/* ============================================
   好奇心提问教练 — 全局样式
   暗色星空主题 · 温暖光感 · 微动效 · 圆润友好
   ============================================ */

/* --- CSS 自定义属性 (主题色) --- */
:root {
  --color-bg-start: #0a0a1a;
  --color-bg-mid: #12102a;
  --color-bg-end: #1a1030;
  --color-primary: #f0c060;
  --color-primary-glow: #f5d080;
  --color-accent: #c084fc;
  --color-accent-glow: #d8b4fe;
  --color-text: #e8e0f0;
  --color-text-dim: #a098b8;
  --color-text-bright: #ffffff;
  --color-card-bg: rgba(255, 255, 255, 0.05);
  --color-card-border: rgba(255, 255, 255, 0.08);
  --color-card-hover: rgba(255, 255, 255, 0.10);
  --color-success: #4ade80;
  --color-danger: #f87171;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(240, 192, 96, 0.15);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* --- 基础重置 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: linear-gradient(160deg, var(--color-bg-start) 0%, var(--color-bg-mid) 40%, var(--color-bg-end) 100%);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* --- 星空背景粒子 (纯 CSS 模拟) --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 25% 35%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1.5px 1.5px at 40% 10%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 55% 45%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 85% 40%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 15% 60%, rgba(255,255,255,0.25), transparent),
    radial-gradient(1.5px 1.5px at 30% 75%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1px 1px at 50% 65%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 65% 80%, rgba(255,255,255,0.25), transparent),
    radial-gradient(1.5px 1.5px at 80% 55%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 90% 70%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 5% 85%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1.5px 1.5px at 45% 90%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1px 1px at 75% 15%, rgba(255,255,255,0.3), transparent);
  pointer-events: none;
  z-index: 0;
}

/* --- 语义化布局 --- */
header, main, footer, nav, article, section {
  position: relative;
  z-index: 1;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 24px 60px;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(10, 10, 26, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.nav-bar .nav-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.nav-bar .nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

.nav-bar .nav-links a:hover,
.nav-bar .nav-links a.active {
  color: var(--color-primary);
}

/* --- 返回首页链接 --- */
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 16px;
  transition: color var(--transition-fast);
}

.back-home:hover {
  color: var(--color-primary);
}

/* --- 页面标题 --- */
.page-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  margin: 24px 0 8px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  text-align: center;
  color: var(--color-text-dim);
  font-size: 1rem;
  margin-bottom: 32px;
}

/* --- 卡片 --- */
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  background: var(--color-card-hover);
}

.card:active {
  transform: translateY(-1px);
}

.card-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 12px;
}

.card h2, .card h3 {
  color: var(--color-text-bright);
  margin-bottom: 8px;
}

.card p {
  color: var(--color-text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-stack);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  text-decoration: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #e0a840);
  color: #1a1a2e;
  box-shadow: 0 4px 16px rgba(240, 192, 96, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(240, 192, 96, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #a855f7);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(192, 132, 252, 0.25);
}

.btn-accent:hover {
  box-shadow: 0 6px 24px rgba(192, 132, 252, 0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: rgba(240, 192, 96, 0.1);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.15rem;
  border-radius: var(--radius-lg);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* --- 输入框 --- */
.input {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  color: var(--color-text-bright);
  font-family: var(--font-stack);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.input::placeholder {
  color: var(--color-text-dim);
  opacity: 0.6;
}

.input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(240, 192, 96, 0.15);
}

textarea.input {
  resize: vertical;
  min-height: 100px;
}

/* --- 标签/徽章 --- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-gold {
  background: rgba(240, 192, 96, 0.2);
  color: var(--color-primary);
}

.badge-purple {
  background: rgba(192, 132, 252, 0.2);
  color: var(--color-accent);
}

.badge-green {
  background: rgba(74, 222, 128, 0.2);
  color: var(--color-success);
}

/* --- 等级弹出动画 --- */
.grade-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  background: linear-gradient(135deg, #1a1030, #0a0a1a);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-xl);
  padding: 40px 60px;
  text-align: center;
  z-index: 1000;
  box-shadow: 0 0 60px rgba(240, 192, 96, 0.3);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.grade-popup.show {
  transform: translate(-50%, -50%) scale(1);
}

.grade-popup .grade-letter {
  font-size: 4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.grade-popup .grade-label {
  color: var(--color-text-dim);
  font-size: 1rem;
  margin-top: 8px;
}

/* --- 星星飘落粒子容器 --- */
.stars-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
}

.star-particle {
  position: absolute;
  font-size: 1.5rem;
  animation: starFall 2s ease-out forwards;
  pointer-events: none;
}

@keyframes starFall {
  0% {
    opacity: 1;
    transform: translateY(0) rotate(0deg) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(400px) rotate(360deg) scale(0.2);
  }
}

/* --- 时间轴 (日记页) --- */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
  padding-left: 20px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 12px rgba(240, 192, 96, 0.5);
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--color-text-dim);
  margin-bottom: 6px;
}

.timeline-content {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.timeline-content:hover {
  background: var(--color-card-hover);
  transform: translateX(4px);
}

/* --- 网格卡片布局 (首页) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card-grid .card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* --- 双人对战布局 --- */
.duel-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.duel-player {
  text-align: center;
}

.duel-player .player-emoji {
  font-size: 3rem;
  display: block;
  margin-bottom: 8px;
}

.duel-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* --- 合成工坊 --- */
.forge-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 24px 0;
}

.forge-slot {
  width: 160px;
  height: 120px;
  background: var(--color-card-bg);
  border: 2px dashed var(--color-card-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--color-text-dim);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
  text-align: center;
  padding: 12px;
}

.forge-slot:hover {
  border-color: var(--color-primary);
  background: var(--color-card-hover);
}

.forge-slot.filled {
  border-style: solid;
  border-color: var(--color-accent);
  color: var(--color-text-bright);
}

.forge-plus {
  font-size: 2rem;
  color: var(--color-primary);
}

.forge-result {
  width: 100%;
  max-width: 400px;
  margin: 24px auto;
  text-align: center;
}

/* --- Toast 提示 --- */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(30, 20, 50, 0.95);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 12px 24px;
  color: var(--color-text-bright);
  font-size: 0.9rem;
  z-index: 1001;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal);
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* --- 工具类 --- */
.text-center { text-align: center; }
.text-dim { color: var(--color-text-dim); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.gap-12 { gap: 12px; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* --- 响应式 --- */
@media (max-width: 640px) {
  main {
    padding: 16px 16px 48px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .card {
    padding: 20px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .duel-layout {
    grid-template-columns: 1fr;
  }

  .nav-bar {
    flex-direction: column;
    gap: 8px;
    padding: 12px 16px;
  }

  .nav-bar .nav-links {
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .forge-area {
    flex-direction: column;
  }

  .grade-popup {
    padding: 28px 40px;
  }

  .grade-popup .grade-letter {
    font-size: 3rem;
  }
}

/* --- 无障碍: 减少动画 --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}