/* ========== 亲自然（Biophilic）全宽设计系统 ========== */
:root {
  --moss: #4a7c59;
  --moss-light: #6b9e7a;
  --moss-dark: #3a6347;
  --leaf: #7cb342;
  --leaf-light: #aed581;
  --leaf-bg: #f1f8e9;
  --earth: #8d6e63;
  --earth-light: #a1887f;
  --earth-bg: #efebe9;
  --sky: #64b5f6;
  --sky-bg: #e3f2fd;
  --sun: #ffd54f;
  --warmth: #fff8e1;

  --text-primary: #2e3a2e;
  --text-secondary: #5a6b5a;
  --text-muted: #8a9b8a;
  --bg-body: #f6f9f2;
  --bg-white: #ffffff;
  --bg-card: #fafcf7;
  --border: #e2ebe0;
  --border-light: #edf3ea;

  --shadow-sm: 0 1px 3px rgba(74,124,89,0.06);
  --shadow: 0 2px 8px rgba(74,124,89,0.08);
  --shadow-md: 0 4px 16px rgba(74,124,89,0.1);
  --shadow-lg: 0 8px 32px rgba(74,124,89,0.12);

  --radius: 16px;
  --radius-sm: 12px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --nav-h: 72px;
  --content-max: 1280px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 180ms cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* 微噪点纸纤维质感 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E");
  z-index: -1;
  pointer-events: none;
}

main { flex: 1; }

a { color: var(--moss); text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.hidden { display: none !important; }

/* ========== 顶部导航 ========== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: box-shadow 0.3s var(--ease);
}

.site-nav.scrolled { box-shadow: var(--shadow); }

.nav-container {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 48px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--moss);
  flex-shrink: 0;
}

.nav-brand i { font-size: 24px; color: var(--leaf); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 48px;
  flex: 1;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 20px;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--moss);
  background: var(--leaf-bg);
}

.nav-link.active {
  color: var(--moss);
  background: var(--leaf-bg);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
  box-shadow: 0 3px 12px rgba(74,124,89,0.25);
}

.nav-cta:hover { transform: scale(1.04); box-shadow: 0 5px 18px rgba(74,124,89,0.3); }
.nav-cta:active { transform: scale(0.98); }

/* ========== Hero 区 ========== */
.hero-section {
  position: relative;
  padding-top: calc(var(--nav-h) + 80px);
  padding-bottom: 0;
  background: linear-gradient(170deg, #ffffff 0%, #f0f7ec 40%, #e8f5e1 100%);
  overflow: hidden;
}

.hero-container {
  display: flex;
  align-items: center;
  gap: 60px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 48px 80px;
}

.hero-text {
  flex: 1;
  max-width: 560px;
}

.hero-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.hero-tags span {
  font-size: 13px;
  font-weight: 600;
  color: var(--moss);
  letter-spacing: 0.5px;
}

.hero-tags .dot {
  color: var(--leaf-light);
  font-size: 16px;
}

.hero-title {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 40px;
}

.btn-hero-primary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border: none;
  border-radius: 28px;
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(74,124,89,0.3);
}

.btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(74,124,89,0.35); }
.btn-hero-primary:active { transform: translateY(0); }

.btn-hero-outline {
  padding: 14px 32px;
  border: 2px solid var(--border);
  border-radius: 28px;
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.btn-hero-outline:hover {
  border-color: var(--moss-light);
  color: var(--moss);
  background: var(--leaf-bg);
}

.hero-stats {
  display: flex;
  gap: 36px;
}

.hero-stat { text-align: left; }

.hero-stat-num {
  display: block;
  font-size: 36px;
  font-weight: 900;
  color: var(--moss);
  line-height: 1.1;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero 右侧视觉 */
.hero-visual {
  flex: 1.2;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 520px;
}

.hero-blob {
  width: 520px;
  height: 520px;
  border-radius: 60% 40% 50% 50% / 50% 60% 40% 50%;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(74,124,89,0.2);
  animation: blobFloat 8s ease-in-out infinite;
}

.hero-blob img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes blobFloat {
  0%, 100% { border-radius: 60% 40% 50% 50% / 50% 60% 40% 50%; transform: translateY(0); }
  33% { border-radius: 50% 60% 40% 60% / 60% 40% 60% 40%; transform: translateY(-8px); }
  66% { border-radius: 40% 50% 60% 40% / 40% 50% 50% 60%; transform: translateY(4px); }
}

/* 装饰元素 */
.hero-deco {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero-deco-1 {
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(124,179,66,0.15), transparent 70%);
  top: 20px;
  right: 40px;
}

.hero-deco-2 {
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(100,181,246,0.12), transparent 70%);
  bottom: 40px;
  left: 20px;
}

.hero-deco-3 {
  width: 60px;
  height: 60px;
  background: radial-gradient(circle, rgba(255,213,79,0.15), transparent 70%);
  top: 60%;
  right: 10%;
}

