/* ============================================================================
   VPNJM · base layer
   Design tokens, reset, typography, page chrome (announce bar / header / footer),
   buttons, generic panels, reveal transitions and narrow-screen guards.
   Component-level styles live in components.css.
   ========================================================================== */

:root{
  /* — surfaces ————————————————————————————— */
  --bg:#E7EDF8;
  --bg-mid:#EEF3FB;
  --bg-panel:#F8FAFF;
  --bg-panel-2:#D9E3F2;
  --bg-panel-3:#F1F5FC;
  --bg-panel-4:#EAF1FA;
  --paper:#FCF8F3;
  --white:#FFFFFF;

  /* — ink & lines ——————————————————————————— */
  --text:#1E2433;
  --text-muted:#5A6478;
  --ink-lift:#2A3244;
  --border:#C7D4E7;

  /* — brand ———————————————————————————————— */
  --accent:#5B3A22;
  --accent-dark:#3A2412;
  --accent-lift:#7C5330;

  /* — semantic ————————————————————————————— */
  --success:#1F7A5C;
  --warn:#A86400;
  --error:#B23A2E;

  /* — rgb channels for alpha layering ——————— */
  --accent-rgb:91 58 34;
  --text-rgb:30 36 51;
  --success-rgb:31 122 92;
  --warn-rgb:168 100 0;
  --error-rgb:178 58 46;
  --indigo-rgb:72 94 170;
  --violet-rgb:139 118 214;
  --panel-rgb:248 250 255;

  /* — flag inks ————————————————————————————— */
  --flag-red:#B4463A;
  --flag-ink:#22314F;
  --flag-green:#2C7A5B;

  /* — type ————————————————————————————————— */
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  /* — geometry ————————————————————————————— */
  --r-pill:999px;
  --r-lg:24px;
  --r-md:16px;
  --r-sm:10px;
  --r-xs:8px;
  --gutter:32px;
  --header-h:66px;

  /* — elevation ———————————————————————————— */
  --shadow-window:0 46px 84px -34px rgb(var(--accent-rgb)/.26),0 12px 28px -18px rgb(var(--text-rgb)/.18);
  --shadow-note:0 16px 28px -16px rgb(var(--text-rgb)/.34);
  --shadow-card:0 18px 36px -26px rgb(var(--text-rgb)/.46),inset 0 1px 0 var(--white);
  --shadow-soft:0 10px 22px -18px rgb(var(--text-rgb)/.42);
  --ring:0 0 0 3px rgb(var(--accent-rgb)/.20);
}

/* ── reset ─────────────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,dl,dd,figure,blockquote{margin:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg{display:block;max-width:100%}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}

/* ── typography ────────────────────────────────────────────────────────── */
h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--text);
  font-weight:800;
  letter-spacing:-.022em;
  line-height:1.14;
  text-wrap:balance;
}
h1{font-size:clamp(52px,4.6vw,68px);line-height:1.06;letter-spacing:-.025em}
h2{font-size:clamp(26px,2.9vw,38px);line-height:1.16}
h3{font-size:clamp(19px,1.5vw,23px);font-weight:700;letter-spacing:-.016em;line-height:1.3}
h4{font-size:16px;font-weight:700;letter-spacing:-.01em;line-height:1.4}
p{line-height:1.68}
strong{font-weight:700}

.lead{font-size:18px;line-height:1.65;color:var(--text-muted)}
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--text-muted);
  text-transform:uppercase;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.accent{color:var(--accent)}

/* long unbreakable strings (subscription URLs, package file names) */
code{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
  word-break:break-word;
  background:rgb(var(--text-rgb)/.055);
  border-radius:6px;
  padding:.1em .38em;
  color:var(--ink-lift);
}
pre{
  overflow-x:auto;
  max-width:100%;
  overscroll-behavior-x:contain;
}
pre code{overflow-wrap:normal;white-space:pre}

