/* ==========================================================================
   VPNPX . base.css
   1. Design tokens   2. Reset   3. Typography   4. Layout shell
   5. Buttons & chips 6. Header   7. Footer   8. Reveal & a11y guards
   Palette: cool-tinted light "pixel switchboard"
   ========================================================================== */

/* ---------------------------------------------------------------- 1. tokens */
:root{
  /* surfaces: base -> atmosphere -> panel -> recessed */
  --bg:#E6EAF8;
  --bg-top:#EDF1FC;
  --bg-bottom:#DDE4F6;
  --bg-panel:#F6F8FE;
  --bg-panel-2:#D8E0F4;
  --surface:#FFFFFF;

  /* hairlines */
  --border:#C7D2EC;
  --border-soft:#D8E0F4;

  /* brand + status */
  --accent:#3A2ED9;
  --accent-dark:#2A1FA6;
  --violet:#7D6BFF;
  --pink:#F0559B;
  --warn:#F2A93B;
  --success:#1FA971;
  --error:#EF4E5E;

  /* ink */
  --text:#141A2E;
  --text-muted:#5A6483;
  --text-on-accent:#FFFFFF;
  --success-ink:#0E7A52;
  --pink-ink:#C22C74;
  --warn-ink:#8A5A05;

  /* flag fills (inline SVG only) */
  --flag-red:#DE2910;
  --flag-red-alt:#D0342C;
  --flag-blue:#1B3F94;
  --flag-white:#FFFFFF;

  /* alpha ramps */
  --accent-a06:rgba(58,46,217,.06);
  --accent-a10:rgba(58,46,217,.10);
  --accent-a12:rgba(58,46,217,.12);
  --accent-a20:rgba(58,46,217,.20);
  --accent-a35:rgba(58,46,217,.35);
  --accent-a40:rgba(58,46,217,.40);
  --accent-a45:rgba(58,46,217,.45);
  --violet-a10:rgba(125,107,255,.10);
  --violet-a14:rgba(125,107,255,.14);
  --violet-a18:rgba(125,107,255,.18);
  --violet-a28:rgba(125,107,255,.28);
  --pink-a10:rgba(240,85,155,.10);
  --pink-a14:rgba(240,85,155,.14);
  --success-a12:rgba(31,169,113,.12);
  --success-a14:rgba(31,169,113,.14);
  --warn-a12:rgba(242,169,59,.12);
  --warn-a14:rgba(242,169,59,.14);
  --error-a12:rgba(239,78,94,.12);
  --ink-a10:rgba(20,26,46,.10);
  --ink-a12:rgba(20,26,46,.12);
  --white-a35:rgba(255,255,255,.35);
  --white-a70:rgba(255,255,255,.70);
  --white-a80:rgba(255,255,255,.80);
  --white-a90:rgba(255,255,255,.90);

  /* chrome */
  --header-bg:rgba(246,248,254,.82);
  --grid-line:rgba(58,46,217,.055);
  --mask-solid:#000000;

  /* elevation */
  --shadow-soft:0 30px 70px -30px rgba(58,46,217,.30), 0 6px 18px -8px rgba(20,26,46,.08);
  --shadow-card:0 20px 44px -20px rgba(58,46,217,.28);
  --shadow-float:0 16px 30px -12px var(--accent-a45), inset 0 1px 0 var(--white-a35);

  /* radii */
  --radius-xl:28px;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:10px;
  --radius-pill:999px;

  /* layout */
  --header-h:72px;
  --page-max:1280px;
  --gutter:40px;

  /* type stacks */
  --font-display:Inter,"Noto Sans SC","Noto Sans JP","Noto Sans KR",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:Inter,"Noto Sans SC","Noto Sans JP","Noto Sans KR",-apple-system,"Segoe UI","Hiragino Sans","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Noto Sans SC",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* stacking */
  --z-float:50;
  --z-veil:60;
  --z-header:70;
}

