/* ================================================================
   南通大学本科招生网 — Apple 风格视觉升级
   ----------------------------------------------------------------
   设计基调：
   - 浅色背景 #f5f5f7 / 纯白 #ffffff，深灰文字 #1d1d1f
   - 强调色 Apple 蓝 #0071e3，深色区段用 #000 渐变
   - 系统原生字体栈，标题字重 600-700，行高紧凑 1.1
   - 大圆角 18-28px，极柔弥散阴影
   - 间距通透，区块上下 ≥ 80px
   ================================================================ */

/* ================================================================
   Apple Design System — 完整 token 合约
   基于 Apple DS tokens.css，标准化所有色彩/字体/间距/圆角/动效
   ================================================================ */
:root{
  /* ─── Surface (3 levels) ──────────────────────────────────────── */
  --bg: #ffffff;
  --surface: #f5f5f7;
  --surface-warm: #fbfbfd;

  /* ─── Foreground ramp (4 levels) ─────────────────────────────── */
  --fg: #1d1d1f;
  --fg-2: #424245;
  --muted: #6e6e73;
  --meta: #86868b;

  /* ─── Border (2 levels) ──────────────────────────────────────── */
  --border: #d2d2d7;
  --border-soft: #e8e8ed;

  /* ─── Accent — Apple Action Blue ─────────────────────────────── */
  --accent: #0071e3;
  --accent-on: #ffffff;
  --accent-hover: #0077ed;
  --accent-active: #0066cc;

  /* ─── Semantic ───────────────────────────────────────────────── */
  --success: #16a34a;
  --warn:    #eab308;
  --danger:  #dc2626;

  /* ─── Typography ──────────────────────────────────────────────── */
  --font-display: "SF Pro Display", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body:    "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:    "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Monaco, Consolas, monospace;
  --text-xs:   12px;
  --text-sm:   14px;
  --text-base: 17px;
  --text-lg:   21px;
  --text-xl:   28px;
  --text-2xl:  40px;
  --text-3xl:  56px;
  --text-4xl:  80px;
  --leading-body:  1.47;
  --leading-tight: 1.05;
  --tracking-display: -0.015em;

  /* ─── Spacing ─────────────────────────────────────────────────── */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-12: 48px;
  --section-y-desktop: 100px;
  --section-y-tablet:  64px;
  --section-y-phone:   40px;

  /* ─── Radius — Apple 分层圆角体系 ────────────────────────────── */
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --radius-pill: 980px;

  /* ─── Elevation ───────────────────────────────────────────────── */
  --elev-flat:   none;
  --elev-ring:   0 0 0 1px var(--border);
  --elev-raised: 0 12px 32px rgba(0,0,0,0.08);
  --elev-strong: 0 20px 60px rgba(0,0,0,0.12);

  /* ─── Focus ring ──────────────────────────────────────────────── */
  --focus-ring: 0 0 0 4px color-mix(in oklab, var(--accent), transparent 65%);

  /* ─── Motion — Apple 减速缓出，绝不回弹 ──────────────────────── */
  --motion-fast:   150ms;
  --motion-base:   220ms;
  --ease-standard: cubic-bezier(0.28, 0, 0.22, 1);
  --ease-out:      cubic-bezier(0.4, 0, 0.2, 1);

  /* ─── Layout ──────────────────────────────────────────────────── */
  --container-max:            1024px;
  --container-gutter-desktop: 22px;
  --container-gutter-tablet:  18px;
  --container-gutter-phone:   16px;

  /* ─── 兼容旧变量名（保持已有代码不崩） ────────────────────────── */
  --apple-blue:       var(--accent);
  --apple-blue-hover: var(--accent-hover);
  --apple-blue-dark:  var(--accent-active);
  --apple-bg:         var(--surface);
  --apple-white:      var(--bg);
  --apple-black:      var(--fg);
  --apple-text:       var(--fg);
  --apple-text2:      var(--meta);
  --apple-text3:      var(--muted);
  --apple-border:     var(--border);
  --apple-card:       var(--bg);
  --apple-radius:     var(--radius-lg);
  --apple-radius-lg:  24px;
  --apple-radius-xl:  28px;
  --apple-shadow:       0 4px 20px rgba(0,0,0,0.04);
  --apple-shadow-hover: var(--elev-raised);
  --apple-shadow-strong:var(--elev-strong);
  --apple-ease:      var(--ease-standard);
  --apple-ease-out:  var(--ease-out);
  --apple-duration:  0.6s;
  --ff: var(--font-body), "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  /* 更深层兼容 */
  --ntu-blue:       var(--accent);
  --ntu-blue-light: #4a9eff;
  --ntu-blue-dark:  var(--accent-active);
  --text:           var(--fg);
  --text2:          var(--meta);
  --border-old:     var(--border);
  --card:           var(--bg);
  --ease:           0.3s var(--ease-standard);
}

/* ---------- Reset ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{
  scroll-behavior:smooth;
  font-size:16px;
  -webkit-text-size-adjust:100%;
}
body{
  font-family:var(--ff);
  background:var(--surface);
  color:var(--fg);
  line-height:1.5;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  letter-spacing:-0.022em;
  transition:background var(--motion-base) var(--ease-standard),color var(--motion-base) var(--ease-standard);
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}

/* ================================================================
   导航栏 — Apple 风格全宽半透明毛玻璃导航
   ================================================================ */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  padding:0 2rem;
  height:48px;
  display:flex;justify-content:space-between;align-items:center;
  background:rgba(255,255,255,0.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  transition:background 0.3s var(--apple-ease),border-color 0.3s;
  border-bottom:1px solid transparent;
}
.navbar.scrolled{
  background:rgba(255,255,255,0.8);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom-color:rgba(0,0,0,0.08);
}
.nav-logo{
  display:flex;align-items:center;gap:0.625rem;
  font-size:1.0625rem;font-weight:600;
  letter-spacing:-0.022em;
  color:var(--apple-text);
}
.nav-logo img{height:28px;width:28px;border-radius:50%;object-fit:cover}
.nav-links{
  display:flex;gap:2.25rem;list-style:none;
  align-items:center;
}
.nav-links a{
  font-size:0.8125rem;font-weight:400;
  color:var(--apple-text);
  transition:color 0.2s var(--apple-ease);
  opacity:0.88;
}
.nav-links a:hover{
  color:var(--apple-blue);
  opacity:1;
}
.nav-links a.active{
  color:var(--apple-blue);
  font-weight:500;
  opacity:1;
}
.nav-actions{display:flex;align-items:center;gap:0.5rem}
.icon-btn{
  background:none;border:none;cursor:pointer;
  padding:0.5rem;border-radius:50%;
  transition:background 0.2s;
  display:flex;align-items:center;justify-content:center;
}
.icon-btn:hover{background:rgba(0,0,0,0.05)}
.icon-btn svg{width:18px;height:18px;fill:var(--apple-text)}
.mobile-menu-btn{
  display:none;background:none;border:none;cursor:pointer;padding:0.5rem;
}
.mobile-menu-btn span{
  display:block;width:18px;height:1.5px;background:var(--apple-text);
  margin:4px 0;transition:0.3s var(--apple-ease);
  border-radius:2px;
}
.mobile-menu-btn.active span:nth-child(1){transform:rotate(45deg) translate(4px,4px)}
.mobile-menu-btn.active span:nth-child(2){opacity:0}
.mobile-menu-btn.active span:nth-child(3){transform:rotate(-45deg) translate(4px,-4px)}

