/* ============================================
   防骗小侦探 — 通用样式表
   清新马卡龙 · 圆润可爱
   ============================================ */

/* ---------- 自定义属性（主题色） ---------- */
:root {
  --color-bg-start: #fef9f0;
  --color-bg-end: #fce9f0;
  --color-primary: #6ec6ff;
  --color-primary-dim: #4aa8e0;
  --color-accent: #ff9a9e;
  --color-accent-glow: #ffb3b6;
  --color-success: #7dd87d;
  --color-danger: #f78b8b;
  --color-warning: #f7d07a;
  --color-text: #4a4a5a;
  --color-text-dim: #8a8a9a;
  --color-text-muted: #b0b0be;
  --color-card-bg: #ffffff;
  --color-card-bg-hover: #fafaff;
  --color-card-border: #e8e0f0;
  --color-glass: rgba(255, 255, 255, 0.6);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --shadow-card: 0 4px 16px rgba(160, 140, 200, 0.12);
  --shadow-card-hover: 0 8px 28px rgba(160, 140, 200, 0.20);
  --shadow-glow: 0 0 16px rgba(110, 198, 255, 0.10);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.34, 1.56, 0.64, 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: 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 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-card-border);
  margin-bottom: 40px;
  position: relative;
}

nav::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-accent), transparent);
  opacity: 0.5;
}

nav .logo {
  font-size: 1.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.5px;
}

nav .nav-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

nav .nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav .nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-xl);
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition-smooth);
  border: 1px solid transparent;
  position: relative;
  white-space: nowrap;
}

nav .nav-links a:hover {
  color: var(--color-primary);
  background: rgba(110, 198, 255, 0.10);
  border-color: rgba(110, 198, 255, 0.25);
  transform: translateY(-2px);
}

nav .nav-links a.active {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(110, 198, 255, 0.25);
}

/* ---------- 渐变标题 ---------- */
.gradient-title {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.subtitle {
  color: var(--color-text-dim);
  font-size: 1rem;
  margin-bottom: 32px;
  line-height: 1.5;
}

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

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-xl);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-smooth);
  text-decoration: none;
  font-family: var(--font-stack);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
  color: #fff;
  box-shadow: 0 4px 14px rgba(110, 198, 255, 0.30);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(110, 198, 255, 0.40);
}

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

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-glow));
  color: #fff;
  box-shadow: 0 4px 14px rgba(255, 154, 158, 0.30);
}

.btn-accent:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(255, 154, 158, 0.40);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(110, 198, 255, 0.06);
  transform: translateY(-2px);
}

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

/* ---------- 网格布局 ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.grid-5 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

/* ---------- 首页入口大卡片 ---------- */
.hero-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-xl);
  padding: 40px 28px 36px;
  text-align: center;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  cursor: pointer;
  text-decoration: none;
  color: var(--color-text);
  display: block;
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

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

.hero-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
  background: var(--color-card-bg-hover);
}

.hero-card .icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: block;
  transition: transform var(--transition-smooth);
}

.hero-card:hover .icon {
  transform: scale(1.2) rotate(-5deg);
}

.hero-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  font-weight: 700;
}

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

/* ---------- 表单 ---------- */
input[type="text"],
input[type="number"],
textarea,
select {
  background: rgba(255, 255, 255, 0.8);
  border: 2px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: var(--font-stack);
  width: 100%;
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
  outline: none;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(110, 198, 255, 0.15);
}

/* ---------- 标签 / 徽章 ---------- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-safe {
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

/* ---------- 短信气泡（练判断页面用） ---------- */
.sms-bubble {
  background: rgba(255, 248, 240, 0.8);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.6;
  font-size: 0.95rem;
  box-shadow: 0 2px 8px rgba(160, 140, 200, 0.08);
}

/* ---------- 案例详情（学案例页面用） ---------- */
.case-details {
  margin: 12px 0;
}

.case-details summary {
  cursor: pointer;
  color: var(--color-primary);
  font-weight: 600;
  padding: 6px 0;
  transition: opacity var(--transition-fast);
}

.case-details summary:hover {
  opacity: 0.8;
}

.case-analysis {
  margin-top: 10px;
  padding: 16px;
  background: rgba(110, 198, 255, 0.06);
  border-radius: var(--radius-md);
  line-height: 1.6;
  border-left: 3px solid var(--color-primary);
}

/* ---------- 反馈框（练判断页面用） ---------- */
.feedback-box {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius-md);
  line-height: 1.5;
  font-size: 0.95rem;
}

.feedback-box.correct {
  background: rgba(125, 216, 125, 0.12);
  border: 1px solid rgba(125, 216, 125, 0.3);
}

.feedback-box.wrong {
  background: rgba(247, 139, 139, 0.12);
  border: 1px solid rgba(247, 139, 139, 0.3);
}

/* ---------- 秘籍卡片（存秘籍页面用） ---------- */
.tip-card {
  position: relative;
  padding-right: 48px;
}

.tip-text {
  margin-bottom: 10px;
  line-height: 1.6;
}

.tip-time {
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.btn-delete {
  position: absolute;
  top: 14px;
  right: 16px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--color-card-border);
  background: transparent;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-delete:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* ---------- 提示条 ---------- */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 999;
  animation: toastIn 0.35s ease;
  max-width: 360px;
}

.toast-success {
  background: rgba(34, 197, 94, 0.9);
  color: #fff;
}

.toast-error {
  background: rgba(239, 68, 68, 0.9);
  color: #fff;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  body { padding: 0 12px 32px; }
  .gradient-title { font-size: 1.5rem; }
  nav { flex-direction: column; align-items: flex-start; }
  nav .nav-links { width: 100%; justify-content: flex-start; gap: 4px; }
  nav .nav-links a { padding: 6px 14px; font-size: 0.82rem; }
  .hero-card { padding: 28px 20px 24px; }
  .hero-card .icon { font-size: 2.2rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; gap: 14px; }
  .card { padding: 20px; }
  .btn { padding: 11px 22px; font-size: 0.88rem; }
  .subtitle { font-size: 0.9rem; margin-bottom: 24px; }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }