/* =========================================================================
   ASIZ Institute — Plan D
   AI-for-science research institute · Flatiron/Allen/SFI + SpaceX gravitas
   Themeable: body[data-mode="hybrid"] (light) ⇄ body[data-mode="dark"]
   ========================================================================= */

/* ----------------------------------------------------------------- reset */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *,*::before,*::after { animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; } }
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
::selection { background: color-mix(in srgb, var(--accent) 26%, transparent); }

/* ----------------------------------------------- theme tokens (HYBRID/light) */
:root, body[data-mode="hybrid"] {
  --bg:        #ffffff;
  --surface:   #f6f8fb;
  --surface-2: #eef2f7;
  --border:    #e2e7ee;
  --border-2:  #d2dae4;
  --text:      #0d1320;
  --muted:     #545d6e;
  --faint:     #8a93a3;
  --accent:    #1c4fe0;
  --accent-ink:#ffffff;
  --shadow:    0 1px 2px rgba(15,23,42,.04), 0 12px 32px -12px rgba(15,23,42,.12);
  --shadow-lg: 0 2px 4px rgba(15,23,42,.05), 0 30px 60px -20px rgba(15,23,42,.22);
  color-scheme: light;
}
body[data-mode="dark"] {
  --bg:        #060709;
  --surface:   #0c0f15;
  --surface-2: #12151c;
  --border:    #232936;
  --border-2:  #313847;
  --text:      #eef2f7;
  --muted:     #9aa4b4;
  --faint:     #616b7c;
  --accent:    #6098ff;
  --accent-ink:#04101f;
  --shadow:    0 1px 2px rgba(0,0,0,.4), 0 16px 40px -16px rgba(0,0,0,.6);
  --shadow-lg: 0 2px 6px rgba(0,0,0,.5), 0 40px 80px -24px rgba(0,0,0,.7);
  color-scheme: dark;
}

/* shared (mode-independent) tokens */
:root {
  /* research-center hues — readable on light AND dark */
  --c-discovery: #2a5be6;
  --c-energy:    #e0763a;
  --c-living:    #1fa46f;
  --c-autonomy:  #1f9fc0;
  --c-matter:    #7b5cf0;
  --c-space:     #d24f8c;
  --c-mind:      #c08a1e;
  /* horizon arc (α→ζ) */
  --alpha: #1f93b8; --sigma: #1a9a6e; --iota: #6f55d8; --zeta: #c2851a;
  --c: var(--accent);

  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --container: 1280px;
  --wide: 1500px;
  --gutter: clamp(20px, 5vw, 64px);
  --section-y: clamp(72px, 9vw, 150px);
  --r: 6px; --r-lg: 14px; --r-xl: 22px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
  --nav-h: 70px;
}

/* ----------------------------------------------------------------- base */
html, body { background: var(--bg); }
body { font-family: var(--sans); color: var(--text); line-height: 1.62; font-size: 16.5px;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: hidden;
  transition: background .5s var(--ease), color .5s var(--ease); }
main, .site-footer { position: relative; z-index: 1; }
/* mysterious atmosphere — dark mode only */
body[data-mode="dark"]::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(120% 70% at 50% -8%, rgba(96,152,255,.07), transparent 55%),
    radial-gradient(100% 92% at 50% 120%, rgba(0,0,0,.55), transparent 62%);
}
body[data-mode="dark"]::after {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .045;
  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='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ----------------------------------------------------------- typography */
h1,h2,h3,h4 { font-family: var(--serif); font-weight: 500; line-height: 1.07; letter-spacing: -.015em; }
h1 { font-size: clamp(2.6rem, 5.6vw, 4.9rem); }
h2 { font-size: clamp(2rem, 4vw, 3.3rem); }
h3 { font-size: clamp(1.35rem, 2vw, 1.8rem); }
.serif { font-family: var(--serif); }
.lead { font-size: clamp(1.08rem, 1.5vw, 1.34rem); color: var(--muted); line-height: 1.6; max-width: 64ch; font-weight: 400; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--c); display: inline-flex; align-items: center; gap: 9px; }
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--c); }
.eyebrow.nb::before { display: none; }
.kicker { font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
.measure { max-width: 66ch; }

