/* =========================================================================
   SMX — Synaptic Membrane Science
   Design system: fluorescence-microscopy palette, lipid-bilayer signature
   ========================================================================= */

:root {
  /* Light "lab paper" surfaces */
  --core:        #F6F8FC;   /* page background   */
  --core-2:      #FFFFFF;   /* panels            */
  --surface:     #FFFFFF;   /* raised cards      */
  --surface-2:   #EEF2FA;   /* tinted panels     */
  --line:        rgba(26, 42, 84, 0.12);
  --line-strong: rgba(26, 42, 84, 0.22);

  /* Phospholipid fluorescence stains — deepened for contrast on white */
  --gold:   #B5820E;   /* lipid tails      */
  --cyan:   #0E9E8E;   /* aqueous / fluid  */
  --magenta:#D9337C;   /* synaptic signal  */
  --violet: #6C5CE0;   /* receptor         */

  /* Ink */
  --ink:       #101828;
  --ink-soft:  #3B475C;
  --ink-mute:  #667085;
  --ink-faint: #98A2B3;

  /* Type */
  --display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --body:    "Spline Sans", ui-sans-serif, system-ui, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SF Mono", monospace;

  --maxw: 1180px;
  --gut:  clamp(20px, 5vw, 64px);

  --oil: linear-gradient(100deg, var(--cyan) 0%, var(--violet) 42%, var(--magenta) 72%, var(--gold) 100%);
}

/* --------------------------------------------------------------- reset -- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--body);
  background: var(--core);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ambient membrane wash behind everything */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(120% 80% at 12% -10%, rgba(14,158,142,0.09), transparent 55%),
    radial-gradient(90% 70% at 92% 8%, rgba(217,51,124,0.07), transparent 55%),
    radial-gradient(100% 90% at 50% 110%, rgba(108,92,224,0.08), transparent 60%);
  pointer-events: none;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.04; letter-spacing: -0.02em; margin: 0; }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gut); }

/* --------------------------------------------------------------- eyebrow */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: inline-flex; align-items: center; gap: 0.7em;
}
.eyebrow::before {
  content: ""; width: 26px; height: 1px;
  background: var(--oil);
}

.oil-text {
  background: var(--oil);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* --------------------------------------------------------------- header */
.site-head {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(255,255,255,0.78);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand .glyph { width: 30px; height: 30px; flex: none; }
.brand .word {
  font-family: var(--display); font-weight: 700; font-size: 1.15rem;
  letter-spacing: 0.02em;
}
.brand .word small {
  display: block; font-family: var(--mono); font-weight: 400;
  font-size: 0.56rem; letter-spacing: 0.24em; color: var(--ink-mute);
  margin-top: -2px; text-transform: uppercase;
}

.nav { display: flex; align-items: center; gap: clamp(6px, 1.6vw, 22px); }
.nav a {
  font-size: 0.88rem; color: var(--ink-soft); padding: 8px 2px;
  position: relative; transition: color .2s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px;
  height: 2px; background: var(--oil); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink); }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line-strong);
  color: var(--ink); border-radius: 10px; padding: 8px 12px; cursor: pointer;
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.1em;
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }
  .nav {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--line);
    padding: 8px var(--gut) 18px;
    clip-path: inset(0 0 100% 0); transition: clip-path .3s ease;
  }
  .nav[data-open="true"] { clip-path: inset(0 0 0 0); }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav a::after { display: none; }
}

/* --------------------------------------------------------------- hero */
.hero { position: relative; padding: clamp(56px, 9vw, 120px) 0 clamp(40px, 6vw, 76px); }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(28px, 5vw, 60px);
  align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 {
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  margin-top: 22px;
}
.hero .lede {
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  color: var(--ink-soft); max-width: 46ch; margin-top: 26px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

/* membrane canvas panel */
.membrane-panel {
  position: relative; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, var(--surface), var(--core));
  box-shadow: 0 30px 70px -46px rgba(16,24,40,0.35), inset 0 1px 0 rgba(255,255,255,0.6);
  aspect-ratio: 5 / 4;
  min-height: 300px;
}
.membrane-panel canvas { width: 100%; height: 100%; display: block; }
.membrane-panel .readout {
  position: absolute; left: 16px; bottom: 14px; right: 16px;
  display: flex; justify-content: space-between; align-items: flex-end;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.14em;
  color: var(--ink-mute); text-transform: uppercase; pointer-events: none;
}
.membrane-panel .readout b { color: var(--cyan); font-weight: 500; }

