/* ============================================================
   dshbase — DeepSeek-style light design system
   浅色现代风：白底 / 深蓝黑文字 / DeepSeek 蓝紫渐变 / 卡片式
   与 noatmark 的深色玻璃拟态完全区分
   ============================================================ */
:root {
  --bg: #F6F8FC;
  --bg-soft: #EEF2F9;
  --bg-card: #FFFFFF;
  --ink: #0F172A;
  --ink-2: #475569;
  --muted: #94A3B8;
  --primary: #4D6BFE;
  --primary-600: #3B5BDB;
  --primary-soft: #EEF2FF;
  --purple: #7A5CFF;
  --grad: linear-gradient(135deg, #4D6BFE 0%, #7A5CFF 100%);
  --grad-text: linear-gradient(120deg, #4D6BFE, #7A5CFF);
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --amber: #D97706;
  --amber-soft: #FEF3C7;
  --red: #DC2626;
  --red-soft: #FEE2E2;
  --green: #059669;
  --green-soft: #D1FAE5;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.12), 0 2px 6px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 24px 60px -20px rgba(77, 107, 254, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --font: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Outfit", "Inter", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1000px 480px at 12% -6%, rgba(77, 107, 254, 0.08), transparent 60%),
    radial-gradient(900px 500px at 92% 4%, rgba(122, 92, 255, 0.07), transparent 60%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 26px; }
a { color: var(--primary-600); text-decoration: none; }
a:hover { color: var(--primary); }
h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.02em; line-height: 1.18; }
code { font-family: var(--mono); }

/* ---------- nav ---------- */
.top {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.top-in { display: flex; align-items: center; gap: 18px; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
.brand {
  font-size: 19px; font-weight: 800; color: var(--ink);
  text-decoration: none; display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-display); letter-spacing: -0.01em;
}
.brand-logo { width: 30px; height: 30px; display: inline-block; flex: none; border-radius: 8px; box-shadow: var(--shadow-sm); }
.brand strong { color: var(--primary); }
.nav { display: flex; gap: 2px; flex-wrap: wrap; margin-left: auto; }
.nav a {
  color: var(--ink-2); font-size: 13.5px; font-weight: 500;
  padding: 7px 13px; border-radius: 8px;
}
.nav a:hover { color: var(--ink); background: var(--bg-soft); }
.nav a[aria-current] { color: var(--primary-600); background: var(--primary-soft); font-weight: 600; }
.nav-cta { margin-left: 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--border-strong);
  background: #fff; color: var(--ink);
  padding: 9px 18px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; font-family: var(--font);
  cursor: pointer; text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s, background .15s, transform .05s, box-shadow .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary-600); background: #fff; box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--grad); border-color: transparent; color: #fff;
  box-shadow: 0 8px 22px -8px rgba(77, 107, 254, 0.5);
}
.btn-primary:hover { background: var(--grad); color: #fff; filter: brightness(1.06); box-shadow: 0 12px 28px -8px rgba(77, 107, 254, 0.55); }
.btn-ghost { background: transparent; box-shadow: none; }
.btn-sm { padding: 6px 13px; font-size: 13px; }
.btn-lg { padding: 13px 24px; font-size: 15px; border-radius: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- hero ---------- */
.hero { padding: 72px 22px 52px; text-align: center; }
.hero h1 {
  font-size: clamp(34px, 5.6vw, 58px);
  margin: 0 0 18px; color: var(--ink); font-weight: 800;
}
.hero h1 .accent {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.lede { font-size: 17.5px; color: var(--ink-2); max-width: 640px; margin: 0 auto 16px; font-weight: 400; }
.lede-sub { color: var(--ink-2); font-size: 15px; max-width: 580px; margin: 0 0 18px; }
.eyebrow {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--primary-600);
  border: 1px solid #CBD5F1; border-radius: 999px;
  padding: 4px 13px; margin-bottom: 16px; background: var(--primary-soft);
}
.badge-row { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; color: var(--ink-2); font-weight: 500;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 5px 13px; background: #fff;
}
.badge b { color: var(--primary-600); font-weight: 700; }
.browsers { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 22px; }

/* ---------- content sections ---------- */
.info, .how, .faq, .learn { padding: 42px 22px; }
.info h2, .how h2, .faq h2, .learn h2 { font-size: 26px; margin: 0 0 12px; color: var(--ink); font-weight: 800; }
.info > p { color: var(--ink-2); }
h2 .anchor { color: var(--primary); font-size: 18px; }

