/* ==========================================================================
   U2 ENGINE · 淡抹夕阳 — 传奇世界 1.9 复古服务端
   Single stylesheet: shell + editorial sections + docs
   ========================================================================== */

:root{
  --dusk-1:#111a25;
  --dusk-2:#2b2732;
  --dusk-3:#623a34;
  --dusk-4:#a95635;
  --dusk-5:#d99052;
  --sun:#f6d79a;

  --paper:#f5ecdd;
  --paper-2:#efe3d1;
  --surface:#fbf6ec;
  --ink:#221912;
  --ink-2:#4b3b2e;
  --muted:#82715f;
  --muted-2:#a39380;

  --line:#ddcfba;
  --line-soft:#e9dfd0;
  --line-gold:rgba(180,123,46,.42);

  --gold:#b47b2e;
  --gold-2:#e2b268;
  --gold-3:#8a5a1e;
  --ember:#c2542f;
  --seal:#a83a2a;

  --night:#17110d;
  --night-2:#211811;
  --night-text:#f7ecdc;
  --night-muted:#b3a38f;
  --night-line:rgba(255,255,255,.1);

  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,"SimSun",serif;
  --font-sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Cascadia Code",Consolas,"Courier New",monospace;

  --container:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-sans);font-size:15.5px;line-height:1.8;letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body.is-locked{overflow:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-serif);font-weight:400;line-height:1.2}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(180,123,46,.25);color:var(--ink)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
[id]{scroll-margin-top:96px}

.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:28px}
.skip-link{position:fixed;left:16px;top:-80px;z-index:200;padding:10px 18px;background:var(--gold-2);color:#1a1006;font-size:13px;letter-spacing:.08em;border-radius:2px;transition:top .25s}
.skip-link:focus{top:16px}

/* ---------- Header ---------- */
.ph-header{
  position:fixed;left:0;right:0;top:0;z-index:80;height:74px;display:flex;align-items:center;
  color:var(--night-text);border-bottom:1px solid transparent;
  background:linear-gradient(180deg,rgba(17,16,13,.55),rgba(17,16,13,0));
  transition:height .3s var(--ease),background .3s,border-color .3s;
}
.ph-header.is-scrolled{height:62px;background:rgba(23,17,13,.95);border-bottom-color:var(--night-line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
body[data-page="docs"] .ph-header,
body[data-page="about"] .ph-header,
body[data-page="terms"] .ph-header,
body[data-page="404"] .ph-header{background:rgba(23,17,13,.97);border-bottom-color:var(--night-line)}
.ph-header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:linear-gradient(90deg,transparent,rgba(226,178,104,.35),transparent);pointer-events:none}
.ph-nav{display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%}
.ph-brand{display:flex;align-items:center;gap:12px;flex:none}
.ph-brand__mark{
  width:38px;height:38px;display:grid;place-items:center;flex:none;
  border:1px solid rgba(226,178,104,.42);border-radius:4px;
  background:rgba(226,178,104,.08);font-family:var(--font-serif);
  font-size:14px;letter-spacing:.02em;color:var(--gold-2);
}
.ph-brand__text{display:flex;flex-direction:column;line-height:1.12}
.ph-brand__text b{font-family:var(--font-serif);font-size:17px;font-weight:500;letter-spacing:.18em;color:var(--night-text)}
.ph-brand__text i{font-family:var(--font-mono);font-style:normal;font-size:8px;letter-spacing:.24em;color:var(--night-muted);text-transform:uppercase}
.ph-nav__links{display:flex;align-items:center;gap:4px}
.ph-nav__links a{position:relative;padding:9px 15px;font-size:13px;color:rgba(247,236,220,.72);letter-spacing:.08em;transition:color .25s}
.ph-nav__links a::after{content:"";position:absolute;left:15px;right:15px;bottom:3px;height:1px;background:linear-gradient(90deg,transparent,var(--gold-2),transparent);transform:scaleX(0);transition:transform .3s var(--ease)}
.ph-nav__links a:hover{color:var(--gold-2)}
.ph-nav__links a:hover::after,.ph-nav__links a.is-active::after{transform:scaleX(1)}
.ph-nav__links a.is-active{color:var(--night-text)}
.ph-nav__actions{display:flex;align-items:center;gap:12px;flex:none}
.ph-version{display:inline-flex;align-items:center;gap:7px;height:30px;padding:0 10px;border:1px solid var(--night-line);border-radius:99px;font-family:var(--font-mono);font-size:9px;letter-spacing:.06em;color:var(--night-muted)}
.ph-version i{width:5px;height:5px;border-radius:50%;background:#c98a3a;box-shadow:0 0 0 3px rgba(201,138,58,.12);animation:pulse 2.4s infinite}

