/* ============================================================
   新宝GG · 共享站点样式 /assets/site.css
   深海蓝场域 + 电光青索引 + 珊瑚橘行动色
   ============================================================ */

:root {
  --gg-deep: #0B2545;
  --gg-abyss: #06182E;
  --gg-mid: #123A63;
  --gg-cyan: #00E5FF;
  --gg-cyan-soft: #7FE9FF;
  --gg-coral: #FF6B4A;
  --gg-coral-soft: #FFB59E;
  --gg-ice: #EAF3F8;
  --gg-white: #FFFFFF;
  --gg-graphite: #9FB3C8;
  --gg-ink: #071320;

  --gg-line: rgba(127, 233, 255, 0.28);
  --gg-line-strong: rgba(127, 233, 255, 0.55);
  --gg-line-soft: rgba(127, 233, 255, 0.16);

  --gg-bw: 2px;
  --gg-radius: 4px;
  --gg-shadow: 6px 6px 0 rgba(6, 24, 46, 0.55);
  --gg-shadow-hover: 9px 11px 0 rgba(0, 229, 255, 0.22);

  --gg-gutter: clamp(16px, 4vw, 44px);
  --gg-max: 1240px;

  --gg-font-display: "Montserrat", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --gg-font-body: "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --gg-font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 9.5rem;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--gg-font-body);
  font-size: 17px;
  line-height: 1.78;
  color: var(--gg-ice);
  background-color: var(--gg-deep);
  background-image:
    radial-gradient(1100px 620px at 82% -6%, rgba(0, 229, 255, 0.18), transparent 62%),
    radial-gradient(820px 560px at 4% 16%, rgba(255, 107, 74, 0.12), transparent 66%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }

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

button { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* ---------- 焦点反馈：珊瑚橘外环 + 电光青内环 ---------- */
:focus-visible {
  outline: 3px solid var(--gg-coral);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px var(--gg-cyan);
  border-radius: var(--gg-radius);
}

#main-content { scroll-margin-top: 9.5rem; }

/* ---------- 容器与区块 ---------- */
.gg-container {
  width: min(var(--gg-max), calc(100% - (var(--gg-gutter) * 2)));
  margin-inline: auto;
}

.gg-section { padding-block: clamp(40px, 6vw, 88px); position: relative; }

.gg-section--ice {
  background: var(--gg-ice);
  color: var(--gg-ink);
  border-block: var(--gg-bw) solid rgba(11, 37, 69, 0.18);
}
.gg-section--ice .gg-title,
.gg-section--ice .gg-display { color: var(--gg-ink); }
.gg-section--ice .gg-lede,
.gg-section--ice .gg-text-muted { color: #3D5A75; }
.gg-section--ice .gg-index { color: #0A6D86; }
.gg-section--ice .gg-index__num { color: #C4411F; }
.gg-section--ice .gg-card { background: var(--gg-white); color: var(--gg-ink); border-color: rgba(11, 37, 69, 0.2); box-shadow: 6px 6px 0 rgba(11, 37, 69, 0.12); }
.gg-section--ice .gg-card:hover { box-shadow: 9px 11px 0 rgba(11, 37, 69, 0.18); }

.gg-rule {
  height: 2px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: linear-gradient(90deg, var(--gg-cyan), rgba(127, 233, 255, 0.18) 62%, transparent);
}

/* ---------- 网格 ---------- */
.gg-grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.gg-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gg-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gg-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gg-grid--asym { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr); }

/* ---------- 文字层级 ---------- */
.gg-display {
  font-family: var(--gg-font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 5.6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--gg-white);
}

.gg-title {
  font-family: var(--gg-font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.9vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--gg-white);
}

.gg-lede {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.82;
  color: var(--gg-graphite);
  max-width: 62ch;
}

.gg-text-muted { color: var(--gg-graphite); }

.gg-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gg-cyan);
}
.gg-index__num { font-family: var(--gg-font-mono); font-weight: 600; color: var(--gg-coral); }
.gg-index--muted { color: var(--gg-graphite); transition: color 0.18s ease; }
.gg-index--muted:hover { color: var(--gg-cyan); }

.gg-num {
  font-family: var(--gg-font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--gg-coral);
}
.gg-num--cyan { color: var(--gg-cyan); }

.gg-prose { max-width: 68ch; }
.gg-prose p { margin: 0 0 1.2em; }
.gg-prose h2, .gg-prose h3 { margin: 1.6em 0 0.55em; line-height: 1.25; }
.gg-prose ul, .gg-prose ol { list-style: disc; padding-left: 1.35em; margin: 0 0 1.2em; }
.gg-prose ol { list-style: decimal; }
.gg-prose li { margin-bottom: 0.45em; }
.gg-prose strong { color: var(--gg-white); }

