/* =========================================================
   逸贝娱乐会馆 · /assets/site.css
   夜航灯塔主题 · 共享外壳 / 通用组件 / 响应式基础
   ========================================================= */

:root {
  --ink: #0A1926;
  --ink-2: #102A3D;
  --ink-3: #16374F;
  --line: #1E4258;
  --line-soft: rgba(30, 66, 88, .5);
  --coral: #FF6B43;
  --coral-soft: #FF9A6C;
  --shell: #F5AFC0;
  --mint: #57E3B6;
  --gold: #FFD37A;
  --text: #E8F1F6;
  --muted: #9BB2C2;

  --shell-w: 1240px;
  --gutter: clamp(1.15rem, 4vw, 3rem);
  --block: clamp(2.75rem, 6vw, 5rem);

  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Helvetica Neue", "Arial Narrow", Arial, sans-serif;
  --font-body: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --step-1: .75rem;
  --step-2: .875rem;
  --step-3: 1.125rem;
  --step-4: 1.5rem;
  --step-5: 2.5rem;
  --step-6: 4.5rem;
}

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

html {
  background-color: var(--ink);
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  letter-spacing: .01em;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(920px 540px at 84% -8%, rgba(87, 227, 182, .10), transparent 62%),
    radial-gradient(780px 440px at 6% 2%, rgba(255, 107, 67, .12), transparent 66%),
    linear-gradient(180deg, #102A3D 0%, #0A1926 58%, #08131D 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(to right, rgba(30, 66, 88, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 66, 88, .22) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(120% 88% at 50% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(120% 88% at 50% 0%, #000 18%, transparent 76%);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -.015em;
  margin: 0 0 .6em;
}

p { margin: 0 0 1em; }

a { color: inherit; }

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

ul, ol { margin: 0; padding: 0; }

button { font: inherit; }

::selection { background: rgba(255, 107, 67, .34); color: #FFFFFF; }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------------- 布局容器 ---------------- */
.shell {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--block); }
.section + .section { border-top: 1px solid var(--line-soft); }

.prose { max-width: 44rem; }
.prose p { margin: 0 0 1.15em; }
.prose p:last-child { margin-bottom: 0; }
.prose h3 { font-size: var(--step-4); margin-top: 1.6em; }
.prose strong { color: #FFFFFF; font-weight: 600; }
.prose a {
  color: var(--shell);
  text-decoration: underline;
  text-decoration-color: rgba(245, 175, 192, .45);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--shell); }

/* ---------------- 跳过链接 ---------------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -120%;
  z-index: 999;
  padding: .65rem 1.1rem;
  background: var(--coral);
  color: #06131C;
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: .06em;
  text-decoration: none;
  border-radius: 2px;
  transition: top .18s ease;
}
.skip-link:focus { top: .6rem; }

/* =========================================================
   头部
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 25, 38, .93);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-utility {
  background: rgba(16, 42, 61, .72);
  border-bottom: 1px solid var(--line-soft);
  font-size: var(--step-1);
}

.header-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 40px;
  padding-top: .35rem;
  padding-bottom: .35rem;
}

.header-utility__brand {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .75rem;
  min-width: 0;
}

.header-utility__name {
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--text);
  white-space: nowrap;
}

.header-utility__sub {
  color: var(--muted);
  letter-spacing: .12em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.utility-nav { min-width: 0; }

.utility-nav__list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.utility-nav__link {
  display: inline-block;
  padding: .3rem 0;
  color: var(--muted);
  letter-spacing: .05em;
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.utility-nav__link:hover,
.utility-nav__link:focus-visible {
  color: var(--shell);
  border-bottom-color: rgba(245, 175, 192, .5);
}
.utility-nav__link[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: rgba(255, 211, 122, .55);
}

.header-main__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 74px;
  padding-top: .7rem;
  padding-bottom: .7rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .85rem;
  flex: 0 0 auto;
  color: var(--text);
  text-decoration: none;
}

