/* ===== 安全小卫士 — 全局样式 ===== */
:root {
  /* 暗色主题（默认） */
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-card: #0f3460;
  --color-primary: #e85d04;
  --color-primary-hover: #f48c06;
  --color-danger: #dc2f02;
  --color-warning: #f4a261;
  --color-safe: #2a9d8f;
  --color-text: #e0e0e0;
  --color-text-secondary: #a0a0b0;
  --color-border: #2a2a4a;
  --color-nav-bg: #0d1b2a;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

/* 浅色模式（通过 .light-mode 切换） */
.light-mode {
  --color-bg: #f0f0f0;
  --color-surface: #ffffff;
  --color-card: #ffffff;
  --color-primary: #d95a00;
  --color-primary-hover: #e06b10;
  --color-danger: #c1121f;
  --color-warning: #e9c46a;
  --color-safe: #2a9d8f;
  --color-text: #1a1a2e;
  --color-text-secondary: #555;
  --color-border: #ddd;
  --color-nav-bg: #ffffff;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 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: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

/* ===== 导航栏 ===== */
.nav-bar {
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar .logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-links {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  transition: background 0.2s, color 0.2s;
}

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

/* 主题切换按钮 */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.theme-toggle:hover {
  background: var(--color-surface);
}

/* ===== 容器 ===== */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.2rem 1rem 2rem;
}

/* ===== 卡片 ===== */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
  font-family: var(--font-stack);
}

.btn:active {
  transform: scale(0.97);
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
}

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

.btn-danger:hover {
  background: #a80f00;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  background: var(--color-surface);
}

.btn-sm {
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
}

/* ===== 进度条（风险等级） ===== */
.risk-bar {
  display: flex;
  height: 24px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--color-border);
  margin: 0.6rem 0;
}

.risk-bar .segment {
  flex: 1;
  transition: background 0.3s;
}

.risk-bar .segment.low { background: #2a2a4a; }
.risk-bar .segment.mid { background: #2a2a4a; }
.risk-bar .segment.high { background: #2a2a4a; }

.risk-bar .segment.low.active { background: var(--color-safe); }
.risk-bar .segment.mid.active { background: var(--color-warning); }
.risk-bar .segment.high.active { background: var(--color-danger); }

/* ===== 紧急按钮 ===== */
.emergency-btn {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 1.2rem auto;
  padding: 2rem 1rem;
  background: var(--color-danger);
  color: #fff;
  font-size: 1.6rem;
  font-weight: 800;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
  box-shadow: 0 0 0 0 rgba(220,47,2,0.5);
  animation: pulse-emergency 1.5s infinite;
  transition: transform 0.2s;
}

.emergency-btn:active {
  transform: scale(0.95);
}

@keyframes pulse-emergency {
  0% { box-shadow: 0 0 0 0 rgba(220,47,2,0.6); }
  70% { box-shadow: 0 0 0 20px rgba(220,47,2,0); }
  100% { box-shadow: 0 0 0 0 rgba(220,47,2,0); }
}

/* ===== 表单元素 ===== */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.checkbox-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.checkbox-item:last-child {
  border-bottom: none;
}

.checkbox-item input[type="checkbox"] {
  margin-top: 0.25rem;
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.radio-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
}

.radio-item input[type="radio"] {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
}

/* ===== 结果展示区 ===== */
.result-box {
  padding: 1rem;
  border-radius: var(--radius);
  margin: 1rem 0;
  text-align: center;
}

.result-box.low {
  background: rgba(42,157,143,0.15);
  border: 1px solid var(--color-safe);
}

.result-box.mid {
  background: rgba(244,162,97,0.15);
  border: 1px solid var(--color-warning);
}

.result-box.high {
  background: rgba(220,47,2,0.15);
  border: 1px solid var(--color-danger);
}

.result-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 0.4rem;
}

.result-label {
  font-size: 1.3rem;
  font-weight: 700;
}

/* ===== 安全日记 ===== */
.diary-entry {
  background: var(--color-surface);
  border-left: 3px solid var(--color-primary);
  padding: 0.8rem;
  margin-bottom: 0.6rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.85rem;
}

.diary-entry .diary-time {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
}

/* ===== 场景卡片（问答） ===== */
.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin-bottom: 1rem;
}

.scenario-card .scene-label {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

/* ===== 故事小卡片 ===== */
.story-card {
  background: rgba(232,93,4,0.08);
  border-left: 3px solid var(--color-primary);
  padding: 0.8rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 0.8rem 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ===== 案例问答反馈 ===== */
.feedback-box {
  padding: 1rem;
  border-radius: var(--radius);
  margin: 0.8rem 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.feedback-box.correct {
  background: rgba(42,157,143,0.12);
  border: 1px solid var(--color-safe);
}

.feedback-box.wrong {
  background: rgba(220,47,2,0.12);
  border: 1px solid var(--color-danger);
}

/* ===== 放松模式 ===== */
.relax-mode {
  filter: saturate(0.6);
}

.relax-mode .emergency-btn {
  animation: none;
  box-shadow: none;
  background: #666;
}

/* ===== 底部 ===== */
.footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  html { font-size: 15px; }
  .container { padding: 0.8rem 0.8rem 1.5rem; }
  .card { padding: 0.8rem; }
  .nav-bar { padding: 0.4rem 0.6rem; }
  .nav-links a { font-size: 0.78rem; padding: 0.2rem 0.5rem; }
  .emergency-btn { font-size: 1.2rem; padding: 1.5rem 0.8rem; max-width: 100%; }
}

/* ===== 危险评估页面 ===== */
.assess-category {
  margin-bottom: 1rem;
}

.assess-cat-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--color-primary);
}

.assess-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.3rem;
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.hidden { display: none; }