/* ================================================================
   Hero 区 — 全屏轮播 + 渐变遮罩 + Apple 风格 CTA
   ================================================================ */
.hero{
  height:100vh;min-height:600px;
  position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.hero-carousel{position:absolute;inset:0}
.hero-slide{
  position:absolute;inset:0;opacity:0;
  transition:opacity 1.2s var(--apple-ease);
}
.hero-slide.active{opacity:1}
.hero-slide img{
  width:100%;height:100%;object-fit:cover;
  object-position:center;
  transform:scale(1); /* 初始不缩放 */
  transition:transform 7s var(--ease-out);
  background-color:#000;
  box-shadow:0 0 0 0.5px rgba(0,0,0,0.1);
  border:0.5px solid rgba(0,0,0,0.1);
}
.hero-slide.active img{
  transform:scale(1.08); /* Ken Burns 微缩放，7 秒慢速推进 */
}
.hero-overlay{
  position:absolute;inset:0;z-index:1;
  /* Apple 风格渐变遮罩：顶部微暗保护文字 + 底部深黑引导滚动 */
  background:linear-gradient(to bottom,
    rgba(0,0,0,0.35) 0%,
    rgba(0,0,0,0.04) 35%,
    rgba(0,0,0,0.08) 55%,
    rgba(0,0,0,0.55) 100%);
}
.hero-content{
  position:relative;z-index:2;
  text-align:center;color:#fff;
  max-width:980px;padding:0 2rem;
}
.hero-title{
  font-size:clamp(2.5rem,7vw,5.5rem);
  font-weight:700;
  letter-spacing:-0.04em;
  line-height:1.05;
  margin-bottom:1rem;
  text-shadow:0 2px 30px rgba(0,0,0,0.25);
}
.hero-subtitle{
  font-size:clamp(1.125rem,2.5vw,1.5rem);
  font-weight:400;
  letter-spacing:-0.01em;
  opacity:0.92;
  margin-bottom:2.5rem;
}
.hero-cta{
  display:inline-flex;align-items:center;gap:0.5rem;
  background:rgba(255,255,255,0.15);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.3);
  color:#fff;
  padding:0.875rem 2rem;
  border-radius:var(--radius-pill);
  font-weight:500;font-size:1.0625rem;
  letter-spacing:-0.01em;
  transition:all var(--motion-base) var(--ease-standard);
  cursor:pointer;
  position:relative;overflow:hidden;
}
.hero-cta:hover{
  background:rgba(255,255,255,0.25);
  border-color:rgba(255,255,255,0.45);
  transform:translateY(-1px);
  box-shadow:0 8px 32px rgba(0,0,0,0.15);
}
.hero-cta:active{
  transform:scale(0.97);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.hero-cta:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring),0 8px 32px rgba(0,0,0,0.15);
}
.hero-cta svg{width:16px;height:16px;fill:currentColor;transition:transform var(--motion-fast) var(--ease-standard)}
.hero-cta:hover svg{transform:translateX(2px)}
.hero-scroll{
  position:absolute;bottom:2rem;left:50%;
  transform:translateX(-50%);z-index:2;
  animation:scrollBounce 2s infinite var(--apple-ease);
  will-change:transform;
}
.hero-scroll svg{width:24px;height:24px;fill:#fff;opacity:0.6}
@keyframes scrollBounce{
  0%,100%{transform:translateX(-50%) translateY(0)}
  50%{transform:translateX(-50%) translateY(-8px)}
}

/* ================================================================
   通用区块
   ================================================================ */
section{scroll-margin-top:48px}
.section{padding:6rem 2rem;max-width:var(--max-width);margin:0 auto}
.section-header{
  text-align:center;margin-bottom:4rem;
  padding:0 2rem;
  max-width:var(--max-width);margin-left:auto;margin-right:auto;
}
.section-label{
  display:inline-block;
  font-size:0.8125rem;font-weight:600;
  color:var(--apple-blue);
  text-transform:uppercase;letter-spacing:0.08em;
  margin-bottom:0.75rem;
}
.section-title{
  font-size:clamp(2rem,5vw,3.5rem);
  font-weight:700;
  letter-spacing:-0.03em;
  line-height:1.1;
  margin-bottom:1rem;
  color:var(--apple-text);
}
.section-desc{
  font-size:1.125rem;
  color:var(--apple-text2);
  max-width:680px;margin:0 auto;
  line-height:1.5;
  font-weight:400;
}

/* ================================================================
   欢迎区 — 浅灰背景 + 大圆角图片
   ================================================================ */
.welcome{
  background:var(--surface);
  padding:var(--section-y-desktop) 0;
}
.welcome-grid{
  display:grid;grid-template-columns:1fr 1fr;
  gap:4rem;align-items:center;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.welcome-text h2{
  font-size:clamp(2rem,4vw,3rem);
  font-weight:700;
  letter-spacing:-0.03em;
  line-height:1.1;
  margin-bottom:1.5rem;
  color:var(--apple-text);
}
.welcome-text p{
  font-size:1.0625rem;
  line-height:1.6;
  color:var(--apple-text2);
  margin-bottom:1.25rem;
  letter-spacing:-0.016em;
}
.welcome-img{
  border-radius:var(--apple-radius-xl);
  overflow:hidden;
  box-shadow:var(--apple-shadow-strong);
  position:relative;
}
.welcome-img img{
  width:100%;height:420px;object-fit:cover;
  transition:transform 0.6s var(--apple-ease);
}
.welcome-img:hover img{transform:scale(1.03)}

