/* ===== 课堂资料页样式 ===== */

:root {
  --cr-green: #45c779;
  --cr-green-soft: #e8f9ef;
  --cr-blue: #4168e6;
  --cr-blue-soft: #eef3ff;
  --cr-purple: #8a6dff;
  --cr-purple-soft: #f0ecff;
  --cr-orange: #ff914d;
  --cr-orange-soft: #fff3eb;
  --cr-text: #1f2a44;
  --cr-soft: #586680;
  --cr-card: rgba(255,255,255,.92);
  --cr-line: rgba(214,232,252,.96);
  --cr-radius: 20px;
  --cr-shadow: 0 18px 40px rgba(62, 116, 191, .13);
}

.cr-hidden { display: none !important; }

.cr-section { margin-top: 24px; }

/* ===== 课程选择卡片 ===== */
.cr-course-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.cr-course-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  border: 2px solid var(--cr-line);
  border-radius: var(--cr-radius);
  background: var(--cr-card);
  cursor: pointer;
  transition: all .25s ease;
  font-family: inherit;
  font-size: 15px;
  color: var(--cr-text);
  box-shadow: 0 4px 16px rgba(62,116,191,.06);
}

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

.cr-course-tab.active {
  border-color: var(--cr-blue);
  background: var(--cr-blue-soft);
  box-shadow: 0 6px 24px rgba(65,104,230,.18);
}

.cr-course-tab[data-course-id="phonics"].active { border-color: var(--cr-green); background: var(--cr-green-soft); }
.cr-course-tab[data-course-id="english-grammar"].active { border-color: var(--cr-blue); background: var(--cr-blue-soft); }
.cr-course-tab[data-course-id="chinese-reading"].active { border-color: var(--cr-purple); background: var(--cr-purple-soft); }
.cr-course-tab[data-course-id="chinese-writing"].active { border-color: var(--cr-orange); background: var(--cr-orange-soft); }

.cr-course-icon {
  font-size: 32px;
  line-height: 1;
}

.cr-course-name {
  font-size: 16px;
  font-weight: 700;
}

.cr-course-count {
  font-size: 13px;
  color: var(--cr-soft);
}

/* ===== 课时列表头 ===== */
.cr-lesson-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.cr-lesson-header h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--cr-text);
}

.cr-progress-badge {
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  background: var(--cr-blue-soft);
  color: var(--cr-blue);
}

/* ===== 课时卡片网格 ===== */
.cr-lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.cr-lesson-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1.5px solid var(--cr-line);
  border-radius: var(--cr-radius);
  background: var(--cr-card);
  transition: all .25s ease;
  box-shadow: 0 4px 16px rgba(62,116,191,.06);
}

.cr-lesson-card.unlocked:hover {
  transform: translateY(-2px);
  box-shadow: var(--cr-shadow);
}

.cr-lesson-card.locked {
  opacity: .6;
  filter: grayscale(.3);
}

.cr-lesson-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.cr-lesson-num {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.cr-lesson-card.unlocked .cr-lesson-num { background: var(--cr-green); }
.cr-lesson-card.locked .cr-lesson-num { background: #b0bec5; }

.cr-lesson-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--cr-text);
  line-height: 1.4;
}

.cr-lesson-desc {
  font-size: 13px;
  color: var(--cr-soft);
  line-height: 1.6;
  margin-bottom: 14px;
  flex: 1;
}

.cr-lesson-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.cr-lesson-lock-tip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #b0bec5;
}

/* ===== 按钮 ===== */
.cr-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: none;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all .2s ease;
  text-decoration: none;
}

.cr-btn-material {
  background: var(--cr-blue);
  color: #fff;
}
.cr-btn-material:hover { background: #3558d0; }

.cr-btn-exercise {
  background: var(--cr-green);
  color: #fff;
}
.cr-btn-exercise:hover { background: #38b56a; }

.cr-btn-unlock {
  background: transparent;
  color: var(--cr-soft);
  border: 1.5px dashed #ccd6e3;
  padding: 8px 14px;
}
.cr-btn-unlock:hover {
  border-color: var(--cr-blue);
  color: var(--cr-blue);
}

.cr-btn-primary {
  background: var(--cr-blue);
  color: #fff;
  padding: 10px 24px;
}
.cr-btn-primary:hover { background: #3558d0; }

.cr-btn-ghost {
  background: transparent;
  color: var(--cr-soft);
  border: 1.5px solid var(--cr-line);
  padding: 10px 24px;
}
.cr-btn-ghost:hover { border-color: var(--cr-blue); color: var(--cr-blue); }

/* ===== 弹窗 ===== */
.cr-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cr-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(4px);
}

.cr-modal-box {
  position: relative;
  width: min(420px, 90vw);
  padding: 32px;
  border-radius: var(--cr-radius);
  background: #fff;
  box-shadow: 0 24px 60px rgba(0,0,0,.2);
}

.cr-modal-box h3 {
  margin: 0 0 6px;
  font-size: 20px;
}

.cr-modal-desc {
  color: var(--cr-soft);
  font-size: 14px;
  margin: 0 0 16px;
}

.cr-modal-info {
  padding: 10px 14px;
  background: var(--cr-blue-soft);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cr-blue);
  margin-bottom: 16px;
}

.cr-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: #f0f2f5;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-soft);
}
.cr-modal-close:hover { background: #e2e5ea; }

.cr-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--cr-line);
  border-radius: 12px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
}
.cr-input:focus { border-color: var(--cr-blue); }

.cr-error {
  color: #e74c3c;
  font-size: 13px;
  margin: 8px 0 0;
}

.cr-modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .cr-course-tabs {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .cr-course-tab {
    padding: 16px 10px;
  }
  .cr-course-icon { font-size: 26px; }
  .cr-course-name { font-size: 14px; }

  .cr-lesson-grid {
    grid-template-columns: 1fr;
  }

  .cr-lesson-header h2 { font-size: 18px; }
}

/* ===== 打印样式（PDF 水印）===== */
@media print {
  @page {
    size: A4;
    margin: 16mm 13mm 16mm;

    @top-center {
      content: "⭐ 嘟噜噜学习星球 ⭐";
      color: #c7cdd8;
      font-size: 8pt;
      letter-spacing: 1.2pt;
      font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    }

    @bottom-center {
      content: "⭐ 嘟噜噜学习星球 ⭐";
      color: #c7cdd8;
      font-size: 8pt;
      letter-spacing: 1.2pt;
      font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    }
  }
}