/* =========================================================================
   VPNAJ · base.css
   "Morning route workspace" — design tokens, reset, typography, page shell,
   site header (with mobile drawer), site footer, reveal transitions.
   Every colour / radius / shadow is declared once in :root and referenced
   by name everywhere else. No literal colours below the token block.
   ========================================================================= */

:root{
  /* ── surfaces ─────────────────────────────────────────────────────── */
  --bg:#E4EEF7;
  --bg-mid:#EDF4FB;
  --bg-panel:#F8FBFF;
  --bg-panel-2:#D5E5F1;
  --border:#C2D5E4;
  --border-soft:rgba(194,213,228,.72);
  --inset-a:#EAF3FA;
  --inset-b:#DCEAF5;

  /* ── ink ──────────────────────────────────────────────────────────── */
  --text:#14202E;
  --text-muted:#55677A;
  --ink-800:#1D2A38;
  --ink-900:#14202E;
  --ink-60:rgba(20,32,46,.60);
  --ink-45:rgba(20,32,46,.45);
  --ink-25:rgba(20,32,46,.25);
  --ink-16:rgba(20,32,46,.16);
  --ink-14:rgba(20,32,46,.14);
  --ink-07:rgba(20,32,46,.07);

  /* ── accent ───────────────────────────────────────────────────────── */
  --accent:#7A33D6;
  --accent-dark:#591FA6;
  --accent-soft:#C9AEF6;
  --accent-06:rgba(122,51,214,.06);
  --accent-08:rgba(122,51,214,.08);
  --accent-12:rgba(122,51,214,.12);
  --accent-20:rgba(122,51,214,.20);
  --accent-30:rgba(122,51,214,.30);
  --accent-45:rgba(122,51,214,.45);

  /* ── semantics ────────────────────────────────────────────────────── */
  --ok:#0F7A5A;
  --ok-08:rgba(15,122,90,.08);
  --ok-18:rgba(15,122,90,.18);
  --warn:#A8620A;
  --warn-08:rgba(168,98,10,.08);
  --warn-18:rgba(168,98,10,.18);
  --danger:#B93A32;
  --danger-08:rgba(185,58,50,.08);
  --danger-18:rgba(185,58,50,.18);

  /* ── aurora (window right pane + candy cards only) ─────────────────── */
  --aur-cyan:#8FD8F2;
  --aur-lav:#C9BDF5;
  --aur-pink:#F6C6DA;
  --aur-cream:#FFE9BE;
  --aur-cyan-0:rgba(143,216,242,0);
  --aur-pink-0:rgba(246,198,218,0);
  --aur-cream-0:rgba(255,233,190,0);
  --halo-cyan:rgba(143,216,242,.34);
  --halo-pink:rgba(246,198,218,.36);
  --halo-lav:rgba(201,189,245,.30);

  /* ── white steps ──────────────────────────────────────────────────── */
  --snow:#FFFFFF;
  --snow-92:rgba(255,255,255,.92);
  --snow-75:rgba(255,255,255,.75);
  --snow-70:rgba(255,255,255,.72);
  --snow-55:rgba(255,255,255,.55);

  /* ── window chrome dots ───────────────────────────────────────────── */
  --dot-r:#E4796F;
  --dot-y:#EEC05B;
  --dot-g:#6FC08C;

  /* ── flag fills (inline SVG only) ─────────────────────────────────── */
  --flag-red:#C8453C;
  --flag-red-deep:#C0272D;
  --flag-blue:#2C3E7B;
  --flag-gold:#E3B34A;
  --flag-ink:#1B1B1B;
  --flag-white:#FFFFFF;