/* ---------- 按钮 ---------- */
.gg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: var(--gg-bw) solid var(--gg-ink);
  border-radius: var(--gg-radius);
  background: var(--gg-white);
  color: var(--gg-ink);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: var(--gg-shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.gg-btn:hover { transform: translate(-1px, -3px); box-shadow: var(--gg-shadow-hover); }

.gg-btn--primary { background: var(--gg-coral); color: var(--gg-ink); }
.gg-btn--primary:hover { background: var(--gg-coral-soft); }

.gg-btn--ghost {
  background: transparent;
  color: var(--gg-cyan);
  border-color: var(--gg-cyan);
  box-shadow: 6px 6px 0 rgba(0, 229, 255, 0.18);
}
.gg-btn--ghost:hover { background: rgba(0, 229, 255, 0.12); color: var(--gg-white); }

.gg-btn--sm { padding: 9px 15px; font-size: 13px; }

/* ---------- 标签 ---------- */
.gg-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid var(--gg-line-strong);
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.08);
  color: var(--gg-cyan-soft);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.gg-tag--coral {
  border-color: rgba(255, 107, 74, 0.6);
  background: rgba(255, 107, 74, 0.1);
  color: var(--gg-coral-soft);
}

/* ---------- 卡片 ---------- */
.gg-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--gg-mid);
  border: var(--gg-bw) solid var(--gg-line);
  border-radius: var(--gg-radius);
  box-shadow: var(--gg-shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.gg-card:hover {
  transform: translateY(-4px);
  border-color: var(--gg-line-strong);
  box-shadow: var(--gg-shadow-hover);
}
.gg-card--ice { background: var(--gg-white); color: var(--gg-ink); border-color: rgba(11, 37, 69, 0.22); }

/* ---------- 状态面板（控制台式） ---------- */
.gg-panel {
  background: var(--gg-mid);
  border: var(--gg-bw) solid var(--gg-line-strong);
  border-radius: var(--gg-radius);
  box-shadow: var(--gg-shadow);
  overflow: hidden;
}
.gg-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: var(--gg-abyss);
  border-bottom: var(--gg-bw) solid var(--gg-line);
  font-family: var(--gg-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gg-cyan);
}
.gg-panel__body { padding: clamp(16px, 2vw, 24px); }

.gg-status { display: grid; }
.gg-status__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--gg-line);
  font-size: 14px;
}
.gg-status__item:last-child { border-bottom: 0; }
.gg-status__key { color: var(--gg-graphite); letter-spacing: 0.08em; }
.gg-status__val { font-family: var(--gg-font-mono); font-weight: 600; color: var(--gg-cyan); }

/* ---------- 图片/插画容器 ---------- */
.gg-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: var(--gg-bw) solid var(--gg-line-strong);
  border-radius: var(--gg-radius);
  background:
    linear-gradient(140deg, rgba(0, 229, 255, 0.18), rgba(255, 107, 74, 0.14) 58%, rgba(11, 37, 69, 0.9));
}
.gg-media > img { width: 100%; height: 100%; object-fit: cover; }
.gg-media--wide { aspect-ratio: 21 / 9; }
.gg-media--square { aspect-ratio: 1 / 1; }
.gg-media--tall { aspect-ratio: 3 / 4; }
.gg-media--device { aspect-ratio: 4 / 3; }
.gg-media--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(234, 243, 248, 0.1) 0 1px, transparent 1px 36px),
    repeating-linear-gradient(0deg, rgba(234, 243, 248, 0.08) 0 1px, transparent 1px 36px);
  pointer-events: none;
}
.gg-media__tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 3px 10px;
  border: 1px solid var(--gg-line-strong);
  border-radius: 999px;
  background: rgba(6, 24, 46, 0.82);
  color: var(--gg-cyan-soft);
  font-size: 11.5px;
  letter-spacing: 0.12em;
}

/* ---------- 面包屑 ---------- */
.gg-breadcrumb {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gg-graphite);
}
.gg-breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.gg-breadcrumb__list li { display: inline-flex; align-items: center; gap: 8px; }
.gg-breadcrumb__list li + li::before { content: "›"; color: var(--gg-cyan); }
.gg-breadcrumb a { color: var(--gg-cyan-soft); }
.gg-breadcrumb a:hover { color: var(--gg-white); }
.gg-breadcrumb [aria-current="page"] { color: var(--gg-white); }

