/* ============================================================
   RESEARCH ONLY — Brand System
   Pure. Precise. Provable.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Archivo:wght@400;500;600;700&family=Archivo+Narrow:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  /* --- Tweakable tokens --- */
  --accent-h: 150;            /* green hue */
  --accent-c: 0.155;          /* chroma */
  --radius: 14px;
  --density: 1;               /* spacing multiplier */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Archivo', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* --- Derived greens --- */
  --green:        oklch(0.80 var(--accent-c) var(--accent-h));
  --green-bright: oklch(0.89 calc(var(--accent-c) * 0.85) var(--accent-h));
  --green-deep:   oklch(0.55 calc(var(--accent-c) * 0.95) var(--accent-h));
  --green-ink:    oklch(0.40 calc(var(--accent-c) * 0.6) var(--accent-h));

  /* --- Neutrals (cool-green tinted) --- */
  --ink:        oklch(0.20 0.012 var(--accent-h));   /* near-black text */
  --teal-deep:  oklch(0.255 0.028 var(--accent-h));  /* dark brand panel */
  --teal-deeper:oklch(0.205 0.026 var(--accent-h));
  --black:      oklch(0.13 0.008 var(--accent-h));
  --paper:      oklch(0.985 0.004 var(--accent-h));  /* off-white */
  --paper-2:    oklch(0.955 0.006 var(--accent-h));  /* card grey */
  --paper-3:    oklch(0.92 0.008 var(--accent-h));
  --line:       oklch(0.88 0.008 var(--accent-h));
  --line-soft:  oklch(0.93 0.006 var(--accent-h));
  --muted:      oklch(0.52 0.012 var(--accent-h));
  --muted-2:    oklch(0.62 0.01 var(--accent-h));

  /* dark-surface text */
  --on-dark:      oklch(0.96 0.006 var(--accent-h));
  --on-dark-mut:  oklch(0.74 0.012 var(--accent-h));
  --on-dark-line: oklch(0.40 0.02 var(--accent-h));

  --maxw: 1320px;
  --gutter: clamp(20px, 5vw, 64px);
  --header-h: 72px;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 var(--accent-h) / 0.05), 0 2px 8px oklch(0.2 0.02 var(--accent-h) / 0.04);
  --shadow-md: 0 4px 14px oklch(0.2 0.02 var(--accent-h) / 0.08), 0 12px 40px oklch(0.2 0.02 var(--accent-h) / 0.06);
  --shadow-lg: 0 18px 60px oklch(0.2 0.02 var(--accent-h) / 0.14);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
ul, ol { list-style: none; }
::selection { background: var(--green); color: var(--ink); }

/* ============================================================
   Type
   ============================================================ */
h1, h2, h3, h4, h5 { font-family: var(--font-display); font-weight: 500; line-height: 1.05; letter-spacing: -0.02em; color: var(--ink); }
.display {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.6rem, 7vw, 6.2rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
}
.h1 { font-size: clamp(2.2rem, 5vw, 4rem); letter-spacing: -0.03em; }
.h2 { font-size: clamp(1.8rem, 3.6vw, 3rem); letter-spacing: -0.025em; }
.h3 { font-size: clamp(1.3rem, 2.2vw, 1.9rem); letter-spacing: -0.02em; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.35rem); color: var(--muted); line-height: 1.5; max-width: 40ch; }
.mono { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--green-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--green-deep); display: inline-block; }
.text-balance { text-wrap: balance; }
.text-pretty { text-wrap: pretty; }

