/* ============================================
   暴雨放学安全小助手 — 通用样式表
   暗色主题 · 卡通可爱 · 微动效
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  --color-primary: #60a5fa;       /* 亮蓝 */
  --color-primary-hover: #93bbfd;
  --color-accent: #fbbf24;        /* 暖黄 */
  --color-accent-hover: #fcd34d;
  --color-danger: #f87171;        /* 警示红 */
  --color-success: #34d399;       /* 安全绿 */
  --color-bg-start: #0f172a;      /* 深蓝 */
  --color-bg-end: #1e1b4b;        /* 深紫 */
  --color-card-bg: rgba(255, 255, 255, 0.08);
  --color-card-border: rgba(255, 255, 255, 0.12);
  --color-text: #e2e8f0;
  --color-text-dim: #94a3b8;
  --color-text-bright: #f8fafc;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.45);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC",
                "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-stack);
  background: linear-gradient(145deg, 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-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  max-width: 960px;
  margin: 0 auto 24px;
  border-bottom: 1px solid var(--color-card-border);
}

.nav-bar .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: 20px;
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus {
  background: var(--color-card-bg);
  color: var(--color-text-bright);
}

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

/* --- 标题渐变文字 --- */
.gradient-title {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
  line-height: 1.3;
}

.subtitle {
  color: var(--color-text-dim);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

/* --- 卡片网格 --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.card {
  background: var(--color-card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card:hover,
.card:focus {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
  outline: none;
}

.card:active {
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2.4rem;
  line-height: 1;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-bright);
}

.card p {
  font-size: 0.9rem;
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* --- 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;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
              background var(--transition);
  text-decoration: none;
}

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

.btn-primary {
  background: var(--color-primary);
  color: #0f172a;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--color-primary-hover);
  box-shadow: 0 0 20px rgba(96, 165, 250, 0.35);
}

.btn-accent {
  background: var(--color-accent);
  color: #0f172a;
}

.btn-accent:hover,
.btn-accent:focus {
  background: var(--color-accent-hover);
  box-shadow: 0 0 20px rgba(251, 191, 36, 0.35);
}

.btn-danger {
  background: var(--color-danger);
  color: #0f172a;
}

.btn-success {
  background: var(--color-success);
  color: #0f172a;
}

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

/* --- 表单元素 --- */
input, textarea, select {
  font-family: var(--font-stack);
  font-size: 1rem;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-card-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
}

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

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text-bright);
}

/* --- 消息提示条 --- */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-80px);
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 999;
  transition: transform 0.4s ease;
  pointer-events: none;
  max-width: 90vw;
  text-align: center;
}

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

.toast-success {
  background: var(--color-success);
  color: #0f172a;
}

.toast-error {
  background: var(--color-danger);
  color: #0f172a;
}

.toast-info {
  background: var(--color-primary);
  color: #0f172a;
}

/* --- 页面头部 --- */
.page-header {
  text-align: center;
  padding: 32px 0 16px;
}

.page-header .emoji-big {
  font-size: 3rem;
  display: block;
  margin-bottom: 8px;
}

/* --- 内容区块 --- */
.section {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-card);
}

.section h2 {
  font-size: 1.3rem;
  color: var(--color-text-bright);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section p, .section li {
  color: var(--color-text);
  line-height: 1.7;
}

/* --- 列表样式 --- */
.tip-list {
  list-style: none;
  padding: 0;
}

.tip-list li {
  padding: 12px 16px;
  border-left: 3px solid var(--color-primary);
  margin-bottom: 10px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.tip-list li .tip-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* --- 问答区 --- */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 16px 0;
}

.quiz-option {
  padding: 14px 18px;
  border: 2px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-stack);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition), border-color var(--transition);
}

.quiz-option:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-primary);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(52, 211, 153, 0.15);
}

.quiz-option.wrong {
  border-color: var(--color-danger);
  background: rgba(248, 113, 113, 0.15);
}

.quiz-option:disabled {
  cursor: default;
}

.quiz-result {
  text-align: center;
  padding: 20px;
  font-size: 1.2rem;
  font-weight: 700;
}

/* --- 平安信卡片 --- */
.message-card {
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.08), rgba(96, 165, 250, 0.08));
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 24px;
  margin: 16px 0;
  white-space: pre-wrap;
  line-height: 1.8;
  font-size: 1.05rem;
}

/* --- 分数 / 进度显示 --- */
.score-display {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.score-item {
  text-align: center;
  background: var(--color-card-bg);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-card-border);
}

.score-item .number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
  display: block;
}

.score-item .label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

/* --- 响应式 --- */
@media (max-width: 640px) {
  body { padding: 0 12px 32px; }

  .gradient-title {
    font-size: 1.6rem;
  }

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

  .nav-bar {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .section {
    padding: 16px;
  }

  .score-display {
    gap: 12px;
  }
}

/* ============================================
   开始封面页 (start.html)
   ============================================ */

.start-body {
  margin: 0 !important;
  padding: 0 !important;
  overflow: hidden;
  background: linear-gradient(180deg, #0a0e27 0%, #1a1040 40%, #2d1b69 100%) !important;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* --- 雨滴容器 --- */
.rain-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.raindrop {
  position: absolute;
  top: -20px;
  width: 2px;
  background: linear-gradient(to bottom, transparent, #60a5fa);
  border-radius: 1px;
  animation: rainFall linear infinite;
}

@keyframes rainFall {
  0%   { transform: translateY(-20px); }
  100% { transform: translateY(100vh); }
}

/* --- 封面内容 --- */
.start-cover {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 20px;
  max-width: 520px;
  width: 100%;
  animation: fadeInUp 1.2s ease;
}

@keyframes fadeInUp {
  0%   { opacity: 0; transform: translateY(40px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* --- 天空元素 --- */
.start-sky {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 2.8rem;
}

.start-cloud {
  display: inline-block;
  animation: floatCloud 4s ease-in-out infinite;
}

.cloud-left  { animation-delay: 0s; }
.cloud-right { animation-delay: 2s; }

.start-lightning {
  font-size: 2.2rem;
  animation: flashLightning 3s ease-in-out infinite;
}

@keyframes floatCloud {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(12px); }
}

@keyframes flashLightning {
  0%, 90%, 100% { opacity: 0.6; transform: scale(1); }
  92%           { opacity: 1;   transform: scale(1.3); }
  95%           { opacity: 0.3; transform: scale(0.9); }
}

/* --- 角色 --- */
.start-character {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 4px;
  margin-bottom: 20px;
  font-size: 3.5rem;
  animation: bounceChar 2s ease-in-out infinite;
}

.start-umbrella {
  font-size: 3rem;
  transform: rotate(-10deg);
}

.start-kid {
  font-size: 3.8rem;
}

@keyframes bounceChar {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* --- 标题 --- */
.start-title {
  margin-bottom: 16px;
}

.title-line {
  display: block;
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text-bright);
  text-shadow: 0 0 30px rgba(96, 165, 250, 0.3);
}

.title-line.accent {
  font-size: 2.8rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- 副标题 --- */
.start-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-dim);
  line-height: 1.7;
  margin-bottom: 32px;
}

/* --- 开始按钮 --- */
.start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 48px;
  font-size: 1.3rem;
  font-weight: 700;
  font-family: var(--font-stack);
  color: #0f172a;
  background: linear-gradient(135deg, var(--color-accent), #f59e0b);
  border: none;
  border-radius: 50px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 0 30px rgba(251, 191, 36, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  animation: pulseBtn 2.5s ease-in-out infinite;
}

.start-btn:hover,
.start-btn:focus {
  transform: scale(1.08);
  box-shadow: 0 0 50px rgba(251, 191, 36, 0.5);
}

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

@keyframes pulseBtn {
  0%, 100% { box-shadow: 0 0 30px rgba(251, 191, 36, 0.3); }
  50%      { box-shadow: 0 0 50px rgba(251, 191, 36, 0.6); }
}

/* --- 底部文字 --- */
.start-footer-text {
  margin-top: 40px;
  font-size: 0.85rem;
  color: var(--color-text-dim);
  opacity: 0.7;
}

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