/* ========== 全局基础（亮色主题） ========== */
:root {
  /* 主题色与表面色 */
  --primary: #6366f1;
  --primary-soft: rgba(99, 102, 241, 0.15);
  --accent: #06b6d4;
  --accent-green: #10b981;

  /* 文字与边框 */
  --text-main: #111827;
  /* 灰黑 */
  --text-sub: #6b7280;
  /* 次要灰 */
  --border-soft: #e5e7eb;
  /* 细浅边框 */

  /* 表面与阴影 */
  --bg-panel: rgba(255, 255, 255, 0.92);
  --bg-panel-soft: rgba(248, 250, 252, 0.95);
  /* #f8fafc */
  --radius-s: 10px;
  --radius-lg: 15px;
  --radius-xl: 26px;
  --shadow-soft: 0 12px 28px rgba(17, 24, 39, 0.12);
  --shadow-glow: 0 0 24px rgba(56, 189, 248, 0.28);
  /* 统一头像尺寸与环厚度 */
  --avatar-size: 64px;
  --avatar-ring: 2px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  scroll-behavior: smooth;
  /* background: radial-gradient(circle at top, #f9fafb 0, #f1f5f9 45%, #eef2ff 100%); */
  color: var(--text-main);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

body {
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 背景粒子 / 线条效果（亮色） */
.bg-noise {
  position: fixed;
  inset: -100px;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(56, 189, 248, 0.22), transparent 55%),
    radial-gradient(circle at 85% 60%, rgba(99, 102, 241, 0.18), transparent 55%),
    radial-gradient(circle at 40% 90%, rgba(16, 185, 129, 0.16), transparent 55%);
  opacity: 0.7;
  filter: blur(1px);
  z-index: -2;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(148, 163, 184, 0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.10) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.35;
  mask-image: radial-gradient(circle at center, black 0, transparent 80%);
  z-index: -3;
  pointer-events: none;
}

/* ========== 通用布局 ========== */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  margin-bottom: 32px;
  text-align: left;
}

.section-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.section-title {
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 0.98rem;
  color: var(--text-sub);
  max-width: 600px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: linear-gradient(90deg, #ffffff, #f8fafc);
  font-size: 0.8rem;
  color: var(--text-sub);
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: radial-gradient(circle, var(--accent-green) 0, transparent 60%);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.6);
}

/* ========== 顶部导航（亮色） ========== */
header {
  position: fixed;
  /* 改为fixed确保始终固定在顶部 */
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  /* 提高z-index确保在最上层 */
  backdrop-filter: blur(24px);
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.8));
  border-bottom: 1px solid var(--border-soft);
  transition: all 0.3s ease;
  transform: translateY(0);
  /* 确保初始位置正确 */
}

/* 滚动时顶部导航加阴影与更高不透明度 */
header.scrolled {
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.95));
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
  border-color: rgba(229, 231, 235, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  background: conic-gradient(from 190deg, #6366f1, #22d3ee, #22c55e, #6366f1);
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.logo-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 10px;
  background: radial-gradient(circle at 30% 0, rgba(248, 250, 252, 0.7), transparent 50%);
  opacity: 0.6;
  mix-blend-mode: screen;
}

.logo {
  display: inline-block;
  width: 32px;
  height: 32px;
  position: relative;
  flex-shrink: 0;
}

.logo-img {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 12px;
  object-fit: cover;
}

.logo-fallback {
  position: absolute;
  inset: 0;
  display: none;
}

.nav-title {
  font-weight: 600;
  font-size: 1rem;
}

.nav-sub {
  font-size: 0.72rem;
  color: var(--text-sub);
}

.nav-center {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
}

.nav-link {
  position: relative;
  padding: 6px 0;
  color: var(--text-sub);
  cursor: pointer;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent), var(--primary));
  transition: width 0.2s ease-out;
}

.nav-link:hover {
  color: #111827;
}

.nav-link:hover::after {
  width: 100%;
}

/* 当前页高亮 */
.nav-link.active {
  color: #111827;
}

.nav-link.active::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
}

.btn {
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  padding: 7px 16px;
  font-size: 0.84rem;
  cursor: pointer;
  background: #ffffff;
  color: var(--text-main);
  transition: all 0.18s ease-out;
}

.btn:hover {
  transform: translateY(-5px);
}

/* 键盘可达性：按钮与链接的焦点样式 */
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.nav-link:focus-visible,
.mobile-nav-link:focus-visible {
  outline: none;
  box-shadow: inset 0 -2px 0 var(--accent);
}

.btn-primary {
  border: none;
  color: #ff5473;
  background: rgba(255, 84, 115, 0.1);
}

/* .btn-primary:hover {
  transform: translateY(-1px) translateZ(0);
  box-shadow: 0 14px 40px rgba(56, 189, 248, 0.38);
} */

.mobile-nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: #fff;
}

/* ========== 首页 Hero ========== */
#home {
  padding-top: 100px;
  padding-bottom: 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 4fr);
  gap: 40px;
  align-items: center;
}

.hero-title {
  font-size: 2.4rem;
  line-height: 1.15;
  margin: 14px 0 12px;
}

.hero-highlight {
  background: linear-gradient(120deg, #22d3ee, #a855f7, #10b981);
  -webkit-background-clip: text;
  color: transparent;
  font-weight: 800;
}

.hero-desc {
  color: var(--text-sub);
  font-size: 0.98rem;
  max-width: 420px;
}

.hero-cta-row {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-meta {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.78rem;
  color: var(--text-sub);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-meta-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent-green);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

/* 右侧 Banner 卡（亮色） */
.hero-banner {
  position: relative;
  border-radius: 32px;
  padding: 18px;
  background:
    radial-gradient(circle at 10% 0, rgba(56, 189, 248, 0.22), rgba(255, 255, 255, 1)),
    radial-gradient(circle at 90% 90%, rgba(99, 102, 241, 0.22), transparent 55%);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.hero-banner-inner {
  border-radius: 24px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel);
  padding: 18px;
  position: relative;
  isolation: isolate;
}

.ai-wave {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.16), transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(99, 102, 241, 0.16), transparent 60%);
  mix-blend-mode: screen;
  opacity: 0.9;
  animation: pulse 5s infinite alternate ease-in-out;
  pointer-events: none;
  z-index: -1;
}

@keyframes pulse {
  0% {
    transform: scale(1) translate3d(0, 0, 0);
    opacity: 0.7;
  }

  100% {
    transform: scale(1.05) translate3d(0, -4px, 0);
    opacity: 1;
  }
}

.hero-banner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  margin-bottom: 14px;
  color: var(--text-sub);
}

.hero-banner-chip {
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel-soft);
  font-size: 0.76rem;
}

.hero-metric-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}

.metric-card {
  flex: 1;
  border-radius: 18px;
  padding: 10px 12px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  color: var(--text-sub);
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 600;
}

.metric-tag {
  font-size: 0.7rem;
  color: var(--accent);
}

.hero-business-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.business-card {
  position: relative;
  border-radius: 18px;
  padding: 10px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
  font-size: 0.76rem;
  transform-style: preserve-3d;
  cursor: pointer;
  overflow: hidden;
}

.business-card-title {
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.business-card-desc {
  color: var(--text-sub);
  font-size: 0.72rem;
}

.business-card-tag {
  position: absolute;
  bottom: 6px;
  right: 8px;
  font-size: 0.7rem;
  color: var(--accent);
  opacity: 0.9;
}

.business-card::before {
  content: "";
  position: absolute;
  width: 90px;
  height: 90px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.22), transparent 65%);
  top: -40px;
  left: -30px;
  opacity: 0;
  transition: opacity 0.25s ease-out;
}

.business-card:hover::before {
  opacity: 1;
}

/* 合作 Logo */
.partner-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 20px;
  font-size: 0.8rem;
}

.partner-pill {
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  padding: 6px 10px;
  background: #ffffff;
}

/* ========== About Us ========== */
.panel {
  border-radius: var(--radius-xl);
  padding: 22px 20px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel);
  box-shadow: var(--shadow-soft);
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 4fr);
  gap: 24px;
  align-items: flex-start;
}

.timeline {
  border-left: 1px dashed var(--border-soft);
  padding-left: 16px;
  margin-top: 8px;
  font-size: 0.85rem;
}

.timeline-item {
  margin-bottom: 10px;
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: radial-gradient(circle, #22d3ee, transparent 65%);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.5);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  font-size: 0.75rem;
}

.badge {
  border-radius: 999px;
  padding: 4px 10px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel-soft);
}

.grid-icons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
  font-size: 0.8rem;
}