/* ================================================================
   住在通大 — 深色背景区段
   ================================================================ */
.campus-life{
  background:var(--surface);
  color:var(--fg);
  padding:var(--section-y-desktop) 0;
}
.cl-grid{
  display:grid;grid-template-columns:1fr 1fr;
  gap:4rem;align-items:center;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.cl-text h2{
  font-size:clamp(2rem,4vw,3rem);
  font-weight:700;
  letter-spacing:-0.03em;
  line-height:1.1;
  margin-bottom:1.5rem;
}
.cl-text>p{
  font-size:1.0625rem;
  line-height:1.6;
  color:var(--apple-text2);
  margin-bottom:2rem;
}
.cl-features{
  display:grid;grid-template-columns:1fr 1fr;
  gap:1.5rem;
}
.cl-feat{display:flex;gap:0.875rem;align-items:flex-start}
.cl-feat-icon{
  width:36px;height:36px;
  background:rgba(0,0,0,0.06);
  border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;
}
.cl-feat-icon svg{width:18px;height:18px;fill:#1d1d1f}
.cl-feat h4{
  font-size:0.9375rem;font-weight:600;
  margin-bottom:0.25rem;
  letter-spacing:-0.016em;
}
.cl-feat p{
  font-size:0.8125rem;color:var(--apple-text2);line-height:1.5;
}
.cl-images{
  display:grid;grid-template-columns:1fr 1fr;
  gap:0.75rem;
}
.cl-images img{
  width:100%;height:200px;object-fit:cover;
  border-radius:var(--apple-radius);
  transition:transform 0.4s var(--apple-ease);
}
.cl-images img:hover{transform:scale(1.03)}

/* ================================================================
   校区巡礼 — 浅色背景 + 大圆角 Banner
   ================================================================ */
.campus-tour{
  padding:var(--section-y-desktop) 0;
  background:var(--surface);
}
.campus-section{margin-bottom:6rem}
.campus-banner{
  height:55vh;min-height:380px;
  position:relative;overflow:hidden;
  border-radius:var(--apple-radius-xl);
  max-width:var(--max-width);margin:0 auto;
  box-shadow:var(--apple-shadow-strong);
}
.campus-banner img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 0.8s var(--apple-ease);
}
.campus-banner:hover img{transform:scale(1.03)}
.campus-banner-overlay{
  position:absolute;inset:0;
  background:linear-gradient(to top,rgba(0,0,0,0.75) 0%,rgba(0,0,0,0.15) 60%,transparent 100%);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:3rem;
}
.campus-banner-title{
  font-size:clamp(2.25rem,5vw,3.5rem);
  font-weight:700;color:#fff;
  letter-spacing:-0.03em;line-height:1.1;
  margin-bottom:0.5rem;
}
.campus-banner-subtitle{
  font-size:1.125rem;color:rgba(255,255,255,0.85);
  line-height:1.5;max-width:700px;
}
.buildings-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1.5rem;
  max-width:var(--max-width);
  margin:2.5rem auto 0;
  padding:0 2rem;
}
.bld-card{
  background:var(--bg);
  border-radius:var(--apple-radius-lg);
  overflow:hidden;
  box-shadow:var(--apple-shadow);
  transition:transform var(--motion-base) var(--ease-standard),box-shadow var(--motion-base) var(--ease-standard);
  cursor:pointer;
  will-change:transform;
}
.bld-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--elev-raised);
}
.bld-card:active{
  transform:scale(0.98);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.bld-card:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.bld-img{height:200px;overflow:hidden}
.bld-img img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 0.6s var(--ease-standard);
}
.bld-card:hover .bld-img img{transform:scale(1.04)}
.bld-body{padding:1.5rem}
.bld-body h3{
  font-size:1.125rem;font-weight:600;
  margin-bottom:0.625rem;
  letter-spacing:-0.016em;
}
.bld-body p{
  font-size:0.875rem;line-height:1.5;
  color:var(--apple-text2);margin-bottom:1rem;
}
.bld-link{
  display:inline-flex;align-items:center;gap:0.375rem;
  color:var(--apple-blue);
  font-weight:400;font-size:0.875rem;
  transition:gap 0.2s var(--apple-ease);
}
.bld-link:hover{gap:0.625rem}
.bld-link svg{width:14px;height:14px;fill:currentColor}

/* ================================================================
   学院巡礼 — 白色卡片网格
   ================================================================ */
.college-tour{
  padding:var(--section-y-desktop) 0;
  background:var(--surface);
}
.college-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(320px,1fr));
  gap:1.5rem;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.college-card{
  background:var(--bg);
  border-radius:var(--apple-radius-lg);
  padding:2rem;
  box-shadow:var(--apple-shadow);
  transition:transform var(--motion-base) var(--ease-standard),box-shadow var(--motion-base) var(--ease-standard);
  position:relative;overflow:hidden;
  display:flex;flex-direction:column;
  will-change:transform;
}
.college-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--elev-raised);
}
.college-card:active{
  transform:scale(0.98);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.college-card-icon{
  width:48px;height:48px;
  background:var(--apple-blue);
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:1.25rem;
}
.college-card-icon svg{width:24px;height:24px;fill:#fff}
.college-card h3{
  font-size:1.25rem;font-weight:600;
  margin-bottom:0.5rem;
  letter-spacing:-0.016em;
  color:var(--apple-text);
}
.college-card .college-subtitle{
  font-size:0.8125rem;color:var(--apple-blue);
  margin-bottom:0.75rem;font-weight:500;
}
.college-card .college-desc{
  font-size:0.9375rem;line-height:1.5;
  color:var(--apple-text2);margin-bottom:1rem;
  flex:1;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.college-card .college-programs{
  display:flex;flex-wrap:wrap;gap:0.5rem;
  margin-bottom:1.25rem;
}
.college-card .college-program-tag{
  display:inline-block;
  background:rgba(0,113,227,0.08);
  color:var(--apple-blue);
  padding:0.25rem 0.75rem;
  border-radius:980px;
  font-size:0.75rem;font-weight:500;
}
.college-card-btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  background:var(--accent);color:var(--accent-on);
  padding:0.625rem 1.25rem;
  border-radius:var(--radius-pill);
  font-weight:500;font-size:0.875rem;
  letter-spacing:-0.01em;
  transition:all var(--motion-base) var(--ease-standard);
  text-decoration:none;align-self:flex-start;
  border:none;cursor:pointer;
}
.college-card-btn:hover{
  background:var(--accent-hover);
  transform:translateY(-1px);
  box-shadow:0 8px 24px rgba(0,113,227,0.25);
}
.college-card-btn:active{
  transform:scale(0.96);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.college-card-btn:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.college-card-btn svg{width:14px;height:14px;fill:currentColor;transition:transform var(--motion-fast) var(--ease-standard)}
.college-card-btn:hover svg{transform:translateX(2px)}
.loading-spinner{
  text-align:center;padding:4rem 2rem;
  color:var(--apple-text2);
}

/* ========== 专业筛选标签 ========== */
.college-filter{
  display:flex;flex-wrap:wrap;gap:0.5rem;
  justify-content:center;
  max-width:var(--max-width);margin:0 auto 2rem;padding:0 2rem;
}
.college-filter-btn{
  padding:0.5rem 1.25rem;
  border:1px solid var(--border);
  background:var(--bg);
  color:var(--fg);
  border-radius:var(--radius-pill);
  cursor:pointer;
  font-size:0.8125rem;font-weight:500;
  letter-spacing:-0.01em;
  transition:all var(--motion-base) var(--ease-standard);
  white-space:nowrap;
}
.college-filter-btn:hover{
  border-color:var(--accent);
  color:var(--accent);
  background:rgba(0,113,227,0.04);
}
.college-filter-btn:active{
  transform:scale(0.96);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.college-filter-btn:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.college-filter-btn.active{
  background:var(--accent);
  color:var(--accent-on);
  border-color:var(--accent);
}

