/* 课程体系页特有样式 */

/* ===== 分组标题 ===== */
.group-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 56px 0 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.group-title:first-of-type { margin-top: 40px; }
.group-title .gradient { font-weight: 800; }
.group-sub {
  font-size: 14px;
  color: var(--text-3);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ===== 授权状态条 ===== */
.license-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px 26px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.license-bar.is-full { border-color: rgba(52, 211, 153, 0.35); }
.license-bar.is-full::before {
  background: linear-gradient(135deg, rgba(52,211,153,0.5), rgba(34,211,238,0.1) 40%, transparent 70%);
}
.lb-icon { font-size: 26px; line-height: 1; }
.lb-text { display: flex; flex-direction: column; flex: 1; min-width: 180px; }
.lb-text b { font-size: 16px; font-weight: 700; }
.lb-text span { font-size: 13.5px; color: var(--text-2); margin-top: 3px; }
.lb-chips { display: flex; gap: 10px; }
.lb-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--text-3);
  background: rgba(255,255,255,0.02);
}
.lb-chip i { font-style: normal; font-size: 12px; }
.lb-chip.is-on {
  color: var(--ok);
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.08);
}

/* ===== 筛选栏 ===== */
.course-filter {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  margin: 32px auto 0;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--surface);
  backdrop-filter: blur(12px);
}
.filter-btn {
  padding: 9px 22px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  border-radius: var(--r-pill);
  transition: all var(--t-fast);
}
.filter-btn:hover { color: var(--text-1); }
.filter-btn.is-active {
  color: #fff;
  background: var(--grad-primary);
  box-shadow: 0 4px 14px -4px rgba(43,108,255,0.6);
}

/* ===== 课程卡片（锁定/解锁状态） ===== */
.course-grid { row-gap: 20px; }
.course-card .card-no {
  font-family: 'Orbitron', sans-serif;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--star-blue-light);
  margin-bottom: 10px;
}
.course-card .card-lock {
  position: absolute;
  top: 22px;
  right: 22px;
  font-size: 16px;
  opacity: 0.85;
}
.course-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.course-tag {
  padding: 4px 10px;
  font-size: 12px;
  color: var(--text-2);
  background: rgba(43,108,255,0.08);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}
.course-card.is-locked { opacity: 0.62; }
.course-card.is-locked .card-link { color: var(--text-3); }
.course-card.is-locked::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    repeating-linear-gradient(135deg, transparent 0 14px, rgba(120,150,220,0.04) 14px 28px);
  pointer-events: none;
}
.course-card.is-unlocked { border-color: rgba(52, 211, 153, 0.3); }
.course-card.is-unlocked .card-link { color: var(--ok); }

/* ===== 解锁弹窗 ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal.is-open { display: flex; }
.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(3, 5, 15, 0.72);
  backdrop-filter: blur(6px);
}
.modal-panel {
  position: relative;
  width: 100%;
  max-width: 440px;
  padding: 36px 32px;
  text-align: center;
}
.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  font-size: 22px;
  line-height: 1;
  color: var(--text-2);
  border-radius: 50%;
  transition: all var(--t-fast);
}
.modal-close:hover { background: rgba(255,255,255,0.06); color: var(--text-1); }
.modal-kicker {
  font-family: 'Orbitron', sans-serif;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--star-cyan);
}
.modal-panel h3 { font-size: 22px; font-weight: 800; margin-top: 8px; }
.modal-desc { color: var(--text-2); font-size: 14.5px; margin-top: 10px; }
.key-input-wrap { margin: 26px 0 18px; }
.key-input {
  width: 100%;
  padding: 16px 18px;
  font-family: 'Orbitron', 'Inter', monospace;
  font-size: 18px;
  letter-spacing: 0.12em;
  text-align: center;
  text-transform: uppercase;
  color: var(--text-1);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.key-input:focus {
  border-color: var(--star-blue-light);
  box-shadow: 0 0 0 3px rgba(43,108,255,0.18);
}
.modal-actions { display: flex; justify-content: center; }
.modal-tip { margin-top: 18px; font-size: 12.5px; color: var(--text-3); line-height: 1.6; }
.modal-tip.is-warn { color: var(--warn); }
.modal-tip.is-error { color: var(--danger); }

/* ===== 按钮变体 ===== */
.btn-ghost {
  color: var(--text-1);
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.03);
}
.btn-ghost:hover { border-color: var(--star-blue-light); background: rgba(43,108,255,0.1); }

@media (max-width: 640px) {
  .group-title { flex-wrap: wrap; gap: 6px; }
  .modal-panel { padding: 30px 22px; }
  .key-input { font-size: 16px; padding: 14px; }
}