/* ----------------------------------------------------------- layout */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container.wide { max-width: var(--wide); }
.section { padding-block: var(--section-y); position: relative; }
.section.tight { padding-block: clamp(48px,6vw,88px); }
.rule { height: 1px; background: var(--border); border: 0; }
.sec-head { max-width: 64ch; }
.sec-head h2 { margin-top: 16px; }
.sec-head .lead { margin-top: 20px; }
.two-col { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(30px,5vw,84px); align-items: start; }
@media (max-width:880px){ .two-col { grid-template-columns: 1fr; } }
.body-copy p { color: var(--muted); } .body-copy p + p { margin-top: 16px; }

/* ----------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; gap: 9px; font-family: var(--sans); font-weight: 500; font-size: 15px;
  padding: 12px 22px; border-radius: 100px; border: 1px solid var(--border-2); color: var(--text); background: var(--bg);
  transition: border-color .3s, background .3s, color .3s, transform .3s, box-shadow .3s; }
.btn:hover { border-color: var(--text); transform: translateY(-1px); }
.btn .arr { transition: transform .3s var(--ease); }
.btn:hover .arr { transform: translate(3px,0); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 86%, #fff); border-color: transparent; box-shadow: var(--shadow); color: var(--accent-ink); }
.btn-ghost { border-color: transparent; padding-inline: 6px; }
.btn-ghost:hover { border-color: transparent; color: var(--accent); transform: none; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ----------------------------------------------------------- header */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--nav-h);
  transition: background .35s, border-color .35s, backdrop-filter .35s; border-bottom: 1px solid transparent; }
.site-header.scrolled { background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(16px) saturate(140%); -webkit-backdrop-filter: blur(16px) saturate(140%); border-bottom-color: var(--border); }
.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: .12em; font-size: 17px; font-family: var(--sans); }
.brand .mark { width: 26px; height: 26px; flex: none; }
.brand small { font-family: var(--mono); font-weight: 400; font-size: 10px; letter-spacing: .14em; color: var(--faint); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a { font-size: 14.5px; font-weight: 500; color: var(--muted); padding: 8px 13px; border-radius: 8px; transition: color .25s, background .25s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--surface); }
.nav-right { display: flex; align-items: center; gap: 10px; }
.mode-toggle { display: inline-flex; align-items: center; gap: 7px; border: 1px solid var(--border-2); border-radius: 100px; padding: 6px 12px 6px 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); transition: border-color .25s, color .25s; }
.mode-toggle:hover { border-color: var(--text); color: var(--text); }
.mode-toggle .ic { width: 14px; height: 14px; }
.nav-toggle { display: none; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--border-2); border-radius: 8px; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { content:""; display:block; width: 17px; height: 1.6px; background: var(--text); transition: .3s; }
.nav-toggle span { position: relative; } .nav-toggle span::before { position:absolute; top:-5px; } .nav-toggle span::after { position:absolute; top:5px; }
.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { top:0; transform: rotate(45deg); } .nav-open .nav-toggle span::after { top:0; transform: rotate(-45deg); }
@media (max-width: 980px){
  .nav-toggle { display: flex; }
  .nav-links { position: fixed; top: var(--nav-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 10px var(--gutter) 22px; transform: translateY(-10px); opacity: 0; pointer-events: none; transition: .3s var(--ease); }
  .nav-open .nav-links { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 14px 6px; font-size: 16px; border-bottom: 1px solid var(--border); border-radius: 0; }
  .nav-right .btn-primary { display: none; }
}

