:root{
  --primary:#7C5CFF;
  --primary2:#22D3EE;
  --primary-rgb:124,92,255;
  --primary2-rgb:34,211,238;
  --on-primary:#071018;

  --bg0:#F7F8FF;
  --bg1:#EAF1FF;
  --panel:rgba(255,255,255,.80);
  --panel2:rgba(255,255,255,.62);
  --border:rgba(15,23,42,.10);
  --text:rgba(15,23,42,.92);
  --muted:rgba(15,23,42,.72);
  --faint:rgba(15,23,42,.54);
  --codebg:rgba(2,6,23,.09);
  --chipbg:rgba(255,255,255,.58);
  --navbg:rgba(248,250,255,.66);
  --glow1:rgba(124,92,255,.18);
  --glow2:rgba(34,211,238,.14);
  --glow3:rgba(52,211,153,.10);
  --sheen:rgba(255,255,255,.48);
  --shadow:0 24px 70px rgba(15,23,42,.14);
  --shadow-soft:0 14px 36px rgba(15,23,42,.10);

  --content-max:1120px;
  --list-max:1040px;
  --reading-max:920px;
  --radius-sm:14px;
  --radius-md:18px;
  --radius-lg:28px;
}

html[data-theme="dark"]{
  --bg0:#070A12;
  --bg1:#0A1022;
  --panel:rgba(255,255,255,.08);
  --panel2:rgba(255,255,255,.05);
  --border:rgba(255,255,255,.12);
  --text:rgba(255,255,255,.92);
  --muted:rgba(255,255,255,.70);
  --faint:rgba(255,255,255,.50);
  --codebg:rgba(0,0,0,.32);
  --chipbg:rgba(255,255,255,.06);
  --navbg:rgba(7,10,18,.62);
  --shadow:0 28px 84px rgba(0,0,0,.44);
  --shadow-soft:0 16px 42px rgba(0,0,0,.28);
  --glow1:rgba(124,92,255,.44);
  --glow2:rgba(34,211,238,.28);
  --glow3:rgba(52,211,153,.18);
  --sheen:rgba(255,255,255,.06);
}

@media (prefers-color-scheme: dark){
  html:not([data-theme]),
  html[data-theme="system"]{
    --bg0:#070A12;
    --bg1:#0A1022;
    --panel:rgba(255,255,255,.08);
    --panel2:rgba(255,255,255,.05);
    --border:rgba(255,255,255,.12);
    --text:rgba(255,255,255,.92);
    --muted:rgba(255,255,255,.70);
    --faint:rgba(255,255,255,.50);
    --codebg:rgba(0,0,0,.32);
    --chipbg:rgba(255,255,255,.06);
    --navbg:rgba(7,10,18,.62);
    --shadow:0 28px 84px rgba(0,0,0,.44);
    --shadow-soft:0 16px 42px rgba(0,0,0,.28);
    --glow1:rgba(124,92,255,.44);
    --glow2:rgba(34,211,238,.28);
    --glow3:rgba(52,211,153,.18);
    --sheen:rgba(255,255,255,.06);
  }
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
}

body{
  margin:0;
  font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,"Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:
    radial-gradient(1100px 700px at 0% -10%, var(--glow1), transparent 62%),
    radial-gradient(900px 560px at 100% 8%, var(--glow2), transparent 58%),
    radial-gradient(860px 560px at 52% 100%, var(--glow3), transparent 62%),
    linear-gradient(180deg, var(--sheen), rgba(255,255,255,0) 24%),
    linear-gradient(180deg,var(--bg0),var(--bg1));
  overflow-x:hidden;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
main{display:block}

.wrap{
  max-width:var(--page-max, var(--content-max));
  margin:0 auto;
  padding:36px 24px 0;
}

.wrap > h1:first-child{
  margin:0 0 10px;
  font-size:clamp(34px, 5vw, 50px);
  line-height:1.04;
  letter-spacing:-.045em;
}

.lead,
.muted,
.sub,
.tips{
  margin:0;
  color:var(--muted);
  line-height:1.8;
}

.lead{max-width:72ch}
.meta{margin-top:18px;font-size:13px;color:var(--faint)}

.card{
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  background:linear-gradient(180deg, var(--panel), var(--panel2));
  box-shadow:var(--shadow-soft);
}

.card h2{
  margin:0 0 10px;
  font-size:20px;
  line-height:1.24;
}

.card p{
  margin:0;
  color:var(--muted);
  line-height:1.78;
}

.card p + p{margin-top:12px}

section.card{
  margin-top:16px;
  padding:18px;
}

.card ul{
  margin:0;
  padding-left:18px;
  display:grid;
  gap:8px;
  color:var(--muted);
}

ul{
  color:var(--muted);
  line-height:1.72;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:42px;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  background:var(--panel2);
  color:var(--text);
  box-shadow:0 10px 26px rgba(15,23,42,.08);
  cursor:pointer;
  user-select:none;
  transition:transform .16s ease, background .16s ease, border-color .16s ease, color .16s ease, box-shadow .16s ease;
  white-space:nowrap;
}

.btn:hover{
  transform:translateY(-1px);
  box-shadow:0 14px 30px rgba(15,23,42,.12);
}

.btn.primary{
  border-color:transparent;
  background:linear-gradient(135deg, rgba(var(--primary-rgb),1), rgba(var(--primary2-rgb),1));
  color:var(--on-primary);
  font-weight:800;
  box-shadow:0 18px 42px rgba(var(--primary-rgb),.24);
}

.btn.soft{
  background:rgba(var(--primary-rgb),.09);
  border-color:rgba(var(--primary-rgb),.16);
}

.page-kicker{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--chipbg);
  color:var(--muted);
  font-size:13px;
  line-height:1;
}

.page-kicker-dot{
  width:8px;
  height:8px;
  border-radius:999px;
  background:linear-gradient(135deg, var(--primary), var(--primary2));
  box-shadow:0 0 0 4px rgba(var(--primary-rgb),.12);
}

.page-hero{
  position:relative;
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:32px clamp(20px, 4vw, 36px);
  background:
    radial-gradient(720px 260px at 0% 0%, rgba(var(--primary-rgb),.14), transparent 65%),
    radial-gradient(680px 240px at 100% 0%, rgba(var(--primary2-rgb),.14), transparent 65%),
    linear-gradient(180deg, var(--panel), var(--panel2));
  box-shadow:var(--shadow);
  overflow:hidden;
}

.page-hero > *{position:relative;z-index:1}

.page-hero h1{
  margin:16px 0 12px;
  font-size:clamp(36px, 5vw, 56px);
  line-height:1.02;
  letter-spacing:-.05em;
}

.page-hero p{
  margin:0;
  color:var(--muted);
  line-height:1.82;
  max-width:72ch;
}

.page-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:24px;
}

.page-stats{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}

.page-stat{
  min-width:128px;
  padding:11px 14px;
  border-radius:16px;
  border:1px solid var(--border);
  background:var(--chipbg);
}

.page-stat strong{
  display:block;
  font-size:16px;
  line-height:1.2;
}

.page-stat span{
  display:block;
  margin-top:4px;
  font-size:12px;
  color:var(--faint);
}

.page-section{
  margin-top:20px;
}

.page-section-title{
  margin:0 0 12px;
  font-size:28px;
  line-height:1.12;
  letter-spacing:-.03em;
}

.page-grid{
  display:grid;
  gap:16px;
}

.page-grid.cols-2{
  grid-template-columns:repeat(2, minmax(0, 1fr));
}

.page-grid.cols-3{
  grid-template-columns:repeat(3, minmax(0, 1fr));
}

.page-card{
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height:100%;
  padding:20px;
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  background:linear-gradient(180deg, var(--panel), var(--panel2));
  box-shadow:var(--shadow-soft);
}

.page-card h2,
.page-card h3{
  margin:0;
  line-height:1.24;
}

.page-card p{
  margin:0;
  color:var(--muted);
  line-height:1.78;
}

.page-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:auto;
  font-weight:700;
  color:var(--text);
}

.page-link::after{
  content:"→";
  opacity:.66;
  transition:transform .16s ease;
}

.page-link:hover::after{
  transform:translateX(3px);
}

.card .cta .btn:first-child{
  background:rgba(var(--primary-rgb),.10);
  border-color:rgba(var(--primary-rgb),.22);
  font-weight:700;
  color:var(--text);
}

.theme-toggle-btn{
  width:34px;
  height:34px;
  border:1px solid var(--border);
  border-radius:999px;
  padding:0;
  background:linear-gradient(135deg, rgba(var(--primary-rgb),.18), rgba(var(--primary2-rgb),.14));
  color:var(--text);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:transform .15s ease, filter .15s ease, background .15s ease;
}

.theme-toggle-btn:hover{
  transform:translateY(-1px);
  filter:brightness(1.04);
}