/* --------------------------------------------------------------- buttons */
.btn {
  --bg: var(--ink);
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--display); font-weight: 500; font-size: 0.95rem;
  padding: 13px 22px; border-radius: 12px; cursor: pointer;
  border: 1px solid transparent; transition: transform .18s ease, box-shadow .25s ease, background .2s;
}
.btn .arrow { transition: transform .2s ease; }
.btn:hover .arrow { transform: translateX(4px); }
.btn-primary {
  color: #fff; background: var(--oil); background-size: 160% 160%;
  box-shadow: 0 14px 40px -16px rgba(14,158,142,0.45);
}
.btn-primary:hover { transform: translateY(-2px); background-position: 100% 0; }
.btn-ghost {
  color: var(--ink); background: transparent; border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--cyan); transform: translateY(-2px); }

/* --------------------------------------------------------------- sections */
.section { padding: clamp(56px, 9vw, 108px) 0; position: relative; }
.section-head { max-width: 62ch; margin-bottom: clamp(34px, 5vw, 56px); }
.section-head h2 { font-size: clamp(1.9rem, 4vw, 3.1rem); margin-top: 18px; }
.section-head p { color: var(--ink-soft); font-size: 1.08rem; margin-top: 18px; }

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

/* --------------------------------------------------------------- pillars */
.pillars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
@media (max-width: 900px) { .pillars { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
  background: var(--core-2); padding: 30px 26px 34px; position: relative;
  transition: background .3s ease; display: block;
}
.pillar:hover { background: var(--surface); }
.pillar .idx { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); letter-spacing: 0.2em; }
.pillar h3 { font-size: 1.35rem; margin: 18px 0 10px; }
.pillar p { color: var(--ink-mute); font-size: 0.95rem; margin: 0; }
.pillar .go { margin-top: 20px; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.14em; color: var(--cyan); text-transform: uppercase; display: inline-flex; gap: 8px; }
.pillar .go .arrow { transition: transform .2s; }
.pillar:hover .go .arrow { transform: translateX(4px); }
.pillar::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent, var(--cyan)); opacity: 0; transition: opacity .3s;
}
.pillar:hover::before { opacity: 1; }

/* --------------------------------------------------------------- feature rows */
.feature {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 6vw, 72px);
  align-items: center; padding: clamp(38px, 6vw, 64px) 0;
}
.feature:nth-child(even) .feature-visual { order: -1; }
@media (max-width: 860px) {
  .feature { grid-template-columns: 1fr; }
  .feature:nth-child(even) .feature-visual { order: 0; }
}
.feature h3 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: 16px; }
.feature p { color: var(--ink-soft); }
.feature .kicker { font-family: var(--mono); color: var(--cyan); font-size: 0.74rem; letter-spacing: 0.2em; text-transform: uppercase; }

.diagram {
  border: 1px solid var(--line-strong); border-radius: 18px;
  background: radial-gradient(120% 120% at 30% 0%, var(--surface-2), var(--core));
  padding: 30px; min-height: 300px; position: relative; overflow: hidden;
}

/* --------------------------------------------------------------- data list */
.spec-list { list-style: none; margin: 26px 0 0; padding: 0; }
.spec-list li {
  display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: baseline;
  padding: 16px 0; border-top: 1px solid var(--line);
}
.spec-list li .k { font-family: var(--mono); font-size: 0.78rem; color: var(--gold); letter-spacing: 0.08em; white-space: nowrap; }
.spec-list li .v { color: var(--ink-soft); }

/* --------------------------------------------------------------- stat band */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border-block: 1px solid var(--line); }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--core); padding: 34px 26px; }
.stat .num { font-family: var(--display); font-weight: 700; font-size: clamp(2.2rem, 5vw, 3.2rem); letter-spacing: -0.03em; }
.stat .num.c { color: var(--cyan); } .stat .num.m { color: var(--magenta); } .stat .num.g { color: var(--gold); } .stat .num.v { color: var(--violet); }
.stat .cap { color: var(--ink-mute); font-size: 0.92rem; margin-top: 8px; }

