/* 自闭症家庭干预平台 — 教育平台 UI 设计规范 */
:root {
  /* 主色：沉稳、可信赖的蓝绿色（教育/成长感） */
  --color-primary: #0d9488;
  --color-primary-dark: #0f766e;
  --color-primary-light: #ccfbf1;
  --color-primary-bg: #f0fdfa;
  /* 辅助色：温暖、行动号召（学习进度/完成/会员） */
  --color-accent: #ea580c;
  --color-accent-light: #ffedd5;
  --color-accent-hover: #c2410c;
  /* 成功/成长（完成、通过） */
  --color-success: #059669;
  --color-success-light: #d1fae5;
  /* 文字 */
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  /* 背景 */
  --color-bg: #f8fafc;
  --color-bg-warm: #fffbeb;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  /* 圆角与阴影 */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow: 0 4px 12px rgba(13, 148, 136, 0.08);
  --shadow-md: 0 8px 24px rgba(13, 148, 136, 0.1);
  /* 字体 */
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-size-xs: 0.8rem;
  --font-size-sm: 0.9rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --line-height-tight: 1.4;
  --line-height-normal: 1.6;
}

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

body {
  font-family: var(--font);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height-normal);
  min-height: 100vh;
}

/* ========== 光标与交互特效 ========== */
a,
button,
.btn,
.quick-item,
.course-card,
.resource-card,
.list-item,
.teacher-card,
[role="button"] {
  cursor: pointer;
}

/* 悬停时轻微放大与阴影 */
.quick-item:hover,
.course-card:hover,
.resource-card:hover {
  cursor: pointer;
}

.btn:hover,
.btn:focus-visible {
  cursor: pointer;
}

/* 可点击元素获得焦点时的外环（无障碍） */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.quick-item:focus-visible,
.form-control:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 按钮/卡片按下时的轻微反馈 */
.btn:active {
  transform: scale(0.98);
}

.quick-item:active {
  transform: translateY(-1px) scale(0.99);
}

.course-card:active,
.resource-card:active {
  transform: translateY(0) scale(0.99);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ========== 顶部导航（教育平台品牌感） ========== */
.nav {
  background: var(--color-card);
  box-shadow: var(--shadow-sm);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-border-light);
}

.nav-brand {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-brand a {
  color: inherit;
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .nav-top .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-card);
    flex-direction: column;
    padding: 16px;
    gap: 12px;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow);
  }
  .nav-top .nav-links.open {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
}

/* 首页区块卡片（教师、游戏等） */
.home-section-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.home-card {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.home-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--color-text);
}

.home-card-title {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}

.home-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  line-height: 1.45;
}

.home-card-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .home-section-cards {
    grid-template-columns: 1fr;
  }
}

/* ========== 页面容器与区块标题 ========== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px;
}

@media (max-width: 480px) {
  .container {
    padding: 16px 12px;
  }
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* 教育平台分区标题：带图标或左侧色条 */
.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 1.2em;
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-pill);
}

/* 首页各栏目区块与“更多”链接 */
.home-section {
  margin-bottom: 32px;
}
.home-section .section-title {
  margin-bottom: 16px;
}
.section-more {
  text-align: center;
  margin-top: 16px;
  margin-bottom: 0;
}
.section-more .btn {
  min-width: 140px;
}

/* 占位卡片（无数据或接口失败时展示，保持布局一致） */
.course-card--placeholder,
.home-card--placeholder {
  pointer-events: none;
  opacity: 0.92;
}
.home-card--teacher {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.home-teacher-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 8px;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: background 0.2s, transform 0.08s, box-shadow 0.2s, border-color 0.2s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: #fff;
  box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.35);
}

.btn-secondary {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-primary-bg);
  border-color: var(--color-primary);
  text-decoration: none;
}

.btn-block {
  width: 100%;
}

/* ========== 卡片 ========== */
.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 16px;
  border: 1px solid var(--color-border-light);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ========== 首页 Hero（教育平台主视觉） ========== */
.hero {
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, #0c4a4e 100%);
  color: #fff;
  padding: 40px 28px;
  border-radius: var(--radius);
  margin-bottom: 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 80%, rgba(255,255,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero h1 {
  font-size: clamp(1.15rem, 4vw, var(--font-size-2xl));
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  position: relative;
  line-height: 1.35;
}

.hero p {
  opacity: 0.95;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  position: relative;
}

.hero .hero-buttons {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.hero .hero-buttons .btn {
  min-width: 140px;
}

/* ========== 快捷入口网格（学习中心入口） ========== */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

@media (max-width: 480px) {
  .quick-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
}

.quick-item {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow 0.2s, transform 0.08s, border-color 0.2s;
  border: 1px solid var(--color-border-light);
}

.quick-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  text-decoration: none;
  color: var(--color-text);
  border-color: var(--color-primary-light);
}

.quick-item .icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 12px;
  background: var(--color-primary-bg);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quick-item .icon .ico {
  color: var(--color-primary);
}

.quick-item .label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

/* ========== 课程/资源列表卡片 ========== */
.course-list,
.resource-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}

@media (max-width: 600px) {
  .course-list,
  .resource-list {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

.course-card,
.resource-card {
  background: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: box-shadow 0.2s, transform 0.08s;
  border: 1px solid var(--color-border-light);
}

.course-card:hover,
.resource-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
  color: inherit;
}

.course-card .cover,
.resource-card .cover {
  height: 150px;
  background: linear-gradient(145deg, var(--color-primary-bg), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.course-card .cover img,
.resource-card .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-card .cover .ico,
.resource-card .cover .ico {
  color: var(--color-primary);
}

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

.course-card .tag,
.resource-card .tag {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
  display: inline-block;
  font-weight: 500;
}

/* 通用标签（详情页、表单等） */
.tag {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
  display: inline-block;
  font-weight: 500;
}

/* 免费 / 会员 标记：绿色=免费，橙色=付费/会员 */
.tag--free {
  color: #059669;
  background: #ecfdf3;
}
.tag--paid {
  color: #ea580c;
  background: #fff7ed;
}

/* ========== 表单 ========== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

/* ========== 底部导航（移动端/教育平台统一） ========== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-card);
  box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.06);
  display: flex;
  justify-content: space-around;
  padding: 12px 0;
  z-index: 99;
  border-top: 1px solid var(--color-border-light);
}

.bottom-nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.bottom-nav .nav-txt {
  font-size: 0.7rem;
}

.bottom-nav a:hover,
.bottom-nav a.active {
  color: var(--color-primary);
  text-decoration: none;
}

.bottom-nav .icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.bottom-nav .icon .ico {
  color: inherit;
}

body.has-bottom-nav {
  padding-bottom: 72px;
}

/* ========== 会员/标签角标 ========== */
.badge-vip {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: #fff;
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  margin-left: 8px;
}

/* ========== 列表项 ========== */
.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 4px;
  border-bottom: 1px solid var(--color-border-light);
  text-decoration: none;
  color: var(--color-text);
}

.card .list-item:first-of-type {
  padding-top: 0;
}

.list-item:last-child {
  border-bottom: none;
}

.list-item:hover {
  color: var(--color-primary);
}

/* ========== 进度条 ========== */
.progress-bar {
  height: 8px;
  background: var(--color-border-light);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-success));
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

/* 计划进度条按完成情况着色：绿=全部完成，蓝=70%+，橙=30%～70%，红=低于30% */
.progress-bar .fill.progress-fill--green { background: #059669; }
.progress-bar .fill.progress-fill--blue { background: #2563eb; }
.progress-bar .fill.progress-fill--orange { background: #ea580c; }
.progress-bar .fill.progress-fill--red { background: #dc2626; }

/* ========== 教育平台专用：提示框 ========== */
.notice {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.6;
}

.notice strong {
  color: var(--color-primary);
}

/* ========== 筛选/标签栏（课程、资源用） ========== */
.filter-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.filter-bar .btn {
  padding: 10px 18px;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-pill);
}

.filter-bar .btn-primary {
  border: none;
}

/* ========== 学习路径/步骤条样式（可选） ========== */
.learning-path {
  background: var(--color-bg-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 28px;
}

.learning-path .path-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.learning-path .path-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}