/* ==========================================================================
   VPNOh — base.css
   Design tokens, reset, typography, site chrome (header / footer),
   buttons, reveal transition, a11y and overflow guards.
   ========================================================================== */

:root{
  /* --- palette ---------------------------------------------------------- */
  --bg:#F5EEDF;
  --bg-panel:#FDFAF3;
  --bg-panel-2:#EDE3CE;
  --border:#E0D3B8;
  --accent:#5E2BD0;
  --accent-dark:#4218A3;
  --text:#2B2118;
  --text-muted:#6F6255;
  --success:#2E9E5B;
  --warn:#E8951D;
  --error:#D8433F;
  --white:#FFFFFF;
  --hex-idle:#D8CDB5;
  --flag-red:#C8102E;
  --flag-blue:#2F3A7A;
  --hk-red:#DE2910;
  --jp-red:#BC002D;

  /* --- rgb triplets (alpha composition) --------------------------------- */
  --accent-rgb:94,43,208;
  --accent-dark-rgb:66,24,163;
  --text-rgb:43,33,24;
  --bg-rgb:245,238,223;
  --panel-rgb:253,250,243;
  --border-rgb:224,211,184;
  --success-rgb:46,158,91;
  --warn-rgb:232,149,29;
  --error-rgb:216,67,63;
  --hl-rgb:255,255,255;

  /* --- type ------------------------------------------------------------- */
  --font-display:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;

  /* --- geometry --------------------------------------------------------- */
  --r-sm:8px;
  --r-md:10px;
  --r-pill:999px;
  --gutter:24px;
  --maxw:1248px;          /* 1248 - 2 x 24 = 1200 content column */
  --header-h:58px;
  --notice-h:34px;
  --toc-h:52px;

  /* --- elevation -------------------------------------------------------- */
  --hl-edge:inset 0 1px 0 rgba(var(--hl-rgb),.9);
  --shadow-soft:0 10px 30px -12px rgba(var(--accent-rgb),.22);
  --shadow-panel:0 48px 100px -24px rgba(var(--accent-rgb),.24),0 22px 44px -18px rgba(var(--text-rgb),.22),inset 0 1px 0 rgba(var(--hl-rgb),.92);
  --shadow-card:0 18px 40px -26px rgba(var(--text-rgb),.45),var(--hl-edge);
  --shadow-lift:0 26px 52px -22px rgba(var(--accent-rgb),.42),var(--hl-edge);

  /* --- rhythm (8px grid) ------------------------------------------------ */
  --sp-1:4px;
  --sp-2:8px;
  --sp-3:12px;
  --sp-4:16px;
  --sp-5:24px;
  --sp-6:32px;
  --sp-7:48px;
  --sp-8:72px;
}

/* --- reset -------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  -webkit-font-smoothing:antialiased;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + var(--sp-5));
}
html.nav-open{overflow:hidden}
body{
  position:relative;
  min-height:100vh;
  overflow-x:clip;
  line-height:1.5;
  background:var(--bg);
  color:var(--text);
}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
svg{display:block}
img{max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}

/* --- a11y --------------------------------------------------------------- */
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:3px;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* --- ambient layers ----------------------------------------------------- */
.grain{
  position:fixed;inset:0;width:100%;height:100%;
  opacity:.04;pointer-events:none;z-index:0;mix-blend-mode:multiply;
}

/* --- typography --------------------------------------------------------- */
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{font-weight:900;font-size:62px;line-height:1.08;letter-spacing:-.03em}
h2{font-weight:800;font-size:clamp(26px,2.8vw,36px);line-height:1.2;letter-spacing:-.02em}
h3{font-weight:800;font-size:20px;line-height:1.35;letter-spacing:-.01em}
h4{font-weight:700;font-size:15px;line-height:1.4}
p{font-size:15.5px;line-height:1.75}
strong{font-weight:700;color:var(--text)}
small{font-size:13px;color:var(--text-muted)}

.mono,.num-mono{font-family:var(--font-mono)}
.muted{color:var(--text-muted)}
.no-break{white-space:nowrap}

/* CJK-aware wrapping: never break inside a short keyword on desktop,
   but allow normal wrapping on narrow screens. */
@media (max-width:640px){
  .no-break{white-space:normal}
}

code{
  font-family:var(--font-mono);
  font-size:.9em;
  background:var(--bg-panel-2);
  border:1px solid var(--border);
  border-radius:6px;
  padding:1px 5px;
  overflow-wrap:anywhere;
  word-break:break-word;
}
pre{
  max-width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-sm);
  padding:14px 16px;
  box-shadow:var(--hl-edge);
}
pre code{background:none;border:0;padding:0;overflow-wrap:normal;white-space:pre}

