/* ==========================================================================
   必博主页 · 共享站点套件  /assets/site.css
   深海蓝册页 / 纸白阅读区 / 珊瑚橙行动 / 暖沙金标记
   ========================================================================== */

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

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

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

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

a { color: inherit; text-decoration: none; }

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

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

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 3px solid #FF6B4A;
  outline-offset: 3px;
  border-radius: 2px;
}

/* 2. 变量 ---------------------------------------------------------------- */
:root {
  --ink-deep: #0B2A4A;
  --ink: #061A30;
  --tide: #1E4A6E;
  --mist: #A9C3D6;
  --paper: #F7F1E6;
  --coral: #FF6B4A;
  --gold: #E8C47C;
  --palm: #2F5D50;
  --sand: #D8CBB8;
  --char: #10202E;

  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-num: "Futura", "Avenir Next", "Helvetica Neue", Arial, sans-serif;

  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 40px);

  --head-band-h: 34px;
  --head-bar-h: 78px;
  --head-rule: 3px;
  --head-total: calc(var(--head-band-h) + var(--head-bar-h) + var(--head-rule));

  --line: rgba(216, 203, 184, 0.55);
  --line-dark: rgba(169, 195, 214, 0.22);
  --shadow-hard: 6px 6px 0 rgba(11, 42, 74, 0.16);
  --shadow-dark: 6px 6px 0 rgba(6, 26, 48, 0.5);
}

/* 3. 基础排版 ------------------------------------------------------------ */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  color: var(--char);
  background-color: var(--paper);
  background-image:
    radial-gradient(rgba(11, 42, 74, 0.05) 1px, transparent 1.4px);
  background-size: 7px 7px;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--ink-deep);
}

p { line-height: 1.82; }

.on-dark,
.on-dark h1,
.on-dark h2,
.on-dark h3 { color: var(--paper); }

.on-dark p { color: rgba(169, 195, 214, 0.92); }

/* 4. 通用容器与工具类 ---------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(42px, 6vw, 82px); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--ink-deep);
}

.section-title--light { color: var(--paper); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: currentColor;
}

.tag {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--tide);
}

.tag--gold { color: var(--gold); }

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

/* 5. 跳转链接 ------------------------------------------------------------ */
.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 300;
  padding: 12px 20px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--gold);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(6, 26, 48, 0.4);
  transition: top 0.22s ease;
}

.skip-link:focus { top: 14px; }

/* 6. 头部 ---------------------------------------------------------------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 90;
  color: var(--paper);
  background-color: transparent;
  background-image: linear-gradient(180deg, rgba(6, 26, 48, 0.6) 0%, rgba(6, 26, 48, 0) 100%);
  transition: background-color 0.35s ease, box-shadow 0.35s ease;
}

.site-head[data-solid="true"] {
  background-color: var(--ink-deep);
  background-image: none;
  box-shadow: 0 20px 34px -26px rgba(6, 26, 48, 0.95);
}

/* 6.1 快速对照带 */
.head-band {
  background: var(--ink);
  color: var(--mist);
  border-bottom: 1px solid rgba(169, 195, 214, 0.16);
}

.band-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: var(--head-band-h);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.band-label {
  color: var(--gold);
  font-weight: 600;
  white-space: nowrap;
}

.band-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 24px);
  overflow-x: auto;
  scrollbar-width: none;
}

.band-list::-webkit-scrollbar { display: none; }

.band-link {
  position: relative;
  display: inline-block;
  padding-block: 3px;
  white-space: nowrap;
  color: var(--mist);
  transition: color 0.22s ease;
}

.band-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s ease;
}

.band-link:hover,
.band-link:focus-visible { color: var(--gold); }

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

.band-meta {
  margin-left: auto;
  white-space: nowrap;
  color: rgba(169, 195, 214, 0.6);
}

/* 6.2 主导航条 */
.head-bar { position: relative; }

.bar-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  min-height: var(--head-bar-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--coral);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--gold);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.brand:hover .brand-mark {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--gold);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.brand-tag {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.5vw, 20px);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 11px;
  font-size: 15px;
  letter-spacing: 0.05em;
  color: rgba(247, 241, 230, 0.88);
  border-radius: 2px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--gold);
  background: rgba(169, 195, 214, 0.1);
}

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

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  background: var(--coral);
}