/* inline svg paint helpers (flags, logo gradient) */
.fl-red{fill:var(--flag-red)}
.fl-white{fill:var(--white)}
.fl-ink{fill:var(--flag-ink)}
.fl-green{fill:var(--flag-green)}
.g1{stop-color:var(--accent-lift)}
.g2{stop-color:var(--accent-dark)}

/* ── prose (article / doc body) ────────────────────────────────────────── */
.prose{font-size:15.5px;line-height:1.78;color:var(--text);min-width:0}
.prose > * + *{margin-top:16px}
.prose h2{margin-top:40px;font-size:clamp(24px,2.4vw,30px)}
.prose h3{margin-top:28px}
.prose ul,.prose ol{padding-left:1.25em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:6px}
.prose li::marker{color:rgb(var(--accent-rgb)/.6)}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px}
.prose blockquote{
  padding:12px 18px;
  border-left:3px solid var(--accent);
  background:rgb(var(--accent-rgb)/.05);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  color:var(--text-muted);
}
.prose pre{
  padding:14px 16px;
  border-radius:var(--r-sm);
  background:var(--bg-panel-3);
  border:1px solid var(--border);
}
.prose pre code{background:none;padding:0;font-size:12.5px;line-height:1.7;color:var(--ink-lift)}
.prose img{border-radius:var(--r-md);height:auto}
.prose hr{border:0;border-top:1px solid var(--border);margin:32px 0}

/* ── skip link ─────────────────────────────────────────────────────────── */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-56px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  height:36px;
  padding:0 16px;
  border-radius:var(--r-pill);
  background:var(--accent);
  color:var(--paper);
  font-size:13px;
  font-weight:600;
  transition:top .18s ease;
}
.skip-link:focus{top:8px}

/* ── page shell & atmosphere ───────────────────────────────────────────── */
.page{
  position:relative;
  min-height:100svh;
  display:flex;
  flex-direction:column;
  overflow-x:clip;
  background:linear-gradient(180deg,var(--bg) 0%,var(--bg-mid) 42%,var(--bg-panel) 100%);
}
.bg{position:absolute;inset:0;z-index:0;overflow:clip;pointer-events:none}
.bg-glow{
  position:absolute;
  top:-260px;
  right:-8%;
  width:min(860px,74vw);
  max-width:100%;
  aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgb(var(--violet-rgb)/.30) 0%,rgb(var(--violet-rgb)/.13) 40%,rgb(var(--violet-rgb)/0) 68%);
}
.bg-glow2{
  position:absolute;
  top:180px;
  left:-14%;
  width:min(700px,66vw);
  max-width:100%;
  aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgb(var(--indigo-rgb)/.14) 0%,rgb(var(--indigo-rgb)/0) 66%);
}
.bg-dots{
  position:absolute;
  inset:0;
  background-image:radial-gradient(rgb(var(--indigo-rgb)/.06) 1px,transparent 1.1px);
  background-size:22px 22px;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,#000 48%,transparent 92%);
  mask-image:linear-gradient(180deg,#000 0%,#000 48%,transparent 92%);
}

/* content column: keeps horizontal breathing room at every breakpoint */
.wrap{
  position:relative;
  z-index:2;
  width:100%;
  max-width:calc(1180px + var(--gutter) * 2);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-top:64px;padding-bottom:64px}
.section-tight{padding-top:40px;padding-bottom:40px}
.section-head{display:flex;flex-direction:column;gap:10px;max-width:760px;margin-bottom:28px;min-width:0}
.section-head .lead{max-width:62ch}
.section-foot{margin-top:26px;display:flex;flex-wrap:wrap;align-items:center;gap:10px}

.page-head{padding-top:44px;padding-bottom:8px;position:relative;z-index:2}
.page-head h1{font-size:clamp(34px,3.8vw,52px);line-height:1.1}
.page-head .lead{margin-top:14px;max-width:70ch}

