/* a3gent — one ink, one accent, generous whitespace.
   No web fonts: the site's CSP is 'self'-only, and the platform Korean faces
   (Apple SD Gothic Neo / Malgun Gothic / Noto Sans KR) render well enough
   that a font download isn't worth the request. */

:root {
  --ink: #0b1220;
  --ink-2: #1a2438;
  --text: #0f172a;
  --muted: #5b6475;
  --line: #e4e7ec;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --accent: #2f6bff;
  --accent-ink: #1d4fd8;
  --radius: 14px;
  --wrap: 1120px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic",
        "Noto Sans KR", "Segoe UI", system-ui, sans-serif;
  word-break: keep-all;          /* Korean: break between words, not mid-word */
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
h1, h2, h3, h4 { color: var(--ink); letter-spacing: -0.02em; line-height: 1.3; margin: 0; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

/* ── Header ─────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 18, 32, 0.86);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.wordmark {
  font-weight: 800; font-size: 20px; letter-spacing: -0.04em;
  color: #fff; text-decoration: none;
}
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: rgba(255, 255, 255, 0.72); text-decoration: none; font-size: 14px; font-weight: 500; transition: color .15s; }
.nav a:hover { color: #fff; }
.nav .nav-cta {
  color: #fff; background: var(--accent); padding: 8px 16px; border-radius: 999px;
}
.nav .nav-cta:hover { background: var(--accent-ink); }

/* ── Hero ───────────────────────────────────────────── */
.hero {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(47, 107, 255, 0.28), transparent 60%),
    radial-gradient(700px 360px at -10% 110%, rgba(47, 107, 255, 0.12), transparent 60%),
    var(--ink);
  color: #fff;
  padding-block: 112px 88px;
}
.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: #8fb0ff; margin-bottom: 20px;
}
.hero h1 {
  color: #fff;
  font-size: clamp(2.2rem, 5.6vw, 4rem);
  font-weight: 800; letter-spacing: -0.035em; line-height: 1.18;
}
.lede {
  margin-top: 28px; max-width: 680px;
  font-size: clamp(1rem, 1.6vw, 1.15rem); color: rgba(255, 255, 255, 0.72);
}
.lede strong { color: #fff; font-weight: 600; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 50px; padding: 0 24px; border-radius: 999px;
  font-weight: 600; font-size: 15px; text-decoration: none;
  transition: background .15s, border-color .15s, transform .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); }
.btn-ghost { color: #fff; border: 1px solid rgba(255, 255, 255, 0.28); }
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.6); }

/* The 01 → 02 → 03 path under the hero: the order the visitor should read. */
.path {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  margin-top: 72px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius); overflow: hidden;
}
.path a {
  display: flex; flex-direction: column; gap: 4px; height: 100%;
  padding: 22px 24px; background: var(--ink); text-decoration: none;
  transition: background .15s;
}
.path a:hover { background: var(--ink-2); }
.path-no { font-size: 12px; font-weight: 700; color: #8fb0ff; letter-spacing: 0.08em; }
.path-label { font-weight: 700; color: #fff; }
.path-sub { font-size: 13px; color: rgba(255, 255, 255, 0.55); }

/* ── Sections ───────────────────────────────────────── */
.section { padding-block: 104px; }
.section.alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin-bottom: 56px; }
.kicker { font-size: 13px; font-weight: 700; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 14px; }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.35rem); font-weight: 800; }
.section-lede { margin-top: 16px; color: var(--muted); font-size: 1.05rem; }

.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.pillar, .cap {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px;
}
.section.alt .cap { background: var(--bg); }
.pillar-no {
  display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  background: #eef3ff; color: var(--accent); font-weight: 800; font-size: 14px; margin-bottom: 18px;
}
.pillar h3, .cap h3 { font-size: 1.1rem; margin-bottom: 10px; }
.pillar p, .cap p { color: var(--muted); font-size: 0.95rem; }

