/* ============================================================
   CARACTER — 车格
   black canvas · hairlines · one ink-green "available" signal
   ============================================================ */

:root{
  /* canvas / surface */
  --ink-000:#000000;
  --ink-050:#0B0C0D;
  --ink-100:#17191B;
  --ink-200:#2A2D30;

  /* text */
  --paper-000:#F4F4F1;
  --paper-100:#D6D8D6;
  --paper-200:#9A9EA1;
  --paper-300:#6A6E71;

  /* signal — ink green, only the live/available thing gets it */
  --signal:#2E6B54;
  --signal-bright:#5AA87F;
  --signal-deep:#16382B;

  /* inverted card */
  --document-bg:#EFEFEC;
  --document-text:#141516;
  --document-muted:#6B6B66;
  --document-rule:#D6D6D1;

  /* type — all sans */
  --font-display:"Archivo","Noto Sans SC",sans-serif;
  --font-sans:"Noto Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono",monospace;

  /* layout */
  --max:1360px;
  --margin:64px;
  --gutter:32px;
  --section-y:160px;
}

*{box-sizing:border-box;}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--ink-000);
  color:var(--paper-100);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2{margin:0;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;height:auto;}

:focus-visible{
  outline:1px solid var(--signal-bright);
  outline-offset:3px;
}

.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  background:var(--paper-000);
  color:var(--ink-000);
  padding:12px 16px;
  z-index:100;
}
.skip-link:focus{left:16px;top:16px;}

/* ---------- layout primitives ---------- */

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

.section{
  padding-block:var(--section-y);
  border-top:1px solid var(--ink-100);
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:var(--gutter);
}

.col-side{grid-column:1 / 4;}
.col-main{grid-column:4 / 13;}

.label{
  font-size:13px;
  line-height:1.4;
  letter-spacing:.12em;
  color:var(--paper-300);
}

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

/* ---------- type scale ---------- */

.display-2{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:clamp(1.6rem,2.4vw,2.15rem);
  line-height:1.35;
  letter-spacing:.02em;
  color:var(--paper-000);
  margin-bottom:28px;
}

.body-lg{
  font-size:clamp(1.05rem,1.2vw,1.15rem);
  line-height:1.85;
  color:var(--paper-100);
  max-width:44ch;
  margin-bottom:18px;
}

.body{
  font-size:16px;
  line-height:1.85;
  color:var(--paper-200);
  max-width:46ch;
}

/* ---------- topbar ---------- */

.topbar{
  position:relative;
  z-index:50;
  border-bottom:1px solid var(--ink-100);
}

.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  padding-block:22px;
}

.brand{display:flex;}
.brand-logo{
  display:block;
  height:15px;
  width:auto;
}

.nav{
  display:flex;
  align-items:center;
  gap:32px;
  font-size:14px;
  color:var(--paper-200);
}
.nav > a,
.nav-trigger{
  padding-block:4px;
  transition:color .18s ease;
}
.nav > a:hover,
.nav-tools:hover .nav-trigger,
.nav-tools:focus-within .nav-trigger,
.nav-tools.is-open .nav-trigger{color:var(--paper-000);}

/* tools dropdown */

.nav-tools{position:relative;}

.nav-trigger{
  background:none;
  border:0;
  padding:4px 0;
  cursor:pointer;
  letter-spacing:inherit;
}

.nav-menu{
  position:absolute;
  top:100%;
  left:50%;
  transform:translateX(-50%) translateY(-4px);
  padding-top:14px;
  opacity:0;
  visibility:hidden;
  transition:opacity .18s ease, transform .18s ease, visibility .18s;
}
.nav-tools:hover .nav-menu,
.nav-tools:focus-within .nav-menu,
.nav-tools.is-open .nav-menu{
  opacity:1;
  visibility:visible;
  transform:translateX(-50%) translateY(0);
}

.nav-menu-panel{
  min-width:270px;
  background:var(--ink-050);
  border:1px solid var(--ink-200);
}