.grid-item {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel-soft);
}

.grid-label {
  font-size: 0.76rem;
  color: var(--accent);
  margin-bottom: 4px;
}

/* ========== 学校专区 ========== */
.two-col {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 3fr);
  gap: 20px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  font-size: 0.75rem;
}

.tag {
  border-radius: 999px;
  padding: 4px 9px;
  background: #ffffff;
  border: 1px solid var(--border-soft);
  color: var(--accent);
}

.thumb-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.thumb {
  border-radius: 12px;
  height: 64px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.24), rgba(99, 102, 241, 0.38));
  position: relative;
  overflow: hidden;
  font-size: 0.7rem;
  padding: 6px;
  display: flex;
  align-items: flex-end;
  color: #111827;
}

.thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(120deg, rgba(255, 255, 255, 0.2), rgba(248, 250, 252, 0.7));
  mix-blend-mode: soft-light;
}

.thumb span {
  position: relative;
  z-index: 1;
}

/* 关键数据与就业 · 统计卡样式 2.0（提升质感、增强对比、增加悬停与响应式优化） */
.xiyou-card .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 12px;
}

/* 个性化强调色（不同卡片） */
.xiyou-card .stat-card:nth-child(1) {
  --stat-accent: #22d3ee;
}

/* 青 */
.xiyou-card .stat-card:nth-child(2) {
  --stat-accent: #a855f7;
}

/* 紫 */
.xiyou-card .stat-card:nth-child(3) {
  --stat-accent: #10b981;
}

/* 绿 */
.xiyou-card .stat-card:nth-child(4) {
  --stat-accent: #f59e0b;
}

/* 橙 */
.xiyou-card .stat-card:nth-child(5) {
  --stat-accent: #14b8a6;
}

/* 水绿 */
.xiyou-card .stat-card:nth-child(6) {
  --stat-accent: #ef4444;
}

/* 红 */

/* 卡片质感与布局 */
.xiyou-card .stat-card {
  position: relative;
  border-radius: 16px;
  min-height: 86px;
  padding: 10px 12px;
  border: 1px solid var(--border-soft);
  background:
    radial-gradient(circle at 12% -10%, rgba(56, 189, 248, 0.16), transparent 60%),
    linear-gradient(180deg, #f4f5f7, #e5e7eb);
  box-shadow: inset 0 8px 20px rgba(17, 24, 39, 0.04), 0 2px 10px rgba(17, 24, 39, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 轻微强调光晕 */
.xiyou-card .stat-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 120%, var(--stat-accent, #22d3ee), transparent 65%);
  opacity: 0.18;
  pointer-events: none;
}

/* 顶部高光层，提升通透感 */
.xiyou-card .stat-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0));
  mix-blend-mode: soft-light;
  pointer-events: none;
}

/* 数字：居中、粗字、良好对比 */
.xiyou-card .stat-value {
  position: relative;
  z-index: 1;
  font-size: 25px;
  font-weight: 800;
  color: #111827;
  letter-spacing: 0.02em;
  margin-bottom: 15px;
}

/* 标签：左下角，强调信息层级 */
.xiyou-card .stat-label {
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-size: 0.82rem;
  color: var(--text-sub);
  font-weight: 600;
}

/* 悬停：轻升起 + 增强光晕与边框色 */
.xiyou-card .stat-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 36px rgba(17, 24, 39, 0.12);
  border-color: rgba(56, 189, 248, 0.32);
}

.xiyou-card .stat-card:hover::before {
  opacity: 0.25;
}

/* 响应式优化 */
@media (max-width: 960px) {
  .xiyou-card .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .xiyou-card .stat-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .xiyou-card .stat-card {
    min-height: 96px;
  }

  .xiyou-card .stat-value {
    font-size: 2rem;
  }
}

/* ========== 课程 ========== */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.filter-chip {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  font-size: 0.78rem;
  background: #ffffff;
  cursor: pointer;
}

.filter-chip.active {
  border-color: transparent;
  color: #ffffff;
  background: radial-gradient(circle at 20% 0, #22d3ee, #6366f1 60%);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.28);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  font-size: 0.82rem;
}

.course-card {
  border-radius: 18px;
  padding: 12px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.course-title-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.course-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.chip-small {
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel-soft);
}