.ph-burger{display:none;width:40px;height:40px;border:1px solid var(--night-line);border-radius:4px;position:relative}
.ph-burger span{position:absolute;left:10px;width:20px;height:1.5px;background:var(--night-text);transition:transform .3s var(--ease),opacity .2s}
.ph-burger span:nth-child(1){top:14px}
.ph-burger span:nth-child(2){top:20px}
.ph-burger span:nth-child(3){top:26px}
body.ph-nav-open .ph-burger span:nth-child(1){transform:translateY(6px) rotate(45deg)}
body.ph-nav-open .ph-burger span:nth-child(2){opacity:0}
body.ph-nav-open .ph-burger span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.ph-mobile{position:fixed;inset:0;z-index:70;display:none;flex-direction:column;justify-content:center;padding:100px 28px 44px;background:rgba(23,17,13,.985);opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.ph-mobile a:not(.ph-btn){display:flex;align-items:baseline;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--night-line);font-family:var(--font-serif);font-size:25px;color:var(--night-text)}
.ph-mobile a small{font-family:var(--font-mono);font-size:9px;letter-spacing:.2em;color:var(--night-muted)}
.ph-mobile .ph-btn{margin-top:26px}
body.ph-nav-open .ph-mobile{opacity:1;visibility:visible}

.scroll-progress{position:absolute;left:0;bottom:-1px;height:1px;width:100%;background:linear-gradient(90deg,var(--gold),var(--ember));transform:scaleX(0);transform-origin:left;opacity:.9;z-index:2}

/* Single-screen landing mode */
body.is-landing .ph-nav__links,
body.is-landing .ph-burger,
body.is-landing .ph-mobile,
body.is-landing .ph-footer{display:none !important}
body.is-landing .ph-nav__actions{margin-left:auto}
body.is-landing .ph-landing-label{display:inline-flex;position:absolute;left:50%;transform:translateX(-50%)}
body.is-landing .u2-hero{min-height:100svh}
.ph-landing-label{display:none;align-items:center;gap:8px;font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--night-muted)}
.ph-landing-label::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold-2);box-shadow:0 0 0 3px rgba(226,178,104,.12)}
@media (max-width:960px){body.is-landing .ph-landing-label{display:none}}

/* ---------- Buttons ---------- */
.ph-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:48px;padding:0 26px;border-radius:3px;border:1px solid transparent;
  font-family:var(--font-sans);font-size:14px;font-weight:600;letter-spacing:.08em;
  white-space:nowrap;cursor:pointer;transition:transform .3s var(--ease),background .3s,border-color .3s,box-shadow .3s,color .3s;
}
.ph-btn svg{width:15px;height:15px;flex:none}
.ph-btn--gold{color:#1d1207;border-color:#f0d09a;background:linear-gradient(180deg,#f4d79e 0%,#dbaa5d 55%,#b97f32 100%);box-shadow:inset 0 1px 0 rgba(255,255,255,.55),0 14px 30px -18px rgba(120,70,20,.6)}
.ph-btn--gold:hover{transform:translateY(-1px);background:linear-gradient(180deg,#ffe7b4 0%,#e9bd72 55%,#c98c3c 100%)}
.ph-btn--ghost{color:var(--night-text);border-color:rgba(247,236,220,.26);background:rgba(255,255,255,.03)}
.ph-btn--ghost:hover{border-color:rgba(226,178,104,.6);background:rgba(255,255,255,.06);transform:translateY(-1px)}
.ph-btn--ink{color:var(--paper);border-color:var(--ink);background:var(--ink)}
.ph-btn--ink:hover{background:var(--ember);border-color:var(--ember);transform:translateY(-1px)}
.ph-btn--ghost-ink{color:var(--ink);border-color:rgba(34,25,18,.22);background:rgba(255,255,255,.35)}
.ph-btn--ghost-ink:hover{border-color:var(--gold);background:var(--surface)}
.ph-btn--sm{height:38px;padding:0 16px;font-size:12px}
.ph-btn--lg{height:54px;padding:0 32px;font-size:15px}

.ph-link{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.08em;color:var(--gold-3);transition:color .25s,gap .25s}
.ph-link svg{width:14px;height:14px;transition:transform .25s}
.ph-link:hover{color:var(--ember)}
.ph-link:hover svg{transform:translateX(4px)}