.theme-toggle-btn:active{
  transform:translateY(0) scale(.98);
}

.theme-toggle-btn:focus-visible{
  outline:2px solid rgba(var(--primary-rgb),.55);
  outline-offset:3px;
}

.theme-toggle-btn .icon,
[data-theme-icon]{
  width:18px;
  height:18px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  line-height:1;
}

[data-theme-icon] svg{
  width:18px;
  height:18px;
  display:block;
}

.nav.spec-site-header{
  position:sticky;
  top:0;
  z-index:80;
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  background:linear-gradient(180deg, var(--navbg), rgba(255,255,255,0));
  border-bottom:1px solid var(--border);
}

.nav.spec-site-header .nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  max-width:var(--content-max);
  margin:0 auto;
  padding:14px 24px;
  gap:16px;
}

.nav.spec-site-header .brand{
  display:flex;
  gap:10px;
  align-items:center;
  min-width:0;
  font-weight:800;
  letter-spacing:.01em;
}

.nav.spec-site-header .logo{
  width:34px;
  height:34px;
  border-radius:12px;
  background:
    radial-gradient(14px 14px at 28% 30%, rgba(255,255,255,.9), transparent 60%),
    linear-gradient(135deg, rgba(var(--primary-rgb),1), rgba(var(--primary2-rgb),1));
  box-shadow:0 10px 28px rgba(var(--primary-rgb),.25);
  border:1px solid rgba(255,255,255,.18);
  flex:0 0 auto;
}

.nav.spec-site-header .nav-links{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  color:var(--muted);
  font-size:14px;
  flex:1 1 auto;
  min-width:0;
}

.nav.spec-site-header .nav-links a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:9px 11px;
  border-radius:999px;
  line-height:1;
  transition:background .16s ease, color .16s ease, transform .16s ease;
}

.nav.spec-site-header .nav-link-text{
  white-space:nowrap;
}

.nav.spec-site-header .nav-hot-badge{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:16px;
  padding:0 6px;
  border-radius:999px;
  font-size:10px;
  line-height:1;
  letter-spacing:.06em;
  font-weight:800;
  text-transform:uppercase;
  color:#fff;
  background:linear-gradient(135deg, #ff6a00, #ff2d20);
  box-shadow:0 4px 10px rgba(255,82,0,.28);
}

.nav.spec-site-header .nav-links a:hover{
  background:var(--chipbg);
  color:var(--text);
  transform:translateY(-1px);
}

.nav.spec-site-header .nav-links a.is-active,
.nav.spec-site-header .nav-links a[aria-current="page"]{
  background:rgba(var(--primary-rgb),.12);
  color:var(--text);
}

.nav.spec-site-header .controls{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.nav.spec-site-header .icon-btn{
  width:36px;
  height:36px;
  border:0;
  padding:0;
  border-radius:999px;
  background:transparent;
  color:var(--muted);
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  transition:transform .15s ease, background .15s ease, color .15s ease;
}

.nav.spec-site-header .icon-btn:hover{
  background:rgba(255,255,255,.20);
  transform:translateY(-1px);
  color:var(--text);
}

html[data-theme="dark"] .nav.spec-site-header .icon-btn:hover{
  background:rgba(255,255,255,.08);
}

.nav.spec-site-header .icon-btn:active{
  transform:translateY(0) scale(.98);
}

.nav.spec-site-header .icon-btn:focus-visible{
  outline:2px solid rgba(var(--primary-rgb),.55);
  outline-offset:3px;
}

.nav.spec-site-header .icon-btn .icon{
  width:22px;
  height:22px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  position:relative;
  font-weight:800;
}

.nav.spec-site-header .icon-btn .icon svg{
  width:20px;
  height:20px;
  display:block;
}

.nav.spec-site-header .lang-glyph{
  font-size:16px;
  line-height:1;
  transform:translateY(1px);
  display:inline-block;
}

.nav.spec-site-header .lang-star{
  font-size:10px;
  position:absolute;
  right:-6px;
  top:-6px;
  opacity:.85;
}

.nav.spec-site-header .menu-btn{
  display:none;
}

.nav.spec-site-header .menu-icon svg{
  width:20px;
  height:20px;
  display:block;
}

.nav.spec-site-header .nav-menu{
  position:fixed;
  inset:0;
  opacity:0;
  pointer-events:none;
  transition:opacity .18s ease;
}

.nav.spec-site-header.is-menu-open .nav-menu{
  opacity:1;
  pointer-events:auto;
}

.nav.spec-site-header .nav-menu-backdrop{
  position:absolute;
  inset:0;
  border:0;
  padding:0;
  background:rgba(8,11,22,.28);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}

.nav.spec-site-header .nav-menu-panel{
  position:absolute;
  top:76px;
  right:16px;
  left:16px;
  max-width:390px;
  margin-left:auto;
  padding:18px;
  border:1px solid var(--border);
  border-radius:24px;
  background:linear-gradient(180deg, var(--panel), rgba(255,255,255,.78));
  box-shadow:var(--shadow);
  transform:translateY(-10px);
  transition:transform .22s ease;
}

html[data-theme="dark"] .nav.spec-site-header .nav-menu-panel{
  background:linear-gradient(180deg, rgba(17,24,39,.95), rgba(10,16,34,.88));
}

.nav.spec-site-header.is-menu-open .nav-menu-panel{
  transform:translateY(0);
}

.nav.spec-site-header .nav-menu-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:12px;
}

.nav.spec-site-header .nav-menu-title{
  font-size:13px;
  font-weight:800;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--faint);
}

.nav.spec-site-header .nav-menu-links{
  display:grid;
  gap:8px;
}

.nav.spec-site-header .nav-menu-links a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 16px;
  border-radius:18px;
  border:1px solid transparent;
  color:var(--muted);
  background:transparent;
  transition:background .16s ease, border-color .16s ease, color .16s ease;
}

.nav.spec-site-header .nav-menu-links a:hover{
  background:var(--chipbg);
  color:var(--text);
}

.nav.spec-site-header .nav-menu-links a.is-active,
.nav.spec-site-header .nav-menu-links a[aria-current="page"]{
  background:rgba(var(--primary-rgb),.12);
  border-color:rgba(var(--primary-rgb),.16);
  color:var(--text);
}

.nav.spec-site-header .nav-menu-links a::after{
  content:"→";
  opacity:.54;
}

.nav.spec-site-header .nav-menu-meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:14px;
  padding-top:14px;
  border-top:1px solid var(--border);
}

.nav.spec-site-header .nav-menu-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:40px;
  padding:0 12px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--chipbg);
  color:var(--text);
  font-size:14px;
}

body.spec-nav-open{
  overflow:hidden;
}

@media (max-width:960px){
  .wrap{
    padding:28px 20px 0;
  }

  .page-hero{
    padding:24px 20px;
  }

  .page-grid.cols-2,
  .page-grid.cols-3{
    grid-template-columns:1fr;
  }

  .nav.spec-site-header .nav-inner{
    padding:12px 16px;
    gap:12px;
  }

  .nav.spec-site-header .brand span:last-child{
    max-width:140px;
    overflow:hidden;
    text-overflow:ellipsis;
    white-space:nowrap;
  }

  .nav.spec-site-header .nav-links{
    display:none;
  }

  .nav.spec-site-header .controls{
    gap:8px;
  }

  .nav.spec-site-header .menu-btn{
    display:inline-flex;
  }
}

@media (max-width:680px){
  .page-actions,
  .page-stats{
    gap:10px;
  }

  .page-stat{
    flex:1 1 calc(50% - 10px);
    min-width:0;
  }

  .nav.spec-site-header .nav-menu-panel{
    top:68px;
    left:12px;
    right:12px;
    padding:16px;
  }
}

/* ── READING PROGRESS BAR ── */
#spec-progress-bar{
  position:fixed;
  top:0;
  left:0;
  height:3px;
  width:0;
  z-index:10000;
  background:linear-gradient(90deg,var(--primary),var(--primary2));
  transition:width .08s linear;
  pointer-events:none;
  border-radius:0 2px 2px 0;
}

/* ── BACK TO TOP ── */
#spec-back-top{
  position:fixed;
  bottom:28px;
  right:24px;
  width:42px;
  height:42px;
  border-radius:50%;
  border:1px solid var(--border);
  background:var(--panel);
  color:var(--text);
  font-size:20px;
  line-height:1;
  cursor:pointer;
  z-index:998;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 8px 28px rgba(15,23,42,.18);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  opacity:0;
  transform:translateY(12px);
  transition:opacity .22s ease,transform .22s ease,background .16s ease;
  pointer-events:none;
}
#spec-back-top.visible{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}
#spec-back-top:hover{
  background:var(--chipbg);
  transform:translateY(-2px);
}

