/* =========================================================
   九洲平台 · 共享样式表 /assets/site.css
   框架导航 + 服务地图长卷 + 切角面板 + 等宽数字
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; }

/* ---------- 2. Tokens ---------- */
:root {
  --blue: #123B5D;
  --green: #1F7A6A;
  --mist: #DCEBE6;
  --warm: #F7F3EA;
  --gold: #C99A4A;
  --ink: #0E2233;
  --sand: #EADFC9;
  --signal: #C95F35;
  --grey: #6B7A78;

  --line: rgba(18, 59, 93, 0.16);
  --line-strong: rgba(18, 59, 93, 0.34);
  --line-light: rgba(247, 243, 234, 0.18);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --maxw: 1180px;
  --gutter: clamp(1.1rem, 4vw, 3rem);
  --radius-cut: 18px;
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  background: var(--warm);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h1 { font-size: clamp(2rem, 5.2vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
p { text-wrap: pretty; }
strong, b { font-weight: 800; }
::selection { background: var(--gold); color: var(--ink); }

.mono, code, kbd, samp { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
.sr-only {
  position: absolute; 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;
}

@media (min-width: 1280px) {
  body { padding-left: 10px; }
}

/* ---------- 4. 跳至主要内容 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: -6rem;
  transform: translateX(-50%);
  z-index: 300;
  padding: 0.7rem 1.4rem;
  background: var(--ink);
  color: var(--warm);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  border-bottom: 3px solid var(--gold);
  transition: top 0.22s ease;
}
.skip-link:focus { top: 0; }

/* ---------- 5. 框架式头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--blue);
  color: var(--warm);
  border-bottom: 1px solid rgba(247, 243, 234, 0.12);
}
.frame-edge {
  display: none;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 10px;
  z-index: 90;
  pointer-events: none;
  background: linear-gradient(180deg,
    var(--green) 0 30%,
    var(--blue) 30% 76%,
    var(--gold) 76% 100%);
}
@media (min-width: 1280px) {
  .frame-edge { display: block; }
}
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(247, 243, 234, 0.14);
  pointer-events: none;
}
.header-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--green) 0%, var(--gold) 100%);
  transition: width 0.14s linear;
}
.header-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0 var(--gutter);
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--warm);
  flex: none;
}
.brand-mark {
  position: relative;
  width: 36px;
  height: 36px;
  flex: none;
  background: linear-gradient(150deg, var(--green) 0%, var(--blue) 74%);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
  box-shadow: inset 0 0 0 1px rgba(247, 243, 234, 0.28);
}
.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--gold);
}
.brand-mark::before {
  left: 22%;
  right: 30%;
  top: 50%;
  height: 2px;
  transform: translateY(-50%) rotate(-26deg);
}
.brand-mark::after {
  left: 22%;
  right: 46%;
  top: 72%;
  height: 2px;
  opacity: 0.65;
  transform: rotate(-26deg);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 1.05rem; font-weight: 800; letter-spacing: 0.16em; }
.brand-line {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  color: rgba(220, 235, 230, 0.72);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.8rem;
  color: var(--warm);
  border: 1px solid rgba(247, 243, 234, 0.38);
  background: rgba(247, 243, 234, 0.06);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}
.nav-toggle:hover { background: rgba(247, 243, 234, 0.16); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--warm);
  transition: transform 0.24s ease, opacity 0.24s ease;
}
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
}
.site-header[data-open] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.6rem;
}
.nav-list { display: flex; align-items: center; gap: 0.15rem; }
.nav-item { flex: none; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.42rem;
  padding: 0.6rem 0.62rem 0.65rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(247, 243, 234, 0.8);
  transition: color 0.2s ease, background-color 0.2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0.62rem;
  right: 0.62rem;
  bottom: 0.3rem;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease, background-color 0.28s ease;
}
.nav-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(220, 235, 230, 0.6);
  transition: color 0.2s ease;
}
.nav-link:hover { color: var(--warm); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link:hover .nav-num { color: var(--mist); }
.nav-link[aria-current="page"] {
  color: var(--warm);
  background: rgba(247, 243, 234, 0.1);
}
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--gold);
}
.nav-link[aria-current="page"] .nav-num { color: var(--gold); }

