02; }
h2 { font-size: clamp(28px, 3.4vw, 44px); }
h3 { font-size: clamp(22px, 2.2vw, 28px); }
h4 { font-size: 20px; font-weight: 700; }

p { max-width: 62ch; }

.t-display {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.02;
}

.t-lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.72;
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  display: inline-block;
}

/* 4. 跳转链接
   ========================================================================== */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--mint);
  color: #04231A;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 180ms ease-out;
}

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

/* 5. 焦点可见
   ========================================================================== */
:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* 6. 页头
   ========================================================================== */
.site-header {
  --header-h: 84px;
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--glass);
  color: var(--silver);
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(16px) saturate(130%);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
  transition: background 220ms ease-out, box-shadow 220ms ease-out,
              backdrop-filter 220ms ease-out;
}

.site-header.is-solid {
  --header-h: 64px;
  background: var(--ink);
  box-shadow: 0 18px 44px -32px #000;
}

.site-header__bar {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  transition: min-height 220ms ease-out;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  text-decoration: none;
  color: var(--cream);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: var(--mint);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  transition: transform 220ms var(--ease);
}

.brand:hover .brand__mark,
.brand:focus-visible .brand__mark { transform: translateY(-2px); }

.brand__text { display: grid; gap: 2px; }

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver);
  opacity: 0.78;
  line-height: 1.2;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--line-dark);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 180ms ease-out, color 180ms ease-out;
}

.nav-toggle:hover { border-color: var(--mint); color: var(--mint); }

.nav-toggle__glyph {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__glyph span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: currentColor;
  transition: transform 200ms var(--ease), opacity 160ms linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__glyph span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 30px);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 24px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__item { display: block; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 1px;
  text-decoration: none;
  color: var(--silver);
  font-size: 15px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 160ms ease-out;
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(201, 210, 206, 0.55);
  transition: color 160ms ease-out;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 200ms var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--cream); }

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }

.site-nav__link:hover .site-nav__idx,
.site-nav__link:focus-visible .site-nav__idx { color: var(--orange); }

.site-nav__link[aria-current="page"] {
  color: var(--mint);
  font-weight: 600;
}

.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--mint); }

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--mint);
}

.site-nav__cta { flex: none; }

/* 滚动刻度尺 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--line-dark-soft);
  pointer-events: none;
}

.scroll-meter__fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--mint), var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
}

/* 7. 页脚
   ========================================================================== */
.site-footer {
  margin-top: clamp(56px, 8vw, 112px);
  background: var(--ink);
  color: var(--silver);
  position: relative;
}

.site-footer__edge {
  height: 16px;
  border-top: 1px solid var(--line-dark);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 210, 206, 0.4) 0 1px,
    transparent 1px var(--tick)
  );
  background-size: var(--tick) 8px;
  background-repeat: repeat-x;
  background-position: 0 0;
}

.site-footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) clamp(30px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 52px);
}

.site-footer__brand { min-width: 0; }

.site-footer__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: 16px;
  background: var(--orange);
  color: #170A02;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.site-footer__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--cream);
  line-height: 1.3;
}

.site-footer__tag {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mint);
}

.site-footer__note {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(201, 210, 206, 0.72);
}

.site-footer__cta { margin-top: 22px; }

.site-footer__col { min-width: 0; }

.site-footer__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--silver);
  padding-bottom: 12px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line-dark);
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__link {
  display: inline-block;
  padding: 7px 0;
  font-size: 15px;
  color: var(--silver);
  text-decoration: none;
  transition: color 160ms ease-out, transform 180ms var(--ease);
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
  color: var(--orange);
  transform: translateX(4px);
}

.site-footer__base {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 22px var(--gutter) 36px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px 32px;
  font-size: 13px;
  line-height: 1.8;
}

.site-footer__contact {
  max-width: 62ch;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(201, 210, 206, 0.82);
}

.site-footer__contact-key {
  color: var(--mint);
  letter-spacing: 0.12em;
}

.site-footer__meta {
  max-width: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(201, 210, 206, 0.66);
}

.site-footer__meta .site-footer__link {
  padding: 0;
  font-size: 12.5px;
  color: rgba(201, 210, 206, 0.8);
}

.site-footer__meta .site-footer__link:hover { transform: none; }

.site-footer__sep { color: rgba(201, 210, 206, 0.34); }

/* 8. 布局容器与网格
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.section--dark { background: var(--ink); color: var(--silver); }
.section--mist { background: var(--mist); color: var(--brown); }
.section--cream { background: var(--cream); color: var(--brown); }

.section--dark .eyebrow { color: var(--orange); }
.section--dark h2,
.section--dark h3 { color: var(--cream); }

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--3-9 { grid-template-columns: 3fr 9fr; }

.rule {
  height: 1px;
  border: 0;
  background: var(--line-dark);
  margin-block: clamp(20px, 3vw, 32px);
}

.rule--light { background: var(--line-light); }

/* 9. 按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease-out, color 180ms ease-out,
              border-color 180ms ease-out, transform 180ms var(--ease);
}

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

.btn--primary {
  background: var(--orange);
  color: #170A02;
}

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

.btn--mint {
  background: var(--mint);
  color: #04231A;
}

.btn--mint:hover,
.btn--mint:focus-visible { background: #6BEFC4; }

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
}

.section--mist .btn--ghost,
.section--cream .btn--ghost,
.tone-light .btn--ghost {
  border-color: var(--line-light);
  color: var(--brown);
}

