/* ============================================================
   365棋牌电玩 · 共享样式表 /assets/site.css
   高原夜色 + 经幡五色 + 电玩城霓虹；左上切角为统一形状语言
   ============================================================ */

/* ---------- 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; }

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

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

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

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

/* ---------- tokens ---------- */
:root {
  --night: #120C1E;
  --night-soft: #1A1226;
  --paper: #F7F3EA;
  --ink: #1A1226;
  --vermilion: #C93A2B;
  --vermilion-deep: #8E2318;
  --turquoise: #1F8A7A;
  --turquoise-deep: #0E4F49;
  --gold: #D9A441;
  --neon: #7A3FF2;
  --cyan: #29E0D6;
  --sand: #A79C8C;

  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --cut: 14px;
  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --hair: rgba(247, 243, 234, 0.16);
  --hair-dark: rgba(26, 18, 38, 0.14);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 中文排版基底 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(28px, 4.4vw, 46px); }
h2 { font-size: clamp(22px, 3vw, 34px); }
h3 { font-size: clamp(18px, 2.2vw, 22px); }

p { text-wrap: pretty; }

strong { font-weight: 700; }

::selection {
  background: var(--neon);
  color: var(--paper);
}

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

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

/* ---------- 形状工具 ---------- */
.cut {
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--vermilion), var(--gold) 30%, var(--turquoise) 62%, transparent 100%);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--turquoise);
}

/* ---------- 布局容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr); }

/* ---------- 深色语境 ---------- */
.on-dark {
  background: var(--night);
  color: var(--paper);
}

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

.on-dark .rule { background: linear-gradient(90deg, var(--gold), var(--cyan) 45%, transparent); }

/* ============================================================
   跳转链接 + 滚动进度
   ============================================================ */
.skip-link {
  position: absolute;
  left: 50%;
  top: -120px;
  transform: translateX(-50%);
  z-index: 400;
  padding: 12px 24px;
  background: var(--cyan);
  color: var(--night);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%, 0 10px);
  transition: top 0.24s var(--ease);
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  width: 0;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--vermilion), var(--gold) 26%, var(--turquoise) 52%, var(--neon) 76%, var(--cyan));
}

/* ============================================================
   页头：居中刊头 + 栏目索引
   ============================================================ */
.site-header {
  position: relative;
  color: var(--paper);
  background:
    radial-gradient(90% 130% at 10% 0%, rgba(122, 63, 242, 0.42), transparent 62%),
    radial-gradient(80% 120% at 90% 4%, rgba(31, 138, 122, 0.34), transparent 60%),
    linear-gradient(180deg, #170E26 0%, var(--night) 100%);
  border-bottom: 1px solid var(--hair);
}

.site-header::after {
  content: "";
  display: block;
  height: 3px;
  transform: skewX(-20deg) scaleX(0.94);
  transform-origin: left center;
  background: linear-gradient(
    90deg,
    var(--vermilion) 0 20%,
    var(--gold) 20% 40%,
    var(--turquoise) 40% 60%,
    var(--neon) 60% 80%,
    var(--cyan) 80% 100%
  );
  opacity: 0.85;
}

.masthead {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(18px, 2.6vw, 32px) var(--gutter) clamp(10px, 1.6vw, 16px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.masthead__aside {
  position: relative;
  padding-left: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--sand);
  white-space: nowrap;
}

.masthead__aside::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 20px;
  height: 1px;
  transform: translateY(-50%) skewY(-12deg);
  background: linear-gradient(90deg, var(--gold), transparent);
}

.masthead__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
}

.masthead__name {
  font-family: var(--font-serif);
  font-size: clamp(26px, 4.2vw, 44px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.09em;
  background: linear-gradient(96deg, var(--paper) 8%, var(--gold) 50%, var(--cyan) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.masthead__motto {
  font-family: var(--font-mono);
  font-size: clamp(10px, 1.2vw, 12px);
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--cyan);
  opacity: 0.92;
}

.masthead__cta {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--night);
  background: linear-gradient(126deg, var(--gold) 0%, #F0C46A 58%, var(--cyan) 100%);
  filter: drop-shadow(0 6px 14px rgba(217, 164, 65, 0.3));
  transition: transform 0.28s var(--ease), filter 0.28s var(--ease);
}

.masthead__cta::after {
  content: "↗";
  font-size: 13px;
}

.masthead__cta:hover {
  transform: translateY(-4px);
  filter: drop-shadow(0 9px 16px rgba(122, 63, 242, 0.55));
}

