/* ==========================================================================
   ETC Labs — Gen 1 · Base: reset, typography, layout primitives, reveal, intro
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); background: var(--bg); }
body { margin: 0; background: var(--bg); color: var(--text); font: var(--fs-base)/1.6 var(--font-body); -webkit-font-smoothing: antialiased; overflow-x: hidden; min-height: 100vh; }
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.08; letter-spacing: -0.025em; margin: 0 0 0.5em; color: var(--text); text-wrap: balance; }
h1 { font-size: var(--fs-h1); font-weight: 700; letter-spacing: -0.035em; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: 1.3; letter-spacing: -0.015em; }
h4 { font-size: var(--fs-lg); line-height: 1.3; }
.display { font-size: var(--fs-display); font-weight: 700; letter-spacing: -0.04em; line-height: 0.98; }
p { margin: 0 0 1em; } p:last-child { margin-bottom: 0; }
.lead { font-size: clamp(1.05rem, 1rem + 0.35vw, 1.25rem); color: var(--text-2); line-height: 1.6; max-width: 58ch; }
.muted { color: var(--muted); } .small { font-size: var(--fs-sm); } .mono { font-family: var(--font-mono); }
.measure { max-width: 62ch; }
.grad { background: var(--g-energy); -webkit-background-clip: text; background-clip: text; color: transparent; }
.grad-cyan { background: var(--g-cyan-blue); -webkit-background-clip: text; background-clip: text; color: transparent; }
.grad-magenta { background: var(--g-violet-magenta); -webkit-background-clip: text; background-clip: text; color: transparent; }

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #7de9f8; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-sm); }
::selection { background: rgba(var(--cyan-rgb), 0.35); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 2000; padding: 10px 16px; border-radius: var(--r-md); background: var(--cyan); color: #04141a; font-weight: 600; transform: translateY(-200%); transition: transform var(--t-base) var(--ease); }
.skip-link:focus { transform: translateY(0); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
main { position: relative; z-index: 1; }
.section { position: relative; padding-block: var(--section); }
.section.tight { padding-block: calc(var(--section) * 0.55); }
.section.flush { padding-top: 0; }
.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 1023px) { .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 719px) { .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); } }
.split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: clamp(28px, 5vw, 80px); align-items: center; }
.split.top { align-items: start; }
@media (max-width: 899px) { .split { grid-template-columns: minmax(0, 1fr); } }
.stack > * + * { margin-top: var(--stack, 16px); }
.cluster { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.center { text-align: center; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 40px; } .mt-5 { margin-top: 64px; }
hr.rule { border: 0; height: 1px; margin: 0; background: var(--line); }

/* Section header */
.head { margin-bottom: clamp(28px, 4vw, 52px); }
.head.split-head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: 16px 56px; align-items: end; }
@media (max-width: 899px) { .head.split-head { grid-template-columns: minmax(0, 1fr); } }
.kicker { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--muted); margin-bottom: 14px; letter-spacing: 0.02em; }
.kicker::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: rgb(var(--tone-rgb)); box-shadow: 0 0 10px rgb(var(--tone-rgb)); }
.kicker.plain::before { display: none; }

/* Divided list */
.rows { border-top: 1px solid var(--line); }
.row { display: grid; grid-template-columns: 56px minmax(0, 1fr) auto; gap: 14px 24px; align-items: start; padding: 22px 0; border-bottom: 1px solid var(--line); color: inherit; transition: background var(--t-base); }
a.row:hover { background: linear-gradient(90deg, rgba(var(--tone-rgb), 0.06), transparent 60%); }
.row .num { font-family: var(--font-mono); font-size: var(--fs-xs); color: rgb(var(--tone-rgb)); padding-top: 5px; }
.row h3 { margin-bottom: 4px; }
.row p { color: var(--muted); font-size: 0.95rem; max-width: 60ch; }
.row .end { padding-top: 4px; }
@media (max-width: 599px) { .row { grid-template-columns: 40px minmax(0, 1fr); } .row .end { display: none; } }

