/* ============================================================
   半岛赛场 · 共享样式 /assets/site.css
   深蓝潮汐网格 + 切角面板 + 轨道式索引
   ============================================================ */

:root {
  --ink: #061826;
  --pine: #0B3B34;
  --panel: #102C44;
  --paper: #F4F6EE;
  --signal: #FF6A2A;
  --cyan: #2BF0D0;
  --mist: #A9B9C8;
  --line: #244A5E;
  --void: #020B12;
  --violet: #7C5CFF;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: var(--font-display);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 1240px;
  --rail: 264px;
  --cut: 14px;
  --header-h: 68px;
  --track-h: 56px;
  --ease: 200ms cubic-bezier(.2,.7,.3,1);
}

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

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

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

ul, ol { list-style: none; }

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

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

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--paper); }

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

/* ---------- base ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(36, 74, 94, .26) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(36, 74, 94, .16) 0 1px, transparent 1px 96px);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--signal); color: var(--void); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.06;
  color: var(--paper);
}

h1 { font-size: clamp(2.2rem, 4.4vw, 3.8rem); }
h2 { font-size: clamp(1.55rem, 2.6vw, 2.25rem); line-height: 1.14; }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.4rem); line-height: 1.28; letter-spacing: -.015em; }
h4 { font-size: 1.02rem; line-height: 1.35; letter-spacing: -.01em; }

strong { color: var(--paper); font-weight: 700; }

#main-content { display: block; }

/* ---------- layout ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.section { padding-block: clamp(40px, 6vw, 80px); }

.section__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 600 11.5px/1 var(--font-mono);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--paper);
}
.display--xl { font-size: clamp(2.6rem, 7vw, 5.6rem); line-height: .98; }

.section-num {
  display: inline-block;
  font: 700 clamp(2.4rem, 5vw, 4.2rem)/1 var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
  color: rgba(43, 240, 208, .55);
}
@supports (-webkit-text-stroke: 1px #000) {
  .section-num {
    color: transparent;
    -webkit-text-stroke: 1px var(--cyan);
  }
}

.lead {
  font: 400 clamp(1rem, 1.3vw, 1.15rem)/1.8 var(--font-body);
  color: rgba(244, 246, 238, .86);
  max-width: 62ch;
}

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 44px);
  background: repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 16px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 侧边索引轨道 ---------- */
.rail-layout {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.rail {
  position: sticky;
  top: calc(var(--header-h) + var(--track-h) + 16px);
  background-color: var(--pine);
  border: 1px solid rgba(36, 74, 94, .9);
  padding: 18px 16px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.rail__title {
  font: 700 11.5px/1 var(--font-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 14px;
}

.rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail__link {
  display: block;
  padding: 9px 10px 9px 14px;
  font: 500 14px/1.4 var(--font-body);
  color: rgba(244, 246, 238, .78);
  border-left: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}
.rail__link:hover {
  color: var(--paper);
  background-color: rgba(6, 24, 38, .5);
  border-left-color: var(--cyan);
}
.rail__link[aria-current="true"] {
  color: var(--paper);
  background-color: rgba(255, 106, 42, .14);
  border-left-color: var(--signal);
}

@media (max-width: 1024px) {
  .rail-layout { grid-template-columns: minmax(0, 1fr); }
  .rail { position: static; }
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  transform: translateY(-180%);
  background-color: var(--signal);
  color: var(--void);
  font: 700 14px/1 var(--font-body);
  padding: 12px 18px;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform var(--ease);
}
.skip-link:focus-visible {
  transform: translateY(0);
  outline: none;
  box-shadow: inset 0 0 0 2px var(--void);
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}
.site-header.is-scrolled,
.site-header.nav-open {
  background-color: rgba(6, 24, 38, .97);
  border-bottom-color: var(--line);
  box-shadow: 0 24px 48px -36px #000;
}

.header-bar {
  position: relative;
  z-index: 2;
}

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: var(--header-h);
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}
.brand:hover { color: var(--paper); }

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background-color: var(--signal);
  color: var(--void);
  font: 800 18px/1 var(--font-display);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color var(--ease), color var(--ease);
}
.brand:hover .brand__mark {
  background-color: var(--cyan);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand__name {
  font: 800 17px/1.1 var(--font-display);
  letter-spacing: .02em;
}