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  width: max-content;
  margin: 0 auto 12px;
  padding: 10px 20px;
  border: 1px solid var(--hair);
  color: var(--paper);
  font-size: 14px;
  letter-spacing: 0.18em;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 0.28s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(4.25px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-4.25px) rotate(-45deg);
}

/* 栏目索引 */
.site-nav {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter) 12px;
}

.nav-list {
  display: flex;
  justify-content: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.nav-link {
  position: relative;
  display: block;
  padding: 12px clamp(10px, 1.6vw, 20px) 15px;
  font-size: 15px;
  letter-spacing: 0.14em;
  white-space: nowrap;
  color: rgba(247, 243, 234, 0.78);
  transition: color 0.24s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 6px;
  width: 0;
  height: 2px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transition: width 0.3s var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { width: calc(100% - 28px); }

.nav-link[aria-current="page"] { color: var(--gold); }
.nav-link[aria-current="page"]::after { width: calc(100% - 28px); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 88px);
  color: var(--paper);
  background:
    radial-gradient(80% 110% at 6% 0%, rgba(201, 58, 43, 0.22), transparent 58%),
    radial-gradient(70% 95% at 92% 8%, rgba(41, 224, 214, 0.14), transparent 60%),
    var(--night);
}

.footer-ribbon {
  position: absolute;
  top: 0;
  left: 50%;
  width: min(560px, 74%);
  height: 4px;
  transform: translateX(-50%) skewX(-20deg);
  background: linear-gradient(
    90deg,
    var(--vermilion) 0 20%,
    var(--gold) 20% 40%,
    var(--turquoise) 40% 60%,
    var(--neon) 60% 80%,
    var(--cyan) 80% 100%
  );
  opacity: 0.9;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(38px, 4.8vw, 64px) var(--gutter) 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(24px, 3.6vw, 56px);
  padding-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--hair);
}

.footer-brand__name {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.4vw, 28px);
  letter-spacing: 0.1em;
  color: var(--paper);
}

.footer-brand__motto {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--gold);
}

.footer-brand__note {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(247, 243, 234, 0.62);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--sand);
}

.footer-links li {
  font-size: 14px;
  line-height: 2.1;
  color: rgba(247, 243, 234, 0.78);
}

.footer-links a {
  display: inline-block;
  transition: color 0.24s var(--ease);
}

.footer-links a::before {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: 0;
  height: 1px;
  margin-right: 0;
  background: var(--cyan);
  transition: width 0.24s var(--ease), margin-right 0.24s var(--ease);
}

.footer-links a:hover { color: var(--cyan); }
.footer-links a:hover::before { width: 14px; margin-right: 6px; }

.footer-contact .footer-links li {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.footer-contact__addr {
  margin-top: 14px;
  max-width: 30ch;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(247, 243, 234, 0.55);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
}

.footer-bottom__note {
  max-width: 52ch;
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.5);
}

.footer-bottom__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(247, 243, 234, 0.72);
}

/* ============================================================
   通用组件
   ============================================================ */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--hair-dark);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.panel--dark {
  color: var(--paper);
  background: linear-gradient(158deg, rgba(122, 63, 242, 0.18) 0%, rgba(18, 12, 30, 0.94) 62%), var(--night);
  box-shadow: inset 0 0 0 1px var(--hair);
}

.panel--lift {
  transition: transform 0.3s var(--ease), filter 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.panel--lift:hover {
  transform: translateY(-4px);
  filter: drop-shadow(0 0 12px rgba(122, 63, 242, 0.42));
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 10px 24px;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hair-dark);
}

.section-head__title {
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: 0.04em;
}

.section-head__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sand);
}

.on-dark .section-head { border-bottom-color: var(--hair); }
.on-dark .section-head__note { color: rgba(247, 243, 234, 0.6); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--turquoise-deep);
  background: rgba(31, 138, 122, 0.12);
  border: 1px solid rgba(31, 138, 122, 0.36);
}

.tag--dark {
  color: var(--cyan);
  background: rgba(41, 224, 214, 0.1);
  border-color: rgba(41, 224, 214, 0.34);
}

.tag--gold {
  color: #6B4B06;
  background: rgba(217, 164, 65, 0.2);
  border-color: rgba(217, 164, 65, 0.46);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  border: 1px solid transparent;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: transform 0.26s var(--ease), color 0.26s var(--ease), background-color 0.26s var(--ease), border-color 0.26s var(--ease);
}

.btn--primary {
  color: var(--night);
  background: linear-gradient(120deg, var(--gold) 0%, #EFC470 55%, var(--cyan) 100%);
}