.course-meta {
  font-size: 0.72rem;
  color: var(--text-sub);
}

.course-footer {
  margin-top: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
}

/* ========== 孵化器 ========== */
.step-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  font-size: 0.8rem;
}

.step-item {
  border-radius: 16px;
  padding: 10px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
}

.step-index {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.resource-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  font-size: 0.8rem;
  margin-top: 14px;
}

.resource-item {
  border-radius: 16px;
  padding: 10px 11px;
  border: 1px solid var(--border-soft);
  background: var(--bg-panel-soft);
}

/* ========== 团队 ========== */
.team-grid {
  display: grid;
  grid-template-columns: minmax(0, 2.2fr) minmax(0, 3.8fr);
  gap: 20px;
}

.team-main {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 16px 14px;
  border: 1px solid var(--border-soft);
  background: linear-gradient(180deg, #ffffff, var(--bg-panel));
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  min-height: 190px;
}

.team-main::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  pointer-events: none;
  background-image:
    radial-gradient(circle at 8% -10%, rgba(34, 211, 238, 0.14), transparent 55%),
    radial-gradient(circle at 92% 110%, rgba(99, 102, 241, 0.12), transparent 60%);
  opacity: 0.6;
}

.team-main:hover {
  box-shadow: 0 18px 40px rgba(17, 24, 39, 0.14);
  border-color: rgba(56, 189, 248, 0.32);
}

/* 创始人 2x2 栅格（窄屏降为 1 列） */
.founders-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.avatar-placeholder {
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 999px;
  padding: var(--avatar-ring);
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 30% 0, #f3f4f6, #ffffff);
  box-shadow: 0 6px 18px rgba(17, 24, 39, 0.08);
  flex-shrink: 0;
  /* 防止在 flex 布局中被压缩导致尺寸不一致 */
}

/* 渐变环装饰，增强识别度 */
.avatar-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  padding: var(--avatar-ring);
  /* background: conic-gradient(from 180deg, #22d3ee, #6366f1, #10b981, #22d3ee); */
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.avatar-inner {
  width: 100%;
  height: 100%;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 0, #e5e7eb, #f8fafc);
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.avatar-inner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(248, 250, 252, 0.8), rgba(255, 255, 255, 0));
  transform: translateX(-100%);
  animation: avatarShimmer 1.2s ease-in-out infinite;
}

.avatar-inner.loaded::after {
  display: none;
}

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  object-fit: cover;
  display: block;
  opacity: 0;
  transform: scale(1.02);
  filter: blur(6px);
  transition: opacity 0.28s ease-out, transform 0.28s ease-out, filter 0.28s ease-out;
}

.avatar-inner.loaded .avatar-img {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

.avatar-fallback {
  display: none;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #111827;
  background: conic-gradient(from 160deg, #f8fafc, #e5e7eb, #ffffff);
  border: none;
}

/* 头像悬停与渐变环动画 */
.avatar-placeholder:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(17, 24, 39, 0.12);
}

.avatar-placeholder::before {
  transform: rotate(0deg);
}

.avatar-placeholder:hover::before {
  animation: avatarRingSpin 1.6s linear infinite;
}

@keyframes avatarRingSpin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* 细腻内阴影，提升质感 */
.avatar-inner {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

@keyframes avatarShimmer {
  0% {
    transform: translateX(-100%);
  }

  100% {
    transform: translateX(100%);
  }
}

.team-main-head {
  display: flex;
  gap: 14px;
  align-items: center;
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 1px dashed var(--border-soft);
}

.team-main-name {
  font-weight: 700;
  font-size: 1rem;
}

.team-main-role {
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 2px;
  letter-spacing: 0.02em;
}

.team-main-desc {
  font-size: 0.76rem;
  color: var(--text-sub);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 查看更多链接样式 */
.team-more {
  margin-top: 6px;
}

.link-more {
  font-size: 0.78rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.link-more::after {
  content: '›';
  transition: transform 0.18s ease-out;
}

.link-more:hover::after {
  transform: translateX(2px);
}

.team-sub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  font-size: 0.8rem;
}

.team-card {
  border-radius: var(--radius-lg);
  padding: 10px 11px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
}

.team-card-title {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 3px;
}

.team-card-meta {
  font-size: 0.72rem;
  color: var(--text-sub);
}

/* ========== FAQ & 底部（亮色） ========== */
.faq {
  margin-top: 16px;
  border-radius: 18px;
  border: 1px solid var(--border-soft);
  padding: 12px 14px;
  background: var(--bg-panel-soft);
  font-size: 0.8rem;
}