.hairline{height:1px;border:0;background:var(--border);margin:0}

/* ── buttons ───────────────────────────────────────────────────────────── */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:50px;
  padding:0 30px;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  text-align:center;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease;
}
.btn svg{flex:none}
.btn-primary{
  color:var(--paper);
  background:linear-gradient(180deg,var(--accent-lift) 0%,var(--accent) 58%,var(--accent-dark) 100%);
  box-shadow:0 16px 30px -14px rgb(var(--accent-rgb)/.68),inset 0 1px 0 rgb(255 255 255/.22),inset 0 -1px 0 rgb(0 0 0/.18);
}
.btn-primary:hover{
  transform:translateY(-1px);
  box-shadow:0 20px 34px -14px rgb(var(--accent-rgb)/.74),inset 0 1px 0 rgb(255 255 255/.26);
}
.btn-ghost{
  color:var(--text);
  background:rgb(var(--panel-rgb)/.55);
  border:1px solid rgb(var(--text-rgb)/.18);
  box-shadow:inset 0 1px 0 rgb(255 255 255/.8);
}
.btn-ghost:hover{
  background:rgb(var(--panel-rgb)/.95);
  border-color:rgb(var(--text-rgb)/.3);
  transform:translateY(-1px);
}
.btn-sm{height:42px;padding:0 22px;font-size:13.5px}
.btn-block{width:100%}
.btn[disabled],.btn[aria-disabled="true"]{opacity:.55;pointer-events:none}

/* ── announcement bar ──────────────────────────────────────────────────── */
.announce{
  position:relative;
  z-index:3;
  background:linear-gradient(90deg,var(--bg-panel-2) 0%,var(--bg-panel) 50%,var(--bg-panel-2) 100%);
  border-bottom:1px solid rgb(var(--text-rgb)/.07);
}
.announce-in{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:40px;
  font-size:12.5px;
  color:var(--text);
  letter-spacing:.01em;
}
.announce-sep{color:rgb(var(--text-rgb)/.35)}
.announce a{display:inline-flex;align-items:center;gap:4px;font-weight:600;color:var(--accent-dark)}
.announce a svg{transition:transform .18s ease}
.announce a:hover svg{transform:translateX(3px)}

/* ── header shell ──────────────────────────────────────────────────────── */
#site-header{position:relative;z-index:60}
.topbar{
  position:relative;
  z-index:4;
  background:rgb(var(--panel-rgb)/.68);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  border-bottom:1px solid rgb(var(--text-rgb)/.06);
}
.topbar-in{display:flex;align-items:center;gap:26px;height:var(--header-h)}

.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:32px;height:32px;filter:drop-shadow(0 6px 12px rgb(var(--accent-rgb)/.26))}
.brand-word{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--text);
  white-space:nowrap;
}
.brand-cn{
  font-size:12.5px;
  font-weight:500;
  color:var(--text-muted);
  padding-left:10px;
  border-left:1px solid var(--border);
  line-height:1;
  white-space:nowrap;
}

/* desktop nav — the <ul> itself must be the flex row */
.nav{display:flex;align-items:center;margin-left:auto;min-width:0}
.nav ul{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav li{flex:none}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:5px;
  height:34px;
  padding:0 13px;
  border-radius:var(--r-pill);
  font-size:13.5px;
  color:var(--text-muted);
  white-space:nowrap;
  transition:color .18s ease,background .18s ease;
}
.nav-link:hover{color:var(--text);background:rgb(var(--text-rgb)/.05)}
.nav-link.is-active{
  color:var(--text);
  font-weight:600;
  background:rgb(var(--panel-rgb)/.9);
  box-shadow:inset 0 0 0 1px rgb(var(--text-rgb)/.08),0 1px 2px rgb(var(--text-rgb)/.06);
}
.nav-more{position:relative}
.nav-more-btn svg{transition:transform .18s ease}
.nav-more:hover .nav-more-btn svg,
.nav-more:focus-within .nav-more-btn svg,
.nav-more.is-open .nav-more-btn svg{transform:rotate(180deg)}
.more-menu{
  position:absolute;
  top:calc(100% + 8px);
  left:50%;
  transform:translate(-50%,-6px);
  min-width:152px;
  padding:6px;
  border-radius:14px;
  background:var(--bg-panel);
  border:1px solid rgb(var(--text-rgb)/.08);
  box-shadow:0 24px 44px -22px rgb(var(--text-rgb)/.42),inset 0 1px 0 var(--white);
  display:flex;
  flex-direction:column;
  gap:2px;
  opacity:0;
  visibility:hidden;
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
}
.nav-more:hover .more-menu,
.nav-more:focus-within .more-menu,
.nav-more.is-open .more-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.more-menu a{
  display:flex;
  align-items:center;
  min-height:34px;
  padding:8px 10px;
  border-radius:9px;
  font-size:13.5px;
  color:var(--text-muted);
  transition:background .16s ease,color .16s ease;
}
.more-menu a:hover,.more-menu a[aria-current="page"]{background:rgb(var(--text-rgb)/.05);color:var(--text)}