.menu-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:14px 18px;
  font-size:14px;
  color:var(--paper-100);
  transition:background .18s ease;
}
.menu-item:hover{background:var(--ink-100);}
.menu-label{white-space:nowrap;}

/* ---------- hero ---------- */

.hero{
  padding-top:clamp(48px,7vw,96px);
  padding-bottom:var(--section-y);
}

.hero-logo{
  display:block;
  width:min(86%,920px);
  height:auto;
  animation:reveal 1.15s cubic-bezier(.22,.61,.36,1) .15s both;
}

@keyframes reveal{
  from{clip-path:inset(0 100% 0 0);}
  to{clip-path:inset(0 0 0 0);}
}

.hero-title{
  margin-top:clamp(36px,5vw,64px);
  display:flex;
  flex-direction:column;
  gap:14px;
}

.hero-title-cn{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:clamp(2.5rem,6vw,4.6rem);
  line-height:1;
  letter-spacing:.12em;
  color:var(--paper-000);
}

.hero-title-sub{
  font-family:var(--font-sans);
  font-weight:400;
  font-size:clamp(1.15rem,2.1vw,1.7rem);
  line-height:1.5;
  letter-spacing:.06em;
  color:var(--paper-100);
}

.hero-title-en{
  margin-top:20px;
  font-family:var(--font-display);
  font-stretch:118%;
  font-weight:400;
  font-size:clamp(.8rem,1.1vw,.95rem);
  letter-spacing:.16em;
  color:var(--paper-300);
}

/* apps — merged into first screen */

.apps{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  margin-top:clamp(52px,7vw,96px);
  border-top:1px solid var(--ink-100);
}

.app{
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  gap:16px;
  padding:clamp(36px,4.5vw,60px) 20px;
  border-bottom:1px solid var(--ink-100);
}
.app + .app{border-left:1px solid var(--ink-100);}

.app-icon{
  width:clamp(56px,6vw,84px);
  height:auto;
  filter:invert(1);
}

.app-name{
  font-size:16px;
  color:var(--paper-100);
}

/* ---------- inverted card ---------- */

.idcard{
  padding-block:var(--section-y);
  background:var(--document-bg);
  color:var(--document-text);
}

.doc-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:24px;
  padding-bottom:20px;
  border-bottom:1px solid var(--document-text);
}

.doc-label{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:clamp(1.3rem,1.9vw,1.7rem);
  letter-spacing:.14em;
}

.doc-no{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--document-muted);
}

.card-spec{
  margin:0;
  max-width:820px;
}

.spec-row{
  display:grid;
  grid-template-columns:minmax(96px,180px) 1fr;
  gap:24px;
  padding-block:16px;
  border-bottom:1px solid var(--document-rule);
}

.spec-row dt{
  color:var(--document-muted);
  font-size:14px;
}
.spec-row dd{
  margin:0;
  color:var(--document-text);
  font-size:15px;
}
.spec-row dd.mono{font-size:14.5px;}

.doc-note{
  margin-top:28px;
  font-size:13px;
  color:var(--document-muted);
}

/* ---------- feature list ---------- */

.feature-list{
  margin-top:36px;
  border-top:1px solid var(--ink-100);
}

.feature-list li{
  display:grid;
  grid-template-columns:minmax(72px,120px) 1fr;
  gap:24px;
  align-items:baseline;
  padding-block:20px;
  border-bottom:1px solid var(--ink-100);
}

.feature-key{
  font-size:14px;
  letter-spacing:.08em;
  color:var(--paper-000);
}
.feature-text{
  font-size:15px;
  color:var(--paper-200);
}

/* ---------- status ---------- */

.status{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:13px;
  letter-spacing:.02em;
  white-space:nowrap;
}
.dot{
  width:7px;
  height:7px;
  border-radius:50%;
  display:inline-block;
}
.status-live{color:var(--signal-bright);}
.status-live .dot{
  background:var(--signal-bright);
  box-shadow:0 0 0 3px rgba(90,168,127,.16);
}
.status-soon{color:var(--paper-300);}
.status-soon .dot{
  background:transparent;
  border:1px solid var(--paper-300);
}