.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 20px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin-top: 20px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .18s, transform .1s, border-color .18s;
}
.card h3 { margin: 0 0 8px; font-size: 15.5px; color: var(--ink); }
.card p { margin: 0; color: var(--ink-2); font-size: 14px; }
.card code { font-size: 12.5px; background: var(--primary-soft); padding: 1px 6px; border-radius: 5px; color: var(--primary-600); }
.card-accent {
  border-color: #C7D2FE;
  background: linear-gradient(160deg, #FFFFFF, #EEF2FF);
  box-shadow: 0 4px 18px -6px rgba(77, 107, 254, 0.18);
}
.card-link { display: block; text-decoration: none; color: inherit; }
.card-link:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.card-link h3 { color: var(--ink); }
.card-link:hover h3 { color: var(--primary); }
.card-link p { color: var(--ink-2); }
.card-link .arr { color: var(--primary); font-weight: 700; }
.cat {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--primary-600);
  background: var(--primary-soft); border: 1px solid #CBD5F1;
  border-radius: 999px; padding: 3px 10px; margin-bottom: 10px;
}

/* ---------- steps ---------- */
.steps-sec { padding: 36px 22px; text-align: center; }
.steps-sec h2 { font-size: 26px; margin: 0 0 20px; color: var(--ink); font-weight: 800; }
.step-card { text-align: left; }
.step-n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 9px;
  font-family: var(--font-display); font-weight: 800; font-size: 15px;
  background: var(--grad); color: #fff;
  margin-bottom: 12px; box-shadow: 0 4px 12px -4px rgba(77,107,254,0.5);
}
.steps { padding-left: 20px; color: var(--ink-2); }
.steps li { margin-bottom: 9px; }
.steps strong { color: var(--ink); }

/* ---------- code block ---------- */
.code-block {
  background: #0F172A; border: 1px solid #1E293B; border-radius: var(--radius-sm);
  padding: 14px 16px; font-family: var(--mono); font-size: 12.5px;
  overflow-x: auto; color: #E2E8F0; line-height: 1.7; margin: 12px 0;
}

/* ---------- table ---------- */
.ztable {
  border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 13.5px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.ztable th, .ztable td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); }
.ztable th { background: var(--bg-soft); color: var(--ink); font-weight: 700; }
.ztable code { font-size: 12px; background: var(--primary-soft); padding: 1px 6px; border-radius: 4px; color: var(--primary-600); }

/* ---------- FAQ ---------- */
.faq details { border-bottom: 1px solid var(--border); padding: 15px 2px; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ink); font-family: var(--font-display); }
.faq summary::marker { color: var(--primary); }
.faq details p { color: var(--ink-2); margin: 9px 0 0; }
.faq details code { font-size: 12.5px; background: var(--primary-soft); padding: 1px 5px; border-radius: 4px; color: var(--primary-600); }

/* ---------- images ---------- */
article img, .info img {
  max-width: 100%; border-radius: var(--radius-sm);
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--border); background: #fff; }
.foot-grid {
  max-width: 1160px; margin: 0 auto; padding: 34px 22px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px;
}
.foot-col { display: flex; flex-direction: column; gap: 8px; }
.foot-col b { color: var(--ink); font-size: 13px; margin-bottom: 5px; text-transform: uppercase; letter-spacing: .05em; }
.foot-col a { color: var(--ink-2); font-size: 13.5px; }
.foot-col a:hover { color: var(--primary); }
.foot-brand { font-family: var(--font-display); font-weight: 800; font-size: 18px; margin: 0 0 8px; display: flex; align-items: center; gap: 9px; color: var(--ink); }
.foot-brand strong { color: var(--primary); }
.foot-logo { width: 24px; height: 24px; flex: none; border-radius: 6px; }
.foot-in { padding: 0 22px 26px; text-align: center; }

/* ---------- status / misc ---------- */
.muted { color: var(--muted); }
.muted.small { font-size: 13px; }
.hidden { display: none; }
.dim { color: var(--muted); }
.pos { color: var(--green); }
.bad { color: var(--red); }
.warn { color: var(--amber); }
blockquote.code-block { border-left: 4px solid var(--primary); padding-left: 16px; color: #E2E8F0; }

/* ---------- lang switch floating button ---------- */
.lang-switch {
  position: fixed; right: 22px; top: 72px; z-index: 60;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 999px;
  background: #fff; border: 1px solid var(--border-strong);
  box-shadow: var(--shadow); font-weight: 700; font-size: 14px;
  color: var(--ink); text-decoration: none;
  transition: border-color .15s, color .15s, box-shadow .15s, transform .1s;
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.lang-switch-ico { font-size: 15px; }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .hero { padding-top: 48px; }
  .nav { order: 3; width: 100%; margin-left: 0; }
  .nav-cta { margin-left: auto; }
}