@charset "UTF-8";
/* ==========================================================================
   {{BRAND}} International — 国际夏校官网样式系统
   纯静态实现，无构建、无 CDN 依赖，双击 HTML 即可运行
   目录：
     01 设计令牌        02 主题层(tone)     03 基础重置
     04 排版尺度        05 布局容器         06 按钮
     07 顶栏与页头      08 导航与巨型菜单   09 移动端导航
     10 首屏 Hero       11 数据条           12 媒体与图片
     13 卡片族          14 跑马灯/滚动条    15 手风琴
     16 表单            17 页脚             18 动效与滚动入场
     19 工具类          20 响应式
   ========================================================================== */

/* ============================ 01 设计令牌 ============================ */
:root {
  /* --- 原始色板（按目标站采样还原，改这里即可整站换色）--- */
  --royale-500: #BD0F2E;   /* 品牌主色：深红 */
  --royale-600: #A50D28;
  --royale-900: #4B1320;   /* 深酒红 */
  --stone-100:  #F1EEE9;   /* 暖白 */
  --stone-200:  #D8D2CB;   /* 暖灰-边框 */
  --stone-300:  #C5BFB6;   /* 暖灰-深 */
  --ink-500:    #585957;   /* 次要文字 */
  --ink-900:    #212322;   /* 主文字 */
  --mist-100:   #EDF2F7;   /* 冷灰底 */
  --gilt-400:   #EDC88F;   /* 金：深色底强调色 */
  --danger:     #EB0005;

  /* --- 语义令牌 --- */
  --background: #FFFFFF;
  --foreground: var(--ink-900);
  --accent: var(--royale-500);
  --accent-foreground: #FFFFFF;
  --muted: var(--stone-100);
  --muted-foreground: var(--ink-500);
  --surface: var(--stone-100);
  --border: var(--stone-200);
  --ring: var(--royale-500);
  --signature-invert: 0;

  /* --- 尺度令牌 --- */
  --sp: .25rem;
  --topbar-h: 2.5rem;
  --header-h: 5.5rem;      /* 移动端页头高 */
  --header-h-lg: 8rem;     /* 桌面端页头高 */
  --gutter: 1.5rem;        /* 页面左右留白 */
  --radius: .125rem;
  --maxw: 96rem;

  /* --- 字体：开源替代，原站商业字体请勿拷贝 --- */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-serif: "Playfair Display", "Songti SC", Georgia, Cambria,
                "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* --- 动效令牌 --- */
  --ease-out: cubic-bezier(0, 0, .2, 1);
  --ease-in-out: cubic-bezier(.4, 0, .2, 1);
  --ease-soft: cubic-bezier(.22, 1, .36, 1);
  --dur: .3s;
  --dur-slow: .8s;
}

/* ============================ 02 主题层 ============================
   页面局部换色：给 <section class="tone-ink"> 即整体切换明暗语境 */
.tone-parchment { --background: var(--stone-100); --muted: var(--stone-200); --surface: #FFFFFF; }
.tone-mist      { --background: var(--mist-100); }
.tone-sand      { --background: var(--stone-200); --muted: var(--stone-100); --border: var(--stone-300); }
.tone-ink       { --background: var(--ink-900); --foreground: #FFFFFF;
                  --accent: var(--gilt-400); --accent-foreground: var(--ink-900);
                  --muted: rgba(255,255,255,.10); --surface: rgba(255,255,255,.06);
                  --muted-foreground: rgba(255,255,255,.72);
                  --border: rgba(255,255,255,.20); --signature-invert: 1; }
.tone-burgundy  { --background: var(--royale-900); --foreground: #FFFFFF;
                  --accent: var(--gilt-400); --accent-foreground: var(--ink-900);
                  --muted: rgba(255,255,255,.10); --surface: rgba(255,255,255,.06);
                  --muted-foreground: rgba(255,255,255,.72); --border: rgba(255,255,255,.20);
                  --signature-invert: 1; }
.tone-red       { --background: var(--royale-500); --foreground: #FFFFFF;
                  --accent: var(--stone-100); --accent-foreground: var(--royale-500);
                  --muted: rgba(255,255,255,.12); --surface: rgba(255,255,255,.10);
                  --muted-foreground: rgba(255,255,255,.85); --border: rgba(255,255,255,.35);
                  --signature-invert: 1; }
.tone-contrast  { --background: transparent; --foreground: #FFFFFF;
                  --border: rgba(255,255,255,.35); --muted-foreground: rgba(255,255,255,.8); }

/* ============================ 03 基础重置 ============================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
/* 打开移动端菜单时锁定滚动 */
body.is-nav-open { overflow: hidden; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }
:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; }
::selection { background: var(--royale-500); color: #fff; }

/* ============================ 04 排版尺度 ============================ */
.display-1 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(2.75rem, 7.2vw, 6.75rem);
             line-height: .98; letter-spacing: -.02em; }
.display-2 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(2.1rem, 4.6vw, 4.25rem);
             line-height: 1.04; letter-spacing: -.015em; }
.display-3 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(1.6rem, 2.9vw, 2.6rem);
             line-height: 1.12; letter-spacing: -.01em; }
.display-4 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(1.35rem, 2vw, 1.85rem);
             line-height: 1.2; }
/* 斜体强调：标题里用 <em> 包裹要突出的词 */
.display-1 em, .display-2 em, .display-3 em, .display-4 em { font-style: italic; }
.serif { font-family: var(--font-serif); }
.lead { font-size: clamp(1.0625rem, 1.35vw, 1.25rem); line-height: 1.6; color: var(--muted-foreground); }
.prose { max-width: 62ch; color: var(--muted-foreground); line-height: 1.7; }
.prose p + p { margin-top: 1.15em; }
.prose strong { color: var(--foreground); font-weight: 600; }

/* 全大写小标签：栏目标签 / 信息标签 */
.caps, .eyebrow {
  font-family: var(--font-sans); font-size: .75rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; line-height: 1.3;
}
.eyebrow { color: var(--accent); display: inline-flex; align-items: center; gap: .6rem; }
.eyebrow::before { content: ""; width: 1.75rem; height: 1px; background: currentColor; opacity: .55; }
.eyebrow--plain::before { display: none; }

/* 数字编号（01 / 02 / 03）*/

/* ============================ 05 布局容器 ============================ */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow { max-width: 62rem; }
.section { padding-block: clamp(3.5rem, 8vw, 8rem); background: var(--background); color: var(--foreground); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 5rem); }
.section + .section { border-top: 0; }

.grid { display: grid; gap: clamp(1.5rem, 3vw, 3.5rem); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.split { display: grid; gap: clamp(1.5rem, 4vw, 4rem); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 62rem) {
  .split { grid-template-columns: 5fr 7fr; align-items: start; }
  .split--even { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.stack-sm > * + * { margin-top: .75rem; }
.stack > * + * { margin-top: 1.25rem; }
.stack-lg > * + * { margin-top: 2rem; }
.section-head { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: flex-end;
                justify-content: space-between; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head__text { max-width: 46rem; }

/* ============================ 06 按钮 ============================ */
.btn {
  --btn-bg: var(--accent); --btn-fg: var(--accent-foreground); --btn-bd: transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  min-height: 3rem; padding: .8rem 1.6rem;      /* 触控区域 >= 44px */
  background: var(--btn-bg); color: var(--btn-fg);
  border: 1px solid var(--btn-bd); border-radius: 999px;
  font-size: .9375rem; font-weight: 600; letter-spacing: .01em; white-space: nowrap;
  transition: transform var(--dur) var(--ease-out), background-color var(--dur), color var(--dur), border-color var(--dur);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--sm { min-height: 2.5rem; padding: .5rem 1.1rem; font-size: .875rem; }
.btn--lg { min-height: 3.5rem; padding: 1rem 2.1rem; font-size: 1rem; }
.btn--block { display: flex; width: 100%; }
/* 轮廓按钮：跟随当前语境 */
.btn--outline { --btn-bg: transparent; --btn-fg: currentColor; --btn-bd: var(--border); }
.btn--outline:hover { --btn-bg: var(--foreground); --btn-fg: var(--background); --btn-bd: var(--foreground); }
/* 白底按钮（深色区块上用）*/
.btn--light { --btn-bg: #fff; --btn-fg: var(--ink-900); }
.btn--light:hover { --btn-bg: var(--stone-100); }
/* 文字链接按钮，带箭头位移 */
.link-arrow { display: inline-flex; align-items: center; gap: .5rem; font-weight: 600;
              font-size: .9375rem; border-bottom: 1px solid transparent; padding-bottom: 2px;
              transition: border-color var(--dur), gap var(--dur); }
.link-arrow:hover { border-color: currentColor; gap: .8rem; }
.link-arrow svg { transition: transform var(--dur) var(--ease-out); }
.link-arrow:hover svg { transform: translateX(4px); }

/* ============================ 07 顶栏与页头 ============================ */
.topbar {
  position: relative; z-index: 60;
  background: var(--ink-900); color: #fff;
  height: var(--topbar-h); font-size: .75rem;
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 100%; }
.topbar a { color: rgba(255,255,255,.78); transition: color var(--dur); }
.topbar a:hover { color: #fff; }
.topbar__group { display: flex; align-items: center; gap: .75rem; }

/* 页头：sticky + 滚动驱动变色（由 JS 打 .is-stuck） */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  color: var(--foreground);
  background: transparent;
  transition: background-color .35s var(--ease-out), color .35s var(--ease-out),
              box-shadow .35s var(--ease-out), backdrop-filter .35s;
}
.site-header__fill {           /* 滚动后浮现的毛玻璃底 */
  position: absolute; inset: 0; z-index: -2; background: rgba(255,255,255,.88);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  opacity: 0; transition: opacity .35s var(--ease-out);
}
.site-header__shade {          /* 首屏压暗，保证白字可读 */
  position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(to bottom, rgba(0,0,0,.55), transparent);
  opacity: 0; transition: opacity .35s var(--ease-out);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between;
                      gap: 1rem; height: 100%; position: relative; }
/* 状态 A：叠在首屏上 → 白字 + 顶部渐变 */
.site-header.is-overlay { color: #fff; }
.site-header.is-overlay .site-header__shade { opacity: 1; }
.site-header.is-overlay .brand { color: #fff; }
/* 状态 B：滚动后 → 深字 + 毛玻璃底 */
.site-header.is-stuck .site-header__fill { opacity: 1; }
.site-header.is-stuck { color: var(--ink-900); }

/* LOGO：用 mask 让图标跟着文字颜色走，替换时只需换 logo.svg */
.brand {
  display: block; width: 11rem; aspect-ratio: 1250 / 401; flex-shrink: 0;
  background-color: currentColor;
  -webkit-mask: url(../img/logo.svg) center / contain no-repeat;
  mask: url(../img/logo.svg) center / contain no-repeat;
  transition: color .35s var(--ease-out);
}
@media (min-width: 64rem) { .brand { width: 9.5rem; } }
@media (min-width: 80rem) { .brand { width: 16rem; } }

.icon-btn { display: inline-flex; align-items: center; justify-content: center;
            width: 3rem; height: 3rem; border-radius: 999px; transition: color var(--dur); }
.icon-btn:hover { color: var(--accent); }
.site-header__actions { display: flex; align-items: center; gap: .75rem; flex-shrink: 0; }
.site-header__nav { display: none; flex: 1; justify-content: center; }
@media (min-width: 64rem) { .site-header__nav { display: flex; } }

/* ============================ 08 导航与巨型菜单 ============================ */
.nav { display: flex; align-items: center; gap: .25rem; }
.nav__item { display: flex; }
.nav__trigger {
  display: inline-flex; align-items: center; gap: .35rem; align-self: center;
  padding: .55rem .85rem; font-size: .9375rem; font-weight: 500;
  border-radius: var(--radius); position: relative;
  transition: color var(--dur), background-color var(--dur);
}
/* 悬停：红色色块 + 白字 */
.nav__item:hover > .nav__trigger,
.nav__item:focus-within > .nav__trigger { background-color: var(--royale-500); color: #fff; }
.nav__trigger::after {         /* 悬停下划线：文字正下方 */
  content: ""; position: absolute; left: .85rem; right: .85rem; bottom: .3rem;
  height: 1px; background: currentColor; transform: scaleX(0);
  transform-origin: left; transition: transform .3s var(--ease-out);
}
.nav__item:hover .nav__trigger::after,
.nav__item:focus-within .nav__trigger::after { transform: scaleX(1); }
.nav__trigger svg { transition: transform .25s var(--ease-out); }
.nav__item:hover .nav__trigger svg { transform: rotate(180deg); }

/* 巨型菜单面板 */
.mega {
  position: absolute; top: 100%; left: 50%; translate: -50% 0;
  width: min(78rem, calc(100vw - 3rem));
  background: #fff; color: var(--ink-900);
  border: 1px solid var(--stone-200); border-radius: var(--radius);
  box-shadow: 0 32px 72px -24px rgba(33,35,34,.28);
  padding: 2.25rem 2.5rem;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .22s var(--ease-out), transform .22s var(--ease-out), visibility .22s;
  z-index: 40;
  max-height: calc(100vh - var(--header-h-lg) - 2rem); overflow-y: auto;
}
.nav__item:hover > .mega, .nav__item:focus-within > .mega { opacity: 1; visibility: visible; transform: translateY(0); }
.mega__grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 2rem 3rem; }
.mega__col { grid-column: span 4; }
.mega__col--wide { grid-column: span 8; }
.mega__title { font-size: .9375rem; font-weight: 600; margin-bottom: .9rem; }
.mega__desc { font-size: .875rem; color: var(--ink-500); margin-top: .4rem; max-width: 30ch; }
.mega__list { border-top: 1px solid var(--stone-200); padding-top: 1rem; }
.mega__list li + li { margin-top: .1rem; }
.mega__link {
  display: block; padding: .4rem 0; font-size: .9375rem; color: var(--ink-500);
  transition: color var(--dur), transform var(--dur) var(--ease-out);
}
.mega__link:hover { color: var(--royale-500); transform: translateX(4px); }
.mega__group + .mega__group { margin-top: 1.75rem; }
.mega__group-label { font-size: .75rem; font-weight: 700; letter-spacing: .1em;
                     text-transform: uppercase; color: var(--royale-500); margin-bottom: .5rem; }

/* ============================ 09 移动端导航 ============================ */
.nav-overlay {
  position: fixed; inset: 0; z-index: 70; background: #fff;
  display: flex; flex-direction: column;
  opacity: 0; visibility: hidden; transition: opacity .3s var(--ease-out), visibility .3s;
}
.nav-overlay.is-open { opacity: 1; visibility: visible; }
.nav-overlay__head { display: flex; align-items: center; justify-content: space-between;
                     height: var(--header-h); border-bottom: 1px solid var(--stone-200); flex-shrink: 0; }
.nav-overlay__body { flex: 1; overflow-y: auto; padding-bottom: 2.5rem; }
.acc__row { border-bottom: 1px solid var(--stone-200); }
.acc__trigger {
  display: flex; width: 100%; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1.25rem 0; text-align: left;
  font-family: var(--font-serif); font-size: 1.5rem; line-height: 1.2;
}
.acc__trigger svg { flex-shrink: 0; color: var(--royale-500); transition: transform .25s var(--ease-out); }
.acc__row.is-open .acc__trigger svg { transform: rotate(180deg); }
.acc__panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .32s var(--ease-out); }
.acc__panel > div { overflow: hidden; }
.acc__row.is-open .acc__panel { grid-template-rows: 1fr; }
.acc__panel-inner { border-left: 1px solid var(--royale-500); padding: 0 0 1.75rem 1.25rem; margin-bottom: .5rem; }

/* ============================ 10 首屏 Hero ============================ */
.hero { position: relative; overflow: hidden; background: var(--ink-900); color: #fff; }
.hero__media { position: absolute; inset: 0; z-index: 0; }
.hero__media img, .hero__media video { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after {          /* 保证文字对比度 */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(15,10,11,.78) 0%, rgba(15,10,11,.45) 45%, rgba(15,10,11,.18) 100%);
}
.hero__inner {
  position: relative; z-index: 1;
  min-height: calc(100svh - var(--header-h) - var(--topbar-h));
  display: flex; flex-direction: column; justify-content: flex-end;
  padding-block: clamp(3rem, 9vw, 7rem) clamp(2rem, 4vw, 3.5rem);
}
.hero__content { max-width: 56rem; }
.hero__title { margin-top: 1.25rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: clamp(1.75rem, 4vw, 2.75rem); }
.hero__foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem;
              margin-top: clamp(2.5rem, 6vw, 4.5rem); }
.scroll-cue { display: inline-flex; align-items: center; gap: .6rem;
              font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.7); }
.scroll-cue span { display: block; width: 1px; height: 2.5rem; background: rgba(255,255,255,.4); position: relative; overflow: hidden; }
.scroll-cue span::after { content: ""; position: absolute; inset: 0; background: #fff;
                          animation: cue 2s var(--ease-in-out) infinite; }
@keyframes cue { 0% { transform: translateY(-100%); } 60%,100% { transform: translateY(100%); } }

