/* ============================================
   DeepSeek Theme 3 - 娓愬彉钃?+ 绉戞妧鎰?| Impeccable-driven
   OKLCH | Committed Blue | Glass accents
   ============================================ */

:root {
  --brand:        oklch(0.55 0.20 250);
  --brand-hover:  oklch(0.47 0.19 250);
  --brand-glow:   oklch(0.64 0.21 250);
  --brand-light:  oklch(0.93 0.03 250);
  --brand-surface: oklch(0.97 0.01 250);
  --brand-deep:   oklch(0.30 0.10 255);

  --bg:           oklch(1 0 0);
  --bg-alt:       oklch(0.975 0.005 250);

  --ink:          oklch(0.12 0.01 260);
  --ink-secondary: oklch(0.42 0.01 260);
  --ink-muted:    oklch(0.60 0.01 260);
  --ink-inverse:  oklch(1 0 0);

  --border:       oklch(0.89 0.005 250);
  --border-light: oklch(0.94 0.003 250);

  --glass-bg:     oklch(1 0 0 / 0.08);
  --glass-border: oklch(1 0 0 / 0.15);

  --green:  oklch(0.58 0.16 155);
  --amber:  oklch(0.72 0.14 80);

  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --mono: "SF Mono","Cascadia Code","Consolas",monospace;
  --w: 1120px;
  --radius: 8px;
  --radius-sm: 6px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);font-size:0.9375rem;line-height:1.6;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none;transition:color 0.15s}
a:hover{color:var(--brand-hover)}
::selection{background:var(--brand-light);color:var(--ink)}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:3px}

.wrap{max-width:var(--w);margin:0 auto;padding:0 28px}

/* ---- Nav: glass on gradient ---- */
.navbar{
  position:sticky;top:0;z-index:100;
  background:oklch(0.15 0.03 255 / 0.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid oklch(1 0 0 / 0.08);
}
.navbar .wrap{display:flex;align-items:center;justify-content:space-between;height:56px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.1rem;font-weight:700;color:var(--ink-inverse)}
.nav-logo svg{width:28px;height:28px;flex-shrink:0}
.nav-links{display:flex;gap:28px}
.nav-links a{
  font-size:0.85rem;font-weight:500;color:oklch(1 0 0 / 0.65);padding:4px 0;
  transition:color 0.15s;
}
.nav-links a:hover,.nav-links a.active{color:var(--ink-inverse)}

/* ---- Hero: deep gradient ---- */
.hero{
  padding:100px 0 80px;
  background:linear-gradient(160deg,oklch(0.15 0.03 255) 0%,oklch(0.28 0.08 252) 50%,oklch(0.42 0.15 248) 100%);
  color:var(--ink-inverse);
  position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 30% 50%,oklch(0.50 0.18 240 / 0.25) 0%,transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;right:-80px;top:-80px;
  width:400px;height:400px;border-radius:50%;
  border:1px solid oklch(1 0 0 / 0.06);
  pointer-events:none;
}
.hero .wrap{position:relative;z-index:1}
.hero h1{font-size:2.5rem;font-weight:800;letter-spacing:-0.03em;line-height:1.15;margin-bottom:14px}
.hero p{color:oklch(1 0 0 / 0.75);font-size:1.05rem;max-width:520px;line-height:1.7}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:var(--radius);
  font-size:0.9rem;font-weight:600;font-family:inherit;
  cursor:pointer;border:none;text-decoration:none;
  transition:all 0.2s;
}
.btn-primary{
  background:linear-gradient(135deg,var(--brand-glow),var(--brand));
  color:#fff;box-shadow:0 4px 16px oklch(0.55 0.20 250 / 0.3);
}
.btn-primary:hover{box-shadow:0 6px 24px oklch(0.55 0.20 250 / 0.45);transform:translateY(-1px);color:#fff}
.btn-glass{
  background:var(--glass-bg);color:var(--ink-inverse);
  border:1px solid var(--glass-border);
  backdrop-filter:blur(8px);
}
.btn-glass:hover{background:oklch(1 0 0 / 0.14);color:var(--ink-inverse)}
.btn-lg{padding:16px 36px;font-size:1rem}

/* ---- Section ---- */
.section{padding:72px 0}
.section-alt{background:var(--bg-alt);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-heading{font-size:1.5rem;font-weight:700;letter-spacing:-0.02em;margin-bottom:10px}
.section-sub{font-size:0.95rem;color:var(--ink-secondary);margin-bottom:40px;line-height:1.6}

/* ---- Feature highlights (3-col, card-less, icon-led) ---- */
.highlight-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:36px;
}
.highlight-item{
  padding:24px 0;border-top:3px solid var(--brand);
}
.highlight-item:nth-child(2){border-top-color:var(--brand-glow)}
.highlight-item:nth-child(3){border-top-color:var(--brand-deep)}
.highlight-item .hl-icon{font-size:1.5rem;margin-bottom:12px;display:block}
.highlight-item h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.highlight-item p{font-size:0.875rem;color:var(--ink-secondary);line-height:1.6}

/* ---- Dense capability list ---- */
.cap-list{
  display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px;
}
.cap-row{
  display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--border-light);
  align-items:flex-start;
}
.cap-row:last-child,.cap-row:nth-last-child(2){border-bottom:none}
.cap-row-icon{font-size:1.2rem;flex-shrink:0;margin-top:2px;width:28px;text-align:center}
.cap-row h4{font-size:0.9rem;font-weight:600;margin-bottom:2px}
.cap-row p{font-size:0.82rem;color:var(--ink-secondary);line-height:1.55}

/* ---- Stats bar ---- */
.stats-bar{
  display:flex;gap:32px;justify-content:center;padding:28px 0;
  border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light);
  margin-top:48px;
}
.stat-item{text-align:center}
.stat-num{font-size:1.75rem;font-weight:800;color:var(--brand);line-height:1.2}
.stat-label{font-size:0.8rem;color:var(--ink-muted);margin-top:4px}

/* ---- Glass cards (subtle, functional for data) ---- */
.glass-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.glass-card{
  padding:24px;border-radius:var(--radius);
  background:oklch(1 0 0 / 0.6);backdrop-filter:blur(8px);
  border:1px solid var(--border);
}
.glass-card h3{font-size:0.95rem;font-weight:700;margin-bottom:8px}
.glass-card p{font-size:0.84rem;color:var(--ink-secondary);line-height:1.6}

/* ---- FAQ ---- */
.faq-compact{max-width:720px;margin:0 auto}
.faq-compact details{border-bottom:1px solid var(--border-light);padding:4px 0}
.faq-compact summary{
  font-weight:600;font-size:0.9rem;padding:14px 0;cursor:pointer;color:var(--ink);
  list-style:none;display:flex;justify-content:space-between;align-items:center;
}
.faq-compact summary:hover{color:var(--brand)}
.faq-compact summary::after{content:"+";font-size:1.2rem;color:var(--ink-muted);font-weight:300}
.faq-compact details[open] summary::after{content:"-"}
.faq-compact details p{padding:0 0 14px;color:var(--ink-secondary);font-size:0.85rem;line-height:1.7}

/* ---- Tables (dense, tech-style) ---- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:24px}
.tbl-wrap table{width:100%;border-collapse:collapse;font-size:0.85rem}
.tbl-wrap th{
  text-align:left;padding:10px 14px;font-weight:600;font-size:0.75rem;
  color:var(--ink-muted);text-transform:uppercase;letter-spacing:0.06em;
  border-bottom:2px solid var(--border);background:var(--bg-alt);
}
.tbl-wrap td{padding:10px 14px;border-bottom:1px solid var(--border-light);color:var(--ink-secondary)}
.tbl-wrap td:first-child{font-weight:500;color:var(--ink)}
.tbl-wrap tr:hover td{background:var(--brand-light)}
.tbl-wrap .yes{color:var(--green);font-weight:600;font-size:0.82rem}
.tbl-wrap .no{color:var(--ink-muted);font-size:0.82rem}
.tbl-wrap code{font-family:var(--mono);font-size:0.78rem;background:var(--bg-alt);padding:1px 6px;border-radius:3px;color:var(--brand-hover)}
.tbl-wrap .price{font-weight:700;color:var(--brand);font-size:0.95rem}

/* ---- Download: compact rows ---- */
.dl-tabs{display:flex;gap:0;margin-bottom:32px;overflow-x:auto}
.dl-tab{
  padding:10px 22px;font-size:0.85rem;font-weight:500;
  color:var(--ink-secondary);cursor:pointer;border:none;
  background:none;font-family:inherit;border-bottom:2px solid transparent;
  transition:color 0.15s,border-color 0.15s;white-space:nowrap;
}
.dl-tab:hover{color:var(--ink)}
.dl-tab.active{color:var(--brand);border-bottom-color:var(--brand)}
.dl-group{margin-bottom:36px}
.dl-group h3{font-size:1rem;font-weight:700;margin-bottom:12px}
.dl-row{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 18px;margin-bottom:6px;border-radius:var(--radius-sm);
  border:1.5px solid var(--border);background:var(--bg);
  transition:border-color 0.15s,background 0.15s;gap:16px;
}
.dl-row:hover{border-color:var(--brand);background:var(--brand-light)}
.dl-row--primary{border-color:var(--brand)}
.dl-row-info h4{font-size:0.88rem;font-weight:600;margin-bottom:1px}
.dl-row-info span{font-size:0.78rem;color:var(--ink-muted)}
.dl-tag{display:inline-block;padding:1px 8px;border-radius:3px;font-size:0.7rem;font-weight:600;margin-left:8px;background:var(--brand);color:#fff}
.dl-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 18px;border-radius:var(--radius-sm);
  font-size:0.82rem;font-weight:600;font-family:inherit;
  cursor:pointer;border:none;
  background:linear-gradient(135deg,var(--brand-glow),var(--brand));
  color:#fff;text-decoration:none;white-space:nowrap;
  transition:all 0.2s;
}
.dl-btn:hover{box-shadow:0 2px 12px oklch(0.55 0.20 250 / 0.3);color:#fff;transform:translateY(-1px)}

/* ---- Info box ---- */
.info-box{
  padding:18px 22px;margin-bottom:18px;
  border-left:3px solid var(--brand);
  background:var(--brand-light);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-size:0.88rem;color:var(--ink-secondary);line-height:1.7;
}

/* ---- Reqs ---- */
.req-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}
.req-item{
  padding:16px;border-radius:var(--radius-sm);
  background:var(--bg);border:1px solid var(--border);
}
.req-item h4{font-size:0.84rem;font-weight:700;margin-bottom:8px;color:var(--brand)}
.req-item dl{font-size:0.8rem}
.req-item dt{color:var(--ink-muted);display:inline}
.req-item dd{color:var(--ink-secondary);display:inline;margin-left:4px}
.req-item .req-row{display:flex;justify-content:space-between;padding:2px 0}

/* ---- 404 ---- */
.error-page{text-align:center;padding:120px 0}
.error-code{font-size:6rem;font-weight:800;color:var(--brand);line-height:1.2;margin-bottom:8px}

/* ---- Footer ---- */
.footer{
  padding:40px 0;border-top:1px solid var(--border);
  font-size:0.82rem;color:var(--ink-muted);background:var(--bg-alt);
}
.footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px}
.footer a{color:var(--ink-muted)}
.footer a:hover{color:var(--brand)}

/* ---- Responsive ---- */
@media(max-width:768px){
  .hero{padding:72px 0 56px}
  .hero h1{font-size:1.75rem}
  .highlight-grid,.glass-grid{grid-template-columns:1fr;gap:24px}
  .cap-list{grid-template-columns:1fr}
  .cap-row:last-child,.cap-row:nth-last-child(2){border-bottom:1px solid var(--border-light)}
  .stats-bar{flex-wrap:wrap;gap:20px}
  .dl-row{flex-wrap:wrap}
  .section{padding:48px 0}
  .navbar .wrap{flex-wrap:wrap;height:auto;padding:10px 28px 6px;gap:8px}
  .nav-links{gap:18px;overflow-x:auto;padding-bottom:4px}
}