:root {
  --bg: #050b1a;
  --bg-2: #0a1630;
  --panel: rgba(15, 23, 42, 0.58);
  --panel-strong: rgba(15, 23, 42, 0.86);
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(148, 163, 184, 0.28);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --cyan: #06b6d4;
  --sky: #0ea5e9;
  --sky-soft: #38bdf8;
  --indigo: #6366f1;
  --grad: linear-gradient(135deg, var(--cyan) 0%, var(--sky) 45%, var(--indigo) 100%);
  --radius: 18px;
  --width: 1200px;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  /* the floating names and glow may reach past a narrow screen's edge; clip keeps the header sticky */
  overflow-x: clip;
}
body.lb-open { overflow: hidden; }

/* One language at a time: <html lang> picks it, English when nothing is chosen. */
html:not([lang="ko"]) body [lang="ko"],
html[lang="ko"] body [lang="en"] { display: none; }
html[lang="ko"] body { word-break: keep-all; overflow-wrap: break-word; }
/* How to watch the clips, for a mouse or for a touch screen. */
@media (hover: hover) { .for-touch { display: none; } }
@media (hover: none) { .for-pointer { display: none; } }

/* The sign-in page's night: deep navy with soft sky and indigo light. */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 600px at 78% 12%, rgba(14, 165, 233, 0.16), transparent 60%),
    radial-gradient(800px 600px at 10% 40%, rgba(99, 102, 241, 0.12), transparent 60%),
    radial-gradient(700px 500px at 60% 95%, rgba(6, 182, 212, 0.08), transparent 60%),
    linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 55%);
}

a { color: var(--sky-soft); text-decoration: none; }
a:hover { color: #7dd3fc; }
code, pre { font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace; }

/* Header: clear over the first screen, glass once the page moves. */
.top {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px max(20px, calc((100% - var(--width)) / 2));
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
}
.top.scrolled {
  background: rgba(5, 11, 26, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; font-size: 1.2rem; letter-spacing: -0.01em; }
.brand:hover { color: #fff; }
.top nav { display: flex; align-items: center; gap: 22px; font-size: 0.95rem; }
.top nav > a:not(.btn) { color: var(--text-dim); transition: color .2s; }
.top nav > a:not(.btn):hover { color: var(--text); }

.pill {
  font: inherit;
  font-size: 0.85rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.pill:hover { border-color: var(--sky); background: rgba(14, 165, 233, 0.1); }

/* Buttons: the gradient of the particle logo for the main action, glass for the rest. */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 12px;
  font: inherit;
  font-weight: 650;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .2s, background .2s, color .2s;
}
.btn-sm { padding: 7px 14px; font-size: 0.88rem; border-radius: 10px; }
.btn-primary {
  color: #fff;
  background: var(--grad);
  box-shadow: 0 10px 30px -10px rgba(14, 165, 233, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.28);
}
.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform .7s var(--ease);
}
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 40px -12px rgba(56, 189, 248, 0.85), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
.btn-primary:hover::after { transform: translateX(120%); }
.btn-primary svg { transition: transform .25s var(--ease); }
.btn-primary:hover svg { transform: translateX(3px); }
.btn-ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-strong);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { color: #fff; border-color: rgba(56, 189, 248, 0.7); background: rgba(14, 165, 233, 0.1); transform: translateY(-1px); box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12); }

main > section { padding-left: max(20px, calc((100% - var(--width)) / 2)); padding-right: max(20px, calc((100% - var(--width)) / 2)); }

/* First screen: the words on the left, the particle logo on the right. */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: 24px;
  min-height: calc(100vh - 64px);
  padding-top: 24px;
  padding-bottom: 48px;
  /* the names fly in from past the screen's sides: clipped here, or Chrome on Android widens the page for them
     (and keeps it wide, the large view with it); only sideways, the dots still cover the header */
  overflow-x: clip;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-dim);
  font-size: 0.85rem;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--sky); box-shadow: 0 0 10px var(--sky); }
.hero h1 { font-size: clamp(2.5rem, 5vw, 4.3rem); line-height: 1.05; letter-spacing: -0.035em; font-weight: 800; margin: 0 0 22px; text-wrap: balance; }
html[lang="ko"] .hero h1 { letter-spacing: -0.02em; line-height: 1.18; }
.hero h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead { font-size: 1.15rem; color: var(--text-dim); max-width: 34em; margin: 0 0 32px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.snippet {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 560px;
  padding: 10px 10px 10px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(2, 6, 23, 0.55);
}
.snippet code { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 0.82rem; color: #bae6fd; }
.copy {
  font: inherit;
  font-size: 0.8rem;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 10px;
  cursor: pointer;
  transition: color .2s, border-color .2s;
}
.copy:hover { color: var(--text); border-color: var(--sky); }
.copy.copied { color: #4ade80; border-color: #4ade80; }

