/* ==========================================================================
   特征智能 - 全局样式 (亮色系 · 科技感)
   ========================================================================== */

/* CSS变量 */
:root {
  --color-bg: #ffffff;
  --color-bg-2: #fafbfc;
  --color-bg-3: #f1f5f9;
  --color-surface: #ffffff;
  --color-surface-2: #f8fafc;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;

  --color-primary: #0284c7;
  --color-primary-light: #38bdf8;
  --color-primary-dark: #0369a1;
  --color-secondary: #6366f1;
  --color-accent: #a855f7;
  --color-pink: #ec4899;
  --color-amber: #f59e0b;

  --color-text: #0f172a;
  --color-text-2: #334155;
  --color-text-3: #64748b;
  --color-text-4: #94a3b8;

  --gradient-primary: linear-gradient(135deg, #0284c7 0%, #6366f1 50%, #a855f7 100%);
  --gradient-soft: linear-gradient(135deg, #e0f2fe 0%, #ede9fe 100%);
  --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
  --gradient-bg-soft: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.1);
  --shadow-glow: 0 8px 32px rgba(2, 132, 199, 0.15);
  --shadow-primary: 0 8px 24px rgba(2, 132, 199, 0.25);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --container-max: 1280px;
  --header-height: 72px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
  "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  background-image:
    radial-gradient(at 0% 0%, rgba(2, 132, 199, 0.06) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(168, 85, 247, 0.05) 0px, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  min-height: 100dvh; /* 动态视口高度，避免移动浏览器地址栏影响 */
}
img, svg { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; transition: color var(--transition-fast); -webkit-tap-highlight-color: transparent; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; -webkit-tap-highlight-color: transparent; }
ul, ol { list-style: none; }

/* 容器 */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ==========================================================================
   全局背景 - 极轻网格 + 微光
   ========================================================================== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}

/* ==========================================================================
   导航栏
   ========================================================================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-normal);
}
.header.scrolled {
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.5px;
  color: var(--color-text);
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}
.logo-mark::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.25) 100%);
}
.logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.logo-sub {
  font-size: 11px;
  color: var(--color-text-3);
  font-weight: 400;
  margin-left: 2px;
}

/* LOGO 图片（替换版 · 1.5倍尺寸） */
.logo-img {
  height: 66px;             /* 原 44px × 1.5 */
  width: auto;
  max-width: 270px;         /* 原 180px × 1.5 */
  object-fit: contain;
  display: block;
  transition: opacity var(--transition-fast);
}
.logo:hover .logo-img { opacity: 0.85; }
.logo-img-footer {
  height: 57px;             /* 原 38px × 1.5 */
  width: auto;
  max-width: 240px;         /* 原 160px × 1.5 */
  object-fit: contain;
  display: block;
}
@media (max-width: 768px) {
  .logo-img { height: 56px; }
  .logo-img-footer { height: 48px; }
}
@media (max-width: 480px) {
  .logo-img { height: 48px; }
  .logo-img-footer { height: 42px; }
}

/* 导航菜单 */
.nav-main { display: flex; align-items: center; gap: 4px; }
.nav-item {
  position: relative;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text-2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-weight: 500;
}
.nav-item:hover { color: var(--color-text); background: var(--color-bg-3); }
.nav-item.active { color: var(--color-primary); background: rgba(2, 132, 199, 0.08); }
.nav-item.has-sub::after {
  content: '';
  display: inline-block;
  margin-left: 6px;
  border: 4px solid transparent;
  border-top-color: currentColor;
  vertical-align: middle;
  transition: transform var(--transition-fast);
}
.nav-item.has-sub:hover::after { transform: rotate(180deg); }

.nav-submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-lg);
}
.nav-item.has-sub:hover .nav-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-submenu a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-text-2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-submenu a:hover {
  color: var(--color-primary);
  background: rgba(2, 132, 199, 0.06);
}

