/* IRONFORGE site v1 - dark-first, single theme (brand is matte black).
   Layout: full-bleed bands, 1120px content column, 16px+ side gutter. */
:root {
  --bg: #0d0d0d;
  --bg-2: #151515;
  --bg-3: #1d1d1d;
  --line: rgba(255, 255, 255, 0.1);
  --fg: #f2f0ec;
  --fg-2: #b9b5ad;
  --fg-3: #7d7a74;
  --orange: #ff6a13;      /* Pantone 1585 C on screen */
  --orange-2: #ff8a3d;
  --display: "Barlow Condensed", "Arial Narrow", Impact, sans-serif;
  --body: "Barlow", "Helvetica Neue", Arial, sans-serif;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  --col: 1120px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--body); font-size: 17px; line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--display); text-transform: uppercase; line-height: 1; margin: 0; text-wrap: balance; letter-spacing: 0.01em; }
h1 { font-size: clamp(56px, 11vw, 132px); font-weight: 700; }
h2 { font-size: clamp(40px, 6.5vw, 72px); font-weight: 700; }
h3 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 600; }
p { margin: 0; }
.wrap { max-width: var(--col); margin-inline: auto; padding-left: var(--gutter-l); padding-right: var(--gutter-r); }
.eyebrow { font-family: var(--display); text-transform: uppercase; letter-spacing: 0.18em; font-size: 14px; font-weight: 600; color: var(--orange); }
.lede { font-size: clamp(18px, 2vw, 22px); color: var(--fg-2); max-width: 60ch; }
.rule { width: 72px; height: 3px; background: var(--orange); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; font-family: var(--display); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; font-size: 18px; padding: 14px 26px; border: 2px solid var(--orange); background: var(--orange); color: #0d0d0d; text-decoration: none; border-radius: 3px; cursor: pointer; transition: transform .15s ease, background .15s ease; }
.btn:hover { background: var(--orange-2); border-color: var(--orange-2); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--fg); border-color: rgba(255,255,255,0.35); }
.btn.ghost:hover { border-color: var(--fg); background: rgba(255,255,255,0.06); }
.btn.soon { background: transparent; color: var(--fg-2); border-color: var(--line); cursor: default; }
.btn.soon:hover { transform: none; background: transparent; border-color: var(--line); }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }

/* header */
.top { position: sticky; top: 0; z-index: 20; background: rgba(13,13,13,0.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; font-size: 22px; letter-spacing: 0.06em; text-decoration: none; text-transform: uppercase; }
.brand svg { width: 30px; height: 30px; }
.nav { display: flex; gap: 26px; font-family: var(--display); text-transform: uppercase; letter-spacing: 0.1em; font-size: 15px; font-weight: 600; }
.nav a { text-decoration: none; color: var(--fg-2); }
.nav a:hover { color: var(--fg); }
.nav a.hot { color: var(--orange); }
@media (max-width: 640px) { .nav { gap: 16px; font-size: 13px; } .nav .hide-sm { display: none; } }

/* hero */
.hero { position: relative; overflow: hidden; min-height: 78vh; display: flex; align-items: flex-end; isolation: isolate; }
.hero img.bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 62% 40%; z-index: -2; animation: slowzoom 18s ease-out both; filter: saturate(0.9); }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(180deg, rgba(13,13,13,0.35) 0%, rgba(13,13,13,0.25) 35%, rgba(13,13,13,0.92) 80%, var(--bg) 100%); }
.hero .wrap { padding-block: 120px 56px; width: 100%; }
.hero h1 { max-width: 14ch; }
.hero h1 span { color: var(--orange); }
.hero .lede { margin-top: 18px; }
.hero .cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero .logo { width: min(300px, 55vw); margin-bottom: 28px; }
@keyframes slowzoom { from { transform: scale(1.08); } to { transform: scale(1); } }

/* reveal */
.rv { opacity: 1; transform: none; }
.js .rv { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.js .rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .rv { opacity: 1; transform: none; transition: none; } .hero img.bg { animation: none; } html { scroll-behavior: auto; } }

/* sections */
.band { padding-block: 88px; }
.band.alt { background: var(--bg-2); }
.band .head { display: grid; gap: 14px; margin-bottom: 44px; }

/* steps strip */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; background: var(--line); border: 1px solid var(--line); }
.steps > div { background: var(--bg); padding: 28px 24px; display: grid; gap: 8px; }
.steps .n { font-family: var(--display); font-size: 56px; font-weight: 700; color: var(--orange); line-height: 1; }
.steps h3 { font-size: 24px; }
.steps p { color: var(--fg-2); font-size: 16px; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }

/* product */
.product { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.product + .product { margin-top: 96px; padding-top: 96px; border-top: 1px solid var(--line); }
.product.flip { grid-template-columns: minmax(0, 1fr) minmax(0, 420px); }
.product.flip .tube { order: 2; }
@media (max-width: 820px) { .product, .product.flip { grid-template-columns: 1fr; } .product.flip .tube { order: 0; } }
.tube { position: relative; display: block; width: 100%; max-width: 420px; margin-inline: auto; aspect-ratio: 3 / 7; border-radius: 22px 22px 34px 34px / 14px 14px 26px 26px; background: radial-gradient(120% 60% at 30% 0%, #2a2a2a, #0a0a0a 60%); box-shadow: 0 30px 60px rgba(0,0,0,0.6), inset 0 0 0 1px rgba(255,255,255,0.06); overflow: hidden; cursor: pointer; border: 0; padding: 0; }
.tube img { position: absolute; inset: 7% 12%; width: 76%; height: 86%; object-fit: contain; transition: opacity .35s ease; }
.tube img.back { opacity: 0; }
.tube.show-back img.front { opacity: 0; }
.tube.show-back img.back { opacity: 1; }
@media (hover: hover) { .tube:hover img.front { opacity: 0; } .tube:hover img.back { opacity: 1; } }
.tube .hint { position: absolute; left: 0; right: 0; bottom: 14px; text-align: center; font-family: var(--display); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--fg-3); }
.info { display: grid; gap: 22px; }
.info .meta { display: flex; flex-wrap: wrap; gap: 10px 22px; font-family: var(--display); text-transform: uppercase; letter-spacing: 0.1em; font-size: 15px; color: var(--fg-2); }
.info .meta b { color: var(--fg); font-weight: 700; }
.info ul { margin: 0; padding-left: 20px; color: var(--fg-2); display: grid; gap: 8px; }
.info ul b { color: var(--fg); }
details { border-top: 1px solid var(--line); padding-top: 14px; }
details summary { cursor: pointer; font-family: var(--display); text-transform: uppercase; letter-spacing: 0.1em; font-weight: 600; font-size: 15px; color: var(--fg); list-style: none; display: flex; justify-content: space-between; }
details summary::after { content: "+"; color: var(--orange); }
details[open] summary::after { content: "–"; }
details p { margin-top: 10px; color: var(--fg-2); font-size: 15px; line-height: 1.55; }
.buy { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.buy .price { font-family: var(--display); font-size: 34px; font-weight: 700; }

/* set */
.set { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
@media (max-width: 820px) { .set { grid-template-columns: 1fr; } }
.set .pair { display: flex; gap: 6%; align-items: flex-end; justify-content: center; }
.set .pair .tube { width: 44%; max-width: 230px; margin: 0; }
.set .pair .tube.sm { width: 36%; max-width: 190px; aspect-ratio: 3 / 6.4; }
.callout { border-left: 3px solid var(--orange); padding: 10px 18px; color: var(--fg-2); background: var(--bg-3); }

/* about strip */
.about { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.about > div { display: grid; gap: 10px; }
.about h3 { font-size: 24px; }
.about p { color: var(--fg-2); font-size: 16px; }
@media (max-width: 760px) { .about { grid-template-columns: 1fr; } }

/* signup */
.signup { background: var(--orange); color: #0d0d0d; }
.signup .wrap { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; align-items: center; padding-block: 64px; }
@media (max-width: 820px) { .signup .wrap { grid-template-columns: 1fr; } }
.signup h2 { color: #0d0d0d; }
.signup p { color: rgba(13,13,13,0.8); }
.signup form { display: grid; gap: 10px; }
.signup .row { display: flex; gap: 8px; }
.signup .row[hidden], .signup [hidden] { display: none; }
.signup input[type=email] { flex: 1; min-width: 0; font: inherit; font-size: 17px; padding: 13px 16px; border: 2px solid #0d0d0d; background: #fff8f2; color: #0d0d0d; border-radius: 3px; }
.signup input::placeholder { color: #7a6a60; }
.signup .btn { background: #0d0d0d; border-color: #0d0d0d; color: #fff; }
.signup .btn:hover { background: #262626; border-color: #262626; }
.signup small { color: rgba(13,13,13,0.7); font-size: 13px; }
.signup .ok { font-family: var(--display); font-size: 22px; text-transform: uppercase; letter-spacing: 0.06em; }
.hp { position: absolute; left: -9999px; }

/* footer */
footer { padding-block: 64px 36px; border-top: 1px solid var(--line); }
footer .big { font-family: var(--display); text-transform: uppercase; font-weight: 700; font-size: clamp(44px, 9vw, 120px); line-height: 0.95; letter-spacing: 0.01em; color: var(--bg-3); -webkit-text-stroke: 1px rgba(255,255,255,0.18); margin-bottom: 36px; }
footer .big span { color: var(--orange); -webkit-text-stroke: 0; }
.fgrid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
@media (max-width: 760px) { .fgrid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 420px) { .fgrid { grid-template-columns: 1fr; } }
.fgrid h4 { font-size: 15px; letter-spacing: 0.14em; color: var(--fg-3); margin-bottom: 12px; }
.fgrid a { display: block; text-decoration: none; color: var(--fg-2); padding: 3px 0; }
.fgrid a:hover { color: var(--fg); }
.fgrid p { color: var(--fg-2); font-size: 15px; }
.legal { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 13px; color: var(--fg-3); }
.legal a { color: var(--fg-3); text-decoration: none; }

/* document pages */
.doc { padding-block: 64px 96px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-size: clamp(40px, 7vw, 72px); margin-bottom: 8px; }
.doc .updated { color: var(--fg-3); font-size: 14px; margin-bottom: 36px; }
.doc h2 { font-size: 26px; margin: 36px 0 10px; }
.doc p, .doc li { color: var(--fg-2); }
.doc ul { padding-left: 20px; display: grid; gap: 6px; }
.doc .box { border: 1px solid var(--line); background: var(--bg-2); padding: 20px 22px; margin-top: 18px; display: grid; gap: 8px; }
.doc .box b { color: var(--fg); }
.copy { display: inline-flex; gap: 8px; align-items: center; font-family: var(--body); font-size: 15px; border: 1px solid var(--line); background: var(--bg-3); color: var(--fg); padding: 6px 12px; border-radius: 3px; cursor: pointer; }