.nav-hint {
  position: absolute;
  left: 50%;
  top: calc(100% + 8px);
  z-index: 5;
  transform: translate(-50%, -6px);
  white-space: nowrap;
  padding: 6px 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--gold);
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 rgba(6, 26, 48, 0.5);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.nav-link:hover .nav-hint,
.nav-link:focus-visible .nav-hint {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.head-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--ink);
  background: var(--coral);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(232, 196, 124, 0.85);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.head-cta:hover {
  background: #FF8163;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(232, 196, 124, 0.85);
}

.head-cta:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(232, 196, 124, 0.85);
}

/* 6.3 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 46px;
  height: 42px;
  margin-left: auto;
  border: 2px solid var(--mist);
  background: rgba(6, 26, 48, 0.35);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--gold);
  background: rgba(6, 26, 48, 0.6);
}

.toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--paper);
  transition: transform 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* 6.4 阅读进度条 */
.scroll-progress {
  height: var(--head-rule);
  background: rgba(169, 195, 214, 0.16);
  overflow: hidden;
}

.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--coral));
  transition: width 0.12s linear;
}

body.is-nav-open { overflow: hidden; }

/* 7. 按钮 ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-deep);
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(6, 26, 48, 0.9);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(6, 26, 48, 0.9);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(6, 26, 48, 0.9);
}

.btn--primary {
  background: var(--coral);
  color: #FFFFFF;
}

.btn--primary:hover { background: #FF8163; }

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

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--mist);
  box-shadow: 4px 4px 0 rgba(169, 195, 214, 0.28);
}

.btn--ghost:hover {
  background: rgba(169, 195, 214, 0.12);
  box-shadow: 6px 6px 0 rgba(169, 195, 214, 0.34);
}

/* 8. 面包屑 -------------------------------------------------------------- */
.crumbs {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--tide);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}

.crumbs li { display: inline-flex; align-items: center; }

.crumbs li + li::before {
  content: "›";
  margin-inline: 9px;
  color: var(--sand);
}

.crumbs a {
  color: var(--tide);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.crumbs a:hover {
  color: var(--coral);
  border-bottom-color: currentColor;
}

.crumbs [aria-current="page"] { color: var(--ink-deep); }

/* 9. 正文容器 ------------------------------------------------------------ */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--char);
}

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

.prose h2 {
  margin-top: 2em;
  font-size: clamp(28px, 3.4vw, 36px);
  color: var(--ink-deep);
}

.prose h3 {
  margin-top: 1.7em;
  font-size: clamp(22px, 2.4vw, 25px);
  color: var(--ink-deep);
}

.prose ul,
.prose ol { padding-left: 0; }

.prose ul li,
.prose ol li {
  position: relative;
  padding-left: 22px;
  margin-top: 0.55em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--coral);
}

.prose ol { counter-reset: prose-ol; }

.prose ol li::before {
  counter-increment: prose-ol;
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15em;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--coral);
}

.prose a {
  color: var(--ink-deep);
  border-bottom: 2px solid var(--gold);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.prose a:hover {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.prose blockquote {
  margin-inline: 0;
  padding: 6px 0 6px 22px;
  border-left: 3px solid var(--coral);
  color: var(--tide);
  font-family: var(--font-display);
  font-size: 20px;
}

/* 10. 网格与卡片 --------------------------------------------------------- */
.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--split { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.65fr); }

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--paper);
  border: 2px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 rgba(11, 42, 74, 0.2);
}

.card--dark {
  background: var(--ink-deep);
  color: var(--paper);
  border-color: var(--tide);
  box-shadow: var(--shadow-dark);
}

.card--dark h2,
.card--dark h3 { color: var(--paper); }

.card--accent { border-color: var(--coral); }

/* 11. 图片容器基础规则 --------------------------------------------------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(30, 74, 110, 0.96), rgba(11, 42, 74, 0.98));
  border: 2px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
}

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

.media--wide { aspect-ratio: 21 / 9; }

.media--16x10 { aspect-ratio: 16 / 10; }

.media--square { aspect-ratio: 1 / 1; }

.media--tall { aspect-ratio: 3 / 4; }

.media--halftone::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(11, 42, 74, 0.55) 1px, transparent 1.5px);
  background-size: 6px 6px;
  opacity: 0.34;
  mix-blend-mode: multiply;
}

