/* ============================================================
   首页 / 落地页样式
   浅色、克制、产品化：白底 + 中性灰 + 单一蓝色强调色
   ============================================================ */

:root{
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --surface:#ffffff;
  --border:#e4e7ec;
  --border-strong:#d0d5dd;
  --text:#101828;
  --text-2:#475467;
  --text-3:#667085;
  --text-4:#98a2b3;
  --primary:#1d4ed8;
  --primary-hover:#1e40af;
  --primary-soft:#eff4ff;
  --success:#067647;
  --danger:#b42318;
  --danger-soft:#fef3f2;
  --radius:10px;
  --radius-sm:6px;
  --shadow-xs:0 1px 2px rgba(16,24,40,.05);
  --shadow-md:0 4px 16px rgba(16,24,40,.08);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
svg{display:inline-block;vertical-align:-2px;flex:none}
::selection{background:rgba(29,78,216,.16)}

/* ---------- 导航 ---------- */
.navbar{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--border);
}
.navbar.scrolled{box-shadow:var(--shadow-xs)}
.navbar-inner{
  max-width:1160px;margin:0 auto;padding:0 24px;height:64px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.navbar-brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none}
.navbar-brand:hover{text-decoration:none}
.brand-mark{
  width:30px;height:30px;border-radius:8px;background:var(--primary);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;flex:none;
}
.brand-name{font-size:15px;font-weight:600}
.navbar-links{display:flex;align-items:center;gap:24px}
.navbar-links a{font-size:14px;color:var(--text-2);text-decoration:none}
.navbar-links a:hover{color:var(--text);text-decoration:none}
.navbar-actions{display:flex;align-items:center;gap:10px}
.btn-link{font-size:14px;color:var(--text-2);padding:7px 10px;border-radius:var(--radius-sm);text-decoration:none}
.btn-link:hover{background:var(--bg-soft);color:var(--text);text-decoration:none}
.btn-solid{
  display:inline-flex;align-items:center;justify-content:center;
  height:36px;padding:0 16px;border-radius:var(--radius-sm);
  background:var(--primary);color:#fff;font-size:14px;font-weight:500;text-decoration:none;
}
.btn-solid:hover{background:var(--primary-hover);text-decoration:none}
.btn-outline{
  display:inline-flex;align-items:center;justify-content:center;
  height:36px;padding:0 16px;border-radius:var(--radius-sm);
  border:1px solid var(--border-strong);color:var(--text);font-size:14px;text-decoration:none;background:#fff;
}
.btn-outline:hover{background:var(--bg-soft);text-decoration:none}

/* 用户菜单 */
.user-menu{position:relative}
.user-menu-trigger{
  display:flex;align-items:center;gap:8px;height:38px;padding:0 8px;
  background:transparent;border:1px solid transparent;border-radius:var(--radius-sm);
  cursor:pointer;color:var(--text-2);font-size:14px;font-family:inherit;
}
.user-menu-trigger:hover{background:var(--bg-soft);border-color:var(--border)}
.user-avatar{
  width:26px;height:26px;border-radius:50%;background:var(--primary-soft);color:var(--primary);
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;
}
.user-menu-name{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-dropdown{
  display:none;position:absolute;right:0;top:calc(100% + 6px);width:200px;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow-md);padding:6px;z-index:120;
}
.user-dropdown.show{display:block}
.user-dropdown-item{
  display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:var(--radius-sm);
  font-size:13px;color:var(--text-2);text-decoration:none;
}
.user-dropdown-item:hover{background:var(--bg-soft);color:var(--text);text-decoration:none}
.user-dropdown-item.danger{color:var(--danger)}
.user-dropdown-item.danger:hover{background:var(--danger-soft)}
.user-dropdown-divider{height:1px;background:var(--border);margin:6px 0}

/* ---------- Hero ---------- */
.hero{padding:64px 24px 56px}
.hero-grid{
  max-width:1160px;margin:0 auto;display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);
  gap:56px;align-items:start;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;height:24px;padding:0 9px;border-radius:4px;
  background:var(--primary-soft);color:var(--primary);font-size:12px;font-weight:500;
  margin-bottom:18px;
}
.hero-title{font-size:42px;line-height:1.15;letter-spacing:-.025em;margin-bottom:16px}
.hero-subtitle{font-size:16px;color:var(--text-2);line-height:1.7;max-width:520px}
.hero-points{margin-top:24px;display:flex;flex-direction:column;gap:10px}
.hero-points li{display:flex;align-items:center;gap:9px;font-size:14px;color:var(--text-2)}
.hero-points svg{color:var(--success)}

/* ---------- 生成器卡片 ---------- */
.generator-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow-md);
}
.gen-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}
.gen-head h2{font-size:16px}
.gen-hint{font-size:12px;color:var(--text-4)}
.gen-notice{
  display:flex;align-items:center;gap:8px;padding:10px 12px;margin-bottom:14px;
  background:var(--primary-soft);border:1px solid rgba(29,78,216,.16);border-radius:var(--radius-sm);
  font-size:13px;color:var(--text-2);
}
.gen-notice svg{color:var(--primary)}
.field{margin-bottom:14px}
.field:last-of-type{margin-bottom:0}
.field-label{display:block;font-size:12px;font-weight:500;color:var(--text-3);margin-bottom:6px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.url-input-group{display:flex;gap:8px}
.url-input{
  flex:1;min-width:0;height:40px;padding:0 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  background:#fff;color:var(--text);font-size:14px;font-family:inherit;outline:none;
  transition:border-color .12s,box-shadow .12s;
}
.url-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(29,78,216,.12)}
.url-input::placeholder{color:var(--text-4)}
.url-input:disabled{background:var(--bg-soft);color:var(--text-3)}
.btn-generate{
  height:40px;padding:0 18px;border-radius:var(--radius-sm);border:1px solid var(--primary);
  background:var(--primary);color:#fff;font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap;
  font-family:inherit;
}
.btn-generate:hover{background:var(--primary-hover)}
.btn-generate:disabled{opacity:.6;cursor:not-allowed}
.adv-input{
  width:100%;height:38px;padding:0 10px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  background:#fff;color:var(--text);font-size:13px;font-family:inherit;outline:none;
}
.adv-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(29,78,216,.12)}
select.adv-input{
  appearance:none;padding-right:28px;
  background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23667085' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 9px center;
}
.advanced-section{border-top:1px solid var(--border);margin-top:16px;padding-top:12px}
.advanced-toggle{
  display:flex;align-items:center;justify-content:space-between;width:100%;
  background:transparent;border:0;padding:4px 0;font-size:13px;color:var(--text-3);
  cursor:pointer;font-family:inherit;
}
.advanced-toggle:hover{color:var(--text)}
.advanced-arrow{display:inline-flex;transition:transform .15s}
.advanced-body{display:none;padding-top:12px}

/* 结果 */
.result-card{
  display:none;margin-top:14px;padding:14px;border:1px solid var(--border);
  border-radius:var(--radius-sm);background:var(--bg-soft);
}
.result-row{display:flex;align-items:center;gap:10px}
.result-url{flex:1;min-width:0;font-size:14px;font-weight:500;color:var(--primary);word-break:break-all}
.result-msg{font-size:12px;color:var(--text-4);margin-top:6px}
.btn-copy{
  height:30px;padding:0 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);
  background:#fff;color:var(--text-2);font-size:12px;cursor:pointer;font-family:inherit;
}
.btn-copy:hover{background:var(--bg-soft)}
.btn-copy.copied{color:var(--success);border-color:var(--success)}
.qr-area{display:none;margin-top:14px;text-align:center}
.qr-box{display:inline-block;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px}
.qr-box img{width:150px;height:150px;display:block}
.qr-label{font-size:12px;color:var(--text-4);margin-top:6px}
.error-card{
  display:none;margin-top:12px;padding:10px 12px;border-radius:var(--radius-sm);
  background:var(--danger-soft);color:var(--danger);font-size:13px;
}

/* ---------- 数据条 ---------- */
.stats-strip{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stats-inner{
  max-width:1160px;margin:0 auto;padding:28px 24px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.stat-item{text-align:center;border-right:1px solid var(--border)}
.stat-item:last-child{border-right:0}
.stat-value{font-size:28px;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat-label{font-size:13px;color:var(--text-3);margin-top:2px}

/* ---------- 内容区块 ---------- */
.section{padding:72px 24px}
.section-alt{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-head{max-width:1160px;margin:0 auto 36px;text-align:center}
.section-head h2{font-size:26px;letter-spacing:-.02em;margin-bottom:8px}
.section-head p{font-size:15px;color:var(--text-3)}
.feature-grid{
  max-width:1160px;margin:0 auto;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;
}
.feature{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.feature-icon{
  width:36px;height:36px;border-radius:8px;background:var(--primary-soft);color:var(--primary);
  display:inline-flex;align-items:center;justify-content:center;margin-bottom:12px;
}
.feature h3{font-size:15px;margin-bottom:6px}
.feature p{font-size:13.5px;color:var(--text-3);line-height:1.7}

/* 步骤 */
.steps{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.step{text-align:center}
.step-num{
  width:36px;height:36px;border-radius:50%;background:#fff;border:1px solid var(--border-strong);
  color:var(--text-2);display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:600;margin:0 auto 12px;
}
.step h3{font-size:15px;margin-bottom:6px}
.step p{font-size:13.5px;color:var(--text-3);line-height:1.7}

/* ---------- CTA ---------- */
.cta{padding:0 24px 72px}
.cta-inner{
  max-width:1160px;margin:0 auto;padding:36px 40px;border-radius:12px;
  background:#0f172a;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.cta-inner h2{font-size:22px;margin-bottom:6px;color:#fff}
.cta-inner p{font-size:14px;color:#94a3b8}
.cta-actions{display:flex;gap:10px;flex:none}
.cta .btn-solid{background:#fff;color:#101828;border-color:#fff}
.cta .btn-solid:hover{background:#e5e7eb}
.cta .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.cta .btn-outline:hover{background:rgba(255,255,255,.08)}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);background:#fff}
.footer-inner{
  max-width:1160px;margin:0 auto;padding:24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.footer-brand{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500}
.footer-brand .brand-mark{width:24px;height:24px;border-radius:6px}
.footer-links{display:flex;gap:20px}
.footer-links a{font-size:13px;color:var(--text-3);text-decoration:none}
.footer-links a:hover{color:var(--text);text-decoration:none}
.footer-copy{font-size:12px;color:var(--text-4)}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-title{font-size:34px}
  .navbar-links{display:none}
  .steps{grid-template-columns:1fr;gap:26px}
  .cta-inner{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .hero{padding:40px 16px}
  .hero-title{font-size:28px}
  .section{padding:52px 16px}
  .stats-inner{grid-template-columns:1fr 1fr;gap:20px}
  .stat-item:nth-child(2){border-right:0}
  .field-row{grid-template-columns:1fr}
  .url-input-group{flex-direction:column}
  .navbar-inner{padding:0 16px}
  .user-menu-name{display:none}
  .footer-inner{flex-direction:column;align-items:flex-start}
}