/* ============================================================
   多盈 route-duoying.com.cn — 共享外壳样式 /assets/site.css
   路线图母题：深海蓝底 + 纸白索引卡 + 珊瑚橙出口 + 薄荷绿状态点
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, dl, dd, figure, blockquote, pre {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
}

/* ---------- 2. 变量 ---------- */
:root {
  --sea-900: #071A2B;
  --sea-800: #0D2A42;
  --sea-700: #133B5C;
  --sea-500: #2F6F9F;
  --paper: #F5F0E4;
  --ink: #111820;
  --coral: #F26B4A;
  --coral-deep: #C94E33;
  --mint: #5FD3A6;
  --mist: #8FA3B5;

  --line: rgba(143, 163, 181, 0.32);
  --line-strong: rgba(143, 163, 181, 0.56);
  --line-paper: rgba(17, 24, 32, 0.22);

  --font-head: "Inter", "Helvetica Neue", "Segoe UI", system-ui,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-num: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", monospace;

  --wrap: 1280px;
  --pad-x: clamp(16px, 4vw, 48px);
  --stack-1: 12px;
  --stack-2: 24px;
  --radius: 2px;
  --dur: 0.28s;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 中文排版基础 ---------- */
html { scroll-padding-top: 96px; }

body {
  background: var(--sea-900);
  color: rgba(245, 240, 228, 0.9);
  font-family: var(--font-body);
  font-size: clamp(16px, 0.35vw + 15px, 17px);
  line-height: 1.75;
  letter-spacing: 0.012em;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.018em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5vw, 60px); line-height: 1.08; }
h2 { font-size: clamp(24px, 2.8vw, 34px); }
h3 { font-size: clamp(19px, 1.6vw, 23px); }
h4 { font-size: 17px; letter-spacing: 0; }

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

a {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
}

strong, b { font-weight: 800; color: var(--paper); }

::selection {
  background: var(--mint);
  color: var(--sea-900);
}

[id] { scroll-margin-top: 96px; }

:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  display: inline-block;
  padding: 10px 16px;
  background: var(--mint);
  color: var(--sea-900);
  font-weight: 800;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-160%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus-visible,
.skip-link:focus {
  transform: translateY(0);
  outline-color: var(--sea-900);
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--sea-800);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 44px);
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 12px var(--pad-x);
  min-height: 78px;
}

/* 品牌署名 + 站点圆点 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}

.brand-node {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--mint);
  border-radius: 50%;
}

.brand-node::before {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--mint);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.brand-tag {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

/* 中间虚线路径 */
.header-path {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  min-width: 24px;
}

.path-dot {
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sea-500);
}

.path-dash {
  flex: 1 1 auto;
  height: 0;
  margin: 0 8px;
  border-top: 1px dashed rgba(143, 163, 181, 0.42);
}

/* 移动路标按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle-box {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background var(--dur) var(--ease);
}

.nav-toggle-box::before,
.nav-toggle-box::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle-box::before { top: -6px; }
.nav-toggle-box::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-box { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-box::before {
  top: 0;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-box::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-toggle-label { line-height: 1; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  flex: 0 0 auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.9vw, 12px);
  margin: 0;
  padding: 0;
}

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

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 5px 13px;
  color: rgba(245, 240, 228, 0.8);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  bottom: 6px;
  height: 2px;
  background: transparent;
  transition: background var(--dur) var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { background: var(--coral-deep); }

.nav-link[aria-current="page"] { color: var(--mint); }
.nav-link[aria-current="page"]::after { background: var(--mint); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 11px 18px;
  background: var(--coral);
  color: var(--sea-900);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--coral-deep);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.nav-cta::after {
  content: "→";
  font-family: var(--font-body);
  transition: transform var(--dur) var(--ease);
}

.nav-cta:hover {
  background: var(--paper);
  color: var(--sea-900);
  box-shadow: 3px 3px 0 var(--coral-deep);
}

.nav-cta:hover::after { transform: translateX(4px); }

/* 阅读路线进度线（贴在页头下沿） */
.read-route {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  pointer-events: none;
  overflow: hidden;
}

.read-route__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--sea-800);
  border-top: 1px solid var(--line);
  padding-top: clamp(36px, 5vw, 64px);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    rgba(242, 107, 74, 0.68) 0 16px,
    transparent 16px 32px
  );
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--pad-x) clamp(32px, 4vw, 52px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-name {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--paper);
  text-decoration: none;
}

.footer-name::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(95, 211, 166, 0.16);
}