.brand__beam {
  position: relative;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: linear-gradient(142deg, rgba(255, 107, 67, .92) 0%, rgba(245, 175, 192, .38) 54%, rgba(10, 25, 38, 0) 55%);
}
.brand__beam::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 211, 122, .55);
}
.brand:hover .brand__beam { border-color: var(--coral); }

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

.brand__mark {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.35rem;
  letter-spacing: .16em;
  color: var(--text);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .22em;
  color: var(--muted);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-left: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: .3rem;
  list-style: none;
}

.primary-nav__item { display: block; }

.primary-nav__link {
  display: inline-block;
  padding: .55rem .72rem;
  color: var(--text);
  font-size: .95rem;
  letter-spacing: .04em;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--coral-soft);
  border-bottom-color: var(--coral-soft);
}
.primary-nav__link[aria-current="page"] {
  color: var(--coral);
  border-bottom-color: var(--coral);
  background: linear-gradient(180deg, rgba(255, 107, 67, 0) 58%, rgba(255, 107, 67, .14) 100%);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .6rem;
  padding: .6rem .85rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: var(--step-2);
  letter-spacing: .14em;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--coral); color: var(--coral-soft); }

.nav-toggle__icon { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bar { display: block; height: 1px; background: currentColor; }
.nav-toggle[aria-expanded="true"] { border-color: var(--coral); color: var(--coral); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: .25; }

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, rgba(30, 66, 88, .8), rgba(30, 66, 88, 0));
  pointer-events: none;
}
.header-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--coral), var(--gold));
  transition: width .08s linear;
}

/* =========================================================
   按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .7rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-size: var(--step-2);
  letter-spacing: .08em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.btn--primary {
  background: var(--coral);
  border-color: var(--coral);
  color: #06131C;
  font-weight: 600;
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--coral-soft);
  border-color: var(--coral-soft);
}
.btn--ghost { border-color: var(--line); color: var(--text); }
.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--shell); color: var(--shell); }
.btn--gold { border-color: rgba(255, 211, 122, .6); color: var(--gold); }
.btn--gold:hover,
.btn--gold:focus-visible { background: rgba(255, 211, 122, .12); }

/* =========================================================
   章节 / 网格 / 卡片
   ========================================================= */
.section-head {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  margin-bottom: 1.9rem;
}

.section-index {
  margin: 0;
  padding-top: .85rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--coral);
  transition: color .25s ease;
}

.section-head__body { min-width: 0; }

.section-title {
  margin: 0;
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  letter-spacing: -.02em;
}

.section-lede {
  margin: .7rem 0 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: var(--step-3);
}

[data-section-id][data-active="true"] .section-index {
  color: var(--gold);
  text-shadow: 0 0 14px rgba(255, 211, 122, .45);
}

.grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.75rem);
}
.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, 1.15fr) minmax(0, .85fr); align-items: start; }
.grid--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: start; }

.card {
  position: relative;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: linear-gradient(162deg, rgba(16, 42, 61, .86), rgba(10, 25, 38, .72));
}
.card::after {
  content: "";
  position: absolute;
  left: -1px;
  bottom: -1px;
  width: 36px;
  height: 2px;
  background: var(--coral);
  opacity: .85;
}
.card--soft { background: rgba(16, 42, 61, .55); }
.card--emphasis {
  border-color: rgba(255, 107, 67, .5);
  background: linear-gradient(162deg, rgba(255, 107, 67, .12), rgba(10, 25, 38, .8) 62%);
}
.card--emphasis::after { background: var(--gold); width: 64px; }

.card__index {
  display: block;
  margin-bottom: .85rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--shell);
}

.card__title {
  margin: 0 0 .55rem;
  font-size: var(--step-4);
  letter-spacing: -.01em;
}

.card__body { margin: 0; color: var(--muted); font-size: var(--step-3); }
.card__body + .card__body { margin-top: .7rem; }

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  margin-top: 1.1rem;
  padding-top: .9rem;
  border-top: 1px solid var(--line-soft);
  font-size: var(--step-2);
  color: var(--muted);
}