/* ============================================================
   Layout helpers
   ============================================================ */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: calc(110px * var(--density)); }
.section-sm { padding-block: calc(64px * var(--density)); }
.dark { background: var(--teal-deep); color: var(--on-dark); }
.dark h1, .dark h2, .dark h3, .dark h4 { color: var(--on-dark); }
.dark .lede { color: var(--on-dark-mut); }
.black { background: var(--black); color: var(--on-dark); }
.stack { display: flex; flex-direction: column; }
.grid { display: grid; }
.flex { display: flex; }
.between { display: flex; align-items: center; justify-content: space-between; }
.center { display: flex; align-items: center; justify-content: center; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  --bg: var(--ink); --fg: var(--paper);
  display: inline-flex; align-items: center; gap: 0.7em;
  background: var(--bg); color: var(--fg);
  padding: 0.92em 1.5em;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 500; font-size: 0.92rem;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  transition: transform .4s var(--ease), background .3s, color .3s, box-shadow .3s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn .ic { width: 1.15em; height: 1.15em; }
.btn--green { --bg: var(--green); --fg: var(--ink); }
.btn--green:hover { box-shadow: 0 8px 28px oklch(0.8 var(--accent-c) var(--accent-h) / 0.4); }
.btn--ghost { --bg: transparent; --fg: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); }
.dark .btn--ghost, .black .btn--ghost { --fg: var(--on-dark); border-color: var(--on-dark-line); }
.dark .btn--ghost:hover { border-color: var(--on-dark); }
.btn--light { --bg: var(--paper); --fg: var(--ink); }
.btn--block { display: flex; width: 100%; justify-content: center; }
.btn--lg { padding: 1.1em 1.9em; font-size: 1rem; }
.btn--sm { padding: 0.6em 1.1em; font-size: 0.82rem; }

/* arrow chip button (ASLAB style: label + circular arrow) */
.chip-btn {
  display: inline-flex; align-items: center; gap: 0.9em;
  padding: 0.55em 0.6em 0.55em 1.2em;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  font-family: var(--font-display); font-weight: 500; font-size: 0.92rem;
  transition: border-color .3s, transform .4s var(--ease);
}
.chip-btn .arrow {
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--line);
  display: grid; place-items: center;
  transition: background .3s, transform .4s var(--ease), border-color .3s;
}
.chip-btn:hover { border-color: var(--ink); transform: translateY(-2px); }
.chip-btn:hover .arrow { background: var(--green); border-color: var(--green); transform: rotate(0deg) translateX(2px); }
.chip-btn .arrow svg { width: 14px; height: 14px; }
.dark .chip-btn, .black .chip-btn, .cta-band .chip-btn { background: transparent; color: var(--on-dark); border-color: var(--on-dark-line); }
.dark .chip-btn .arrow, .cta-band .chip-btn .arrow { border-color: var(--on-dark-line); }

/* ============================================================
   Tags / badges
   ============================================================ */
.tag {
  display: inline-flex; align-items: center; gap: 0.4em;
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.4em 0.7em; border-radius: 6px;
  background: var(--paper-2); color: var(--muted);
  border: 1px solid var(--line-soft);
}
.tag--green { background: oklch(0.89 calc(var(--accent-c)*0.85) var(--accent-h) / 0.5); color: var(--green-ink); border-color: transparent; }
.ruo-flag {
  font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--green-deep);
  display: inline-flex; align-items: center; gap: 0.5em;
}
.ruo-flag::before { content:""; width:6px; height:6px; border-radius:50%; background: var(--green); }

/* ============================================================
   Logo
   ============================================================ */
.logo { display: inline-flex; align-items: center; gap: 0.62em; color: inherit; }
.logo svg.mark { width: 38px; height: 32px; flex: none; }
.logo .word {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.04rem; letter-spacing: 0.34em; text-transform: uppercase;
  padding-left: 0.1em;
}
.logo .word b { font-weight: 600; }

/* ============================================================
   Forms
   ============================================================ */
.field { display: flex; flex-direction: column; gap: 0.5em; }
.field label { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.input, .select, .textarea {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85em 1em;
  font-size: 0.98rem;
  transition: border-color .2s, box-shadow .2s;
}
.input:focus, .select:focus, .textarea:focus {
  outline: none; border-color: var(--green-deep);
  box-shadow: 0 0 0 3px oklch(0.8 var(--accent-c) var(--accent-h) / 0.25);
}
.textarea { resize: vertical; min-height: 120px; }
.dark .input, .dark .select, .dark .textarea { background: oklch(0.30 0.03 var(--accent-h)); border-color: var(--on-dark-line); color: var(--on-dark); }