.btn--primary:hover { transform: translateY(-3px); }

.btn--ghost {
  color: var(--paper);
  background: transparent;
  border-color: rgba(247, 243, 234, 0.34);
}

.btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.btn--dark {
  color: var(--paper);
  background: linear-gradient(120deg, var(--vermilion) 0%, var(--neon) 100%);
}

.btn--dark:hover { transform: translateY(-3px); }

.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border-left: 2px solid var(--gold);
}

.metric__value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--turquoise);
}

.on-dark .metric__value { color: var(--cyan); }

.metric__label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sand);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

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

.breadcrumb li + li::before {
  content: "／";
  margin: 0 8px;
  color: rgba(167, 156, 140, 0.6);
}

.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.breadcrumb a:hover {
  color: var(--turquoise);
  border-bottom-color: currentColor;
}

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

.on-dark .breadcrumb { color: rgba(247, 243, 234, 0.62); }
.on-dark .breadcrumb [aria-current="page"] { color: var(--cyan); }

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.prose h2 {
  margin: 1.6em 0 0.6em;
  font-size: clamp(20px, 2.4vw, 26px);
}

.prose h3 {
  margin: 1.4em 0 0.5em;
  font-size: 18px;
}

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

.prose ul,
.prose ol { margin: 1em 0; }

.prose li {
  position: relative;
  padding-left: 22px;
  margin: 0.4em 0;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--vermilion);
  transform: skewX(-30deg);
}

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

.prose ol li::before {
  counter-increment: prose-list;
  content: counter(prose-list, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--turquoise);
}

.prose strong { color: var(--vermilion-deep); }

.on-dark .prose { color: rgba(247, 243, 234, 0.88); }
.on-dark .prose strong { color: var(--gold); }

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--night);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(41, 224, 214, 0.1) 0 2px,
    transparent 2px 14px
  );
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.media-frame > img,
.media-frame > svg,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(18, 12, 30, 0.9), transparent);
}

/* ---------- 标签页 ---------- */
.tabs { display: block; }

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hair-dark);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs__list::-webkit-scrollbar { display: none; }

.tab {
  padding: 9px 18px;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: transparent;
  border: 1px solid rgba(26, 18, 38, 0.18);
  white-space: nowrap;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.tab:hover { border-color: var(--turquoise); color: var(--turquoise-deep); }

.tab[aria-selected="true"] {
  color: var(--paper);
  border-color: transparent;
  background: linear-gradient(120deg, var(--neon) 0%, var(--turquoise) 100%);
}

.on-dark .tabs__list { border-bottom-color: var(--hair); }
.on-dark .tab { color: rgba(247, 243, 234, 0.8); border-color: var(--hair); }
.on-dark .tab:hover { color: var(--cyan); border-color: var(--cyan); }
.on-dark .tab[aria-selected="true"] { color: var(--paper); border-color: transparent; }

.tab-panel { padding-top: clamp(18px, 3vw, 28px); }
.tab-panel[hidden] { display: none; }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 180;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--night);
  background: linear-gradient(135deg, var(--gold) 0%, var(--cyan) 100%);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    gap: 12px;
    padding-bottom: 4px;
  }

  .masthead__brand { order: 1; }
  .masthead__aside { order: 2; padding-left: 0; }
  .masthead__aside::before { display: none; }
  .masthead__cta { order: 3; justify-self: center; }

  .nav-toggle { display: flex; }

  .site-nav {
    overflow: hidden;
    max-height: 0;
    padding: 0 var(--gutter);
    visibility: hidden;
    transition: max-height 0.34s var(--ease), padding 0.34s var(--ease), visibility 0.34s var(--ease);
  }

  .site-nav[data-open] {
    max-height: 600px;
    padding: 6px var(--gutter) 16px;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .nav-link {
    padding: 15px 4px;
    border-bottom: 1px solid var(--hair);
    letter-spacing: 0.18em;
  }

  .nav-link::after {
    left: 4px;
    bottom: 9px;
    transform: none;
    width: 0;
  }

  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after { width: 34px; }

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

  .media-frame--wide { aspect-ratio: 4 / 3; }
  .media-frame--scroll { aspect-ratio: 16 / 9; }

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

@media (max-width: 640px) {
  .section-head { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-ribbon { width: 86%; }
  .media-frame--wide,
  .media-frame--std,
  .media-frame--scroll { aspect-ratio: 3 / 2; }
}

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

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

  .panel--lift:hover,
  .btn:hover,
  .masthead__cta:hover {
    transform: none;
  }

  .site-nav,
  .to-top,
  .skip-link,
  .nav-link::after,
  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    transition-duration: 0.001ms;
  }
}