/* ========================================
   独居安全岛 — 通用样式表
   暗色主题 · 童趣可爱 · 安全警示色
   ======================================== */

/* ---------- CSS 自定义属性 ---------- */
:root {
  --color-bg-start: #eef3ff;
  --color-bg-end: #dbe6ff;
  --color-surface: rgba(255, 255, 255, 0.75);
  --color-surface-hover: rgba(255, 255, 255, 0.95);
  --color-card-bg: rgba(255, 255, 255, 0.85);
  --color-primary: #7c6cf0;
  --color-primary-hover: #6a58e8;
  --color-accent: #ffb74d;
  --color-danger: #ef5350;
  --color-warning: #ffa726;
  --color-safe: #43a047;
  --color-text: #3a3a5c;
  --color-text-bright: #2b2b4d;
  --color-text-dim: #7a7aa8;
  --color-border: rgba(124, 108, 240, 0.18);
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --shadow-card: 0 8px 28px rgba(124, 108, 240, 0.16);
  --shadow-hover: 0 14px 40px rgba(124, 108, 240, 0.26), 0 0 0 1px rgba(124,108,240,0.10);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 夜间护眼模式 ---------- */
[data-theme="dark"] {
  --color-bg-start: #1a1a2e;
  --color-bg-end: #16213e;
  --color-surface: rgba(30, 30, 50, 0.75);
  --color-surface-hover: rgba(40, 40, 65, 0.95);
  --color-card-bg: rgba(30, 30, 52, 0.88);
  --color-text: #c8c8e0;
  --color-text-bright: #e8e8f5;
  --color-text-dim: #8a8ab0;
  --color-border: rgba(124, 108, 240, 0.30);
  --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(124,108,240,0.20);
}
[data-theme="dark"] body {
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(139,124,247,0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(100,181,246,0.10), transparent 55%),
    linear-gradient(160deg, var(--color-bg-start) 0%, #1e2440 45%, var(--color-bg-end) 100%);
}
/* 夜间模式下：所有卡片/面板/按钮背景统一换成深色，避免浅色文字配白底看不清 */
[data-theme="dark"] .card,
[data-theme="dark"] .panel,
[data-theme="dark"] .nav-bar,
[data-theme="dark"] .scene-btn,
[data-theme="dark"] .story-panel,
[data-theme="dark"] .option-btn,
[data-theme="dark"] .case-card,
[data-theme="dark"] .check-item,
[data-theme="dark"] .question-card,
[data-theme="dark"] .shop-card,
[data-theme="dark"] .login-card,
[data-theme="dark"] .profile-card,
[data-theme="dark"] .knowledge-card,
[data-theme="dark"] .quiz-card,
[data-theme="dark"] .checklist-card,
[data-theme="dark"] .leaderboard-card,
[data-theme="dark"] .sos-card,
[data-theme="dark"] .ai-card {
  background: var(--color-card-bg) !important;
  border-color: var(--color-border) !important;
}

/* 夜间模式切换按钮 */
.theme-toggle {
  background: rgba(124,108,240,0.15);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover {
  transform: scale(1.12);
  background: rgba(124,108,240,0.28);
}

/* 窄屏下按钮保持圆点，不挤占导航 */
@media (max-width: 600px) {
  .theme-toggle {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(139,124,247,0.18), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(100,181,246,0.20), transparent 55%),
    linear-gradient(160deg, var(--color-bg-start) 0%, #e4ecff 45%, var(--color-bg-end) 100%);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.65;
  padding: 0 16px;
  position: relative;
  overflow-x: hidden;
}

/* 顶部蕾丝 + 蓝色纱布装饰 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 90px;
  z-index: 10;
  pointer-events: none;
  /* 蓝色纱布层 */
  background:
    /* 蕾丝花纹 — 重复的半透明花纹 */
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 18px,
      rgba(255,255,255,0.12) 18px,
      rgba(255,255,255,0.12) 20px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 38px,
      rgba(255,255,255,0.08) 38px,
      rgba(255,255,255,0.08) 40px
    ),
    /* 蕾丝小圆点 */
    radial-gradient(circle at 10px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 30px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 50px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 70px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 90px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 110px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 130px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 150px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 170px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    radial-gradient(circle at 190px 15px, rgba(255,255,255,0.2) 2px, transparent 3px),
    /* 蓝色渐变纱布 — 从顶部垂下来 */
    linear-gradient(
      180deg,
      rgba(100,181,246,0.25) 0%,
      rgba(100,181,246,0.15) 30%,
      rgba(100,181,246,0.06) 60%,
      transparent 100%
    );
  /* 蕾丝底边波浪 */
  -webkit-mask-image: linear-gradient(
    180deg,
    #000 0%,
    #000 60%,
    transparent 100%
  );
  mask-image: linear-gradient(
    180deg,
    #000 0%,
    #000 60%,
    transparent 100%
  );
}

