/* ============================================
   中暑急救小卫士 — 通用样式表
   暗色渐变主题 · 霓虹点缀 · 毛玻璃卡片
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  --color-bg-start: #0a0e27;
  --color-bg-end: #1a0a2e;
  --color-primary: #00d4ff;
  --color-accent: #ff6b35;
  --color-success: #00e676;
  --color-warning: #ffd740;
  --color-danger: #ff5252;
  --color-text: #e0e0e0;
  --color-text-dim: #a0a0b0;
  --color-card-bg: rgba(255, 255, 255, 0.06);
  --color-card-border: rgba(255, 255, 255, 0.10);
  --color-glass: rgba(255, 255, 255, 0.05);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.15);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  padding: 0 16px 40px;
}

/* --- 导航栏 --- */
nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  max-width: 960px;
  margin: 0 auto 24px;
  border-bottom: 1px solid var(--color-card-border);
}

nav a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

nav a:hover {
  color: var(--color-primary);
  background: rgba(0, 212, 255, 0.08);
}

nav .nav-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-right: auto;
}

/* --- 主容器 --- */
.container {
  max-width: 960px;
  margin: 0 auto;
}

/* --- 标题渐变文字 --- */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

p {
  margin-bottom: 12px;
  color: var(--color-text-dim);
  line-height: 1.7;
}

/* --- 毛玻璃卡片 --- */
.card {
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), #0099cc);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.25);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 212, 255, 0.4);
}

.btn:active {
  transform: translateY(0);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #e05500);
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.25);
}

.btn-accent:hover {
  box-shadow: 0 6px 25px rgba(255, 107, 53, 0.4);
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success), #00b85c);
  box-shadow: 0 4px 15px rgba(0, 230, 118, 0.25);
}

.btn-success:hover {
  box-shadow: 0 6px 25px rgba(0, 230, 118, 0.4);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* --- 网格布局 --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

/* --- 入口卡片（首页用） --- */
.entry-card {
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.entry-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.entry-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

.entry-card:hover::before {
  opacity: 1;
}

.entry-card .icon {
  font-size: 3rem;
  margin-bottom: 12px;
  display: block;
}

.entry-card h3 {
  color: var(--color-text);
  margin-bottom: 6px;
}

.entry-card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* --- 翻卡容器（科普页用） --- */
.flip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}

.flip-card {
  perspective: 800px;
  height: 200px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.flip-card-front {
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-card-border);
}

.flip-card-front .card-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
}

.flip-card-front .tap-hint {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-top: 8px;
}

.flip-card-back {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(255, 107, 53, 0.08));
  border: 1px solid var(--color-primary);
  transform: rotateY(180deg);
  color: var(--color-text);
}

.flip-card-back p {
  color: var(--color-text);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* --- 情景模拟 — 对话气泡 --- */
.chat-box {
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  min-height: 200px;
  margin: 16px 0;
}

.chat-bubble {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  max-width: 85%;
  animation: fadeInUp 0.3s ease;
}

.chat-bubble.narrator {
  background: rgba(0, 212, 255, 0.10);
  border-left: 3px solid var(--color-primary);
  max-width: 100%;
  color: var(--color-text);
}

.chat-bubble.option {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  cursor: pointer;
  transition: var(--transition);
  margin-left: auto;
  margin-right: 0;
}

.chat-bubble.option:hover {
  border-color: var(--color-primary);
  background: rgba(0, 212, 255, 0.08);
  transform: translateX(4px);
}

.chat-bubble.result {
  text-align: center;
  font-size: 1.1rem;
  font-weight: 600;
}

.chat-bubble.result.good {
  background: rgba(0, 230, 118, 0.12);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.chat-bubble.result.bad {
  background: rgba(255, 82, 82, 0.12);
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
}

/* --- 救回特效 --- */
.rescue-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.rescue-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.rescue-content {
  text-align: center;
  animation: rescuePop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.rescue-content .big-icon {
  font-size: 6rem;
  display: block;
  margin-bottom: 16px;
}

.rescue-content h2 {
  color: var(--color-success);
  font-size: 2rem;
}

.rescue-content p {
  color: var(--color-text);
  font-size: 1.1rem;
}

/* --- 清单生成 --- */
.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  transition: var(--transition);
}

.checklist-item.checked {
  opacity: 0.6;
  text-decoration: line-through;
}

.checklist-item input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* --- 进度条 --- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
  margin: 12px 0;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* --- 动画 --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rescuePop {
  0% {
    transform: scale(0.3);
    opacity: 0;
  }
  60% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
  }
  50% {
    box-shadow: 0 0 25px rgba(0, 212, 255, 0.5);
  }
}

.glow-pulse {
  animation: glowPulse 2s ease-in-out infinite;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.2rem; }

  .grid-2,
  .grid-3,
  .flip-grid {
    grid-template-columns: 1fr;
  }

  .flip-card {
    height: 170px;
  }

  .entry-card {
    padding: 24px 16px;
  }

  nav {
    flex-wrap: wrap;
  }

  .chat-bubble {
    max-width: 95%;
  }
}

@media (max-width: 480px) {
  body { padding: 0 12px 32px; }
  .card { padding: 16px; }
  .btn { padding: 10px 20px; font-size: 0.9rem; }
}