/* right-hand tools */
.topbar-right{display:flex;align-items:center;gap:8px;flex:none}
.lang-wrap{position:relative}
.lang-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:5px;
  height:34px;
  padding:0 10px;
  border-radius:var(--r-pill);
  font-size:12.5px;
  color:var(--text-muted);
  white-space:nowrap;
  transition:color .18s ease,background .18s ease;
}
.lang-btn:hover{color:var(--text);background:rgb(var(--text-rgb)/.05)}
.lang-btn svg{flex:none;transition:transform .18s ease}
.lang-wrap.is-open .lang-btn svg{transform:rotate(180deg)}
.lang-menu{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  min-width:156px;
  padding:6px;
  border-radius:14px;
  background:var(--bg-panel);
  border:1px solid rgb(var(--text-rgb)/.08);
  box-shadow:0 24px 44px -22px rgb(var(--text-rgb)/.42),inset 0 1px 0 var(--white);
  display:flex;
  flex-direction:column;
  gap:2px;
  opacity:0;
  visibility:hidden;
  transform:translateY(-6px);
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
}
.lang-wrap.is-open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  min-height:36px;
  padding:8px 10px;
  border-radius:9px;
  font-size:13.5px;
  color:var(--text-muted);
}
.lang-menu a:hover{background:rgb(var(--text-rgb)/.05);color:var(--text)}
.lang-menu a[aria-current="true"]{color:var(--accent);font-weight:600;background:rgb(var(--accent-rgb)/.07)}
.lang-menu .lang-code{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--text-muted);opacity:.8}

.btn-login{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:36px;
  padding:0 18px;
  border-radius:var(--r-pill);
  font-size:13px;
  font-weight:600;
  color:var(--paper);
  background:linear-gradient(180deg,var(--ink-lift) 0%,var(--text) 100%);
  box-shadow:0 10px 20px -12px rgb(var(--text-rgb)/.8),inset 0 1px 0 rgb(255 255 255/.14);
  white-space:nowrap;
  transition:transform .18s ease,box-shadow .18s ease;
}
.btn-login:hover{transform:translateY(-1px);box-shadow:0 14px 24px -12px rgb(var(--text-rgb)/.85),inset 0 1px 0 rgb(255 255 255/.18)}

/* hamburger — lives in the tools area, never inside the drawer */
.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  min-width:44px;
  min-height:44px;
  border-radius:12px;
  color:var(--text);
  background:rgb(var(--panel-rgb)/.72);
  box-shadow:inset 0 0 0 1px rgb(var(--text-rgb)/.08);
}
.nav-toggle:hover{background:var(--bg-panel)}
.nav-toggle svg{width:20px;height:20px}
.nav-toggle .ico-close{display:none}
html.nav-open .nav-toggle .ico-open{display:none}
html.nav-open .nav-toggle .ico-close{display:block}