  /* ── type ─────────────────────────────────────────────────────────── */
  --font-display:Georgia, "Times New Roman", "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-body:Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* ── geometry ─────────────────────────────────────────────────────── */
  --shell:1180px;
  --gutter:clamp(16px,4.2vw,32px);
  --head-h:66px;
  --r-window:26px;
  --r-card:20px;
  --r-panel:16px;
  --r-tile:12px;
  --r-chip:8px;
  --r-pill:999px;
  --sp-1:4px;
  --sp-2:8px;
  --sp-3:12px;
  --sp-4:16px;
  --sp-5:24px;
  --sp-6:32px;
  --sp-7:48px;
  --sp-8:64px;
  --sec-y:clamp(48px,7vw,96px);

  /* ── elevation ────────────────────────────────────────────────────── */
  --lift-window:
    inset 0 0 0 1px var(--snow-92),
    0 0 0 1px var(--border),
    0 24px 48px -26px rgba(20,32,46,.32),
    0 56px 112px -44px var(--accent-45);
  --lift-pane:0 10px 22px -16px rgba(20,32,46,.28);
  --lift-pill:0 12px 24px -12px rgba(20,32,46,.52), inset 0 1px 0 rgba(255,255,255,.12);
  --lift-btn:0 14px 28px -14px rgba(20,32,46,. 0);
  --lift-soft:0 12px 26px -18px rgba(20,32,46,.45);
  --lift-card:0 20px 40px -30px var(--accent-45), inset 0 1px 0 var(--snow-92);
}

/* =========================================================================
   Reset
   ========================================================================= */

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--head-h) + 16px);
}

body{
  margin:0;
  min-height:100svh;
  overflow-x:clip;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  color:var(--text);
  background-color:var(--bg);
  background-image:linear-gradient(180deg,var(--bg) 0%,var(--bg-mid) 46%,var(--bg-panel) 100%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body,button,input,select,textarea{font-family:var(--font-body)}

a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0}
li{list-style:none}
img,svg,video{display:block}
img{max-width:100%;height:auto}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
::selection{background:var(--accent-12);color:var(--text)}

/* Long unbreakable strings (subscription URLs, package file names) must never
   push the layout wider than the viewport. */
code,kbd,samp{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
  word-break:break-word;
}
pre{
  max-width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  padding:var(--sp-4);
  border-radius:var(--r-tile);
  background:var(--bg-panel-2);
  box-shadow:inset 0 0 0 1px var(--border);
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
}
pre code{overflow-wrap:normal;word-break:normal}

/* =========================================================================
   Typography
   ========================================================================= */

h1,h2,h3{font-family:var(--font-display);font-weight:400;color:var(--text)}
h1{font-size:clamp(38px,5vw,64px);line-height:1.08;letter-spacing:-.02em}
h2{font-size:clamp(26px,3.2vw,40px);line-height:1.16;letter-spacing:-.02em}
h3{font-size:clamp(19px,2vw,23px);line-height:1.28;letter-spacing:-.01em}
h4{font-family:var(--font-body);font-size:15px;font-weight:600;line-height:1.4}

p{color:var(--text-muted)}
strong{color:var(--text);font-weight:600}

.lede{
  max-width:640px;
  margin:var(--sp-4) auto 0;
  font-size:16px;
  line-height:1.75;
  color:var(--text-muted);
}
.lede strong{color:var(--text);font-weight:600}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:var(--sp-2);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-muted);
}
.kicker::before{
  content:"";
  width:14px;
  height:1px;
  flex:none;
  background:var(--accent);
}

.eyebrow{
  display:inline-block;
  margin:0 0 var(--sp-4);
  padding:5px 13px;
  border-radius:var(--r-pill);
  border:1px solid var(--border);
  background:var(--snow-55);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--text-muted);
  box-shadow:inset 0 1px 0 var(--snow-92);
}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--text-muted)}

/* Chinese keyword guard: only 2–4 hanzi may sit inside .no-break. */
.no-break{white-space:nowrap}

/* =========================================================================
   Shell
   ========================================================================= */

.wrap{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.sec{padding-block:var(--sec-y)}

.sec-head{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:var(--sp-3);
  text-align:center;
  margin-bottom:var(--sp-7);
}
.sec-head .kicker{justify-content:center}
.sec-head p{max-width:640px;font-size:15.5px}