/* ---------- 页内索引 / 章节联动 ---------- */
[data-section-link] {
  color: var(--gg-graphite);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
[data-section-link]:hover { color: var(--gg-cyan); }
[data-section-link].is-active { color: var(--gg-cyan); border-bottom-color: var(--gg-coral); }

/* ---------- 漂移光斑 ---------- */
@keyframes gg-drift {
  from { transform: translate3d(-4%, -3%, 0) scale(1); }
  to { transform: translate3d(5%, 4%, 0) scale(1.08); }
}
.gg-aurora {
  position: absolute;
  width: min(520px, 78vw);
  height: min(520px, 78vw);
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(0, 229, 255, 0.34), rgba(255, 107, 74, 0.16) 55%, transparent 72%);
  filter: blur(50px);
  pointer-events: none;
  z-index: 0;
  animation: gg-drift 20s ease-in-out infinite alternate;
}

/* ---------- 显现 ---------- */
.gg-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.gg-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ============================================================
   头部
   ============================================================ */
.gg-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--gg-abyss);
  border-bottom: var(--gg-bw) solid var(--gg-line);
}

.gg-skip {
  position: absolute;
  left: 14px;
  top: -70px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--gg-coral);
  color: var(--gg-ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border: var(--gg-bw) solid var(--gg-ink);
  border-radius: var(--gg-radius);
  transition: top 0.18s ease;
}
.gg-skip:focus { top: 12px; }

/* 上层：品牌说明条 */
.gg-topbar {
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.14), rgba(255, 107, 74, 0.1) 58%, transparent);
  border-bottom: 1px solid var(--gg-line-soft);
}
.gg-topbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 20px;
  padding-block: 9px;
}
.gg-topbar__note {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gg-graphite);
}
.gg-topbar__actions { display: flex; flex-wrap: wrap; gap: 6px; }
.gg-topbar__link {
  padding: 4px 11px;
  border: 1px solid var(--gg-line-strong);
  border-radius: 999px;
  color: var(--gg-cyan-soft);
  font-size: 12px;
  letter-spacing: 0.09em;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.gg-topbar__link:hover {
  background: rgba(0, 229, 255, 0.16);
  border-color: var(--gg-cyan);
  color: var(--gg-white);
}

/* 品牌行 */
.gg-brandbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 13px;
}
.gg-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--gg-white);
}
.gg-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: none;
  border: var(--gg-bw) solid var(--gg-cyan);
  border-radius: var(--gg-radius);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.22), rgba(255, 107, 74, 0.18));
  box-shadow: 4px 4px 0 rgba(0, 229, 255, 0.16);
  font-family: var(--gg-font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--gg-cyan);
  letter-spacing: 0.02em;
}
.gg-brand__text { display: flex; flex-direction: column; line-height: 1.3; }
.gg-brand__name {
  font-family: var(--gg-font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.gg-brand__suffix {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gg-graphite);
}
.gg-brandbar__note {
  display: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gg-graphite);
}

/* 下层：栏目导航 */
.gg-nav {
  border-top: 1px solid var(--gg-line-soft);
}
.gg-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 2px;
}
.gg-nav__item { display: flex; }
.gg-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px 12px;
  border-bottom: 2px solid transparent;
  color: var(--gg-ice);
  font-size: 15px;
  letter-spacing: 0.04em;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.gg-nav__link:hover {
  color: var(--gg-cyan);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.12), transparent);
  border-bottom-color: var(--gg-cyan-soft);
  transform: translateY(-2px);
}
.gg-nav__link[aria-current="page"] {
  color: var(--gg-cyan);
  border-bottom-color: var(--gg-coral);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.1), transparent);
}
.gg-nav__link[aria-current="page"] .gg-nav__num { color: var(--gg-coral); opacity: 1; }
.gg-nav__num {
  font-family: var(--gg-font-mono);
  font-size: 11px;
  color: var(--gg-cyan);
  opacity: 0.72;
}

/* 移动导航按钮 */
.gg-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: var(--gg-bw) solid var(--gg-cyan);
  border-radius: var(--gg-radius);
  background: transparent;
  color: var(--gg-cyan);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}
.gg-nav-toggle:hover { background: rgba(0, 229, 255, 0.14); color: var(--gg-white); }
.gg-nav-toggle__bars {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
}
.gg-nav-toggle__bars::before,
.gg-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.gg-nav-toggle__bars::before { top: -6px; }
.gg-nav-toggle__bars::after { top: 6px; }
.gg-nav-toggle[aria-expanded="true"] .gg-nav-toggle__bars { background: transparent; }
.gg-nav-toggle[aria-expanded="true"] .gg-nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.gg-nav-toggle[aria-expanded="true"] .gg-nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 侧边快捷入口轨（仅大屏） */
.gg-rail { display: none; }

