/* =============================================
   老石资讯分享 gxdrone.com 全站样式 v2.0
   定位：广西无人机行业垂直领域专家
   风格：专业可信 + 科技感 + 广西地域特色
   响应式：Mobile First + Tablet + Desktop
   ============================================= */

/* ---- Design Tokens ---- */
:root {
  /* Brand Colors */
  --primary: #0a6e4f;
  --primary-light: #0d8a64;
  --primary-lighter: #e6f5ef;
  --primary-dark: #075940;
  --accent: #f5a623;
  --accent-light: #ffc04d;

  /* Neutrals */
  --bg: #f5f7fa;
  --bg-alt: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --border-light: #f3f4f6;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);

  /* Radius */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.3s var(--ease);
  --transition-fast: all 0.15s var(--ease);

  /* Z-index */
  --z-header: 1000;
  --z-menu: 999;
  --z-modal: 2000;
  --z-toast: 3000;
}

/* ---- Reset ---- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  background: var(--primary);
  color: #fff !important;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 12px rgba(10, 110, 79, 0.25);
  line-height: 1.5;
}
.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(10, 110, 79, 0.35);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  background: transparent;
  color: #fff;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 15px;
  border: 2px solid rgba(255,255,255,0.6);
  cursor: pointer;
  transition: var(--transition);
  line-height: 1.5;
}
.btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  color: var(--primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 15px;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: var(--transition);
}
.btn-ghost:hover { background: var(--primary); color: #fff; }

.btn-full { width: 100%; }

/* ---- Header / Navigation ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon {
  font-size: 30px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-lighter);
  border-radius: var(--radius-sm);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.3; }
.logo-cn { font-weight: 700; font-size: 17px; color: var(--primary); letter-spacing: -0.3px; }
.logo-en { font-size: 11px; color: var(--text-muted); letter-spacing: 0.5px; }

.main-nav {
  display: none;
  align-items: center;
  gap: var(--space-2);
}
.nav-link {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: var(--primary-lighter);
}
.nav-btn {
  padding: var(--space-2) var(--space-5);
  background: var(--primary);
  color: #fff !important;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  margin-left: var(--space-2);
  border: none;
}
.nav-btn:hover { background: var(--primary-light); transform: translateY(-1px); }

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  color: var(--text-primary);
}
.mobile-menu-btn:hover { background: var(--border-light); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  z-index: var(--z-menu);
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-lg);
  animation: slideDown 0.2s var(--ease);
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.mobile-menu.open { display: block; }
.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition);
}
.mobile-nav-link:hover { background: var(--primary-lighter); color: var(--primary); }
.mobile-nav-link:last-child {
  color: var(--primary);
  font-weight: 600;
  border-top: 1px solid var(--border);
  margin-top: var(--space-2);
  padding-top: var(--space-4);
}

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 68px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(10,110,79,0.18) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(245,166,35,0.12) 0%, transparent 50%),
    linear-gradient(160deg, #071f16 0%, #0a3d2c 30%, #0a6e4f 65%, #0d8a64 100%);
  z-index: 0;
}
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px),
    radial-gradient(circle at 30% 70%, rgba(255,255,255,0.06) 1px, transparent 1px),
    radial-gradient(circle at 70% 30%, rgba(245,166,35,0.12) 2px, transparent 2px);
  background-size: 80px 80px, 120px 120px, 100px 100px;
  background-position: 0 0, 40px 40px, 60px 20px;
  animation: starFloat 20s linear infinite;
}
@keyframes starFloat {
  0% { background-position: 0 0, 40px 40px, 60px 20px; }
  100% { background-position: 0 -80px, 40px -120px, 60px -100px; }
}

.hero-content {
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
  color: #fff;
  padding: var(--space-10) 0 var(--space-16);
  animation: fadeInUp 0.6s var(--ease);
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  backdrop-filter: blur(8px);
  padding: 6px var(--space-4);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: var(--space-6);
  letter-spacing: 0.5px;
}
.hero-title {
  font-size: clamp(28px, 6vw, 52px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: var(--space-5);
  text-shadow: 0 2px 24px rgba(0,0,0,0.3);
  letter-spacing: -0.5px;
}
.hero-sub {
  font-size: clamp(15px, 2.5vw, 18px);
  opacity: 0.85;
  margin: 0 auto var(--space-8);
  max-width: 520px;
  line-height: 1.7;
}
.hero-actions {
  justify-content: center;
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.15);
}
.stat { text-align: center; }
.stat strong {
  display: block;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 800;
  letter-spacing: -0.5px;
}
.stat span { font-size: 13px; opacity: 0.7; }