/* ── Solutions ──────────────────────────────────────── */
.solutions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.solution {
  display: flex; flex-direction: column;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; transition: border-color .15s, box-shadow .15s;
}
.solution:hover { border-color: #cfd6e2; box-shadow: 0 12px 32px -18px rgba(11, 18, 32, 0.25); }
.solution-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin-bottom: 20px; }
.tag { font-size: 12px; font-weight: 700; letter-spacing: 0.04em; color: var(--accent); }
.status {
  font-size: 12px; font-weight: 600; color: var(--muted);
  background: var(--bg-alt); border: 1px solid var(--line); padding: 2px 10px; border-radius: 999px;
}
.solution h3 { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.03em; }
.solution-desc { margin-top: 12px; color: var(--muted); }
.facts { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); display: grid; gap: 10px; }
.facts li { position: relative; padding-left: 18px; font-size: 0.95rem; }
.facts li::before {
  content: ""; position: absolute; left: 0; top: 0.72em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.link-out {
  margin-top: auto; padding-top: 28px;
  font-weight: 700; color: var(--accent); text-decoration: none; align-self: flex-start;
}
.link-out:hover { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 4px; }
.solutions-more { margin-top: 28px; text-align: right; font-size: 0.95rem; }
.solutions-more a { font-weight: 700; color: var(--muted); text-decoration: none; }
.solutions-more a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }

/* ── Cases ──────────────────────────────────────────── */
.case {
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--bg);
}
.case + .case { margin-top: 28px; }
.case-head { padding: 32px 32px 0; }
.case-no { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; color: var(--accent); }
.case-head h3 { margin-top: 10px; font-size: clamp(1.25rem, 2.4vw, 1.6rem); font-weight: 800; }
.case-product { margin-top: 8px; color: var(--muted); font-size: 0.95rem; }
.case-body {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin-top: 28px; border-top: 1px solid var(--line);
}
.case-col { padding: 28px 28px 32px; }
.case-col + .case-col { border-left: 1px solid var(--line); }
.case-col h4 {
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em; color: var(--muted);
  margin-bottom: 12px;
}
.case-col p, .case-col li { font-size: 0.93rem; }
.case-col ul { display: grid; gap: 8px; }
.case-col li { position: relative; padding-left: 16px; }
.case-col li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
/* What has NOT been validated gets its own tint — it is the column that makes
   the rest believable, so it should not look like an afterthought. */
.case-col.scope { background: #fbfaf6; }
.case-col.scope h4 { color: #8a6d1f; }
.case-col.scope p { color: #57534e; }

/* ── Engagement ─────────────────────────────────────── */
.tiers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.tier {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px 32px;
}
.tier-strong { background: var(--ink); border-color: var(--ink); color: #fff; }
.tier-strong h3 { color: #fff; }
.tier-step { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; color: var(--accent); }
.tier-strong .tier-step { color: #8fb0ff; }
.tier h3 { margin-top: 10px; font-size: 1.6rem; font-weight: 800; }
.tier-buy {
  margin-top: 20px; padding: 16px 18px; border-radius: 10px;
  background: var(--bg-alt); font-weight: 600;
}
.tier-strong .tier-buy { background: rgba(255, 255, 255, 0.07); }
.tier-buy span {
  display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  color: var(--muted); margin-bottom: 4px;
}
.tier-strong .tier-buy span { color: rgba(255, 255, 255, 0.55); }
.tier ul { margin-top: 22px; display: grid; gap: 10px; }
.tier li { position: relative; padding-left: 18px; }
.tier li::before {
  content: ""; position: absolute; left: 0; top: 0.72em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.tier-fit { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.93rem; }
.tier-strong .tier-fit { border-top-color: rgba(255, 255, 255, 0.12); color: rgba(255, 255, 255, 0.65); }

.direction {
  margin-top: 28px; padding: 28px 32px;
  border-left: 3px solid var(--accent); background: var(--bg-alt); border-radius: 0 var(--radius) var(--radius) 0;
}
.direction h3 { font-size: 1.05rem; margin-bottom: 8px; }
.direction p { color: var(--muted); }

/* ── Contact ────────────────────────────────────────── */
.contact { background: var(--bg-alt); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.steps li { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.step-no {
  display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--ink); color: #fff; font-weight: 800; font-size: 13px; margin-bottom: 14px;
}
.steps strong { display: block; color: var(--ink); font-size: 1.05rem; margin-bottom: 6px; }
.steps p { color: var(--muted); font-size: 0.93rem; }