/* ----------------------------------------------------------------- 2. reset */
*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}
html.nav-open{overflow:hidden;}

body{
  margin:0;
  padding:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  color:var(--text);
  background-color:var(--bg);
  background-image:
    radial-gradient(92% 64% at 82% -12%, var(--violet-a28), transparent 64%),
    radial-gradient(72% 52% at -8% 14%, var(--accent-a10), transparent 60%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg) 52%, var(--bg-bottom) 100%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

img,svg{max-width:100%;}
img{display:block;height:auto;}
a{color:inherit;}
button{font:inherit;}
ul,ol{margin:0 0 14px;padding-left:1.15em;}
li{margin:0 0 6px;}
hr{border:0;border-top:1px solid var(--border);margin:28px 0;}

.svg-defs{position:absolute;width:0;height:0;overflow:hidden;}

/* ------------------------------------------------------------- 3. typography */
h1,.h1,h2,.h2,h3,.h3,h4,.h4{
  font-family:var(--font-display);
  font-weight:800;
  color:var(--text);
  letter-spacing:-.03em;
  line-height:1.12;
  margin:0 0 14px;
  text-wrap:balance;
}
h1,.h1{font-size:clamp(34px,4.4vw,60px);line-height:1.08;letter-spacing:-.03em;}
h2,.h2{font-size:clamp(26px,3.1vw,40px);}
h3,.h3{font-size:clamp(19px,1.9vw,24px);letter-spacing:-.02em;line-height:1.25;}
h4,.h4{font-size:17px;letter-spacing:-.015em;line-height:1.35;font-weight:700;}

p{margin:0 0 14px;}
p:last-child{margin-bottom:0;}

strong{font-weight:700;color:var(--text);}
small{font-size:12.5px;color:var(--text-muted);}

.mono{font-family:var(--font-mono);letter-spacing:-.01em;}
.muted{color:var(--text-muted);}
.accent-text{color:var(--accent);}
.lede{font-size:17px;line-height:1.72;color:var(--text-muted);max-width:62ch;}

/* CJK keyword protection: only 2-4 hanzi per .no-break */
.no-break{white-space:nowrap;}

code,kbd,samp{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
  word-break:break-word;
}
code{
  padding:2px 6px;
  border-radius:6px;
  background:var(--bg-panel-2);
  color:var(--accent-dark);
}
pre{
  margin:0 0 18px;
  padding:16px 18px;
  max-width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  border-radius:var(--radius-md);
  border:1px solid var(--border-soft);
  background:var(--surface);
}
pre code{padding:0;background:none;color:var(--text);}

blockquote{
  margin:0 0 18px;
  padding:2px 0 2px 18px;
  border-left:3px solid var(--violet);
  color:var(--text-muted);
}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:999;
  padding:10px 16px;
  border-radius:0 0 var(--radius-md) 0;
  background:var(--accent);
  color:var(--text-on-accent);
  text-decoration:none;
}
.skip-link:focus{left:0;}

/* ------------------------------------------------------------ 4. layout shell */
.wrap{
  width:100%;
  max-width:var(--page-max);
  margin-left:auto;
  margin-right:auto;
  padding-inline:var(--gutter);
}

.sec{padding-top:64px;padding-bottom:64px;}
.sec--tight{padding-top:36px;padding-bottom:36px;}
.sec--flush{padding-top:0;padding-bottom:0;}

.section-head{
  max-width:760px;
  margin:0 auto 36px;
  text-align:center;
}
.section-head--left{margin-left:0;text-align:left;}
.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.2vw,44px);
  line-height:1.14;
  letter-spacing:-.03em;
  margin:0 0 12px;
  color:var(--text);
}
.section-lede{
  margin:0;
  font-size:16px;
  line-height:1.72;
  color:var(--text-muted);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 18px;
  padding:6px 14px 6px 11px;
  border-radius:var(--radius-pill);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:inset 0 1px 0 var(--white-a90);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--text-muted);
}
.eyebrow-dot{
  display:block;
  flex:none;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px var(--accent-a12);
}

.pixel-grid{
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size:22px 22px;
}

/* ------------------------------------------------------- 5. buttons & chips */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  min-height:48px;
  padding:14px 26px;
  border:1px solid transparent;
  border-radius:var(--radius-md);
  font-family:var(--font-display);
  font-size:15.5px;
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease;
}
.btn-sm{min-height:38px;padding:9px 16px;font-size:13.5px;border-radius:var(--radius-sm);}
.btn-block{width:100%;}
.btn .btn-arrow{display:block;flex:none;color:currentColor;}

.btn-primary{
  color:var(--text-on-accent);
  background:linear-gradient(132deg, var(--accent) 0%, var(--violet) 100%);
  box-shadow:0 16px 30px -14px var(--accent-a45), inset 0 1px 0 var(--white-a35);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 22px 38px -14px var(--accent-a45), inset 0 1px 0 var(--white-a35);
}
.btn-ghost{
  color:var(--accent-dark);
  background:var(--bg-panel);
  border-color:var(--border);
  box-shadow:inset 0 1px 0 var(--white-a90);
}
.btn-ghost:hover{background:var(--surface);}
.btn-secondary{
  color:var(--accent-dark);
  background:var(--accent-a10);
  border-color:transparent;
}
.btn-secondary:hover{background:var(--accent-a12);}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 16px;
  border-radius:var(--radius-pill);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:inset 0 1px 0 var(--white-a90);
  font-size:13.5px;
  font-weight:500;
  color:var(--text-muted);
  max-width:100%;
}
.chip.is-on{
  background:var(--violet-a18);
  border-color:transparent;
  color:var(--accent-dark);
  font-weight:600;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:5px;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.01em;
  max-width:100%;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  background:var(--accent-a10);
  color:var(--accent-dark);
}
.badge--success{background:var(--success-a14);color:var(--success-ink);}
.badge--pink{background:var(--pink-a14);color:var(--pink-ink);}
.badge--warn{background:var(--warn-a14);color:var(--warn-ink);}

.fact-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border-radius:var(--radius-pill);
  background:var(--bg-panel);
  border:1px solid var(--border-soft);
  font-size:12px;
  font-weight:600;
  color:var(--text-muted);
  max-width:100;
}
.fact-pill::before{
  content:"";
  flex:none;
  width:5px;height:5px;
  border-radius:50%;
  background:var(--accent);
}

/* ----------------------------------------------------------------- 6. header */
#site-header{
  position:sticky;
  top:0;
  z-index:var(--z-header);
  height:var(--header-h);
  background:var(--header-bg);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border-soft);
}

.header-bar,
.header-inner{
  position:relative;
  max-width:var(--page-max);
  height:100%;
  margin:0 auto;
  padding-inline:var(--gutter);
  display:flex;
  align-items:center;
  gap:24px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  text-decoration:none;
  flex:none;
  min-height:44px;
}
.brand-mark{display:block;width:30px;height:30px;flex:none;}
.brand-name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:-.025em;
  color:var(--text);
  white-space:nowrap;
}
.brand-zh{
  font-size:12.5px;
  font-weight:600;
  color:var(--text-muted);
  letter-spacing:.01em;
  white-space:nowrap;
}

.main-nav{display:flex;align-items:center;min-width:0;}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}
.nav-list li{margin:0;}
.nav-link{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:38px;
  padding:8px 15px;
  border-radius:var(--radius-pill);
  font-size:14.5px;
  font-weight:500;
  color:var(--text-muted);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s ease, background-color .18s ease;
}
.nav-link:hover{color:var(--accent-dark);background:var(--violet-a10);}
.nav-link.is-active{
  background:var(--violet-a18);
  color:var(--accent-dark);
  font-weight:600;
}

.nav-more{position:relative;}
.nav-more-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  min-height:38px;
  padding:8px 15px;
  border:0;
  border-radius:var(--radius-pill);
  background:transparent;
  font-family:inherit;
  font-size:14.5px;
  font-weight:500;
  color:var(--text-muted);
  white-space:nowrap;
  cursor:pointer;
  transition:color .18s ease, background-color .18s ease;
}
.nav-more:hover .nav-more-btn,
.nav-more:focus-within .nav-more-btn{color:var(--accent-dark);background:var(--violet-a10);}
.nav-more.is-active .nav-more-btn{background:var(--violet-a18);color:var(--accent-dark);font-weight:600;}

.nav-drop{
  position:absolute;
  top:calc(100% + 10px);
  left:0;
  min-width:180px;
  padding:8px;
  display:flex;
  flex-direction:column;
  gap:2px;
  border-radius:var(--radius-md);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-card);
  opacity:0;
  visibility:hidden;
  transform:translateY(-6px);
  transition:opacity .18s ease, transform .18s ease, visibility .18s;
}
.nav-more:hover .nav-drop,
.nav-more:focus-within .nav-drop{opacity:1;visibility:visible;transform:translateY(0);}
.nav-drop a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 12px;
  border-radius:9px;
  font-size:14px;
  color:var(--text-muted);
  text-decoration:none;
}
.nav-drop a:hover{background:var(--violet-a10);color:var(--accent-dark);}
.chev{display:block;flex:none;color:currentColor;}

.header-tools,
.header-actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
  flex:none;
}

.lang-switch{position:relative;}
.lang-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  min-height:38px;
  padding:0 13px;
  border-radius:var(--radius-pill);
  border:1px solid var(--border);
  background:var(--bg-panel);
  font-family:inherit;
  font-size:13.5px;
  color:var(--text-muted);
  cursor:pointer;
  white-space:nowrap;
}
.lang-btn:hover{color:var(--accent-dark);border-color:var(--violet);}
.lang-menu{
  position:absolute;
  top:calc(100% + 10px);
  right:0;
  z-index:5;
  min-width:170px;
  margin:0;
  padding:8px;
  list-style:none;
  display:none;
  flex-direction:column;
  gap:2px;
  border-radius:var(--radius-md);
  background:var(--bg-panel);
  border:1px solid var(--border);
  box-shadow:var(--shadow-card);
}
.lang-menu li{margin:0;}
.lang-switch.is-open .lang-menu{display:flex;}
.lang-menu a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:8px 12px;
  border-radius:9px;
  font-size:14px;
  color:var(--text-muted);
  text-decoration:none;
}
.lang-menu a:hover{background:var(--violet-a10);color:var(--accent-dark);}
.lang-menu a[aria-current="true"]{
  background:var(--violet-a14);
  color:var(--accent-dark);
  font-weight:700;
}

.login-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:40px;
  padding:0 21px;
  border-radius:var(--radius-pill);
  border:1px solid var(--accent);
  color:var(--accent);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .18s ease, color .18s ease;
}
.login-btn:hover{background:var(--accent);color:var(--text-on-accent);}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  min-width:44px;
  min-height:44px;
  padding:0;
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  background:var(--bg-panel);
  color:var(--accent-dark);
  cursor:pointer;
}
.nav-toggle .bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:background-color .18s ease;
}
.nav-toggle .bars::before,
.nav-toggle .bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s ease, top .18s ease;
}
.nav-toggle .bars::before{top:-6px;}
.nav-toggle .bars::after{top:6px;}
.nav-toggle[aria-expanded="true"] .bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .bars::before{top:0;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .bars::after{top:0;transform:rotate(-45deg);}

