/* =========================================================
   MecoToolkit — hardcore biotech theme
   ========================================================= */

:root {
  --bg:        #05080a;
  --bg-2:      #081014;
  --panel:     rgba(11, 20, 24, 0.72);
  --panel-2:   rgba(13, 25, 30, 0.9);
  --line:      rgba(46, 230, 168, 0.14);
  --line-2:    rgba(120, 160, 170, 0.16);
  --accent:    #2ee6a8;   /* phosphor green */
  --accent-2:  #35c8ff;   /* cyan           */
  --accent-3:  #ffb454;   /* amber          */
  --text:      #d8e8e6;
  --text-2:    #a9c1c0;
  --muted:     #6f8b8c;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --radius: 4px;
  --wrap: 1180px;
  --header-h: 66px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; }
button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--accent); color: #04120c; padding: 10px 16px; font-weight: 600;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ------------------- background layers ------------------- */
.bg-grid, .bg-glow, .bg-scan { position: fixed; inset: 0; pointer-events: none; z-index: 0; }

.bg-grid {
  background-image:
    linear-gradient(rgba(46,230,168,0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46,230,168,0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 10%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 10%, transparent 78%);
}

.bg-glow {
  background:
    radial-gradient(720px 420px at 78% 6%, rgba(53,200,255,0.14), transparent 62%),
    radial-gradient(760px 460px at 14% 20%, rgba(46,230,168,0.12), transparent 64%),
    radial-gradient(900px 600px at 50% 110%, rgba(46,230,168,0.07), transparent 60%);
}

.bg-scan {
  background:
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.016) 0 1px, transparent 1px 3px);
  opacity: .5;
}

/* ------------------- header ------------------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(5, 9, 11, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line-2);
}
.site-header.is-scrolled { background: rgba(5, 9, 11, 0.92); border-bottom-color: var(--line); }

.header__inner { display: flex; align-items: center; gap: 22px; }

.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--text); }
.brand:hover { color: var(--text); }
.brand__mark { color: var(--accent); display: inline-flex; filter: drop-shadow(0 0 10px rgba(46,230,168,.35)); }
.brand__text { display: flex; flex-direction: column; line-height: 1.05; }
.brand__text strong { font-size: 16px; letter-spacing: .04em; }
.brand--sm strong { font-size: 15px; }

.nav { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.nav a, .nav__btn {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-2); padding: 6px 0; position: relative;
}
.nav__btn { background: none; border: 0; }
.nav a::after, .nav__btn::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--accent); transition: width .25s ease;
}
.nav a:hover, .nav__btn:hover,
.nav__btn[aria-expanded="true"] { color: var(--accent); }
.nav a:hover::after, .nav__btn:hover::after,
.nav__btn[aria-expanded="true"]::after { width: 100%; }

.header__actions { display: flex; align-items: center; gap: 12px; }

/* ------------------- language selector ------------------- */
.lang { position: relative; }
.lang__btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(46,230,168,0.06);
  border: 1px solid var(--line);
  color: var(--text); border-radius: var(--radius);
  padding: 7px 11px; font-family: var(--mono); font-size: 12.5px; letter-spacing: .04em;
  transition: border-color .2s, background .2s;
}
.lang__btn:hover { border-color: var(--accent); background: rgba(46,230,168,0.11); }
.lang__btn svg { color: var(--accent); }
.lang__caret { color: var(--muted); transition: transform .2s; }
.lang.is-open .lang__caret { transform: rotate(180deg); }

.lang__menu {
  position: absolute; right: 0; top: calc(100% + 9px); min-width: 186px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 22px 50px rgba(0,0,0,.55);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .18s, transform .18s, visibility .18s;
  z-index: 120; max-height: 60vh; overflow: auto;
}
.lang.is-open .lang__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang__menu li { margin: 0; }
.lang__opt {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  width: 100%; text-align: left; background: none; border: 0;
  padding: 8px 11px; border-radius: 3px; font-size: 14px; color: var(--text-2);
}
.lang__opt span { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: .08em; }
.lang__opt:hover { background: rgba(46,230,168,0.1); color: var(--text); }
.lang__opt[aria-selected="true"] { color: var(--accent); background: rgba(46,230,168,0.12); }
.lang__opt[aria-selected="true"]::before { content: "▸ "; color: var(--accent); }

/* ------------------- mobile nav toggle ------------------- */
.navtoggle { display: none; width: 40px; height: 36px; background: none; border: 1px solid var(--line-2); border-radius: var(--radius); padding: 9px 9px; }
.navtoggle span { display: block; height: 2px; background: var(--text-2); border-radius: 2px; transition: transform .2s, opacity .2s; }
.navtoggle span + span { margin-top: 4px; }
.navtoggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.navtoggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.navtoggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ------------------- hero ------------------- */
.hero { position: relative; padding: calc(var(--header-h) + 84px) 0 40px; z-index: 1; }

.hero__grid {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: 48px; align-items: center;
}

.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
}
.eyebrow::before { content: "▚ "; color: var(--accent-2); }

.hero__title {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-family: var(--mono); font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(120deg, #eafff7 0%, var(--accent) 46%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 34px rgba(46,230,168,.22));
}

.hero__lead { margin-top: 20px; font-size: clamp(1.05rem, 2.2vw, 1.3rem); color: var(--text); max-width: 62ch; }
.hero__desc { margin-top: 16px; color: var(--text-2); max-width: 62ch; font-size: 15.5px; }
/* Chinese lead must stay on a single line */
html[lang="zh"] .hero__lead { max-width: none; white-space: nowrap; }

.hero__cta { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 14px; }

.hero__ticks { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px 26px; }
.hero__ticks li { display: inline-flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--muted); text-transform: uppercase; }
.dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
.dot--green { background: var(--accent); box-shadow: 0 0 9px var(--accent); }
.dot--cyan  { background: var(--accent-2); box-shadow: 0 0 9px var(--accent-2); }
.dot--amber { background: var(--accent-3); box-shadow: 0 0 9px var(--accent-3); }

/* microbiome visual — circular phylogenetic tree */
.hero__visual { position: relative; height: 460px; display: flex; justify-content: center; }
.tree { height: 100%; width: 100%; overflow: visible; }
.tree__branch,
.tree__arc { fill: none; stroke: var(--accent); stroke-width: 1.1; stroke-linecap: round; }
.tree__branch { stroke: var(--accent-2); }
.tree__bandseg { fill: none; stroke-width: 7; opacity: .85; }
.tree__core { fill: var(--accent-3); }
.tree__leaf { animation: leafpulse 3.6s ease-in-out infinite; }
@keyframes leafpulse { 0%, 100% { opacity: .4; } 50% { opacity: 1; } }
.tree__ring {
  fill: none; stroke: rgba(53, 200, 255, .3); stroke-width: 1.4; stroke-dasharray: 3 9;
  transform-box: view-box; transform-origin: 50% 50%;
  animation: spin 80s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hud {
  position: absolute; left: 0; bottom: 12px;
  display: flex; flex-direction: column; gap: 5px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em; color: var(--muted);
  border-left: 2px solid var(--line); padding-left: 10px;
}
.hud__row b { color: var(--accent-2); font-weight: 600; margin-right: 6px; }

/* ------------------- ticker ------------------- */
.ticker {
  margin: 46px 0 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: rgba(46,230,168,0.03); overflow: hidden; position: relative; z-index: 1;
}
.ticker__track {
  display: flex; white-space: nowrap; will-change: transform;
  animation: ticker 42s linear infinite;
  font-family: var(--mono); font-size: 12px; letter-spacing: .16em; color: rgba(46,230,168,.5);
  padding: 11px 0;
}
.ticker__track span { padding-right: 26px; }
@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ------------------- sections ------------------- */
.section { position: relative; padding: 96px 0; z-index: 1; }
.section--download { padding-bottom: 108px; }

.section__head { max-width: 760px; margin-bottom: 44px; }
.section__title { font-size: clamp(1.7rem, 4vw, 2.5rem); }
.section__sub { margin-top: 14px; color: var(--text-2); }