/* 移动端菜单 */
.menu-toggle {
  display: none;
  padding: 8px;
  position: relative;
  z-index: 10;
}
.menu-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  letter-spacing: 0.3px;
}
.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(2, 132, 199, 0.35);
}
.btn-outline {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(2, 132, 199, 0.04);
  color: var(--color-primary);
  transform: translateY(-2px);
}
.btn-ghost { color: var(--color-primary); padding: 8px 16px; }
.btn-ghost:hover { color: var(--color-primary-dark); }

/* ==========================================================================
   通用区块样式
   ========================================================================== */
.section {
  padding: 120px 0;
  position: relative;
}
.section-sm { padding: 80px 0; }

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 22px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(2, 132, 199, 0.18);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 0.3px;
}
.section-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.section-title .gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-subtitle {
  display: inline-block;
  font-size: 0.78em;
  font-weight: 600;
  color: var(--color-text-2);
  letter-spacing: 0;
}
.section-desc {
  font-size: 17px;
  color: var(--color-text-3);
  line-height: 1.7;
}

/* ==========================================================================
   首页 - Hero 图片轮播
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: var(--header-height);
  overflow: hidden;
  background: var(--color-bg);
}

.hero-slider {
  position: relative;
  height: calc(100vh - var(--header-height));
  min-height: 600px;
  max-height: 760px;
  z-index: 1;
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}
.hero-slide.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.hero-slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1.05);
  transition: transform 6s ease-out;
}
.hero-slide.active .hero-slide-bg { transform: scale(1); }
.hero-slide-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(15, 23, 42, 0.55) 50%, rgba(2, 132, 199, 0.4) 100%);
}
.hero-slide-overlay-light {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 255, 255, 0.75) 50%, rgba(2, 132, 199, 0.15) 100%);
}
.hero-content-wrap {
  position: relative;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 50px 24px 0;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  z-index: 2;
}
.hero-content-right { justify-content: flex-end; }
.hero-content-right .hero-text { text-align: left; }
.hero-text {
  max-width: 720px;
  z-index: 2;
  color: #fff;
}
.hero-slide-overlay-light ~ .hero-content-wrap .hero-text,
.hero-light .hero-text {
  color: var(--color-text);
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  font-size: 13px;
  color: #fff;
  margin-bottom: 24px;
}
.hero-light .hero-tag {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(2, 132, 199, 0.2);
  color: var(--color-primary);
  backdrop-filter: blur(12px);
}
.hero-tag-dot {
  width: 8px; height: 8px;
  background: var(--color-primary-light);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-primary-light);
  animation: pulse 2s infinite;
}
.hero-light .hero-tag-dot {
  background: var(--color-primary);
  box-shadow: 0 0 8px rgba(2, 132, 199, 0.6);
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}
.hero-title {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
  color: #fff;
  text-shadow: 0 4px 32px rgba(0, 0, 0, 0.3);
}
.hero-light .hero-title {
  color: var(--color-text);
  text-shadow: none;
}
.hero-title .gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-light .hero-title .gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 540px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}
.hero-light .hero-desc {
  color: var(--color-text-2);
  text-shadow: none;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-light .btn-outline {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(2, 132, 199, 0.3);
}

/* 轮播控制 */
.hero-dots {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 5;
}
.hero-dot {
  width: 40px; height: 4px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition-normal);
}
.hero-light .hero-dot { background: rgba(15, 23, 42, 0.2); }
.hero-dot.active {
  background: var(--gradient-primary);
  width: 60px;
}

/* 滚动指示 */
.scroll-indicator {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  color: rgba(255, 255, 255, 0.8);
  font-size: 12px;
  letter-spacing: 1px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: bounce 2s ease-in-out infinite;
}
.hero-light .scroll-indicator { color: var(--color-text-3); }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}
.scroll-line {
  width: 1px;
  height: 30px;
  background: linear-gradient(to bottom, currentColor, transparent);
}