.contact-card {
  margin-top: 32px; padding: 36px; border-radius: var(--radius);
  background: var(--ink); color: #fff;
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px;
}
.contact-label { font-size: 13px; font-weight: 700; letter-spacing: 0.08em; color: #8fb0ff; }
.contact-line { font-size: 1.25rem; font-weight: 700; }
.contact-line a { text-decoration: none; }
.contact-line a:hover { text-decoration: underline; text-underline-offset: 5px; }

/* ── Footer ─────────────────────────────────────────── */
.site-footer { background: var(--ink); color: rgba(255, 255, 255, 0.55); font-size: 14px; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px; padding-block: 36px; }
.footer-inner .wordmark { font-size: 18px; }
.copy { margin-left: auto; }

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 1000px) {
  .grid-4, .steps { grid-template-columns: repeat(2, 1fr); }
  .case-body { grid-template-columns: repeat(2, 1fr); }
  .case-col:nth-child(3) { border-left: 0; }
  .case-col:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 760px) {
  .nav a:not(.nav-cta) { display: none; }
  .hero { padding-block: 80px 64px; }
  .section { padding-block: 72px; }
  .section-head { margin-bottom: 40px; }
  .path, .solutions, .tiers { grid-template-columns: 1fr; }
  .path { margin-top: 56px; }
  .solution, .tier { padding: 28px 24px; }
  .case-head { padding: 28px 24px 0; }
  .case-body { grid-template-columns: 1fr; }
  .case-col { padding: 24px; }
  .case-col + .case-col { border-left: 0; border-top: 1px solid var(--line); }
  .contact-card { padding: 28px 24px; }
  .copy { margin-left: 0; }
}
@media (max-width: 480px) {
  .grid-4, .steps { grid-template-columns: 1fr; }
  .btn { width: 100%; }
}

/* ── Language switcher ──────────────────────────────── */
.lang {
  display: inline-flex; border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 999px;
  padding: 2px; margin-left: -8px;
}
.nav .lang a {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em; color: rgba(255, 255, 255, 0.55);
}
.nav .lang a[aria-current="true"] { background: rgba(255, 255, 255, 0.14); color: #fff; }
.nav .lang a:hover { color: #fff; }
/* On phones the text links hide; the switcher must not go with them. */
@media (max-width: 760px) {
  .nav { gap: 12px; }
  .nav .lang a { display: inline-block; }
  .lang { margin-left: 0; }
}
/* English runs longer per idea and has no keep-all concern. */
html[lang="en"] body { word-break: normal; }

/* ── Hero background ────────────────────────────────────
   Plain gradient for now — the effects were dropped, and a video is planned
   here later. When it lands: put a <video class="hero-media" autoplay muted
   loop playsinline> as the hero's first child and style it absolute/cover
   under .hero > .wrap (z-index 1 vs 0), keeping the gradient as its poster
   fallback. The .hero-bg canvas is hidden until its markup is removed. */
.hero { position: relative; overflow: hidden; }
.hero > .wrap { position: relative; z-index: 1; }
.hero-bg { display: none; }

/* ══ Interaction layer ═══════════════════════════════════════════════
   Fast by design: every transition is 200–450ms with an ease-out, so the
   page feels responsive rather than animated. Everything here is inert
   under prefers-reduced-motion. */

/* scroll progress + compact header */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 20;
  background: linear-gradient(90deg, #8fb0ff, var(--accent));
  transform-origin: 0 50%; transform: scaleX(0); pointer-events: none;
}
.site-header { transition: height .2s ease, background-color .2s ease; }
.site-header .header-inner { transition: height .2s ease; }
.site-header.compact .header-inner { height: 54px; }
.site-header.compact { background: rgba(11, 18, 32, 0.94); }

/* reveal */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .45s ease-out, transform .45s cubic-bezier(.2, .7, .2, 1); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal="2"] { transition-delay: .07s; }
[data-reveal="3"] { transition-delay: .14s; }
[data-reveal="4"] { transition-delay: .21s; }