/* Trio: three open columns */
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; }
.trio > * { padding: 8px 28px 8px 0; margin-right: 28px; border-right: 1px solid var(--line); }
.trio > *:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.trio h3 { font-size: 1.05rem; margin-bottom: 6px; }
.trio p { color: var(--muted); font-size: 0.94rem; }
@media (max-width: 799px) { .trio { grid-template-columns: minmax(0, 1fr); } .trio > * { padding: 18px 0; margin: 0; border-right: 0; border-bottom: 1px solid var(--line); } .trio > *:last-child { border-bottom: 0; } }

/* ---------- Reveal (transform + opacity only) ---------- */
[data-reveal] { opacity: 0; transform: translate3d(0, 14px, 0); transition: opacity var(--t-slow) var(--ease-out), transform var(--t-slow) var(--ease-out); transition-delay: calc(var(--i, 0) * 50ms); will-change: opacity, transform; }
[data-reveal="left"] { transform: translate3d(-18px, 0, 0); }
[data-reveal="right"] { transform: translate3d(18px, 0, 0); }
[data-reveal="scale"] { transform: scale(0.97); }
[data-reveal].in { opacity: 1; transform: none; will-change: auto; }
/* Line-by-line text reveal for heroes */
.lines > span { display: block; overflow: hidden; }
.lines > span > span { display: block; transform: translate3d(0, 110%, 0); transition: transform 0.9s var(--ease-out); transition-delay: calc(var(--n, 0) * 90ms + var(--d, 0ms)); }
.lines.in > span > span { transform: none; }

/* Page enter / leave */
main { opacity: 1; transform: none; transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease); }
body.is-leaving main { opacity: 0; transform: translate3d(0, -8px, 0); }
body.is-entering main { opacity: 0; transform: translate3d(0, 10px, 0); }

/* ---------- Intro (short, skippable, never blocks content) ---------- */
.intro { position: fixed; inset: 0; z-index: 1500; display: grid; place-items: center; background: var(--bg); transition: opacity 0.45s var(--ease), visibility 0s linear 0.45s; }
.intro.done { opacity: 0; visibility: hidden; pointer-events: none; }
.intro-mark { position: relative; width: min(46vw, 260px); }
.intro-mark img { width: 100%; opacity: 0; animation: intro-in 0.7s var(--ease-out) 0.1s forwards; }
.intro-mark::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, transparent 20%, rgba(var(--cyan-rgb), 0.9) 45%, rgba(var(--magenta-rgb), 0.9) 55%, transparent 80%); background-size: 60% 100%; background-repeat: no-repeat; background-position: -80% 0; -webkit-mask: url("../img/etc-logo-mask.svg") center / contain no-repeat; mask: url("../img/etc-logo-mask.svg") center / contain no-repeat; animation: intro-sweep 0.9s var(--ease-in-out) 0.25s forwards; }
.intro-line { margin-top: 22px; height: 2px; width: min(46vw, 260px); background: var(--line); overflow: hidden; border-radius: 2px; }
.intro-line i { display: block; height: 100%; width: 100%; background: var(--g-energy); transform: scaleX(0); transform-origin: left; animation: intro-line 0.9s var(--ease-out) 0.2s forwards; }
.intro-tag { margin-top: 14px; text-align: center; font-family: var(--font-mono); font-size: var(--fs-xs); letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); opacity: 0; animation: intro-in 0.6s var(--ease-out) 0.5s forwards; }
.intro-skip { position: absolute; bottom: 28px; font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--muted); }
@keyframes intro-in { from { opacity: 0; transform: translateY(8px) scale(0.98); } to { opacity: 1; transform: none; } }
@keyframes intro-sweep { to { background-position: 180% 0; } }
@keyframes intro-line { to { transform: scaleX(1); } }
body.intro-active main, body.intro-active .nav { opacity: 0; }
body:not(.intro-active) main, body:not(.intro-active) .nav { transition: opacity 0.5s var(--ease); }

/* Scroll progress */
.progress-bar { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 1300; background: var(--g-energy); transform: scaleX(var(--p, 0)); transform-origin: left; pointer-events: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  [data-reveal], .lines > span > span { opacity: 1; transform: none; }
  .intro { display: none; }
  body.intro-active main, body.intro-active .nav { opacity: 1; }
}