/* ----------------------------------------------------------- hero */
.hero { position: relative; padding-top: calc(var(--nav-h) + clamp(40px,7vw,90px)); padding-bottom: clamp(40px,6vw,80px); overflow: hidden; }
.hero .container { position: relative; z-index: 2; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(30px,5vw,70px); align-items: center; }
@media (max-width: 940px){ .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { margin-top: 22px; max-width: 15ch; }
.hero h1 .em { color: var(--accent); font-style: italic; }
.hero-sub { margin-top: 26px; max-width: 54ch; font-size: clamp(1.08rem,1.5vw,1.32rem); color: var(--muted); }
.hero-actions { margin-top: 32px; }
.hero-figure { position: relative; aspect-ratio: 1/1; border-radius: var(--r-xl); overflow: hidden; border: 1px solid var(--border);
  background: radial-gradient(120% 120% at 70% 20%, color-mix(in srgb,var(--accent) 14%, var(--surface)), var(--surface)); box-shadow: var(--shadow-lg); }
.hero-figure canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-figure .fig-cap { position: absolute; left: 14px; bottom: 12px; z-index: 2; font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.hero-figure .fig-tag { position: absolute; right: 14px; top: 12px; z-index: 2; font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); padding: 4px 9px; border-radius: 100px; }
.hero-metrics { display: flex; flex-wrap: wrap; gap: clamp(20px,3vw,44px); margin-top: 40px; padding-top: 30px; border-top: 1px solid var(--border); }
.hero-metrics .m .n { font-family: var(--serif); font-size: clamp(1.7rem,2.6vw,2.3rem); font-weight: 500; letter-spacing: -.02em; }
.hero-metrics .m .l { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); margin-top: 5px; }

/* ----------------------------------------------------------- logos/partners strip */
.strip { border-block: 1px solid var(--border); background: var(--surface); }
.strip .container { display: flex; align-items: center; gap: clamp(20px,4vw,56px); flex-wrap: wrap; padding-block: 22px; }
.strip .lab { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.strip .partners { display: flex; gap: clamp(18px,3vw,40px); flex-wrap: wrap; align-items: center; }
.strip .partners span { font-weight: 600; color: var(--muted); letter-spacing: .01em; font-size: 15px; opacity: .85; }

/* ----------------------------------------------------------- the method (loop) */
.method-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(30px,5vw,72px); align-items: center; }
@media (max-width: 920px){ .method-grid { grid-template-columns: 1fr; } }
.loop { position: relative; aspect-ratio: 1/1; max-width: 480px; margin-inline: auto; width: 100%; }
.loop canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.steps { display: grid; gap: 14px; }
.step { display: grid; grid-template-columns: 46px 1fr; gap: 18px; padding: 20px; border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--bg); transition: border-color .3s, background .3s, transform .3s; }
.step:hover { border-color: var(--border-2); transform: translateX(3px); }
.step .no { font-family: var(--mono); font-size: 13px; color: var(--accent); border: 1px solid var(--border-2); border-radius: 8px; height: 40px; display: grid; place-items: center; }
.step h3 { font-family: var(--sans); font-weight: 650; font-size: 1.12rem; letter-spacing: -.01em; }
.step p { color: var(--muted); font-size: 14.5px; margin-top: 6px; }

