/* ============================================================
   77棋牌电玩 · /assets/site.css
   共享外壳：reset / 设计令牌 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

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

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* ---------- 设计令牌 ---------- */
:root {
  --ink: #0B1020;
  --ink-2: #131A2E;
  --felt: #1B2540;
  --red: #FF3B5C;
  --amber: #FFB347;
  --teal: #2FD9B3;
  --white: #E8ECF5;
  --steel: #9AA6BF;
  --line: #26314F;
  --warn: #FF6B4A;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
    "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC",
    "Heiti SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, "Courier New", monospace;

  --gap: 24px;
  --radius: 14px;
  --radius-sm: 10px;
  --header-h: 72px;

  --shadow-soft: 0 18px 40px -30px rgba(0, 0, 0, 0.9);
  --glow-red: 0 0 22px -6px rgba(255, 59, 92, 0.75);
  --glow-amber: 0 0 22px -6px rgba(255, 179, 71, 0.6);
}

/* ---------- 基底与色彩节奏 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink);
  background-image:
    radial-gradient(940px 620px at 88% -12%, rgba(255, 59, 92, 0.14), transparent 62%),
    radial-gradient(760px 560px at 4% 6%, rgba(255, 179, 71, 0.09), transparent 64%),
    radial-gradient(680px 520px at 50% 108%, rgba(47, 217, 179, 0.07), transparent 66%);
  background-repeat: no-repeat;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
}

#main-content {
  display: block;
  outline: none;
}

/* ---------- 中文排版 ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(38px, 6.4vw, 68px); font-weight: 900; letter-spacing: 0.03em; }
h2 { font-size: clamp(24px, 3.4vw, 36px); }
h3 { font-size: clamp(19px, 2vw, 24px); font-weight: 700; }
h4 { font-size: 18px; font-weight: 700; }

p { max-width: 42em; }
p + p { margin-top: 0.9em; }

a {
  color: var(--amber);
  text-decoration-color: rgba(255, 179, 71, 0.4);
  text-underline-offset: 3px;
}

a:hover { color: #FFD79A; }

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

.mono, .num, time, code, kbd {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* ---------- 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: -9999px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--amber);
  color: #1A1206;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  left: 16px;
}

/* ---------- 布局容器 ---------- */
.wrap {
  width: min(1200px, 100% - 40px);
  margin-inline: auto;
}

.wrap--narrow {
  width: min(820px, 100% - 40px);
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: var(--gap);
}

.col-3, .col-4, .col-5, .col-6,
.col-7, .col-8, .col-9, .col-12 {
  grid-column: 1 / -1;
}

@media (min-width: 760px) {
  .grid { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-9 { grid-column: span 9; }
  .col-12 { grid-column: span 12; }
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin: 0;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 16, 32, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: min(1200px, 100% - 40px);
  min-height: var(--header-h);
  margin-inline: auto;
}

.site-header__gap {
  flex: 1 1 40px;
  min-width: 16px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 179, 71, 0.35), rgba(38, 49, 79, 0));
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(150deg, var(--felt), #0E1526);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  overflow: hidden;
}

.brand__mark::after {
  content: "";
  position: absolute;
  top: 7px;
  right: -6px;
  width: 20px;
  height: 2px;
  background: var(--red);
  transform: rotate(-45deg);
  box-shadow: var(--glow-red);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--white);
}

.brand__meta {
  display: block;
  margin-top: 1px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  color: var(--steel);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, letter-spacing 0.18s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1px;
  height: 2px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.site-nav__link:hover { color: var(--white); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--white);
  letter-spacing: 0.16em;
  font-weight: 600;
}

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--red);
  box-shadow: var(--glow-red);
}

.site-nav__utility {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.ver-chip {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid rgba(47, 217, 179, 0.35);
  border-radius: 999px;
  background: rgba(47, 217, 179, 0.08);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* 移动端汉堡 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(27, 37, 64, 0.6);
  color: var(--white);
  font-size: 14px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--red), var(--amber));
  box-shadow: 0 0 14px -2px rgba(255, 59, 92, 0.8);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  padding: 64px 0 40px;
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.site-footer__edge {
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--red) 16%, var(--amber) 58%, transparent);
}

.site-footer__glow {
  position: absolute;
  right: -12%;
  bottom: -55%;
  width: 62%;
  height: 320px;
  background: radial-gradient(closest-side, rgba(255, 59, 92, 0.16), transparent 72%);
  pointer-events: none;
}

.site-footer .wrap { position: relative; z-index: 1; }

.site-footer__top {
  display: grid;
  gap: 34px;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .site-footer__top { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .site-footer__brand { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .site-footer__top {
    grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr));
    gap: 30px;
  }
  .site-footer__brand { grid-column: auto; }
}

