/* ========================================
   wcuu.cn — Apple-style Design
   苹果官网风格个人主页
   ======================================== */

/* ---------- CSS 变量 / 主题 ---------- */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-hero: #000000;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --text-bright: #f5f5f7;
  --text-bright-muted: #86868b;
  --primary: #0071e3;
  --primary-light: #2997ff;
  --primary-dark: #0077ed;
  --accent: #5b5fc7;
  --border: #d2d2d7;
  --card: #ffffff;
  --card-hover: #f5f5f7;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.04);
  --shadow-md: 0 8px 30px rgba(0,0,0,.08);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.12);
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 24px;
  --radius-pill: 980px;
  --max-width: 980px;
  --max-width-wide: 1200px;
  --transition: .4s cubic-bezier(.28,.11,.24,1);
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "PingFang SC", "Helvetica Neue", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", monospace;
}

[data-theme="dark"] {
  --bg: #000000;
  --bg-alt: #1d1d1f;
  --bg-hero: #000000;
  --text: #f5f5f7;
  --text-muted: #86868b;
  --text-bright: #f5f5f7;
  --text-bright-muted: #86868b;
  --primary: #2997ff;
  --primary-light: #5ac8fa;
  --primary-dark: #0077ed;
  --accent: #5b5fc7;
  --border: #424245;
  --card: #1d1d1f;
  --card-hover: #2d2d2f;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.3);
  --shadow-md: 0 8px 30px rgba(0,0,0,.4);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.5);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  font-size: 17px;
  letter-spacing: -.01em;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); text-decoration: underline; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ---------- 布局工具 ---------- */
.container { max-width: var(--max-width-wide); margin: 0 auto; padding: 0 22px; }

.section { padding: 90px 0; position: relative; }
.section-alt { background: var(--bg-alt); }

.section-header { text-align: center; margin-bottom: 56px; }
.section-header-row { display: flex; justify-content: space-between; align-items: flex-end; text-align: left; }

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--primary);
  background: rgba(0,113,227,.08);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.03em;
  line-height: 1.1;
}

/* ---------- 按钮（苹果胶囊风格） ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  font-size: 1.02rem;
  font-weight: 400;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  letter-spacing: -.01em;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.btn-text { color: var(--primary); padding: 6px 0; font-weight: 400; font-size: 1.05rem; }
.btn-text:hover { color: var(--primary-light); }
.btn-text::after { content: ' \203A'; }
.btn-text:hover { text-decoration: none; }
.btn-full { width: 100%; }

/* ---------- 导航栏（苹果半透明黑底） ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(0,0,0,.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: background var(--transition);
}

.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 44px; max-width: var(--max-width-wide); }

.nav-logo { display: flex; align-items: center; gap: 8px; }
.logo-text { font-size: 1.05rem; font-weight: 600; color: #f5f5f7; letter-spacing: -.02em; }
.logo-sub { font-family: var(--font-mono); font-size: .62rem; color: #86868b; }

.nav-menu { display: flex; gap: 0; }
.nav-link {
  color: #f5f5f7;
  font-size: .78rem;
  font-weight: 400;
  padding: 0 10px;
  border-radius: 0;
  transition: color var(--transition);
  position: relative;
  opacity: .85;
}
.nav-link:hover { color: #fff; opacity: 1; background: transparent; text-decoration: none; }
.nav-link.active { color: #fff; opacity: 1; }
.nav-link.active::after { display: none; }

.nav-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
  background: none; border: none; cursor: pointer;
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #86868b; transition: color var(--transition);
}
.theme-toggle:hover { color: #f5f5f7; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.nav-burger { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.nav-burger span { width: 18px; height: 1px; background: #f5f5f7; border-radius: 0; transition: all var(--transition); }
.nav-burger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-burger.active span:nth-child(2) { opacity: 0; }
.nav-burger.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero（苹果全屏黑底大标题） ---------- */
.hero {
  min-height: 92vh; display: flex; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden;
  padding-top: 44px;
  background: var(--bg-hero);
}