/* 阅读进度条 */
.gg-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  background: rgba(127, 233, 255, 0.12);
  pointer-events: none;
}
.gg-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gg-cyan), var(--gg-coral));
  transition: width 0.12s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.gg-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  background: var(--gg-abyss);
  border-top: var(--gg-bw) solid var(--gg-line-strong);
}
.gg-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gg-cyan), var(--gg-cyan-soft) 42%, var(--gg-coral));
}
.gg-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.4fr;
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(34px, 5vw, 64px);
}
.gg-footer__brand { min-width: 0; }
.gg-footer__title {
  margin: 10px 0 8px;
  font-family: var(--gg-font-display);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--gg-white);
}
.gg-footer__lines { display: grid; gap: 4px; font-size: 13.5px; color: var(--gg-graphite); }
.gg-footer__col { min-width: 0; }
.gg-footer__col-title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--gg-cyan);
}
.gg-footer__col-title::before { content: "/ "; color: var(--gg-coral); }
.gg-footer__links { display: grid; gap: 8px; }
.gg-footer__link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  color: var(--gg-ice);
  font-size: 14.5px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.gg-footer__link:hover { color: var(--gg-cyan); border-bottom-color: var(--gg-cyan); }
.gg-footer__meta { font-size: 13.5px; color: var(--gg-graphite); margin-bottom: 6px; }
.gg-footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 16px;
  border-top: 1px solid var(--gg-line-soft);
}
.gg-footer__bar .gg-footer__meta { margin-bottom: 0; }
.gg-footer__legal {
  font-family: var(--gg-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gg-graphite);
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 1100px) {
  .gg-brandbar__note { display: block; }
}

@media (min-width: 1400px) {
  .gg-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: fixed;
    right: 14px;
    top: 36vh;
    z-index: 70;
    padding: 12px 10px;
    background: rgba(6, 24, 46, 0.92);
    border: var(--gg-bw) solid var(--gg-line-strong);
    border-radius: var(--gg-radius);
    box-shadow: var(--gg-shadow);
  }
  .gg-rail__title {
    font-size: 10.5px;
    letter-spacing: 0.2em;
    color: var(--gg-graphite);
  }
  .gg-rail__link {
    writing-mode: vertical-rl;
    padding: 12px 8px;
    border: 1px solid var(--gg-line);
    border-radius: 2px;
    color: var(--gg-cyan-soft);
    font-size: 12.5px;
    letter-spacing: 0.14em;
    transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
  }
  .gg-rail__link:hover {
    background: rgba(0, 229, 255, 0.16);
    border-color: var(--gg-cyan);
    color: var(--gg-white);
  }
}

@media (max-width: 1024px) {
  .gg-grid--3, .gg-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gg-grid--asym { grid-template-columns: minmax(0, 1fr); }
  .gg-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gg-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 7rem; }
  #main-content { scroll-margin-top: 7rem; }

  .gg-nav-toggle { display: inline-flex; }
  .gg-nav { padding-bottom: 0; }
  .gg-nav__list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 14px;
  }
  .gg-nav[data-open="true"] .gg-nav__list { display: flex; }
  .gg-nav__item { display: block; }
  .gg-nav__link {
    width: 100%;
    padding: 13px 12px;
    border-bottom: 1px solid var(--gg-line-soft);
    border-left: 2px solid transparent;
    font-size: 15.5px;
  }
  .gg-nav__link:hover { transform: none; border-left-color: var(--gg-cyan); }
  .gg-nav__link[aria-current="page"] { border-left-color: var(--gg-coral); }
}

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .gg-grid--2, .gg-grid--3, .gg-grid--4 { grid-template-columns: minmax(0, 1fr); }
  .gg-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .gg-brand__suffix { font-size: 10.5px; letter-spacing: 0.12em; }
  .gg-topbar__note { font-size: 11.5px; letter-spacing: 0.06em; }
  .gg-topbar__actions { width: 100%; }
}

/* ============================================================
   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;
  }
  .gg-js [data-reveal] { opacity: 1; transform: none; }
  .gg-card:hover,
  .gg-btn:hover,
  .gg-nav__link:hover { transform: none; }
  .gg-aurora { animation: none; }
  .gg-progress__bar { transition: none; }
}