/* ==========================================================================
   nework.uk — "夜间值守" / editorial + signal plate
   Self-contained: system font stacks only (no external font/CDN requests).
   ========================================================================== */

:root{
  /* surfaces */
  --ink:#0b0c0e;
  --ink-2:#101215;
  --ink-3:#15181c;
  --line:rgba(236,233,227,.10);
  --line-2:rgba(236,233,227,.18);

  /* text */
  --fg:#ece9e3;
  --fg-2:#b9b5ad;
  --fg-3:#8c8880;

  /* accent */
  --accent:#e2542c;
  --accent-soft:rgba(226,84,44,.14);
  --ok:#7ea885;

  /* type */
  --serif:"Iowan Old Style","Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Roboto Mono",monospace;

  /* rhythm */
  --pad:clamp(20px,4.5vw,60px);
  --maxw:1180px;
  --gap:clamp(14px,2vw,22px);
  --r:2px;

  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--fg);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  font-feature-settings:"kern" 1;
  overflow-x:hidden;
}

/* film grain — single tiled SVG turbulence, no image file */
body::after{
  content:"";position:fixed;inset:0;z-index:60;pointer-events:none;opacity:.32;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}
/* soft night glow behind the fold */
body::before{
  content:"";position:fixed;inset:-20% -10% auto;height:112vh;z-index:-1;pointer-events:none;
  background:
    radial-gradient(60% 50% at 78% 12%, rgba(226,84,44,.13), transparent 70%),
    radial-gradient(70% 60% at 8% 0%, rgba(120,140,190,.10), transparent 72%);
}

a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0;font-weight:400;line-height:1.06}
p{margin:0}
ul,dl,figure{margin:0;padding:0;list-style:none}
::selection{background:var(--accent);color:#fff}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:10px 14px;z-index:99}
.skip:focus{left:8px;top:8px}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ===================== topbar ===================== */
.topbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:14px var(--pad);
  background:rgba(11,12,14,.94);
  border-bottom:1px solid var(--line);
}
.brand{font-family:var(--mono);font-size:15px;letter-spacing:-.01em}
.brand span{color:var(--accent)}
.topnav{display:flex;gap:clamp(14px,2.4vw,30px);font-size:14px;color:var(--fg-2)}
.topnav a{position:relative;padding:6px 0;transition:color .2s var(--ease)}
.topnav a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--accent);
  transition:width .28s var(--ease);
}
.topnav a:hover{color:var(--fg)}
.topnav a:hover::after{width:100%}

/* ===================== hero ===================== */
.hero{padding:clamp(40px,7vw,86px) var(--pad) clamp(30px,4vw,50px);max-width:var(--maxw);margin:0 auto}
.hero-grid{
  display:grid;gap:clamp(28px,5vw,64px);align-items:center;
  grid-template-columns:minmax(0,1.28fr) minmax(0,.92fr);
}

.eyebrow{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--fg-3);display:flex;align-items:center;gap:9px;margin-bottom:clamp(16px,2.4vw,26px);
}
.tick{width:7px;height:7px;background:var(--accent);border-radius:50%;box-shadow:0 0 0 4px var(--accent-soft)}

h1{font-size:clamp(2.6rem,7.4vw,5.1rem);letter-spacing:-.02em}
h1 .l1,h1 .l2{display:block}
h1 .l2{font-family:var(--serif)}
h1 em{font-style:italic;color:var(--accent)}
h1 .l3{
  display:block;margin-top:.5em;
  font-family:var(--serif);font-style:italic;font-size:clamp(.9rem,2vw,1.35rem);
  letter-spacing:.02em;color:var(--fg-3);
}
.lede{
  margin:clamp(20px,2.6vw,28px) 0 0;max-width:44ch;
  color:var(--fg-2);font-size:clamp(.98rem,1.6vw,1.06rem);line-height:1.75;
}
.hero-actions{display:flex;align-items:center;gap:clamp(14px,2.4vw,26px);flex-wrap:wrap;margin-top:clamp(24px,3.4vw,36px)}

.btn{
  --mx:50%;--my:50%;
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:13px 20px;min-height:44px;
  border:1px solid var(--line-2);border-radius:var(--r);
  background:
    radial-gradient(140px 140px at var(--mx) var(--my), var(--accent-soft), transparent 70%),
    var(--ink-2);
  font-size:15px;color:var(--fg);
  transition:border-color .25s var(--ease),transform .25s var(--ease),color .25s var(--ease);
  cursor:pointer;
}
.btn:hover{border-color:var(--accent);color:#fff}
.btn .arw{color:var(--accent);font-size:13px}
.link-quiet{
  font-size:14.5px;color:var(--fg-3);border-bottom:1px solid var(--line-2);
  padding-bottom:3px;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.link-quiet:hover{color:var(--fg);border-color:var(--accent)}

/* ---------- signal plate ---------- */
.plate{margin:0}
.signal{width:100%;height:auto;display:block;overflow:visible}
.plate-bg{fill:var(--ink-2)}
.plate-edge{fill:none;stroke:var(--line)}
.grid path{stroke:rgba(236,233,227,.07);stroke-width:1}
.grid .axis{stroke:rgba(236,233,227,.16)}
.rings circle{fill:none;stroke:rgba(226,84,44,.30);stroke-width:1}
.core{fill:var(--accent)}
.plate-labels text{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;
  fill:var(--fg-3);
}
.marks .mark circle{fill:var(--fg-2)}
.marks .mark text{font-family:var(--mono);font-size:10.5px;fill:var(--fg-3);letter-spacing:.06em}
.plate-cap{
  display:flex;align-items:center;gap:9px;margin-top:12px;
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--fg-3);
}
.dot{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(126,168,133,.15);flex:0 0 auto}