.prose { max-width: 78ch; display: grid; gap: 16px; color: var(--text-2); font-size: 16px; }
.prose p:first-child { color: var(--text); }

/* ------------------- feature cards ------------------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.card {
  position: relative; padding: 26px 24px 28px;
  background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--radius);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
  overflow: hidden;
}
.card::before, .card::after {
  content: ""; position: absolute; width: 15px; height: 15px; opacity: 0; transition: opacity .25s;
  border-color: var(--accent);
}
.card::before { top: -1px; left: -1px; border-top: 2px solid; border-left: 2px solid; }
.card::after { bottom: -1px; right: -1px; border-bottom: 2px solid; border-right: 2px solid; }
.card:hover { transform: translateY(-4px); border-color: var(--line); background: var(--panel-2); }
.card:hover::before, .card:hover::after { opacity: 1; }

.card__idx { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; color: var(--accent-2); }
.card h3 { margin-top: 14px; font-size: 1.1rem; }
.card p { margin-top: 10px; color: var(--text-2); font-size: 14.5px; }

/* ------------------- download ------------------- */
.dl { display: grid; grid-template-columns: 1fr; max-width: 760px; margin: 0 auto; }

.dl-card {
  display: flex; flex-direction: column;
  padding: 28px; border: 1px solid var(--line-2); border-radius: var(--radius);
  background: var(--panel);
}
.dl-card--primary {
  border-color: rgba(46,230,168,0.4);
  background: linear-gradient(180deg, rgba(46,230,168,0.09), rgba(8,16,20,.35));
  box-shadow: 0 0 0 1px rgba(46,230,168,.06), 0 24px 60px -30px rgba(46,230,168,.5);
}
/* OS label + download button sit side by side on one row */
.dl-card__row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 26px; }
.dl-card__os { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--text); }
.dl-card__btn { padding: 10px 18px; margin-top: 0; white-space: nowrap; }
.dl-card h3 { margin-top: 0; font-size: 1.25rem; }
.dl-card__desc { margin-top: 10px; color: var(--text-2); font-size: 14.5px; }

.tag {
  display: inline-block; font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em;
  padding: 4px 9px; border-radius: 3px; border: 1px solid currentColor;
}
.tag--green { color: var(--accent); background: rgba(46,230,168,.1); }
.tag--cyan  { color: var(--accent-2); background: rgba(53,200,255,.1); }
.tag--amber { color: var(--accent-3); background: rgba(255,180,84,.1); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 20px; border-radius: var(--radius);
  font-family: var(--mono); font-size: 13px; letter-spacing: .06em; text-transform: uppercase;
  border: 1px solid transparent; transition: transform .18s, background .2s, border-color .2s, box-shadow .2s;
}
.btn svg { flex: none; }
.btn--block { width: 100%; margin-top: 22px; }
.btn--primary {
  background: linear-gradient(180deg, var(--accent), #17c98d); color: #03140d; font-weight: 700;
  box-shadow: 0 10px 30px -10px rgba(46,230,168,.7);
}
.btn--primary:hover { color: #03140d; transform: translateY(-2px); box-shadow: 0 16px 36px -12px rgba(46,230,168,.85); }
.btn--ghost { background: rgba(53,200,255,0.05); border-color: var(--line-2); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent-2); color: var(--accent-2); transform: translateY(-2px); }
.btn--amber { background: rgba(255,180,84,.08); border-color: var(--accent-3); color: var(--accent-3); margin-top: 22px; text-transform: none; letter-spacing: .02em; }
.btn--amber:hover { background: var(--accent-3); color: #1a1004; transform: translateY(-2px); }

