/* ================= reset ================= */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}

/* ================= tokens ================= */
:root{
  --night-900:#071A2B;
  --night-800:#0E2C45;
  --night-700:#16405F;
  --mint:#2BE3B0;
  --mint-600:#17C79A;
  --amber:#FFB020;
  --amber-deep:#FF7A1A;
  --cold-white:#F2F6F8;
  --mist:#A9BFCC;
  --mint-50:#E8FBF4;
  --amber-50:#FFEAC2;

  --bg:var(--night-900);
  --bg-raised:var(--night-800);
  --bg-veil:rgba(7,26,43,.84);
  --surface:rgba(14,44,69,.55);
  --surface-solid:#0E2C45;
  --line:var(--night-700);
  --line-soft:rgba(169,191,204,.18);
  --text:var(--cold-white);
  --text-muted:var(--mist);
  --accent:var(--mint);
  --accent-soft:rgba(43,227,176,.14);
  --accent-line:rgba(43,227,176,.42);
  --accent-ink:#04141F;
  --warn:var(--amber);
  --warn-ink:#071A2B;
  --glow:rgba(43,227,176,.35);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","DIN Alternate","SFMono-Regular",Consolas,"Courier New",monospace;

  --r-pill:999px;
  --r-card:20px;
  --r-sm:10px;
  --shadow-1:0 24px 60px -42px rgba(0,0,0,.95);
  --shadow-2:0 44px 90px -62px rgba(0,0,0,1);
  --ease:160ms cubic-bezier(.2,.7,.3,1);
  --shell:1240px;
}

[data-theme="light"]{
  --bg:#F2F6F8;
  --bg-raised:#FFFFFF;
  --bg-veil:rgba(242,246,248,.9);
  --surface:#FFFFFF;
  --surface-solid:#FFFFFF;
  --line:#C7D8E2;
  --line-soft:rgba(7,26,43,.12);
  --text:#071A2B;
  --text-muted:#4A6879;
  --accent:var(--mint-600);
  --accent-soft:rgba(23,199,154,.14);
  --accent-line:rgba(23,199,154,.45);
  --accent-ink:#04141F;
  --warn-ink:#071A2B;
  --glow:rgba(23,199,154,.3);
  --shadow-1:0 22px 50px -38px rgba(7,26,43,.42);
  --shadow-2:0 40px 80px -60px rgba(7,26,43,.5);
}

/* ================= base ================= */
body{
  min-height:100vh;
  background-color:var(--bg);
  background-image:
    radial-gradient(1180px 600px at 88% -12%, rgba(43,227,176,.11), transparent 62%),
    radial-gradient(900px 520px at 4% 2%, rgba(255,176,32,.08), transparent 60%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
[data-theme="light"] body{
  background-image:
    radial-gradient(1100px 560px at 88% -12%, rgba(23,199,154,.16), transparent 62%),
    radial-gradient(820px 480px at 3% 1%, rgba(255,176,32,.14), transparent 60%);
}
::selection{background:var(--accent);color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}

h1,h2,h3,h4,.display{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-.02em;
  line-height:1.18;
  color:var(--text);
}
h1{font-size:clamp(32px,5.4vw,64px)}
h2{font-size:clamp(23px,3.1vw,32px)}
h3{font-size:clamp(18px,2vw,22px)}
h4{font-size:17px}

p{max-width:38em}
strong{font-weight:600}

/* ================= layout helpers ================= */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(16px,4vw,40px);
}
.section{padding-block:clamp(48px,8vw,96px)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--accent);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--accent);
}
.lede{
  font-size:clamp(16px,1.6vw,19px);
  line-height:1.8;
  color:var(--text-muted);
  max-width:34em;
}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-size:1.4em;
  font-weight:700;
  line-height:1.1;
  color:var(--amber);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}
.stat-label{
  display:block;
  font-size:12.5px;
  letter-spacing:.12em;
  color:var(--text-muted);
}
.link-mint{
  color:var(--accent);
  border-bottom:1px solid var(--accent-line);
  transition:color var(--ease),border-color var(--ease);
}
.link-mint:hover{color:var(--text);border-color:var(--text)}