/* ========== 专业网格 ========== */
.major-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
  gap:0.75rem;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.major-card{
  background:var(--bg);
  border-radius:var(--radius-lg);
  padding:1.25rem 1rem;
  box-shadow:var(--apple-shadow);
  transition:all var(--motion-base) var(--ease-standard);
  text-decoration:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;
  min-height:100px;
  cursor:pointer;
  border:1px solid transparent;
}
.major-card:hover{
  transform:translateY(-2px);
  box-shadow:var(--elev-raised);
  border-color:var(--accent);
}
.major-card:active{
  transform:scale(0.97);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.major-card:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.major-card-name{
  font-size:0.9375rem;font-weight:600;
  color:var(--apple-text);
  letter-spacing:-0.016em;
  line-height:1.3;
  margin-bottom:0.375rem;
}
.major-card-college{
  font-size:0.6875rem;
  color:var(--apple-text2);
  line-height:1.2;
}

/* ================================================================
   学长学姐说 — Apple 风格引用轮播 + 帖子卡片网格
   ================================================================ */
.testimonials{
  background:var(--surface);
  padding:var(--section-y-desktop) 0;overflow:hidden;
  position:relative;
}
.testimonials .section-label{color:var(--accent)}
.testimonials .section-title{color:var(--fg)}
.testimonials .section-desc{color:var(--meta)}

/* ─── 精选引用轮播 ──────────────────────────────────────────────── */
.t-quote-stage{
  position:relative;max-width:820px;margin:0 auto;padding:0 2rem;
  min-height:260px;
}
.t-quote-card{
  position:absolute;inset:0;padding:0 2rem;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;
  opacity:0;transform:translateY(12px);
  pointer-events:none;
  transition:opacity 0.5s var(--ease-standard),transform 0.5s var(--ease-standard);
}
.t-quote-card.active{
  opacity:1;transform:translateY(0);
  pointer-events:auto;
}
.t-quote-mark{
  width:40px;height:30px;fill:var(--accent);opacity:0.18;
  margin-bottom:1.25rem;flex-shrink:0;
}
.t-quote-text{
  font-size:1.375rem;font-weight:500;line-height:1.6;
  color:var(--fg);letter-spacing:-0.01em;
  max-width:640px;margin-bottom:1.5rem;
}
.t-quote-author{
  display:flex;align-items:center;gap:0.75rem;
}
.t-quote-avatar{
  width:36px;height:36px;border-radius:50%;
  background:var(--accent);color:var(--accent-on);
  display:flex;align-items:center;justify-content:center;
  font-size:0.875rem;font-weight:600;flex-shrink:0;
}
.t-quote-name{
  display:block;font-size:0.9375rem;font-weight:600;
  color:var(--fg);text-align:left;letter-spacing:-0.01em;
}
.t-quote-tag{
  display:block;font-size:0.75rem;color:var(--meta);
  text-align:left;margin-top:1px;
}

/* 轮播指示器圆点 */
.t-quote-dots{
  display:flex;justify-content:center;gap:0.5rem;
  margin-top:1.75rem;position:relative;z-index:1;
}
.t-dot{
  width:8px;height:8px;border-radius:50%;border:none;
  background:var(--border);cursor:pointer;padding:0;
  transition:all var(--motion-base) var(--ease-standard);
}
.t-dot:hover{background:var(--meta)}
.t-dot.active{background:var(--accent);width:24px;border-radius:4px;}

/* ─── 来源标注 ───────────────────────────────────────────────── */
.testimonials-source{
  text-align:center;margin-top:1.5rem;padding:0 2rem;
  max-width:var(--max-width);margin-left:auto;margin-right:auto;
}
.testimonials-source p{
  font-size:0.8125rem;color:var(--muted);
}

/* ─── 帖子区 ──────────────────────────────────────────────────── */
.testimonials-posts{
  text-align:center;margin-top:2.5rem;padding:0 2rem;
  max-width:var(--max-width);margin-left:auto;margin-right:auto;
}
.posts-toggle-btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  padding:0.75rem 1.75rem;
  background:var(--bg);
  color:var(--accent);
  border:1px solid var(--accent);
  border-radius:var(--radius-pill);
  font-size:0.9375rem;font-weight:500;letter-spacing:-0.01em;
  cursor:pointer;
  transition:all var(--motion-base) var(--ease-standard);
}
.posts-toggle-btn:hover{
  background:var(--accent);
  color:var(--accent-on);
  box-shadow:0 8px 24px rgba(0,113,227,0.2);
}
.posts-toggle-btn:active{transform:scale(0.96)}
.posts-toggle-btn svg{transition:transform var(--motion-fast) var(--ease-standard)}
.posts-toggle-btn.active svg{transform:rotate(180deg)}

/* 帖子网格容器 */
.posts-list{
  overflow:hidden;
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows 0.5s var(--ease-standard);
  margin-top:1.5rem;
}
.posts-list.show{grid-template-rows:1fr}
.posts-list>.posts-grid{min-height:0}

/* 帖子卡片 */
.posts-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:1rem;padding-bottom:0.5rem;
}
.t-post-card{
  display:flex;flex-direction:column;gap:0.625rem;
  background:var(--surface);
  border-radius:var(--radius-lg);
  padding:1.5rem;
  text-decoration:none;text-align:left;
  border:1px solid transparent;
  box-shadow:var(--apple-shadow);
  transition:all var(--motion-base) var(--ease-standard);
  cursor:pointer;
}
.t-post-card:hover{
  border-color:var(--accent);
  box-shadow:var(--elev-raised);
  transform:translateY(-2px);
}
.t-post-card:active{transform:scale(0.98)}
.t-post-tag{
  display:inline-block;align-self:flex-start;
  padding:0.2rem 0.75rem;
  background:rgba(0,113,227,0.08);
  color:var(--accent);border-radius:var(--radius-pill);
  font-size:0.6875rem;font-weight:600;letter-spacing:0.02em;
  text-transform:uppercase;
}
.t-post-title{
  font-size:0.9375rem;font-weight:600;color:var(--fg);
  line-height:1.45;letter-spacing:-0.01em;
  flex:1;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;
}
.t-post-meta{
  font-size:0.75rem;color:var(--meta);
  display:flex;align-items:center;gap:0.375rem;
}
.t-post-meta::before{
  content:'';display:inline-block;width:6px;height:6px;
  background:var(--accent);border-radius:50%;opacity:0.5;
}