/* --- layout primitives -------------------------------------------------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.sec{padding-top:var(--sp-8);padding-bottom:var(--sp-8)}
.sec-tight{padding-top:var(--sp-7);padding-bottom:var(--sp-7)}
.sec-head{max-width:760px;margin-bottom:var(--sp-6)}
.sec-head.center{margin-inline:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;color:var(--accent);
}
.sec-lede{margin-top:12px;font-size:16.5px;line-height:1.7;color:var(--text-muted)}

/* --- buttons ------------------------------------------------------------ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:8px;height:46px;padding:0 26px;
  border-radius:var(--r-sm);
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease;
}
.btn svg{width:16px;height:16px;flex:none}
.btn-primary{
  color:var(--white);
  background:linear-gradient(180deg,var(--accent) 0%,var(--accent-dark) 100%);
  box-shadow:0 12px 26px -10px rgba(var(--accent-rgb),.55),inset 0 1px 0 rgba(var(--hl-rgb),.22);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 34px -12px rgba(var(--accent-rgb),.62),inset 0 1px 0 rgba(var(--hl-rgb),.22)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  color:var(--accent);
  border:1.5px solid var(--accent);
  background:rgba(var(--hl-rgb),.4);
}
.btn-ghost:hover{background:rgba(var(--accent-rgb),.08)}
.btn-sm{height:38px;padding:0 18px;font-size:14px}
.btn-lg{height:52px;padding:0 32px;font-size:16px}
.btn-block{width:100%}
.btn[disabled],.btn.is-disabled{opacity:.5;pointer-events:none}

/* --- header ------------------------------------------------------------- */
.site-header{
  position:relative;z-index:5;
  height:var(--header-h);
  border-bottom:1px solid var(--border);
  background:rgba(var(--hl-rgb),.35);
}
.nav-row{height:var(--header-h);display:flex;align-items:center;gap:32px}
.brand{display:flex;align-items:center;gap:10px;margin-right:8px;flex:none}
.brand-logo{width:30px;height:30px;border-radius:9px;box-shadow:var(--shadow-soft);flex:none}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;white-space:nowrap}
.brand-zh{font-size:12.5px;font-weight:500;color:var(--text-muted);white-space:nowrap}

.nav{display:flex;align-items:center;flex:1}
.nav-main{display:flex;align-items:center;gap:28px;flex:1;list-style:none;margin:0;padding:0}
.nav-main li{display:flex}
.nav-main a{
  display:inline-flex;align-items:center;min-height:24px;
  font-size:14.5px;font-weight:500;color:var(--text-muted);letter-spacing:.005em;
}
.nav-main a:hover{color:var(--text)}
.nav-main a[data-active]{color:var(--text);font-weight:700}

.nav-tools{display:flex;align-items:center;gap:18px;margin-left:auto;flex:none}
.lang-switch{position:relative}
.lang-btn{
  display:inline-flex;align-items:center;gap:6px;
  min-height:36px;padding:0 10px;
  border:1px solid transparent;border-radius:var(--r-sm);
  font-size:13.5px;font-weight:500;color:var(--text-muted);
}
.lang-btn:hover{color:var(--text);border-color:var(--border);background:var(--bg-panel)}
.lang-btn svg{width:12px;height:12px;flex:none}
.lang-menu{
  position:absolute;top:calc(100% + 8px);right:0;z-index:12;
  min-width:176px;padding:6px;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-soft);
}
.lang-menu[hidden]{display:none}
.lang-menu a{
  display:flex;align-items:center;width:100%;min-height:38px;padding:0 10px;
  border-radius:var(--r-sm);font-size:13.5px;color:var(--text);
}
.lang-menu a:hover{background:var(--bg-panel-2)}
.lang-menu a[aria-current="true"]{color:var(--accent);font-weight:700}

.btn-login{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 16px;
  border:1.5px solid var(--accent);border-radius:var(--r-sm);
  color:var(--accent);font-size:14px;font-weight:700;
  background:var(--bg-panel);white-space:nowrap;
}
.btn-login:hover{background:rgba(var(--accent-rgb),.08)}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  min-width:44px;min-height:44px;
  border:1px solid var(--border);border-radius:var(--r-sm);
  background:var(--bg-panel);color:var(--text);
}
.nav-toggle svg{width:20px;height:20px;flex:none}