.footer-tag {
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.footer-meta {
  font-size: 13px;
  line-height: 1.9;
  color: rgba(245, 240, 228, 0.58);
  font-family: var(--font-num);
  letter-spacing: 0.02em;
}

.footer-heading {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.footer-links {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  align-self: flex-start;
  padding-bottom: 2px;
  color: rgba(245, 240, 228, 0.82);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-link::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sea-500);
  transition: background var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  border-bottom-color: var(--mist);
}

.footer-link:hover::before { background: var(--coral); }

.footer-link[aria-current="page"] { color: var(--mint); }
.footer-link[aria-current="page"]::before { background: var(--mint); }

/* 独立出口模块 */
.footer-exit {
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--coral);
  color: var(--sea-900);
  border: 1px solid rgba(7, 26, 43, 0.42);
  border-radius: var(--radius);
  box-shadow: var(--stack-1) var(--stack-1) 0 rgba(7, 26, 43, 0.5);
}

.exit-kicker {
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.28em;
  color: rgba(7, 26, 43, 0.72);
}

.exit-title {
  margin-bottom: 6px;
  font-size: clamp(20px, 2vw, 23px);
  font-weight: 800;
  color: var(--sea-900);
  letter-spacing: -0.01em;
}

.exit-note {
  margin-bottom: 14px;
  font-size: 13px;
  color: rgba(7, 26, 43, 0.78);
}

.exit-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  background: var(--sea-900);
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.exit-cta::after {
  content: "→";
  font-family: var(--font-body);
  transition: transform var(--dur) var(--ease);
}

.exit-cta:hover { background: var(--sea-700); }
.exit-cta:hover::after { transform: translateX(4px); }

.exit-contact {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  font-size: 13px;
}

.exit-contact-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px dashed rgba(7, 26, 43, 0.36);
}

.exit-contact-label {
  flex: 0 0 34px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: rgba(7, 26, 43, 0.7);
}

.exit-contact-value {
  color: var(--sea-900);
  letter-spacing: 0.01em;
  overflow-wrap: anywhere;
}

/* 页脚底行 */
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--pad-x) 28px;
  border-top: 1px dashed rgba(143, 163, 181, 0.3);
  font-size: 13px;
  color: rgba(245, 240, 228, 0.6);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-num);
  letter-spacing: 0.02em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
}

.footer-legal-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-legal-link:hover {
  color: var(--paper);
  border-bottom-color: var(--coral);
}

/* ---------- 7. 通用布局组件 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section {
  padding-block: clamp(44px, 6vw, 84px);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 28px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.section-head > h2 { margin: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.26em;
  color: var(--mint);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 0;
  border-top: 1px dashed currentColor;
}

.rule-dash {
  height: 0;
  margin-block: clamp(24px, 4vw, 44px);
  border: 0;
  border-top: 1px dashed rgba(143, 163, 181, 0.4);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(20px, 3.4vw, 48px);
  align-items: start;
}

.split--reverse {
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}

/* ---------- 8. 面板与纸面 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: var(--sea-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.panel--lift:hover,
.panel--lift:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.panel--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line-paper);
  box-shadow: var(--stack-1) var(--stack-1) 0 rgba(7, 26, 43, 0.45);
}

.panel--paper h1,
.panel--paper h2,
.panel--paper h3,
.panel--paper h4 { color: var(--ink); }

.panel--paper a { color: var(--coral-deep); }
.panel--paper strong { color: var(--ink); }

/* ---------- 9. 动作按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.btn::after {
  content: "→";
  font-family: var(--font-body);
  transition: transform var(--dur) var(--ease);
}

.btn:hover::after { transform: translateX(4px); }

.btn--coral {
  background: var(--coral);
  color: var(--sea-900);
  box-shadow: 4px 4px 0 var(--coral-deep);
}

.btn--coral:hover {
  background: var(--paper);
  box-shadow: 4px 4px 0 var(--coral-deep);
}

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

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

.btn--mint {
  background: var(--mint);
  color: var(--ink);
}

.btn--mint:hover { background: var(--paper); }

/* ---------- 10. 标签 / 步骤编号 ---------- */
.label-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  background: rgba(245, 240, 228, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: rgba(245, 240, 228, 0.84);
}

.label-tag::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.label-tag--blue { border-color: rgba(47, 111, 159, 0.85); color: #9BC4E2; }
.label-tag--coral { border-color: rgba(242, 107, 74, 0.8); color: var(--coral); }
.label-tag--mint { border-color: rgba(95, 211, 166, 0.8); color: var(--mint); }

.step-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(44px, 7vw, 96px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--sea-500);
}