.prose{max-width:38em}
.prose p{max-width:34em;margin-bottom:1.1em;color:var(--text)}
.prose h2{margin:1.7em 0 .6em}
.prose h3{margin:1.35em 0 .5em}
.prose ul{display:grid;gap:8px;margin:0 0 1.3em}
.prose li{position:relative;padding-left:20px;color:var(--text-muted);max-width:34em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:8px;
  height:2px;
  background:var(--accent);
}
.prose blockquote{
  margin:1.4em 0;
  padding:14px 18px;
  border-left:2px solid var(--amber);
  background:var(--surface);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  color:var(--text-muted);
}

/* ================= buttons ================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.2;
  transition:background-color var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-amber{background:var(--amber);color:var(--warn-ink)}
.btn-amber:hover{background:var(--amber-deep);color:var(--warn-ink)}
.btn-mint{background:var(--accent);color:var(--accent-ink)}
.btn-mint:hover{background:var(--mint-600);color:var(--accent-ink)}
.btn-line{border-color:var(--line);color:var(--text)}
.btn-line:hover{border-color:var(--accent-line);color:var(--accent);background:var(--accent-soft)}
.btn-compact{padding:8px 15px;font-size:13px}

/* ================= breadcrumbs ================= */
.breadcrumbs{padding-block:18px 0;font-size:13px}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs-item{display:flex;align-items:center;gap:8px;color:var(--text-muted)}
.breadcrumbs-item + .breadcrumbs-item::before{content:"/";color:var(--line)}
.breadcrumbs-link{color:var(--text-muted);transition:color var(--ease)}
.breadcrumbs-link:hover{color:var(--accent)}
.breadcrumbs-current{color:var(--text)}

/* ================= grid ================= */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.col-narrow{grid-column:1 / span 3}
.col-wide{grid-column:4 / span 8}
.col-full{grid-column:1 / -1}

/* ================= cards & tags ================= */
.card-paper{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--r-card);
  background:var(--surface);
  padding:clamp(20px,3vw,32px);
  box-shadow:var(--shadow-1);
}
.paper-tag{
  position:absolute;
  top:-11px;
  left:18px;
  padding:3px 10px;
  border-radius:4px;
  background:var(--amber);
  color:var(--warn-ink);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
}
.paper-stack{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--r-card);
  background:var(--surface);
  box-shadow:var(--shadow-2);
}
.paper-stack::before,
.paper-stack::after{
  content:"";
  position:absolute;
  inset:0;
  border:1px solid var(--line-soft);
  border-radius:calc(var(--r-card) + 2px);
  pointer-events:none;
}
.paper-stack::before{transform:translate(10px,10px)}
.paper-stack::after{transform:translate(20px,20px);opacity:.5}

/* ================= media frames ================= */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-card);
  background:linear-gradient(135deg, rgba(43,227,176,.12), rgba(255,176,32,.09)), var(--surface-solid);
  isolation:isolate;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size:46px 46px;
  pointer-events:none;
}
.media-frame > img,
.media-frame > video{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16 / 9}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--3x4{aspect-ratio:3 / 4}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-caption{
  margin-top:10px;
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--text-muted);
}

/* ================= skip link ================= */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  padding:10px 18px;
  border-radius:var(--r-pill);
  background:var(--accent);
  color:var(--accent-ink);
  font-size:14px;
  font-weight:600;
  transform:translateY(-180%);
  transition:transform var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* ================= header ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--bg-veil);
  border-bottom:1px solid var(--line-soft);
  backdrop-filter:blur(14px) saturate(1.2);
}
.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  z-index:2;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg, var(--accent), var(--amber));
  pointer-events:none;
}
.header-capsule-row{padding:14px 0 12px;transition:padding var(--ease)}
.capsule-shell{padding-inline:clamp(14px,3vw,32px)}

