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

:root {
  --c-deep: #0B2E4F;
  --c-abyss: #061B2F;
  --c-sea: #E8F1F7;
  --c-mist: #F7FAFC;
  --c-coral: #FF6B3D;
  --c-coral-deep: #C2410C;
  --c-coral-sand: #FFE3D8;
  --c-celadon: #2E8B6F;
  --c-celadon-pale: #DDF1E8;
  --c-warm: #DCD5CC;
  --c-ink: #1B2A38;
  --line: rgba(11, 46, 79, 0.14);
  --line-soft: rgba(11, 46, 79, 0.08);
  --shadow: 0 6px 18px rgba(11, 46, 79, 0.06);
  --r: 4px;
  --rail: 88px;
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  font-weight: 400;
  color: var(--c-ink);
  background-color: var(--c-sea);
  min-height: 100vh;
}

body.is-locked { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--c-deep);
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(34px, 5.2vw, 56px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 24px); }
h4 { font-size: 18px; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--c-coral-deep); }
a:hover { color: var(--c-coral); }

ul, ol { margin: 0 0 1em; padding-left: 1.2em; }

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

button { font: inherit; }

#main-content { display: block; }

/* ---------- 焦点 ---------- */
:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 2px;
  border-radius: 2px;
}
.rail:focus { outline: none; }

/* ---------- 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}
@media (min-width: 768px) {
  .wrap { padding-left: 36px; padding-right: 36px; }
}

.section { padding-top: 56px; padding-bottom: 56px; }
.section--tight { padding-top: 32px; padding-bottom: 32px; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.divider {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 32px 0;
}

.prose { max-width: 42em; }
.prose p { max-width: 38em; }

.lede {
  font-size: 17px;
  line-height: 1.9;
  color: rgba(27, 42, 56, 0.84);
  max-width: 38em;
}

.stack > * + * { margin-top: 16px; }

/* ---------- 文字装饰 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--c-coral-deep);
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  display: block;
  width: 24px;
  height: 1px;
  background: currentColor;
}

.vertical-note {
  writing-mode: vertical-rl;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3em;
  line-height: 1;
  color: rgba(11, 46, 79, 0.45);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn--coral { background: var(--c-coral); color: #0B2E4F; }
.btn--coral:hover { background: var(--c-coral-deep); color: var(--c-mist); }
.btn--ghost { background: transparent; color: var(--c-deep); border-color: var(--line); }
.btn--ghost:hover { background: var(--c-sea); border-color: var(--c-deep); color: var(--c-deep); }
.btn--deep { background: var(--c-deep); color: var(--c-mist); }
.btn--deep:hover { background: var(--c-abyss); color: var(--c-mist); }
.btn--block { width: 100%; }

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--c-sea);
  color: var(--c-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.6;
}
.tag--coral { background: var(--c-coral-sand); color: var(--c-coral-deep); border-color: rgba(194, 65, 12, 0.28); }
.tag--celadon { background: var(--c-celadon-pale); color: var(--c-celadon); border-color: rgba(46, 139, 111, 0.28); }
.tag--warm { background: var(--c-warm); color: var(--c-deep); border-color: rgba(11, 46, 79, 0.16); }

.status-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-celadon);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: var(--c-coral);
  color: #0B2E4F;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.6;
  border-radius: 2px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}

/* ---------- 网格 ---------- */
.grid { display: grid; gap: 24px; grid-template-columns: 1fr; }
.grid--cards { gap: 20px; }
@media (min-width: 640px) {
  .grid--cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 900px) {
  .grid--7-5 { grid-template-columns: 7fr 5fr; }
  .grid--5-7 { grid-template-columns: 5fr 7fr; }
}
@media (min-width: 1024px) {
  .grid--cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 图片容器基础 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(140deg, #E8F1F7 0%, #D9E6EF 100%);
  margin: 0;
}
.media > img,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--cover { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media__caption {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(11, 46, 79, 0.5);
}

/* ---------- 堆叠面板体系 ---------- */
.panels { display: flex; flex-direction: column; }
.panels > .panel { margin-top: -24px; }
.panels > .panel:first-child { margin-top: 0; }

.panel {
  position: relative;
  padding: 28px 22px;
  background: var(--c-mist);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
}
@media (min-width: 768px) {
  .panel { padding: 40px 36px; }
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 18px;
}
.panel__num {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border: 1px solid rgba(194, 65, 12, 0.32);
  border-radius: 2px;
  background: var(--c-coral-sand);
  color: var(--c-coral-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.7;
}
.panel__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 900;
  line-height: 1.15;
  color: var(--c-deep);
}

/* ---------- 头部 ---------- */
.site-header {
  position: relative;
  z-index: 60;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 2px;
  background: var(--c-coral);
  color: #0B2E4F;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; color: #0B2E4F; }

/* 侧边轨道 */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #0B2E4F 0%, #061B2F 100%);
  color: var(--c-mist);
  border-right: 1px solid rgba(247, 250, 252, 0.1);
  z-index: 70;
}
.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(100deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 12px);
}
.rail__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding: 18px 0 16px;
  gap: 0;
}

.rail__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--c-mist);
  text-decoration: none;
}
.rail__brand:hover { color: var(--c-mist); }
.rail__brand-mark {
  display: block;
  width: 2px;
  height: 22px;
  background: var(--c-coral);
}
.rail__brand-name {
  writing-mode: vertical-rl;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.32em;
  line-height: 1;
}

.rail__nav {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  width: 100%;
  margin-top: 20px;
  overflow-y: auto;
  scrollbar-width: none;
}
.rail__nav::-webkit-scrollbar { display: none; }
.rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.rail__item { width: 100%; }

.rail__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 10px 2px;
  border-left: 2px solid transparent;
  color: rgba(247, 250, 252, 0.66);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.rail__link:hover {
  color: var(--c-mist);
  background: rgba(247, 250, 252, 0.06);
}
.rail__link[aria-current="page"] {
  color: var(--c-mist);
  border-left-color: var(--c-coral);
  background: rgba(255, 227, 216, 0.1);
}
.rail__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.02em;
  line-height: 1;
  color: rgba(247, 250, 252, 0.38);
}
.rail__link[aria-current="page"] .rail__idx { color: var(--c-coral); }
.rail__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.25;
  white-space: nowrap;
}

.rail__foot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding-top: 12px;
}
.rail__sub {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(247, 250, 252, 0.62);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.rail__sub:hover {
  color: var(--c-coral);
  border-bottom-color: var(--c-coral);
}
.rail__meta { display: none; }
.rail__phone {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}
.rail__icp { font-size: 11px; letter-spacing: 0.04em; color: rgba(247, 250, 252, 0.5); }

/* 顶部细窄栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 250, 252, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(120%) blur(6px);
  -webkit-backdrop-filter: saturate(120%) blur(6px);
}
.topbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 8px 16px;
}

.topbar__brand {
  display: block;
  margin-right: auto;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--c-deep);
  text-decoration: none;
}
.topbar__brand:hover { color: var(--c-deep); }

.crumb {
  display: none;
  align-items: center;
  gap: 8px;
  margin-right: auto;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(11, 46, 79, 0.6);
}
.crumb__home {
  color: rgba(11, 46, 79, 0.62);
  text-decoration: none;
}
.crumb__home:hover {
  color: var(--c-coral-deep);
  text-decoration: underline;
}
.crumb__sep { color: rgba(11, 46, 79, 0.26); }
.crumb__current {
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.06em;
}

.topbar__quick {
  display: none;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--c-mist);
  color: var(--c-deep);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.chip:hover {
  background: var(--c-sea);
  border-color: var(--c-deep);
  color: var(--c-deep);
}
.chip--coral {
  background: var(--c-coral);
  color: #0B2E4F;
  font-weight: 700;
  border-color: transparent;
  clip-path: polygon(7px 0, 100% 0, 100% 100%, 0 100%);
}
.chip--coral:hover {
  background: var(--c-coral-deep);
  color: var(--c-mist);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  margin-left: auto;
  border: 1px solid var(--c-deep);
  border-radius: 2px;
  background: var(--c-deep);
  cursor: pointer;
}
.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-mist);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(6, 27, 47, 0.56);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.nav-scrim[data-visible] { opacity: 1; pointer-events: auto; }

/* ---------- 移动端抽屉 ---------- */
@media (max-width: 959px) {
  .rail {
    width: min(84vw, 320px);
    transform: translateX(-104%);
    transition: transform 0.2s ease;
    box-shadow: 0 6px 18px rgba(6, 27, 47, 0.4);
    border-right: 1px solid rgba(247, 250, 252, 0.14);
  }
  .rail[data-open] { transform: translateX(0); }