/* 登录入口 */
.login-entry {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.56rem 1.15rem;
  background: var(--warm);
  color: var(--blue);
  font-weight: 800;
  font-size: 0.92rem;
  letter-spacing: 0.05em;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.login-entry::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 12px;
  height: 12px;
  background: var(--blue);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}
.login-entry:hover {
  background: var(--gold);
  color: var(--ink);
  transform: translateY(-1px);
}
.login-entry__arrow {
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}
.login-entry:hover .login-entry__arrow { transform: translateX(3px); }

/* ---------- 6. 头部移动端 ---------- */
@media (max-width: 960px) {
  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 0.75rem;
    min-height: 66px;
    padding-block: 0.55rem;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    grid-column: 1 / -1;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
    margin: 0;
    padding: 0.75rem 0 1rem;
    border-top: 1px solid var(--line-light);
    max-height: calc(100dvh - 80px);
    overflow-y: auto;
  }
  .site-header[data-open] .site-nav {
    display: flex;
    animation: navDrop 0.26s ease both;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    display: flex;
    width: 100%;
    padding: 0.8rem 0.5rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(247, 243, 234, 0.1);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    background: rgba(31, 122, 106, 0.42);
    box-shadow: inset 3px 0 0 var(--gold);
  }
  .nav-num { width: 2rem; font-size: 0.72rem; }
  .login-entry { align-self: flex-start; margin-top: 0.4rem; }
}
@keyframes navDrop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}
@media (max-width: 420px) {
  .brand-line { display: none; }
  .brand-name { font-size: 0.98rem; letter-spacing: 0.1em; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(2.5rem, 7vw, 6rem);
  background: var(--blue);
  color: rgba(247, 243, 234, 0.8);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--green) 0 44%,
    var(--gold) 44% 53%,
    rgba(247, 243, 234, 0.2) 53% 100%);
}
.footer-contours {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg,
    rgba(220, 235, 230, 0.07) 0 1px,
    transparent 1px 46px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 68%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 68%);
}
.footer-inner {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(2.4rem, 5vw, 3.8rem) var(--gutter) 2rem;
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 900px) {
  .footer-inner { grid-template-columns: minmax(220px, 0.9fr) 2fr; align-items: start; }
}
.footer-brand { display: grid; gap: 0.65rem; align-content: start; }
.footer-brand__link { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--warm); }
.footer-brand__mark {
  width: 30px;
  height: 30px;
  flex: none;
  background: linear-gradient(150deg, var(--green), var(--gold));
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.footer-brand__name { font-size: 1.2rem; font-weight: 800; letter-spacing: 0.16em; }
.footer-brand__line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: rgba(220, 235, 230, 0.62);
}
.footer-brand__tag {
  justify-self: start;
  margin-top: 0.2rem;
  padding: 0.22rem 0.7rem 0.22rem 0.6rem;
  border-left: 3px solid var(--gold);
  background: rgba(201, 154, 74, 0.14);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.footer-columns {
  display: grid;
  gap: 1.6rem 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 700px) {
  .footer-columns { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.footer-col__title {
  position: relative;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--warm);
  padding-bottom: 0.5rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--line-light);
}
.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 26px;
  height: 2px;
  background: var(--gold);
}
.footer-col__list { display: grid; gap: 0.42rem; }
.footer-link {
  position: relative;
  display: inline-block;
  padding-left: 0.95rem;
  font-size: 0.88rem;
  color: rgba(247, 243, 234, 0.72);
  transition: color 0.2s ease;
}
.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.42rem;
  height: 1px;
  background: var(--green);
  transition: width 0.22s ease, background-color 0.22s ease;
}
.footer-link:hover { color: var(--warm); }
.footer-link:hover::before { width: 0.72rem; background: var(--gold); }