.capsule-nav{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(8px,1.6vw,22px);
  padding:8px 10px 8px 14px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  background:var(--surface);
  box-shadow:var(--shadow-1);
  backdrop-filter:blur(16px) saturate(1.3);
  transition:border-radius var(--ease),border-color var(--ease),padding var(--ease);
}

.brand-lockup{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:2px 4px;
  border-radius:var(--r-pill);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:0 0 auto;
  border-radius:10px;
  background:var(--accent);
  color:var(--accent-ink);
  font-family:var(--font-mono);
  font-size:16px;
  font-weight:700;
  box-shadow:0 0 0 1px var(--accent-line), 0 12px 26px -16px var(--glow);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{
  font-family:var(--font-display);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
}
.brand-tagline{
  font-size:11px;
  letter-spacing:.12em;
  color:var(--text-muted);
  transition:opacity var(--ease),visibility var(--ease);
}

.nav-list{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:2px;
  flex:1 1 auto;
}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 13px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:14px;
  color:var(--text-muted);
  transition:color var(--ease),background-color var(--ease),border-color var(--ease);
}
.nav-link:hover{
  color:var(--text);
  background:var(--accent-soft);
  border-color:var(--accent-line);
}
.nav-link[aria-current="page"]{
  color:var(--accent);
  background:var(--accent-soft);
  border-color:var(--accent-line);
  font-weight:600;
}
.nav-link[aria-current="page"]::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 4px var(--accent-soft);
}

.nav-utility{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  margin-left:auto;
}
.theme-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  font-size:13px;
  color:var(--text-muted);
  transition:color var(--ease),border-color var(--ease),background-color var(--ease);
}
.theme-toggle:hover{color:var(--text);border-color:var(--accent-line);background:var(--accent-soft)}
.theme-toggle-dot{
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 0 4px rgba(255,176,32,.18);
  transition:background-color var(--ease),box-shadow var(--ease);
}
.theme-toggle[aria-pressed="true"] .theme-toggle-dot{
  background:var(--accent);
  box-shadow:0 0 0 4px var(--accent-soft);
}
.theme-toggle-label{white-space:nowrap}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  font-size:13px;
  color:var(--text);
  transition:border-color var(--ease),background-color var(--ease);
}
.nav-toggle:hover{border-color:var(--accent-line);background:var(--accent-soft)}
.nav-toggle-text{white-space:nowrap}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  border-radius:2px;
  background:currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--ease),opacity var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.capsule-nav[data-open] .nav-toggle-bars{background:transparent}
.capsule-nav[data-open] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.capsule-nav[data-open] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}

/* entry bar */
.entry-bar{
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
  background:linear-gradient(90deg, var(--accent-soft) 0%, transparent 40%, rgba(255,176,32,.12) 100%);
}
.entry-bar-inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,22px);
  min-height:46px;
  overflow-x:auto;
  scrollbar-width:none;
}
.entry-bar-inner::-webkit-scrollbar{display:none}
.entry-label{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--text-muted);
  white-space:nowrap;
}
.entry-list{display:flex;align-items:center;gap:4px;flex:1 1 auto}
.entry-link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:7px 12px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:13.5px;
  color:var(--text);
  white-space:nowrap;
  transition:color var(--ease),background-color var(--ease),border-color var(--ease);
}
.entry-link:hover{
  color:var(--accent);
  background:var(--accent-soft);
  border-color:var(--accent-line);
}
.entry-num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--amber);
}
.entry-hint{
  margin-left:auto;
  flex:0 0 auto;
  font-size:12px;
  color:var(--text-muted);
  white-space:nowrap;
}

/* condensed header state */
.site-header[data-condensed] .header-capsule-row{padding:8px 0}
.site-header[data-condensed] .capsule-nav{padding-top:5px;padding-bottom:5px}
.site-header[data-condensed] .brand-tagline{opacity:0;visibility:hidden}