/* mobile drawer + veil — siblings of the top bar, above page content */
.nav-veil{
  position:fixed;
  inset:0;
  z-index:1;
  display:none;
  background:rgb(var(--text-rgb)/.38);
  -webkit-backdrop-filter:blur(2px);
  backdrop-filter:blur(2px);
}
.nav-drawer{
  position:fixed;
  left:0;
  right:0;
  top:var(--header-h);
  bottom:0;
  z-index:2;
  display:none;
  flex-direction:column;
  gap:2px;
  padding:12px var(--gutter) calc(28px + env(safe-area-inset-bottom,0px));
  background:var(--bg-panel);
  border-top:1px solid var(--border);
  box-shadow:0 30px 60px -34px rgb(var(--text-rgb)/.55);
  overflow-y:auto;
  overscroll-behavior:contain;
  max-height:calc(100dvh - var(--header-h));
}
html.nav-open .nav-veil{display:block}
html.nav-open .nav-drawer{display:flex}
html.nav-open{overflow:hidden}
.nav-drawer a{
  display:flex;
  align-items:center;
  width:100%;
  min-height:48px;
  padding:10px 12px;
  border-radius:12px;
  font-size:15px;
  color:var(--text);
}
.nav-drawer a:hover,.nav-drawer a:focus-visible{background:rgb(var(--text-rgb)/.05)}
.nav-drawer a.is-active{font-weight:700;color:var(--accent);background:rgb(var(--accent-rgb)/.08)}
.nav-drawer .drawer-label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--text-muted);
  padding:12px 12px 4px;
}
.nav-drawer .drawer-sep{height:1px;background:var(--border);margin:8px 0}
.nav-drawer .drawer-login{
  margin-top:10px;
  justify-content:center;
  min-height:46px;
  font-weight:600;
  color:var(--paper);
  background:linear-gradient(180deg,var(--ink-lift) 0%,var(--text) 100%);
  box-shadow:0 10px 20px -12px rgb(var(--text-rgb)/.8);
}
.nav-drawer .drawer-lang{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:44px;
  padding:10px 12px;
  border-radius:12px;
  font-size:14px;
  color:var(--text-muted);
}
.nav-drawer .drawer-lang[aria-current="true"]{color:var(--accent);font-weight:600;background:rgb(var(--accent-rgb)/.07)}

/* ── footer ────────────────────────────────────────────────────────────── */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:72px;
  background:linear-gradient(180deg,var(--bg-panel) 0%,var(--bg-panel-3) 62%,var(--bg-panel-2) 100%);
  border-top:1px solid rgb(var(--text-rgb)/.08);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,rgb(var(--accent-rgb)/.55) 0%,rgb(var(--accent-rgb)/.16) 46%,rgb(var(--accent-rgb)/0) 100%);
}
.footer-in{padding-top:52px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.6fr .9fr 1.1fr .9fr;gap:32px 40px;min-width:0}
.footer-brand{min-width:0}
.footer-tagline{margin-top:12px;font-size:13px;line-height:1.7;color:var(--text-muted);max-width:36ch}
.footer-facts{margin-top:14px;display:flex;flex-direction:column;gap:5px;font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--text-muted)}
.footer-facts li{display:flex;align-items:center;gap:7px}
.footer-facts li::before{content:"";width:4px;height:4px;border-radius:50%;background:rgb(var(--accent-rgb)/.5);flex:none}
.footer-h{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--text-muted);
  margin-bottom:12px;
}
.footer-links{display:flex;flex-direction:column;gap:0;min-width:0}
.footer-links a{
  display:inline-flex;
  align-items:center;
  min-height:30px;
  font-size:13.5px;
  color:var(--text-muted);
  transition:color .16s ease;
}
.footer-links a:hover{color:var(--accent)}
.footer-tags{display:flex;flex-wrap:wrap;gap:6px;min-width:0}
.footer-tag{
  display:inline-flex;
  align-items:center;
  max-width:100%;
  overflow:hidden;
  min-height:26px;
  padding:3px 10px;
  border-radius:var(--r-pill);
  background:rgb(var(--panel-rgb)/.85);
  border:1px solid rgb(var(--text-rgb)/.10);
  font-size:11.5px;
  color:var(--text-muted);
  white-space:nowrap;
  text-overflow:ellipsis;
  transition:color .16s ease,border-color .16s ease,background .16s ease;
}
.footer-tag:hover{color:var(--accent);border-color:rgb(var(--accent-rgb)/.28);background:rgb(var(--accent-rgb)/.06)}
.footer-lang{display:flex;flex-wrap:wrap;gap:6px}
.footer-lang a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:30px;
  min-width:44px;
  padding:4px 10px;
  border-radius:var(--r-pill);
  background:rgb(var(--panel-rgb)/.85);
  border:1px solid rgb(var(--text-rgb)/.10);
  font-size:12px;
  color:var(--text-muted);
  white-space:nowrap;
}
.footer-lang a:hover{color:var(--text);border-color:rgb(var(--text-rgb)/.2)}
.footer-lang a[aria-current="true"]{color:var(--accent);font-weight:600;border-color:rgb(var(--accent-rgb)/.26);background:rgb(var(--accent-rgb)/.07)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:36px;
  padding-top:18px;
  border-top:1px solid rgb(var(--text-rgb)/.08);
  font-size:12px;
  color:var(--text-muted);
}
.footer-copy{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px;font-size:12px;color:var(--text-muted)}
.footer-legal a:hover{color:var(--accent)}