.mobile-nav,
.nav-drawer{display:none;}
.nav-veil{display:none;}

/* ----------------------------------------------------------------- 7. footer */
#site-footer{
  margin-top:80px;
  background:var(--bg-panel);
  border-top:1px solid var(--border);
}
.footer-inner{
  max-width:var(--page-max);
  margin:0 auto;
  padding:56px var(--gutter) 26px;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr);
  gap:36px 32px;
}
.footer-brand{display:flex;flex-direction:column;gap:14px;max-width:340px;min-width:0;}
.footer-brand .brand-mark{width:34px;height:34px;}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:-.025em;
  color:var(--text);
}
.footer-desc{
  margin:0;
  font-size:13.5px;
  line-height:1.75;
  color:var(--text-muted);
}
.footer-col{min-width:0;}
.footer-col-title{
  margin:0 0 12px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--text-muted);
}
.footer-links{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:4px;
}
.footer-links li{margin:0;}
.footer-links a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  font-size:13.5px;
  color:var(--text-muted);
  text-decoration:none;
}
.footer-links a:hover{color:var(--accent-dark);}

.footer-hot{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
}
.footer-hot li{margin:0;max-width:100%;}
.footer-hot a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  max-width:100%;
  padding:4px 10px;
  border-radius:var(--radius-pill);
  background:var(--bg-panel-2);
  font-size:12px;
  color:var(--text-muted);
  text-decoration:none;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.footer-hot a:hover{background:var(--violet-a18);color:var(--accent-dark);}

.footer-lang-list{
  display:flex;
  flex-wrap:wrap;
  gap:6px 8px;
  list-style:none;
  margin:0;
  padding:0;
}
.footer-lang-list li{margin:0;}
.footer-lang-list a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  padding:3px 10px;
  border-radius:var(--radius-pill);
  border:1px solid var(--border);
  background:var(--surface);
  font-size:12px;
  color:var(--text-muted);
  text-decoration:none;
  white-space:nowrap;
}
.footer-lang-list a:hover{border-color:var(--violet);color:var(--accent-dark);}
.footer-lang-list a[aria-current="true"]{
  background:var(--violet-a18);
  border-color:transparent;
  color:var(--accent-dark);
  font-weight:700;
}

.footer-bottom{
  margin-top:36px;
  padding-top:18px;
  border-top:1px solid var(--border);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 20px;
  font-size:12.5px;
  color:var(--text-muted);
}
.footer-copy{margin:0;}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:4px 16px;
  list-style:none;
  margin:0;
  padding:0;
}
.footer-legal li{margin:0;}
.footer-legal a{
  display:inline-flex;
  align-items:center;
  min-height:26px;
  color:var(--text-muted);
  text-decoration:none;
}
.footer-legal a:hover{color:var(--accent-dark);}

/* --------------------------------------------------- 8. reveal, guards, a11y */
.reveal{transition:opacity .6s ease, transform .6s ease;}
.reveal.pending{opacity:0;transform:translateY(16px);}

/* server-status scaffold must stay in flow and clip its own grid */
#server-status{
  position:relative;
  display:block;
  width:100%;
  max-width:100%;
  min-height:120px;
  overflow:hidden;
  margin-top:0;
  margin-bottom:28px;
}
#server-status > *{max-width:100%;}

/* decorative tilt never applies on small screens */
.tilt{transform-style:preserve-3d;}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