/* ================= footer ================= */
.site-footer{
  margin-top:clamp(72px,10vw,140px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, var(--surface), transparent 72%);
}
.footer-board{
  padding:clamp(40px,6vw,72px) clamp(20px,4vw,48px) clamp(26px,4vw,40px);
}
.footer-brand{
  display:flex;
  align-items:flex-start;
  gap:16px;
  padding-bottom:clamp(22px,3vw,34px);
  border-bottom:1px solid var(--line-soft);
}
.footer-mark{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  flex:0 0 auto;
  border-radius:14px;
  background:var(--accent);
  color:var(--accent-ink);
  font-family:var(--font-mono);
  font-size:20px;
  font-weight:700;
}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:600;
  letter-spacing:-.01em;
}
.footer-brand-line{
  font-size:14px;
  color:var(--text-muted);
  max-width:34em;
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
  padding:clamp(26px,4vw,44px) 0;
}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--accent);
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;
  width:fit-content;
  padding-bottom:1px;
  border-bottom:1px solid transparent;
  font-size:14.5px;
  color:var(--text-muted);
  transition:color var(--ease),border-color var(--ease);
}
.footer-link:hover{color:var(--accent);border-color:var(--accent-line)}
.footer-contact{
  display:grid;
  gap:8px;
  padding:clamp(20px,3vw,30px) 0;
  border-top:1px solid var(--line-soft);
}
.contact-line{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  max-width:none;
  font-size:14px;
  color:var(--text);
}
.contact-label{
  min-width:78px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--amber);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-top:20px;
  border-top:1px dashed var(--line-soft);
}
.legal-line{font-size:12.5px;color:var(--text-muted);max-width:none}
.footer-copyright{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--text-muted);
  max-width:none;
}

/* ================= reveal ================= */
.will-reveal{
  opacity:0;
  transform:translateY(8px);
  transition:opacity 420ms ease, transform 420ms ease;
}
.will-reveal.is-visible{opacity:1;transform:none}

/* ================= responsive ================= */
@media (max-width:1080px){
  .brand-tagline{opacity:0;visibility:hidden}
  .nav-link{padding:8px 10px;font-size:13.5px}
  .theme-toggle{padding:8px 10px}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-capsule-row{padding:10px 0}
  .capsule-nav{
    flex-wrap:wrap;
    border-radius:26px;
    padding:8px 10px;
  }
  .capsule-nav[data-open]{
    border-radius:22px;
    border-color:var(--accent-line);
  }
  .brand-lockup{flex:1 1 auto}
  .brand-tagline{opacity:1;visibility:visible}
  .nav-list{
    order:3;
    flex:1 1 100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:2px;
    margin-top:10px;
    padding-top:10px;
    border-top:1px solid var(--line-soft);
  }
  .capsule-nav[data-open] .nav-list{display:flex}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:11px 14px;
    border-radius:14px;
    font-size:15px;
    color:var(--text);
  }
  .entry-label{display:none}
  .entry-hint{display:none}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-narrow,.col-wide{grid-column:1 / -1}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:640px){
  .btn-compact{padding:8px 12px;font-size:12.5px}
  .theme-toggle{padding:8px}
  .theme-toggle-label{display:none}
  .entry-bar-inner{min-height:42px}
  .entry-link{font-size:13px;padding:6px 10px}
  .footer-grid{grid-template-columns:minmax(0,1fr);padding-block:clamp(20px,5vw,32px)}
  .footer-brand{flex-direction:column;gap:12px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .contact-label{min-width:auto}
  .paper-stack::before{transform:translate(6px,6px)}
  .paper-stack::after{transform:translate(12px,12px)}
  .media-frame--3x4{aspect-ratio:4 / 5}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .will-reveal{opacity:1;transform:none;transition:none}
  .btn:hover{transform:none}
}