/* ============================================
   加载界面多主题系统 
   支持 4 种风格自由切换
   ============================================ */

/* 
   使用方式：修改 index.html 中 loadingOverlay 的 data-theme 属性
   
   可选值：
   1. "tech"      - 科技AI风（默认）：爆炸粒子 + 高级动画
   2. "minimal"   - 极简线性风：几何线条 + 简约动画
   3. "neon"      - 霓虹赛博风：荧光色 + 玻璃质感
   4. "cosmos"    - 星空梦幻风：粒子星空 + 光球效果
*/

/* ======= 科技AI风 (tech) ======= */
.loading-overlay[data-theme="tech"] {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.loading-overlay[data-theme="tech"] .loading-particles {
  opacity: 1;
}

.loading-overlay[data-theme="tech"] .particle {
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 8px rgba(102, 126, 234, 0.8);
}

.loading-overlay[data-theme="tech"] .loading-icon {
  box-shadow: 0 0 30px rgba(102, 126, 234, 0.8), 
              0 0 60px rgba(118, 75, 162, 0.4);
}

.loading-overlay[data-theme="tech"] .loading-card {
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid rgba(102, 126, 234, 0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 
              0 0 60px rgba(102, 126, 234, 0.25);
}

.loading-overlay[data-theme="tech"] .loading-bar {
  background: linear-gradient(90deg, #f0f0f0, #e8e8e8);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05),
              0 0 15px rgba(102, 126, 234, 0.15);
}

.loading-overlay[data-theme="tech"] .loading-bar-fill {
  background: linear-gradient(90deg, #667eea 0%, #764ba2 50%, #667eea 100%);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.6);
}

.loading-overlay[data-theme="tech"] .loading-step.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  box-shadow: 0 0 15px rgba(102, 126, 234, 0.8);
}

/* ======= 极简线性风 (minimal) ======= */
.loading-overlay[data-theme="minimal"] {
  background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.loading-overlay[data-theme="minimal"] .loading-particles {
  display: none;
}

.loading-overlay[data-theme="minimal"] .loading-glow {
  display: none;
}

.loading-overlay[data-theme="minimal"] .loading-icon-orbit {
  border: 2px dashed rgba(59, 130, 246, 0.3);
  animation: rotateSlow 5s linear infinite;
}

@keyframes rotateSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.loading-overlay[data-theme="minimal"] .loading-icon {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.loading-overlay[data-theme="minimal"] .loading-card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  backdrop-filter: none;
}

.loading-overlay[data-theme="minimal"] .loading-bar {
  height: 3px;
  background: linear-gradient(90deg, #f3f4f6, #e5e7eb);
  box-shadow: none;
}

.loading-overlay[data-theme="minimal"] .loading-bar-fill {
  background: linear-gradient(90deg, #3b82f6 0%, #2563eb 100%);
  box-shadow: none;
}

.loading-overlay[data-theme="minimal"] .loading-bar-shimmer {
  display: none;
}

.loading-overlay[data-theme="minimal"] .loading-step {
  width: 6px;
  height: 6px;
}

.loading-overlay[data-theme="minimal"] .loading-step.active {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  box-shadow: none;
  animation: none;
}

.loading-overlay[data-theme="minimal"] .loading-dot {
  animation: none;
  opacity: 0.5;
}

/* ======= 霓虹赛博风 (neon) ======= */
.loading-overlay[data-theme="neon"] {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.loading-overlay[data-theme="neon"] .loading-particles {
  display: none;
}

.loading-overlay[data-theme="neon"] .particle {
  background: rgba(59, 130, 246, 0.8);
  box-shadow: 0 0 10px rgba(59, 130, 246, 1);
}

.loading-overlay[data-theme="neon"] .loading-card {
  background: rgba(15, 23, 42, 0.8);
  border: 2px solid #00d9ff;
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.5),
              inset 0 0 20px rgba(0, 217, 255, 0.1);
  backdrop-filter: blur(20px);
}

.loading-overlay[data-theme="neon"] .loading-title {
  color: #00d9ff;
  text-shadow: 0 0 10px rgba(0, 217, 255, 0.8);
  animation: neonGlow 2s ease-in-out infinite;
}

@keyframes neonGlow {
  0%, 100% { text-shadow: 0 0 10px rgba(0, 217, 255, 0.8); }
  50% { text-shadow: 0 0 20px rgba(0, 217, 255, 1); }
}

.loading-overlay[data-theme="neon"] .loading-subtitle {
  color: #06b6d4;
}

.loading-overlay[data-theme="neon"] .loading-icon {
  background: linear-gradient(135deg, #06b6d4 0%, #00d9ff 100%);
  box-shadow: 0 0 30px rgba(0, 217, 255, 1),
              0 0 60px rgba(6, 182, 212, 0.5);
  border: 2px solid rgba(0, 217, 255, 0.5);
}

.loading-overlay[data-theme="neon"] .loading-icon-orbit {
  border: 2px solid #06b6d4;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.8);
}

.loading-overlay[data-theme="neon"] .loading-bar {
  background: rgba(6, 182, 212, 0.2);
  box-shadow: inset 0 0 10px rgba(6, 182, 212, 0.3),
              0 0 20px rgba(0, 217, 255, 0.2);
  border: 1px solid rgba(0, 217, 255, 0.3);
}

.loading-overlay[data-theme="neon"] .loading-bar-fill {
  background: linear-gradient(90deg, #06b6d4 0%, #00d9ff 50%, #06b6d4 100%);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.8);
}

.loading-overlay[data-theme="neon"] .loading-bar-shimmer {
  background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.5), transparent);
}

.loading-overlay[data-theme="neon"] .loading-text {
  color: #00d9ff;
  text-shadow: 0 0 8px rgba(0, 217, 255, 0.6);
}

.loading-overlay[data-theme="neon"] .loading-step {
  background: rgba(6, 182, 212, 0.3);
  border: 1px solid rgba(6, 182, 212, 0.5);
}

.loading-overlay[data-theme="neon"] .loading-step.active {
  background: linear-gradient(135deg, #06b6d4 0%, #00d9ff 100%);
  box-shadow: 0 0 20px rgba(0, 217, 255, 1);
  border: 1px solid rgba(0, 217, 255, 0.8);
}

/* ======= 星空梦幻风 (cosmos) ======= */
.loading-overlay[data-theme="cosmos"] {
  background: radial-gradient(ellipse at top, #1a2332 0%, #0f1419 50%, #000814 100%);
}

.loading-overlay[data-theme="cosmos"]::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, rgba(238, 130, 238, 0.5), rgba(255, 255, 255, 0)),
    radial-gradient(2px 2px at 60px 70px, rgba(135, 206, 235, 0.5), rgba(255, 255, 255, 0)),
    radial-gradient(1px 1px at 50px 50px, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0)),
    radial-gradient(1px 1px at 130px 80px, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0)),
    radial-gradient(2px 2px at 90px 10px, rgba(138, 43, 226, 0.5), rgba(255, 255, 255, 0));
  background-repeat: repeat;
  background-size: 200px 200px;
  animation: starsTwinkle 8s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes starsTwinkle {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.loading-overlay[data-theme="cosmos"] .loading-particles {
  opacity: 0.8;
}

.loading-overlay[data-theme="cosmos"] .particle {
  width: 6px;
  height: 6px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.3));
  box-shadow: 0 0 12px rgba(138, 43, 226, 0.6);
}

.loading-overlay[data-theme="cosmos"] .loading-card {
  background: rgba(15, 17, 25, 0.9);
  border: 1px solid rgba(138, 43, 226, 0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
              0 0 60px rgba(138, 43, 226, 0.2),
              inset 0 1px 0 rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(15px);
  position: relative;
  z-index: 10;
}

.loading-overlay[data-theme="cosmos"] .loading-glow {
  background: radial-gradient(circle, rgba(138, 43, 226, 0.2) 0%, transparent 70%);
  animation: cosmicPulse 4s ease-in-out infinite;
}

@keyframes cosmicPulse {
  0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(0.8); }
  50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.3); }
}

.loading-overlay[data-theme="cosmos"] .loading-title {
  color: #e4bbff;
  text-shadow: 0 0 15px rgba(138, 43, 226, 0.6);
}

.loading-overlay[data-theme="cosmos"] .loading-subtitle {
  color: #b9a8d9;
  text-shadow: 0 0 10px rgba(138, 43, 226, 0.4);
}

.loading-overlay[data-theme="cosmos"] .loading-icon {
  background: radial-gradient(circle at 30% 30%, rgba(138, 43, 226, 0.6), #6a0572);
  box-shadow: 0 0 40px rgba(138, 43, 226, 0.8),
              0 0 80px rgba(138, 43, 226, 0.4);
}

.loading-overlay[data-theme="cosmos"] .loading-icon-orbit {
  border: 2px solid transparent;
  border-top-color: rgba(138, 43, 226, 0.6);
  border-right-color: rgba(138, 43, 226, 0.2);
  box-shadow: 0 0 20px rgba(138, 43, 226, 0.5);
}

.loading-overlay[data-theme="cosmos"] .loading-bar {
  background: linear-gradient(90deg, rgba(138, 43, 226, 0.1), rgba(138, 43, 226, 0.2));
  box-shadow: 0 0 15px rgba(138, 43, 226, 0.2);
  border: 1px solid rgba(138, 43, 226, 0.2);
}

.loading-overlay[data-theme="cosmos"] .loading-bar-fill {
  background: linear-gradient(90deg, #8a2be2 0%, #da70d6 50%, #8a2be2 100%);
  box-shadow: 0 0 25px rgba(138, 43, 226, 0.8);
}

.loading-overlay[data-theme="cosmos"] .loading-bar-shimmer {
  background: linear-gradient(90deg, transparent, rgba(218, 112, 214, 0.4), transparent);
}

.loading-overlay[data-theme="cosmos"] .loading-text {
  color: #da70d6;
  text-shadow: 0 0 10px rgba(138, 43, 226, 0.5);
}

.loading-overlay[data-theme="cosmos"] .loading-step {
  background: rgba(138, 43, 226, 0.2);
  border: 1px solid rgba(138, 43, 226, 0.3);
}

.loading-overlay[data-theme="cosmos"] .loading-step.active {
  background: linear-gradient(135deg, #8a2be2 0%, #da70d6 100%);
  box-shadow: 0 0 20px rgba(138, 43, 226, 0.8);
}

/* ======= 通用过渡效果 ======= */
.loading-overlay {
  transition: background 0.3s ease;
}

.loading-card {
  transition: background 0.3s ease, border 0.3s ease;
}