.footer-contact {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 1.6rem var(--gutter) 1.4rem;
  display: grid;
  gap: 0.9rem 2rem;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-light);
}
@media (min-width: 760px) {
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1080px) {
  .footer-contact { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.contact-item { display: grid; gap: 0.15rem; }
.contact-item__key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}
.contact-item__value { font-size: 0.87rem; line-height: 1.6; color: rgba(247, 243, 234, 0.88); }

.footer-bottom {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.5rem;
  border-top: 1px solid var(--line-light);
}
.legal-list { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.3rem; }
.legal-link {
  font-size: 0.82rem;
  color: rgba(247, 243, 234, 0.82);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(201, 154, 74, 0.65);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
.legal-link:hover { color: var(--warm); text-decoration-color: var(--gold); }
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: rgba(220, 235, 230, 0.58);
}
.footer-note {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0.9rem var(--gutter) 2.2rem;
  border-top: 1px dashed rgba(247, 243, 234, 0.14);
  font-size: 0.76rem;
  line-height: 1.7;
  color: rgba(220, 235, 230, 0.54);
}

/* ---------- 8. 布局容器与分区 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 820px; }
.section { padding-block: clamp(2.4rem, 6vw, 5rem); }
.section--mist { background: var(--mist); }
.section--sand { background: var(--sand); }
.section--blue { background: var(--blue); color: rgba(247, 243, 234, 0.9); }
.section--blue .chapter-title,
.section--blue h2,
.section--blue h3 { color: var(--warm); }
.section--blue .eyebrow { color: var(--gold); }
.section--blue .chapter-rule { background: linear-gradient(90deg, var(--gold), transparent); }
.section--blue .prose { color: rgba(247, 243, 234, 0.86); }

/* ---------- 9. 章节开口 ---------- */
.chapter-head {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}
.chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--green);
}
.chapter-title { font-size: clamp(1.5rem, 3.2vw, 2.35rem); }
.chapter-rule {
  flex: 1 1 120px;
  height: 2px;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, var(--green), rgba(18, 59, 93, 0.1) 70%, transparent);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--green);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--gold);
}
.lede {
  max-width: 62ch;
  font-size: clamp(1.05rem, 2.1vw, 1.3rem);
  line-height: 1.72;
  color: #17394f;
}
.prose {
  max-width: 74ch;
  font-size: 1.0625rem;
  line-height: 1.85;
}
.prose p + p { margin-top: 1.1em; }
.prose h2 { font-size: clamp(1.35rem, 2.4vw, 1.7rem); margin-top: 1.9em; margin-bottom: 0.6em; }
.prose h3 { font-size: 1.15rem; margin-top: 1.6em; margin-bottom: 0.5em; }
.prose ul, .prose ol { margin-top: 0.9em; display: grid; gap: 0.45rem; }
.prose ul li { position: relative; padding-left: 1.3rem; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 0.55rem;
  height: 2px;
  background: var(--green);
}
.prose a { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }
.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(1.5rem, 4vw, 2.6rem);
  background: linear-gradient(90deg, var(--green), rgba(18, 59, 93, 0.14) 42%, transparent);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 1rem 0;
  font-size: 0.84rem;
  color: var(--grey);
}
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.45rem; }
.breadcrumb__item[aria-current="page"] { color: var(--ink); font-weight: 600; }
.breadcrumb__link {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.breadcrumb__link:hover { color: var(--blue); }
.breadcrumb__sep { color: rgba(107, 122, 120, 0.7); }

/* ---------- 11. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.78rem 1.4rem;
  background: var(--blue);
  color: var(--warm);
  font-weight: 700;
  font-size: 0.94rem;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-left: 3px solid var(--gold);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--green); color: var(--warm); border-left-color: var(--gold); }
.btn--primary:hover { background: #18695c; }
.btn--accent { background: var(--gold); color: var(--ink); border-left-color: var(--blue); }
.btn--accent:hover { background: #b98a3f; }
.btn--line {
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--green);
}
.btn--line:hover { background: var(--blue); color: var(--warm); border-color: var(--blue); }