.section--mist .btn--ghost:hover,
.section--cream .btn--ghost:hover,
.tone-light .btn--ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn--block { width: 100%; }

/* 10. 状态标签
   ========================================================================== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 10px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.7;
  white-space: nowrap;
}

.chip::before {
  content: "";
  width: 6px;
  height: 6px;
  background: currentColor;
  flex: none;
}

.chip--stable { color: var(--mint); }
.chip--standard { color: var(--orange); }
.chip--alert { color: var(--red); }

.tone-light .chip--stable,
.section--mist .chip--stable,
.section--cream .chip--stable { color: #0F7A5A; }

.tone-light .chip--standard,
.section--mist .chip--standard,
.section--cream .chip--standard { color: #C24A0F; }

/* 11. 面包屑
   ========================================================================== */
.breadcrumbs {
  padding-block: 18px;
  border-bottom: 1px solid var(--line-light);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  color: rgba(26, 21, 18, 0.62);
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-inline: 10px;
  color: rgba(26, 21, 18, 0.3);
}

.breadcrumbs__item a {
  text-decoration: none;
  transition: color 160ms ease-out;
}

.breadcrumbs__item a:hover { color: var(--orange); }

.breadcrumbs__item[aria-current="page"] { color: var(--brown); }

/* 12. 正文块
   ========================================================================== */
.prose { max-width: 62ch; }

.prose p + p { margin-top: 1.1em; }

.prose h2,
.prose h3 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

.prose ul,
.prose ol {
  padding-left: 1.3em;
  margin-top: 0.8em;
}

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.prose a:hover { color: var(--orange); }

.prose blockquote {
  margin: 1.6em 0;
  padding-left: 20px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  color: rgba(26, 21, 18, 0.72);
}

/* 13. 索引路线
   ========================================================================== */
.index-link {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  border-top: 1px solid var(--line-dark);
  text-decoration: none;
  color: var(--silver);
  font-size: 15px;
  line-height: 1.6;
  transition: color 160ms ease-out, padding-left 200ms var(--ease);
}

.index-link:last-child { border-bottom: 1px solid var(--line-dark); }

.index-link:hover,
.index-link:focus-visible {
  color: var(--cream);
  padding-left: 6px;
}

.index-link.is-active {
  color: var(--mint);
  padding-left: 6px;
}

.index-link__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(201, 210, 206, 0.6);
}

.index-link.is-active .index-link__num { color: var(--mint); }

.index-link--light {
  color: var(--brown);
  border-top-color: var(--line-light);
}

.index-link--light:last-child { border-bottom-color: var(--line-light); }

.index-link--light:hover,
.index-link--light:focus-visible { color: var(--orange); }

.index-link--light .index-link__num { color: rgba(26, 21, 18, 0.45); }

.index-link--light.is-active { color: var(--orange); }
.index-link--light.is-active .index-link__num { color: var(--orange); }

/* 14. 图片容器（页面阶段填充 src 与 alt）
   ========================================================================== */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
}

.media-frame > img,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--cream {
  background: var(--mist);
  border-color: var(--line-light);
}

.media-frame--flat { border: 0; }

/* 15. 滚动显现
   ========================================================================== */
[data-reveal] {
  transition: opacity 480ms var(--ease), transform 480ms var(--ease);
}

html[data-reveal-ready] [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translateY(14px);
}

/* 16. 响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .site-nav__idx { display: none; }
  .site-nav__link { font-size: 14px; }
}

@media (max-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .site-footer__brand { grid-column: 1 / -1; }
  .site-footer__note { max-width: 48ch; }
}

@media (max-width: 920px) {
  .site-header { --header-h: 66px; }
  .site-header.is-solid { --header-h: 58px; }

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

  .site-nav {
    flex-basis: 100%;
    order: 4;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    transition: max-height 260ms var(--ease), opacity 200ms ease-out,
                visibility 0s linear 260ms;
  }

  .site-nav[data-open] {
    max-height: 78vh;
    opacity: 1;
    visibility: visible;
    overflow-y: auto;
    padding-block: 6px 22px;
    transition-delay: 0s;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { border-top: 1px solid var(--line-dark-soft); }

  .site-nav__link {
    display: flex;
    justify-content: flex-start;
    gap: 12px;
    padding: 14px 2px;
    font-size: 16px;
  }

  .site-nav__idx { display: inline-block; }

  .site-nav__link::after {
    bottom: 0;
    height: 1px;
  }

  .site-nav__cta {
    margin-top: 18px;
    width: 100%;
  }

  .grid--5-7,
  .grid--7-5,
  .grid--8-4,
  .grid--3-9 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .brand__tag { display: none; }
  .brand__mark { width: 34px; height: 34px; font-size: 12px; }

  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__base { flex-direction: column; }

  .site-footer__contact { font-size: 12px; }
}

@media (max-width: 380px) {
  .site-footer__inner { grid-template-columns: 1fr; }
}

/* 17. 减弱动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  html[data-reveal-ready] [data-reveal]:not(.is-in) {
    opacity: 1;
    transform: none;
  }

  .scroll-meter__fill { transition: none; }
}