/* 蕾丝波浪底边 — 用第二个伪元素画 */
body::after {
  content: '';
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  height: 30px;
  z-index: 11;
  pointer-events: none;
  background:
    radial-gradient(circle at 5px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 25px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 45px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 65px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 85px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 105px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 125px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 145px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 165px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    radial-gradient(circle at 185px 15px, rgba(255,255,255,0.25) 3px, transparent 4px),
    /* 蕾丝波浪线 */
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 16px,
      rgba(255,255,255,0.18) 16px,
      rgba(255,255,255,0.18) 18px
    );
  -webkit-mask-image: linear-gradient(
    180deg,
    #000 0%,
    transparent 100%
  );
  mask-image: linear-gradient(
    180deg,
    #000 0%,
    transparent 100%
  );
}

/* 背景装饰光斑 */
body::before {
  content: '';
  position: fixed;
  top: -120px;
  right: -80px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(139,124,247,0.16) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: floatBlob 8s ease-in-out infinite;
}
body::after {
  content: '';
  position: fixed;
  bottom: -100px;
  left: -60px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(100,181,246,0.14) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: floatBlob 10s ease-in-out infinite reverse;
}
@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(20px, -15px) scale(1.05); }
  66% { transform: translate(-10px, 10px) scale(0.95); }
}

/* ---------- 渐变标题 ---------- */
.gradient-title {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #b3a6ff, #8b7cf7, #64b5f6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
  text-shadow: 0 2px 24px rgba(139,124,247,0.25);
}

/* ---------- 首页英雄区 ---------- */
.hero-icon-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 8px;
}
.hero-icon {
  font-size: 5rem;
  display: inline-block;
  animation: heroBounce 2s ease-in-out infinite;
}
.hero-wave {
  font-size: 3rem;
  display: inline-block;
  animation: heroBounce 2s ease-in-out 0.3s infinite;
}
@keyframes heroBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ---------- 导航栏 ---------- */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  max-width: 900px;
  margin: 0 auto 28px;
  background: var(--color-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(124,108,240,0.2);
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 1;
  box-shadow: 0 8px 28px rgba(124,108,240,0.14);
}

.nav-bar .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-bright);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition);
}
.nav-bar .logo:hover {
  transform: scale(1.04);
}

.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 24px;
  transition: all var(--transition);
}

.nav-links a:hover {
  background: linear-gradient(135deg, rgba(124,108,240,0.14), rgba(100,181,246,0.12));
  color: var(--color-text-bright);
  transform: translateY(-1px);
}

.nav-links a.active {
  background: linear-gradient(135deg, rgba(124,108,240,0.18), rgba(100,181,246,0.16));
  color: var(--color-text-bright);
  box-shadow: 0 2px 12px rgba(124,108,240,0.22);
}

/* ---------- 卡片 ---------- */
.card {
  background: linear-gradient(160deg, rgba(255,255,255,0.92), rgba(255,255,255,0.78));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(124,108,240,0.2);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}

/* 卡片背景大 emoji */
.card::after {
  content: '';
  position: absolute;
  right: -10px;
  bottom: -15px;
  font-size: 6rem;
  opacity: 0.06;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}
.card:nth-child(1)::after { content: '🎭'; }
.card:nth-child(2)::after { content: '📞'; }
.card:nth-child(3)::after { content: '🏆'; }

/* 卡片顶部装饰线 */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--color-primary), #64b5f6);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(124,108,240,0.4);
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(255,255,255,0.88));
}
.card:hover::before {
  opacity: 1;
}
.card:hover::after {
  opacity: 0.12;
  transform: scale(1.15) rotate(-5deg);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  font-size: 0.95rem;
  font-weight: 700;
  border: none;
  border-radius: 36px;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  color: var(--color-text-bright);
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(30,20,90,0.35);
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.25), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.btn:hover::after {
  opacity: 1;
}

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

.btn-primary {
  background: linear-gradient(135deg, #8b7cf7, #5a4bd6);
  color: #fff;
  box-shadow: 0 6px 20px rgba(139,124,247,0.4);
}
.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 28px rgba(139,124,247,0.55);
}

.btn-danger {
  background: linear-gradient(135deg, #ef5350, #e53935);
  box-shadow: 0 4px 16px rgba(239,83,80,0.3);
}
.btn-danger:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(239,83,80,0.45);
}