.brand__sub {
  font: 500 9px/1 var(--font-mono);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}

/* nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  font: 500 15px/1.2 var(--font-body);
  color: rgba(244, 246, 238, .76);
  text-decoration: none;
  transition: color var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms ease, background-color var(--ease);
}
.site-nav__link:hover { color: var(--paper); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--paper); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--signal);
}

.site-nav__foot { display: none; }

/* header actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  font: 700 14px/1 var(--font-body);
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--line);
  background-color: transparent;
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}
.btn:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.btn--ghost {
  background-color: rgba(16, 44, 68, .6);
  border-color: var(--line);
  color: var(--paper);
}
.btn--ghost:hover {
  background-color: var(--panel);
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn--signal {
  background-color: var(--signal);
  border-color: var(--signal);
  color: var(--void);
}
.btn--signal:hover {
  background-color: #ff824f;
  border-color: #ff824f;
  color: var(--void);
}
.btn--line {
  background-color: transparent;
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn--line:hover {
  background-color: rgba(43, 240, 208, .12);
  color: var(--paper);
}
.btn--block { width: 100%; }

/* nav toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  background-color: rgba(16, 44, 68, .65);
  color: var(--paper);
  font: 600 13px/1 var(--font-body);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: border-color var(--ease), color var(--ease), background-color var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle__text { letter-spacing: .1em; }

/* ---------- 三步路径条 ---------- */
.track-bar {
  border-top: 1px solid rgba(36, 74, 94, .7);
  border-bottom: 1px solid var(--line);
  background-color: rgba(2, 11, 18, .86);
}

.track-bar__list {
  display: flex;
  align-items: stretch;
  min-height: var(--track-h);
}

.track-bar__item {
  position: relative;
  display: flex;
  flex: 1 1 0;
  min-width: 0;
}
.track-bar__item + .track-bar__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 22px;
  background: var(--line);
  transform: translateY(-50%) skewX(-18deg);
}

.track-bar__link {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 14px;
  color: rgba(244, 246, 238, .72);
  transition: color var(--ease), background-color var(--ease);
}
.track-bar__link:hover {
  color: var(--paper);
  background-color: rgba(16, 44, 68, .55);
}
.track-bar__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.track-bar__num {
  font: 600 12px/1 var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
  color: var(--cyan);
}

.track-bar__label {
  font: 800 15px/1 var(--font-display);
  letter-spacing: .06em;
  color: inherit;
}

.track-bar__hint {
  font: 500 11px/1 var(--font-mono);
  letter-spacing: .12em;
  color: var(--mist);
}

.track-bar__link[aria-current="step"] {
  background-color: var(--signal);
  color: var(--void);
}
.track-bar__link[aria-current="step"] .track-bar__num,
.track-bar__link[aria-current="step"] .track-bar__hint {
  color: rgba(2, 11, 18, .74);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), var(--cyan));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
  pointer-events: none;
}

/* ---------- 通用面板与卡片 ---------- */
.panel {
  position: relative;
  background-color: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.4vw, 28px);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background-color: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 26px);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: border-color var(--ease), background-color var(--ease);
}
.card:hover {
  border-color: var(--cyan);
  background-color: #13324c;
}

.card__label {
  font: 600 11px/1 var(--font-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.card__title {
  font: 800 18px/1.3 var(--font-display);
  letter-spacing: -.01em;
  color: var(--paper);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font: 600 11px/1.6 var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  background-color: rgba(36, 74, 94, .4);
  color: var(--mist);
}
.tag--signal {
  background-color: var(--signal);
  border-color: var(--signal);
  color: var(--void);
}
.tag--cyan {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--void);
}
.tag--violet {
  background-color: rgba(124, 92, 255, .22);
  border-color: var(--violet);
  color: var(--paper);
}

/* 指标 */
.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.metric__num {
  font: 700 clamp(1.6rem, 3vw, 2.4rem)/1 var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--cyan);
}
.metric__label {
  font: 500 12.5px/1.5 var(--font-body);
  color: var(--mist);
}

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-block: 14px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font: 500 12px/1.6 var(--font-mono);
  letter-spacing: .06em;
  color: var(--mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}