/* ---- Notice Bar ---- */
.notice-bar {
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: var(--space-3) 0;
  overflow: hidden;
}
.notice-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 14px;
  white-space: nowrap;
}
.notice-icon { font-size: 16px; flex-shrink: 0; }
.notice-text { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.notice-link {
  color: #ffffff;
  color: var(--accent-light);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.notice-link:hover { color: #fff; }

/* ---- Sections ---- */
.section { padding: var(--space-16) 0; }
.section-alt { background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: var(--space-12); }
.section-tag {
  display: inline-block;
  background: var(--primary-lighter);
  color: var(--primary);
  padding: 4px var(--space-4);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: -0.3px;
}
.section-desc {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- Policy Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
.policy-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.policy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.policy-card-body { padding: var(--space-5); }
.policy-card-tag {
  display: inline-block;
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.tag-national { background: rgba(245,166,35,0.1); color: #c07d10; }
.tag-guangxi { background: var(--primary-lighter); color: var(--primary); }
.tag-interpret { background: rgba(66,99,235,0.08); color: #3b5bdb; }
.tag-监管动态 { background: rgba(239,68,68,0.08); color: #dc2626; }
.tag-行业应用 { background: rgba(59,130,246,0.08); color: #2563eb; }
.tag-市场趋势 { background: rgba(139,92,246,0.08); color: #7c3aed; }
.policy-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.policy-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.policy-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-light);
}
.policy-card-date { font-size: 12px; color: var(--text-muted); }
.policy-card-more {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
}
.policy-card-more:hover { color: var(--primary-light); }

/* ---- News Grid ---- */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
.news-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.news-card-body { padding: var(--space-5); }
.news-card-tag {
  display: inline-block;
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  background: var(--bg);
  color: var(--text-secondary);
}
.news-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-4);
}
.news-card-footer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  color: var(--text-muted);
}

/* ---- About Section ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}
.about-content h2 {
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 800;
  margin: var(--space-3) 0 var(--space-5);
  letter-spacing: -0.3px;
}
.about-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-3);
}
.about-list { margin: var(--space-4) 0 var(--space-6); }
.about-list li {
  font-size: 15px;
  color: var(--text-secondary);
  padding: var(--space-2) 0;
  display: flex;
  gap: var(--space-3);
  line-height: 1.6;
}
.about-values { display: flex; flex-direction: column; gap: var(--space-4); }
.value-card {
  display: flex;
  gap: var(--space-4);
  background: var(--bg);
  border-radius: var(--radius);
  padding: var(--space-5);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.value-card:hover { border-color: var(--primary); transform: translateX(4px); box-shadow: var(--shadow-sm); }
.value-icon { font-size: 28px; flex-shrink: 0; }
.value-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.value-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ---- Contact Form ---- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
}
.contact-form {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }
.form-group { margin-bottom: var(--space-4); }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.required { color: #ef4444; }
.form-group input,
/* 自定义 select 下拉箭头 */
.form-group {
  position: relative;
}
.form-group select {
  padding-right: 36px !important;
}
.form-group.has-select {
  position: relative;
}
.form-group.has-select::after {
  content: '';
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--text-muted, #9ca3af);
  pointer-events: none;
}

.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px var(--space-4);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg);
  transition: var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(10,110,79,0.08);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-note {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--space-3);
}

.contact-info { display: flex; flex-direction: column; gap: var(--space-4); }
.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: var(--space-5);
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.contact-icon { font-size: 24px; flex-shrink: 0; }
.contact-card h4 { font-size: 13px; color: var(--text-muted); font-weight: 500; margin-bottom: 2px; }
.contact-card p { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.service-note {
  background: var(--primary-lighter);
  border: 1px solid rgba(10,110,79,0.15);
  border-radius: var(--radius);
  padding: var(--space-4);
}
.service-note p { font-size: 13px; color: var(--primary-dark); line-height: 1.6; }

/* ---- Form Success ---- */
.form-success {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}
.form-success-icon { font-size: 52px; margin-bottom: var(--space-4); }
.form-success h3 { font-size: 22px; font-weight: 700; margin-bottom: var(--space-3); color: var(--primary); }
.form-success p { font-size: 15px; color: var(--text-secondary); }

/* ---- Load More ---- */
.load-more-wrap { text-align: center; padding: var(--space-4) 0 0; }
.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.load-more-btn:hover { background: var(--primary); color: #fff; }