/* ==========================================================================
   卡片网格 - 通用
   ========================================================================== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.card:hover {
  border-color: rgba(2, 132, 199, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
  border: 1px solid rgba(2, 132, 199, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
}
/* 水平布局卡片（图标在左、内容在右） */
.card-horizontal {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 20px;
}
.card-horizontal .card-icon { margin-bottom: 0; }
.card-horizontal .card-body { flex: 1; min-width: 0; }
.card-horizontal .card-title { margin-bottom: 8px; }
.card-horizontal .card-desc { margin-bottom: 0; }
.card-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.card-desc {
  font-size: 15px;
  color: var(--color-text-3);
  line-height: 1.7;
  margin-bottom: 20px;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
  transition: gap var(--transition-fast);
}
.card-link:hover { gap: 12px; }
.card-link::after { content: '→'; }

/* ==========================================================================
   二维码展示区
   ========================================================================== */
.qr-section {
  margin-top: 64px;
  padding: 40px 24px;
  background: var(--gradient-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}
.qr-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -10%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.12) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}
.qr-section::after {
  content: '';
  position: absolute;
  bottom: -50%; right: -10%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}
.qr-section > * { position: relative; z-index: 1; }
.qr-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.qr-codes {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 0;
  margin-top: 28px;
}
.qr-card {
  text-align: center;
}
.qr-img {
  width: 160px;
  height: 160px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}
.qr-img:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(2, 132, 199, 0.3);
}
.qr-svg {
  width: 100%;
  height: 100%;
  display: block;
}
.qr-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 4px;
}
.qr-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.5px;
}
.qr-hint {
  font-size: 14px;
  color: var(--color-text-3);
  margin-top: 0;
  margin-bottom: 0;
}
@media (max-width: 480px) {
  .qr-section { padding: 32px 20px; }
  .qr-codes { gap: 24px; }
  .qr-img { width: 140px; height: 140px; }
}

/* ==========================================================================
   课程大纲（带行号的时间线样式）
   ========================================================================== */
.course-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.course-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 24px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.course-item:hover {
  border-color: rgba(2, 132, 199, 0.3);
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}
.course-num {
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-family: 'JetBrains Mono', monospace;
}
.course-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.course-detail {
  font-size: 14px;
  color: var(--color-text-3);
}
.course-hours {
  padding: 6px 14px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

/* ==========================================================================
   大赛流程 - 时间线
   ========================================================================== */
.timeline {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 12px;
  margin-top: 48px;
}
.timeline-step {
  text-align: center;
  padding: 24px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.timeline-step:hover {
  border-color: rgba(2, 132, 199, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.timeline-step-num {
  display: inline-block;
  width: 32px; height: 32px;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 50%;
  line-height: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}
.timeline-step-name {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

/* ==========================================================================
   客户 logo 墙
   ========================================================================== */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.logo-item {
  height: 90px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-3);
  transition: all var(--transition-normal);
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-sm);
}
.logo-item:hover {
  border-color: rgba(2, 132, 199, 0.3);
  color: var(--color-text);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   案例展示
   ========================================================================== */
.case-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.case-card:hover {
  border-color: rgba(2, 132, 199, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.case-thumb {
  height: 130px;
  background: var(--gradient-primary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.case-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 30%, rgba(0,0,0,0.15) 100%);
}
.case-thumb-icon {
  font-size: 48px;
  color: rgba(255,255,255,0.95);
  z-index: 1;
  text-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.case-info { padding: 28px; }
.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 12px;
}
.case-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.case-desc {
  font-size: 14px;
  color: var(--color-text-3);
  line-height: 1.6;
}