/* ---------- Hero ---------- */
.u2-hero{
  position:relative;min-height:100svh;overflow:hidden;isolation:isolate;
  padding:150px 0 0;color:var(--night-text);
  background:
    radial-gradient(34% 42% at 71% 56%,rgba(246,215,154,.38),transparent 64%),
    radial-gradient(110% 70% at 72% 102%,rgba(180,91,50,.55),transparent 64%),
    radial-gradient(50% 50% at 15% 6%,rgba(17,26,37,.5),transparent 70%),
    linear-gradient(180deg,#111a25 0%,#2b2732 32%,#623a34 58%,#a95635 80%,#d99052 100%);
}
.u2-hero__grain{
  position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.08;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
.u2-hero__grid{
  position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.22;
  background-image:linear-gradient(90deg,rgba(247,236,220,.1) 1px,transparent 1px),linear-gradient(0deg,rgba(247,236,220,.07) 1px,transparent 1px);
  background-size:90px 90px;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 72%);
  mask-image:linear-gradient(180deg,#000,transparent 72%);
}
.u2-hero__embers{position:absolute;inset:0;z-index:2;pointer-events:none}
.u2-hero__city{position:absolute;left:0;right:0;bottom:-2px;width:100%;height:clamp(150px,20vh,220px);object-fit:fill;object-position:center bottom;z-index:2;pointer-events:none;opacity:.92}
.u2-hero__inner{position:relative;z-index:3;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);gap:clamp(30px,5vw,70px);align-items:center;min-height:600px}
.u2-hero__copy{max-width:640px}
.u2-kicker{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--gold-2);text-transform:uppercase}
.u2-kicker::before{content:"";width:24px;height:1px;background:linear-gradient(90deg,var(--gold-2),transparent)}
.u2-kicker--dark{color:var(--gold-3)}
.u2-kicker--dark::before{background:linear-gradient(90deg,var(--gold),transparent)}
.u2-hero h1{
  margin:22px 0 0;font-family:var(--font-serif);font-weight:500;
  font-size:clamp(64px,9.2vw,132px);line-height:.98;letter-spacing:.01em;color:#fdf4e5;
  text-shadow:0 18px 50px rgba(30,10,5,.35);
}
.u2-hero__alias{
  margin-top:12px;font-family:var(--font-serif);font-weight:500;
  font-size:clamp(30px,3.8vw,56px);line-height:1.2;letter-spacing:.26em;
  color:var(--gold-2);text-shadow:0 10px 30px rgba(40,15,5,.3);
}
.u2-hero__rule{display:flex;align-items:center;gap:12px;margin:24px 0 0}
.u2-hero__rule::before{content:"";width:64px;height:1px;background:linear-gradient(90deg,rgba(247,236,220,.55),transparent)}
.u2-hero__rule::after{content:"";width:5px;height:5px;border:1px solid var(--gold-2);transform:rotate(45deg)}
.u2-hero__lead{max-width:540px;margin-top:22px;color:rgba(247,236,220,.8);font-size:15px;line-height:2.05;text-wrap:pretty}
.u2-hero__lead b{color:#fff8ee;font-weight:600}
.u2-nowrap{white-space:nowrap}
.u2-hero__actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:32px}
.u2-hero__art{position:relative;display:flex;align-items:center;justify-content:center;min-height:560px;isolation:isolate}
.u2-hero__sun{
  position:absolute;left:50%;top:46%;width:min(520px,88%);aspect-ratio:1;transform:translate(-50%,-50%);
  border-radius:50%;z-index:0;
  background:radial-gradient(circle,rgba(255,241,204,.9) 0%,rgba(246,215,154,.55) 34%,rgba(226,178,104,.2) 54%,transparent 70%);
  border:1px solid rgba(255,236,194,.18);
  box-shadow:0 0 120px rgba(246,215,154,.16);
}
.u2-hero__art img{
  position:relative;z-index:1;width:min(560px,92%);height:auto;
  filter:drop-shadow(0 34px 70px rgba(30,10,5,.5)) saturate(1.12) contrast(1.03) brightness(1.03);
}
.u2-hero__seal{
  position:absolute;right:6%;bottom:12%;z-index:3;width:46px;height:46px;
  display:grid;place-items:center;padding:4px;background:var(--seal);color:#f4ddc2;
  font-family:var(--font-serif);font-size:10px;line-height:1.5;letter-spacing:.14em;
  writing-mode:vertical-rl;transform:rotate(-3deg);box-shadow:0 10px 24px -12px rgba(20,8,4,.8);
}
.u2-hero__label{
  position:absolute;right:-6px;top:50%;transform:translateY(-50%);z-index:3;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.22em;color:rgba(247,236,220,.5);
  writing-mode:vertical-rl;white-space:nowrap;
}

/* facts strip */
.u2-facts{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line);background:var(--paper)}
.u2-fact{padding:26px 24px;border-left:1px solid var(--line)}
.u2-fact:first-child{border-left:0;padding-left:0}
.u2-fact b{display:block;font-family:var(--font-serif);font-size:34px;font-weight:500;line-height:1;color:var(--ink)}
.u2-fact span{display:block;margin-top:7px;font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--muted-2)}

/* ---------- Sections ---------- */
.u2-section{position:relative;padding:clamp(84px,9.5vw,140px) 0}
.u2-section--tint{background:var(--paper-2)}
.u2-h2{
  margin-top:18px;font-family:var(--font-serif);font-weight:500;
  font-size:clamp(40px,5.4vw,82px);line-height:1.14;letter-spacing:.01em;color:var(--ink);
  text-wrap:balance;
}
.u2-h2 em{font-style:normal;color:var(--gold-3)}
.u2-h2--compact{font-size:clamp(34px,4.5vw,64px)}
.u2-h2--light{color:var(--night-text)}
.u2-h2--light em{color:var(--gold-2)}
.u2-lead{color:var(--muted);font-size:15px;line-height:2.05;max-width:620px}
.u2-rule{height:1px;background:var(--line);margin:34px 0}

/* manifesto */
.u2-manifesto__grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,6vw,96px);margin-top:clamp(34px,4vw,52px)}
.u2-manifesto__lead{
  font-family:var(--font-serif);font-size:clamp(22px,2.4vw,30px);line-height:1.85;
  color:var(--ink-2);letter-spacing:.01em;
}
.u2-manifesto__text p{font-size:14.5px;line-height:2.05;color:var(--muted);margin-bottom:16px}
.u2-manifesto__text p:last-child{margin-bottom:0}
.u2-sign{display:inline-flex;align-items:center;gap:12px;margin-top:26px;font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;color:var(--gold-3)}
.u2-sign::before{content:"";width:30px;height:1px;background:var(--gold)}

