/* styles.css — 本地生成器样式（无外部依赖，系统字体）
 * 设计令牌(D Design Tokens)以 CSS 变量集中管理，浅色为默认，
 * 深色通过 @media (prefers-color-scheme) 与 [data-theme="dark"] 两套规则提供，
 * 视觉连续性由统一的中性 slate 色阶 + 主蓝/翠绿强调色保证。 */
* { box-sizing: border-box; }

:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1f2933;
  --text-strong: #111827;
  --label: #374151;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --divider: #f1f3f5;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --on-primary: #ffffff;
  --success: #047857;
  --hover-surface: #f4f6f8;
  --shadow: 0 1px 2px rgba(0,0,0,0.04);
}

/* 自动(跟随系统)：未显式设置 data-theme 时，系统为深色则启用深色令牌 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e5e7eb;
  --text-strong: #f9fafb;
  --label: #cbd5e1;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --border: #334155;
  --border-strong: #475569;
  --divider: #334155;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --on-primary: #ffffff;
  --success: #34d399;
  --hover-surface: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.5);
  }
}
/* 手动深色：始终覆盖系统偏好 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e5e7eb;
  --text-strong: #f9fafb;
  --label: #cbd5e1;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --border: #334155;
  --border-strong: #475569;
  --divider: #334155;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --on-primary: #ffffff;
  --success: #34d399;
  --hover-surface: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.5);
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}
.app { max-width: 920px; margin: 0 auto; padding: 24px 16px 48px; }
.app-header h1 { margin: 0 0 4px; font-size: 24px; color: var(--text-strong); }
.subtitle { margin: 0 0 20px; color: var(--text-muted); font-size: 13px; }

.controls {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-bottom: 20px;
}
.controls label { display: flex; flex-direction: column; font-size: 13px; color: var(--label); gap: 4px; }
.controls select, .controls button {
  height: 38px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--surface); font-size: 14px; color: var(--text-strong); cursor: pointer;
}
.controls button { background: var(--primary); color: var(--on-primary); border-color: var(--primary); font-weight: 600; }
.controls button.secondary { background: var(--surface); color: var(--primary); border-color: var(--primary); }
.controls button:hover { filter: brightness(0.97); }
.controls input.age-input {
  height: 38px; padding: 0 8px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--surface); font-size: 14px; color: var(--text-strong); width: 88px;
}
.controls input.email-input {
  height: 38px; padding: 0 8px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--surface); font-size: 14px; color: var(--text-strong); width: 160px;
}
.controls input.age-num { width: 56px; }
.hidden { display: none !important; }

.results { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 10px; font-size: 15px; color: var(--text-strong); }
.card table { width: 100%; border-collapse: collapse; font-size: 13px; }
.card th, .card td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--divider); vertical-align: top; }
.card th { width: 84px; color: var(--text-muted); font-weight: 600; white-space: nowrap; }
.card td { color: var(--text-strong); word-break: break-all; }

.status {
  margin-left: auto; font-size: 13px; color: var(--success); opacity: 0;
  transition: opacity .2s; align-self: center;
}
.status.show { opacity: 1; }

.disclaimer { margin-top: 24px; font-size: 12px; color: var(--text-faint); }

/* 分段控件：语言 / 主题 共用同一套设计令牌（圆角/边框/主蓝），保证视觉一致 */
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.header-actions { display: inline-flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.lang-switch, .theme-switch {
  display: inline-flex; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; background: var(--surface);
}
.lang-switch .lang-opt, .theme-switch .theme-opt {
  border: 0; background: transparent; height: 34px; padding: 0 14px;
  font-size: 13px; color: var(--label); cursor: pointer; line-height: 1; font-family: inherit;
}
.lang-switch .lang-opt + .lang-opt, .theme-switch .theme-opt + .theme-opt { border-left: 1px solid var(--border-strong); }
.lang-switch .lang-opt:hover, .theme-switch .theme-opt:hover { background: var(--hover-surface); }
.lang-switch .lang-opt.active, .theme-switch .theme-opt.active { background: var(--primary); color: var(--on-primary); font-weight: 600; }
.lang-switch .lang-opt.active:hover, .theme-switch .theme-opt.active:hover { background: var(--primary-hover); }

/* 主题切换：色彩平滑过渡，营造无缝(seamless)的视觉连续性 */
body, .app, .controls, .card, .card th, .card td, .status, .disclaimer,
.controls select, .controls button, .controls input,
.lang-switch, .lang-switch .lang-opt, .theme-switch, .theme-switch .theme-opt {
  transition: background-color .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease;
}

::selection { background: var(--primary); color: var(--on-primary); }