/* ==========================================================================
   Tab 切换
   ========================================================================== */
.tabs {
  display: flex;
  gap: 4px;
  padding: 6px;
  background: var(--color-bg-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin: 0 auto 56px;
  width: fit-content;
  max-width: 100%;
}
.tab {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.tab:hover { color: var(--color-text-2); }
.tab.active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.5s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   数据统计
   ========================================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 80px;
}
.stat {
  text-align: center;
  padding: 32px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(2, 132, 199, 0.3);
}
.stat-num {
  font-size: 48px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 8px;
  font-family: 'JetBrains Mono', monospace;
}
.stat-label {
  font-size: 14px;
  color: var(--color-text-3);
  letter-spacing: 0.5px;
}

/* ==========================================================================
   二维码弹窗
   ========================================================================== */
.qr-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.qr-modal.active {
  visibility: visible;
  opacity: 1;
}
.qr-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.qr-modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.92);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 90%;
  max-width: 360px;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.25);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
}
.qr-modal.active .qr-modal-content {
  transform: translate(-50%, -50%) scale(1);
}
.qr-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 32px;
  height: 32px;
  font-size: 24px;
  line-height: 1;
  color: var(--color-text-3);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-modal-close:hover {
  background: var(--color-bg-3);
  color: var(--color-text);
}
.qr-modal-img {
  width: 100%;
  aspect-ratio: 1;
  margin-bottom: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-2);
}
.qr-modal-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.qr-modal-text h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.qr-modal-text p {
  font-size: 14px;
  color: var(--color-text-3);
  line-height: 1.5;
}

/* ==========================================================================
   CTA 区块
   ========================================================================== */
.cta-section {
  text-align: center;
  padding: 50px 32px;
  background: var(--gradient-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  margin: 0 auto;
  max-width: 1200px;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.18) 0%, transparent 70%);
  filter: blur(60px);
}
.cta-section::after {
  content: '';
  position: absolute;
  bottom: -50%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18) 0%, transparent 70%);
  filter: blur(60px);
}
.cta-section > * { position: relative; z-index: 1; }
.cta-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.cta-pretitle {
  font-size: 0.62em;   /* 约小2号（约为主标题的 62%）*/
  font-weight: 600;
  color: var(--color-text-2);
  letter-spacing: 0;
  vertical-align: middle;
}
.cta-desc {
  font-size: 17px;
  color: var(--color-text-3);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ==========================================================================
   页面横幅（子页 · 带背景图版本）
   ========================================================================== */
.page-banner-image {
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
  color: #fff;
}
.page-banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 8s ease-out;
  z-index: 0;
}
.page-banner-image .container { position: relative; z-index: 2; }
.page-banner-overlay {
  position: absolute;
  inset: 0;
  background: rgba(90, 90, 90, 0.25);
  backdrop-filter: blur(1px);
  z-index: 1;
}
.page-banner-image .page-banner-tag {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
}
.page-banner-image .page-banner-title {
  color: #fff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}
.page-banner-image .page-banner-desc {
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

/* ==========================================================================
   页面横幅（子页）
   ========================================================================== */
.page-banner {
  padding: calc(var(--header-height) + 100px) 0 80px;
  position: relative;
  text-align: center;
  overflow: hidden;
  background: var(--gradient-bg-soft);
}
.page-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 400px;
  background: radial-gradient(ellipse, rgba(2, 132, 199, 0.12) 0%, transparent 70%);
  filter: blur(40px);
  z-index: -1;
}
.page-banner-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(2, 132, 199, 0.18);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 20px;
}
.page-banner-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.page-banner-title .gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-banner-desc {
  font-size: 18px;
  color: var(--color-text-3);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ==========================================================================
   表单输入（亮色主题适配）
   ========================================================================== */
.form-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 16px; /* 16px+ 防止 iOS 自动缩放 */
  font-family: inherit;
  transition: all var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
  min-height: 48px;
}
.form-input::placeholder {
  color: var(--color-text-4);
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.1);
}
select.form-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%2364748b'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 44px;
}
.form-textarea {
  margin-bottom: 24px;
  min-height: 120px;
  resize: vertical;
}