/* ---- Footer ---- */
.site-footer { background: #071f16; color: rgba(255,255,255,0.8); padding-top: var(--space-16); }
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-10);
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-4);
}
.footer-logo span:first-child { font-size: 28px; }
.footer-brand p { font-size: 13px; line-height: 1.7; opacity: 0.6; }
.footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-4);
}
.footer-col a, .footer-col p {
  display: block;
  font-size: 13px;
  opacity: 0.6;
  margin-bottom: var(--space-2);
  transition: var(--transition);
}
.footer-col a:hover { opacity: 1; color: var(--accent-light); }
.footer-bottom {
  color: rgba(255, 255, 255, 0.65);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: var(--space-5) 0;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.65);
}
.footer-bottom a { color: inherit; }
.footer-bottom a:hover { opacity: 1; color: var(--accent-light); }
.footer-bottom p + p { margin-top: var(--space-1); }

/* =============================================
   Responsive Breakpoints
   ============================================= */

/* Tablet: 640px+ */
@media (min-width: 640px) {
  .container { padding: 0 var(--space-8); }
  .article-detail-wrap { padding: var(--space-10) var(--space-8) var(--space-16); }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr 1fr; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
}

/* Tablet Landscape: 768px+ */
@media (min-width: 768px) {
  .section { padding: var(--space-20) 0; }
  .article-detail-wrap { padding: var(--space-12) var(--space-12) var(--space-20); }
  .article-body { line-height: 2; }
  .hero-content { padding: var(--space-12) 0 var(--space-16); }
  .about-grid { grid-template-columns: 1fr 1fr; gap: var(--space-16); }
  .contact-wrapper { grid-template-columns: 1.1fr 0.9fr; gap: var(--space-12); }
  .footer-inner { grid-template-columns: 1fr 2fr; gap: var(--space-16); }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  .main-nav { display: flex; }
  .mobile-menu-btn { display: none; }
  .hero-stats { gap: var(--space-12); }
  .container { padding: 0 var(--space-10); }
  .article-detail-wrap { padding: var(--space-12) var(--space-6) var(--space-20); }
}

/* Large Desktop: 1280px+ */
@media (min-width: 1280px) {
  .container { padding: 0 var(--space-16); }
  .article-detail-wrap { padding: var(--space-12) var(--space-6) var(--space-20); }
}

/* =============================================
   Article Detail Page Styles
   ============================================= */

/* Article List */
.all-list-header { margin-bottom: var(--space-8); }
.all-list-header h1 { font-size: clamp(24px, 4vw, 30px); font-weight: 800; color: var(--text-primary); margin-bottom: var(--space-2); }
.all-list-header p { font-size: 14px; color: var(--text-muted); }

.article-list-item {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  text-decoration: none;
  transition: var(--transition);
  margin-bottom: var(--space-4);
}
.article-list-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  transform: translateY(-2px);
}
.article-list-meta { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-2); }
.article-list-title { font-size: 16px; font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-2); line-height: 1.5; }
.article-list-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-list-read { font-size: 13px; color: var(--primary); margin-top: var(--space-2); font-weight: 600; }

/* Article Detail */
.article-detail-wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}
.article-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary);
  font-size: 14px;
  margin-bottom: var(--space-6);
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--primary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  transition: var(--transition);
}
.article-back:hover { opacity: 0.7; }

.article-tag {
  display: flex;
  justify-content: center;
  padding: 4px var(--space-3);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.article-title {
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-4);
  letter-spacing: 0.02em;
}
.article-meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-5);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border);
  margin: 0 auto var(--space-8);
}
.article-source { color: var(--text-muted); font-weight: 400; }

/* Article Toolbar */
.article-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto var(--space-8);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: var(--space-3);
}
.font-size-switch {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.font-size-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  padding: 0 var(--space-3);
  background: #fff;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13px;
  transition: var(--transition-fast);
  border-right: 1px solid var(--border);
}
.font-size-btn:last-child { border-right: none; }
.font-size-btn:hover { background: var(--bg); }
.font-size-btn.active { background: var(--primary); color: #fff; }
.font-label { font-size: 12px; color: var(--text-muted); margin-right: var(--space-2); }
.share-btns { display: flex; align-items: center; gap: var(--space-2); }
.share-wechat {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px var(--space-4);
  background: #07c160;
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.share-wechat:hover { background: #06ad56; }
.share-wechat svg { width: 16px; height: 16px; fill: #fff; }