/* ----------------------------------------------------------- centers grid */
.centers { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
@media (max-width: 980px){ .centers { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px){ .centers { grid-template-columns: 1fr; } }
.center { border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--bg); overflow: hidden; transition: border-color .3s, transform .35s, box-shadow .35s; display: flex; flex-direction: column; }
.center:hover { border-color: var(--border-2); transform: translateY(-3px); box-shadow: var(--shadow); }
.center .fig { aspect-ratio: 16/9; position: relative; overflow: hidden; border-bottom: 1px solid var(--border);
  background: radial-gradient(120% 130% at 75% 15%, color-mix(in srgb, var(--c) 20%, var(--surface)), var(--surface)); }
.center .fig canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.center .bd { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.center .hz { display: flex; gap: 6px; margin-bottom: 12px; }
.center .hz span { font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; padding: 3px 7px; border-radius: 100px; border: 1px solid var(--border-2); color: var(--faint); }
.center h3 { font-family: var(--sans); font-weight: 650; font-size: 1.18rem; letter-spacing: -.01em; }
.center h3 .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--c); margin-right: 9px; vertical-align: middle; }
.center p { color: var(--muted); font-size: 14px; margin-top: 10px; flex: 1; }
.center .tags { margin-top: 16px; font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: .02em; }
.center .more { margin-top: 16px; font-size: 13.5px; font-weight: 600; color: var(--c); display: inline-flex; gap: 7px; }
.center[data-c="discovery"]{--c:var(--c-discovery);} .center[data-c="energy"]{--c:var(--c-energy);}
.center[data-c="living"]{--c:var(--c-living);} .center[data-c="autonomy"]{--c:var(--c-autonomy);}
.center[data-c="matter"]{--c:var(--c-matter);} .center[data-c="space"]{--c:var(--c-space);} .center[data-c="mind"]{--c:var(--c-mind);}

/* ----------------------------------------------------------- horizons roadmap */
.horizons { border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; background: var(--bg); }
.hz-row { display: grid; grid-template-columns: 120px 1fr; gap: clamp(16px,3vw,40px); padding: clamp(20px,2.4vw,30px) clamp(20px,2.6vw,34px); border-top: 1px solid var(--border); align-items: start; }
.hz-row:first-child { border-top: 0; }
.hz-row .lab { }
.hz-row .gl { font-family: var(--serif); font-size: clamp(2rem,3vw,2.6rem); color: var(--g); line-height: 1; }
.hz-row .yr { font-family: var(--mono); font-size: 11.5px; color: var(--muted); margin-top: 6px; letter-spacing: .04em; }
.hz-row .nm { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin-top: 4px; }
.hz-row h3 { font-family: var(--sans); font-weight: 650; font-size: 1.15rem; }
.hz-row p { color: var(--muted); font-size: 14.5px; margin-top: 8px; max-width: 70ch; }
.hz-row .chips { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 7px; }
.hz-row .chips span { font-family: var(--mono); font-size: 11px; color: var(--muted); border: 1px solid var(--border); border-radius: 100px; padding: 5px 11px; }
.hz-row.a { --g: var(--alpha); } .hz-row.s { --g: var(--sigma); } .hz-row.i { --g: var(--iota); } .hz-row.z { --g: var(--zeta); }
@media (max-width: 640px){ .hz-row { grid-template-columns: 1fr; gap: 12px; } }

/* ----------------------------------------------------------- band (cinematic dark) */
.band { position: relative; overflow: hidden;
  --bg:#080a0e; --surface:#11151c; --surface-2:#171c25; --border:#222834; --border-2:#313847; --text:#f1f4f8; --muted:#9aa4b4; --faint:#5f6877;
  background: var(--bg); color: var(--text); border-block: 1px solid #1a1f29; }
.band canvas.bandviz { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: .9; }
.band .scrim { position: absolute; inset: 0; z-index: 1; background: linear-gradient(to right, var(--bg) 8%, color-mix(in srgb,var(--bg) 55%, transparent) 50%, transparent 90%), linear-gradient(to top, var(--bg), transparent 40%); }
.band .container { position: relative; z-index: 2; }
.band h2 { color: #fff; max-width: 18ch; }
.band .lead { color: #c7ced9; }