/* ---------- 12. 面板 / 说明牌 / 标签 ---------- */
.panel {
  position: relative;
  padding: clamp(1.2rem, 3vw, 2rem);
  background: var(--warm);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--radius-cut)) 0, 100% var(--radius-cut), 100% 100%, var(--radius-cut) 100%, 0 calc(100% - var(--radius-cut)));
}
.panel--mist { background: var(--mist); }
.panel--dark { background: var(--blue); color: rgba(247, 243, 234, 0.9); border-color: rgba(247, 243, 234, 0.2); }
.note-plate {
  position: relative;
  padding: 1.05rem 1.3rem 1.05rem 1.55rem;
  background: var(--sand);
  border-left: 4px solid var(--gold);
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--ink);
}
.note-plate::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 0;
  width: 4px;
  height: 38%;
  background: var(--green);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.62rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  background: var(--mist);
  color: var(--green);
  border: 1px solid rgba(31, 122, 106, 0.32);
}
.tag--gold { background: rgba(201, 154, 74, 0.18); color: #7F5C1C; border-color: rgba(201, 154, 74, 0.45); }
.tag--signal { background: rgba(201, 95, 53, 0.14); color: #A8492A; border-color: rgba(201, 95, 53, 0.38); }

/* ---------- 13. 索引卡 ---------- */
.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(196px, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}
.index-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.1rem 1.05rem 1.25rem;
  background: var(--warm);
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.index-card:hover { background: var(--mist); }
.index-card__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--green);
}
.index-card__title { font-size: 1rem; font-weight: 800; letter-spacing: 0.02em; }

/* ---------- 14. 图片容器基础 ---------- */
.figure {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--mist);
  background-image:
    repeating-linear-gradient(115deg, rgba(31, 122, 106, 0.16) 0 1px, transparent 1px 22px),
    linear-gradient(140deg, #DCEBE6 0%, #F7F3EA 56%, #EADFC9 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.figure__img,
.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.figure__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: min(100%, 30rem);
  padding: 0.55rem 0.95rem;
  background: rgba(14, 34, 51, 0.84);
  color: var(--warm);
  font-size: 0.78rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
}
.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 3 / 4; }
.figure--square { aspect-ratio: 1 / 1; }
@media (max-width: 680px) {
  .figure, .figure--wide { aspect-ratio: 4 / 3; }
}

/* ---------- 15. 网格 ---------- */
.grid { display: grid; gap: clamp(1rem, 2.5vw, 1.75rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--asym > * { grid-column: span 12; min-width: 0; }
@media (max-width: 1023px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
}
@media (min-width: 768px) {
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-12 { grid-column: span 12; }
}

/* ---------- 16. 标签页 ---------- */
.tabs { margin-block: 1.4rem; }
.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.7rem;
  border-bottom: 2px solid rgba(18, 59, 93, 0.14);
}
.tab {
  padding: 0.55rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--blue);
  background: transparent;
  border: 1px solid rgba(18, 59, 93, 0.22);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.tab:hover { background: var(--mist); }
.tab[aria-selected="true"] {
  background: var(--green);
  border-color: var(--green);
  color: var(--warm);
  transform: translateY(-1px);
}
.tabpanel { padding-top: 1.25rem; animation: tabIn 0.26s ease both; }
.tabpanel[hidden] { display: none; }
@keyframes tabIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 17. 显现动效 ---------- */
.reveal-ready {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal-ready.is-revealed { opacity: 1; transform: none; }

/* ---------- 18. 减少动效 ---------- */
@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;
  }
  .reveal-ready { opacity: 1 !important; transform: none !important; }
  .header-progress__bar { transition: none !important; }
}