/* ============================================================
   FDE Academy — 랜딩페이지 프리미엄 테마
   ============================================================ */
:root {
  --ac-ink: #0a0e14;
  --ac-ink-2: #262c36;
  --ac-muted: #515a6b;
  --ac-line: #e6e8ee;
  --ac-bg: #f7f8fb;
  --ac-card: #ffffff;
  --ac-navy: #0b1020;
  --ac-navy-2: #141b34;
  --ac-gold: #c9a84c;
  --ac-gold-soft: #e8c96d;
  --ac-blue: #2563eb;
  --ac-violet: #7c3aed;
  --ac-teal: #0d9488;
  --ac-amber: #d97706;
  --ac-fire: #dc2626;
  --ac-green: #059669;
  --ac-radius: 18px;
  --ac-shadow: 0 14px 40px rgba(13, 17, 23, .08);
  --ac-shadow-lg: 0 30px 70px rgba(11, 16, 32, .22);
  --ac-font: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.ac {
  margin: 0; font-family: var(--ac-font); color: var(--ac-ink);
  background: var(--ac-bg); line-height: 1.75; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; letter-spacing: -.003em;
}
.ac-wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
img { max-width: 100%; display: block; }

/* ---------- Top nav ---------- */
.ac-nav {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; background: rgba(11, 16, 32, .9); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201, 168, 76, .25);
}
.ac-nav .brand { display: flex; align-items: center; gap: 11px; color: #fff; text-decoration: none; font-weight: 900; font-size: 17px; letter-spacing: .01em; }
.ac-nav .brand .mark { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); display: grid; place-items: center; color: #0b1020; font-weight: 900; font-size: 15px; }
.ac-nav .brand small { display: block; font-size: 12px; font-weight: 600; color: var(--ac-gold-soft); letter-spacing: .12em; }
.ac-navlinks { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.ac-navlinks a { color: #cbd5e1; text-decoration: none; font-size: 13px; font-weight: 700; padding: 8px 14px; border-radius: 999px; transition: .18s; }
.ac-navlinks a:hover { color: #fff; background: rgba(201, 168, 76, .16); }
.ac-navlinks a.cta { background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); color: #0b1020; font-weight: 800; }
.ac-navlinks a.cta:hover { filter: brightness(1.06); }

/* ---------- Hero ---------- */
.ac-hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(201, 168, 76, .22), transparent 60%),
    radial-gradient(700px 480px at 5% 10%, rgba(37, 99, 235, .18), transparent 55%),
    linear-gradient(160deg, #0b1020 0%, #141b34 55%, #1c2547 100%);
  padding: 84px 0 92px;
}
.ac-hero::after { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px); background-size: 34px 34px; opacity: .5; pointer-events: none; }
.ac-hero .ac-wrap { position: relative; z-index: 2; }
.ac-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(201, 168, 76, .16); border: 1px solid rgba(201, 168, 76, .5); color: var(--ac-gold-soft); font-size: 12.5px; font-weight: 800; letter-spacing: .06em; padding: 7px 16px; border-radius: 999px; margin-bottom: 22px; }
.ac-hero h1 { font-size: 46px; line-height: 1.24; font-weight: 900; margin: 0 0 20px; letter-spacing: -.01em; max-width: 940px; }
.ac-hero h1 .hl { color: var(--ac-gold-soft); }
.ac-hero .sub { font-size: 17px; color: #c3cbe0; max-width: 760px; margin: 0 0 32px; }
.ac-hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 44px; }
.ac-btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 800; font-size: 15px; padding: 14px 26px; border-radius: 12px; transition: .2s; }
.ac-btn.primary { background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); color: #0b1020; box-shadow: 0 12px 30px rgba(201, 168, 76, .3); }
.ac-btn.primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(201, 168, 76, .4); }
.ac-btn.ghost { background: rgba(255, 255, 255, .06); color: #fff; border: 1px solid rgba(255, 255, 255, .22); }
.ac-btn.ghost:hover { background: rgba(255, 255, 255, .12); transform: translateY(-2px); }
.ac-hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.ac-hero-stats > div strong { display: block; font-size: 32px; font-weight: 900; color: var(--ac-gold-soft); line-height: 1.1; }
.ac-hero-stats > div span { font-size: 12.5px; color: #9aa5c0; }