/* =========================================================
   标签 / 状态 / 文字锚点
   ========================================================= */
.tag {
  display: inline-flex;
  align-items: center;
  padding: .18rem .6rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--muted);
  white-space: nowrap;
}
.tag--shell { border-color: rgba(245, 175, 192, .5); color: var(--shell); background: rgba(245, 175, 192, .09); }
.tag--gold { border-color: rgba(255, 211, 122, .5); color: var(--gold); background: rgba(255, 211, 122, .09); }
.tag--mint { border-color: rgba(87, 227, 182, .45); color: var(--mint); background: rgba(87, 227, 182, .09); }

.status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: var(--step-2);
  color: var(--muted);
}
.status__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(87, 227, 182, .14);
}
.status--pending .status__dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 211, 122, .14);
}

.mono-note {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--muted);
}

.anchor-num {
  font-family: var(--font-mono);
  font-size: var(--step-3);
  letter-spacing: .12em;
  color: var(--gold);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding-bottom: 2px;
  color: var(--coral);
  font-size: .92rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 67, .35);
  transition: color .2s ease, border-color .2s ease;
}
.link-arrow::after { content: "→"; transition: transform .2s ease; }
.link-arrow:hover,
.link-arrow:focus-visible { color: var(--coral-soft); border-bottom-color: var(--coral-soft); }
.link-arrow:hover::after { transform: translateX(4px); }

/* =========================================================
   面包屑 / 装饰
   ========================================================= */
.breadcrumb { padding-top: 1.5rem; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--muted);
}

.breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible { color: var(--shell); border-bottom-color: rgba(245, 175, 192, .5); }

.breadcrumb__sep { color: var(--line); }
.breadcrumb__current { color: var(--gold); }

.arc-rule {
  height: 1px;
  border: 0;
  margin: 2.5rem 0;
  opacity: .65;
  background: linear-gradient(90deg, transparent 0%, var(--line) 16%, var(--shell) 50%, var(--line) 84%, transparent 100%);
}

.beam {
  position: absolute;
  pointer-events: none;
  opacity: .7;
  background: linear-gradient(100deg,
    rgba(255, 107, 67, 0) 0%,
    rgba(255, 107, 67, .30) 34%,
    rgba(245, 175, 192, .22) 54%,
    rgba(245, 175, 192, 0) 82%);
}

/* =========================================================
   媒体容器（供页面阶段放置图片占位）
   ========================================================= */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  isolation: isolate;
  background:
    radial-gradient(120% 92% at 20% 10%, rgba(255, 107, 67, .18), transparent 58%),
    radial-gradient(90% 70% at 88% 96%, rgba(87, 227, 182, .12), transparent 62%),
    linear-gradient(155deg, var(--ink-2), var(--ink) 74%);
}
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--arc {
  -webkit-clip-path: ellipse(118% 100% at 50% 0%);
  clip-path: ellipse(118% 100% at 50% 0%);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: repeating-linear-gradient(115deg, rgba(232, 241, 246, .05) 0 1px, transparent 1px 9px);
}
.media-frame::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -16%;
  width: 120%;
  height: 44%;
  z-index: 0;
  border-radius: 50%;
  border-top: 1px solid rgba(245, 175, 192, .38);
  box-shadow: 0 -14px 0 -13px rgba(87, 227, 182, .26);
  pointer-events: none;
}
.media-frame > img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__caption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 2;
  margin: 0;
  padding: .3rem .65rem;
  background: rgba(10, 25, 38, .78);
  border-left: 2px solid var(--shell);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--text);
}

/* =========================================================
   显现 / 返回顶部
   ========================================================= */
[data-reveal] {
  transition: opacity .6s cubic-bezier(.2, .7, .3, 1), transform .6s cubic-bezier(.2, .7, .3, 1);
}
html[data-enhance="true"] [data-reveal]:not([data-revealed="true"]) {
  opacity: 0;
  transform: translateY(18px);
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 70;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 0;
  background: rgba(16, 42, 61, .94);
  color: var(--shell);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, border-color .25s ease, color .25s ease;
}
.to-top[data-visible="true"] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.to-top:hover,
.to-top:focus-visible { border-color: var(--coral); color: var(--coral); }

