/* ==========================================================================
   SENSEWARD — 视觉系统 v1
   工作流 A · 方向三 Landscape × Signal × Human
   Preserve the knowledge. Reframe the product.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{/* 晨雾基底；auto 默认跟随系统 */
  --sw-bg:#F4F1E9;--sw-bg-2:#FBFAF6;--sw-ink:#182127;--sw-muted:#667078;--sw-line:rgba(24,33,39,.14);--sw-orange:#E6521D;--sw-orange-soft:rgba(230,82,29,.10);--sw-signal:#247B52;--sw-grid:rgba(24,33,39,.09);--sw-font-display:"Fraunces","Newsreader",Georgia,"Songti SC",serif;--sw-font-body:"Inter","Noto Sans SC",-apple-system,"PingFang SC",sans-serif;--sw-font-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;--sw-radius:6px;--sw-radius-lg:12px;--sw-max:1180px;}

@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --sw-bg:#0B0E12;--sw-bg-2:#12161C;--sw-ink:#F3F1EC;--sw-muted:#9AA1AC;--sw-line:rgba(243,241,236,.12);--sw-orange:#FF5A1F;--sw-orange-soft:rgba(255,90,31,.14);--sw-signal:#8FE3B0;--sw-grid:rgba(180,190,200,.14);
  }
}
:root[data-theme="dark"]{
  --sw-bg:#0B0E12;--sw-bg-2:#12161C;--sw-ink:#F3F1EC;--sw-muted:#9AA1AC;--sw-line:rgba(243,241,236,.12);--sw-orange:#FF5A1F;--sw-orange-soft:rgba(255,90,31,.14);--sw-signal:#8FE3B0;--sw-grid:rgba(180,190,200,.14);
}
:root[data-theme="light"]{
  --sw-bg:#F7F6F3;
  --sw-bg-2:#FFFFFF;
  --sw-ink:#1C1E22;
  --sw-muted:#666D77;
  --sw-line:rgba(28,30,34,.12);
  --sw-orange:#E24E17;
  --sw-orange-soft:rgba(226,78,23,.10);
  --sw-signal:#1F9A5A;
  --sw-grid:rgba(28,30,34,.08);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body.sw{
  background:var(--sw-bg);
  color:var(--sw-ink);
  font-family:var(--sw-font-body);
  -webkit-font-smoothing:antialiased;
  margin:0;
}

.sw-container{max-width:var(--sw-max);margin:0 auto;padding:0 24px}
@media (max-width:640px){.sw-container{padding:0 18px}}

.sw-section{padding:88px 0}
@media (max-width:720px){.sw-section{padding:56px 0}}

.sw-eyebrow{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--sw-font-mono);
  font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--sw-orange);
  margin:0 0 14px;
}

.sw-coord{
  font-family:var(--sw-font-mono);
  font-size:.68rem;letter-spacing:.04em;
  color:var(--sw-muted);
  opacity:.7;
}

h1.sw-h1,h2.sw-h2,h3.sw-h3{
  font-family:var(--sw-font-display);
  font-weight:500;
  letter-spacing:-.01em;
  margin:0;
  color:var(--sw-ink);
}
h1.sw-h1{font-size:clamp(2.6rem,6vw,4.6rem);line-height:1.04;font-weight:400}
h2.sw-h2{font-size:clamp(1.7rem,3.2vw,2.4rem);line-height:1.15}
h3.sw-h3{font-size:1.2rem;line-height:1.3}

.sw-lead{font-size:1.15rem;color:var(--sw-muted);line-height:1.6;max-width:56ch}
.sw-sub{font-size:.98rem;color:var(--sw-muted);line-height:1.6}

/* 按钮 */
.sw-btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--sw-font-body);font-weight:600;font-size:.92rem;
  padding:13px 22px;border-radius:999px;
  text-decoration:none;cursor:pointer;border:1px solid transparent;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease,border-color .15s ease;
}
.sw-btn:active{transform:scale(.98)}
.sw-btn-primary{
  background:var(--sw-orange);color:#12161C;
}
.sw-btn-primary:hover{box-shadow:0 8px 24px rgba(255,90,31,.28)}
.sw-btn-ghost{
  background:transparent;color:var(--sw-ink);border-color:var(--sw-line);
}
.sw-btn-ghost:hover{border-color:var(--sw-ink)}

/* 卡片 */
.sw-card{
  background:var(--sw-bg-2);
  border:1px solid var(--sw-line);
  border-radius:var(--sw-radius-lg);
  padding:22px 24px;
}

.sw-tag{
  display:inline-flex;align-items:center;gap:5px;
  font-family:var(--sw-font-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;
  padding:3px 9px;border-radius:999px;border:1px solid var(--sw-line);
  color:var(--sw-muted);
}
.sw-tag-signal{color:var(--sw-signal);border-color:color-mix(in srgb, var(--sw-signal) 40%, transparent);background:color-mix(in srgb, var(--sw-signal) 10%, transparent)}
.sw-tag-noise{color:var(--sw-muted)}

.sw-link{color:var(--sw-orange);text-decoration:none;font-weight:600}
.sw-link:hover{text-decoration:underline}

/* ==== 顶部导航（由 sw-nav.js 注入） ==== */
.sw-nav{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb, var(--sw-bg) 82%, transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--sw-line);
}
.sw-nav-inner{
  max-width:var(--sw-max);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.sw-word{
  font-family:var(--sw-font-display);font-weight:600;font-size:1.05rem;
  letter-spacing:.02em;color:var(--sw-ink);text-decoration:none;
  display:flex;align-items:center;gap:7px;white-space:nowrap;
}
.sw-word .dot{color:var(--sw-orange);font-size:.7em}
.sw-links{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.sw-links a{
  font-size:.86rem;color:var(--sw-muted);text-decoration:none;font-weight:500;
  transition:color .15s;
  display:flex;align-items:baseline;gap:5px;
}
.sw-en{font-size:.62em;letter-spacing:.08em;opacity:.55;text-transform:uppercase}
.sw-links a:hover{color:var(--sw-ink)}
.sw-links a.on{color:var(--sw-ink)}
.sw-links a.on::after{content:"";display:block;height:2px;background:var(--sw-orange);margin-top:6px;border-radius:2px}
.sw-nav-right{display:flex;align-items:center;gap:14px;flex-shrink:0}
.sw-map-link{
  font-family:var(--sw-font-mono);font-size:.72rem;letter-spacing:.06em;
  color:var(--sw-muted);text-decoration:none;border:1px solid var(--sw-line);
  padding:6px 11px;border-radius:999px;
  display:flex;align-items:baseline;gap:5px;
}
.sw-map-link:hover{color:var(--sw-ink);border-color:var(--sw-ink)}
.sw-lang{display:flex;gap:2px;font-family:var(--sw-font-mono);font-size:.72rem}
.sw-lang a{color:var(--sw-muted);text-decoration:none;padding:4px 6px}
.sw-lang a.on{color:var(--sw-orange);font-weight:700}
.sw-theme{background:none;border:1px solid var(--sw-line);color:var(--sw-muted);border-radius:999px;padding:6px 10px;font:500 .72rem var(--sw-font-body);cursor:pointer;white-space:nowrap}
.sw-theme:hover{color:var(--sw-ink);border-color:var(--sw-ink)}
.sw-burger{display:none;background:none;border:none;color:var(--sw-ink);font-size:1.3rem;cursor:pointer;padding:4px 6px}

@media (max-width:860px){
  .sw-links{display:none}
  .sw-burger{display:inline-flex}
  .sw-nav-inner{flex-wrap:wrap}
  .sw-links.sw-open{
    display:flex;flex-direction:column;align-items:flex-start;gap:2px;
    width:100%;order:3;padding-top:10px;border-top:1px solid var(--sw-line);margin-top:10px;
  }
  .sw-links.sw-open a{width:100%;padding:9px 2px}
}

/* ==== 页脚 ==== */
.sw-foot{
  border-top:1px solid var(--sw-line);
  padding:34px 0 48px;
}
.sw-foot-inner{
  max-width:var(--sw-max);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.sw-foot-brand{display:flex;align-items:center;gap:8px;font-size:.82rem;color:var(--sw-muted)}
.sw-foot-brand .fire{color:var(--sw-orange)}
.sw-foot-tag{font-size:.8rem;color:var(--sw-muted);text-align:right}

/* 工具类 */
.sw-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.sw-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.sw-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media (max-width:900px){.sw-grid-3{grid-template-columns:1fr 1fr}.sw-grid-4{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.sw-grid-2,.sw-grid-3,.sw-grid-4{grid-template-columns:1fr}}