/* ---------- Section base ---------- */
.ac-sec { padding: 84px 0; }
.ac-sec.alt { background: #fff; }
.ac-sec.dark { background: linear-gradient(160deg, #0b1020, #141b34); color: #fff; }
.ac-sec-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.ac-kicker { display: inline-block; font-size: 12.5px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; color: var(--ac-gold); margin-bottom: 14px; }
.ac-sec.dark .ac-kicker { color: var(--ac-gold-soft); }
.ac-sec h2 { font-size: 33px; font-weight: 900; margin: 0 0 16px; line-height: 1.32; letter-spacing: -.01em; }
.ac-sec .lead { font-size: 16px; color: var(--ac-muted); margin: 0; }
.ac-sec.dark .lead { color: #b6c0d8; }

/* pain points */
.ac-pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; max-width: 900px; margin: 0 auto 34px; }
.ac-pain { display: flex; gap: 14px; align-items: flex-start; background: #fff; border: 1px solid var(--ac-line); border-radius: 14px; padding: 20px 22px; }
.ac-pain .q { flex: none; width: 30px; height: 30px; border-radius: 9px; background: #fef2f2; color: var(--ac-fire); display: grid; place-items: center; font-weight: 900; font-size: 15px; }
.ac-pain p { margin: 0; font-size: 14.5px; color: var(--ac-ink-2); font-weight: 600; }
.ac-insight { max-width: 900px; margin: 0 auto; background: linear-gradient(135deg, #0b1020, #141b34); color: #fff; border: 1px solid rgba(201,168,76,.35); border-radius: 16px; padding: 28px 32px; font-size: 16px; line-height: 1.8; }
.ac-insight strong { color: var(--ac-gold-soft); }

/* cards grid */
.ac-cards { display: grid; gap: 22px; }
.ac-cards.c2 { grid-template-columns: repeat(2, 1fr); }
.ac-cards.c3 { grid-template-columns: repeat(3, 1fr); }
.ac-cards.c4 { grid-template-columns: repeat(4, 1fr); }
.ac-card { background: var(--ac-card); border: 1px solid var(--ac-line); border-radius: var(--ac-radius); padding: 28px; box-shadow: var(--ac-shadow); transition: .25s; }
.ac-card:hover { transform: translateY(-5px); box-shadow: var(--ac-shadow-lg); }
.ac-card .ic { width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center; font-size: 23px; margin-bottom: 16px; background: #f1f5f9; }
.ac-card h3 { font-size: 18px; font-weight: 800; margin: 0 0 10px; }
.ac-card p { font-size: 14px; color: var(--ac-muted); margin: 0; line-height: 1.7; }
.ac-card .num { font-size: 13px; font-weight: 900; color: var(--ac-gold); letter-spacing: .1em; }
.ac-card.dark { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.1); color: #fff; }
.ac-card.dark h3 { color: #fff; }
.ac-card.dark p { color: #b6c0d8; }

/* accent tops */
.ac-card.top-blue { border-top: 4px solid var(--ac-blue); }
.ac-card.top-violet { border-top: 4px solid var(--ac-violet); }
.ac-card.top-teal { border-top: 4px solid var(--ac-teal); }
.ac-card.top-amber { border-top: 4px solid var(--ac-amber); }
.ac-card.top-fire { border-top: 4px solid var(--ac-fire); }
.ac-card.top-green { border-top: 4px solid var(--ac-green); }
.ic.blue { background: #eff6ff; } .ic.violet { background: #f5f3ff; } .ic.teal { background: #f0fdfa; }
.ic.amber { background: #fffbeb; } .ic.fire { background: #fef2f2; } .ic.green { background: #ecfdf5; }

/* checklist */
.ac-checklist { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px 26px; max-width: 960px; margin: 0 auto; }
.ac-checklist li { list-style: none; display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--ac-ink-2); font-weight: 600; }
.ac-checklist li::before { content: "✓"; flex: none; width: 22px; height: 22px; border-radius: 50%; background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); color: #0b1020; display: grid; place-items: center; font-size: 12px; font-weight: 900; margin-top: 1px; }
ul.ac-checklist { padding: 0; }

/* differentiators (numbered) */
.ac-diff { display: grid; grid-template-columns: repeat(1, 1fr); gap: 0; max-width: 940px; margin: 0 auto; }
.ac-diff-item { display: flex; gap: 22px; padding: 26px 0; border-bottom: 1px solid var(--ac-line); }
.ac-diff-item:last-child { border-bottom: 0; }
.ac-diff-item .n { flex: none; width: 52px; height: 52px; border-radius: 14px; background: linear-gradient(135deg, #0b1020, #141b34); color: var(--ac-gold-soft); display: grid; place-items: center; font-size: 20px; font-weight: 900; }
.ac-diff-item h3 { font-size: 18px; font-weight: 800; margin: 4px 0 8px; }
.ac-diff-item p { margin: 0; font-size: 14.5px; color: var(--ac-muted); }

/* audience */
.ac-aud { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.ac-aud-card { background: #fff; border: 1px solid var(--ac-line); border-radius: 16px; padding: 24px; box-shadow: var(--ac-shadow); }
.ac-aud-card .tag { display: inline-block; font-size: 12px; font-weight: 800; padding: 5px 12px; border-radius: 999px; margin-bottom: 12px; }
.ac-aud-card h3 { font-size: 17px; margin: 0 0 8px; }
.ac-aud-card p { font-size: 13.5px; color: var(--ac-muted); margin: 0; line-height: 1.7; }

/* books */
.ac-books { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.ac-book { display: flex; gap: 22px; background: #fff; border: 1px solid var(--ac-line); border-radius: 18px; padding: 26px; box-shadow: var(--ac-shadow); }
.ac-book .spine { flex: none; width: 92px; border-radius: 10px; background: linear-gradient(160deg, #141b34, #0b1020); display: flex; align-items: center; justify-content: center; padding: 14px 8px; box-shadow: 0 10px 24px rgba(11,16,32,.3); border: 1px solid rgba(201,168,76,.3); }
.ac-book .spine span { writing-mode: vertical-rl; color: var(--ac-gold-soft); font-weight: 800; font-size: 14px; letter-spacing: .04em; }
.ac-book h3 { font-size: 18px; margin: 0 0 6px; }
.ac-book .by { font-size: 12.5px; color: var(--ac-gold); font-weight: 700; margin: 0 0 12px; }
.ac-book ul { padding: 0 0 0 4px; margin: 0; list-style: none; }
.ac-book li { font-size: 13.5px; color: var(--ac-ink-2); padding: 4px 0 4px 18px; position: relative; }
.ac-book li::before { content: ""; position: absolute; left: 2px; top: 12px; width: 6px; height: 6px; border-radius: 50%; background: var(--ac-gold); }

/* curriculum timeline */
.ac-curri { max-width: 940px; margin: 0 auto; }
.ac-step { display: flex; gap: 24px; padding: 24px 0; }
.ac-step .lv { flex: none; width: 116px; }
.ac-step .lv .badge { display: inline-block; font-size: 12px; font-weight: 900; color: #0b1020; background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); padding: 5px 12px; border-radius: 8px; }
.ac-step .lv .dur { display: block; margin-top: 8px; font-size: 12px; color: var(--ac-muted); }
.ac-step .body { flex: 1; border-left: 2px solid var(--ac-line); padding-left: 24px; padding-bottom: 4px; position: relative; }
.ac-step .body::before { content: ""; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--ac-gold); border: 2px solid #fff; }
.ac-step .body h3 { font-size: 17px; margin: 0 0 6px; }
.ac-step .body p { font-size: 14px; color: var(--ac-muted); margin: 0; }

/* level chips */
.ac-levels { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; max-width: 980px; margin: 34px auto 0; }
.ac-level { text-align: center; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); border-radius: 14px; padding: 20px 12px; }
.ac-level .lv { font-size: 22px; font-weight: 900; color: var(--ac-gold-soft); }
.ac-level .nm { font-size: 13px; color: #cbd5e1; margin-top: 6px; font-weight: 700; }

/* use cases */
.ac-use { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ac-use-card { border-radius: 18px; padding: 28px; color: #fff; position: relative; overflow: hidden; box-shadow: var(--ac-shadow); }
.ac-use-card.fire { background: linear-gradient(150deg, #7c1d1d, #dc2626); }
.ac-use-card.violet { background: linear-gradient(150deg, #4c1d95, #7c3aed); }
.ac-use-card.teal { background: linear-gradient(150deg, #134e4a, #0d9488); }
.ac-use-card .emo { font-size: 30px; margin-bottom: 12px; }
.ac-use-card h3 { font-size: 20px; margin: 0 0 4px; }
.ac-use-card .role { font-size: 12.5px; opacity: .85; font-weight: 700; margin: 0 0 12px; }
.ac-use-card p { font-size: 13.5px; margin: 0 0 14px; opacity: .95; line-height: 1.7; }
.ac-use-card a { color: #fff; font-weight: 800; font-size: 13px; text-decoration: none; border-bottom: 2px solid rgba(255,255,255,.5); padding-bottom: 2px; }

/* vision / cta band */
.ac-vision { text-align: center; max-width: 820px; margin: 0 auto; }
.ac-vision p { font-size: 17px; color: #c3cbe0; line-height: 1.9; }
.ac-vision .big { font-size: 26px; font-weight: 900; color: #fff; margin: 22px 0; line-height: 1.5; }
.ac-vision .big .hl { color: var(--ac-gold-soft); }
.ac-cta-band { text-align: center; }
.ac-cta-band h2 { font-size: 34px; margin-bottom: 14px; }
.ac-cta-band p { font-size: 16px; color: #b6c0d8; margin-bottom: 30px; }

/* footer */
.ac-foot { background: #060912; color: #8b95ad; padding: 48px 0 40px; }
.ac-foot .ac-wrap { display: flex; justify-content: space-between; gap: 28px; flex-wrap: wrap; align-items: flex-start; }
.ac-foot .fbrand { display: flex; align-items: center; gap: 12px; color: #fff; font-weight: 900; font-size: 16px; }
.ac-foot .fbrand .mark { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--ac-gold), var(--ac-gold-soft)); display: grid; place-items: center; color: #0b1020; font-weight: 900; }
.ac-foot p { font-size: 12.5px; margin: 10px 0 0; max-width: 420px; line-height: 1.7; }
.ac-foot .flinks { display: flex; gap: 26px; flex-wrap: wrap; }
.ac-foot .flinks a { color: #b6c0d8; text-decoration: none; font-size: 13px; font-weight: 600; }
.ac-foot .flinks a:hover { color: var(--ac-gold-soft); }
.ac-foot .copy { width: 100%; border-top: 1px solid #1a2233; margin-top: 30px; padding-top: 22px; font-size: 12px; color: #5b6478; }

/* reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 960px) {
  .ac-cards.c3, .ac-cards.c4, .ac-aud, .ac-use, .ac-books, .ac-pain-grid { grid-template-columns: 1fr; }
  .ac-checklist { grid-template-columns: 1fr 1fr; }
  .ac-levels { grid-template-columns: repeat(2, 1fr); }
  .ac-hero h1 { font-size: 33px; }
  .ac-sec { padding: 60px 0; }
  .ac-sec h2 { font-size: 26px; }
}
@media (max-width: 560px) {
  .ac-checklist { grid-template-columns: 1fr; }
  .ac-levels { grid-template-columns: 1fr; }
  .ac-cards.c2 { grid-template-columns: 1fr; }
  .ac-nav .ac-navlinks { display: none; }
  .ac-hero h1 { font-size: 27px; }
}