/* Status grid injected by the shared server component: keep it in normal flow,
   never absolutely positioned, never pulled with negative margins. */
#server-status{
  position:relative;
  display:block;
  width:100%;
  max-width:100%;
  overflow:hidden;
  margin-block:var(--sp-6);
}
#server-status > *{max-width:100%}

/* =========================================================================
   Buttons
   ========================================================================= */

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  height:52px;
  padding-inline:28px;
  border:0;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease, color .18s ease;
}
.btn .arrow{flex:none}

.btn-primary{
  color:var(--snow);
  background:linear-gradient(180deg,var(--ink-800),var(--ink-900));
  box-shadow:0 14px 28px -14px rgba(20,32,46,.50), 0 22px 44px -24px var(--accent-45);
}
.btn-primary .arrow{color:var(--accent-soft)}
.btn-primary:hover{
  transform:translateY(-1px);
  box-shadow:0 18px 34px -14px rgba(20,32,46,.55),  0 28px 54px -24px var(--accent-45);
}

.btn-ghost{
  color:var(--text);
  background:var(--snow-70);
  border:1px solid var(--border);
  box-shadow:inset 0 1px 0 var(--snow-92), 0 12px 22px -18px rgba(20,32,46,.5);
}
.btn-ghost:hover{border-color:var(--accent-30);background:var(--snow)}

.btn-accent{
  color:var(--snow);
  background:linear-gradient(180deg,var(--accent),var(--accent-dark));
  box-shadow:0 16px 30px -16px var(--accent-45), inset 0 1px 0 var(--snow-55);
}
.btn-accent:hover{transform:translateY(-1px)}

.btn-quiet{
  height:auto;
  padding:0;
  border-radius:0;
  color:var(--accent-dark);
  background:none;
  box-shadow:none;
  font-size:14px;
}
.btn-quiet:hover{color:var(--accent)}

.btn-sm{height:42px;padding-inline:18px;font-size:13.5px}
.btn-block{width:100%}

.cta-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:var(--sp-3);
  margin-top:26px;
}
.cta-row--start{justify-content:flex-start}

/* =========================================================================
   Focus, skip link, helper classes
   ========================================================================= */

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:10px 16px;
  border-radius:0 0 var(--r-tile) 0;
  background:var(--bg-panel);
  color:var(--text);
  font-size:13px;
  box-shadow:inset 0 0 0 1px var(--border);
}
.skip-link:focus{left:0}

.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;
}

/* =========================================================================
   Site header
   ========================================================================= */

.site-head{
  position:relative;
  z-index:60;
}

.head-inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:var(--head-h);
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:26px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-width:0;
}
.brand-logo{
  width:30px;
  height:30px;
  flex:none;
  object-fit:contain;
}
.brand-en{
  font-size:16px;
  font-weight:700;
  letter-spacing:.02em;
  white-space:nowrap;
}
.brand-zh{
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.06em;
  color:var(--text-muted);
  white-space:nowrap;
}

.nav-main{
  display:flex;
  justify-content:center;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:26px;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-list a{
  display:inline-flex;
  align-items:center;
  min-height:32px;
  padding-block:6px;
  font-size:13.5px;
  font-weight:500;
  letter-spacing:.01em;
  color:var(--text-muted);
  white-space:nowrap;
  transition:color .18s ease;
}
.nav-list a:hover{color:var(--text)}
.nav-list a.is-active{color:var(--text);font-weight:600}

.head-tools{
  display:flex;
  align-items:center;
  gap:14px;
  margin-left:auto;
  justify-self:end;
}

.lang-wrap{position:relative}
.lang-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  width:auto;
  min-height:36px;
  padding:0 10px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  background:none;
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--text-muted);
  cursor:pointer;
  white-space:nowrap;
  transition:color .18s ease, border-color .18s ease, background .18s ease;
}
.lang-btn:hover{color:var(--text);border-color:var(--border);background:var(--snow-55)}
.lang-btn svg{flex:none;opacity:.72}
.lang-btn .lang-label,
.lang-btn .lang-short{white-space:nowrap}
.lang-btn .lang-short{display:none}