/* ==========================================================================
   联系信息
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 48px;
}
.contact-card {
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.contact-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(2, 132, 199, 0.3);
}
.contact-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
  border: 1px solid rgba(2, 132, 199, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-info-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}
.contact-info-content {
  color: var(--color-text-3);
  font-size: 15px;
  line-height: 1.6;
}
.contact-info-content a { color: var(--color-primary); }
.contact-info-content a:hover { color: var(--color-primary-dark); }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: 80px 0 32px;
  background: var(--color-bg-2);
  border-top: 1px solid var(--color-border);
  margin-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-col-title {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
  color: var(--color-text);
}
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a {
  color: var(--color-text-3);
  font-size: 14px;
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-primary); }
.footer-about {
  color: var(--color-text-3);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}
.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1px;
  color: var(--color-text-4);
  font-size: 13px;
}
.footer-icp {
  text-align: left;
  font-size: 12px;
  color: var(--color-text-4);
}
.footer-meta {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-text-4);
}
.footer-powered {
  color: var(--color-text-4);
  font-size: 12px;
}

/* ==========================================================================
   关于我们 - 团队优势 / 招聘
   ========================================================================== */
.feature-list {
  display: grid;
  gap: 24px;
  margin-top: 48px;
}
.feature-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.feature-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(2, 132, 199, 0.3);
}
.feature-check {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  color: #fff;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}
.feature-text h4 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.feature-text p {
  color: var(--color-text-3);
  font-size: 14px;
  line-height: 1.6;
}

/* 招聘 */
.job-list {
  display: grid;
  gap: 16px;
  margin-top: 48px;
}
.job-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}
.job-item:hover {
  border-color: rgba(2, 132, 199, 0.3);
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}
.job-title { font-size: 17px; font-weight: 600; color: var(--color-text); }
.job-meta { display: flex; gap: 16px; color: var(--color-text-3); font-size: 14px; }
.job-meta span { display: flex; align-items: center; gap: 4px; }
.job-arrow { color: var(--color-primary); font-size: 20px; }

/* ==========================================================================
   动画
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

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

/* 大屏适配（>= 1440px） */
@media (min-width: 1440px) {
  :root {
    --container-max: 1400px;
  }
}

/* 平板（<= 1024px） */
@media (max-width: 1024px) {
  .container { padding: 0 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .timeline { grid-template-columns: repeat(4, 1fr); }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .section { padding: 100px 0; }
  .section-sm { padding: 70px 0; }
  .header-inner { padding: 0 32px; }
  .header .btn-primary { padding: 10px 20px; font-size: 14px; }
}

/* 手机/小平板（<= 768px） */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }
  .container { padding: 0 20px; }
  .header-inner { padding: 0 20px; }

  /* 移动菜单 */
  .nav-main { display: none; }
  .menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px; height: 40px;
    padding: 0;
    z-index: 20;
  }
  .menu-toggle span {
    width: 22px; height: 2px;
    margin: 3px 0;
    transition: all var(--transition-normal);
    transform-origin: center;
  }
  .menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  .nav-main.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height); left: 0; right: 0;
    bottom: 0;
    z-index: 1100;
    background: #ffffff;
    padding: 16px 20px;
    border-top: 1px solid var(--color-border);
    align-items: stretch;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0;
  }
  .nav-main.open .nav-item {
    padding: 14px 12px;
    font-size: 16px;
    color: var(--color-text);
    border-radius: var(--radius-md);
    min-height: 48px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
  }
  .nav-main.open .nav-item.has-sub {
    flex-wrap: wrap;
  }
  .nav-main.open .nav-item.has-sub::after {
    margin-left: auto;
    transition: transform var(--transition-fast);
  }
  .nav-main.open .nav-submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin: 4px 0 8px;
    box-shadow: none;
    background: var(--color-bg-3);
    border: none;
    width: 100%;
    flex-basis: 100%;
  }
  .nav-main.open .nav-submenu a {
    padding: 12px 16px;
    min-height: 44px;
    display: flex;
    align-items: center;
  }
  .header .btn-primary {
    padding: 8px 16px;
    font-size: 13px;
  }
  .logo-sub { display: none; }