/* Article Body */
.article-body {
  letter-spacing: 0.02em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-secondary);
  transition: font-size 0.2s var(--ease);
  text-align: justify;
  word-break: break-all;
  overflow-wrap: break-word;
}
.article-body.font-small { font-size: 14px; }
.article-body.font-medium { font-size: 16px; }
.article-body.font-large { font-size: 19px; }
.article-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.6em 0 0.8em;
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--primary-lighter);
  line-height: 1.5;
}
.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin: var(--space-6) 0 var(--space-3);
}
.article-body p { margin-bottom: 1.3em; text-indent: 2em; }
.article-body ul, .article-body ol { margin: var(--space-4) 0; padding-left: var(--space-6); }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: var(--space-2); line-height: 1.8; }
.article-body strong { color: var(--text-primary); }
.article-body table { width: 100%; border-collapse: collapse; margin: var(--space-5) 0; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: var(--space-3); text-align: left; font-size: 14px; }
.article-body th { background: var(--bg); font-weight: 600; }

/* Article CTA */
.article-cta {
  box-shadow: 0 4px 24px rgba(22,163,74,0.25);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-top: var(--space-12);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}
.article-cta-icon { font-size: 36px; flex-shrink: 0; }
.article-cta h3 { font-size: 18px; font-weight: 700; margin-bottom: var(--space-2); }
.article-cta p { font-size: 14px; opacity: 0.85; text-indent: 0; margin-bottom: 0; }
.article-cta a {
  background: #fff;
  color: var(--primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}
.article-cta a:hover { background: var(--primary-lighter); }

/* Article Not Found */
.article-not-found { text-align: center; padding: var(--space-16) var(--space-5); }
.article-not-found h2 { font-size: 24px; margin-bottom: var(--space-4); }
.article-not-found a { color: var(--primary); }

/* WeChat Share Popup */
.wechat-share-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: var(--z-modal);
  justify-content: center;
  align-items: center;
}
.wechat-share-overlay.show { display: flex; }
.wechat-share-popup {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  max-width: 320px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: popIn 0.3s var(--ease);
}
@keyframes popIn {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.wechat-share-popup h3 { font-size: 17px; color: var(--text-primary); margin-bottom: var(--space-4); font-weight: 700; }
.wechat-share-popup .qr-wrap { background: var(--bg); border-radius: var(--radius); padding: var(--space-4); margin-bottom: var(--space-4); }
.wechat-share-popup .qr-wrap canvas { display: block; margin: 0 auto; }
.wechat-share-popup p { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: var(--space-5); }
.wechat-share-popup .close-btn {
  display: inline-block;
  padding: var(--space-2) var(--space-8);
  background: var(--bg);
  border: none;
  border-radius: var(--radius-full);
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.wechat-share-popup .close-btn:hover { background: var(--border); }

/* Back button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  margin-bottom: var(--space-6);
  transition: var(--transition);
}
.back-btn:hover { background: var(--border); color: var(--text-primary); }

/* Loading */
.loading { text-align: center; padding: var(--space-16) var(--space-5); font-size: 16px; color: var(--text-muted); }

/* =============================================
   Article Detail Modal (from script.js)
   ============================================= */
.article-modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s var(--ease);
}
.article-modal.active { opacity: 1; visibility: visible; }
.article-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
}
.article-modal-content {
  position: relative;
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: all 0.3s var(--ease);
  -webkit-overflow-scrolling: touch;
}
.article-modal.active .article-modal-content { transform: translateY(0) scale(1); }
.article-modal-close {
  position: sticky;
  top: 0;
  float: right;
  margin: var(--space-4);
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg);
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 10;
}
.article-modal-close:hover { background: var(--primary); color: white; }
.article-detail { padding: var(--space-6) var(--space-8) var(--space-10); }
.article-header { margin-bottom: var(--space-8); padding-bottom: var(--space-6); border-bottom: 1px solid var(--border); }
.article-footer { margin-top: var(--space-10); padding-top: var(--space-6); border-top: 1px solid var(--border); text-align: center; }
.article-footer p { margin-bottom: var(--space-4); color: var(--text-muted); }

/* =============================================
   CTA Box
   ============================================= */
.cta-box {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius);
  padding: var(--space-8);
  color: #fff;
  flex-direction: column;
  text-align: center;
}
.cta-icon { font-size: 40px; flex-shrink: 0; }
.cta-text { flex: 1; }
.cta-text h3 { font-size: 20px; font-weight: 700; margin-bottom: var(--space-2); }
.cta-text p { font-size: 14px; opacity: 0.85; }

/* =============================================
   Tablet Landscape overrides
   ============================================= */
@media (min-width: 768px) {
  .article-detail { padding: var(--space-10); }
  .cta-box { flex-direction: row; text-align: left; }
  .article-cta {
  box-shadow: 0 4px 24px rgba(22,163,74,0.25); flex-direction: row; padding: var(--space-8) var(--space-10); }
}


/* 无障碍：减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}