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  background: linear-gradient(180deg, rgba(16, 42, 61, .55), rgba(8, 19, 29, 1));
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 6%;
  width: 26%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--shell), transparent);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(210px, 1.2fr) repeat(3, minmax(120px, .8fr));
  gap: 2.5rem;
  padding-top: clamp(2.5rem, 5vw, 3.75rem);
  padding-bottom: 2rem;
}

.footer-brand__mark {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 300;
  letter-spacing: .18em;
  color: var(--text);
}
.footer-brand__line {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--muted);
}
.footer-brand__note {
  margin: 0;
  max-width: 17rem;
  font-size: var(--step-2);
  color: var(--muted);
}

.footer-column__title {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 400;
  letter-spacing: .2em;
  color: var(--shell);
}

.footer-column__list { list-style: none; }

.footer-column__link {
  display: inline-block;
  padding: .28rem 0;
  color: var(--muted);
  font-size: var(--step-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.footer-column__link:hover,
.footer-column__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--coral);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem 2rem;
  padding-top: 1.75rem;
  padding-bottom: 1.75rem;
  border-top: 1px solid var(--line-soft);
}

.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  min-width: 0;
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--shell);
}
.footer-contact__value {
  font-size: var(--step-2);
  color: var(--text);
  word-break: break-word;
}

.footer-base {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .6rem 2rem;
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid var(--line-soft);
  font-size: .78rem;
  color: var(--muted);
}
.footer-base__item { margin: 0; }
.footer-base__item--copy { color: var(--muted); }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .header-utility__sub { display: none; }
  .primary-nav { gap: 1rem; }
  .primary-nav__link { padding: .55rem .55rem; font-size: .9rem; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .header-main__inner { min-height: 66px; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding-inline: var(--gutter);
    background: rgba(8, 19, 29, .98);
    border-bottom: 1px solid var(--line);
    border-top: 1px solid var(--line-soft);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height .32s ease, padding .32s ease, visibility .32s;
  }
  .primary-nav[data-open="true"] {
    max-height: 78vh;
    overflow-y: auto;
    visibility: visible;
    padding-top: 1rem;
    padding-bottom: 1.5rem;
  }

  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 0; }

  .primary-nav__link {
    display: block;
    padding: .85rem .75rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--line-soft);
    border-left: 2px solid transparent;
  }
  .primary-nav__link[aria-current="page"] {
    background: rgba(255, 107, 67, .09);
    border-bottom-color: var(--line-soft);
    border-left-color: var(--coral);
  }

  .primary-nav__cta { width: 100%; margin-top: 1.1rem; }

  .grid--2,
  .grid--3,
  .grid--split,
  .grid--7-5 { grid-template-columns: minmax(0, 1fr); }

  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-base { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  body { font-size: 16px; }

  .header-utility__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
    padding-top: .55rem;
    padding-bottom: .55rem;
  }
  .utility-nav {
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .utility-nav::-webkit-scrollbar { display: none; }
  .utility-nav__list { gap: 1.15rem; }
  .utility-nav__link { font-size: .76rem; }

  .brand__mark { font-size: 1.15rem; letter-spacing: .12em; }
  .brand__sub { font-size: .58rem; letter-spacing: .18em; }

  .section-head { grid-template-columns: 2.6rem minmax(0, 1fr); gap: .7rem; }
  .section-index { padding-top: .55rem; }

  .footer-top { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-base { grid-template-columns: minmax(0, 1fr); }

  .to-top { width: 42px; height: 42px; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  [data-reveal],
  html[data-enhance="true"] [data-reveal]:not([data-revealed="true"]) {
    opacity: 1 !important;
    transform: none !important;
  }

  .to-top { transition: none; }
  .header-progress__bar { transition: none; }
}