  /* Hero 移动端优化：按宽度比例缩放，保持与原图相同的 3:2 比例 */
  .hero {
    min-height: auto;
    padding-top: var(--header-height);
  }
  .hero-slider {
    height: auto;
    aspect-ratio: 3 / 2;
    min-height: 360px;
    max-height: 560px;
  }
  .hero-content-wrap {
    padding: 32px 20px 0;
    align-items: flex-start;
  }
  .hero-text { max-width: 100%; }
  .hero-tag {
    padding: 5px 12px;
    font-size: 11px;
    margin-bottom: 12px;
  }
  .hero-title {
    font-size: clamp(22px, 6.5vw, 32px);
    margin-bottom: 12px;
    line-height: 1.2;
  }
  .hero-title br { display: inline; }
  .hero-desc { font-size: 14px; margin-bottom: 18px; max-width: 100%; }
  .hero-cta { gap: 10px; }
  .hero-cta .btn {
    padding: 10px 20px;
    font-size: 13px;
    min-height: 40px;
  }
  .hero-dots { bottom: 20px; gap: 8px; }
  .hero-dot { width: 28px; height: 3px; }
  .hero-dot.active { width: 40px; }
  .scroll-indicator { display: none; }

  /* 通用区块 */
  .section { padding: 64px 0; }
  .section-sm { padding: 48px 0; }
  .section-header { margin-bottom: 40px; }
  .section-tag { font-size: 12px; padding: 5px 14px; }
  .section-desc { font-size: 15px; }

  /* 网格 */
  .grid { gap: 16px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }

  /* 卡片 */
  .card { padding: 28px 24px; }
  .card-icon { width: 48px; height: 48px; font-size: 22px; margin-bottom: 20px; }
  .card-title { font-size: 19px; }

  /* 统计 */
  .stats { grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 48px; }
  .stat { padding: 24px 16px; }
  .stat-num { font-size: 36px; }
  .stat-label { font-size: 13px; }

  /* 时间线 */
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 32px; }
  .timeline-step { padding: 18px 10px; }
  .timeline-step-num { width: 28px; height: 28px; line-height: 28px; font-size: 13px; margin-bottom: 8px; }
  .timeline-step-name { font-size: 12px; }

  /* Logo墙 */
  .logo-wall { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .logo-item { height: 72px; font-size: 13px; }

  /* 课程 */
  .course-item {
    grid-template-columns: 48px 1fr;
    gap: 16px;
    padding: 18px 20px;
  }
  .course-num { font-size: 24px; }
  .course-name { font-size: 15px; }
  .course-detail { font-size: 13px; }
  .course-hours {
    grid-column: 1 / -1;
    justify-self: start;
    padding: 4px 12px;
    font-size: 12px;
  }

  /* Tab */
  .tabs { width: 100%; margin-bottom: 40px; }
  .tab {
    padding: 10px 18px;
    font-size: 14px;
    flex: 1;
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* CTA */
  .cta-section { padding: 28px 24px; border-radius: var(--radius-lg); }
  .cta-title { font-size: clamp(24px, 6vw, 32px); }
  .cta-desc { font-size: 15px; margin-bottom: 32px; }
  .cta-buttons { flex-direction: column; gap: 12px; align-items: stretch; }
  .cta-buttons .btn {
    width: 100%;
    min-height: 48px;
  }

  /* 页面横幅 */
  .page-banner { padding: calc(var(--header-height) + 60px) 0 50px; }
  .page-banner-title { font-size: clamp(28px, 7vw, 40px); margin-bottom: 16px; }
  .page-banner-desc { font-size: 15px; }

  /* 案例 */
  .case-card .case-thumb { height: 160px; }
  .case-info { padding: 22px; }
  .case-title { font-size: 16px; }