/* ── COPY BUTTON ── */
.spec-pre-wrap{
  position:relative;
}
.spec-copy-btn{
  position:absolute;
  top:10px;
  right:10px;
  padding:4px 10px;
  border-radius:8px;
  border:1px solid var(--border);
  background:var(--panel2);
  color:var(--faint);
  font-size:12px;
  cursor:pointer;
  z-index:2;
  transition:color .16s ease,background .16s ease,border-color .16s ease;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  line-height:1.6;
}
.spec-copy-btn:hover{
  color:var(--text);
  background:var(--chipbg);
}
.spec-copy-btn.copied{
  color:rgba(52,211,153,.9);
  border-color:rgba(52,211,153,.3);
}

/* ── READING TIME ── */
.spec-reading-time{
  margin:6px 0 0;
  font-size:13px;
  color:var(--faint);
}

/* ── TABLE OF CONTENTS ── */
.spec-toc{
  margin-top:16px;
  padding:18px;
}
.spec-toc h2{
  margin:0 0 12px;
}
.spec-toc-list{
  margin:0;
  padding-left:20px;
  display:grid;
  gap:7px;
  color:var(--muted);
}
.spec-toc-list a{
  color:var(--muted);
  text-decoration:none;
  transition:color .16s ease;
  line-height:1.5;
}
.spec-toc-list a:hover{
  color:var(--text);
}

/* ── CARD MOUSE-FOLLOW GLOW ── */
.grid3 .card.glow-active,
.page-grid .page-card.glow-active{
  background:
    radial-gradient(260px 180px at var(--mx,50%) var(--my,50%),
      rgba(var(--primary-rgb),.07),transparent 70%),
    var(--panel2);
}

/* ── BREADCRUMB ── */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:6px;
  margin-bottom:14px;
  font-size:13px;
  color:var(--faint);
}
.breadcrumb a{
  color:var(--muted);
  text-decoration:none;
  transition:color .16s;
}
.breadcrumb a:hover{color:var(--text);}
.breadcrumb-sep{opacity:.4;}

/* ── TRUST BOX (used across blog, guides, templates) ── */
.trust-box{
  max-width:var(--reading-max,860px);
  margin:18px auto 0;
  border:1px solid var(--border);
  border-radius:16px;
  padding:14px;
  background:linear-gradient(180deg,var(--panel),var(--panel2,var(--panel)));
  box-shadow:var(--shadow-soft);
}
.trust-box h2{margin:0 0 8px;font-size:20px}
.trust-box ul{margin:10px 0 0;padding-left:18px;display:grid;gap:8px;color:var(--muted)}
.trust-box a{color:var(--text);text-decoration:underline;text-decoration-color:rgba(var(--primary-rgb),.45)}
.trust-box p{color:var(--muted);font-size:.9rem;line-height:1.6}

/* ── SKIP TO CONTENT ── */
.skip-to-content{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:9999;padding:.75rem 1.5rem;background:var(--primary);color:#fff;font-size:.875rem;font-weight:600;border-radius:0 0 8px 0;text-decoration:none}
.skip-to-content:focus{position:fixed;left:0;top:0;width:auto;height:auto;overflow:visible}

/* ── PRINT STYLES ── */
@media print{
  body{background:white!important;color:#111!important;font-size:12pt;line-height:1.6}
  .nav.spec-site-header,#spec-progress-bar,#spec-back-top,.spec-site-footer,.tag-filters,.blog-toolbar,.blog-feature-grid,.page-actions,.share-bar,.btn,.theme-toggle-btn,.menu-btn,.controls,.newsletter-card,[aria-label="Social share"]{display:none!important}
  .wrap{max-width:100%!important;padding:0!important;margin:0!important}
  a{color:#111!important;text-decoration:underline}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:9pt;color:#666;word-break:break-all}
  a[href^="/"]::after{content:" (https://spec-coding.dev" attr(href) ")";font-size:9pt;color:#666}
  .card,.page-card,.page-hero{border:1px solid #ddd!important;box-shadow:none!important;background:white!important;break-inside:avoid}
  pre,code{background:#f5f5f5!important;border:1px solid #ddd;font-size:10pt}
  pre{white-space:pre-wrap;word-wrap:break-word;overflow:visible}
  img{max-width:100%;height:auto}
  h1,h2,h3{break-after:avoid;color:#111!important}
  .breadcrumb{font-size:10pt;color:#666!important}
  .breadcrumb a::after{content:none!important}
}