/* three facts */
.u2-grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);margin-top:clamp(36px,4.4vw,56px)}
.u2-grid3__item{padding:30px 28px 34px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.u2-grid3__item:first-child{padding-left:0}
.u2-grid3__item:last-child{border-right:0}
.u2-grid3__no{font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--gold-3)}
.u2-grid3__item h3{margin:16px 0 12px;font-size:24px;color:var(--ink);letter-spacing:.03em}
.u2-grid3__item p{font-size:13.5px;line-height:2;color:var(--muted)}
.u2-grid3__item ul{margin-top:18px;display:grid;gap:6px}
.u2-grid3__item li{position:relative;padding-left:14px;font-size:11.5px;color:var(--ink-2)}
.u2-grid3__item li::before{content:"";position:absolute;left:0;top:9px;width:4px;height:4px;background:var(--gold);transform:rotate(45deg)}
.u2-grid4{grid-template-columns:repeat(4,1fr)}

/* script band */
.u2-script{background:var(--night);color:var(--night-text);position:relative;overflow:hidden}
.u2-script::before{content:"";position:absolute;right:-10%;top:-20%;width:50%;height:80%;background:radial-gradient(circle,rgba(180,123,46,.12),transparent 68%);pointer-events:none}
.u2-script__grid{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(34px,5vw,72px);align-items:center}
.u2-script .u2-lead{color:var(--night-muted)}
.u2-custom-groups{display:grid;gap:16px;margin-top:22px}
.u2-custom-label{display:block;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.14em;color:var(--night-muted);margin-bottom:7px}
.u2-custom-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.u2-custom-group .u2-custom-tags{margin-top:0}
.u2-custom-tags span{font-family:var(--font-mono);font-size:9px;letter-spacing:.06em;color:var(--gold-2);border:1px solid rgba(226,178,104,.26);padding:5px 9px;background:rgba(255,255,255,.025)}
.u2-checks{margin-top:24px;display:grid;gap:10px}
.u2-checks li{position:relative;padding-left:18px;font-size:12.5px;color:var(--night-muted)}
.u2-checks li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border:1px solid var(--gold-2);transform:rotate(45deg)}
.u2-terminal{border:1px solid rgba(226,178,104,.24);border-radius:4px;background:#120e0a;box-shadow:0 30px 60px -34px rgba(0,0,0,.8);overflow:hidden}
.u2-terminal__bar{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;border-bottom:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.03);font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;color:#8e8272}
.u2-terminal__bar span{display:flex;align-items:center;gap:8px}
.u2-terminal__bar i{width:6px;height:6px;border-radius:50%;background:var(--gold-2);box-shadow:0 0 8px rgba(226,178,104,.5)}
.u2-terminal pre{margin:0;padding:24px;font-family:var(--font-mono);font-size:12px;line-height:1.95;color:#d8c8b2;overflow-x:auto;white-space:pre}
.u2-terminal .c{color:#7c7f80}
.u2-terminal .k{color:#e2b268}
.u2-terminal .s{color:#b7c7a8}
.u2-terminal .n{color:#c98d6a}
.u2-terminal__note{padding:0 24px 20px;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.06em;color:#6f6a60}

/* tools */
.u2-tools__head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px}
.u2-tools__head .u2-lead{max-width:380px}
.u2-toolgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line);margin-top:clamp(34px,4vw,52px)}
.u2-tool{display:flex;gap:18px;padding:28px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);transition:background .25s}
.u2-tool:hover{background:rgba(180,123,46,.04)}
.u2-tool__icon{width:44px;height:44px;display:grid;place-items:center;flex:none;border:1px solid var(--line-gold);color:var(--gold-3);background:rgba(180,123,46,.05)}
.u2-tool__icon svg{width:21px;height:21px}
.u2-tool h3{font-size:18px;color:var(--ink);margin-bottom:6px;letter-spacing:.03em}
.u2-tool p{font-size:12.5px;line-height:1.95;color:var(--muted)}
.u2-tool .tag{display:inline-block;margin-top:12px;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.06em;color:var(--gold-3);border:1px solid var(--line);padding:2px 7px}

/* 1.9 */
.u2-19{position:relative;overflow:hidden}
.u2-19__grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(30px,5vw,80px);align-items:center}
.u2-19__num{
  font-family:var(--font-serif);font-size:clamp(140px,20vw,280px);line-height:.8;
  color:transparent;-webkit-text-stroke:1px rgba(180,123,46,.5);
  letter-spacing:-.06em;
}
.u2-19__copy .u2-lead{margin-top:20px}
.u2-19__meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.u2-19__meta span{font-family:var(--font-mono);font-size:9px;letter-spacing:.08em;color:var(--gold-3);border:1px solid var(--line);padding:4px 9px}

/* client customization */
.u2-client{position:relative;overflow:hidden}
.u2-client .container{position:relative;z-index:1}
.u2-client__note{margin-top:24px;font-family:var(--font-mono);font-size:9px;letter-spacing:.04em;color:var(--muted-2)}