/* ----------------------------------------------------------- 9. breakpoints */
@media (max-width:1180px){
  :root{--gutter:32px;}
}
@media (max-width:1024px){
  :root{--gutter:26px;}
  .footer-grid{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr);}
  .footer-brand{grid-column:1 / -1;max-width:none;}
}
@media (max-width:1080px){
  .main-nav{display:none;}
  .nav-toggle{display:inline-flex;}
  .header-tools{margin-left:auto;}
  .mobile-nav{
    display:none;
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    z-index:3;
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    overscroll-behavior:contain;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-card);
    padding:10px var(--gutter) 22px;
  }
  .mobile-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px;}
  .mobile-nav li{margin:0;}
  .mobile-nav a{
    display:flex;
    align-items:center;
    width:100%;
    min-height:48px;
    padding:12px 14px;
    border-radius:var(--radius-md);
    font-size:15px;
    font-weight:600;
    color:var(--text);
    text-decoration:none;
  }
  .mobile-nav a:hover{background:var(--violet-a10);color:var(--accent-dark);}
  .mobile-nav a.is-active{background:var(--violet-a18);color:var(--accent-dark);}
  .mobile-nav .mobile-lang{
    margin-top:12px;
    padding-top:12px;
    border-top:1px solid var(--border-soft);
  }
  .mobile-nav .mobile-lang a{font-size:14px;font-weight:500;color:var(--text-muted);min-height:46px;}
  .mobile-nav .mobile-lang a[aria-current="true"]{background:var(--violet-a14);color:var(--accent-dark);font-weight:700;}
  .nav-drawer{
    display:none;
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    z-index:3;
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    overscroll-behavior:contain;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-card);
    padding:10px var(--gutter) 22px;
  }
  .nav-drawer a{
    display:flex;
    align-items:center;
    width:100%;
    min-height:48px;
    padding:12px 14px;
    border-radius:var(--radius-md);
    font-size:15px;
    font-weight:600;
    color:var(--text);
    text-decoration:none;
  }
  .nav-drawer a:hover{background:var(--violet-a10);color:var(--accent-dark);}
  .nav-drawer a.is-active{background:var(--violet-a18);color:var(--accent-dark);}
  .nav-drawer a[aria-current="true"]{background:var(--violet-a14);color:var(--accent-dark);font-weight:700;}
  .nav-drawer .col-head{
    margin:12px 0 6px;
    padding-top:12px;
    border-top:1px solid var(--border-soft);
    font-size:12px;
    font-weight:700;
    letter-spacing:.1em;
    color:var(--text-muted);
  }
  html.nav-open .mobile-nav{display:block;}
  html.nav-open .nav-drawer{display:block;}
  html.nav-open .nav-veil{
    display:block;
    position:fixed;
    inset:0;
    z-index:2;
    background:rgba(20,26,46,.30);
  }
}
@media (max-width:900px){
  .footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);}
}
@media (max-width:768px){
  :root{--gutter:22px;}
  .sec{padding-top:44px;padding-bottom:44px;}
  .section-head{margin-bottom:26px;}
  h1,.h1{font-size:clamp(30px,6.4vw,40px);}
  h2,.h2{font-size:clamp(23px,4.6vw,30px);}
  .lede{font-size:16px;}
  .footer-inner{padding-top:40px;}
}
@media (max-width:640px){
  :root{--gutter:18px;}
  .no-break{white-space:normal;}
  .tilt{transform:none !important;}
  .btn{width:auto;}
  .btn-block{width:100%;}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px;}
  .footer-bottom{align-items:flex-start;}
  .login-btn{padding:0 15px;font-size:13px;min-height:38px;}
  .header-actions .lang-switch{display:none;}
  .brand-zh{display:none;}
  .brand-name{font-size:17px;}
  .brand-mark{width:26px;height:26px;}
}
@media (max-width:400px){
  :root{--gutter:16px;}
  .header-bar{gap:12px;}
  .header-tools{gap:8px;}
  .lang-btn{padding:0 10px;font-size:12.5px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal,
  .reveal.pending{opacity:1 !important;transform:none !important;transition:none !important;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* lh:local-harden:start */
:is(h1,h2,h3,h4){text-wrap:balance}
:is(p,li,dd,dt,figcaption,blockquote,td,th){text-wrap:pretty}
html[lang|="ko"] body{word-break:keep-all;overflow-wrap:break-word}
html[lang|="ja"] :is(h1,h2,h3,h4){word-break:auto-phrase}
.lh-tscroll{overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch}
@media (max-width:640px){.lh-tscroll :is(th,td){min-width:5.5em}}
@supports (animation-timeline:scroll()){
  .float-cta{animation:lh-fab-in linear both;animation-timeline:scroll(root);animation-range:0 70vh}
}
@keyframes lh-fab-in{0%,45%{opacity:0;visibility:hidden}100%{opacity:1;visibility:visible}}
/* lh:local-harden:end */