/* 波浪分隔 */
.wave-divider {
  position: relative;
  margin-top: -1px;
}

.wave-divider svg {
  display: block;
  width: 100%;
  height: 80px;
}

/* ========== 通用区块 ========== */
.section {
  padding: 80px 0;
}

.section-container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 48px;
}

.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 16px;
  background: var(--leaf-bg);
  color: var(--moss);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 36px;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* 交替背景 */
.section-cases { background: var(--bg-white); }
.section-resources { background: var(--bg-white); }
.section-ai { background: linear-gradient(180deg, var(--bg-body), #edf5e8); }

/* ========== 六大能力模块 ========== */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.module-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: 4px 4px 0 0;
  transition: var(--transition);
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--leaf-light);
}

.module-card:hover::before { height: 5px; }
.module-card:active { transform: translateY(-2px); }

.module-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}

.module-card-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.module-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.module-card-progress {
  height: 5px;
  background: var(--border-light);
  border-radius: 3px;
  overflow: hidden;
}

.module-card-progress-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 1s var(--ease);
}

.module-card-progress-text {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 600;
}

/* ========== 案例网格 ========== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.case-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: var(--transition);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.case-card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

img.case-card-img { display: block; }

.case-card:hover .case-card-img,
.case-card:hover img.case-card-img {
  transform: scale(1.05);
}

.case-card-body { padding: 16px 18px; }

.case-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-card-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ========== 课程横向滚动 ========== */
.courses-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding-bottom: 12px;
  scrollbar-width: thin;
}

.courses-scroll::-webkit-scrollbar { height: 6px; }
.courses-scroll::-webkit-scrollbar-track { background: var(--border-light); border-radius: 3px; }
.courses-scroll::-webkit-scrollbar-thumb { background: var(--moss-light); border-radius: 3px; }

.course-card {
  flex: 0 0 300px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: var(--transition);
}

.course-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.course-card-thumb {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: #fff;
}

.course-card-body { padding: 16px 18px; }

.course-card-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.course-card-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.course-card-tags { display: flex; gap: 6px; }

.course-tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.tag-video { background: var(--warmth); color: #8d6e63; }
.tag-article { background: var(--leaf-bg); color: var(--moss-dark); }
.tag-practice { background: var(--sky-bg); color: #1565c0; }

/* ========== AI聊天区 ========== */
.ai-chat-wrapper {
  max-width: 720px;
  margin: 0 auto;
}

.ai-chat-box {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.ai-chat-box .ai-quick-actions {
  display: flex;
  gap: 8px;
  padding: 18px 24px 12px;
  overflow-x: auto;
  scrollbar-width: none;
}

.ai-chat-box .ai-quick-actions::-webkit-scrollbar { display: none; }

.ai-chat-box .ai-quick-actions button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}

.ai-chat-box .ai-quick-actions button:hover {
  border-color: var(--moss-light);
  color: var(--moss);
  background: var(--leaf-bg);
}

.ai-chat-box .chat-messages {
  height: 360px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 24px;
  scrollbar-width: thin;
}

.ai-chat-box .chat-input-area {
  padding: 12px 24px 18px;
  border-top: 1px solid var(--border-light);
}

.chat-input-wrapper {
  display: flex;
  gap: 10px;
  align-items: center;
}

.chat-input-wrapper input {
  flex: 1;
  padding: 12px 20px;
  border: 1px solid var(--border);
  border-radius: 24px;
  font-size: 14px;
  outline: none;
  transition: var(--transition);
  background: var(--bg-card);
  color: var(--text-primary);
}

.chat-input-wrapper input:focus {
  border-color: var(--moss-light);
  background: var(--bg-white);
  box-shadow: 0 0 0 3px rgba(74,124,89,0.08);
}

.btn-send {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: var(--transition);
  flex-shrink: 0;
  box-shadow: 0 3px 10px rgba(74,124,89,0.25);
}

.btn-send:hover { transform: scale(1.08); }

/* 聊天消息 */
.chat-msg {
  display: flex;
  gap: 10px;
  max-width: 80%;
  animation: msgIn 0.35s var(--ease);
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-msg.ai { align-self: flex-start; }
.chat-msg.user { align-self: flex-end; flex-direction: row-reverse; }

.chat-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
}

.chat-msg.ai .chat-msg-avatar {
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  color: #fff;
}

.chat-msg.user .chat-msg-avatar {
  background: var(--earth-bg);
  color: var(--earth);
}

.chat-msg-bubble {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-msg.ai .chat-msg-bubble {
  background: var(--bg-card);
  color: var(--text-primary);
  border-top-left-radius: 4px;
  border: 1px solid var(--border-light);
}

.chat-msg.user .chat-msg-bubble {
  background: linear-gradient(135deg, var(--moss), var(--moss-light));
  color: #fff;
  border-top-right-radius: 4px;
}

.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 4px 0;
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss-light);
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--text-primary);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
  text-align: center;
}

.footer-container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 48px;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand i { color: var(--leaf); }

.footer-desc {
  font-size: 14px;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover { color: #fff; }

.footer-copy {
  font-size: 13px;
  opacity: 0.5;
}

/* ========== 模态框 ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(46,58,46,0.4);
  z-index: 2000;
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.modal-overlay:not(.hidden) {
  opacity: 1;
}

.modal-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  width: 92%;
  max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  z-index: 2001;
  box-shadow: 0 24px 80px rgba(46,58,46,0.18);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s var(--ease);
}

.modal-panel:not(.hidden) {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-light);
}

.modal-header h3 { font-size: 16px; font-weight: 700; }

.btn-close-modal {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--leaf-bg);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
}

.btn-close-modal:hover { background: #e8f5e9; }
.modal-body { padding: 24px; }

/* ========== Toast ========== */
.toast-container {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3000;
}

.toast {
  background: var(--moss-dark);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  box-shadow: var(--shadow-md);
  font-size: 14px;
  font-weight: 500;
  animation: toastIn 0.3s var(--ease), toastOut 0.3s var(--ease) 2.7s forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateY(-8px); }
}

/* ========== 首页导航卡片 ========== */
.home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.home-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

.home-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--leaf-light);
}

.home-card-icon {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 18px;
}

.home-card h3 {
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.home-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.home-card-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--leaf-bg);
  color: var(--moss);
  margin-top: 16px;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.home-card:hover .home-card-arrow {
  background: var(--moss);
  color: #fff;
  transform: translateX(4px);
}

/* ========== 子页面头部 ========== */
.page-hero {
  padding-top: calc(var(--nav-h) + 48px);
  padding-bottom: 48px;
  background: linear-gradient(170deg, #ffffff 0%, #f0f7ec 40%, #e8f5e1 100%);
  text-align: center;
}

.page-hero .section-container { max-width: var(--content-max); margin: 0 auto; padding: 0 48px; }

.page-hero .section-tag { margin-bottom: 12px; }

.page-hero .section-title {
  font-size: 42px;
  margin-bottom: 12px;
}

.page-hero .section-subtitle {
  font-size: 17px;
  max-width: 600px;
}

/* ========== 滚动揭示 ========== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ========== 详情页样式（模态框内） ========== */
img.detail-cover {
  display: block;
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
}

.detail-title { font-size: 20px; font-weight: 800; margin-bottom: 10px; }

.detail-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.detail-meta i { margin-right: 4px; }

.detail-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.btn-primary {
  padding: 10px 22px;
  border-radius: 22px;
  border: none;
  background: linear-gradient(135deg, var(--moss), var(--leaf));
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 3px 12px rgba(74,124,89,0.25);
}

.btn-primary:hover { transform: scale(1.04); }

.btn-outline {
  padding: 10px 22px;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-outline:hover { border-color: var(--moss-light); color: var(--moss); }

.detail-section { margin-bottom: 20px; }

.detail-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.detail-section p,
.detail-section ul {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.detail-section ul { padding-left: 20px; }
.detail-section li { margin-bottom: 5px; }

/* ========== 移动端汉堡菜单 ========== */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  border-radius: 12px;
  transition: var(--transition);
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle:hover {
  background: var(--leaf-bg);
  color: var(--moss);
}

/* ========== 跳转到内容（无障碍） ========== */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 12px 24px;
  background: var(--moss);
  color: #fff;
  border-radius: 0 0 12px 12px;
  font-size: 14px;
  font-weight: 700;
  z-index: 10000;
  transition: top 0.3s var(--ease);
}

.skip-to-content:focus {
  top: 0;
  color: #fff;
}

/* ========== 键盘焦点样式 ========== */
*:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
  border-radius: 4px;
}

.nav-link:focus-visible,
.btn-hero-primary:focus-visible,
.btn-hero-outline:focus-visible,
.btn-primary:focus-visible,
.btn-outline:focus-visible,
.nav-cta:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
}

.btn-close-modal:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
}

/* ========== 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;
  }
  html { scroll-behavior: auto; }
  .hero-blob { animation: none; }
  .reveal { opacity: 1; transform: none; }
}

/* ========== 打印样式 ========== */
@media print {
  .site-nav, .site-footer, .nav-toggle, .skip-to-content,
  .modal-overlay, .modal-panel, .toast-container,
  .hero-actions, .btn-primary, .btn-outline,
  .ai-quick-actions, .chat-input-area { display: none !important; }
  body { background: #fff; color: #000; }
  .hero-section, .page-hero { background: #fff !important; padding-top: 20px !important; }
  .section { padding: 20px 0; }
  a { color: #000; text-decoration: underline; }
  .home-card, .module-card, .case-card, .course-page-card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
}

/* ========== 屏幕阅读器辅助 ========== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}