/* sunset brand band */
.u2-brand{
  position:relative;overflow:hidden;padding:clamp(90px,11vw,150px) 0;
  color:var(--night-text);
  background:
    radial-gradient(34% 50% at 72% 66%,rgba(246,215,154,.35),transparent 64%),
    radial-gradient(120% 80% at 70% 102%,rgba(180,91,50,.55),transparent 62%),
    linear-gradient(180deg,#15202b 0%,#382c34 36%,#714033 66%,#b45b32 100%);
}
.u2-brand::after{content:"";position:absolute;left:0;right:0;bottom:0;height:220px;background:url("../img/city-wall.svg") center bottom / 100% auto no-repeat;opacity:.5;pointer-events:none}
.u2-brand__inner{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:60px;align-items:center}
.u2-brand__quote{font-family:var(--font-serif);font-size:clamp(34px,4.8vw,68px);line-height:1.3;color:#fdf3e3;letter-spacing:.02em}
.u2-brand__quote em{font-style:normal;color:var(--gold-2)}
.u2-brand__copy p{margin-top:22px;max-width:480px;font-size:14px;line-height:2.05;color:rgba(247,236,220,.72)}
.u2-brand__copy .ph-link{color:var(--gold-2);margin-top:24px}

/* CTA */
.u2-cta{padding:clamp(80px,10vw,140px) 0;text-align:center;background:var(--paper)}
.u2-cta .u2-kicker{justify-content:center}
.u2-cta h2{margin-top:20px;font-family:var(--font-serif);font-size:clamp(44px,7vw,92px);line-height:1.12;color:var(--ink)}
.u2-cta h2 em{font-style:normal;color:var(--gold-3)}
.u2-cta p{margin:18px auto 0;max-width:520px;font-size:13.5px;line-height:1.9;color:var(--muted)}
.u2-cta__actions{display:flex;justify-content:center;gap:12px;margin-top:32px;flex-wrap:wrap}

/* ---------- Engine hero ---------- */
.u2-engine-hero{position:relative;overflow:hidden;padding:140px 0 80px;color:var(--night-text);border-bottom:1px solid var(--night-line);background:
  radial-gradient(40% 55% at 76% 54%,rgba(246,215,154,.22),transparent 64%),
  radial-gradient(110% 75% at 70% 106%,rgba(180,91,50,.45),transparent 64%),
  linear-gradient(180deg,#111a25 0%,#2b2732 38%,#5b3531 70%,#8f4930 100%);
}
.u2-engine-hero__inner{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);gap:clamp(30px,5vw,64px);align-items:center;min-height:440px}
.u2-engine-hero h1{margin-top:18px;font-family:var(--font-serif);font-weight:500;font-size:clamp(44px,5.2vw,74px);line-height:1.12;color:#fdf4e5}
.u2-engine-hero h1 em{font-style:normal;color:var(--gold-2)}
.u2-engine-hero .u2-hero__lead{margin-top:18px}
.u2-engine-hero__art{position:relative;display:flex;align-items:center;justify-content:center;min-height:380px}
.u2-engine-hero__art .u2-hero__sun{width:min(400px,86%)}
.u2-engine-hero__art img{position:relative;z-index:1;width:min(360px,78%);height:auto;filter:drop-shadow(0 26px 56px rgba(30,10,5,.45)) saturate(1.06)}
.u2-engine-hero__badge{position:absolute;right:6%;top:8%;z-index:3;padding:8px 12px;border:1px solid rgba(226,178,104,.3);font-family:var(--font-mono);font-size:8px;letter-spacing:.1em;color:var(--gold-2)}

/* subnav */
.ph-subnav{position:sticky;top:62px;z-index:40;background:rgba(245,236,221,.94);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.ph-subnav__inner{display:flex;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:none}
.ph-subnav__inner::-webkit-scrollbar{display:none}
.ph-subnav a{display:block;padding:14px 16px;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.1em;color:var(--muted);white-space:nowrap;border-bottom:1.5px solid transparent;transition:color .25s,border-color .25s}
.ph-subnav a:hover{color:var(--ink)}
.ph-subnav a.is-active{color:var(--gold-3);border-bottom-color:var(--gold)}
.ph-subnav__meta{margin-left:auto;padding-left:20px;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.1em;color:var(--muted-2);white-space:nowrap}

/* ---------- Editorial detail components ---------- */
.u2-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(34px,5vw,72px);align-items:start}
.u2-detail-list{border-top:1px solid var(--line)}
.u2-detail-list li{display:grid;grid-template-columns:110px minmax(0,1fr);gap:18px;padding:18px 0;border-bottom:1px solid var(--line-soft)}
.u2-detail-list dt,.u2-detail-list .term{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.12em;color:var(--gold-3);padding-top:3px}
.u2-detail-list dd,.u2-detail-list .desc{margin:0;font-size:13px;line-height:1.95;color:var(--muted)}
.u2-detail-list b{color:var(--ink);font-weight:600}
.u2-code{border:1px solid rgba(255,255,255,.08);border-radius:4px;background:#17110d;overflow:hidden;margin:24px 0}
.u2-code__bar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid rgba(255,255,255,.08);font-family:var(--font-mono);font-size:9px;letter-spacing:.08em;color:#8e8272}
.u2-code pre{margin:0;padding:20px;font-family:var(--font-mono);font-size:12px;line-height:1.9;color:#d8c8b2;overflow-x:auto;white-space:pre}
.u2-code .c{color:#7c7f80}
.u2-code .k{color:#e2b268}
.u2-code .s{color:#b7c7a8}
.u2-note{padding:16px 20px;border-left:2px solid var(--gold);background:rgba(180,123,46,.06);font-size:12.5px;line-height:1.95;color:var(--ink-2);margin:20px 0}
.u2-note b{color:var(--gold-3)}

/* ---------- Footer ---------- */
.ph-footer{position:relative;z-index:2;overflow:hidden;background:var(--night);border-top:1px solid rgba(255,255,255,.07);padding:clamp(46px,5.6vw,70px) 0 0;color:var(--night-text)}
.ph-footer__top{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.15fr;gap:clamp(26px,3.6vw,54px);padding-bottom:42px}
.ph-footer .ph-brand__mark{border-color:rgba(226,178,104,.34);background:rgba(226,178,104,.08);color:var(--gold-2)}
.ph-footer .ph-brand__text b{color:var(--night-text)}
.ph-footer .ph-brand__text i{color:var(--night-muted)}
.ph-footer__brand p{margin-top:16px;max-width:360px;font-size:12px;line-height:1.95;color:var(--night-muted)}
.ph-footer .ph-version{margin-top:18px;border-color:var(--night-line);color:var(--night-muted)}
.ph-footer__col h5{font-family:var(--font-mono);font-size:9px;font-weight:400;letter-spacing:.16em;color:var(--gold-2);text-transform:uppercase;margin-bottom:16px}
.ph-footer__col li{margin-bottom:9px}
.ph-footer__col a{font-size:12px;color:var(--night-muted);transition:color .2s}
.ph-footer__col a:hover{color:var(--gold-2)}
.ph-footer__col .muted{font-size:11.5px;color:#7c766b}
.ph-footer__bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:20px 0;border-top:1px solid rgba(255,255,255,.07);font-family:var(--font-mono);font-size:9px;letter-spacing:.02em;color:#7c766b}
.ph-footer__bottom a{color:#7c766b}
.ph-footer__bottom a:hover{color:var(--gold-2)}
.ph-footer__warn{max-width:430px;line-height:1.8;color:#5a564e}
.ph-footer__mark{position:absolute;right:-4%;bottom:-22%;width:clamp(280px,28vw,460px);opacity:.035;pointer-events:none}

/* ---------- Page hero (docs/about/terms) ---------- */
.u2-page-hero{position:relative;padding:150px 0 clamp(56px,7vw,84px);border-bottom:1px solid var(--line);background:
  radial-gradient(60% 100% at 80% 0%,rgba(180,123,46,.1),transparent 60%),
  linear-gradient(180deg,var(--paper),var(--paper-2));
  overflow:hidden;
}
.u2-page-hero::after{content:"";position:absolute;right:-4%;top:12%;width:min(520px,45vw);height:80%;background:url("../img/phoenix-silhouette.svg") right center / contain no-repeat;opacity:.07;filter:brightness(.25);pointer-events:none}
.u2-breadcrumb{display:flex;align-items:center;gap:9px;margin-bottom:22px;font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;color:var(--muted-2)}
.u2-breadcrumb a:hover{color:var(--gold-3)}
.u2-breadcrumb span{color:var(--gold)}
.u2-page-hero h1{margin-top:16px;font-family:var(--font-serif);font-weight:500;font-size:clamp(40px,5.4vw,72px);line-height:1.15;color:var(--ink);letter-spacing:.01em}
.u2-page-hero .u2-lead{margin-top:20px;max-width:640px}
.u2-page-hero__meta{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:26px;font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--muted-2)}
.u2-page-hero__meta b{color:var(--gold-3);font-weight:500}

/* ---------- Docs ---------- */
.u2-docs{display:grid;grid-template-columns:230px minmax(0,1fr);gap:clamp(30px,5vw,64px);align-items:start;padding:clamp(60px,7vw,96px) 0}
.u2-docs__side{position:sticky;top:96px;border-left:1px solid var(--line);padding-left:20px}
.u2-docs__side h5{font-family:var(--font-mono);font-size:9px;font-weight:400;letter-spacing:.16em;color:var(--gold-3);text-transform:uppercase;margin-bottom:14px}
.u2-docs__side > div + div{margin-top:26px}
.u2-docs__side li a{display:block;padding:6px 0;font-size:12.5px;color:var(--muted);transition:color .2s,padding-left .2s}
.u2-docs__side li a:hover,.u2-docs__side li a.is-active{color:var(--gold-3);padding-left:4px}
.u2-docs__body h2{font-family:var(--font-serif);font-weight:500;font-size:30px;color:var(--ink);margin:46px 0 16px;padding-top:6px}
.u2-docs__body h2:first-child{margin-top:0}
.u2-docs__body h3{font-family:var(--font-sans);font-size:16px;font-weight:600;color:var(--ink);margin:28px 0 10px}
.u2-docs__body p{font-size:13.5px;line-height:2.05;color:var(--muted);margin:12px 0}
.u2-docs__body ul.dots{display:grid;gap:8px;margin:12px 0}
.u2-docs__body ul.dots li{position:relative;padding-left:16px;font-size:13px;line-height:1.9;color:var(--muted)}
.u2-docs__body ul.dots li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;background:var(--gold);transform:rotate(45deg)}
.u2-docs__body code{font-family:var(--font-mono);font-size:11.5px;color:var(--gold-3);background:rgba(180,123,46,.08);border:1px solid var(--line-soft);padding:1px 6px;white-space:nowrap}
.u2-docs__body .u2-note{font-size:12.5px}
.u2-step{display:grid;grid-template-columns:40px minmax(0,1fr);gap:16px;padding:20px 0;border-top:1px solid var(--line-soft)}
.u2-step:last-child{border-bottom:1px solid var(--line-soft)}
.u2-step__no{font-family:var(--font-mono);font-size:10px;color:var(--gold-3);padding-top:2px}
.u2-step h3{margin:0 0 6px}
.u2-step p{margin:0}

/* ---------- About / legal prose ---------- */
.u2-prose{max-width:720px;padding:clamp(60px,7vw,96px) 0}
.u2-prose h2{font-family:var(--font-serif);font-weight:500;font-size:28px;color:var(--ink);margin:40px 0 14px}
.u2-prose h2:first-child{margin-top:0}
.u2-prose p{font-size:13.5px;line-height:2.05;color:var(--muted);margin:12px 0}
.u2-prose strong{color:var(--ink);font-weight:600}
.u2-prose code{font-family:var(--font-mono);font-size:11.5px;color:var(--gold-3);background:rgba(180,123,46,.08);border:1px solid var(--line-soft);padding:1px 6px;white-space:nowrap}
.u2-prose ul{display:grid;gap:8px;margin:14px 0}
.u2-prose li{position:relative;padding-left:16px;font-size:13px;line-height:1.9;color:var(--muted)}
.u2-prose li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;background:var(--gold);transform:rotate(45deg)}
.u2-about-quote,.u2-native__quote{margin:36px 0;padding:26px 0 26px 24px;border-left:2px solid var(--gold);font-family:var(--font-serif);font-size:clamp(20px,2.4vw,28px);line-height:1.9;color:var(--ink-2)}
.u2-about-quote cite,.u2-native__quote cite{display:block;margin-top:10px;font-family:var(--font-mono);font-style:normal;font-size:9px;letter-spacing:.12em;color:var(--muted-2)}

/* ---------- 404 ---------- */
.u2-404{padding:clamp(120px,16vh,200px) 0;text-align:center;background:var(--paper)}
.u2-404__code{font-family:var(--font-serif);font-size:clamp(120px,20vw,240px);line-height:.9;color:transparent;-webkit-text-stroke:1px rgba(180,123,46,.5)}
.u2-404 h1{margin-top:18px;font-family:var(--font-serif);font-weight:500;font-size:clamp(30px,4vw,44px);color:var(--ink)}
.u2-404 p{margin:16px auto 0;max-width:480px;color:var(--muted);font-size:13.5px}
.u2-404 .u2-cta__actions{margin-top:30px}

/* ---------- Modal ---------- */
.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:24px;background:rgba(20,14,10,.82);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.modal.is-open{opacity:1;visibility:visible}
.modal__box{position:relative;width:min(480px,100%);padding:38px 34px;border:1px solid var(--line-gold);background:linear-gradient(165deg,#fdf7ec,#f1e5d4);box-shadow:0 30px 80px -34px rgba(30,18,8,.6);transform:translateY(14px);transition:transform .4s var(--ease);color:var(--ink)}
.modal.is-open .modal__box{transform:none}
.modal__box h3{font-family:var(--font-serif);font-size:24px;font-weight:500;color:var(--ink)}
.modal__box p{margin-top:12px;font-size:13px;line-height:1.9;color:var(--muted)}
.modal__close{position:absolute;top:12px;right:14px;font-size:22px;line-height:1;color:var(--muted-2);padding:4px 8px}
.modal__close:hover{color:var(--gold-3)}
.field{margin-top:20px}
.field label{display:block;font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;color:var(--muted-2);margin-bottom:8px}
.field input{width:100%;height:46px;padding:0 14px;background:#fffdf8;border:1px solid var(--line);border-radius:2px;color:var(--ink);font:inherit;font-size:13px}
.field input:focus{outline:0;border-color:var(--gold);background:#fff}
.modal__actions{display:flex;gap:10px;margin-top:24px}
.modal__actions .btn--primary{flex:1}
.modal__hint{margin-top:16px;font-size:11px;line-height:1.8;color:var(--muted-2)}
.modal .btn--primary{color:#1d1207;border:1px solid #f0d09a;background:linear-gradient(180deg,#f4d79e,#dbaa5d 55%,#b97f32);height:46px;padding:0 18px;font-size:13px;border-radius:2px}
.modal .btn--ghost{color:var(--ink);border:1px solid var(--line);background:#fff;height:46px;padding:0 18px;font-size:13px;border-radius:2px}