/* --------------------------------------------------------------- cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: linear-gradient(180deg, var(--surface), var(--core-2));
  border: 1px solid var(--line); border-radius: 16px; padding: 28px;
  transition: transform .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.card .tag { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-faint); }
.card h3 { font-size: 1.25rem; margin: 14px 0 10px; }
.card p { color: var(--ink-mute); font-size: 0.95rem; margin: 0; }
.card .dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; margin-right: 8px; vertical-align: middle; }

/* --------------------------------------------------------------- integrity meter */
.meter-wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(28px,5vw,54px); align-items: center; }
@media (max-width: 860px) { .meter-wrap { grid-template-columns: 1fr; } }
.gauge { text-align: center; }
.gauge .ring { position: relative; width: min(320px, 78vw); margin-inline: auto; }
.gauge svg { transform: rotate(-90deg); width: 100%; height: auto; }
.gauge .val { position: absolute; inset: 0; display: grid; place-content: center; }
.gauge .val b { font-family: var(--display); font-size: clamp(2.6rem,8vw,3.6rem); font-weight: 700; letter-spacing: -0.03em; }
.gauge .val span { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--ink-mute); text-transform: uppercase; }
.factor-list { list-style: none; margin: 0; padding: 0; }
.factor-list li { padding: 14px 0; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 14px; cursor: pointer; }
.factor-list li:hover { color: var(--ink); }
.factor-list li .swatch { width: 34px; height: 34px; border-radius: 9px; flex: none; display: grid; place-content: center; font-family: var(--mono); font-size: 0.8rem; font-weight: 600; color: #fff; }
.factor-list li .txt b { display: block; font-family: var(--display); }
.factor-list li .txt small { color: var(--ink-mute); }

/* --------------------------------------------------------------- timeline */
.timeline { position: relative; margin-top: 30px; }
.timeline::before { content: ""; position: absolute; left: 15px; top: 6px; bottom: 6px; width: 2px; background: var(--oil); opacity: 0.5; }
.tl-item { position: relative; padding: 0 0 34px 54px; }
.tl-item .dot { position: absolute; left: 7px; top: 4px; width: 18px; height: 18px; border-radius: 50%; background: var(--core); border: 2px solid var(--cyan); box-shadow: 0 0 0 4px rgba(94,234,212,0.12); }
.tl-item .age { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em; color: var(--gold); }
.tl-item h3 { font-size: 1.3rem; margin: 8px 0 8px; }
.tl-item p { color: var(--ink-soft); margin: 0; max-width: 60ch; }

/* --------------------------------------------------------------- callout / cta */
.cta {
  border: 1px solid var(--line-strong); border-radius: 22px; overflow: hidden;
  background: radial-gradient(130% 120% at 0% 0%, rgba(94,234,212,0.10), transparent 55%),
              radial-gradient(130% 120% at 100% 100%, rgba(255,107,157,0.10), transparent 55%),
              var(--core-2);
  padding: clamp(38px, 6vw, 68px);
  text-align: center;
}
.cta h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
.cta p { color: var(--ink-soft); max-width: 54ch; margin: 18px auto 30px; }

/* --------------------------------------------------------------- footer */
.site-foot { border-top: 1px solid var(--line); padding: 54px 0 40px; margin-top: 40px; }
.foot-grid { display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; align-items: flex-start; }
.foot-grid .col-links { display: flex; gap: clamp(20px, 5vw, 60px); flex-wrap: wrap; }
.foot-grid h4 { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px; }
.foot-grid a { display: block; color: var(--ink-mute); font-size: 0.92rem; padding: 5px 0; }
.foot-grid a:hover { color: var(--cyan); }
.foot-bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; color: var(--ink-faint); font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; }
.disclaimer { color: var(--ink-faint); font-size: 0.78rem; max-width: 62ch; margin-top: 12px; line-height: 1.5; }

/* --------------------------------------------------------------- reveal */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* --------------------------------------------------------------- misc */
::selection { background: rgba(14,158,142,0.22); color: var(--ink); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.page-tag { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--ink-faint); text-transform: uppercase; }
.lead-para { font-size: clamp(1.1rem, 2vw, 1.35rem); color: var(--ink-soft); max-width: 60ch; line-height: 1.6; }
strong.hl { color: var(--ink); font-weight: 600; }
.chem { font-family: var(--mono); color: var(--gold); }