/* Doppo Works — editorial, elegant, ink + red on warm paper. */
:root{
  --paper:#f7f5f0;
  --paper-2:#fffdf9;
  --ink:#1a1a18;
  --ink-soft:#57534c;
  --ink-faint:#8a857c;
  --line:#e6e1d7;
  --red:#d92d20;
  --red-deep:#b42318;
  --serif:ui-serif,"Iowan Old Style","Palatino Linotype",Palatino,"Georgia",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --jp:"Hiragino Mincho ProN","Yu Mincho","YuMincho","Noto Serif JP",var(--serif);
  --wrap:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.2) blur(8px);
  background:color-mix(in srgb,var(--paper) 82%,transparent);border-bottom:1px solid transparent;transition:border-color .3s}
.nav.scrolled{border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;gap:14px;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:600;letter-spacing:.01em}
.brand .mark{width:32px;height:32px;color:var(--ink);display:block}
.brand .wordmark{font-family:var(--serif);font-size:19px;font-weight:600}
.brand .wordmark b{font-weight:600}
.nav .spacer{flex:1}
.nav .links{display:flex;gap:30px;font-size:14.5px;color:var(--ink-soft)}
.nav .links a{position:relative;padding:4px 0}
.nav .links a:hover{color:var(--ink)}
.nav .links a::after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:1px;background:var(--red);transition:right .3s}
.nav .links a:hover::after{right:0}

/* ---------- hero ---------- */
.hero{position:relative;padding:96px 0 84px;overflow:hidden}
.hero .ghost-mark{position:absolute;right:-6%;top:-8%;width:min(560px,52vw);color:var(--ink);opacity:.05;pointer-events:none}
/* logo.png is transparent (background keyed out), so it drops onto the paper with no blend */
.hero .hero-logo{position:absolute;right:clamp(20px,2.5vw,52px);top:52%;transform:translateY(-50%);width:min(430px,40vw);pointer-events:none}
/* below this width the solid logo would overlap the lede — hide it for a clean text hero */
@media(max-width:960px){.hero .hero-logo{display:none}}
.hero .wrap{position:relative}
.kanji{font-family:var(--jp);color:var(--ink);line-height:1;font-weight:600}
.hero .kanji{font-size:clamp(76px,13vw,150px);letter-spacing:.06em}
.hero .reading{margin:18px 0 0;color:var(--ink-soft);font-size:15px;letter-spacing:.28em;text-transform:uppercase}
.hero .reading .r{color:var(--red);font-weight:600}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(34px,5.2vw,62px);line-height:1.05;margin:26px 0 0;max-width:16ch;letter-spacing:-.01em}
.hero h1 .dot{color:var(--red)}
.hero .lede{margin:24px 0 0;max-width:52ch;font-size:19px;color:var(--ink-soft)}
.cta-row{margin-top:38px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;font-size:15px;font-weight:550;
  padding:12px 22px;border-radius:999px;border:1px solid var(--ink);transition:.2s;cursor:pointer}
.btn.solid{background:var(--ink);color:var(--paper-2);border-color:var(--ink)}
.btn.solid:hover{background:#000}
.btn.ghost:hover{background:var(--ink);color:var(--paper-2)}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(3px)}

/* ---------- section scaffolding ---------- */
section{padding:88px 0}
.eyebrow{font-size:12.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--red);font-weight:650;margin:0 0 18px}
.h2{font-family:var(--serif);font-weight:600;font-size:clamp(28px,3.6vw,42px);line-height:1.1;margin:0;letter-spacing:-.01em}
.measure{max-width:60ch}
.lead{font-size:19px;color:var(--ink-soft)}

/* ---------- meaning ---------- */
.meaning{border-top:1px solid var(--line)}
.meaning .grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:64px;align-items:center}
.glyphs{display:flex;gap:26px}
.glyph{flex:1;background:var(--paper-2);border:1px solid var(--line);border-radius:16px;padding:26px 22px;text-align:center}
.glyph .big{font-family:var(--jp);font-size:76px;line-height:1;color:var(--ink)}
.glyph .lbl{margin-top:14px;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
.glyph .mean{margin-top:4px;font-size:15px;color:var(--ink-soft)}
.meaning blockquote{margin:0;font-family:var(--serif);font-size:clamp(22px,2.6vw,30px);line-height:1.34}
.meaning blockquote .red{color:var(--red)}

/* ---------- philosophy (dark band) ---------- */
.band{background:var(--ink);color:#efece5}
.band .eyebrow{color:#ff6a5c}
.band .h2{color:#fff}
.band .lead{color:#c7c2b8}
.band .rule{width:44px;height:3px;background:var(--red);border-radius:2px;margin:0 0 26px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px}
.stat{border:1px solid #34322d;border-radius:14px;padding:24px}
.stat .n{font-family:var(--serif);font-size:30px;color:#fff}
.stat .n .red{color:#ff6a5c}
.stat .d{color:#a8a49a;font-size:15px;margin-top:6px}

/* ---------- products ---------- */
.products .head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:44px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--paper-2);border:1px solid var(--line);border-radius:18px;padding:28px 26px;display:flex;flex-direction:column;gap:12px;transition:.25s}
.card:hover{transform:translateY(-4px);border-color:#d8d2c6;box-shadow:0 18px 40px -24px rgba(26,26,24,.28)}
.card .tag{align-self:flex-start;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:650;padding:3px 10px;border-radius:999px}
.tag.live{color:var(--red);background:color-mix(in srgb,var(--red) 12%,transparent);border:1px solid color-mix(in srgb,var(--red) 34%,transparent)}
.tag.soon{color:var(--ink-faint);background:transparent;border:1px solid var(--line)}
.card h3{font-family:var(--serif);font-weight:600;font-size:22px;margin:2px 0 0}
.card p{margin:0;color:var(--ink-soft);font-size:15.5px}
.card .meta{margin-top:auto;padding-top:14px;font-size:13px;color:var(--ink-faint);font-family:ui-monospace,Menlo,monospace}
.card.kernel{grid-column:1/-1;background:linear-gradient(180deg,#fffdf9,#f4f0e8);flex-direction:row;align-items:center;gap:30px;flex-wrap:wrap}
.card.kernel .left{flex:1;min-width:260px;display:flex;flex-direction:column;gap:12px}
.card.kernel .diagram{flex:1;min-width:260px}

/* ---------- principles ---------- */
.principles{border-top:1px solid var(--line)}
.plist{display:grid;grid-template-columns:repeat(2,1fr);gap:2px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:44px}
.pitem{background:var(--paper);padding:30px 30px}
.pitem .k{display:flex;align-items:center;gap:11px;font-family:var(--serif);font-size:20px;font-weight:600}
.pitem .k .d{width:9px;height:9px;border-radius:50%;background:var(--red);flex:none}
.pitem p{margin:10px 0 0;color:var(--ink-soft);font-size:15.5px}

/* ---------- closing ---------- */
.closing{text-align:center;padding:104px 0}
.closing .kanji{font-size:clamp(60px,10vw,120px);opacity:.9}
.closing h2{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4.4vw,52px);margin:20px 0 0}
.closing p{color:var(--ink-soft);margin:16px auto 0;max-width:46ch}

/* ---------- footer ---------- */
footer{background:var(--ink);color:#c7c2b8;padding:56px 0 40px}
footer .row{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center}
footer .brand .mark{color:#fff}
footer .brand .wordmark{color:#fff}
footer .fine{font-size:13.5px;color:#8f8b81}
/* the red dot easter-egg → /beta */
.beta-dot{display:inline-block;width:11px;height:11px;border-radius:50%;background:var(--red);vertical-align:baseline;
  transition:transform .2s,box-shadow .2s;cursor:pointer}
.beta-dot:hover{transform:scale(1.25);box-shadow:0 0 0 5px color-mix(in srgb,var(--red) 22%,transparent)}

/* ---------- beta page ---------- */
.beta-hero{padding:80px 0 30px}
.beta-hero .kanji{font-size:clamp(48px,8vw,84px)}
.beta-hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4.6vw,50px);margin:18px 0 0}
.beta-note{display:inline-flex;align-items:center;gap:9px;margin-top:18px;font-size:13.5px;color:var(--ink-soft);
  border:1px solid var(--line);background:var(--paper-2);border-radius:999px;padding:7px 15px}
.beta-note .d{width:8px;height:8px;border-radius:50%;background:var(--red)}
.dl{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;padding-bottom:40px}
.dl .card{gap:14px}
.code{background:#1a1a18;color:#efece5;border-radius:12px;padding:13px 15px;font-family:ui-monospace,Menlo,monospace;
  font-size:13px;line-height:1.6;overflow-x:auto;white-space:pre;position:relative}
.code .c{color:#8f8b81}
.linkrow{display:flex;gap:18px;font-size:14px;margin-top:2px}
.linkrow a{color:var(--red);font-weight:550}
.linkrow a:hover{text-decoration:underline}
.back{display:inline-flex;align-items:center;gap:8px;color:var(--ink-soft);font-size:14px;margin-top:30px}
.back:hover{color:var(--ink)}

@media(max-width:860px){
  .nav .links{display:none}
  .meaning .grid{grid-template-columns:1fr;gap:36px}
  .cards,.plist,.dl{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  section{padding:64px 0}
  .card.kernel{flex-direction:column;align-items:flex-start}
}

/* kernel-card diagram — theme-aware via vars (same look in light, adapts in dark) */
.kdiagram .box-dark{fill:var(--ink)}
.kdiagram .box-dark-t{fill:var(--paper)}
.kdiagram .box-lite{fill:var(--paper-2);stroke:var(--line)}
.kdiagram .box-lite-t{fill:var(--ink)}
.kdiagram .conn{stroke:var(--line)}
.kdiagram .gate{fill:var(--red);stroke:var(--red)}
.kdiagram .muted{fill:var(--ink-faint)}

/* ---------- dark mode — follows the system / browser preference ---------- */
@media (prefers-color-scheme: dark){
  :root{
    --paper:#17140e;      /* warm charcoal */
    --paper-2:#221e16;    /* raised panels / cards */
    --ink:#ece6db;        /* warm off-white */
    --ink-soft:#b0a99b;
    --ink-faint:#7c756a;
    --line:#332e25;
    --red:#e64a3b;        /* a touch brighter to read on dark */
    --red-deep:#c23a2e;
  }
  /* sections that are dark in BOTH themes get a distinct near-black so they don't
     merge into the page; their light text already reads on it */
  .band{background:#0f0d09}
  footer{background:#0f0d09}
  .card.kernel{background:linear-gradient(180deg,#231f17,#191510)}
  .btn.solid:hover{background:var(--ink);filter:brightness(1.08)}
  .code,pre.result{border:1px solid var(--line)}
  .card:hover{box-shadow:0 18px 46px -22px rgba(0,0,0,.6)}
  img.hero-logo{filter:none}
}