  /* 联系 */
  .contact-grid { gap: 16px; margin-top: 32px; }
  .contact-card { padding: 24px; gap: 16px; }
  .contact-icon { width: 42px; height: 42px; font-size: 18px; }
  .contact-info-title { font-size: 15px; }
  .contact-info-content { font-size: 14px; }

  /* 表单 */
  input, textarea, select {
    font-size: 16px !important; /* 防止 iOS 缩放 */
    min-height: 48px;
  }
  textarea { min-height: 120px; }
  button[type="submit"], .btn-primary[type="submit"] {
    min-height: 48px;
    width: 100%;
  }
  form > div[style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
  }

  /* 招聘 */
  .job-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
  }
  .job-title { font-size: 16px; }
  .job-meta { font-size: 13px; gap: 12px; flex-wrap: wrap; }
  .job-arrow { display: none; }

  /* 优势列表 */
  .feature-item {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 20px;
  }
  .feature-item .feature-check { margin-bottom: 4px; }
  .feature-text h4 { font-size: 16px; }

  /* Footer */
  .footer { padding: 56px 0 24px; margin-top: 56px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; margin-bottom: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; font-size: 12px; text-align: center; }

  /* 按钮 */
  .btn { min-height: 44px; padding: 11px 22px; font-size: 14px; }

  /* 浮动元素 */
  .scroll-indicator { display: none; }
}

/* 小屏手机（<= 480px） */
@media (max-width: 480px) {
  :root { --header-height: 56px; }
  .container { padding: 0 16px; }
  .header-inner { padding: 0 16px; }

  .logo { gap: 8px; font-size: 17px; }
  .logo-mark { width: 32px; height: 32px; font-size: 16px; }

  .section { padding: 48px 0; }
  .section-sm { padding: 36px 0; }
  .section-header { margin-bottom: 32px; }

  .grid { gap: 12px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat { padding: 20px 12px; }
  .stat-num { font-size: 30px; }
  .stat-label { font-size: 12px; }

  .timeline { grid-template-columns: 1fr; gap: 10px; }
  .logo-wall { grid-template-columns: 1fr 1fr; gap: 10px; }
  .logo-item { height: 64px; font-size: 12px; }

  .card { padding: 24px 20px; border-radius: var(--radius-md); }
  .card-title { font-size: 18px; }

  .course-list { gap: 12px; }
  .course-item {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px;
  }
  .course-num { font-size: 20px; }
  .course-name { font-size: 14px; }
  .course-detail { font-size: 12px; }

  .tabs { padding: 4px; gap: 2px; }
  .tab { padding: 10px 12px; font-size: 13px; }

  .cta-section { padding: 24px 20px; }
  .cta-title { font-size: 22px; }

  .hero-slider { min-height: 300px; max-height: 460px; aspect-ratio: 4 / 3; }
  .hero-title { font-size: clamp(20px, 6vw, 28px); }
  .hero-tag { font-size: 11px; padding: 5px 12px; }
  .hero-content-wrap { padding: 24px 16px 0; }

  .footer-bottom { font-size: 11px; }
}

/* 横屏手机（高度 < 500） */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-slider { min-height: 320px; max-height: 400px; aspect-ratio: 16 / 9; }
  .hero-title { font-size: clamp(20px, 4vw, 28px); margin-bottom: 10px; line-height: 1.2; }
  .hero-tag { margin-bottom: 10px; }
  .hero-desc { display: none; }
  .scroll-indicator { display: none; }
}

/* iPhone 安全区适配 */
@supports (padding: max(0px)) {
  .header {
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
  .footer-bottom {
    padding-bottom: max(16px, env(safe-area-inset-bottom));
  }
}

/* 减少动效（无障碍） */
@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;
  }
}

/* ==========================================================================
   工具类
   ========================================================================== */
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: 32px; }
.mt-6 { margin-top: 48px; }
.mt-8 { margin-top: 64px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }