/* Colors follow the app's DESIGN.md: cool near-black canvas, a four-step
   surface ladder, 1px hairlines instead of shadows, and one accent. */
:root {
  --canvas: #070809;
  --surface-1: #0f1011;
  --surface-2: #141516;
  --surface-3: #18191a;
  --hairline: #23252a;
  --accent: #5e6ad2;
  --accent-hover: #828fff;
  --link: #809ff9;
  --ink: #f7f8f8;
  --body: #d0d6e0;
  --mute: #8a8f98;
  --success: #4aaf78;
  --sans: Inter, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --page: 1120px;
  --radius: 8px;
}

* { box-sizing: border-box; }

html { color-scheme: dark; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

:lang(ko) body, body:lang(ko) { word-break: keep-all; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

img { max-width: 100%; height: auto; display: block; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  color: var(--ink);
}

pre {
  margin: 0;
  overflow-x: auto;
  font: 14px/1.6 var(--mono);
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--ink);
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; }

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

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; background: var(--surface-3); padding: 8px 12px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: rgba(7, 8, 9, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.site-header .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 6px; }
.site-nav { display: flex; gap: 20px; margin-left: auto; align-items: center; font-size: 14px; }
.site-nav a { color: var(--body); }
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav .lang { color: var(--mute); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius);
  font-weight: 500; font-size: 15px; line-height: 1.2;
  border: 1px solid var(--hairline); color: var(--ink); background: var(--surface-2);
}
.btn:hover { text-decoration: none; background: var(--surface-3); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

/* Hero */
.hero { padding: 88px 0 40px; text-align: center; }
.hero h1 {
  margin: 0 auto 16px; max-width: 820px;
  color: var(--ink); font-size: clamp(34px, 5.4vw, 56px); line-height: 1.1; letter-spacing: -0.02em;
}
.tagline { margin: 0 0 12px; color: var(--accent-hover); font-weight: 600; font-size: 15px; letter-spacing: 0.02em; }
.lede { margin: 0 auto 32px; max-width: 680px; font-size: 18px; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.cta-note { margin: 14px 0 0; font-size: 13px; color: var(--mute); }
.hero-shot {
  margin: 56px auto 0; border: 1px solid var(--hairline); border-radius: 12px; overflow: hidden;
  background: var(--surface-1);
}

/* Sections */
section { padding: 72px 0; border-top: 1px solid var(--hairline); }
.hero + section { border-top: 0; }
h2 { margin: 0 0 12px; color: var(--ink); font-size: clamp(26px, 3.4vw, 34px); line-height: 1.2; letter-spacing: -0.01em; }
h3 { margin: 0 0 8px; color: var(--ink); font-size: 19px; line-height: 1.35; }
.section-lede { margin: 0 0 40px; max-width: 720px; font-size: 17px; }
.eyebrow { margin: 0 0 10px; color: var(--mute); font-size: 12px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--surface-1); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 22px; }
.card p { margin: 0; font-size: 15px; }

/* Feature rows: text beside a screenshot, alternating sides. */
.feature { display: grid; grid-template-columns: 5fr 7fr; gap: 40px; align-items: center; padding: 28px 0; }
.feature:nth-of-type(even) .feature-text { order: 2; }
.feature-text p { margin: 0; }
.feature figure { margin: 0; border: 1px solid var(--hairline); border-radius: var(--radius); overflow: hidden; }

.also { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px 32px; margin: 32px 0 0; padding: 0; list-style: none; }
.also li { padding: 12px 0; border-bottom: 1px solid var(--hairline); font-size: 15px; }
.also strong { color: var(--ink); font-weight: 600; }

.agents { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 20px; padding: 0; list-style: none; }
.agents li { background: var(--surface-2); border: 1px solid var(--hairline); border-radius: 999px; padding: 4px 12px; font-size: 14px; color: var(--ink); }

/* Install */
.platforms { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.platform { background: var(--surface-1); border: 1px solid var(--hairline); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.platform.is-current { border-color: var(--accent); }
.platform p { margin: 0; font-size: 15px; }
.platform .btn { align-self: flex-start; }
.platform .file { font-family: var(--mono); font-size: 13px; color: var(--mute); word-break: break-all; }
.notes { margin-top: 32px; display: grid; gap: 16px; }
.notes p { margin: 0; }

ol.steps { margin: 0; padding-left: 22px; }
ol.steps li { margin: 0 0 10px; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--hairline); padding: 16px 0; }
.faq summary { cursor: pointer; color: var(--ink); font-weight: 600; font-size: 17px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--mute); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 10px 0 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--hairline); padding: 40px 0 56px; font-size: 14px; color: var(--mute); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
.site-footer a { color: var(--body); }

@media (max-width: 820px) {
  .site-nav a:not(.lang):not(.gh) { display: none; }
  .feature { grid-template-columns: 1fr; gap: 20px; }
  .feature:nth-of-type(even) .feature-text { order: 0; }
  .hero { padding-top: 56px; }
  section { padding: 56px 0; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }