/* ============================================================
   OG视讯中心 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   页面特色布局由页面专属 CSS 继续扩展
   ============================================================ */

/* ---------- 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, figcaption, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* ---------- 变量 ---------- */
:root {
  /* 色板 */
  --ink: #0A0F2C;
  --ink-2: #141A3E;
  --haze: #3A3A5C;
  --paper: #F1E7D6;
  --paper-2: #D6C9B2;
  --cyan: #45E0E6;
  --cyan-deep: #0A5A60;
  --amber: #F3B14A;
  --coral: #FF6B6B;
  --ivory: #EEF0FF;
  --muted: #A6ACC9;
  --hair: #2C3466;

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* 字号阶梯 56 / 40 / 28 / 20 / 16 / 14 / 12 */
  --fs-56: clamp(36px, 5vw, 56px);
  --fs-40: clamp(28px, 3.6vw, 40px);
  --fs-28: clamp(22px, 2.4vw, 28px);
  --fs-20: 20px;
  --fs-16: 16px;
  --fs-14: 14px;
  --fs-12: 12px;

  /* 布局 */
  --rail: 88px;
  --shell: 1280px;
  --gap: clamp(16px, 2.4vw, 32px);

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  background: var(--ink);
  color: var(--ivory);
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  padding-left: var(--rail);
  padding-top: 118px;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.18;
}

h1 { font-size: var(--fs-56); font-weight: 900; }
h2 { font-size: var(--fs-40); font-weight: 900; }
h3 { font-size: var(--fs-28); }
h4 { font-size: var(--fs-20); }

p { max-width: 34em; }

code, kbd, samp, .og-num, time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: .04em;
}

::selection {
  background: var(--cyan);
  color: #04222A;
}

#main-content { scroll-margin-top: 128px; }

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

/* ---------- 跳过链接 ---------- */
.og-skip {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--cyan);
  color: #04222A;
  font-size: var(--fs-14);
  font-weight: 700;
  transform: translateY(-220%);
  transition: transform .18s var(--ease);
}

.og-skip:focus { transform: translateY(0); }

/* ---------- 滚动进度 ---------- */
.og-progress {
  position: fixed;
  top: 0;
  left: var(--rail);
  right: 0;
  height: 2px;
  background: rgba(44, 52, 102, .5);
  z-index: 90;
  pointer-events: none;
}

.og-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width .12s linear;
}

/* ---------- 左竖轨 ---------- */
.og-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border-right: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(20, 26, 62, .72), rgba(10, 15, 44, .1) 55%, rgba(20, 26, 62, .55));
  pointer-events: none;
}

.og-rail__line {
  width: 1px;
  height: 88px;
  background: linear-gradient(180deg, transparent, var(--cyan), transparent);
}

.og-rail__note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .3em;
  color: var(--muted);
  text-transform: uppercase;
}

.og-rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

/* ---------- 页头与悬浮胶囊 ---------- */
.og-header {
  position: relative;
  z-index: 60;
}

.og-capsule {
  position: fixed;
  top: 18px;
  left: calc(var(--rail) + 24px);
  width: min(1180px, calc(100vw - var(--rail) - 48px));
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 9px 14px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: rgba(20, 26, 62, .9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: padding .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

@supports not ((-webkit-backdrop-filter: blur(4px)) or (backdrop-filter: blur(4px))) {
  .og-capsule { background: #141A3E; }
}

.og-header[data-scrolled="true"] .og-capsule {
  padding: 6px 12px;
  border-color: rgba(69, 224, 230, .35);
  background: rgba(11, 16, 45, .94);
}

/* 品牌 */
.og-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 3px 12px 3px 3px;
  border-radius: 999px;
  flex: 0 0 auto;
}

.og-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--cyan), #1C6E86);
  color: #04222A;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}

.og-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.og-brand__name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  transition: color .18s var(--ease);
}

.og-brand__sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .06em;
}

.og-brand:hover .og-brand__name { color: var(--cyan); }

/* 主导航 */
.og-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.og-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
  overflow: hidden;
}

.og-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: var(--fs-14);
  color: var(--ivory);
  white-space: nowrap;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.og-nav__link:hover {
  color: var(--cyan);
  background: rgba(69, 224, 230, .1);
  border-color: rgba(69, 224, 230, .4);
}

.og-nav__link[aria-current="page"] {
  color: var(--cyan);
  border-color: rgba(69, 224, 230, .55);
  background: rgba(69, 224, 230, .08);
  font-weight: 700;
}

.og-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 50%;
  width: 4px;
  height: 4px;
  margin-top: -2px;
  border-radius: 50%;
  background: var(--amber);
}

.og-nav__link[aria-current="page"] { padding-left: 18px; }

/* 时间戳 */
.og-stamps {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.og-stamp {
  display: inline-flex;
  flex-direction: column;
  gap: 1px;
  padding-left: 10px;
  border-left: 1px solid var(--hair);
  line-height: 1.2;
}