.site-footer__brand {
  display: grid;
  gap: 16px;
  justify-items: start;
  align-content: start;
}

.brand--footer .brand__name { font-size: 20px; }

.site-footer__note {
  max-width: 30em;
  color: var(--steel);
  font-size: 14.5px;
  line-height: 1.75;
}

.site-footer__title {
  margin-bottom: 14px;
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.site-footer__links {
  display: grid;
  gap: 10px;
}

.site-footer__links a {
  color: var(--steel);
  font-size: 14.5px;
  text-decoration: none;
  transition: color 0.18s ease, padding-left 0.18s ease;
}

.site-footer__links a:hover {
  color: var(--amber);
  padding-left: 4px;
}

.site-footer__contact {
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.contact-list {
  display: grid;
  gap: 12px;
}

@media (min-width: 860px) {
  .contact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 34px; }
}

.contact-list__row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(38, 49, 79, 0.9);
}

.contact-list__k {
  flex: 0 0 auto;
  min-width: 72px;
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.contact-list__v {
  color: var(--white);
  font-size: 14.5px;
  word-break: break-word;
}

.copy-btn {
  margin-left: auto;
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--steel);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.copy-btn:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.copy-btn.is-copied {
  border-color: rgba(47, 217, 179, 0.6);
  background: rgba(47, 217, 179, 0.1);
  color: var(--teal);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 26px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--steel);
  font-size: 13px;
}

.site-footer__closing {
  flex: 1 1 220px;
  color: var(--amber);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.site-footer__legal,
.site-footer__copy { font-size: 12.5px; color: var(--steel); }

/* ---------- 通用组件 ---------- */
.panel {
  position: relative;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--felt);
  box-shadow: var(--shadow-soft);
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.panel:hover {
  background: linear-gradient(0deg, rgba(255, 179, 71, 0.08), rgba(255, 179, 71, 0.02)), var(--felt);
  border-color: rgba(255, 179, 71, 0.32);
  transform: translateY(-2px);
}

.panel--flush { padding: 0; overflow: hidden; }

.panel--accent { border-left: 3px solid var(--red); }

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.section-head__title { color: var(--white); }

.section-head__desc {
  max-width: 62ch;
  color: var(--steel);
  font-size: 15.5px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease,
    border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--red);
  color: #FFFFFF;
  box-shadow: 0 12px 30px -16px rgba(255, 59, 92, 0.95);
}

.btn--primary:hover { color: #FFFFFF; box-shadow: 0 16px 34px -14px rgba(255, 59, 92, 0.95); }

.btn--gold {
  background: var(--amber);
  color: #1A1206;
}

.btn--gold:hover { color: #1A1206; }

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

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

.btn--sm { padding: 8px 15px; font-size: 13px; letter-spacing: 0.08em; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(27, 37, 64, 0.6);
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.chip:hover { color: var(--white); border-color: var(--steel); }

.chip[aria-pressed="true"],
.chip.is-active {
  border-color: rgba(255, 59, 92, 0.6);
  background: rgba(255, 59, 92, 0.12);
  color: #FFD3DC;
}

.chip--amber { border-color: rgba(255, 179, 71, 0.45); color: var(--amber); background: rgba(255, 179, 71, 0.08); }
.chip--teal { border-color: rgba(47, 217, 179, 0.45); color: var(--teal); background: rgba(47, 217, 179, 0.08); }

.stat { display: grid; gap: 4px; }

.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 46px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--amber);
  line-height: 1.1;
}

.stat__label { color: var(--steel); font-size: 13.5px; letter-spacing: 0.06em; }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0;
  margin: 0 0 20px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.crumbs li { display: inline-flex; align-items: center; gap: 8px; }

.crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.crumbs a { color: var(--steel); text-decoration: none; }
.crumbs a:hover { color: var(--amber); }
.crumbs [aria-current="page"] { color: var(--white); }

.page-head {
  display: grid;
  gap: 14px;
  padding: 52px 0 34px;
}

.page-head__title { color: var(--white); }

.page-head__lede {
  max-width: 46ch;
  color: var(--steel);
  font-size: 17px;
}

.disclosure {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(19, 26, 46, 0.72);
  overflow: hidden;
}

.disclosure + .disclosure { margin-top: 12px; }

.disclosure__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.disclosure__summary::-webkit-details-marker { display: none; }

.disclosure__summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.disclosure[open] > .disclosure__summary::before {
  content: "–";
  border-color: rgba(255, 179, 71, 0.5);
}

.disclosure__body {
  padding: 0 20px 20px 56px;
  color: var(--steel);
  font-size: 15.5px;
}

.disclosure__body p { max-width: 56ch; }

/* 图像容器（页面阶段放图） */
.media {
  position: relative;
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

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

.media--wide { aspect-ratio: 16 / 9; }
.media--film { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media--cut { clip-path: polygon(0 0, 100% 0, 100% 89%, 0 100%); }

.media--placeholder {
  background-color: var(--ink-2);
  background-image: repeating-linear-gradient(
    115deg,
    rgba(38, 49, 79, 0.85) 0 1px,
    transparent 1px 14px
  );
}

.media__cap {
  margin-top: 10px;
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* 时间轴母题 */
.timeline {
  position: relative;
  display: grid;
  gap: 22px;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber), rgba(255, 179, 71, 0));
}

.timeline__item { position: relative; }

.timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 10px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--amber);
  border-radius: 50%;
  background: var(--ink);
}

.timeline__date {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.timeline__text { color: var(--steel); font-size: 15.5px; }
.timeline__text strong { color: var(--white); }

/* 回放胶片条母题 */
.reel {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ink-2);
  overflow: hidden;
}

.reel__tick {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  padding: 12px 12px 22px;
  border-right: 1px solid var(--line);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  opacity: 0.28;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reel__tick:last-child { border-right: 0; }

.reel__tick::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 10px;
  height: 2px;
  background: var(--teal);
  box-shadow: 0 0 12px -4px rgba(47, 217, 179, 0.9);
}

.reel.is-lit .reel__tick { animation: tickLit 0.4s ease both; }
.reel.is-lit .reel__tick:nth-child(1) { animation-delay: 0ms; }
.reel.is-lit .reel__tick:nth-child(2) { animation-delay: 80ms; }
.reel.is-lit .reel__tick:nth-child(3) { animation-delay: 160ms; }
.reel.is-lit .reel__tick:nth-child(4) { animation-delay: 240ms; }
.reel.is-lit .reel__tick:nth-child(5) { animation-delay: 320ms; }
.reel.is-lit .reel__tick:nth-child(6) { animation-delay: 400ms; }
.reel.is-lit .reel__tick:nth-child(7) { animation-delay: 480ms; }
.reel.is-lit .reel__tick:nth-child(8) { animation-delay: 560ms; }

@keyframes tickLit {
  from { opacity: 0.16; transform: translateY(5px); }
  to { opacity: 1; transform: none; }
}

/* 叠层卡片母题 */
.stack { position: relative; display: grid; gap: 14px; }

.stack__card {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(27, 37, 64, 0.95), rgba(19, 26, 46, 0.95));
}

.stack__card:nth-child(2) { margin-left: 14px; }
.stack__card:nth-child(3) { margin-left: 28px; }

/* 显现动效 */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* 章节高亮（页面索引链接） */
[data-section-link][aria-current="true"] {
  color: var(--red);
  border-color: rgba(255, 59, 92, 0.55);
}

/* ---------- 响应式：页头 ---------- */
@media (max-width: 1120px) {
  .site-nav { gap: 18px; }
  .site-nav__list { gap: 14px; }
  .site-nav__link { font-size: 14.5px; letter-spacing: 0.06em; }
  .site-nav__utility { padding-left: 14px; gap: 10px; }
}

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: grid;
    gap: 0;
    align-items: stretch;
    padding: 10px 20px 24px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: rgba(11, 16, 32, 0.98);
    border-bottom: 1px solid var(--line);
    clip-path: inset(0 0 100% 0);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s ease, clip-path 0.28s ease, visibility 0.28s ease;
  }

  .site-nav[data-open] {
    clip-path: inset(0 0 0 0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    display: grid;
    gap: 0;
  }

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

  .site-nav__link {
    display: block;
    padding: 15px 2px;
    font-size: 16px;
    letter-spacing: 0.1em;
  }

  .site-nav__link::after { bottom: 0; right: auto; width: 34px; }

  .site-nav__link[aria-current="page"] { letter-spacing: 0.18em; }

  .site-nav__utility {
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: 18px;
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 560px) {
  .brand__meta { display: none; }
  .brand__mark { width: 38px; height: 38px; border-radius: 10px; }
  .brand__name { font-size: 17px; letter-spacing: 0.06em; }
  .site-header__inner { gap: 12px; }
  .site-header__gap { min-width: 8px; }
  body { font-size: 16px; }
  .site-footer { margin-top: 68px; padding-top: 48px; }
}

@media (max-width: 420px) {
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 9px 12px; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .reel__tick { opacity: 1; }
  .read-progress__bar { transition: none; }
}