  .rail__inner {
    align-items: stretch;
    padding: 20px 18px 24px;
    overflow-y: auto;
  }
  .rail__brand {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(247, 250, 252, 0.14);
  }
  .rail__brand-mark { width: 22px; height: 2px; }
  .rail__brand-name {
    writing-mode: horizontal-tb;
    font-size: 15px;
    letter-spacing: 0.14em;
  }
  .rail__nav {
    align-items: flex-start;
    margin-top: 10px;
  }
  .rail__list { gap: 0; }
  .rail__link {
    flex-direction: row;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 4px;
    border-left: none;
    border-bottom: 1px solid rgba(247, 250, 252, 0.08);
  }
  .rail__link[aria-current="page"] {
    border-left: none;
    border-bottom-color: var(--c-coral);
    background: rgba(255, 227, 216, 0.1);
  }
  .rail__idx { font-size: 11px; color: rgba(247, 250, 252, 0.34); }
  .rail__label { font-size: 14px; letter-spacing: 0.08em; }

  .rail__foot {
    align-items: flex-start;
    gap: 8px;
    margin-top: auto;
    padding-top: 20px;
  }
  .rail__meta {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-top: 4px;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  body { padding-left: var(--rail); }

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

  .topbar__brand { display: none; }
  .crumb { display: flex; }
  .topbar__quick { display: flex; }

  .topbar__inner {
    gap: 20px;
    min-height: 56px;
    padding: 0 36px;
  }
  .skip-link { left: calc(var(--rail) + 12px); }
}

@media (max-width: 959px) {
  .crumb { display: none; }
  .topbar__quick { display: none; }
  .topbar__brand { display: block; }
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 72px;
  background: linear-gradient(180deg, #0B2E4F 0%, #061B2F 100%);
  color: var(--c-mist);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-coral) 0 14%, var(--c-celadon) 14% 24%, rgba(247, 250, 252, 0.12) 24% 100%);
}
.footer__glow {
  position: absolute;
  right: -8%;
  bottom: -42%;
  width: min(720px, 82vw);
  height: 340px;
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(255, 107, 61, 0.2), transparent 72%);
}

.footer__grid {
  position: relative;
  z-index: 1;
  max-width: 1180px;
  margin: 0 auto;
  padding: 52px 20px 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
@media (min-width: 560px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); padding-left: 28px; padding-right: 28px; }
}
@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1.35fr 0.8fr 1.25fr 0.8fr;
    gap: 40px;
    padding: 60px 36px 36px;
  }
}

.footer__col {
  min-width: 0;
  padding-top: 18px;
  border-top: 1px solid rgba(247, 250, 252, 0.14);
}

.footer__brand {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--c-mist);
  text-decoration: none;
}
.footer__brand:hover { color: var(--c-coral); }

.footer__lede {
  margin: 0 0 16px;
  max-width: 24em;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(247, 250, 252, 0.66);
}

.footer__title {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
  line-height: 1.6;
  color: rgba(247, 250, 252, 0.5);
}

.footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer__list--contact { gap: 14px; }

.footer__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 250, 252, 0.78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.footer__link:hover {
  color: var(--c-coral);
  border-bottom-color: var(--c-coral);
}

.footer__link--action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 8px 14px;
  border: 1px solid rgba(247, 250, 252, 0.3);
  border-radius: 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-mist);
}
.footer__link--action:hover {
  background: var(--c-coral);
  border-color: var(--c-coral);
  border-bottom-color: var(--c-coral);
  color: #0B2E4F;
}

.footer__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.footer__label {
  font-size: 11px;
  letter-spacing: 0.24em;
  line-height: 1.6;
  color: rgba(247, 250, 252, 0.42);
}
.footer__value {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 250, 252, 0.88);
  overflow-wrap: anywhere;
}
.footer__value--mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
}

.footer__note {
  margin: 14px 0 0;
  max-width: 27em;
  font-size: 12px;
  line-height: 1.8;
  color: rgba(247, 250, 252, 0.5);
}

.footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px 16px;
  padding: 16px 20px 22px;
  border-top: 1px solid rgba(247, 250, 252, 0.12);
  font-size: 12px;
  line-height: 1.8;
  text-align: center;
  color: rgba(247, 250, 252, 0.45);
}
.footer__icp { letter-spacing: 0.04em; }
.footer__copy { letter-spacing: 0.04em; }

/* ---------- 显现协议 ---------- */
[data-reveal] {
  transition: opacity 0.2s ease, transform 0.2s ease;
}
[data-reveal="pending"] {
  opacity: 0;
  transform: translateY(8px);
}
[data-reveal="shown"] {
  opacity: 1;
  transform: none;
}

/* ---------- 降低动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal="pending"] { opacity: 1; transform: none; }
}