/* ===== 设计 Token（商务蓝） ===== */
:root {
  --color-primary: #165DFF;
  --color-primary-dark: #0E42C8;
  --color-primary-soft: #E8F0FF;
  --color-bg: #F5F7FB;
  --color-surface: #FFFFFF;
  --color-text: #1D2129;
  --color-muted: #5C6470;
  --color-border: #E5E8EF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 20px rgba(22, 93, 255, 0.10);
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --tap: 44px;
  --maxw: 1100px;
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  padding-bottom: calc(var(--tap) + 24px); /* 给吸底导航留白 */
}
h1, h2, h3 { line-height: 1.3; margin: 0 0 var(--space-3); font-weight: 700; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.45rem; }
p { margin: 0 0 var(--space-3); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 2px; border-radius: 4px; }

/* ===== 布局 ===== */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-3); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--color-primary); color: #fff; padding: 10px 16px; z-index: 100; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

/* ===== 顶部 Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--color-text); }
.brand .logo { width: 30px; height: 30px; border-radius: 8px; }
.top-nav { display: flex; gap: var(--space-1); }
.top-nav a {
  display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 12px;
  color: var(--color-muted); font-weight: 600; border-radius: var(--radius-sm);
}
.top-nav a:hover { color: var(--color-primary); background: var(--color-primary-soft); text-decoration: none; }
.top-nav a.is-active { color: var(--color-primary); }

/* ===== 主体 Hero / 卡片 ===== */
main { padding: var(--space-5) 0; }
.hero { text-align: center; margin-bottom: var(--space-5); }
.hero h1 { color: var(--color-primary-dark); }
.hero .tagline { color: var(--color-muted); font-size: 1.1rem; margin: 0 auto; max-width: 640px; }
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-4); box-shadow: var(--shadow-sm);
}

/* ===== 表单 ===== */
.field { margin-bottom: var(--space-3); }
.field > label { display: block; font-weight: 600; margin-bottom: var(--space-1); }
.input, .select {
  width: 100%; min-height: var(--tap); padding: 10px 14px;
  font-size: 1rem; color: var(--color-text);
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-md);
}
.input:focus, .select:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px var(--color-primary-soft); }
.hint { color: var(--color-muted); font-size: 0.85rem; margin-top: 6px; }

/* 字数分段控件 */
.seg { display: flex; gap: 8px; flex-wrap: wrap; }
.seg label {
  flex: 1 1 0; min-width: 64px; min-height: var(--tap);
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  cursor: pointer; font-weight: 600; color: var(--color-muted); background: #fff;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-soft); color: var(--color-primary-dark); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--tap); padding: 0 var(--space-4);
  background: var(--color-primary); color: #fff; font-size: 1.05rem; font-weight: 700;
  border: none; border-radius: var(--radius-md); cursor: pointer; width: 100%;
  transition: background .15s ease;
}
.btn:hover { background: var(--color-primary-dark); }
.btn:active { transform: translateY(1px); }

/* 最近输入 chips */
.recent { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: var(--space-2); }
.recent .recent-label { color: var(--color-muted); font-size: 0.85rem; }
.chip {
  min-height: 36px; padding: 0 14px; border-radius: 999px;
  border: 1px solid var(--color-border); background: #fff; color: var(--color-primary);
  font-weight: 600; cursor: pointer;
}
.chip:hover { background: var(--color-primary-soft); }

/* ===== 结果 ===== */
#results { margin-top: var(--space-4); }
.results-title { color: var(--color-primary-dark); }
.name-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr; gap: 12px; }
.name-card {
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: var(--space-3); background: #fff; box-shadow: var(--shadow-sm);
}
.name-main { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.name-text { font-size: 1.6rem; font-weight: 800; color: var(--color-primary-dark); letter-spacing: 2px; }
.copy-btn {
  min-height: 40px; padding: 0 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--color-primary); background: #fff; color: var(--color-primary);
  font-weight: 600; cursor: pointer; white-space: nowrap;
}
.copy-btn:hover { background: var(--color-primary-soft); }
.name-yuyi { color: var(--color-muted); font-size: 0.95rem; margin: 8px 0 0; }
.name-yuyi .yuyi-toggle { background: none; border: none; color: var(--color-primary); cursor: pointer; font-size: 0.85rem; padding: 0 4px; font-weight: 600; }
.name-yuyi .yuyi-toggle:hover { text-decoration: underline; }
.notice { background: #FFF4E5; border: 1px solid #FFD8A8; color: #B45309; padding: 12px 16px; border-radius: var(--radius-md); }
.hint--warn { color: #B45309; }