/* ============================================================
   Cards
   ============================================================ */
.card { background: var(--paper); border: 1px solid var(--line-soft); border-radius: var(--radius); }

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: oklch(0.985 0.004 var(--accent-h) / 0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line-soft);
  transition: background .3s, border-color .3s, color .3s;
}
.site-header.on-dark {
  background: oklch(0.255 0.028 var(--accent-h) / 0.6);
  border-bottom-color: var(--on-dark-line);
  color: var(--on-dark);
}
.nav { height: var(--header-h); display: flex; align-items: center; gap: 1.5rem; }
.nav__menu { display: flex; align-items: center; gap: 0.3rem; margin-left: 1.5rem; }
.nav__link {
  font-family: var(--font-display); font-weight: 500; font-size: 0.9rem;
  padding: 0.55em 0.85em; border-radius: 8px;
  color: inherit; opacity: 0.82;
  display: inline-flex; align-items: center; gap: 0.4em;
  transition: opacity .2s, background .2s;
}
.nav__link:hover, .nav__link[aria-current="page"] { opacity: 1; background: oklch(0.5 0.02 var(--accent-h) / 0.08); }
.on-dark .nav__link:hover { background: oklch(0.9 0.02 var(--accent-h) / 0.1); }
.nav__spacer { flex: 1; }
.nav__actions { display: flex; align-items: center; gap: 0.35rem; }
.icon-btn {
  width: 42px; height: 42px; border-radius: 10px;
  display: grid; place-items: center; position: relative;
  color: inherit; opacity: 0.85;
  transition: background .2s, opacity .2s;
}
.icon-btn:hover { opacity: 1; background: oklch(0.5 0.02 var(--accent-h) / 0.08); }
.on-dark .icon-btn:hover { background: oklch(0.9 0.02 var(--accent-h) / 0.1); }
.icon-btn svg { width: 20px; height: 20px; }
.cart-count {
  position: absolute; top: 4px; right: 4px;
  min-width: 17px; height: 17px; padding: 0 4px;
  background: var(--green); color: var(--ink);
  border-radius: 999px; font-family: var(--font-mono); font-size: 0.6rem; font-weight: 600;
  display: grid; place-items: center; line-height: 1;
  transform: scale(0); transition: transform .3s var(--ease);
}
.cart-count.show { transform: scale(1); }

/* products dropdown */
.has-dropdown { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(8px);
  width: min(680px, 88vw);
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 18px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s;
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 18px;
}
.has-dropdown:hover .dropdown, .dropdown:hover, .has-dropdown:focus-within .dropdown {
  opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0);
}
.dropdown__col h4 { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.dropdown__list { display: flex; flex-direction: column; gap: 2px; }
.dropdown__item { padding: 0.55em 0.7em; border-radius: 9px; display: flex; align-items: center; justify-content: space-between; gap: 10px; transition: background .15s; }
.dropdown__item:hover { background: var(--paper-2); }
.dropdown__item .nm { font-weight: 500; font-size: 0.92rem; }
.dropdown__item .ct { font-family: var(--font-mono); font-size: 0.62rem; color: var(--muted); }
.dropdown__feature { background: var(--teal-deep); border-radius: 12px; padding: 16px; color: var(--on-dark); display: flex; flex-direction: column; justify-content: space-between; min-height: 180px; position: relative; overflow: hidden; }
.dropdown__feature .fimg { position: absolute; inset: 0; opacity: 0.5; }

/* mobile nav */
.burger { display: none; }
.mobile-nav {
  position: fixed; inset: 0; z-index: 200;
  background: var(--teal-deep); color: var(--on-dark);
  padding: calc(var(--header-h) + 20px) var(--gutter) 40px;
  transform: translateY(-100%); transition: transform .5s var(--ease);
  overflow-y: auto;
}
.mobile-nav.open { transform: translateY(0); }
.mobile-nav a { display: block; font-family: var(--font-display); font-size: 1.8rem; padding: 0.45em 0; border-bottom: 1px solid var(--on-dark-line); }
.mobile-nav .sub { font-size: 1.05rem; opacity: 0.7; padding-left: 1em; border: none; }
.mobile-nav__close { position: fixed; top: 16px; right: var(--gutter); }