.breadcrumb__a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.breadcrumb__a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

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

/* ---------- 正文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--mist);
}
.prose p + p { margin-top: 1em; }
.prose h2,
.prose h3 {
  color: var(--paper);
  margin-top: 1.8em;
  margin-bottom: .6em;
}
.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: .5em;
  margin: 1em 0;
}
.prose li {
  position: relative;
  padding-left: 20px;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 1px;
  background: var(--signal);
}
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(43, 240, 208, .4);
}
.prose a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 图片容器 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--panel);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  background-color: var(--pine);
}

.figure--wide .figure__img { aspect-ratio: 21 / 9; }
.figure--tall .figure__img { aspect-ratio: 4 / 5; }

.figure__caption {
  margin-top: 10px;
  font: 500 12px/1.6 var(--font-mono);
  letter-spacing: .04em;
  color: var(--mist);
}

@media (max-width: 640px) {
  .figure__img,
  .figure--wide .figure__img { aspect-ratio: 16 / 10; }
}

/* ---------- footer ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 110px);
  background-color: var(--void);
  background-image: repeating-linear-gradient(90deg, rgba(36, 74, 94, .35) 0 1px, transparent 1px 80px);
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr .9fr 1.5fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(36px, 6vw, 72px);
}

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

.footer-brand__name {
  font: 800 22px/1.1 var(--font-display);
  letter-spacing: .02em;
  color: var(--paper);
}

.footer-brand__line {
  margin-top: 12px;
  max-width: 34ch;
  font: 400 15px/1.7 var(--font-body);
  color: var(--mist);
}

.footer-note {
  margin-top: 16px;
  padding: 10px 12px;
  border-left: 2px solid var(--signal);
  background-color: rgba(16, 44, 68, .55);
  font: 500 12.5px/1.6 var(--font-body);
  color: rgba(169, 185, 200, .92);
}

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

.footer-col__title {
  margin-bottom: 16px;
  font: 700 11.5px/1 var(--font-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list__a {
  display: inline-block;
  font: 500 14.5px/1.5 var(--font-body);
  color: rgba(244, 246, 238, .78);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.footer-list__a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer-col--contact {
  border-left: 1px solid rgba(36, 74, 94, .7);
  padding-left: clamp(16px, 2vw, 24px);
}

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

.footer-contact__row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.footer-contact__label {
  font: 600 11px/1.5 var(--font-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}

.footer-contact__value {
  font: 400 13.5px/1.65 var(--font-body);
  color: rgba(244, 246, 238, .86);
  word-break: break-word;
}

.footer-contact__value--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.footer-bottom {
  border-top: 1px solid rgba(36, 74, 94, .8);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 18px;
  font: 500 12.5px/1.6 var(--font-mono);
  letter-spacing: .02em;
  color: rgba(169, 185, 200, .85);
}

.footer-icp { color: rgba(169, 185, 200, .85); }

/* ---------- 响应式：平板与手机 ---------- */
@media (max-width: 1024px) {
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 14px clamp(16px, 4vw, 40px) 22px;
    background-color: rgba(6, 24, 38, .99);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 60px -40px #000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__item { border-bottom: 1px solid rgba(36, 74, 94, .6); }
  .site-nav__link {
    display: block;
    padding: 14px 4px;
    font-size: 17px;
    font-weight: 600;
    color: var(--paper);
  }
  .site-nav__link::after {
    left: 4px;
    right: auto;
    width: 28px;
    bottom: 8px;
  }

  .site-nav__foot {
    display: block;
    padding-top: 16px;
  }

  .nav-toggle { display: inline-flex; }
  .header-actions { margin-left: auto; }
  .header-actions__index { display: none; }

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

@media (max-width: 820px) {
  .track-bar__hint { display: none; }
  .track-bar__link { padding: 8px 10px; gap: 8px; }
  .track-bar__label { font-size: 14px; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-col--contact {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid rgba(36, 74, 94, .7);
    padding-top: 20px;
  }
  .footer-bottom__inner { font-size: 11.5px; }
}

@media (max-width: 520px) {
  .track-bar__num { display: none; }
  .brand__sub { display: none; }
  .nav-toggle__text { display: none; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}