.faq-item+.faq-item {
  margin-top: 8px;
}

footer {
  padding: 24px 0 30px;
  border-top: 1px solid var(--border-soft);
  margin-top: 40px;
  background: radial-gradient(circle at top, rgba(255, 255, 255, 0.95), rgba(248, 250, 252, 1));
  border-radius: var(--radius-s);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2.8fr) minmax(0, 3.2fr);
  gap: 18px;
  font-size: 0.78rem;
  color: var(--text-sub);
}

.qr-row {
  display: flex;
  gap: 12px;
}

.qr-box {
  width: 130px;
  border-radius: 14px;
  border: 1px dashed var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-sub);
  background: #ffffff;
  flex-direction: column;
}

.qr-box span {
  margin-bottom: 10px;
}

/* 3D hover 通用标记（亮色阴影） */
.card-3d {
  transform-style: preserve-3d;
  transition: transform 0.18s ease-out, box-shadow 0.18s ease-out, border-color 0.18s ease-out;
}

.card-3d:hover {
  box-shadow: 0 18px 40px rgba(17, 24, 39, 0.14);
  border-color: rgba(56, 189, 248, 0.32);
}

/* ========== 响应式 ========== */
@media (max-width: 960px) {

  .hero-grid,
  .about-layout,
  .two-col,
  .course-grid,
  .step-flow,
  .resource-list,
  .team-grid,
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .course-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid {
    gap: 24px;
  }

  .hero-banner {
    order: -1;
  }
}

@media (max-width: 720px) {

  .nav-center,
  .nav-right .btn {
    display: none;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .hero-title {
    font-size: 1.9rem;
  }

  .course-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  section {
    padding: 60px 0;
  }

  #home {
    padding-top: 66px;
  }
}

.mobile-nav-menu {
  display: none;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
  padding: 10px 0;
  font-size: 0.86rem;
  border-top: 1px solid var(--border-soft);
}

.mobile-nav-menu.open {
  display: flex;
}

.mobile-nav-link {
  padding: 6px 0;
  color: var(--text-sub);
}

.mobile-nav-link:hover {
  color: #111827;
}

/* founders 在移动端改为单列 */
@media (max-width: 720px) {
  .founders-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* 团队区布局：上排3位创始人，第二排继续1位创始人 + 2个核心团队卡片 */
.team-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.founders-grid,
.team-sub-grid {
  display: contents;
}

/* 两列核心团队：每列纵向两行 */
.team-col {
  display: grid;
  grid-template-rows: repeat(2, minmax(0, auto));
  gap: 10px;
}

/* 响应式：中屏 2 列，小屏 1 列 */
@media (max-width: 960px) {
  .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .team-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ========== 西邮卡片（xiyou） ========== */
#xiyou .section-title {
  font-size: 2.2rem;
  letter-spacing: 0.01em;
}

@media (max-width: 720px) {
  #xiyou .section-title {
    font-size: 2rem;
  }
}

.xiyou-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.xiyou-card {
  border-radius: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border-soft);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.xiyou-card-title {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 8px;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.xiyou-card-title .icon {
  font-size: 1.15rem;
  color: var(--accent);
  opacity: 0.95;
}

.xiyou-card-body {
  font-size: 0.8rem;
  color: var(--text-sub);
  line-height: 1.65;
  padding-left: 18px;
}

/* 兼容 body 为 div 的情况，避免额外缩进 */
.xiyou-card .xiyou-card-body:not(ul) {
  padding-left: 0;
}

.xiyou-card-body li {
  margin-bottom: 6px;
}

/* 列表图标替换（仅西邮区块） */
#xiyou .xiyou-card-body {
  list-style: none;
  padding-left: 0;
}

#xiyou .xiyou-card-body li {
  position: relative;
  padding-left: 22px;
}

#xiyou .xiyou-card-body li::before {
  content: "\f058";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  /* 使用 solid 图标 */
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--accent);
  font-size: 0.85rem;
  line-height: 1;
}

.xiyou-card-note {
  font-size: 0.78rem;
  color: var(--text-sub);
  margin-top: 8px;
}

@media (max-width: 960px) {
  .xiyou-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .xiyou-card-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}