/* rings breathe — the single ambient motion of the page */
.rings circle{transform-origin:210px 214px;animation:breathe 6.5s var(--ease) infinite}
.rings circle:nth-child(2){animation-delay:.8s}
.rings circle:nth-child(3){animation-delay:1.6s}
@keyframes breathe{0%,100%{opacity:.35;transform:scale(1)}50%{opacity:.9;transform:scale(1.035)}}

/* ---------- stats strip ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;margin-top:clamp(38px,6vw,72px);
  background:var(--line);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.stats>div{background:var(--ink);padding:16px 4px 16px 0}
.stats dt{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg-3)}
.stats dd{margin:6px 0 0;font-size:clamp(1.1rem,2.4vw,1.5rem);font-family:var(--serif)}

/* ===================== sections ===================== */
.services,.ops{padding:clamp(52px,8vw,96px) var(--pad);max-width:var(--maxw);margin:0 auto}
.sec-head{max-width:60ch;margin-bottom:clamp(26px,4vw,44px)}
.kicker{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.sec-head h2,.note h2{font-family:var(--serif);font-size:clamp(1.55rem,4vw,2.5rem);margin:12px 0 0;letter-spacing:-.01em}
.sec-note{margin-top:14px;color:var(--fg-2);font-size:.98rem;max-width:52ch}

/* ---------- service cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:var(--gap)}
.card{
  --mx:50%;--my:0%;
  position:relative;background:var(--ink-2);border:1px solid var(--line);border-radius:var(--r);
  transition:border-color .28s var(--ease),transform .28s var(--ease),background .28s var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;opacity:0;transition:opacity .3s var(--ease);
  background:radial-gradient(220px 160px at var(--mx) var(--my), var(--accent-soft), transparent 72%);
  pointer-events:none;
}
.card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.card:hover::before{opacity:1}
.card a{display:block;padding:20px;min-height:196px;position:relative}
.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px}
.idx{font-family:var(--mono);font-size:11px;color:var(--fg-3);letter-spacing:.12em}
.pill{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--fg-3);
  border:1px solid var(--line);border-radius:100px;padding:3px 9px;
}
.card-name{display:block;font-family:var(--mono);font-size:1.16rem;letter-spacing:-.01em}
.card-name small{color:var(--fg-3);font-size:.72em}
.card-desc{display:block;margin-top:10px;color:var(--fg-2);font-size:.92rem;line-height:1.65;max-width:30ch}
.card-go{
  position:absolute;right:20px;bottom:18px;color:var(--accent);font-size:15px;
  transition:transform .3s var(--ease);
}
.card:hover .card-go{transform:translate(3px,-3px)}

/* ---------- ops rows ---------- */
.rows{border-top:1px solid var(--line)}
.row{
  display:grid;grid-template-columns:130px minmax(0,1fr) 74px 96px;
  align-items:center;gap:clamp(12px,2vw,24px);
  padding:18px 4px;border-bottom:1px solid var(--line);
  transition:background .25s var(--ease),padding .25s var(--ease);
}
.row:hover{background:var(--ink-2);padding-left:12px}
.row-key{font-family:var(--mono);font-size:13px;color:var(--fg);word-break:break-all}
.row-body strong{display:block;font-weight:400;font-size:15.5px}
.row-body small{display:block;color:var(--fg-3);font-size:.86rem;margin-top:3px}
.row-tag{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--accent);
  border:1px solid rgba(226,84,44,.32);border-radius:100px;padding:3px 10px;text-align:center;
}
.row-go{
  justify-self:end;font-size:14px;color:var(--fg-2);border-bottom:1px solid var(--line-2);padding-bottom:3px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.row-go:hover{color:var(--accent);border-color:var(--accent)}
.row-go span{margin-left:5px;font-size:12px}

/* ---------- about note ---------- */
.note-sec{padding:0 var(--pad) clamp(52px,8vw,96px)}
.note{
  max-width:var(--maxw);margin:0 auto;
  border:1px solid var(--line);border-radius:var(--r);background:var(--ink-2);
  padding:clamp(24px,4vw,44px);
  display:grid;gap:14px;
}
.note p{color:var(--fg-2);max-width:62ch;font-size:.98rem;line-height:1.8}
.note .sign{font-family:var(--serif);font-style:italic;color:var(--fg-3)}

/* ===================== footer ===================== */
.site-foot{
  border-top:1px solid var(--line);padding:20px var(--pad) 34px;
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--fg-3);
  max-width:var(--maxw);margin:0 auto;
}
.foot-right{display:flex;align-items:center;gap:9px}

/* ===================== reveal ===================== */
.js .reveal{opacity:0;transform:translateY(16px)}
.js .reveal.in{opacity:1;transform:none;transition:opacity .7s var(--ease),transform .7s var(--ease);transition-delay:calc(var(--i,0) * 70ms)}

/* ===================== responsive ===================== */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:clamp(30px,7vw,44px)}
  .plate{order:2;max-width:460px}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .row{grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"key tag" "body body" "go go";gap:8px 12px;padding:16px 2px}
  .row-key{grid-area:key}
  .row-tag{grid-area:tag;justify-self:end}
  .row-body{grid-area:body}
  .row-go{grid-area:go;justify-self:start;margin-top:6px}
  .row:hover{padding-left:6px}
}
@media (max-width:560px){
  h1{font-size:clamp(2.3rem,11vw,3.1rem)}
  .topnav a:first-child{display:none}
}

/* ===================== reduced motion ===================== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .js .reveal{opacity:1;transform:none}
  .rings circle{opacity:.6}
}