/* ------------------- license ------------------- */
.license {
  display: flex; gap: 20px; margin: 26px auto 0; max-width: 760px;
  padding: 28px; border-radius: var(--radius);
  border: 1px solid rgba(255,180,84,.32);
  background: linear-gradient(120deg, rgba(255,180,84,.07), rgba(8,16,20,.35));
}
.license__mark { color: var(--accent-3); flex: none; }
.license__body { max-width: 80ch; }
.license p { margin-top: 12px; color: var(--text-2); font-size: 14.5px; }
.license__list { display: flex; flex-wrap: wrap; gap: 12px 34px; margin-top: 18px; }
.license__list li { display: flex; flex-direction: column; gap: 3px; padding-left: 16px; position: relative; }
.license__list li::before { content: "▪"; position: absolute; left: 0; color: var(--accent-3); }
.license__list b { font-size: 14px; }
.license__list span { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--muted); }

/* ------------------- partnership modal ------------------- */
body.is-modal { overflow: hidden; }

.modal {
  position: fixed; inset: 0; z-index: 160;
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.modal[hidden] { display: none; }
.modal__backdrop {
  position: absolute; inset: 0; background: rgba(2,5,7,.74);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.modal__card {
  position: relative; width: 100%; max-width: 460px;
  padding: 30px 28px 28px; border-radius: var(--radius);
  border: 1px solid rgba(53,200,255,.34);
  background: var(--panel-2);
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.9);
  animation: modalIn .2s ease;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.modal__close {
  position: absolute; top: 12px; right: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; padding: 0;
  background: none; border: 1px solid var(--line-2); border-radius: var(--radius); color: var(--muted);
  transition: color .2s, border-color .2s;
}
.modal__close:hover { color: var(--accent); border-color: var(--accent); }
.modal h3 { font-size: 1.25rem; padding-right: 34px; }
.modal__desc { margin-top: 10px; color: var(--text-2); font-size: 14.5px; }
.coop__row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.coop__mail {
  font-family: var(--mono); font-size: 15px; letter-spacing: .01em;
  color: var(--text); word-break: break-all;
}
.coop__mail:hover { color: var(--accent); }
.coop__copy { padding: 9px 16px; font-size: 12px; text-transform: none; letter-spacing: .02em; }
.coop__copy.is-done { border-color: var(--accent); color: var(--accent); }

/* ------------------- footer ------------------- */
.site-footer { position: relative; z-index: 1; border-top: 1px solid var(--line); background: rgba(4,8,10,.85); padding-top: 58px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 34px; padding-bottom: 44px; }
.footer__mail { display: inline-block; font-family: var(--mono); font-size: 12.5px; }
.footer__col { display: flex; flex-direction: column; gap: 10px; }
.footer__col h4 {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 4px;
}
.footer__col a { color: var(--text-2); font-size: 14px; }
.footer__col a:hover { color: var(--accent); }

.footer__bar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px;
  padding: 20px 24px 30px; border-top: 1px solid var(--line-2);
}
.footer__legal { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer__line { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); }
.footer__line em {
  font-style: normal; font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: rgba(111,139,140,.75);
}
.footer__line a, .footer__line span { color: var(--text-2); font-family: var(--mono); font-size: 12px; }
.footer__copy { font-size: 12.5px; color: var(--muted); }

/* ------------------- reveal animation ------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .ticker__track, .tree__ring, .tree__leaf { animation: none; }
  .modal__card { animation: none; }
  html { scroll-behavior: auto; }
}

/* ------------------- responsive ------------------- */
@media (max-width: 1000px) {
  .hero__grid { grid-template-columns: 1fr; gap: 30px; }
  .hero__visual { height: 320px; order: -1; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .navtoggle { display: block; }
  .nav {
    position: absolute; top: var(--header-h); left: 0; right: 0; margin: 0;
    flex-direction: column; gap: 0;
    background: rgba(6,11,14,.98); border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
    max-height: 0; overflow: hidden; transition: max-height .28s ease;
  }
  .nav.is-open { max-height: 320px; }
  .nav a, .nav__btn { padding: 13px 0; border-bottom: 1px solid var(--line-2); text-align: left; width: 100%; }
  .nav a::after, .nav__btn::after { display: none; }

  /* narrow screens: let the lead wrap instead of overflowing */
  html[lang="zh"] .hero__lead { white-space: normal; }

  .cards, .dl { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .license { flex-direction: column; }
}

@media (max-width: 560px) {
  .footer__grid { grid-template-columns: 1fr; }
}