/* 结果头部：标题 + 换一批 */
.results-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.results-head .results-title { margin: 0; }
.btn--ghost { background: #fff; color: var(--color-primary); border: 1px solid var(--color-primary); min-height: var(--tap); padding: 0 18px; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; }
.btn--ghost:hover { background: var(--color-primary-soft); }

/* 加载骨架屏 */
.name-card.skeleton { pointer-events: none; }
.sk-line { border-radius: 6px; background: linear-gradient(90deg, #eef1f6 25%, #e2e7f0 37%, #eef1f6 63%); background-size: 400% 100%; animation: sk 1.2s ease-in-out infinite; }
.sk-title { height: 28px; width: 50%; margin-bottom: 12px; }
.sk-text { height: 14px; width: 90%; }
@keyframes sk { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* Toast 轻提示 */
.toast { position: fixed; left: 50%; bottom: 92px; transform: translateX(-50%) translateY(10px); background: rgba(20, 30, 50, .92); color: #fff; padding: 10px 18px; border-radius: 999px; font-size: .9rem; max-width: 90vw; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 80; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== FAQ ===== */
.faq { margin-top: var(--space-5); }
.faq details { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 0 var(--space-3); background: #fff; margin-bottom: 10px; }
.faq summary { cursor: pointer; padding: var(--space-3) 0; font-weight: 600; }
.faq summary::-webkit-details-marker { color: var(--color-primary); }
.faq p { padding-bottom: var(--space-3); color: var(--color-muted); }

/* ===== 文章 ===== */
.article h2 { color: var(--color-primary-dark); margin-top: var(--space-4); }
.article ul { padding-left: 1.2em; }
.article li { margin-bottom: 8px; }

/* ===== 页脚 ===== */
.site-footer { background: #fff; border-top: 1px solid var(--color-border); padding: var(--space-4) 0; color: var(--color-muted); font-size: 0.9rem; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-links a { color: var(--color-muted); }

/* ===== 三栏吸底导航（仅 3 项） ===== */
.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: flex; background: #fff; border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.05);
}
.bottom-nav a {
  flex: 1; min-height: calc(var(--tap) + 12px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  color: var(--color-muted); font-size: 0.8rem; font-weight: 600;
}
.bottom-nav a.is-active { color: var(--color-primary); }
.bottom-nav a .ic { font-size: 1.2rem; line-height: 1; }

/* ===== 响应式断点：360 / 768 / 1024 / 1440 ===== */
@media (max-width: 767px) {
  h1 { font-size: 1.6rem; }
  .hero .tagline { font-size: 1rem; }
  .card { padding: var(--space-3); }
}
@media (min-width: 768px) {
  .top-nav { gap: var(--space-2); }
  .hero { margin-bottom: var(--space-5); }
  .name-list { grid-template-columns: 1fr 1fr; }   /* 平板：每行 2 个 */
}
@media (min-width: 1024px) {
  .name-list { grid-template-columns: repeat(3, 1fr); }  /* 电脑：每行 3 个 */
}
@media (min-width: 1440px) {
  :root { --maxw: 1200px; }
}

/* 吸底导航：所有断点均「拉满屏宽」（取消宽屏 520px 胶囊居中限制） */
@media (min-width: 1024px) {
  .bottom-nav {
    left: 0; right: 0; width: 100%; max-width: none;
    margin: 0; transform: none; border-radius: 0;
  }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ===== 404 页面辅助 ===== */
.center-block { text-align: center; padding: 80px 0; }
.btn--inline { max-width: 240px; margin: 0 auto; display: inline-flex; }