/* codex: 2026-09-23 全局页面排版、深空星宿主题、色彩系统与响应式布局 */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #121829;
  --bg-card: rgba(22, 30, 50, 0.75);
  --bg-card-hover: rgba(30, 42, 70, 0.85);
  --border-color: rgba(56, 189, 248, 0.18);
  --border-glow: rgba(56, 189, 248, 0.4);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.35);
  --accent-gold: #fde047;
  --accent-rose: #f43f5e;
  --accent-purple: #c084fc;
  --accent-green: #22c55e;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.2);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family);
  background: radial-gradient(circle at 50% 20%, #161f36 0%, #0a0e1a 75%, #05070d 100%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

/* 顶部导航栏 */
.top-header {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  font-size: 26px;
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.brand-text h1 {
  font-size: 19px;
  font-weight: 700;
  background: linear-gradient(135deg, #ffffff 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text p {
  font-size: 11px;
  color: var(--text-muted);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* 通用按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  outline: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
}

.btn-subtle {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border-color: rgba(255, 255, 255, 0.1);
}

.btn-subtle:hover, .btn-subtle.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-danger {
  background: rgba(244, 63, 94, 0.15);
  color: #fda4af;
  border-color: rgba(244, 63, 94, 0.3);
}

.btn-danger:hover {
  background: rgba(244, 63, 94, 0.3);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-home {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 4px;
}

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

/* 主内容双栏布局 */
.main-wrapper {
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 20px 32px;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 20px;
  flex: 1;
}

/* 关卡阶梯切换条 */
.level-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.level-bar::-webkit-scrollbar {
  display: none;
}

.level-btn {
  flex: 1;
  min-width: 80px;
  padding: 7px 10px;
  font-size: 12.5px;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.level-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.level-btn.active {
  background: var(--primary);
  color: #0a0e1a;
  box-shadow: 0 2px 10px var(--primary-glow);
}

/* 底部状态条与页脚 */
.footer-note {
  text-align: center;
  padding: 16px;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .main-wrapper {
    grid-template-columns: 1fr;
    padding: 12px 16px 28px;
  }
}

@media (max-width: 768px) {
  .top-header {
    padding: 8px 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .brand {
    justify-content: space-between;
    width: 100%;
  }
  .brand-text h1 {
    font-size: 15px;
  }
  .brand-text p {
    display: none;
  }
  .nav-tools {
    display: flex;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 6px;
    padding-bottom: 2px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    width: 100%;
  }
  .nav-tools::-webkit-scrollbar {
    display: none;
  }
  .nav-tools .btn {
    flex-shrink: 0;
    padding: 6px 10px;
    font-size: 12px;
  }
  .main-wrapper {
    padding: 8px 10px 24px;
    gap: 12px;
  }
  .level-btn {
    min-width: 72px;
    padding: 6px 8px;
    font-size: 12px;
  }
}