/* ============================================================
   Cart drawer
   ============================================================ */
.scrim { position: fixed; inset: 0; background: oklch(0.13 0.01 var(--accent-h) / 0.45); z-index: 300; opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s; backdrop-filter: blur(2px); }
.scrim.show { opacity: 1; visibility: visible; }
.cart-drawer {
  position: fixed; top: 0; right: 0; z-index: 301;
  width: min(440px, 92vw); height: 100dvh;
  background: var(--paper); color: var(--ink);
  display: flex; flex-direction: column;
  transform: translateX(105%); transition: transform .45s var(--ease);
  box-shadow: var(--shadow-lg);
}
.cart-drawer.open { transform: translateX(0); }
.cart-drawer__head { padding: 22px var(--gutter); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line-soft); }
.cart-drawer__body { flex: 1; overflow-y: auto; padding: 12px 24px; }
.cart-drawer__foot { padding: 20px 24px; border-top: 1px solid var(--line-soft); }
.cart-line { display: grid; grid-template-columns: 60px 1fr auto; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line-soft); align-items: center; }
.cart-line__img { width: 60px; height: 70px; border-radius: 9px; overflow: hidden; background: var(--teal-deep); position: relative; }
.cart-line__nm { font-weight: 600; font-size: 0.95rem; }
.cart-line__meta { font-family: var(--font-mono); font-size: 0.66rem; color: var(--muted); margin-top: 2px; }
.qty { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.qty button { width: 28px; height: 28px; display: grid; place-items: center; font-size: 1rem; color: var(--muted); }
.qty button:hover { background: var(--paper-2); color: var(--ink); }
.qty span { min-width: 26px; text-align: center; font-family: var(--font-mono); font-size: 0.8rem; }
.cart-empty { text-align: center; padding: 60px 20px; color: var(--muted); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { background: var(--black); color: var(--on-dark); padding-block: 70px 36px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer-col h5 { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--green); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--on-dark-mut); padding: 5px 0; font-size: 0.92rem; transition: color .2s; }
.footer-col a:hover { color: var(--on-dark); }
.footer-bottom { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--on-dark-line); display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.footer-bottom .mono { color: var(--on-dark-mut); }
.ruo-banner {
  background: var(--teal-deeper); color: var(--on-dark-mut);
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em;
  text-align: center; padding: 10px var(--gutter); line-height: 1.5;
  border-bottom: 1px solid var(--on-dark-line);
}
.ruo-banner b { color: var(--green); }

/* ============================================================
   Scroll reveal
   ============================================================ */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal][data-reveal="fade"] { transform: none; }
[data-reveal-delay="1"] { transition-delay: .08s; }
[data-reveal-delay="2"] { transition-delay: .16s; }
[data-reveal-delay="3"] { transition-delay: .24s; }
[data-reveal-delay="4"] { transition-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  * { scroll-behavior: auto; }
}

/* ============================================================
   Brand imagery surfaces
   ============================================================ */
.brand-img { position: relative; overflow: hidden; background: var(--teal-deep); }
.brand-img canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.scanlines { position: relative; overflow: hidden; }

/* utility */
.muted { color: var(--muted); }
.green-txt { color: var(--green-deep); }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--line-soft); border: 0; }
.dark .divider, .black .divider { background: var(--on-dark-line); }
.price { font-family: var(--font-display); font-weight: 600; }
.strike { text-decoration: line-through; color: var(--muted); font-weight: 400; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .nav__menu { display: none; }
  .burger { display: grid; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  :root { --header-h: 62px; }
  .footer-grid { grid-template-columns: 1fr; }
  .logo .word { letter-spacing: 0.26em; font-size: 0.95rem; }
  .section { padding-block: calc(72px * var(--density)); }
}