.hero-text { position: relative; z-index: 1; }
.hero-art { position: relative; height: clamp(420px, 66vh, 660px); }
.particles-canvas { position: absolute; pointer-events: none; }
.particles-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at 50% 50%, rgba(14, 165, 233, 0.24), rgba(99, 102, 241, 0.1) 32%, transparent 62%);
}
.particles-words { position: absolute; inset: 0; }
.word {
  position: absolute;
  white-space: nowrap;
  line-height: 1.3;
  cursor: default;
  user-select: none;
  will-change: transform;
  opacity: var(--o);
  transition: opacity .5s, color .5s, text-shadow .5s, filter .5s;
}
.word.near { color: #f1f5f9; font-weight: 550; }
.word.near:hover { opacity: 1; color: #fff; text-shadow: 0 0 14px rgba(56, 189, 248, 0.8); }
.word.far { color: #e0f2fe; filter: blur(var(--blur)); }
.word.far:hover { opacity: 0.85; filter: blur(0); }

/* Sections */
.section-head { text-align: center; margin: 0 auto 40px; max-width: 720px; }
.kicker {
  display: inline-block;
  margin: 0 0 10px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
h2 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); letter-spacing: -0.025em; line-height: 1.15; margin: 0 0 12px; }
.sub { color: var(--text-dim); margin: 0; }
.features, .more, .install, .faq { padding-top: 96px; }

/* Clip cards: lift and play on hover, open large on click. */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: transform .45s var(--ease), box-shadow .45s var(--ease), border-color .3s;
  outline: none;
}
.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .35s;
  pointer-events: none;
}
.card:hover, .card:focus-visible {
  transform: translateY(-6px) scale(1.035);
  z-index: 2;
  box-shadow: 0 30px 60px -24px rgba(2, 6, 23, 0.9), 0 0 0 1px rgba(56, 189, 248, 0.15), 0 0 40px -10px rgba(14, 165, 233, 0.45);
}
.card:hover::before, .card:focus-visible::before { opacity: 1; }
.thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  margin: 10px 10px 0;
  border-radius: 12px;
  overflow: hidden;
  background: #0b1222;
  border: 1px solid var(--line);
}
.thumb video { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.card:hover .thumb video { transform: scale(1.02); }
.play {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 54px;
  height: 54px;
  margin: -27px 0 0 -27px;
  border-radius: 50%;
  background: rgba(2, 6, 23, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(6px);
  transition: opacity .3s, transform .3s var(--ease);
}
.play::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 16px;
  border-left: 16px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
}
.card.playing .play { opacity: 0; transform: scale(0.8); }
.card-body { padding: 16px 18px 18px; }
.card h3 { font-size: 1.12rem; letter-spacing: -0.01em; margin: 0 0 6px; }
.card-body > p { margin: 0 0 12px; font-size: 0.92rem; color: var(--text-dim); }

/* Steps: numbered; the one the clip is at lights up. */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 6px; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 4px 0 4px 32px;
  font-size: 0.86rem;
  color: var(--text-faint);
  transition: color .3s;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  transition: background .3s, color .3s, border-color .3s, box-shadow .3s;
}
.card:not(.playing) .steps li { color: var(--text-dim); }
.steps li.done { color: var(--text-dim); }
.steps li.done::before { border-color: rgba(56, 189, 248, 0.5); color: var(--sky-soft); }
.steps li.now { color: #fff; }
.steps li.now::before { background: var(--grad); border-color: transparent; color: #fff; box-shadow: 0 0 14px rgba(14, 165, 233, 0.7); }

/* Large view */
.lightbox { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 24px; overflow-y: auto; overscroll-behavior: contain; }
.lightbox[hidden] { display: none; }
.lb-backdrop { position: fixed; inset: 0; background: rgba(2, 6, 23, 0.8); backdrop-filter: blur(10px); }
.lb-frame {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: center;
  width: min(1480px, 100%);
  /* centred while it fits, from the top (scrolling) when it is taller than a small or turned phone */
  margin-block: auto;
}
.lb-video {
  position: relative;
  aspect-ratio: 16 / 10;
  max-height: calc(100vh - 48px);
  border-radius: 16px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 120px -30px rgba(0, 0, 0, 0.9), 0 0 60px -20px rgba(14, 165, 233, 0.5);
  transform-origin: top left;
}
.lb-video video { display: block; width: 100%; height: 100%; object-fit: contain; background: #000; }
.lb-caption {
  position: absolute;
  left: 16px;
  bottom: 52px;
  max-width: calc(100% - 32px);
  padding: 8px 14px;
  border-radius: 10px;
  background: rgba(2, 6, 23, 0.78);
  border: 1px solid rgba(56, 189, 248, 0.35);
  backdrop-filter: blur(8px);
  font-weight: 600;
  font-size: 0.95rem;
  pointer-events: none;
}
.lb-caption:empty { display: none; }
.lb-side { color: var(--text); }
.lb-side h3 { font-size: 1.4rem; letter-spacing: -0.015em; margin: 0 0 8px; }
.lb-text p { color: var(--text-dim); margin: 0 0 16px; font-size: 0.95rem; }
.lb-steps li { font-size: 0.95rem; }
.lb-nav { display: flex; gap: 8px; margin-top: 20px; }
.lb-close {
  position: absolute;
  top: -14px;
  right: -14px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--line-strong);
  cursor: pointer;
  transition: border-color .2s, transform .2s var(--ease);
}
.lb-close:hover { border-color: var(--sky); transform: rotate(90deg); }