/* ----------------------------------------------------------- publications / news */
.pub-list { border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; background: var(--bg); }
.pub { display: grid; grid-template-columns: 92px 1fr auto; gap: clamp(14px,2vw,28px); padding: 20px clamp(18px,2.4vw,28px); border-top: 1px solid var(--border); align-items: baseline; transition: background .3s; }
.pub:first-child { border-top: 0; } .pub:hover { background: var(--surface); }
.pub .date { font-family: var(--mono); font-size: 12px; color: var(--faint); }
.pub .ti { font-weight: 600; font-size: 1.02rem; letter-spacing: -.01em; }
.pub .au { color: var(--muted); font-size: 13.5px; margin-top: 4px; }
.pub .venue { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--c, var(--accent)); white-space: nowrap; }
@media (max-width: 720px){ .pub { grid-template-columns: 1fr; gap: 6px; } .pub .venue { justify-self: start; } }

.news-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
@media (max-width: 900px){ .news-grid { grid-template-columns: 1fr; } }
.news { border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; background: var(--bg); transition: transform .35s, box-shadow .35s, border-color .3s; display: flex; flex-direction: column; }
.news:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--border-2); }
.news .fig { aspect-ratio: 16/9; position: relative; border-bottom: 1px solid var(--border); background: var(--surface); overflow: hidden; }
.news .fig canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.news .bd { padding: 20px; }
.news .k { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); }
.news h3 { font-family: var(--sans); font-weight: 650; font-size: 1.1rem; margin-top: 10px; letter-spacing: -.01em; }

/* ----------------------------------------------------------- open science / tools */
.tools { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
@media (max-width: 820px){ .tools { grid-template-columns: 1fr; } }
.tool { border: 1px solid var(--border); border-radius: var(--r-lg); padding: 24px; background: var(--bg); transition: border-color .3s, transform .3s; }
.tool:hover { border-color: var(--border-2); transform: translateY(-2px); }
.tool .ic { width: 26px; height: 26px; color: var(--accent); margin-bottom: 16px; }
.tool h3 { font-family: var(--sans); font-weight: 650; font-size: 1.1rem; }
.tool p { color: var(--muted); font-size: 14px; margin-top: 8px; }
.tool .lk { margin-top: 14px; font-family: var(--mono); font-size: 12px; color: var(--accent); }

/* ----------------------------------------------------------- people */
.people { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }
@media (max-width: 900px){ .people { grid-template-columns: 1fr 1fr; } }
.person { }
.person .av { aspect-ratio: 1/1; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--border); position: relative; background: var(--surface); }
.person .av canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.person .av .mono { position: absolute; right: 10px; bottom: 8px; font-family: var(--mono); font-size: 10px; color: var(--faint); letter-spacing: .08em; }
.person .av .ini { position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--serif); font-size: 2.3rem; font-weight: 500; color: #fff; opacity: .94; letter-spacing: .02em; }
.person h3 { font-family: var(--sans); font-weight: 650; font-size: 1.05rem; margin-top: 14px; }
.person .role { color: var(--muted); font-size: 13.5px; margin-top: 3px; }
.person .ctr { font-family: var(--mono); font-size: 11px; letter-spacing: .04em; color: var(--c, var(--accent)); margin-top: 8px; }

/* ----------------------------------------------------------- stat band */
.stats { display: grid; grid-template-columns: repeat(4,1fr); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; background: var(--bg); }
.stat { padding: clamp(24px,3vw,38px); border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat .n { font-family: var(--serif); font-weight: 500; font-size: clamp(2rem,4vw,3rem); letter-spacing: -.02em; }
.stat .l { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-top: 10px; }
@media (max-width: 760px){ .stats { grid-template-columns: 1fr 1fr; } .stat:nth-child(2){border-right:0;} .stat:nth-child(-n+2){border-bottom:1px solid var(--border);} }

/* ----------------------------------------------------------- CTA */
.cta { text-align: center; }
.cta h2 { max-width: 20ch; margin-inline: auto; }
.cta .lead { margin: 22px auto 0; }
.cta .btn-row { justify-content: center; margin-top: 34px; }

/* ----------------------------------------------------------- page hero (sub) */
.page-hero { padding-top: calc(var(--nav-h) + clamp(56px,9vw,120px)); padding-bottom: clamp(30px,4vw,56px); border-bottom: 1px solid var(--border); position: relative; }
.crumb { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); display: flex; gap: 9px; }
.crumb a:hover { color: var(--text); } .crumb .sep { color: var(--border-2); }
.page-hero h1 { margin-top: 16px; }
.page-hero .lead { margin-top: 20px; }

/* ----------------------------------------------------------- forms */
.form { display: grid; gap: 16px; max-width: 520px; }
.field label { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); display: block; margin-bottom: 7px; }
.field input, .field textarea, .field select { width: 100%; background: var(--surface); border: 1px solid var(--border-2); border-radius: 8px; color: var(--text); padding: 13px 15px; font-family: var(--sans); font-size: 15px; transition: border-color .25s, background .25s; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--accent); }
.field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 13px; color: var(--faint); }

/* facts */
.facts { display: grid; gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.fact { background: var(--bg); display: grid; grid-template-columns: 210px 1fr; gap: 24px; padding: 20px 26px; align-items: baseline; }
.fact .k { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); }
.fact .v { color: var(--text); }
@media (max-width: 640px){ .fact { grid-template-columns: 1fr; gap: 6px; } }

/* ----------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding-block: clamp(50px,6vw,84px) 34px; }
.footer-top { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 36px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand p { color: var(--muted); max-width: 38ch; font-size: 14px; }
.footer-col h5 { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin-bottom: 14px; }
.footer-col a { display: block; color: var(--muted); font-size: 14px; padding: 6px 0; transition: color .25s; }
.footer-col a:hover { color: var(--text); }
.footer-rule { height: 1px; background: var(--border); margin: 40px 0 24px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; font-family: var(--mono); font-size: 11.5px; letter-spacing: .04em; color: var(--faint); }
@media (max-width: 820px){ .footer-top { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1/-1; } }

/* ----------------------------------------------------------- reveal */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .9s var(--ease-out), transform .9s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
.reveal-d1{transition-delay:.07s;} .reveal-d2{transition-delay:.14s;} .reveal-d3{transition-delay:.21s;} .reveal-d4{transition-delay:.28s;}

[id]{ scroll-margin-top: calc(var(--nav-h) + 18px); }

/* ---- systems index (74 technologies) ---- */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.filter { font-family: var(--mono); font-size: 12px; letter-spacing: .04em; padding: 9px 15px; border: 1px solid var(--border-2); border-radius: 100px; color: var(--muted); transition: .25s; }
.filter:hover { color: var(--text); border-color: var(--text); }
.filter.active { background: var(--text); color: var(--bg); border-color: var(--text); }
.filter[data-f="alpha"].active { background: var(--alpha); border-color: var(--alpha); color: #04121c; }
.filter[data-f="sigma"].active { background: var(--sigma); border-color: var(--sigma); color: #04121c; }
.filter[data-f="iota"].active  { background: var(--iota);  border-color: var(--iota);  color: #0a1030; }
.filter[data-f="zeta"].active  { background: var(--zeta);  border-color: var(--zeta);  color: #241600; }
.sys-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; margin-top: 26px; }
.sys { padding: 20px; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); transition: background .3s, opacity .35s, filter .35s; display: block; }
.sys:hover { background: var(--surface); }
.sys .field { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.sys h4 { font-family: var(--sans); font-weight: 600; font-size: 1.02rem; margin-top: 9px; letter-spacing: -.01em; }
.sys .lv { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.sys .lv .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; box-shadow: 0 0 6px currentColor; }
.sys[data-level="alpha"] .lv { color: var(--alpha); } .sys[data-level="sigma"] .lv { color: var(--sigma); }
.sys[data-level="iota"] .lv { color: var(--iota); } .sys[data-level="zeta"] .lv { color: var(--zeta); }
.sys.fade { opacity: .12; filter: grayscale(.7); pointer-events: none; }
@media (max-width: 560px){ .sys-grid { grid-template-columns: 1fr 1fr; } }