/* ─── 深色模式 ──────────────────────────────────────────────────── */
body.dark .testimonials{background:var(--surface)}
body.dark .t-quote-text{color:var(--fg)}
body.dark .t-quote-name{color:var(--fg)}
body.dark .t-quote-tag{color:var(--meta)}
body.dark .t-quote-mark{fill:var(--accent);opacity:0.25}
body.dark .t-post-card{background:var(--surface);border-color:var(--border-soft)}
body.dark .t-post-card:hover{border-color:var(--accent)}
body.dark .posts-toggle-btn{background:var(--bg);border-color:var(--accent);color:var(--accent)}
body.dark .posts-toggle-btn:hover{background:var(--accent);color:var(--accent-on)}

/* ================================================================
   活力校园 — 深色背景 + 玻璃卡片
   ================================================================ */
.student-life{
  background:var(--surface);
  color:var(--fg);
  padding:var(--section-y-desktop) 0;
}
.sl-header{text-align:center;margin-bottom:4rem;padding:0 1rem}
.sl-header h2{
  font-size:clamp(2rem,5vw,3.5rem);
  font-weight:700;
  letter-spacing:-0.03em;line-height:1.1;
  margin-bottom:1rem;
}
.sl-header p{
  font-size:1.125rem;color:var(--apple-text2);
  max-width:680px;margin:0 auto;
  line-height:1.5;
}
.sl-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:1.5rem;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.sl-card{
  display:block;
  background:rgba(0,0,0,0.04);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-radius:var(--apple-radius-lg);
  padding:2rem;
  border:1px solid rgba(0,0,0,0.08);
  transition:all var(--motion-base) var(--ease-standard);
  color:inherit;text-decoration:none;
  cursor:pointer;
}
.sl-card:hover{
  background:rgba(0,0,0,0.08);
  transform:translateY(-3px);
  box-shadow:var(--elev-raised);
}
.sl-card:active{
  transform:scale(0.97);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.sl-card:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.sl-card-icon{
  width:48px;height:48px;
  background:rgba(0,0,0,0.08);
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:1.25rem;
}
.sl-card-icon svg{width:22px;height:22px;fill:#1d1d1f}
.sl-card h3{
  font-size:1.125rem;font-weight:600;
  margin-bottom:0.75rem;
  letter-spacing:-0.016em;
  color:var(--apple-text);
}
.sl-card p{
  font-size:0.875rem;line-height:1.5;color:var(--apple-text2);
}

/* ================================================================
   入学指南 — Apple 时间线步骤
   ================================================================ */
.guide{
  padding:var(--section-y-desktop) 0;
  background:var(--surface);
}
/* 时间线容器 */
.guide-timeline{
  max-width:820px;margin:0 auto;padding:0 2rem;
  position:relative;
}
/* 每一步 */
.g-step{
  display:flex;gap:2rem;position:relative;
  padding-bottom:3rem;
}
.g-step:last-child{padding-bottom:0}

/* 左侧：步骤编号 + 连接线 */
.g-step-marker{
  display:flex;flex-direction:column;align-items:center;
  flex-shrink:0;width:48px;
}
.g-step-num{
  width:44px;height:44px;border-radius:50%;
  background:var(--accent);color:var(--accent-on);
  display:flex;align-items:center;justify-content:center;
  font-size:0.8125rem;font-weight:700;
  font-family:var(--font-mono);letter-spacing:0.04em;
  flex-shrink:0;z-index:1;
  box-shadow:0 4px 16px rgba(0,113,227,0.25);
}
.g-step-line{
  width:2px;flex:1;min-height:3rem;
  background:linear-gradient(to bottom,var(--accent),var(--border));
  margin-top:0.5rem;border-radius:1px;
}

/* 右侧：卡片 */
.g-step-card{
  flex:1;display:flex;gap:1.25rem;
  background:var(--surface);
  border-radius:var(--apple-radius-lg);
  padding:1.75rem 2rem 1.75rem 1.75rem;
  box-shadow:var(--apple-shadow);
  border:1px solid var(--border-soft);
  transition:all var(--motion-base) var(--ease-standard);
}
.g-step-card:hover{
  box-shadow:var(--elev-raised);
  border-color:var(--border);
  transform:translateY(-2px);
}

/* 图标圆形容器 */
.g-step-icon{
  width:52px;height:52px;border-radius:14px;
  background:rgba(0,113,227,0.08);
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;
}
.g-step-icon svg{width:24px;height:24px;fill:var(--accent)}

/* 卡片正文 */
.g-step-body{flex:1}
.g-step-tag{
  display:inline-block;font-size:0.6875rem;font-weight:600;
  color:var(--accent);text-transform:uppercase;letter-spacing:0.06em;
  margin-bottom:0.375rem;
}
.g-step-body h3{
  font-size:1.25rem;font-weight:600;color:var(--fg);
  margin-bottom:0.5rem;letter-spacing:-0.016em;line-height:1.2;
}
.g-step-body p{
  font-size:0.9375rem;line-height:1.55;color:var(--meta);
  margin-bottom:1rem;max-width:52ch;
}

/* 步骤 CTA 链接 */
.g-step-link{
  display:inline-flex;align-items:center;gap:0.375rem;
  font-size:0.875rem;font-weight:500;color:var(--accent);
  transition:all var(--motion-base) var(--ease-standard);
  padding:0.375rem 0;
}
.g-step-link:hover{color:var(--accent-hover)}
.g-step-link:hover svg{transform:translateX(2px)}
.g-step-link svg{
  width:14px;height:14px;fill:currentColor;
  transition:transform var(--motion-fast) var(--ease-standard);
}
.g-step-link:active{transform:scale(0.97)}

/* ─── 深色模式 ───────────────────────────────────── */
body.dark .guide{background:var(--bg)}
body.dark .g-step-card{
  background:var(--surface);
  border-color:var(--border-soft);
}
body.dark .g-step-card:hover{border-color:var(--border)}
body.dark .g-step-icon{background:rgba(41,151,255,0.12)}
body.dark .g-step-icon svg{fill:var(--accent)}
body.dark .g-step-body h3{color:var(--fg)}
body.dark .g-step-body p{color:var(--meta)}
body.dark .g-step-line{background:linear-gradient(to bottom,var(--accent),var(--border))}

/* ─── 移动端 ─────────────────────────────────────── */
@media(max-width:734px){
  .g-step{gap:1rem;padding-bottom:2rem}
  .g-step-marker{width:36px}
  .g-step-num{width:36px;height:36px;font-size:0.75rem}
  .g-step-card{flex-direction:column;gap:1rem;padding:1.5rem}
  .g-step-icon{width:44px;height:44px;border-radius:12px}
  .g-step-icon svg{width:20px;height:20px}
  .g-step-body h3{font-size:1.125rem}
}

