/* ===== 钞票验钞机 — 通用样式 ===== */
:root {
  --color-primary: #6c5ce7;
  --color-primary-light: #a29bfe;
  --color-secondary: #00cec9;
  --color-accent: #fd79a8;
  --color-warning: #fdcb6e;
  --color-success: #55efc4;
  --color-danger: #ff7675;
  --color-bg-start: #0f0a2e;
  --color-bg-end: #1a1040;
  --color-card: rgba(255, 255, 255, 0.08);
  --color-card-hover: rgba(255, 255, 255, 0.14);
  --color-text: #e8e0f0;
  --color-text-dim: #a090b8;
  --color-border: rgba(255, 255, 255, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --transition: 0.25s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "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 ===== */
.top-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  max-width: 960px;
  margin: 0 auto;
  flex-wrap: wrap;
}

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

.top-nav a:hover {
  background: var(--color-card-hover);
  color: var(--color-text);
  transform: translateY(-1px);
}

.top-nav .nav-title {
  font-weight: 700;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-right: auto;
}

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

/* ===== 卡片 ===== */
.card {
  background: var(--color-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.card:hover {
  background: var(--color-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  text-align: center;
  color: #fff;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-secondary), #00b894);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #e84393);
}

.btn-warning {
  background: linear-gradient(135deg, var(--color-warning), #f39c12);
  color: #1a1040;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

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

/* ===== 渐变标题 ===== */
.gradient-title {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent), var(--color-warning));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  line-height: 1.3;
}

/* ===== 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;
}

/* ===== 积分/分数显示 ===== */
.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.95rem;
  font-weight: 600;
}

.score-badge .num {
  color: var(--color-warning);
  font-size: 1.2rem;
}

/* ===== 进度条 ===== */
.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--color-card);
  border-radius: 10px;
  overflow: hidden;
  margin: 12px 0;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 10px;
  transition: width 0.5s ease;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }

  .top-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-nav .nav-title {
    margin-right: 0;
  }

  .card {
    padding: 18px;
  }

  html {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
}