.hero-bg { display: none; }

.hero-content { position: relative; z-index: 1; max-width: 860px; padding: 0 22px; }
.hero-greeting { color: var(--text-bright-muted); font-size: 1.3rem; font-weight: 400; margin-bottom: 6px; }
.hero-title { font-size: clamp(2.8rem, 8vw, 5.5rem); font-weight: 600; color: var(--text-bright); line-height: 1.05; margin-bottom: 10px; letter-spacing: -.04em; }
.hero-title-accent {
  background: linear-gradient(135deg, var(--primary-light), #5ac8fa);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle { font-size: clamp(1.3rem, 3vw, 1.9rem); color: var(--text-bright-muted); font-weight: 400; margin-bottom: 12px; letter-spacing: -.02em; }
.hero-desc { color: var(--text-bright-muted); font-size: 1.15rem; max-width: 600px; margin: 0 auto 28px; font-weight: 400; }

.hero-actions { display: flex; gap: 36px; justify-content: center; margin-bottom: 64px; align-items: center; }
.hero-actions .btn-primary { box-shadow: none; }
.hero-actions .btn-ghost { border-color: rgba(255,255,255,.2); color: var(--primary-light); background: none; }
.hero-actions .btn-ghost:hover { background: var(--primary); border-color: var(--primary); }

/* 苹果风格链接式 CTA */
.hero-link-group { display: flex; gap: 36px; justify-content: center; margin-bottom: 64px; align-items: center; }
.hero-link { color: var(--primary-light); font-size: 1.15rem; font-weight: 400; }
.hero-link:hover { color: var(--primary-light); text-decoration: underline; }
.hero-link::after { content: ' \203A'; font-weight: 400; }

.hero-stats { display: flex; gap: 64px; justify-content: center; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { font-size: 2.8rem; font-weight: 600; color: var(--text-bright); letter-spacing: -.03em; }
.stat-suffix { font-size: 2.8rem; font-weight: 600; color: var(--primary-light); letter-spacing: -.03em; }
.stat-label { display: block; color: var(--text-bright-muted); font-size: .9rem; margin-top: 4px; }

.scroll-down {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  color: var(--text-bright-muted);
  animation: bounce 2s infinite;
}
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.about-text p { margin-bottom: 16px; color: var(--text-muted); font-size: 1.05rem; }
.about-text p:first-child { color: var(--text); font-size: 1.2rem; }

.about-meta { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 28px; }
.meta-item { display: flex; align-items: center; gap: 8px; color: var(--text-muted); font-size: .95rem; }

.about-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px; box-shadow: var(--shadow-sm);
}
.card-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 20px; color: var(--text); }
.card-list li { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); color: var(--text-muted); font-size: .95rem; }
.card-list li:last-child { border-bottom: none; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); flex-shrink: 0; }

/* ---------- 技能 ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }

.skill-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 28px; transition: all var(--transition); position: relative; overflow: hidden;
}
.skill-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.skill-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.skill-card:hover::before { transform: scaleX(1); }

.skill-icon { font-size: 1.8rem; font-family: var(--font-mono); font-weight: 600; color: var(--primary); margin-bottom: 16px; }
.skill-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.skill-desc { color: var(--text-muted); font-size: .9rem; margin-bottom: 16px; line-height: 1.5; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.skill-tags li { font-family: var(--font-mono); font-size: .72rem; color: var(--text-muted); background: var(--bg-alt); border: 1px solid var(--border); padding: 3px 8px; border-radius: var(--radius-pill); }

/* ---------- 作品集 ---------- */
.portfolio-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }

.portfolio-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all var(--transition); cursor: pointer;
}
.portfolio-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.portfolio-thumb {
  height: 200px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--g1), var(--g2));
  position: relative;
}
.portfolio-thumb::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 28px 28px;
}
.portfolio-emoji { font-size: 3.2rem; filter: drop-shadow(0 2px 8px rgba(0,0,0,.15)); z-index: 1; }

.portfolio-body { padding: 28px; }
.portfolio-cat { font-family: var(--font-mono); font-size: .7rem; color: var(--primary); text-transform: uppercase; letter-spacing: .08em; }
.portfolio-title { font-size: 1.3rem; font-weight: 600; margin: 6px 0 8px; color: var(--text); letter-spacing: -.02em; }
.portfolio-body p { color: var(--text-muted); font-size: .92rem; margin-bottom: 16px; line-height: 1.5; }
.portfolio-stack { display: flex; flex-wrap: wrap; gap: 6px; }
.portfolio-stack span { font-size: .72rem; color: var(--text-muted); background: var(--bg-alt); border: 1px solid var(--border); padding: 3px 8px; border-radius: var(--radius-pill); }

/* ---------- 博客预览 ---------- */
.blog-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }

.blog-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all var(--transition); display: flex; flex-direction: column;
}
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.blog-card-cover { height: 160px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--g1, var(--primary)), var(--g2, var(--primary-light))); }
.blog-card-cover span { font-size: 2.5rem; }
.blog-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.blog-card-tag { font-family: var(--font-mono); font-size: .7rem; color: var(--primary); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 8px; }
.blog-card-ext { display: inline-block; font-family: var(--font-mono); font-size: .62rem; color: #fff; background: linear-gradient(135deg, #fc554c, #fd8e2e); padding: 2px 7px; border-radius: var(--radius-pill); margin-left: 8px; vertical-align: middle; }
.blog-card-title { font-size: 1.15rem; font-weight: 600; color: var(--text); margin-bottom: 8px; line-height: 1.3; transition: color var(--transition); letter-spacing: -.02em; }
.blog-card:hover .blog-card-title { color: var(--primary); }
.blog-card-excerpt { color: var(--text-muted); font-size: .88rem; flex: 1; margin-bottom: 16px; line-height: 1.5; }
.blog-card-meta { display: flex; align-items: center; gap: 12px; font-size: .78rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 14px; }
.blog-card-meta span { display: flex; align-items: center; gap: 4px; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 48px; align-items: start; }

.contact-info-panel { padding: 8px 0; }
.contact-info-panel h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 12px; letter-spacing: -.02em; }
.contact-info-panel > p { color: var(--text-muted); margin-bottom: 32px; font-size: 1.02rem; }

.contact-list li { display: flex; align-items: flex-start; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.contact-list li:last-child { border-bottom: none; }
.contact-icon { font-size: 1.2rem; flex-shrink: 0; }
.contact-list strong { display: block; font-size: .75rem; color: var(--text-muted); margin-bottom: 2px; font-weight: 500; }
.contact-list div { color: var(--text); font-size: .95rem; }

.contact-form {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 36px; box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: .82rem; font-weight: 500; color: var(--text-muted); margin-bottom: 6px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-alt); color: var(--text); font-family: var(--font-sans); font-size: .95rem;
  transition: all var(--transition); -webkit-appearance: none;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(0,113,227,.12);
}
.form-group textarea { resize: vertical; }
.form-success { display: none; color: #34c759; font-size: .9rem; margin-top: 12px; text-align: center; }
.form-success.show { display: block; }
.form-error { display: none; color: #ff3b30; font-size: .9rem; margin-top: 12px; text-align: center; }
.form-error.show { display: block; }
.char-count { float: right; font-size: .75rem; color: var(--text-muted); font-weight: 400; font-family: var(--font-mono); }
.char-count.warn { color: #ff9500; }
.char-count.max { color: #ff3b30; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary.loading { pointer-events: none; }
.btn-loading-dot { display: inline-block; width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.3); border-top-color: #fff; border-radius: 50%; animation: spin .6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-left p { color: var(--text-muted); font-size: .8rem; line-height: 1.6; }
.footer-left a { color: var(--text-muted); }
.footer-left a:hover { color: var(--primary); text-decoration: underline; }
.back-to-top {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; color: var(--text-muted);
  transition: all var(--transition);
}
.back-to-top:hover { color: var(--primary); border-color: var(--primary); transform: translateY(-2px); }

/* ---------- 滚动动画 ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .8s ease, transform .8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 博客文章页样式 ---------- */
.post-layout { padding-top: 44px; }
.post-header { text-align: center; padding: 80px 0 40px; }
.post-tag { display: inline-block; font-family: var(--font-mono); font-size: .72rem; color: var(--primary); background: rgba(0,113,227,.08); padding: 3px 12px; border-radius: var(--radius-pill); margin-bottom: 16px; }
.post-title { font-size: clamp(2rem, 5vw, 3rem); font-weight: 600; line-height: 1.15; margin-bottom: 16px; color: var(--text); max-width: 720px; margin-left: auto; margin-right: auto; letter-spacing: -.03em; }
.post-meta { display: flex; align-items: center; justify-content: center; gap: 24px; color: var(--text-muted); font-size: .88rem; flex-wrap: wrap; }
.post-meta span { display: flex; align-items: center; gap: 6px; }

.post-body { max-width: 720px; margin: 0 auto; padding: 0 0 80px; font-size: 1.05rem; line-height: 1.65; }
.post-body h2 { font-size: 1.8rem; font-weight: 600; margin: 48px 0 16px; color: var(--text); padding-top: 24px; border-top: 1px solid var(--border); letter-spacing: -.02em; }
.post-body h2:first-child { border-top: none; padding-top: 0; }
.post-body h3 { font-size: 1.3rem; font-weight: 600; margin: 32px 0 12px; color: var(--text); letter-spacing: -.02em; }
.post-body p { margin-bottom: 16px; color: var(--text); }
.post-body ul, .post-body ol { margin: 0 0 20px 24px; }
.post-body li { margin-bottom: 8px; color: var(--text); }
.post-body ul li { list-style: disc; }
.post-body ol li { list-style: decimal; }
.post-body code { font-family: var(--font-mono); font-size: .85em; background: var(--bg-alt); border: 1px solid var(--border); padding: 2px 6px; border-radius: 6px; color: var(--primary); }
.post-body pre { background: #1d1d1f; border-radius: var(--radius); padding: 24px; overflow-x: auto; margin: 0 0 24px; border: 1px solid var(--border); }
.post-body pre code { background: none; border: none; padding: 0; color: #f5f5f7; font-size: .82rem; line-height: 1.6; }
.post-body blockquote { border-left: 3px solid var(--primary); padding: 12px 24px; margin: 0 0 24px; background: var(--bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-muted); }
.post-body a { font-weight: 400; }
.post-body img { border-radius: var(--radius); margin: 24px 0; }

.post-footer { border-top: 1px solid var(--border); padding-top: 32px; margin-top: 40px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.post-share { display: flex; gap: 12px; }
.post-share a { font-size: .82rem; color: var(--text-muted); padding: 8px 16px; border: 1px solid var(--border); border-radius: var(--radius-pill); transition: all var(--transition); }
.post-share a:hover { color: var(--primary); border-color: var(--primary); text-decoration: none; }

/* 博客列表页 */
.blog-page-header { padding: 100px 0 40px; text-align: center; }
.blog-page-title { font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 600; margin-bottom: 12px; letter-spacing: -.03em; }
.blog-page-desc { color: var(--text-muted); max-width: 500px; margin: 0 auto; font-size: 1.05rem; }
.blog-filter { display: flex; justify-content: center; gap: 8px; margin-bottom: 40px; flex-wrap: wrap; }
.blog-filter button { padding: 8px 20px; border: 1px solid var(--border); background: transparent; color: var(--text-muted); border-radius: var(--radius-pill); font-size: .82rem; cursor: pointer; transition: all var(--transition); }
.blog-filter button:hover, .blog-filter button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.blog-page-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; padding-bottom: 80px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .section-header-row { flex-direction: column; gap: 16px; align-items: center; text-align: center; }
}

@media (max-width: 834px) {
  .nav-menu {
    position: fixed; top: 44px; left: 0; right: 0;
    background: rgba(0,0,0,.9); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    flex-direction: column; padding: 16px; gap: 0;
    transform: translateY(-150%); transition: transform var(--transition);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-link { padding: 14px 16px; font-size: 1rem; border-bottom: 1px solid rgba(255,255,255,.08); }
  .nav-link:last-child { border-bottom: none; }
  .nav-burger { display: flex; }

  .section { padding: 64px 0; }
  .hero { min-height: auto; padding: 100px 0 64px; }
  .hero-stats { gap: 32px; }
  .stat-num, .stat-suffix { font-size: 2.2rem; }
  .hero-actions, .hero-link-group { flex-direction: column; gap: 16px; max-width: 280px; margin-left: auto; margin-right: auto; }
  .hero-actions .btn { width: 100%; }

  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }

  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions, .hero-link-group { margin-bottom: 40px; }
  .hero-stats { gap: 24px; }
  .stat-num, .stat-suffix { font-size: 1.8rem; }
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---------- 选区 ---------- */
::selection { background: rgba(0,113,227,.2); }

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}