/* ============================================================
   Sellertools 品牌样式 v1.0（全站共享）
   用法：各站 <link rel="stylesheet" href="sellertools.css"> 或内联
   ============================================================ */
:root {
  --st-bg: #0f172a;
  --st-card: #1e293b;
  --st-border: #334155;
  --st-primary: #38bdf8;
  --st-accent: #a78bfa;
  --st-success: #34d399;
  --st-text: #e2e8f0;
  --st-sub: #94a3b8;
  --st-dim: #64748b;
  --st-radius: 16px;
  --st-radius-sm: 10px;
  --st-font: -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
:where(body) { font-family: var(--st-font); background: var(--st-bg); color: var(--st-text); line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
a { color: var(--st-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── 导航 ── */
.st-nav { display: flex; align-items: center; gap: 20px; padding: 14px 28px; border-bottom: 1px solid var(--st-border); background: rgba(15,23,42,.85); position: sticky; top: 0; z-index: 100; backdrop-filter: blur(8px); flex-wrap: wrap; }
.st-nav .st-logo { font-size: 1.15rem; font-weight: 800; letter-spacing: -.3px; background: linear-gradient(90deg, var(--st-primary), var(--st-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; white-space: nowrap; }
.st-nav .st-logo:hover { text-decoration: none; }
.st-nav .st-product { font-weight: 700; font-size: 1rem; white-space: nowrap; }
.st-nav .st-links { display: flex; gap: 18px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.st-nav .st-links a { color: var(--st-sub); font-size: .9rem; }
.st-nav .st-links a:hover { color: var(--st-text); text-decoration: none; }

/* ── 按钮 ── */
.st-btn { display: inline-block; padding: 10px 22px; border-radius: var(--st-radius-sm); font-weight: 600; font-size: .92rem; cursor: pointer; border: none; transition: opacity .15s, transform .15s; }
.st-btn:hover { opacity: .9; transform: translateY(-1px); text-decoration: none; }
.st-btn-primary { background: var(--st-primary); color: #0f172a; }
.st-btn-accent { background: var(--st-accent); color: #0f172a; }
.st-btn-ghost { background: transparent; color: var(--st-primary); border: 1px solid var(--st-primary); }
.st-btn-success { background: var(--st-success); color: #0f172a; }

/* ── 徽章 ── */
.st-badge { display: inline-block; font-size: .7rem; font-weight: 700; padding: 2px 10px; border-radius: 999px; letter-spacing: .5px; }
.st-badge-core { background: rgba(56,189,248,.15); color: var(--st-primary); }
.st-badge-free { background: rgba(52,211,153,.15); color: var(--st-success); }
.st-badge-growth { background: rgba(167,139,250,.15); color: var(--st-accent); }

/* ── 卡片 ── */
.st-card { background: var(--st-card); border: 1px solid var(--st-border); border-radius: var(--st-radius); padding: 26px 24px; }
.st-card-hover { transition: transform .15s, border-color .15s; }
.st-card-hover:hover { transform: translateY(-4px); border-color: var(--st-primary); }

/* ── Hero ── */
.st-hero { text-align: center; padding: 64px 24px 40px; }
.st-hero h1 { font-size: 2rem; letter-spacing: -.5px; margin-bottom: 12px; }
.st-hero p { color: var(--st-sub); font-size: 1.05rem; max-width: 640px; margin: 0 auto; }
.st-hero .st-btn { margin-top: 24px; }

/* ── 区块标题 ── */
.st-section { color: var(--st-dim); font-size: .8rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; margin: 32px 0 14px; }

/* ── 价格卡 ── */
.st-price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; max-width: 960px; margin: 0 auto; padding: 0 24px; }
.st-price-card { background: var(--st-card); border: 1px solid var(--st-border); border-radius: var(--st-radius); padding: 30px 26px; text-align: center; }
.st-price-card.highlight { border-color: var(--st-primary); }
.st-price-card .price { font-size: 2rem; font-weight: 800; margin: 14px 0 6px; }
.st-price-card .price-period { color: var(--st-dim); font-size: .85rem; }
.st-price-card ul { list-style: none; margin: 18px 0 22px; text-align: left; }
.st-price-card ul li { padding: 6px 0; color: var(--st-sub); font-size: .9rem; }
.st-price-card ul li::before { content: '✓ '; color: var(--st-success); font-weight: 700; }

/* ── 页脚 ── */
.st-footer { border-top: 1px solid var(--st-border); padding: 36px 28px 28px; margin-top: 48px; }
.st-footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; max-width: 1080px; margin: 0 auto; }
.st-footer h4 { color: var(--st-sub); font-size: .8rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; }
.st-footer a { display: block; color: var(--st-dim); font-size: .88rem; padding: 3px 0; }
.st-footer a:hover { color: var(--st-text); }
.st-footer .st-brand { font-size: 1.05rem; font-weight: 800; background: linear-gradient(90deg, var(--st-primary), var(--st-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.st-footer .st-tag { color: var(--st-dim); font-size: .82rem; margin-top: 6px; max-width: 240px; }
.st-footer-bottom { text-align: center; color: var(--st-dim); font-size: .8rem; padding-top: 22px; margin-top: 26px; border-top: 1px solid var(--st-border); }

/* ── 通用工具 ── */
.st-container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.st-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.st-muted { color: var(--st-sub); }
.st-center { text-align: center; }