/* ---------- Reveal/embers ---------- */
.js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js [data-reveal].is-visible{opacity:1;transform:none}
[data-reveal][data-delay="1"]{transition-delay:.08s}
[data-reveal][data-delay="2"]{transition-delay:.16s}
[data-reveal][data-delay="3"]{transition-delay:.24s}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.8)}}

/* ---------- Responsive ---------- */
@media (max-width:1120px){
  .u2-hero__inner{grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:32px}
  .u2-hero h1{font-size:clamp(68px,9vw,118px)}
  .u2-hero__alias{font-size:clamp(28px,3.4vw,44px)}
  .u2-hero__art{min-height:480px}
  .u2-hero__art img{width:min(480px,94%)}
  .u2-manifesto__grid{grid-template-columns:1fr;gap:28px}
  .u2-script__grid{grid-template-columns:1fr;gap:34px}
  .u2-brand__inner{grid-template-columns:1fr;gap:30px}
  .u2-engine-hero__inner{grid-template-columns:1fr;min-height:0}
  .u2-engine-hero__art{min-height:320px}
  .u2-engine-hero__art img{width:min(300px,64vw)}
  .u2-grid3,.u2-grid4{grid-template-columns:1fr}
  .u2-grid3__item{border-right:0;padding-left:0}
  .u2-grid4{grid-template-columns:1fr 1fr}
  .u2-docs{grid-template-columns:1fr}
  .u2-docs__side{position:static;border-left:0;border-bottom:1px solid var(--line);padding:0 0 18px;display:flex;gap:30px;flex-wrap:wrap}
  .u2-docs__side h5{margin-bottom:8px}
  .u2-docs__side > div + div{margin-top:0}
  .u2-docs__side ul{display:flex;gap:16px;flex-wrap:wrap}
}
@media (max-width:960px){
  .ph-nav__links,.ph-version{display:none}
  .ph-burger{display:block}
  .ph-mobile{display:flex}
  .u2-hero{padding-top:120px;min-height:auto}
  .u2-hero__inner{grid-template-columns:1fr;min-height:0;gap:26px}
  .u2-hero__copy{max-width:none}
  .u2-hero__art{min-height:420px;order:2}
  .u2-hero__art img{width:min(390px,82%)}
  .u2-hero__alias{letter-spacing:.18em}
  .u2-hero__city{height:150px;object-fit:cover;object-position:center bottom;opacity:.75}
  .u2-hero__label{display:none}
  .u2-hero__seal{right:8%;bottom:6%}
  .u2-facts{grid-template-columns:1fr 1fr}
  .u2-fact:nth-child(3){border-left:0;padding-left:0}
  .u2-fact:nth-child(3),.u2-fact:nth-child(4){border-top:1px solid var(--line)}
  .u2-tools__head{flex-direction:column;align-items:flex-start;gap:16px}
  .u2-toolgrid{grid-template-columns:1fr}
  .u2-19__grid{grid-template-columns:1fr;gap:24px}
  .u2-19__num{font-size:clamp(120px,26vw,200px)}
  .ph-footer__top{grid-template-columns:1fr 1fr}
  .u2-cta__actions .ph-btn{width:auto}
  .u2-page-hero{padding-top:120px}
  .u2-page-hero::after{opacity:.04;width:360px}
}
@media (max-width:720px){
  .container{padding-inline:20px}
  .u2-hero{padding-top:112px}
  .u2-hero h1{font-size:clamp(56px,17vw,86px)}
  .u2-hero__alias{font-size:clamp(26px,8vw,36px)}
  .u2-hero__actions{flex-direction:column;align-items:stretch}
  .u2-hero__actions .ph-btn{width:100%}
  .u2-hero__lead{font-size:13.5px}
  .u2-hero__art{min-height:340px}
  .u2-hero__art img{width:min(310px,86%)}
  .u2-hero__city{height:100px}
  .u2-hero__seal{display:none}
  .u2-h2{font-size:clamp(32px,9vw,48px)}
  .u2-grid4{grid-template-columns:1fr}
  .u2-manifesto__lead{font-size:20px}
  .u2-tool{padding:22px 18px}
  .u2-toolgrid{margin-top:30px}
  .u2-brand__quote{font-size:clamp(28px,8.4vw,42px)}
  .u2-brand::after{height:110px}
  .u2-cta h2{font-size:clamp(38px,11vw,58px)}
  .u2-cta__actions{flex-direction:column}
  .u2-cta__actions .ph-btn{width:100%}
  .ph-footer__top{grid-template-columns:1fr}
  .ph-footer__bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .u2-docs{padding:44px 0}
  .u2-docs__side ul{gap:10px 16px}
  .u2-step{grid-template-columns:30px minmax(0,1fr)}
  .u2-detail-grid{grid-template-columns:1fr}
  .u2-detail-list li{grid-template-columns:90px minmax(0,1fr)}
  .u2-terminal pre{font-size:11px;padding:18px}
  .u2-code pre{font-size:11px}
}
@media (max-width:380px){
  .ph-nav__actions .ph-btn{display:none}
  .u2-facts{grid-template-columns:1fr}
  .u2-fact{border-left:0;padding-left:0}
  .u2-fact:nth-child(2),.u2-fact:nth-child(3),.u2-fact:nth-child(4){border-top:1px solid var(--line)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .js [data-reveal]{opacity:1;transform:none}
}