/* 内侧页面的小首屏 */
.page-hero { position: relative; background: var(--ink-900); color: #fff; overflow: hidden; }
.page-hero__media { position: absolute; inset: 0; z-index: 0; }
.page-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.page-hero__media::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(15,10,11,.82), rgba(15,10,11,.4)); }
.page-hero__inner { position: relative; z-index: 1; padding-block: clamp(3.5rem, 9vw, 7rem); }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem;
              font-size: .8125rem; color: rgba(255,255,255,.7); margin-bottom: 1.25rem; }
.breadcrumb a:hover { color: #fff; }

/* ============================ 11 数据条 ============================ */
.stats { background: var(--royale-500); color: #fff; }
.stats__grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr));
               gap: 2rem 1.5rem; padding-block: clamp(2.25rem, 4vw, 3.25rem); }
@media (min-width: 56rem) { .stats__grid { grid-template-columns: repeat(4, minmax(0,1fr)); } }
.stat__value { font-family: var(--font-serif); font-size: clamp(2.25rem, 4.4vw, 3.5rem); line-height: 1; }
.stat__label { margin-top: .6rem; font-size: .8125rem; line-height: 1.45; color: rgba(255,255,255,.82); }
.stat__label strong { display: block; color: #fff; font-weight: 600; }

/* 通用指标（浅色版） */
.metric__value { font-family: var(--font-serif); font-size: clamp(1.9rem, 3vw, 2.75rem); line-height: 1; }
.metric__label { margin-top: .5rem; font-size: .8125rem; letter-spacing: .06em;
                 text-transform: uppercase; color: var(--muted-foreground); }

/* ============================ 12 媒体与图片 ============================ */
.media { position: relative; overflow: hidden; background: var(--stone-200); }
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--zoom img { transition: transform 1.1s var(--ease-soft); }
.media--zoom:hover img, a:hover .media--zoom img { transform: scale(1.05); }
.media__veil { position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(15,10,11,.72) 0%, rgba(15,10,11,.15) 55%, transparent 100%); }

/* ============================ 13 卡片族 ============================ */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
        transition: transform var(--dur) var(--ease-out), box-shadow var(--dur), border-color var(--dur); }
.card--pad { padding: clamp(1.35rem, 2.4vw, 2rem); }
.card--hover:hover { transform: translateY(-4px); box-shadow: 0 24px 48px -28px rgba(33,35,34,.35); }
.card--link { display: block; }

/* 编号特征卡（Student Outcomes）*/
.outcome { border-top: 2px solid var(--royale-500); padding-top: 1.5rem; }
.outcome__num { font-family: var(--font-sans); font-size: .8125rem; font-weight: 700;
                letter-spacing: .08em; color: var(--royale-500); }
.outcome__title { margin: 1rem 0 .7rem; }

/* 标题下的短分隔线（参考原站版式） */
.head-rule { display: block; width: 3.5rem; height: 2px; background: var(--royale-500); margin-top: 1.5rem; }

/* 选择理由：四卡文字栅格（参考原站版式，无图） */
.reason-grid { display: grid; gap: 1.25rem; grid-template-columns: 1fr;
               margin-top: clamp(2.5rem, 5vw, 4rem); }
@media (min-width: 48rem) { .reason-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 64rem) { .reason-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.reason-card { display: flex; flex-direction: column; align-items: flex-start;
               background: var(--surface); border: 1px solid var(--border);
               border-radius: var(--radius); padding: clamp(1.4rem, 2.2vw, 1.9rem);
               transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out); }
.reason-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg, 0 12px 32px -16px rgba(33,35,34,.25)); }
.reason-card__tag { align-self: flex-start; font-family: var(--font-sans); font-size: .72rem;
                    font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
                    color: var(--royale-500); background: color-mix(in srgb, var(--royale-500) 9%, transparent);
                    padding: .32rem .6rem; border-radius: 4px; }
.reason-card__title { font-size: 1.375rem; line-height: 1.3; }
.reason-card__body { line-height: 1.7; color: var(--muted-foreground); }
.reason-card__link { margin-top: auto; padding-top: 1.25rem; }
.reason-card__link .link-arrow { font-size: .8rem; font-weight: 700; letter-spacing: .08em;
                                 text-transform: uppercase; color: var(--royale-500); }

/* 居中板块头（参考原站版式）：眉标居中、强调词红色、分隔线居中、引言衬线体 */
.section-head--center { flex-direction: column; align-items: center; text-align: center; }
.section-head--center .section-head__text { max-width: 56rem; }
.section-head--center .head-rule { margin-inline: auto; }
.section-head--center em { color: var(--royale-500); }
.lead--serif { font-family: var(--font-serif); font-size: clamp(1.05rem, 1.6vw, 1.2rem); line-height: 1.7; }

/* 「暑期一览」信息条（参考原站版式）：顶部行 + 六列指标 + 底部按钮行 */
.glance { background: var(--stone-100); border-radius: var(--radius);
          padding: clamp(1.25rem, 2.5vw, 1.75rem) clamp(1.25rem, 2.5vw, 2rem);
          margin-top: clamp(2.25rem, 4vw, 3.25rem); }
.glance__top { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline;
               justify-content: space-between; padding-bottom: 1.1rem; border-bottom: 1px solid var(--stone-200); }
.glance__top .caps { color: var(--royale-500); }
.glance__title { font-family: var(--font-serif); font-size: 1.2rem; }
.glance__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 48rem) { .glance__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 64rem) { .glance__grid { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
.glance__item { padding: 1.1rem 1rem 1.1rem 0; }
@media (min-width: 48rem) {
  .glance__item { padding: 1.15rem 1.25rem; border-left: 1px solid var(--stone-200); }
  .glance__item:first-child { border-left: 0; padding-left: 0; }
}
.glance__label { font-family: var(--font-sans); font-size: .72rem; font-weight: 700;
                 letter-spacing: .1em; text-transform: uppercase; color: var(--ink-500);
                 margin-bottom: .45rem; }
.glance__value { font-family: var(--font-serif); font-size: 1.05rem; line-height: 1.5; }
.glance__foot { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center;
                justify-content: space-between; padding-top: 1.1rem; border-top: 1px solid var(--stone-200); }
.glance__note { font-size: .875rem; color: var(--ink-500); }

/* 课程卡 */
.course-card { position: relative; display: flex; flex-direction: column; overflow: hidden;
               border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius);
               transition: transform var(--dur) var(--ease-out), box-shadow var(--dur); }
.course-card:hover { transform: translateY(-4px); box-shadow: 0 28px 56px -30px rgba(33,35,34,.4); }
.course-card__body { display: flex; flex-direction: column; flex: 1; padding: 1.35rem 1.4rem 1.5rem; }
.course-card__meta { display: flex; flex-wrap: wrap; gap: .4rem .9rem; font-size: .8125rem;
                     color: var(--muted-foreground); }
.course-card__title { margin: .8rem 0 1rem; font-family: var(--font-serif); font-size: 1.3rem; line-height: 1.22; }
.course-card__foot { margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--border);
                     display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.course-card__price { font-size: 1.0625rem; font-weight: 700; }
.tag { display: inline-flex; align-items: center; padding: .28rem .6rem; font-size: .6875rem;
       font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
       border: 1px solid var(--border); border-radius: 999px; color: var(--muted-foreground); }
.tag--accent { border-color: var(--royale-500); color: var(--royale-500); }

/* 校园 / 路线大图卡 */
.spotlight { position: relative; display: block; overflow: hidden; min-height: 26rem; border-radius: var(--radius); }
@media (min-width: 62rem) { .spotlight { min-height: 32rem; } }
.spotlight img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
                 transition: transform 1.2s var(--ease-soft); }
.spotlight:hover img { transform: scale(1.06); }
.spotlight__body { position: relative; z-index: 1; height: 100%; display: flex;
                   flex-direction: column; justify-content: flex-end;
                   padding: clamp(1.5rem, 3vw, 2.5rem); color: #fff; }
.spotlight__label { font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
                    color: rgba(255,255,255,.78); }
.spotlight__title { margin: .6rem 0 .75rem; }

/* 师资卡 */
.faculty-card { display: flex; flex-direction: column; }
.faculty-card__media { aspect-ratio: 4 / 5; overflow: hidden; background: var(--stone-200); position: relative; }
.faculty-card__media::after { /* 悬停红色描边（覆盖层，不挤动布局） */
  content: ""; position: absolute; inset: 0; pointer-events: none; z-index: 1;
  box-shadow: inset 0 0 0 0 transparent; transition: box-shadow .3s var(--ease-out);
}
.faculty-card:hover .faculty-card__media::after { box-shadow: inset 0 0 0 3px var(--royale-500); }
.faculty-card__media img { width: 100%; height: 100%; object-fit: cover;
                           filter: grayscale(1); transition: filter .5s var(--ease-out), transform 1s var(--ease-soft); }
.faculty-card:hover .faculty-card__media img { filter: grayscale(0); transform: scale(1.04); }
.faculty-card__name { margin-top: 1.1rem; font-family: var(--font-serif); font-size: 1.25rem; }
.faculty-card__affil { margin-top: .35rem; font-size: .8125rem; font-weight: 600;
                       letter-spacing: .06em; text-transform: uppercase; color: var(--royale-500); }
.faculty-card__field { margin-top: .2rem; font-size: .8125rem; color: var(--muted-foreground); }
.faculty-card__bio { margin-top: .85rem; font-size: .875rem; line-height: 1.6; color: var(--muted-foreground); }

/* 嘉宾卡（深底横向条）*/
.speaker { display: flex; align-items: center; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--border); }
.speaker__name { font-family: var(--font-serif); font-size: 1.15rem; }
.speaker__role { font-size: .8125rem; color: var(--muted-foreground); }
.speaker__idx { font-size: .75rem; font-weight: 700; color: var(--accent); min-width: 1.75rem; }

/* 往期嘉宾：标题区两端对齐 + 六列肖像卡（参考原站版式） */
.speakers-head { display: flex; align-items: flex-end; justify-content: space-between;
                 gap: 2.5rem; flex-wrap: wrap; }
.speakers-head__note { max-width: 22rem; font-size: .9375rem; line-height: 1.6;
                       color: var(--stone-300); padding-bottom: .35rem; }
.speakers-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1.1rem;
                 margin-top: clamp(2rem, 4vw, 3rem); }
@media (max-width: 79.99rem) { .speakers-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 47.99rem) { .speakers-grid { grid-template-columns: repeat(2, 1fr); } }
.speaker-card { margin: 0; position: relative; }
.speaker-card__media { aspect-ratio: 3 / 4; overflow: hidden; background: var(--ink-900); }
.speaker-card__media img { width: 100%; height: 100%; object-fit: cover;
                           transition: transform 1s var(--ease-soft); }
.speaker-card:hover .speaker-card__media img { transform: scale(1.05); }
.speaker-card__meta { position: absolute; inset-inline: 0; bottom: 0;
                      padding: 2.4rem .95rem .95rem; pointer-events: none;
                      background: linear-gradient(to top, rgba(24,26,27,.94) 20%, rgba(24,26,27,0)); }
.speaker-card__name { font-family: var(--font-serif); font-size: 1.05rem; color: #fff; }
.speaker-card__role { margin-top: .25rem; font-size: .78rem; line-height: 1.45;
                      color: rgba(255,255,255,.78); }

/* 横向滚动容器（师资 / 故事）：JS 驱动自动滚动，无滚动条 */
.rail { overflow: hidden;
        margin-inline: calc(var(--gutter) * -1); padding-inline: var(--gutter); }
.rail__track { display: flex; gap: 1.25rem; width: max-content; will-change: transform; }
.rail__track > * { flex: 0 0 clamp(15rem, 26vw, 20rem); }
/* 降级：用户偏好减少动效时不自动滚动，退化为可拖动横向滚动（仍无滚动条） */
@media (prefers-reduced-motion: reduce) {
  .rail { overflow-x: auto; scrollbar-width: none; }
  .rail::-webkit-scrollbar { display: none; }
  .rail__track { width: auto; }
}

/* 清单（打勾列表）*/
.checklist li { display: flex; gap: .8rem; align-items: flex-start; font-size: .9375rem;
                line-height: 1.55; color: var(--muted-foreground); }
.checklist li + li { margin-top: .9rem; }
.checklist svg { flex-shrink: 0; margin-top: .2rem; color: var(--royale-500); }

/* 校友去向：两端对齐标题区 + 三列栅格（两个沙色清单面板 + 学员故事视频卡） */
.alumni-head { display: flex; align-items: flex-start; justify-content: space-between;
               gap: 2.5rem; flex-wrap: wrap; }
.alumni-head__note { max-width: 24rem; font-size: .9375rem; line-height: 1.65;
                     color: var(--muted-foreground); padding-top: .4rem; }
.alumni-grid { display: grid; grid-template-columns: 1fr 1fr 1.55fr; gap: 1.1rem;
               margin-top: clamp(2rem, 4vw, 3rem); align-items: stretch; }
@media (max-width: 63.99rem) { .alumni-grid { grid-template-columns: 1fr 1fr; }
  .story-card { grid-column: 1 / -1; min-height: 20rem; } }
@media (max-width: 47.99rem) { .alumni-grid { grid-template-columns: 1fr; } }
.dest-panel { background: var(--stone-100); padding: clamp(1.4rem, 2.5vw, 2rem); }
.dest-panel h3 { color: var(--royale-500); font-size: .8rem; letter-spacing: .1em; line-height: 1.5; }
.dest-list { list-style: none; margin: 1rem 0 0; padding: 0; }
.dest-list li { padding: .85rem 0; border-bottom: 1px solid var(--stone-300);
                font-family: var(--font-serif); font-size: .95rem; color: var(--ink-900); }
.dest-list li:first-child { padding-top: .2rem; }
.story-card { position: relative; display: block; overflow: hidden; min-height: 100%; }
.story-card > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
                    transition: transform 1.2s var(--ease-soft); }
.story-card:hover > img { transform: scale(1.04); }
.story-card__overlay { position: relative; z-index: 1; display: flex; flex-direction: column;
                       justify-content: flex-end; height: 100%; min-height: 24rem;
                       padding: clamp(1.4rem, 2.5vw, 2rem); color: #fff;
                       background: linear-gradient(to top, rgba(24,26,27,.9) 26%, rgba(24,26,27,.12)); }
.story-card__eyebrow { color: var(--gilt-400); font-size: .72rem; }
.story-card__title { font-family: var(--font-serif); font-size: clamp(1.25rem, 1.8vw, 1.55rem);
                     line-height: 1.3; margin-top: .55rem; }
.story-card__body { margin-top: .7rem; font-size: .82rem; line-height: 1.6;
                    color: rgba(255,255,255,.82); }
.story-card__cta { display: inline-flex; align-items: center; gap: .5rem; margin-top: 1.1rem;
                   font-size: .78rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
                   border-bottom: 1px solid rgba(255,255,255,.6); padding-bottom: .3rem;
                   align-self: flex-start; }
.story-card__cta svg { width: .9rem; height: .9rem; }
.alumni-foot { text-align: center; font-size: .75rem; color: var(--muted-foreground);
               margin-top: 1.6rem; }

/* 语言课程：居中标题区 + 图上文下卡片（参考原站版式） */
.lang-card__title { margin-top: 1.1rem; font-family: var(--font-serif); font-size: 1.2rem;
                    font-weight: 400; color: var(--ink-900); }
.lang-card__ages { font-size: .85em; color: var(--muted-foreground); white-space: nowrap; }
.lang-card__body { margin-top: .55rem; font-size: .875rem; line-height: 1.65;
                   color: var(--muted-foreground); }

/* ============================ 14 跑马灯 / 滚动条 ============================ */
.marquee { display: flex; overflow: hidden; gap: var(--gap, 3rem);
           -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
           mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee__track { display: flex; flex-shrink: 0; align-items: center; gap: var(--gap, 3rem);
                  animation: marquee var(--duration, 40s) linear infinite; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(calc(-100% - var(--gap, 3rem))); } }
@media (prefers-reduced-motion: reduce) { .marquee__track { animation: none; } }

/* 实时报名追踪面板 */
.tracker { background: var(--ink-900); color: #fff; border-radius: var(--radius);
           padding: clamp(1.5rem, 3vw, 2.5rem); }
.live-dot { display: inline-flex; align-items: center; gap: .5rem; font-size: .75rem;
            font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--gilt-400); }
.live-dot i { width: .5rem; height: .5rem; border-radius: 999px; background: currentColor;
              box-shadow: 0 0 0 0 currentColor; animation: pulse 2s var(--ease-out) infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(237,200,143,.6); } 70% { box-shadow: 0 0 0 .6rem rgba(237,200,143,0); } 100% { box-shadow: 0 0 0 0 rgba(237,200,143,0); } }
.enrol-row { display: flex; align-items: center; gap: .85rem; padding: .7rem 0;
             animation: swap-in .35s var(--ease-out) both; }
@keyframes swap-in { from { opacity: 0; translate: 0 .5rem; } to { opacity: 1; translate: 0 0; } }
.enrol-row__name { font-size: .9375rem; font-weight: 500; }
.enrol-row__from { font-size: .8125rem; color: rgba(255,255,255,.65); }
.enrol-row__when { margin-left: auto; font-size: .75rem; color: rgba(255,255,255,.5); }

/* 国旗色块的降级：不引入外链图片也能显示 */
.flag { width: 1.5rem; height: 1.1rem; border-radius: 2px; flex-shrink: 0; display: inline-block; }

/* ============================ 15 手风琴（FAQ）============================ */
.faq__row { border-bottom: 1px solid var(--border); }
.faq__trigger { display: flex; width: 100%; align-items: center; justify-content: space-between;
                gap: 1.5rem; padding: 1.35rem 0; text-align: left;
                font-family: var(--font-serif); font-size: clamp(1.05rem, 1.7vw, 1.35rem); line-height: 1.3; }
.faq__trigger svg { flex-shrink: 0; transition: transform .25s var(--ease-out); color: var(--accent); }
.faq__row.is-open .faq__trigger svg { transform: rotate(45deg); }
.faq__panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .32s var(--ease-out); }
.faq__panel > div { overflow: hidden; }
.faq__row.is-open .faq__panel { grid-template-rows: 1fr; }
.faq__body { padding-bottom: 1.5rem; max-width: 60ch; color: var(--muted-foreground); line-height: 1.7; }

/* ============================ 16 表单 ============================ */
.field { display: block; }
.field + .field { margin-top: 1.1rem; }
.field__label { display: block; font-size: .8125rem; font-weight: 600; margin-bottom: .45rem; }
.input, .select, .textarea {
  width: 100%; min-height: 3rem; padding: .75rem .9rem;
  background: var(--background); color: var(--foreground);
  border: 1px solid var(--border); border-radius: var(--radius);
  font: inherit; font-size: .9375rem;
  transition: border-color var(--dur), box-shadow var(--dur);
}
.textarea { min-height: 8rem; resize: vertical; }
.input:focus, .select:focus, .textarea:focus {
  outline: none; border-color: var(--ring); box-shadow: 0 0 0 3px rgba(189,15,46,.14); }
.checkbox-row { display: flex; gap: .7rem; align-items: flex-start; font-size: .875rem;
                color: var(--muted-foreground); line-height: 1.5; }
.checkbox-row input { margin-top: .25rem; width: 1.05rem; height: 1.05rem; accent-color: var(--royale-500); }
.form-note { font-size: .75rem; color: var(--muted-foreground); line-height: 1.55; }

/* 筛选标签组 */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; }
.filter-chip { padding: .5rem 1rem; min-height: 2.5rem; border: 1px solid var(--border);
               border-radius: 999px; font-size: .875rem; font-weight: 500; color: var(--muted-foreground);
               transition: all var(--dur); }
.filter-chip:hover { border-color: var(--foreground); color: var(--foreground); }
.filter-chip.is-active { background: var(--ink-900); border-color: var(--ink-900); color: #fff; }
[data-filter-item].is-hidden { display: none; }

/* ============================ 17 页脚 ============================ */
.site-footer { background: var(--ink-900); color: #fff; }
.site-footer__top { padding-block: clamp(3rem, 6vw, 5rem); }
.footer-grid { display: grid; gap: 2.5rem; grid-template-columns: 1fr; }
@media (min-width: 48rem) { .footer-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (min-width: 64rem) { .footer-grid { grid-template-columns: 1.6fr repeat(4, minmax(0,1fr)); gap: 2rem 2.5rem; } }
.footer-col__title { font-size: .75rem; font-weight: 700; letter-spacing: .1em;
                     text-transform: uppercase; color: rgba(255,255,255,.55); margin-bottom: 1rem; }
.footer-col li + li { margin-top: .55rem; }
.footer-col a { font-size: .875rem; color: rgba(255,255,255,.78); transition: color var(--dur); }
.footer-col a:hover { color: #fff; }
.site-footer .brand { color: #fff; width: 12rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); padding-block: 1.5rem;
                 display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
                 gap: 1rem; font-size: .8125rem; color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: #fff; }
.social { display: flex; gap: .5rem; }
.social a { display: inline-flex; align-items: center; justify-content: center; width: 2.5rem; height: 2.5rem;
            border: 1px solid rgba(255,255,255,.2); border-radius: 999px; transition: all var(--dur); }
.social a:hover { background: #fff; color: var(--ink-900); border-color: #fff; }

/* 底部大 CTA 区 */
.cta-band { background: var(--royale-500); color: #fff; }

/* 邮件订阅条（首页 · 深底两栏：左标题右表单）*/
.newsletter { background: var(--ink-900); color: #fff;
              padding-block: clamp(2.75rem, 5vw, 4.5rem);
              border-bottom: 1px solid rgba(255,255,255,.16); }  /* 与页脚的分界线 */
.newsletter__grid { display: grid; gap: 1.75rem 4rem; align-items: center; grid-template-columns: 1fr; }
@media (min-width: 64rem) { .newsletter__grid { grid-template-columns: 1.05fr 1fr; } }
.newsletter__title { font-family: var(--font-serif); font-weight: 500;
                     font-size: clamp(1.375rem, 2vw, 1.75rem); line-height: 1.4;
                     max-width: 36ch; }
.newsletter__title em { color: var(--gilt-400); }   /* 金色斜体：in one newsletter */
.newsletter__form { display: flex; flex-wrap: wrap; gap: .75rem; align-items: stretch; }
.newsletter__input { flex: 1 1 15rem; min-height: 2.75rem; padding: 0 1rem;
                     background: transparent; color: #fff;
                     border: 1px solid rgba(255,255,255,.4); border-radius: var(--radius);
                     font: inherit; font-size: .875rem; }
.newsletter__input::placeholder { color: rgba(255,255,255,.55); }
.newsletter__input:focus { outline: none; border-color: #fff; }
.newsletter__btn { display: inline-flex; align-items: center; justify-content: center;
                   min-height: 2.75rem; padding: .55rem 1.4rem;
                   background: var(--royale-500); color: #fff;
                   border: 1px solid var(--royale-500); border-radius: var(--radius);
                   font: inherit; font-size: .75rem; font-weight: 700;
                   letter-spacing: .08em; text-transform: uppercase;
                   cursor: pointer; white-space: nowrap;
                   transition: background-color var(--dur), border-color var(--dur); }
.newsletter__btn:hover { background: var(--royale-600); border-color: var(--royale-600); }
.newsletter__btn:disabled { opacity: .6; cursor: default; }
.newsletter__note { margin-top: .65rem; font-size: .6875rem; color: rgba(255,255,255,.6); }
.newsletter__note a { color: inherit; text-decoration: underline; }
.newsletter__note a:hover { color: #fff; }
/* 深色底上的提交状态文字（覆盖 JS 写入的内联色）*/
.newsletter [data-form-status] { color: var(--gilt-400) !important; }

/* ============================ 18 动效与滚动入场 ============================ */
[data-reveal] { opacity: 0; transform: translateY(1.75rem);
                transition: opacity .8s var(--ease-soft), transform .8s var(--ease-soft); }
[data-reveal].is-visible { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: .08s; }
[data-reveal][data-delay="2"] { transition-delay: .16s; }
[data-reveal][data-delay="3"] { transition-delay: .24s; }
[data-reveal][data-delay="4"] { transition-delay: .32s; }
[data-reveal][data-delay="5"] { transition-delay: .4s; }

/* 逐行揭幕（标题遮罩上移）*/
.reveal-line { display: block; overflow: hidden; }
.reveal-line > span { display: block; transform: translateY(105%);
                      transition: transform 1s var(--ease-soft); }
.is-visible .reveal-line > span, .reveal-line.is-visible > span { transform: none; }
[data-delay="1"] .reveal-line > span { transition-delay: .1s; }
[data-delay="2"] .reveal-line > span { transition-delay: .2s; }
[data-delay="3"] .reveal-line > span { transition-delay: .3s; }

/* 视差层：JS 写入 --py */
[data-parallax] { will-change: transform; transform: translate3d(0, var(--py, 0), 0); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important;
                           transition-duration: .001ms !important; scroll-behavior: auto !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .reveal-line > span { transform: none !important; }
}

/* ============================ 19 工具类 ============================ */
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.mt-0 { margin-top: 0; }
.mt-2 { margin-top: .5rem; } .mt-4 { margin-top: 1rem; } .mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; } .mt-12 { margin-top: 3rem; }
.mb-2 { margin-bottom: .5rem; } .mb-4 { margin-bottom: 1rem; } .mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; } .mb-12 { margin-bottom: 3rem; }
.muted { color: var(--muted-foreground); }
.accent { color: var(--accent); }
.small { font-size: .875rem; }
.tiny { font-size: .75rem; }
.nowrap { white-space: nowrap; }
.flex { display: flex; } .flex-wrap { flex-wrap: wrap; } .items-center { align-items: center; }
.items-end { align-items: flex-end; } .justify-between { justify-content: space-between; }
.gap-2 { gap: .5rem; } .gap-3 { gap: .75rem; } .gap-4 { gap: 1rem; } .gap-6 { gap: 1.5rem; }
.full { width: 100%; }
.mt-3 { margin-top: .75rem; }
/* 指标块与统计块的容器（子元素另有 __value / __label 样式）*/
.metric { display: block; }
.stat { display: block; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
                   overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
/* 响应式显隐 */
.show-md-up { display: none; }
.hide-md-up { display: inline-flex; }
.hide-lg-up { display: inline-flex; }
@media (min-width: 48rem) { .show-md-up { display: inline-flex; } .hide-md-up { display: none; } }
@media (min-width: 64rem) { .hide-lg-up { display: none; } }
.border-b { border-bottom: 1px solid var(--border); }

/* ============================ 20 响应式 ============================ */
@media (min-width: 40rem) { :root { --gutter: 2rem; } }
@media (min-width: 80rem) { :root { --gutter: 2.5rem; } }
@media (min-width: 64rem) { :root { --header-h: var(--header-h-lg); } }

@media (max-width: 61.99rem) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .mega { display: none; }          /* 平板及以下走移动端导航 */
}
@media (max-width: 39.99rem) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .hero__foot { flex-direction: column; align-items: flex-start; gap: 1.5rem; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .btn { min-height: 2.75rem; }
}
/* 打印：隐藏导航与动效 */
@media print {
  .site-header, .nav-overlay, .topbar, .scroll-cue { display: none !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  body { color: #000; }
}