/* hero: headline rises on load; gradient leans toward the pointer */
.hero { --hx: 78%; --hy: 20%; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(720px 480px at var(--hx) var(--hy), rgba(47, 107, 255, 0.30), transparent 62%);
  transition: opacity .3s;
}
.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .line > span { display: block; transform: translateY(110%); animation: rise .55s cubic-bezier(.2, .7, .2, 1) forwards; }
.hero h1 .line:nth-child(2) > span { animation-delay: .08s; }
.hero .lede, .hero .hero-actions, .hero .path { opacity: 0; animation: fade-up .5s ease-out forwards; }
.hero .lede { animation-delay: .22s; }
.hero .hero-actions { animation-delay: .32s; }
.hero .path { animation-delay: .42s; }
@keyframes rise { to { transform: none; } }
@keyframes fade-up { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* accent on the second headline line */
.hero h1 .accent {
  background: linear-gradient(90deg, #ffffff 0%, #bcd0ff 55%, #6f9bff 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* buttons: arrow nudges, primary lifts */
.btn { transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px -10px rgba(47, 107, 255, .8); }
.btn .arrow { display: inline-block; margin-left: 8px; transition: transform .18s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* path cards: slide in an accent bar */
.path a { position: relative; }
.path a::after { content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--accent); transition: width .25s ease; }
.path a:hover::after { width: 100%; }

/* keyword marquee */
.marquee { overflow: hidden; border-block: 1px solid var(--line); background: var(--bg); padding-block: 14px; }
.marquee-track { display: flex; gap: 40px; width: max-content; animation: marquee 28s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee span { white-space: nowrap; font-size: 13px; font-weight: 600; letter-spacing: .06em; color: var(--muted); }
.marquee span::before { content: "•"; color: var(--accent); margin-right: 40px; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* spotlight cards (pillars, caps, tiers, steps) */
.spot { position: relative; overflow: hidden; --mx: 50%; --my: 50%; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.spot::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .25s;
  background: radial-gradient(260px 260px at var(--mx) var(--my), rgba(47, 107, 255, 0.14), transparent 70%);
}
.spot:hover { transform: translateY(-3px); border-color: #c6d2ea; box-shadow: 0 16px 36px -22px rgba(11, 18, 32, .35); }
.spot:hover::before { opacity: 1; }
.tier-strong.spot::before { background: radial-gradient(280px 280px at var(--mx) var(--my), rgba(143, 176, 255, 0.18), transparent 70%); }

/* solution cards with screenshots */
.solution { padding: 0; overflow: hidden; }
.solution .shot-wrap { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: var(--ink); }
.solution .shot {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: top;
  transform-origin: center; transition: transform .25s ease-out; will-change: transform;
}
.solution .shot-wrap::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(11, 18, 32, .35));
}
.solution .body { padding: 28px 32px 32px; display: flex; flex-direction: column; flex: 1; }
.solution .solution-top { margin-bottom: 14px; }
.solutions-more { margin-top: 28px; text-align: right; }
.solutions-more a { font-weight: 700; color: var(--accent); text-decoration: none; }
.solutions-more a:hover { text-decoration: underline; text-underline-offset: 4px; }

/* facts strip: real numbers from the demos */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 56px; }
.stat { border-top: 2px solid var(--ink); padding-top: 16px; }
.stat b { display: block; font-size: clamp(2rem, 4vw, 2.75rem); font-weight: 800; letter-spacing: -0.04em; color: var(--ink); line-height: 1; font-variant-numeric: tabular-nums; }
.stat b small { font-size: .45em; font-weight: 700; color: var(--accent); margin-left: 4px; letter-spacing: 0; }
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: .93rem; }

/* case columns cascade */
.case .case-col { transition: background .2s; }
.case .case-col:hover { background: var(--bg-alt); }
.case .case-col.scope:hover { background: #f6f2e6; }

@media (max-width: 760px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .solution .body { padding: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .hero h1 .line > span, .hero .lede, .hero .hero-actions, .hero .path { animation: none; opacity: 1; transform: none; }
  .marquee-track { animation: none; }
  .spot, .btn, .solution .shot { transition: none; }
}