/* ============================================
   DeepSeek Theme 2 - 天空蓝白 | 大幅留白
   与主题1截然不同：明亮、松弛、现代
   ============================================ */

:root {
  --brand:        oklch(0.60 0.17 240);
  --brand-hover:  oklch(0.52 0.16 240);
  --brand-light:  oklch(0.95 0.03 240);
  --brand-surface: oklch(0.97 0.015 240);

  --bg:           oklch(1 0 0);
  --bg-alt:       oklch(0.975 0.008 240);

  --ink:          oklch(0.14 0.01 260);
  --ink-secondary: oklch(0.44 0.01 260);
  --ink-muted:    oklch(0.62 0.01 260);

  --border:       oklch(0.90 0.005 250);
  --border-light: oklch(0.94 0.003 250);

  --green: oklch(0.58 0.16 155);

  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --mono: "SF Mono","Cascadia Code","Consolas",monospace;
  --w: 960px;
  --radius: 12px;
}

*,*::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:1rem;line-height:1.7;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none;transition:color 0.2s}
a:hover{color:var(--brand-hover)}
::selection{background:var(--brand-light);color:var(--ink)}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.wrap{max-width:var(--w);margin:0 auto;padding:0 32px}

/* ---- Nav: light, spacious ---- */
.navbar{
  position:sticky;top:0;z-index:100;
  background:oklch(1 0 0 / 0.9);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.navbar .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.15rem;font-weight:700;color:var(--ink);letter-spacing:-0.01em}
.nav-logo svg{width:30px;height:30px;flex-shrink:0}
.nav-links{display:flex;gap:36px}
.nav-links a{font-size:0.9rem;font-weight:500;color:var(--ink-secondary);padding:6px 0;position:relative}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--brand);transition:width 0.2s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-links a:hover,.nav-links a.active{color:var(--brand)}

/* ---- Hero: big, airy ---- */
.hero{padding:120px 0 80px;text-align:center}
.hero h1{font-size:3rem;font-weight:800;letter-spacing:-0.04em;line-height:1.15;margin-bottom:20px}
.hero p{font-size:1.15rem;color:var(--ink-secondary);max-width:500px;margin:0 auto;line-height:1.8}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 32px;border-radius:var(--radius);
  font-size:0.95rem;font-weight:600;font-family:inherit;
  cursor:pointer;border:none;text-decoration:none;
  transition:all 0.2s;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 2px 12px oklch(0.60 0.17 240 / 0.25)}
.btn-primary:hover{background:var(--brand-hover);color:#fff;box-shadow:0 4px 20px oklch(0.60 0.17 240 / 0.35);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--ink-secondary);border:2px solid var(--border)}
.btn-outline:hover{color:var(--brand);border-color:var(--brand)}
.btn-lg{padding:18px 40px;font-size:1.05rem}

/* ---- Sections: lots of breathing room ---- */
.section{padding:100px 0}
.section-alt{background:var(--bg-alt);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-label{font-size:0.85rem;font-weight:600;color:var(--brand);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:12px;text-align:center}
.section-heading{font-size:2rem;font-weight:700;letter-spacing:-0.02em;margin-bottom:16px;text-align:center}
.section-sub{font-size:1.05rem;color:var(--ink-secondary);text-align:center;max-width:520px;margin:0 auto 56px;line-height:1.7}

/* ---- Features: relaxed 3-col ---- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:56px}
.feature-item{text-align:center}
.feature-item .fi-icon{font-size:2.5rem;margin-bottom:16px;display:block}
.feature-item h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.feature-item p{font-size:0.9rem;color:var(--ink-secondary);line-height:1.7;max-width:28ch;margin:0 auto}

/* ---- Capabilities: 2-col airy ---- */
.cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 64px}
.cap-item{padding:28px 0;border-bottom:1px solid var(--border-light)}
.cap-item:last-child,.cap-item:nth-last-child(2){border-bottom:none}
.cap-item h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.cap-item p{font-size:0.9rem;color:var(--ink-secondary);line-height:1.7}

/* ---- FAQ: generous spacing ---- */
.faq-list{max-width:680px;margin:0 auto}
.faq-list details{border-bottom:1px solid var(--border-light);padding:8px 0}
.faq-list summary{font-weight:600;font-size:0.95rem;padding:20px 0;cursor:pointer;color:var(--ink);list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-list summary:hover{color:var(--brand)}
.faq-list summary::after{content:'+';font-size:1.3rem;color:var(--ink-muted);font-weight:300}
.faq-list details[open] summary::after{content:'\2212'}
.faq-list details p{padding:0 0 20px;color:var(--ink-secondary);font-size:0.9rem;line-height:1.8}

/* ---- Tables: clean, open ---- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:28px}
.tbl-wrap table{width:100%;border-collapse:collapse;font-size:0.9rem}
.tbl-wrap th{text-align:left;padding:14px 18px;font-weight:600;font-size:0.8rem;color:var(--ink-muted);letter-spacing:0.05em;border-bottom:2px solid var(--border);background:var(--bg-alt)}
.tbl-wrap td{padding:14px 18px;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}
.tbl-wrap .no{color:var(--ink-muted)}
.tbl-wrap code{font-family:var(--mono);font-size:0.82rem;background:var(--bg-alt);padding:2px 8px;border-radius:4px;color:var(--brand-hover)}

/* ---- Download: clean rows ---- */
.dl-tabs-wrapper{border-bottom:1px solid var(--border);margin-bottom:40px}
.dl-tabs{display:flex;gap:0}
.dl-tab{padding:14px 28px;font-size:0.9rem;font-weight:500;color:var(--ink-secondary);cursor:pointer;border:none;background:none;font-family:inherit;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all 0.2s}
.dl-tab:hover{color:var(--ink)}
.dl-tab.active{color:var(--brand);border-bottom-color:var(--brand);font-weight:600}

.dl-group{margin-bottom:48px}
.dl-group h3{font-size:1.05rem;font-weight:700;margin-bottom:16px}
.dl-row{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;margin-bottom:10px;border-radius:var(--radius);border:2px solid var(--border);background:var(--bg);transition:border-color 0.2s;gap:20px}
.dl-row:hover{border-color:var(--brand)}
.dl-row--primary{border-color:var(--brand);background:var(--brand-light)}
.dl-row-info h4{font-size:0.95rem;font-weight:600;margin-bottom:3px}
.dl-row-info span{font-size:0.82rem;color:var(--ink-muted)}
.dl-tag{display:inline-block;padding:2px 10px;border-radius:4px;font-size:0.75rem;font-weight:600;margin-left:10px;background:var(--brand);color:#fff}
.dl-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:var(--radius);font-size:0.88rem;font-weight:600;cursor:pointer;border:none;background:var(--brand);color:#fff;text-decoration:none;white-space:nowrap;transition:all 0.2s}
.dl-btn:hover{background:var(--brand-hover);color:#fff;box-shadow:0 2px 12px oklch(0.60 0.17 240 / 0.2)}

/* ---- Pricing ---- */
.price-val{font-weight:700;font-size:1rem;color:var(--brand)}
.info-callout{padding:20px 24px;margin-bottom:20px;border-left:3px solid var(--brand);background:var(--brand-light);border-radius:0 var(--radius) var(--radius) 0;font-size:0.9rem;color:var(--ink-secondary);line-height:1.8}
.note-warning{padding:16px 20px;border-radius:var(--radius);background:oklch(0.97 0.02 95);color:oklch(0.48 0.08 85);font-size:0.84rem;line-height:1.7}

/* ---- System reqs ---- */
.req-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px}
.req-item{padding:20px;border-radius:var(--radius);background:var(--bg);border:1px solid var(--border)}
.req-item h4{font-size:0.9rem;font-weight:700;margin-bottom:10px;color:var(--brand)}
.req-item dl{font-size:0.84rem}
.req-item dt{color:var(--ink-muted)}
.req-item dd{color:var(--ink-secondary);margin-bottom:3px}

/* ---- 404 ---- */
.error-page{text-align:center;padding:140px 0}
.error-code{font-size:7rem;font-weight:800;color:var(--brand);line-height:1;margin-bottom:12px;opacity:0.85}

/* ---- Footer ---- */
.footer{padding:48px 0;border-top:1px solid var(--border);font-size:0.84rem;color:var(--ink-muted);background:var(--bg)}
.footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px}
.footer a{color:var(--ink-muted)}
.footer a:hover{color:var(--brand)}

/* ---- Responsive ---- */
@media(max-width:768px){
  .hero{padding:80px 0 64px}
  .hero h1{font-size:2rem}
  .section{padding:64px 0}
  .section-heading{font-size:1.5rem}
  .feature-grid,.cap-grid{grid-template-columns:1fr;gap:32px}
  .cap-item:nth-last-child(2){border-bottom:1px solid var(--border-light)}
  .dl-row{flex-wrap:wrap}
  .navbar .wrap{flex-wrap:wrap;height:auto;padding:10px 32px 6px;gap:8px}
  .nav-links{gap:20px;overflow-x:auto;padding-bottom:4px}
}