.nav-drawer{display:none}
.nav-veil{display:none}

/* --- footer ------------------------------------------------------------- */
.site-footer{
  margin-top:var(--sp-8);
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,rgba(var(--hl-rgb),.55) 0%,rgba(var(--panel-rgb),.7) 100%);
}
.foot-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.5fr) minmax(0,1fr);
  gap:var(--sp-6);
  padding-top:var(--sp-7);
  padding-bottom:var(--sp-6);
}
.foot-logo{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.foot-brand p{font-size:14px;line-height:1.7;color:var(--text-muted);max-width:420px}
.foot-facts{margin-top:12px;display:flex;flex-wrap:wrap;gap:8px}
.foot-col h3{
  font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--text-muted);margin-bottom:var(--sp-3);
}
.foot-col ul{display:flex;flex-direction:column;gap:2px}
.foot-col li{min-width:0}
.foot-col a{
  display:inline-flex;align-items:center;min-height:28px;
  font-size:14px;color:var(--text-muted);
}
.foot-col a:hover{color:var(--accent)}
.foot-tags{display:flex;flex-wrap:wrap;gap:8px}
.foot-tags a{
  display:inline-flex;align-items:center;
  max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  min-height:26px;padding:0 10px;
  border:1px solid var(--border);border-radius:var(--r-pill);
  background:var(--bg-panel);font-size:12.5px;color:var(--text-muted);
}
.foot-tags a:hover{border-color:var(--accent);color:var(--accent)}
.foot-bottom{
  display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between;
  border-top:1px solid var(--border);
  padding-top:18px;padding-bottom:var(--sp-6);
  font-size:13px;color:var(--text-muted);
}
.foot-legal{display:flex;flex-wrap:wrap;gap:6px 18px}
.foot-legal a{display:inline-flex;align-items:center;min-height:24px}
.foot-legal a:hover{color:var(--accent)}

/* --- reveal (visibility never depends on JS) ---------------------------- */
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
}

/* --- facts / counters --------------------------------------------------- */
.stat-num{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:900;
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  min-width:4.6ch;
  letter-spacing:-.02em;
}

/* --- dynamic line data mount (servers.js) ------------------------------- */
#server-status{
  position:static;
  display:block;
  overflow:hidden;
  max-width:100%;
  margin-top:var(--sp-5);
  margin-bottom:var(--sp-5);
}
#server-status *{max-width:100%;min-width:0}

/* --- overflow guards ---------------------------------------------------- */
.tilt-soft{transform:rotate(-.45deg)}
.deco-layer{position:relative;overflow-x:clip}
@media (max-width:640px){
  .tilt-soft,.tilt-soft *{transform:none !important}
}

/* --- responsive --------------------------------------------------------- */
@media (max-width:1100px){
  h1{font-size:48px}
  .nav-main{gap:18px}
  .foot-grid{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1.2fr)}
}

@media (max-width:900px){
  .nav,.nav-main{display:none}
  .lang-switch{display:none}
  .nav-toggle{display:inline-flex}
  .nav-tools{margin-left:auto;gap:12px}
  .nav-drawer{
    position:absolute;top:100%;left:0;right:0;z-index:9;
    display:none;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:0 28px 56px -24px rgba(var(--text-rgb),.45);
    max-height:calc(100dvh - var(--header-h) - var(--notice-h));
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .nav-drawer.is-open{display:block}
  .nav-drawer ul{list-style:none;margin:0;padding:6px var(--gutter) 0}
  .nav-drawer a{
    display:flex;align-items:center;width:100%;min-height:48px;
    padding:10px 0;
    border-bottom:1px solid var(--border);
    font-size:15px;font-weight:600;color:var(--text);
  }
  .nav-drawer a:hover,.nav-drawer a[data-active]{color:var(--accent)}
  .drawer-lang{padding:14px var(--gutter) 20px}
  .drawer-lang h2{
    font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
    color:var(--text-muted);margin-bottom:4px;
  }
  .drawer-lang a{border-bottom:0;font-weight:500;font-size:14px;color:var(--text-muted)}
  .drawer-lang a[aria-current="true"]{color:var(--accent);font-weight:700}
  .nav-veil{
    position:fixed;inset:0;z-index:8;
    background:rgba(var(--text-rgb),.5);
    border:0;cursor:pointer;
  }
  .nav-veil.is-open{display:block}
}

@media (max-width:768px){
  h1{font-size:34px}
  .sec{padding-top:var(--sp-7);padding-bottom:var(--sp-7)}
  .sec-lede{font-size:15.5px}
  .foot-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:var(--sp-5)}
}

@media (max-width:640px){
  .brand-en{font-size:17px}
  .btn{height:44px;padding:0 20px}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .foot-bottom{flex-direction:column;align-items:flex-start}
}

/* 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 */