/* ── generic panels / cards ────────────────────────────────────────────── */
.panel{
  position:relative;
  min-width:0;
  padding:24px;
  border-radius:var(--r-lg);
  background:linear-gradient(180deg,var(--white),var(--bg-panel-3));
  border:1px solid rgb(var(--text-rgb)/.08);
  box-shadow:var(--shadow-card);
}
.panel-flat{background:var(--bg-panel);box-shadow:none}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.panel-title{font-size:16px;font-weight:700;letter-spacing:-.01em}

/* ── reveal (visibility owned by reveal.js; default state is visible) ───── */
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}

/* ── line-status scaffold guard (servers.js injects into it) ───────────── */
#server-status{
  position:relative;
  display:block;
  width:100%;
  max-width:100%;
  overflow:hidden;
  margin-top:0;
  margin-bottom:24px;
}
#server-status > *{max-width:100%}

/* ── responsive ────────────────────────────────────────────────────────── */
@media (max-width:1100px){
  :root{--gutter:24px}
  .nav-link{padding:0 10px}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:28px 32px}
  .footer-col-lang{grid-column:1 / -1}
}

@media (max-width:900px){
  #site-header{position:sticky;top:0}
  .nav{display:none}
  .topbar-in{justify-content:space-between}
  .topbar-right{margin-left:auto}
  .nav-toggle{display:inline-flex}
  html.nav-open .announce{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col-lang{grid-column:auto}
}

@media (max-width:768px){
  h1{font-size:clamp(28px,8vw,40px);line-height:1.12}
  h2{font-size:clamp(23px,5.4vw,30px)}
  .lead{font-size:16.5px}
  .section{padding-top:48px;padding-bottom:48px}
  .page-head{padding-top:32px}
}

@media (max-width:640px){
  :root{--gutter:16px;--header-h:60px}
  .no-break{white-space:normal}
  .announce-in{height:auto;padding-top:8px;padding-bottom:8px;flex-wrap:wrap;gap:4px 6px;font-size:12px}
  .topbar-in{height:var(--header-h);gap:12px}
  .brand-cn{display:none}
  .brand-word{font-size:17.5px}
  .lang-btn{width:44px;min-width:44px;padding:0}
  .lang-btn .lang-label{display:none}
  .btn-login{height:34px;padding:0 14px;font-size:12.5px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-in{padding-top:40px}
  .footer-bottom{margin-top:26px}
  .panel{padding:18px}
  .section-foot .btn{width:100%}
}

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

/* 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 */