/* ---------- events ---------- */

.event-title{
  display:flex;
  align-items:center;
  gap:16px;
}

.event-icon{
  width:clamp(26px,2.6vw,34px);
  height:auto;
  filter:invert(1);
  opacity:.9;
  flex:none;
}

.join{
  display:flex;
  align-items:center;
  gap:28px;
  margin-top:40px;
  flex-wrap:wrap;
}

.qr-frame{
  display:inline-grid;
  place-items:center;
  padding:12px;
  border:1px solid var(--ink-200);
  background:var(--ink-050);
}
.qr-frame img{
  display:block;
  width:180px;
  height:180px;
}

.join-note{
  font-size:16px;
  line-height:1.85;
  color:var(--paper-100);
  max-width:20ch;
}

/* ---------- footer ---------- */

.footer{
  border-top:1px solid var(--ink-100);
}

.footer-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding-block:40px;
}

.footer-logo{
  display:block;
  height:12px;
  width:auto;
  opacity:.75;
}

.footer-meta{
  font-size:13px;
  color:var(--paper-300);
}

/* ---------- responsive ---------- */

@media (max-width:1024px){
  :root{
    --margin:40px;
    --gutter:24px;
    --section-y:112px;
  }
}

@media (max-width:760px){
  :root{
    --margin:20px;
    --gutter:16px;
    --section-y:72px;
  }

  .topbar-inner{
    flex-direction:column;
    align-items:flex-start;
    gap:14px;
    padding-block:18px;
  }
  .nav{
    gap:28px;
    font-size:15px;
    width:100%;
  }
  .nav > a,
  .nav-trigger{
    padding-block:8px;
  }

  .brand-logo{height:13px;}

  /* menu anchor to the left on mobile so it never overflows */
  .nav-menu{
    left:0;
    transform:translateX(0) translateY(-4px);
  }
  .nav-tools:hover .nav-menu,
  .nav-tools:focus-within .nav-menu,
  .nav-tools.is-open .nav-menu{transform:translateX(0) translateY(0);}
  .nav-menu-panel{min-width:260px;}
  .menu-item{padding:16px 18px;}

  .grid-12{grid-template-columns:1fr;gap:0;}
  .col-side,.col-main{grid-column:1 / -1;}
  .col-side{margin-bottom:16px;}

  .hero{padding-top:44px;}
  .hero-logo{width:100%;}
  .hero-title{margin-top:32px;gap:12px;}
  .hero-title-en{letter-spacing:.12em;}

  .display-2{margin-bottom:20px;}

  .apps{grid-template-columns:1fr;margin-top:44px;}
  .app{
    flex-direction:row;
    align-items:center;
    text-align:left;
    gap:18px;
    padding:22px 4px;
  }
  .app + .app{
    border-left:0;
    border-top:1px solid var(--ink-100);
  }
  .app-icon{width:44px;flex:none;}
  .app-name{flex:1 1 auto;}
  .app .status{margin-left:auto;}

  .spec-row{
    grid-template-columns:1fr;
    gap:6px;
  }

  .feature-list li{
    grid-template-columns:1fr;
    gap:6px;
  }

  .join{
    flex-direction:column;
    align-items:flex-start;
    gap:20px;
    margin-top:32px;
  }
  .join-note{max-width:100%;}

  .qr-frame img{width:160px;height:160px;}

  .footer-inner{
    flex-direction:column;
    align-items:flex-start;
    gap:12px;
  }
}

@media (max-width:380px){
  .hero-title-cn{letter-spacing:.08em;}
  .nav{gap:22px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .hero-logo{animation:none;clip-path:none;}
  .nav-menu,
  .menu-item,
  .nav > a,
  .nav-trigger{transition:none;}
}