/* =========================================
   教程页样式
   ========================================= */
#tutorial-header { padding: 140px 0 30px; text-align: center; }
.tutorial-sub { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--text-secondary); margin: 12px auto 28px; max-width: 650px; }

.path-nav { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 40px; }
.path-tab {
  padding: 10px 20px; border-radius: 24px; font-size: 0.9rem; font-weight: 500;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary); transition: var(--transition); position: relative; overflow: hidden;
}
.path-tab:hover { background: rgba(123,104,238,0.15); border-color: rgba(123,104,238,0.3); color: var(--text-primary); }
.path-tab.active {
  background: linear-gradient(135deg, rgba(123,104,238,0.25), rgba(147,112,219,0.2));
  border-color: var(--accent-purple); color: var(--text-primary);
  box-shadow: 0 0 15px rgba(123,104,238,0.4);
}
.path-tab::after {
  content: ''; position: absolute; bottom: 0; left: 0; height: 3px; background: var(--accent-gold);
  width: 0; transition: width 0.3s ease;
}
.path-tab.active::after { width: 100%; }

.tut-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 28px; margin-bottom: 60px; }
.tut-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px;
  padding: 24px; backdrop-filter: blur(var(--blur-glass));
  box-shadow: 0 4px 12px rgba(0,0,0,0.3), 0 0 15px rgba(123,104,238,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease; display: flex; flex-direction: column; gap: 14px;
  position: relative; overflow: hidden;
}
.tut-card:hover { transform: translateY(-6px); box-shadow: 0 12px 24px rgba(0,0,0,0.4), 0 0 25px rgba(123,104,238,0.2); }
.tut-card.completed { border-color: #10B981; }
.tut-card.completed::before {
  content: '✅ 轨道已同步'; position: absolute; top: 12px; right: 12px;
  background: rgba(16,185,129,0.15); color: #10B981; font-size: 0.75rem; padding: 4px 10px; border-radius: 12px;
}

.tut-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.orbit-level { font-size: 0.8rem; padding: 4px 10px; border-radius: 12px; background: rgba(96,165,250,0.1); color: #60A5FA; }
.time-est { font-size: 0.8rem; color: var(--text-secondary); display: flex; align-items: center; gap: 4px; }

.tut-title { font-size: 1.2rem; font-weight: 600; color: var(--text-primary); line-height: 1.4; }
.tut-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: break-word;
}

.progress-wrap { margin-top: 8px; background: rgba(255,255,255,0.05); height: 6px; border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, #7B68EE, #FFD700); width: 0%; transition: width 0.5s ease; border-radius: 3px; }

.tut-actions { display: flex; gap: 10px; margin-top: auto; padding-top: 14px; border-top: 1px solid rgba(255,255,255,0.05); }
.btn-start, .btn-preview {
  flex: 1; padding: 8px; border-radius: 10px; border: 1px solid rgba(255,255,255,0.15);
  font-size: 0.85rem; font-weight: 500; transition: var(--transition); text-align: center;
}
.btn-start { background: linear-gradient(135deg, rgba(123,104,238,0.3), rgba(147,112,219,0.2)); color: var(--text-primary); }
.btn-start:hover { background: linear-gradient(135deg, rgba(123,104,238,0.5), rgba(147,112,219,0.35)); box-shadow: 0 0 12px rgba(123,104,238,0.3); }
.btn-preview { background: transparent; color: var(--text-secondary); }
.btn-preview:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

.modal-overlay {
  position: fixed; inset: 0; background: rgba(5,8,20,0.85); backdrop-filter: blur(8px);
  z-index: 100; display: flex; align-items: center; justify-content: center; padding: 20px;
  opacity: 0; visibility: hidden; transition: 0.3s ease;
}
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-box {
  width: 100%; max-width: 800px; background: var(--bg-deep); border: 1px solid var(--card-border);
  border-radius: 16px; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  transform: translateY(20px); transition: transform 0.35s ease; max-height: 90vh; display: flex; flex-direction: column;
}
.modal-overlay.open .modal-box { transform: translateY(0); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; background: rgba(255,255,255,0.03); border-bottom: 1px solid rgba(255,255,255,0.05); }
.modal-title { font-weight: 600; font-size: 1.1rem; }
.close-btn { background: transparent; border: none; color: var(--text-secondary); font-size: 1.2rem; cursor: pointer; transition: 0.2s; }
.close-btn:hover { color: var(--text-highlight); transform: rotate(90deg); }

.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.step-list { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.step-item { display: flex; gap: 16px; padding: 16px; background: rgba(255,255,255,0.02); border-radius: 12px; border: 1px solid rgba(255,255,255,0.05); transition: 0.2s; }
.step-item:hover { background: rgba(255,255,255,0.04); }
.step-num { min-width: 32px; height: 32px; border-radius: 50%; background: rgba(123,104,238,0.2); color: var(--accent-purple); display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 0.9rem; }
.step-item.done .step-num { background: #10B981; color: #fff; }
.step-content h4 { font-size: 1rem; margin-bottom: 6px; color: var(--text-primary); }
.step-content p { font-size: 0.9rem; color: var(--text-secondary); margin: 0; }
.step-btn { margin-top: 8px; padding: 6px 14px; font-size: 0.8rem; background: transparent; border: 1px solid rgba(255,255,255,0.2); color: var(--text-secondary); border-radius: 8px; transition: 0.2s; }
.step-btn:hover { border-color: var(--accent-purple); color: var(--accent-purple); }
.step-btn.mark { background: var(--accent-purple); border-color: var(--accent-purple); color: #fff; }
.step-btn.mark:hover { background: #6366F1; }

.terminal-preview {
  background: var(--code-bg); border: 1px solid rgba(123,104,238,0.2); border-radius: 10px;
  padding: 14px; font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; color: #A0AEC0;
  margin-top: 12px; overflow-x: auto; white-space: pre; line-height: 1.6;
}
.term-cursor { display: inline-block; width: 8px; height: 16px; background: var(--accent-gold); animation: blink 1s step-end infinite; vertical-align: middle; }
@keyframes blink { 50% { opacity: 0; } }

/* =========================================
   响应式调整
   ========================================= */
@media (max-width: 768px) {
  .tut-grid { grid-template-columns: 1fr; }
  .modal-box { max-height: 95vh; }
  #tutorial-header { padding-top: 110px; }
}