.step-num--mint { color: var(--mint); }

/* ---------- 11. 正文阅读列 ---------- */
.prose {
  max-width: 74ch;
  font-size: clamp(16px, 0.3vw + 15px, 17.5px);
  line-height: 1.85;
  color: rgba(245, 240, 228, 0.9);
}

.prose > * + * { margin-top: 1em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(23px, 2.2vw, 30px);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 20px;
}

.prose ul,
.prose ol {
  padding-left: 1.4em;
  list-style: revert;
}

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

.prose a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.prose blockquote {
  padding-left: 16px;
  border-left: 3px solid var(--coral);
  color: var(--mist);
}

.prose--paper { color: rgba(17, 24, 32, 0.88); }
.prose--paper strong { color: var(--ink); }
.prose--paper a { color: var(--coral-deep); }
.prose--paper blockquote { color: rgba(17, 24, 32, 0.66); }

/* ---------- 12. 面包屑 ---------- */
.breadcrumb { padding-top: 18px; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--sea-500);
}

.breadcrumb-link {
  color: rgba(245, 240, 228, 0.72);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb-link:hover {
  color: var(--paper);
  border-bottom-color: var(--coral);
}

.breadcrumb-item [aria-current="page"] { color: var(--paper); }

/* ---------- 13. 图片容器基础（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--sea-700);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(245, 240, 228, 0.34);
  pointer-events: none;
}

.media-frame__caption {
  position: absolute;
  left: 8px;
  bottom: 8px;
  z-index: 1;
  max-width: calc(100% - 16px);
  padding: 5px 10px;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
}

.figure { margin: 0; }

.figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 14. 可展开研究板 ---------- */
.accordion {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.accordion__item { border-bottom: 1px solid var(--line); }

.accordion__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 18px 0;
  background: none;
  border: 0;
  color: inherit;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.accordion__trigger::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 0.62em;
  border-radius: 50%;
  background: var(--mist);
  transition: background var(--dur) var(--ease);
}

.accordion__trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1;
  color: var(--mist);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.accordion__trigger:hover { color: var(--paper); }

.accordion__trigger[aria-expanded="true"]::before { background: var(--mint); }
.accordion__trigger[aria-expanded="true"]::after {
  content: "−";
  color: var(--mint);
}

.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur) var(--ease);
}

.accordion__item[data-open] .accordion__panel { grid-template-rows: 1fr; }

.accordion__body {
  overflow: hidden;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 240, 228, 0.82);
}

.accordion__body > :first-child { margin-top: 0; }

.accordion__item[data-open] .accordion__body {
  padding-bottom: 20px;
  transition: padding-bottom var(--dur) var(--ease);
}

/* ---------- 15. 滚动显现（无 JS 时保持可见） ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1080px) {
  .brand-tag { display: none; }
  .nav-link { font-size: 14px; }
}

@media (max-width: 960px) {
  .header-inner { min-height: 66px; gap: 14px; }
  .header-path { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 70;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - 66px);
    overflow-y: auto;
    padding: 6px var(--pad-x) 22px;
    background: var(--sea-800);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(7, 26, 43, 0.6);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item { border-bottom: 1px dashed rgba(143, 163, 181, 0.28); }

  .nav-link {
    display: block;
    padding: 15px 4px;
    font-size: 16px;
    letter-spacing: 0.06em;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    color: var(--mint);
    box-shadow: inset 3px 0 0 var(--mint);
    padding-left: 12px;
  }

  .nav-cta {
    justify-content: center;
    margin-top: 18px;
    padding: 14px 18px;
    font-size: 15px;
  }

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

  .footer-exit {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .split,
  .split--reverse { grid-template-columns: minmax(0, 1fr); }

  .section-head { align-items: flex-start; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: 30px; }

  .footer-exit {
    box-shadow: 8px 8px 0 rgba(7, 26, 43, 0.5);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .footer-legal { gap: 8px 18px; }
}

@media (max-width: 520px) {
  .brand-node { width: 18px; height: 18px; }
  .brand-node::before { inset: 5px; }
  .brand-name { font-size: 19px; letter-spacing: 0.12em; }
  .nav-toggle { padding: 8px 11px; letter-spacing: 0.12em; }
  .media-frame { aspect-ratio: 4 / 3; }
}

/* ---------- 17. 减少动态 / 打印 ---------- */
@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;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .panel--lift:hover { transform: none; }
  .btn:hover::after,
  .nav-cta:hover::after,
  .exit-cta:hover::after { transform: none; }
}

@media print {
  .site-header,
  .site-footer::before,
  .read-route,
  .skip-link { display: none !important; }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  a { color: #000; text-decoration: underline; }
}