.media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--tide);
}

/* 12. 页脚 -------------------------------------------------------------- */
.site-foot {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 9vw, 120px);
  padding-top: clamp(48px, 6vw, 88px);
  background: var(--ink);
  color: var(--mist);
  border-top: 3px solid var(--gold);
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(169, 195, 214, 0.06) 0 1px, transparent 1px 74px),
    radial-gradient(120% 90% at 88% -10%, rgba(255, 107, 74, 0.16), transparent 62%);
}

.site-foot > * { position: relative; }

.foot-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 0.72fr));
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(38px, 5vw, 64px);
}

.foot-lead { min-width: 0; }

.foot-brand { display: inline-block; }

.foot-brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.foot-brand-sub {
  display: block;
  margin-top: 9px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.foot-tagline {
  margin-top: 18px;
  max-width: 24ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(169, 195, 214, 0.9);
}

.foot-contact {
  margin-top: 16px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  word-break: break-all;
}

.foot-sep {
  margin-inline: 10px;
  color: rgba(169, 195, 214, 0.45);
}

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

.foot-col-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.foot-col-num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

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

.foot-links a {
  display: inline-block;
  padding: 7px 0;
  font-size: 15px;
  color: rgba(169, 195, 214, 0.92);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.foot-links a:hover,
.foot-links a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--coral);
  transform: translateX(3px);
}

.foot-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-block: 22px 30px;
  border-top: 1px dashed rgba(169, 195, 214, 0.24);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(169, 195, 214, 0.72);
}

.foot-legal { color: var(--gold); }

.foot-note:last-child { margin-left: auto; }

.return-buoy {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--paper);
  background: var(--ink-deep);
  border: 2px solid var(--gold);
  box-shadow: 5px 5px 0 rgba(6, 26, 48, 0.45);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.return-buoy:hover,
.return-buoy:focus-visible {
  background: var(--coral);
  border-color: var(--coral);
  color: #FFFFFF;
  transform: translateY(-3px);
  box-shadow: 7px 8px 0 rgba(6, 26, 48, 0.45);
}

.buoy-arrow {
  font-family: var(--font-num);
  font-size: 15px;
  line-height: 1;
}

.buoy-text { line-height: 1; }

/* 13. 滚动渐显 ----------------------------------------------------------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 14. 响应式 ------------------------------------------------------------- */
@media (max-width: 1080px) {
  .brand-tag { display: none; }
  .nav-link { font-size: 14px; padding: 9px 8px; }
  .nav-link[aria-current="page"]::after { left: 8px; right: 8px; }
}

@media (max-width: 960px) {
  :root { --head-bar-h: 66px; }

  .head-band { font-size: 10px; }

  .band-meta { display: none; }

  .brand-tag { display: block; }

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

  .brand-mark { width: 40px; height: 40px; font-size: 19px; }

  .site-nav {
    position: fixed;
    top: var(--head-total);
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    max-height: calc(100vh - var(--head-total));
    overflow-y: auto;
    padding: 10px var(--gutter) 28px;
    background: var(--ink-deep);
    border-top: 1px solid var(--line-dark);
    border-bottom: 3px solid var(--gold);
    box-shadow: 0 30px 50px -22px rgba(6, 26, 48, 0.92);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  }

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

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

  .nav-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 4px;
    font-size: 17px;
    color: var(--paper);
    border-bottom: 1px solid var(--line-dark);
    border-radius: 0;
    background: none;
  }

  .nav-link::before {
    counter-increment: navi;
    content: counter(navi, decimal-leading-zero);
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--gold);
  }

  .nav-link[aria-current="page"]::after { display: none; }

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

  .nav-hint { display: none; }

  .head-cta {
    margin-top: 22px;
    align-self: flex-start;
    padding: 13px 24px;
  }

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

  .foot-lead { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .grid--2,
  .grid--3,
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 600px) {
  body { font-size: 16px; }

  .band-inner { gap: 14px; }

  .band-label { display: none; }

  .head-band { font-size: 10px; letter-spacing: 0.1em; }

  .brand-name { font-size: 17px; }

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

  .foot-note:last-child { margin-left: 0; }

  .return-buoy { padding: 10px 14px; font-size: 13px; }
}

@media (max-width: 400px) {
  .brand-text { display: none; }
}

/* 15. 动效偏好 ----------------------------------------------------------- */
@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;
  }

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

  .return-buoy:hover,
  .return-buoy:focus-visible,
  .card:hover,
  .btn:hover,
  .head-cta:hover,
  .brand:hover .brand-mark { transform: none !important; }
}