.lang-menu{
  position:absolute;
  right:0;
  top:calc(100% + 8px);
  min-width:max-content;
  padding:6px;
  border-radius:var(--r-panel);
  background:var(--bg-panel);
  box-shadow:inset 0 0 0 1px var(--border), 0 18px 34px -22px rgba(20,32,46,.6);
  display:none;
  z-index:120;
}
.lang-menu.is-open{display:block}
.lang-menu a{
  display:flex;
  align-items:center;
  min-height:38px;
  padding:6px 12px;
  border-radius:var(--r-chip);
  font-size:13px;
  color:var(--text-muted);
  white-space:nowrap;
}
.lang-menu a:hover{background:var(--accent-06);color:var(--text)}
.lang-menu a[aria-current="true"]{color:var(--accent-dark);font-weight:600}

.login{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:36px;
  padding-inline:18px;
  border-radius:var(--r-pill);
  border:1px solid var(--border);
  background:var(--snow-70);
  font-size:13px;
  font-weight:600;
  color:var(--text);
  white-space:nowrap;
  box-shadow:inset 0 1px 0 var(--snow-92), 0 8px 16px -12px rgba(20,32,46,.55);
  transition:border-color .18s ease, background .18s ease;
}
.login:hover{border-color:var(--accent-30);background:var(--snow)}

.burger{
  display:none;
  align-items:center;
  justify-content:center;
  min-width:44px;
  min-height:44px;
  padding:0;
  border:1px solid var(--border);
  border-radius:var(--r-tile);
  background:var(--snow-70);
  color:var(--text);
  cursor:pointer;
  box-shadow:inset 0 1px 0 var(--snow-92);
}
.burger svg{width:18px;height:18px;flex:none}

/* Mobile drawer — sibling of brand / nav / tools, never nested inside them. */
.nav-drawer{display:none}

/* =========================================================================
   Site footer
   ========================================================================= */

.site-foot{
  position:relative;
  margin-top:clamp(40px,6vw,80px);
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,var(--bg-panel) 0%,var(--bg-panel-2) 100%);
}
.foot-inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter) 22px;
}
.foot-top{
  display:grid;
  grid-template-columns:minmax(230px,1fr) 2.1fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.foot-brand{display:flex;flex-direction:column;gap:var(--sp-3);min-width:0}
.foot-logo{display:inline-flex;align-items:center;gap:9px}
.foot-logo img{width:28px;height:28px;flex:none}
.foot-logo span{font-size:16px;font-weight:700;letter-spacing:.02em}
.foot-tagline{
  font-size:13px;
  line-height:1.8;
  color:var(--text-muted);
  max-width:34ch;
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,36px);
}
.foot-col{min-width:0}
.foot-col-title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-muted);
  margin-bottom:var(--sp-3);
}
.foot-links{display:flex;flex-direction:column;gap:2px}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:32px;
  font-size:13.5px;
  color:var(--text);
  opacity:.78;
  transition:opacity .18s ease, color .18s ease;
}
.foot-links a:hover{opacity:1;color:var(--accent-dark)}

.foot-hot{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-top:var(--sp-4);
}
.foot-hot a{
  display:inline-block;
  max-width:100%;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  padding:5px 10px;
  border-radius:var(--r-pill);
  border:1px solid var(--border);
  background:var(--snow-55);
  font-size:12px;
  color:var(--text-muted);
  transition:border-color .18s ease, color .18s ease;
}
.foot-hot a:hover{border-color:var(--accent-30);color:var(--accent-dark)}

.foot-lang{
  display:flex;
  flex-wrap:wrap;
  gap:6px 14px;
  margin-top:var(--sp-4);
}
.foot-lang a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  font-size:12.5px;
  color:var(--text-muted);
}
.foot-lang a[aria-current="true"]{color:var(--text);font-weight:600}

.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:var(--sp-3);
  margin-top:clamp(28px,4vw,44px);
  padding-top:var(--sp-4);
  border-top:1px solid var(--border-soft);
}
.foot-copy{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.02em;
  color:var(--text-muted);
}
.foot-legal{
  display:flex;
  flex-wrap:wrap;
  gap:4px 18px;
}
.foot-legal a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  font-size:12.5px;
  color:var(--text-muted);
}
.foot-legal a:hover{color:var(--accent-dark)}

/* =========================================================================
   Reveal (visibility is owned by reveal.js — never hidden by default)
   ========================================================================= */

.reveal{
  transition:opacity .6s ease, transform .6s ease;
}
.reveal.pending{
  opacity:0;
  transform:translateY(16px);
}

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

/* =========================================================================
   Breakpoints
   ========================================================================= */

@media (max-width:1120px){
  .head-inner{gap:18px}
  .nav-list{gap:20px}
  .nav-list a{font-size:13px}
}

@media (max-width:980px){
  :root{--head-h:60px}

  .head-inner{
    grid-template-columns:auto 1fr;
    gap:12px;
    height:var(--head-h);
    padding-block:0;
  }
  .nav-main{display:none}
  .head-tools{margin-left:auto;justify-self:end;gap:8px}
  .burger{display:inline-flex}

  .lang-menu{right:0}

  /* Drawer panel: opaque, scroll-contained, full-row tappable links. */
  .nav-drawer{
    position:fixed;
    left:0;
    right:0;
    top:var(--head-h);
    z-index:110;
    display:none;
    max-height:calc(100dvh - var(--head-h));
    overflow-y:auto;
    overscroll-behavior:contain;
    padding:10px var(--gutter) 26px;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:0 24px 44px -28px rgba(20,32,46,.55);
  }
  .nav-drawer.is-open{display:block}
  .nav-drawer ul{
    display:flex;
    flex-direction:column;
    margin:0;
    padding:0;
    list-style:none;
  }
  .nav-drawer li{min-width:0}
  .nav-drawer a{
    display:flex;
    width:100%;
    align-items:center;
    min-height:48px;
    padding:10px 4px;
    border-bottom:1px solid var(--ink-07);
    font-size:15px;
    color:var(--text);
  }
  .nav-drawer a.is-active{color:var(--accent-dark);font-weight:600}
  .nav-drawer .drawer-label{
    padding:16px 4px 6px;
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.12em;
    text-transform:uppercase;
    color:var(--text-muted);
  }
  .nav-drawer .drawer-langs a{
    min-height:44px;
    font-size:14px;
    color:var(--text-muted);
    border-bottom-style:dashed;
  }
  .nav-drawer .drawer-langs a[aria-current="true"]{color:var(--accent-dark);font-weight:600}

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

html.nav-open{overflow:hidden}

@media (max-width:900px){
  .foot-cols{grid-template-columns:1fr 1fr}
}

@media (max-width:768px){
  h1,.hero h1{font-size:clamp(28px,7.2vw,40px);line-height:1.14}
  h2{font-size:clamp(24px,5.6vw,30px)}
  .lede{font-size:14.5px}
}

@media (max-width:700px){
  .lang-btn .lang-label{display:none}
  .lang-btn .lang-short{display:inline}
  .brand-zh{display:none}
}

@media (max-width:640px){
  /* Narrow screens may break keywords again — a long nowrap run would
     otherwise blow past a 375px viewport. */
  .no-break{white-space:normal}

  .btn{height:48px;padding-inline:22px;font-size:14.5px}
  .btn-sm{height:40px;padding-inline:16px;font-size:13px}

  .foot-cols{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;align-items:flex-start;gap:10px}
}

@media (max-width:400px){
  .login{padding-inline:14px;font-size:12.5px}
  .head-tools{gap:6px}
  .lang-btn{padding-inline:6px}
}

/* 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 */