/* Also in the box */
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.tile {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text-dim);
  font-size: 0.9rem;
  transition: border-color .3s, transform .3s var(--ease), background .3s;
}
.tile b { display: block; color: var(--text); font-size: 1rem; margin-bottom: 6px; }
.tile:hover { border-color: rgba(56, 189, 248, 0.45); transform: translateY(-3px); background: rgba(14, 165, 233, 0.06); }

/* Install: a terminal with tabs */
.terminal {
  max-width: 900px;
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: rgba(2, 6, 23, 0.82);
  overflow: hidden;
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.8), 0 0 50px -25px rgba(14, 165, 233, 0.5);
}
.term-bar { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: rgba(15, 23, 42, 0.7); }
.lights { display: flex; gap: 6px; }
.lights i { width: 11px; height: 11px; border-radius: 50%; background: #ef4444; opacity: .8; }
.lights i:nth-child(2) { background: #eab308; }
.lights i:nth-child(3) { background: #22c55e; }
.tabs { display: flex; gap: 4px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.term-bar .copy { flex-shrink: 0; }
.tab {
  font: inherit;
  font-size: 0.85rem;
  color: var(--text-dim);
  background: none;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 4px 12px;
  white-space: nowrap;
  cursor: pointer;
}
.tab.active { color: var(--text); background: rgba(255, 255, 255, 0.06); border-color: var(--line); }
.tab-panel { display: none; margin: 0; padding: 22px 24px; overflow-x: auto; font-size: 0.9rem; line-height: 1.7; color: #e0f2fe; }
.tab-panel.active { display: block; }
.prompt { color: var(--sky-soft); user-select: none; }
.comment { color: var(--text-faint); }
.install-note { text-align: center; color: var(--text-dim); margin: 20px 0 0; }

/* FAQ */
/* A narrower column through the sections' own side padding (a max-width here would subtract that padding twice). */
.faq { --width: 860px; padding-bottom: 96px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  margin-bottom: 10px;
  transition: border-color .3s, background .3s;
}
.faq details[open]:not(.closing) { border-color: rgba(56, 189, 248, 0.4); background: rgba(14, 165, 233, 0.05); }
.faq summary { list-style: none; cursor: pointer; padding: 18px 54px 18px 20px; font-weight: 650; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--sky-soft);
  transition: transform .3s var(--ease);
}
.faq details[open]:not(.closing) summary::after { transform: translateY(-50%) rotate(45deg); }
.answer { padding: 0 20px 18px; color: var(--text-dim); overflow: hidden; }
.answer p { margin: 0; }
.answer code { font-size: 0.88em; background: rgba(255, 255, 255, 0.06); padding: 1px 6px; border-radius: 5px; }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 28px max(20px, calc((100% - var(--width)) / 2));
  border-top: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 0.9rem;
}
.foot-brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); }
footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
footer nav a { color: var(--text-dim); }
footer nav a:hover { color: var(--text); }

@media (max-width: 1080px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lb-frame { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .lb-side { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 16px; align-items: start; }
  .lb-side h3, .lb-text { grid-column: 1; }
  .lb-steps { grid-column: 1; }
  .lb-nav { grid-column: 2; grid-row: 1; margin: 0; }
}
@media (max-width: 760px) {
  .top nav > a:not(.btn) { display: none; }
  .hero { grid-template-columns: minmax(0, 1fr); min-height: auto; padding-top: 8px; }
  .hero-art { order: -1; height: 340px; }
  /* minmax(0, …) as above: WebKit (Safari, iOS browsers) takes a video's own width as the card's minimum */
  .grid, .tiles { grid-template-columns: minmax(0, 1fr); }
  .card:hover { transform: none; }
  .features, .more, .install, .faq { padding-top: 64px; }
  /* nothing over the clip on a phone: the step list under it lights the step, and Close sits above it */
  .lightbox { padding-top: 68px; }
  .lb-close { top: -52px; right: 0; }
  .lb-caption { display: none; }
  /* the text sits over the page here, not beside the clip */
  .lb-backdrop { background: var(--bg); }
  .lights { display: none; }
  .term-bar { gap: 8px; padding: 10px; }
  .tab { padding: 4px 9px; }
}
@media (max-width: 380px) {
  .gh-label { display: none; }
  .top nav .btn-sm { padding: 7px 10px; }
}