/* 首页 — 综合全站内容、图文与视频增强版 */

/* ========== Hero 主视觉 ========== */
.home-hero {
  background: linear-gradient(152deg, #0d9488 0%, #0f766e 38%, #0c4a4e 100%);
  color: #fff;
  border-radius: var(--radius);
  margin-bottom: 32px;
  overflow: hidden;
  position: relative;
}
.home-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 20%, rgba(255,255,255,0.12) 0%, transparent 50%),
              radial-gradient(ellipse 60% 80% at 20% 90%, rgba(255,255,255,0.06) 0%, transparent 45%);
  pointer-events: none;
}
.home-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 36px 24px 32px;
  position: relative;
}
@media (min-width: 720px) {
  .home-hero-inner {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 44px 40px 40px;
    min-height: 280px;
  }
}
.home-hero-text h1 {
  font-size: clamp(1.35rem, 4.5vw, 1.85rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.home-hero-text .hero-lead {
  font-size: var(--font-size-sm);
  opacity: 0.95;
  line-height: 1.65;
  margin-bottom: 20px;
}
.home-hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.home-hero-btns .btn {
  min-width: 140px;
}
.home-hero-btns .btn-primary {
  color: #fff;
  border: none;
}
.home-hero-btns .btn-ghost {
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}
.home-hero-btns .btn-ghost:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  color: #fff;
}
.home-hero-visual {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: rgba(0,0,0,0.18);
  background-image: url("../img/ndbi-hero-real-scene-1.png");
  background-size: cover;
  background-position: center right;
  background-repeat: no-repeat;
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}
@media (min-width: 720px) {
  .home-hero-visual { min-height: 220px; }
}
/* 使用真实场景照片时不再显示占位图标与文字，只保留照片 */
.home-hero-visual .visual-placeholder {
  display: none;
}
.home-hero-visual video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ========== 平台能做什么 ========== */
.home-features {
  margin-bottom: 40px;
}
.home-features h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
  text-align: center;
}
.home-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}
@media (min-width: 600px) {
  .home-features-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }
}
.home-feature-card {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.08s, border-color 0.2s;
}
.home-feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  border-color: var(--color-primary-light);
  color: var(--color-text);
  text-decoration: none;
}
.home-feature-card .icon-wrap {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  background: var(--color-primary-bg);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}
.home-feature-card .title {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}
.home-feature-card .desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.45;
}

/* ========== NDBI 介绍区块 ========== */
.home-ndbi {
  background: linear-gradient(135deg, var(--color-primary-bg) 0%, var(--color-bg-warm) 100%);
  border-radius: var(--radius);
  padding: 28px 24px;
  margin-bottom: 36px;
  border: 1px solid var(--color-border-light);
}
.home-ndbi-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}
@media (min-width: 640px) {
  .home-ndbi-inner {
    grid-template-columns: 120px 1fr;
    gap: 28px;
  }
}
.home-ndbi-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto;
  background: linear-gradient(145deg, var(--color-primary), var(--color-primary-dark));
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2.5rem;
  line-height: 1;
}
@media (min-width: 640px) {
  .home-ndbi-icon { margin: 0; width: 120px; height: 120px; font-size: 3rem; }
}
.home-ndbi-text h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}
.home-ndbi-text p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 12px;
}
.home-ndbi-text .ndbi-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.home-ndbi-text .ndbi-tags span {
  font-size: var(--font-size-xs);
  background: var(--color-card);
  color: var(--color-primary);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-primary-light);
}

/* ========== 精彩视频 / 推荐试看 ========== */
.home-video-section {
  margin-bottom: 40px;
}
.home-video-section h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.home-video-section h2::before {
  content: "";
  width: 4px;
  height: 1.2em;
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-pill);
}
.home-video-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  background: #1e293b;
  position: relative;
  aspect-ratio: 16/9;
  max-height: 360px;
}
.home-video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.home-video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.9);
  padding: 24px;
  text-align: center;
}
.home-video-placeholder .play-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(13, 148, 136, 0.9);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 16px;
  line-height: 1;
}
.home-video-placeholder .play-icon::after {
  content: "▶";
  margin-left: 4px;
}
.home-video-placeholder p {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}
.home-video-caption {
  margin-top: 12px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ========== 首页区块标题统一 ========== */
.home-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;
}
.home-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);
}
.home-section-more {
  text-align: center;
  margin-top: 18px;
}
.home-section-more .btn { min-width: 140px; }

/* ========== 推荐课程（增强卡片） ========== */
.home-courses {
  margin-bottom: 40px;
}
.home-course-card {
  display: block;
  background: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--color-border-light);
  transition: box-shadow 0.2s, transform 0.08s;
}
.home-course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
  text-decoration: none;
}
.home-course-card .cover {
  height: 140px;
  background: linear-gradient(145deg, var(--color-primary-bg), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  color: var(--color-primary);
}
.home-course-card .cover-plain {
  background: linear-gradient(145deg, #ecfdf5, #d1fae5);
}
.home-course-card .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.home-course-card .cover .play-badge {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 0.7rem;
  padding: 4px 8px;
  border-radius: 6px;
}
.home-course-card .body {
  padding: 16px;
}
.home-course-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);
  display: inline-block;
  margin-bottom: 8px;
  font-weight: 500;
}
.home-course-card .title {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: 6px;
  color: var(--color-text);
}
.home-course-card .desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========== 推荐教师（增强） ========== */
.home-teachers {
  margin-bottom: 40px;
}
.home-teacher-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, border-color 0.2s;
}
.home-teacher-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-primary-light);
  color: var(--color-text);
  text-decoration: none;
}
.home-teacher-card .avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin-bottom: 12px;
  background: var(--color-primary-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.75rem;
  line-height: 1;
}
.home-teacher-card img.avatar {
  object-fit: cover;
  display: block;
}
.home-teacher-card .name {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}
.home-teacher-card .intro {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.home-teacher-card .tags {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ========== 游戏与资源（增强） ========== */
.home-games {
  margin-bottom: 40px;
}
.home-game-card {
  display: block;
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 18px 16px;
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, border-color 0.2s;
}
.home-game-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-primary-light);
  color: var(--color-text);
  text-decoration: none;
}
.home-game-card .title {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: 6px;
  color: var(--color-text);
}
.home-game-card .meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.home-resources-download {
  margin-bottom: 40px;
}
.home-res-download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 880px) {
  .home-res-download-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.res-download-card {
  display: flex;
  align-items: flex-start;
  padding: 18px 16px;
  border-radius: var(--radius);
  background: var(--color-card);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}
.res-download-icon {
  width: 56px;
  height: 56px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-right: 16px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  flex-shrink: 0;
}
.res-download-icon-alt {
  background: #e0ecff;
  color: #2563eb;
}
.res-download-text h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}
.res-download-text p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
}
.res-download-link {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}
.res-download-link:hover {
  text-decoration: underline;
}
/* ========== 如何开始 ========== */
.home-steps {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  margin-bottom: 36px;
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}
.home-steps h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 24px;
  text-align: center;
}
.home-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 560px;
  margin: 0 auto;
}
@media (max-width: 520px) {
  .home-steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}
.home-step {
  text-align: center;
}
.home-step .num {
  width: 44px;
  height: 44px;
  margin: 0 auto 12px;
  background: linear-gradient(145deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
}
.home-step .label {
  font-weight: 600;
  font-size: var(--font-size-sm);
  margin-bottom: 4px;
  color: var(--color-text);
}
.home-step .hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* ========== 家长加油站 ========== */
.home-parent-care {
  margin-bottom: 40px;
  border-radius: var(--radius-lg);
  padding: 28px 20px 24px;
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.22), transparent 55%),
              radial-gradient(circle at bottom right, rgba(45, 212, 191, 0.16), transparent 55%),
              #0f172a;
  color: #e5e7eb;
}
@media (min-width: 768px) {
  .home-parent-care {
    padding: 32px 28px 28px;
  }
}
.home-parent-inner h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 8px;
  color: #f9fafb;
}
.home-parent-lead {
  font-size: var(--font-size-sm);
  color: #cbd5f5;
  margin-bottom: 16px;
  line-height: 1.7;
}
.home-parent-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 16px;
}
@media (min-width: 768px) {
  .home-parent-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.parent-card {
  padding: 16px 14px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.4);
}
.parent-card-accent {
  border-color: rgba(59, 130, 246, 0.9);
  background: rgba(15, 23, 42, 0.9);
}
.parent-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}
.parent-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: #e5e7eb;
  margin-bottom: 4px;
}
.parent-desc {
  font-size: var(--font-size-xs);
  color: #cbd5f5;
  line-height: 1.6;
}
.home-parent-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}
.home-parent-cta .btn {
  border-radius: 999px;
}

/* 今日任务浮动提醒（PC/H5） */
.home-task-float {
  position: fixed;
  right: 16px;
  bottom: 88px;
  z-index: 40;
  background: #0f172a;
  color: #e5e7eb;
  padding: 14px 18px;
  border-radius: 999px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  gap: 10px;
}
.home-task-float-main {
  font-size: 0.9rem;
}
.home-task-float-title {
  font-weight: 600;
}
.home-task-float-sub {
  font-size: 0.8rem;
  color: #9ca3af;
}
.home-task-float-btn {
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
  border: none;
  background: #f97316;
  color: #fff;
  cursor: pointer;
}
.home-task-float-close {
  margin-left: 4px;
  font-size: 1rem;
  cursor: pointer;
  color: #9ca3af;
}

/* ========== 底部 CTA ========== */
.home-cta {
  text-align: center;
  padding: 32px 24px;
  background: linear-gradient(145deg, var(--color-primary-bg) 0%, var(--color-card) 100%);
  border-radius: var(--radius);
  border: 1px solid var(--color-primary-light);
  margin-bottom: 24px;
}
.home-cta h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}
.home-cta p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}
.home-cta .btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.home-cta .btns .btn { min-width: 140px; }