/* ================================================================
   预估分数线区段 — 深色渐变背景 + 白色表格卡片
   ================================================================ */
.estimated-scores{
  padding:var(--section-y-desktop) 0;
  background:var(--surface);
  color:var(--fg);
}
.estimated-scores .section-label{color:var(--apple-blue)}
.estimated-scores h2{color:var(--apple-text)}

/* ================================================================
   页脚 — Apple 风格浅灰背景 + 多列链接
   ================================================================ */
.footer{
  background:var(--surface);
  color:var(--muted);
  padding:4rem 0 2rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:3rem;
  max-width:var(--max-width);margin:0 auto;padding:0 2rem;
}
.footer-brand{margin-bottom:2rem}
.footer-logo{
  display:flex;align-items:center;gap:0.75rem;
  margin-bottom:1.25rem;
  font-size:1.125rem;font-weight:600;
  color:var(--apple-text);
}
.footer-logo img{height:32px;border-radius:50%;object-fit:cover}
.footer-brand p{
  font-size:0.8125rem;line-height:1.6;
  color:var(--apple-text3);margin-bottom:1.25rem;
  max-width:360px;
}
.footer-social{display:flex;gap:0.625rem}
.footer-social a{
  width:32px;height:32px;border-radius:50%;
  background:rgba(0,0,0,0.05);
  display:flex;align-items:center;justify-content:center;
  transition:all 0.2s var(--apple-ease);
}
.footer-social a:hover{
  background:var(--apple-blue);
  transform:translateY(-1px);
}
.footer-social svg{width:15px;height:15px;fill:var(--apple-text3)}
.footer-social a:hover svg{fill:#fff}
.footer-links h4{
  font-size:0.8125rem;font-weight:600;
  margin-bottom:1rem;
  color:var(--apple-text);
  letter-spacing:-0.016em;
}
.footer-links ul{list-style:none}
.footer-links li{margin-bottom:0.625rem}
.footer-links a{
  font-size:0.75rem;
  color:var(--apple-text3);
  transition:color 0.2s;
}
.footer-links a:hover{color:var(--apple-text)}
.footer-bottom{
  max-width:var(--max-width);margin:3rem auto 0;
  padding:1.5rem 2rem 0;
  border-top:1px solid var(--apple-border);
  display:flex;justify-content:space-between;align-items:center;
  font-size:0.75rem;color:var(--apple-text3);
}

/* ================================================================
   深色模式 — 基于 Apple 深色表面体系
   ================================================================ */
body.dark{
  --bg: #000000;
  --surface: #1c1c1e;
  --surface-warm: #1c1c1e;
  --fg: #f5f5f7;
  --fg-2: #a1a1a6;
  --muted: #98989d;
  --meta: #86868b;
  --border: #38383a;
  --border-soft: #2c2c2e;
  --accent: #2997ff; /* 深色模式用高亮蓝 */
  --accent-hover: #40a9ff;
  --accent-active: #0071e3;
  /* 兼容旧变量 */
  --apple-bg: #000000;
  --apple-white: #1c1c1e;
  --apple-text: #f5f5f7;
  --apple-text2: #a1a1a6;
  --apple-text3: #86868b;
  --apple-border: #38383a;
  --apple-card: #1c1c1e;
  --apple-shadow: 0 4px 20px rgba(0,0,0,0.25);
  --apple-shadow-hover: 0 12px 40px rgba(0,0,0,0.4);
  --apple-shadow-strong: 0 20px 60px rgba(0,0,0,0.5);
}
body.dark .navbar{
  background:rgba(0,0,0,0.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
}
body.dark .navbar.scrolled{
  background:rgba(0,0,0,0.85);
  border-bottom-color:var(--border);
}
body.dark .welcome{background:var(--surface)}
body.dark .campus-tour{background:var(--surface)}
body.dark .college-tour{background:var(--surface)}
body.dark .guide{background:var(--surface)}
body.dark .student-life{background:var(--surface);color:var(--fg)}
body.dark .testimonials{background:var(--surface)}
body.dark .estimated-scores{background:var(--surface);color:var(--fg)}
body.dark .footer{background:var(--surface)}
body.dark .icon-btn:hover{background:rgba(255,255,255,0.1)}
body.dark .nav-logo{color:var(--fg)}
body.dark .nav-links a{color:var(--fg)}
body.dark .footer-social a{background:rgba(255,255,255,0.08)}
body.dark .footer-social svg{fill:var(--muted)}
body.dark .section-title{color:var(--fg)}
body.dark .section-desc{color:var(--meta)}
body.dark .welcome-text h2{color:var(--fg)}
body.dark .welcome-text p{color:var(--meta)}
body.dark .cl-text h2{color:var(--fg)}
body.dark .cl-text>p{color:var(--meta)}
body.dark .cl-feat-icon{background:rgba(255,255,255,0.1)}
body.dark .cl-feat-icon svg{fill:var(--fg)}
body.dark .cl-feat p{color:var(--meta)}
body.dark .sl-header h2{color:var(--fg)}
body.dark .sl-header p{color:var(--meta)}
body.dark .sl-card{background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.08)}
body.dark .sl-card:hover{background:rgba(255,255,255,0.1)}
body.dark .sl-card-icon{background:rgba(255,255,255,0.1)}
body.dark .sl-card-icon svg{fill:var(--fg)}
body.dark .sl-card h3{color:var(--fg)}
body.dark .sl-card p{color:var(--meta)}
body.dark .hero-overlay{background:linear-gradient(to bottom,rgba(0,0,0,0.5) 0%,rgba(0,0,0,0.08) 35%,rgba(0,0,0,0.12) 55%,rgba(0,0,0,0.7) 100%)}

/* ================================================================
   滚动渐显动画 — Apple 风格淡入上移（提速 + 交错）
   ================================================================ */
.reveal{
  opacity:0;
  transform:translateY(30px);
  transition:opacity 0.6s var(--ease-standard),transform 0.6s var(--ease-standard);
  will-change:opacity,transform;
}
.reveal.visible{
  opacity:1;
  transform:translateY(0);
  will-change:auto;
}
.reveal-left{
  opacity:0;
  transform:translateX(-30px);
  transition:opacity 0.6s var(--ease-standard),transform 0.6s var(--ease-standard);
  will-change:opacity,transform;
}
.reveal-left.visible{
  opacity:1;
  transform:translateX(0);
  will-change:auto;
}
.reveal-right{
  opacity:0;
  transform:translateX(30px);
  transition:opacity 0.6s var(--ease-standard),transform 0.6s var(--ease-standard);
  will-change:opacity,transform;
}
.reveal-right.visible{
  opacity:1;
  transform:translateX(0);
  will-change:auto;
}

/* ─── 网格子元素交错渐显 ────────────────────────────────────────── */
.college-grid .college-card:nth-child(1),
.buildings-grid .bld-card:nth-child(1),
.guide-grid .guide-card:nth-child(1),
.sl-grid .sl-card:nth-child(1),
.major-grid .major-card:nth-child(1) { transition-delay: 0s; }
.college-grid .college-card:nth-child(2),
.buildings-grid .bld-card:nth-child(2),
.guide-grid .guide-card:nth-child(2),
.sl-grid .sl-card:nth-child(2),
.major-grid .major-card:nth-child(2) { transition-delay: 0.06s; }
.college-grid .college-card:nth-child(3),
.buildings-grid .bld-card:nth-child(3),
.guide-grid .guide-card:nth-child(3),
.sl-grid .sl-card:nth-child(3),
.major-grid .major-card:nth-child(3) { transition-delay: 0.12s; }
.college-grid .college-card:nth-child(4),
.buildings-grid .bld-card:nth-child(4),
.guide-grid .guide-card:nth-child(4),
.sl-grid .sl-card:nth-child(4),
.major-grid .major-card:nth-child(4) { transition-delay: 0.18s; }
.college-grid .college-card:nth-child(5),
.buildings-grid .bld-card:nth-child(5),
.guide-grid .guide-card:nth-child(5),
.sl-grid .sl-card:nth-child(5),
.major-grid .major-card:nth-child(5) { transition-delay: 0.24s; }
.college-grid .college-card:nth-child(6),
.buildings-grid .bld-card:nth-child(6),
.guide-grid .guide-card:nth-child(6),
.sl-grid .sl-card:nth-child(6),
.major-grid .major-card:nth-child(6) { transition-delay: 0.30s; }
.college-grid .college-card:nth-child(7),
.buildings-grid .bld-card:nth-child(7),
.guide-grid .guide-card:nth-child(7),
.major-grid .major-card:nth-child(7) { transition-delay: 0.36s; }
.college-grid .college-card:nth-child(8),
.buildings-grid .bld-card:nth-child(8),
.guide-grid .guide-card:nth-child(8),
.major-grid .major-card:nth-child(8) { transition-delay: 0.42s; }

/* ================================================================
   图片模态框
   ================================================================ */
.modal-overlay{
  position:fixed;inset:0;
  background:rgba(0,0,0,0.85);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  z-index:2000;
  display:none;align-items:center;justify-content:center;
  opacity:0;
  transition:opacity 0.4s var(--apple-ease);
  will-change:opacity;
}
.modal-overlay.active{display:flex;opacity:1}
.modal-content{
  max-width:900px;max-height:90vh;
  position:relative;
}
.modal-content img{
  max-width:100%;max-height:85vh;
  border-radius:var(--apple-radius-lg);
  object-fit:contain;
}
.modal-close{
  position:absolute;top:-44px;right:0;
  background:none;border:none;cursor:pointer;
}
.modal-close svg{width:28px;height:28px;fill:#fff;opacity:0.8;transition:opacity 0.2s}
.modal-close:hover svg{opacity:1}
.modal-caption{
  text-align:center;color:#fff;
  margin-top:1rem;font-size:0.9375rem;
  opacity:0.8;
}

/* ================================================================
   响应式 — Apple 官网断点习惯
   ================================================================ */
@media(max-width:1068px){
  .nav-links{gap:1.75rem}
  .section-title,.hero-title{letter-spacing:-0.025em}
}
@media(max-width:1024px){
  .welcome-grid,.cl-grid{grid-template-columns:1fr;gap:3rem}
  .welcome-img{order:-1}
  .welcome-img img{height:340px}
  .cl-images{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
}
@media(max-width:734px){
  .navbar{padding:0 1rem;height:44px}
  .nav-links{
    display:none;position:fixed;inset:0;
    background:rgba(255,255,255,0.97);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    flex-direction:column;align-items:center;justify-content:center;
    gap:2rem;z-index:999;
  }
  body.dark .nav-links{background:rgba(0,0,0,0.97)}
  .nav-links.active{display:flex}
  .nav-links a{font-size:1.25rem;font-weight:600}
  .mobile-menu-btn{display:block;z-index:1001}
  .section{padding:var(--section-y-phone) 1.25rem}
  .section-header{margin-bottom:3rem}
  .welcome{padding:var(--section-y-phone) 0}
  .welcome-grid{padding:0 1.25rem;gap:2rem}
  .campus-life{padding:var(--section-y-phone) 0}
  .cl-grid{padding:0 1.25rem;gap:2rem}
  .cl-features{grid-template-columns:1fr}
  .campus-tour{padding:var(--section-y-phone) 0}
  .campus-banner{
    height:40vh;min-height:280px;
    border-radius:var(--apple-radius);
  }
  .campus-banner-overlay{padding:2rem}
  .buildings-grid{padding:0 1rem}
  .college-tour{padding:var(--section-y-phone) 0}
  .college-grid{padding:0 1rem;grid-template-columns:1fr}
  .college-filter{padding:0 1rem}
  .college-filter-btn{padding:0.375rem 0.875rem;font-size:0.75rem}
  .major-grid{padding:0 1rem;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:0.5rem}
  .major-card{padding:1rem 0.75rem;min-height:80px}
  .major-card-name{font-size:0.8125rem}
  .major-card-college{font-size:0.625rem}
  .testimonials{padding:var(--section-y-phone) 0}
  .t-quote-text{font-size:1.125rem}
  .t-quote-stage{min-height:220px}
  .student-life{padding:var(--section-y-phone) 0}
  .sl-grid{padding:0 1rem}
  .guide{padding:var(--section-y-phone) 0}
  .footer-grid{grid-template-columns:1fr;gap:2rem;padding:0 1.25rem}
  .footer-bottom{flex-direction:column;gap:0.75rem;text-align:center;padding:1.5rem 1.25rem 0}

  /* ===== 移动端性能优化：禁用高耗GPU效果 ===== */


  /* 降低 will-change 开销：仅在需要时使用 */
  .reveal,.reveal-left,.reveal-right{
    will-change:auto;
  }
  .reveal.visible,.reveal-left.visible,.reveal-right.visible{
    will-change:auto;
  }

  /* 降低 hero 区域 backdrop-filter 负载 */
  .hero-cta{
    backdrop-filter:none;
    -webkit-backdrop-filter:none;
    background:rgba(255,255,255,0.25);
  }

  /* 减少 bld-card 的阴影和动画 */
  .bld-card{
    box-shadow:0 2px 8px rgba(0,0,0,0.06);
    will-change:auto;
  }

  /* 减少 campus-banner 的高度以降低GPU纹理尺寸 */
  .campus-banner{
    height:35vh;
    min-height:220px;
  }

  /* 帖子卡片移动端单列 */
  .posts-grid{grid-template-columns:1fr}

  /* 活力校园卡片禁用 backdrop-filter */
  .sl-card{
    backdrop-filter:none;
    -webkit-backdrop-filter:none;
    background:rgba(0,0,0,0.06);
  }

  /* 确保滚动动画不会因GPU问题卡住 */
  .campus-tour .campus-section,
  .college-tour,
  .testimonials,
  .student-life,
  .guide,
  .estimated-scores{
    transform:none !important;
    opacity:1 !important;
    will-change:auto;
  }
}
@media(max-width:480px){
  .hero-title{font-size:2.25rem}
  .hero-subtitle{font-size:1rem}
  .hero-cta{padding:0.75rem 1.5rem;font-size:0.9375rem}
  .welcome-img img{height:260px}
  .cl-images img{height:160px}
}

/* ================================================================
   兼容旧类名（college-card / map 等已在上方定义，此处补充）
   ================================================================ */
.colleges{
  background:var(--apple-bg);
  padding:6rem 2rem;
}

/* CAMPUS MAP */
.map-selector{
  display:flex;justify-content:center;gap:0.75rem;
  margin-bottom:2rem;flex-wrap:wrap;
}
.map-tab{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius-pill);
  padding:0.625rem 1.5rem;
  font-size:0.9375rem;font-weight:500;
  color:var(--fg);cursor:pointer;
  letter-spacing:-0.01em;
  transition:all var(--motion-base) var(--ease-standard);
}
.map-tab:hover{
  border-color:var(--accent);
  color:var(--accent);
  background:rgba(0,113,227,0.04);
}
.map-tab:active{
  transform:scale(0.96);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.map-tab:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.map-tab.active{
  background:var(--accent);
  border-color:var(--accent);
  color:var(--accent-on);
}
.map-campus-info{max-width:600px;margin:0 auto 2rem}
.map-info-card{
  display:none;text-align:center;
  padding:1.5rem;
  background:var(--apple-card);
  border-radius:var(--apple-radius);
  border:1px solid var(--apple-border);
}
.map-info-card.active{display:block}
.map-info-card h3{
  font-size:1.375rem;font-weight:600;
  margin-bottom:0.5rem;color:var(--apple-blue);
}
.map-info-card p{
  font-size:0.9375rem;color:var(--apple-text2);
  margin-bottom:0.75rem;
}
.map-info-tag{
  display:inline-block;
  background:rgba(0,113,227,0.1);
  color:var(--apple-blue);
  padding:0.375rem 1rem;
  border-radius:980px;
  font-size:0.8125rem;font-weight:500;
}
.map-container{
  position:relative;max-width:1000px;margin:0 auto;
  border-radius:var(--apple-radius-lg);
  overflow:hidden;
  box-shadow:var(--apple-shadow-strong);
}
.map-iframe{
  display:none;width:100%;height:500px;border:0;
  border-radius:var(--apple-radius-lg);
}
.map-iframe.active{display:block}
.map-downloads{max-width:600px;margin:2rem auto 0;text-align:center}
.map-downloads h4{
  font-size:1.125rem;font-weight:600;
  margin-bottom:1rem;color:var(--apple-text);
}
.map-download-links{
  display:flex;justify-content:center;gap:1rem;flex-wrap:wrap;
}
.map-download-btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  background:var(--apple-blue);color:#fff;
  padding:0.75rem 1.5rem;
  border-radius:980px;
  font-size:0.9375rem;font-weight:400;
  transition:all 0.3s var(--apple-ease);
  text-decoration:none;
}
.map-download-btn:hover{
  background:var(--apple-blue-hover);
  transform:translateY(-1px);
}
.map-download-btn svg{fill:currentColor}

@media(max-width:734px){
  .map-selector{gap:0.5rem}
  .map-tab{padding:0.5rem 1.25rem;font-size:0.875rem}
  .map-iframe{height:350px}
  .map-info-card{padding:1rem}
  .map-info-card h3{font-size:1.25rem}
}

/* ================================================================
   通用 Apple 风格按钮类（供内联样式替换使用）
   ================================================================ */
.apple-btn{
  display:inline-flex;align-items:center;gap:0.4rem;
  padding:0.75rem 1.75rem;
  background:var(--accent);
  color:var(--accent-on);
  border-radius:var(--radius-pill);
  font-weight:500;font-size:0.9375rem;
  letter-spacing:-0.01em;
  text-decoration:none;
  border:none;cursor:pointer;
  transition:all var(--motion-base) var(--ease-standard);
}
.apple-btn:hover{
  background:var(--accent-hover);
  transform:translateY(-1px);
  box-shadow:0 8px 24px rgba(0,113,227,0.25);
}
.apple-btn:active{
  transform:scale(0.96);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.apple-btn:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}
.apple-btn svg{width:16px;height:16px;fill:currentColor;transition:transform var(--motion-fast) var(--ease-standard)}
.apple-btn:hover svg{transform:translateX(2px)}

.apple-btn-secondary{
  display:inline-flex;align-items:center;gap:0.4rem;
  padding:0.75rem 1.75rem;
  background:transparent;
  color:var(--accent);
  border:1px solid var(--accent);
  border-radius:var(--radius-pill);
  font-weight:500;font-size:0.9375rem;
  letter-spacing:-0.01em;
  text-decoration:none;cursor:pointer;
  transition:all var(--motion-base) var(--ease-standard);
}
.apple-btn-secondary:hover{
  background:var(--accent);
  color:var(--accent-on);
  box-shadow:0 8px 24px rgba(0,113,227,0.2);
}
.apple-btn-secondary:active{
  transform:scale(0.96);
  transition:transform var(--motion-fast) var(--ease-standard);
}
.apple-btn-secondary:focus-visible{
  outline:none;
  box-shadow:var(--focus-ring);
}

/* 通用 section-more-btn Apple 风格覆盖（清除旧内联样式残留） */
.section-more-btn{
  display:inline-flex !important;
  align-items:center !important;
  gap:0.4rem !important;
  margin-top:1.5rem !important;
  padding:0.75rem 1.75rem !important;
  background:var(--accent) !important;
  color:var(--accent-on) !important;
  border-radius:var(--radius-pill) !important;
  text-decoration:none !important;
  font-weight:500 !important;
  font-size:0.9375rem !important;
  letter-spacing:-0.01em !important;
  transition:all var(--motion-base) var(--ease-standard) !important;
  border:none !important;
  cursor:pointer;
}
.section-more-btn:hover{
  background:var(--accent-hover) !important;
  transform:translateY(-1px) !important;
  box-shadow:0 8px 24px rgba(0,113,227,0.3) !important;
}
.section-more-btn:active{
  transform:scale(0.96) !important;
  transition:transform var(--motion-fast) var(--ease-standard) !important;
}
.section-more-btn:focus-visible{
  outline:none !important;
  box-shadow:var(--focus-ring) !important;
}
.section-more-btn svg{width:16px;height:16px;fill:currentColor;transition:transform var(--motion-fast) var(--ease-standard)}
.section-more-btn:hover svg{transform:translateX(2px)}