.og-stamp__k {
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--muted);
}

.og-stamp__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--amber);
}

/* 常驻入口 */
.og-quick {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
}

.og-quick__link {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ivory);
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}

.og-quick__link:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(69, 224, 230, .1);
}

.og-quick__link--accent {
  background: var(--amber);
  border-color: var(--amber);
  color: #241602;
  font-weight: 700;
}

.og-quick__link--accent:hover {
  background: #FFC768;
  border-color: #FFC768;
  color: #241602;
}

/* 汉堡按钮 */
.og-burger {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ivory);
  flex: 0 0 auto;
}

.og-burger__box {
  display: grid;
  gap: 4px;
  width: 16px;
}

.og-burger__bar {
  display: block;
  height: 2px;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.og-capsule[data-open="true"] .og-burger__bar:first-child { transform: translateY(3px) rotate(45deg); }
.og-capsule[data-open="true"] .og-burger__bar:last-child { transform: translateY(-3px) rotate(-45deg); }

/* ---------- 正文容器与分屏 ---------- */
.og-main { display: block; }

.og-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

.og-split {
  display: grid;
  grid-template-columns: minmax(0, 32fr) minmax(0, 68fr);
  gap: var(--gap);
  align-items: start;
}

.og-split--reverse { grid-template-columns: minmax(0, 68fr) minmax(0, 32fr); }

.og-split__rail { position: relative; }

.og-split__body { min-width: 0; }

/* ---------- 编号章节 ---------- */
.og-section {
  padding: clamp(40px, 6vw, 80px) 0;
  border-top: 1px solid var(--hair);
}

.og-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  margin-bottom: 18px;
}

.og-section__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-40);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1;
  color: var(--amber);
}

.og-section__title {
  font-size: var(--fs-40);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.14;
}

.og-section__lede {
  margin-top: 12px;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- 暖纸阅读区 ---------- */
.og-paper {
  --ink: #EFE4D0;
  --ink-2: #E7DAC2;
  --ivory: #141A3E;
  --muted: #5A5A78;
  --hair: #D6C9B2;
  --cyan: #0A5A60;
  --amber: #8A5A10;
  background: var(--paper);
  color: #141A3E;
  border: 1px solid var(--paper-2);
  border-top: 3px solid var(--ink-2);
  padding: clamp(20px, 3vw, 40px);
}

.og-paper a { color: #0A5A60; text-decoration: underline; text-underline-offset: 3px; }
.og-paper ::selection { background: #141A3E; color: var(--paper); }

/* ---------- 卡片与网格 ---------- */
.og-card {
  background: var(--ink-2);
  border: 1px solid var(--hair);
  border-radius: 4px;
  padding: clamp(16px, 2vw, 24px);
}

.og-card--lift {
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.og-card--lift:hover {
  transform: translateY(-4px);
  border-color: rgba(69, 224, 230, .6);
  background: #17204A;
}

.og-grid { display: grid; gap: 16px; }

.og-grid--2 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.og-grid--3 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }

/* ---------- 小件 ---------- */
.og-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px dashed rgba(69, 224, 230, .5);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
  white-space: nowrap;
}

.og-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--amber);
}

.og-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .3em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 面包屑 ---------- */
.og-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--muted);
}

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

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

.og-crumbs__link { transition: color .18s var(--ease); }
.og-crumbs__link:hover { color: var(--cyan); }
.og-crumbs__current { color: var(--amber); }

/* ---------- 按钮 ---------- */
.og-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: .02em;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.og-btn--cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04222A;
}

.og-btn--cyan:hover { background: #7BEDF1; border-color: #7BEDF1; }

.og-btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: #241602;
}

.og-btn--amber:hover { background: #FFC768; border-color: #FFC768; }

.og-btn--ghost { color: var(--ivory); }

.og-btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(69, 224, 230, .1);
}

/* ---------- 筛选 ---------- */
.og-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.og-filter__btn {
  padding: 8px 14px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.og-filter__btn:hover {
  color: var(--ivory);
  border-color: var(--cyan);
}

.og-filter__btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04222A;
  font-weight: 700;
}

[data-filterable][hidden] { display: none !important; }

/* ---------- 复制按钮 ---------- */
.og-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.og-copy:hover { border-color: var(--amber); color: #FFC768; }

/* ---------- 提示浮条 ---------- */
.og-toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  z-index: 140;
  transform: translate(-50%, 12px);
  padding: 10px 20px;
  border: 1px solid var(--cyan);
  border-radius: 999px;
  background: var(--ink-2);
  color: var(--ivory);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease);
}

.og-toast[data-show="true"] {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- 图片容器 ---------- */
.og-media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--hair);
  border-radius: 4px;
  background: linear-gradient(150deg, #17204A, var(--ink) 58%, #131B45);
}

.og-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(69, 224, 230, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(69, 224, 230, .07) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.og-media > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.og-media--16x9 { aspect-ratio: 16 / 9; }
.og-media--4x3 { aspect-ratio: 4 / 3; }
.og-media--1x1 { aspect-ratio: 1 / 1; }
.og-media--21x9 { aspect-ratio: 21 / 9; }

.og-media__cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 4px 10px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: rgba(10, 15, 44, .78);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

@supports not (aspect-ratio: 16 / 9) {
  .og-media { min-height: 200px; }
}

/* ---------- 入场显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}

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

/* ---------- 页脚 ---------- */
.og-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 104px);
  background: var(--ink-2);
  border-top: 1px solid var(--hair);
  color: var(--ivory);
}

.og-footer__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 68px) clamp(16px, 3vw, 40px) clamp(24px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(230px, 1fr) minmax(0, 1.85fr);
  gap: clamp(28px, 5vw, 64px);
}

.og-footer__brand { min-width: 0; }

.og-brand--footer {
  padding: 0;
  gap: 12px;
}

.og-brand--footer .og-brand__mark {
  width: 42px;
  height: 42px;
  font-size: 15px;
}

.og-brand--footer .og-brand__name { font-size: 18px; }

.og-footer__note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
  max-width: 30em;
}

.og-footer__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.og-footer__cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.og-footer__col { min-width: 0; }

.og-footer__title {
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--amber);
}

.og-footer__links {
  display: grid;
  gap: 8px;
}

.og-footer__link {
  font-size: var(--fs-14);
  color: var(--muted);
  word-break: break-word;
  transition: color .18s var(--ease);
}

.og-footer__link:hover { color: var(--cyan); }

.og-footer__base {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px clamp(16px, 3vw, 40px) 30px;
  border-top: 1px solid var(--hair);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  font-size: var(--fs-12);
  color: var(--muted);
}

.og-footer__addr,
.og-footer__hours { max-width: 44em; }

.og-footer__icp,
.og-footer__copy {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.og-footer__copy { margin-left: auto; }

/* ---------- 回到顶部 ---------- */
.og-totop {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 100;
  padding: 10px 16px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: rgba(20, 26, 62, .94);
  color: var(--ivory);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: .08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s var(--ease), border-color .2s var(--ease);
}

.og-totop[data-show="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.og-totop:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ============================================================
   响应式
   ============================================================ */

/* 中等宽度：收紧胶囊内部密度 */
@media (max-width: 1360px) {
  .og-capsule { gap: 10px; padding: 8px 12px; }
  .og-nav__link { padding: 7px 10px; font-size: 13px; }
  .og-quick__link { padding: 7px 10px; font-size: 12px; }
  .og-stamp { padding-left: 8px; }
  .og-stamp__v { font-size: 11px; }
}

/* 平板横向：隐藏时间戳与品牌副行 */
@media (max-width: 1200px) {
  .og-stamps { display: none; }
  .og-brand__sub { display: none; }
}

/* 取消左竖轨 */
@media (max-width: 1024px) {
  :root { --rail: 0px; }
  .og-rail { display: none; }
  .og-progress { left: 0; }
  .og-split,
  .og-split--reverse { grid-template-columns: minmax(0, 1fr); }
}

/* 移动端：胶囊落到底部 */
@media (max-width: 900px) {
  body {
    padding-top: 24px;
    padding-left: 0;
    padding-bottom: 108px;
  }

  .og-capsule {
    top: auto;
    bottom: 12px;
    left: 12px;
    right: 12px;
    width: auto;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 18px;
  }

  .og-header[data-scrolled="true"] .og-capsule { padding: 8px 10px; }

  .og-burger { display: inline-flex; }

  .og-nav {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(100% + 10px);
    padding: 10px;
    border: 1px solid var(--hair);
    border-radius: 18px;
    background: var(--ink-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s var(--ease);
  }

  .og-capsule[data-open="true"] .og-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .og-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    overflow: visible;
  }

  .og-nav__link {
    display: block;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
  }

  .og-nav__link[aria-current="page"] { padding-left: 24px; }
  .og-nav__link[aria-current="page"]::before { left: 12px; }

  .og-quick { margin-left: auto; }

  .og-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .og-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .og-footer__copy { margin-left: 0; }

  .og-totop {
    right: 16px;
    bottom: 84px;
  }
}

/* 小屏：压缩常驻入口 */
@media (max-width: 560px) {
  :root { --fs-56: 34px; --fs-40: 26px; }

  .og-brand__name { font-size: 13px; }
  .og-brand__mark { width: 30px; height: 30px; font-size: 12px; }
  .og-brand { padding-right: 4px; gap: 8px; }

  .og-quick { gap: 4px; }
  .og-quick__link { padding: 6px 8px; font-size: 11px; }

  .og-burger__label { display: none; }
  .og-burger { padding: 8px 10px; }

  .og-footer__cols { grid-template-columns: minmax(0, 1fr); }
  .og-btn { padding: 10px 15px; font-size: 13px; }
}

/* ---------- 减少动效 ---------- */
@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] {
    opacity: 1;
    transform: none;
  }

  .og-progress__bar { transition: none; }
}