.btn-warning {
  background: linear-gradient(135deg, #ffa726, #fb8c00);
  color: #1a1a2e;
  box-shadow: 0 4px 16px rgba(255,167,38,0.3);
}
.btn-warning:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(255,167,38,0.45);
}

.btn-safe {
  background: linear-gradient(135deg, #66bb6a, #43a047);
  box-shadow: 0 4px 16px rgba(102,187,106,0.3);
}
.btn-safe:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(102,187,106,0.45);
}

/* ---------- 容器 ---------- */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: 48px;
  position: relative;
  z-index: 1;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin: 28px 0;
}

/* ---------- 首页小贴士横幅 ---------- */
.tip-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  border: 1px solid rgba(124,108,240,0.22);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(124,108,240,0.12);
}
.tip-banner:hover {
  background: linear-gradient(135deg, rgba(255,255,255,0.98), rgba(255,255,255,0.88));
  border-color: rgba(124,108,240,0.4);
  transform: translateY(-2px);
}
.tip-icon {
  font-size: 2.2rem;
  flex-shrink: 0;
  animation: heroBounce 2.5s ease-in-out infinite;
}
.tip-banner strong {
  display: block;
  color: var(--color-warning);
  font-size: 1rem;
  margin-bottom: 2px;
}
.tip-banner p {
  color: var(--color-text-dim);
  font-size: 0.9rem;
  margin: 0;
}

/* ---------- 知识卡片内样式 ---------- */
.knowledge-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  backdrop-filter: blur(8px);
  border: 1px solid rgba(124,108,240,0.2);
  border-left: 5px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 16px;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(124,108,240,0.12);
}
.knowledge-card:hover {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(255,255,255,0.88));
  transform: translateX(4px);
  box-shadow: 0 6px 24px rgba(124,108,240,0.2);
}

.knowledge-card.danger {
  border-left-color: var(--color-danger);
}
.knowledge-card.warning {
  border-left-color: var(--color-warning);
}
.knowledge-card.safe {
  border-left-color: var(--color-safe);
}

.knowledge-card h3 {
  color: var(--color-text-bright);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.knowledge-card p {
  font-size: 0.93rem;
  color: var(--color-text-dim);
  line-height: 1.75;
}

/* ---------- 游戏选项按钮 ---------- */
.option-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 16px 20px;
  margin-bottom: 12px;
  background: linear-gradient(160deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  border: 1px solid rgba(124,108,240,0.22);
  border-radius: var(--radius-md);
  color: var(--color-text-bright);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(124,108,240,0.12);
}

.option-btn:hover {
  background: linear-gradient(160deg, rgba(255,255,255,0.98), rgba(255,255,255,0.88));
  border-color: rgba(124,108,240,0.4);
  transform: translateX(8px);
  box-shadow: 0 6px 24px rgba(124,108,240,0.2);
}

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

/* ---------- 结果框 ---------- */
.result-box {
  background: linear-gradient(160deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 20px;
  border: 1px solid rgba(124,108,240,0.2);
  min-height: 60px;
  box-shadow: 0 4px 16px rgba(124,108,240,0.12);
}

.result-box .result-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.result-box .result-text {
  font-size: 0.95rem;
  color: var(--color-text-dim);
  line-height: 1.8;
}

/* ---------- 入场动画 ---------- */
.fade-in {
  animation: fadeInUp 0.55s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }
.fade-in-delay-4 { animation-delay: 0.4s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 樱花飘落 ---------- */
.sakura {
  position: fixed;
  top: -20px;
  pointer-events: none;
  z-index: 5;
  animation: sakuraFall linear infinite;
  opacity: 0.8;
}
@keyframes sakuraFall {
  0% {
    transform: translateY(-5vh) translateX(0) rotate(0deg);
    opacity: 0;
  }
  10% { opacity: 0.9; }
  100% {
    transform: translateY(110vh) translateX(var(--drift, 40px)) rotate(360deg);
    opacity: 0.6;
  }
}

/* ---------- 返回顶部 ---------- */
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 18px;
  padding: 6px 14px;
  border-radius: 20px;
  transition: all var(--transition);
}

.back-home:hover {
  color: var(--color-primary-hover);
  background: rgba(100,181,246,0.1);
}

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .gradient-title {
    font-size: 1.5rem;
  }

  .nav-bar {
    flex-direction: column;
    gap: 12px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
  }

  .nav-links a {
    font-size: 0.82rem;
    padding: 6px 12px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 22px 18px;
  }

  .option-btn {
    padding: 14px 16px;
    font-size: 0.95rem;
  }

  .container {
    padding-bottom: 32px;
  }
}