:root {
  --bg: #ffffff;
  --gray: #f5f6f8;
  --gray-2: #eceef1;
  --border: #e4e6ea;
  --ink: #1c1f24;
  --muted: #6b7280;
  --accent: #62b22f;
  --accent-dark: #4f9624;
  --accent-soft: #eef6e7;
  --dark: #14181c;
  --r: 12px;
  --maxw: 1200px;
  --shadow: 0 6px 24px rgba(20, 24, 28, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Pretendard", "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.container-narrow { max-width: 760px; }
.accent-text { color: var(--accent); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: .95rem; border-radius: 8px; padding: 11px 20px;
  border: 1px solid transparent; cursor: pointer; transition: all .18s; white-space: nowrap;
}
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--ink); }
.btn-outline:hover { border-color: var(--ink); }
.btn-lg { padding: 15px 30px; font-size: 1.02rem; }

/* Topbar */
.topbar { background: var(--dark); color: #fff; font-size: .85rem; }
.topbar-inner { display: flex; align-items: center; justify-content: center; gap: 16px; height: 40px; }
.topbar-text { opacity: .92; }
.topbar-link { color: var(--accent); font-weight: 600; }
.topbar-link:hover { text-decoration: underline; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 36px; height: 68px; }
.logo { font-family: "Inter", sans-serif; font-weight: 800; font-size: 1.5rem; letter-spacing: -.03em; color: var(--ink); }
.logo-dot { color: var(--accent); }
.nav { display: flex; gap: 28px; flex: 1; }
.nav a { font-size: .95rem; font-weight: 500; color: var(--ink); transition: color .18s; }
.nav a:hover { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.icon-btn {
  width: 40px; height: 40px; display: grid; place-items: center; border-radius: 8px;
  background: var(--gray); border: 0; color: var(--ink); cursor: pointer; transition: background .18s;
}
.icon-btn:hover { background: var(--gray-2); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: .3s; }

/* Hero */
.hero { padding: 64px 0 56px; }
.hero-inner { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero-season { font-family: "Inter", sans-serif; font-size: .8rem; font-weight: 700; letter-spacing: .18em; color: var(--accent); }
.hero-copy h1 { font-size: clamp(2.3rem, 4.5vw, 3.4rem); font-weight: 800; line-height: 1.14; letter-spacing: -.03em; margin: 16px 0 18px; }
.hero-copy p { color: var(--muted); font-size: 1.08rem; margin-bottom: 28px; }

.countdown { display: flex; align-items: center; gap: 10px; margin-bottom: 30px; }
.cd-box {
  background: var(--dark); color: #fff; border-radius: 10px; padding: 12px 14px;
  display: flex; flex-direction: column; align-items: center; min-width: 64px;
}
.cd-box strong { font-family: "Inter", sans-serif; font-size: 1.7rem; font-weight: 700; line-height: 1; }
.cd-box span { font-size: .72rem; color: #9aa3ad; margin-top: 5px; }
.cd-sep { font-size: 1.5rem; font-weight: 700; color: var(--gray-2); }

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-visual { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 14px; height: 420px; }
.hero-render { border-radius: var(--r); position: relative; overflow: hidden; box-shadow: var(--shadow); }
.hero-render span {
  position: absolute; left: 16px; bottom: 14px; color: #fff; font-weight: 600; font-size: .9rem;
  text-shadow: 0 1px 6px rgba(0,0,0,.4);
}
.hero-render.r1 { grid-row: 1 / 3; background: linear-gradient(140deg, #1b3a2e, #2f7d52 55%, #62b22f); }
.hero-render.r2 { background: linear-gradient(140deg, #2a1a4d, #6d3bd1 60%, #b07bff); }
.hero-render.r3 { background: linear-gradient(140deg, #07304a, #1287c4 60%, #36d0e0); }

/* Stats strip */
.stats-strip { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--gray); }
.stats-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 26px 0; text-align: center; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-family: "Inter", sans-serif; font-size: 2.1rem; font-weight: 800; color: var(--accent); line-height: 1; }
.stat span { font-size: .9rem; color: var(--muted); margin-top: 6px; display: block; }

/* Sections */
.section { padding: 76px 0; }
.section-gray { background: var(--gray); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 38px; }
.section-head.center { justify-content: center; text-align: center; }
.eyebrow { font-family: "Inter", sans-serif; font-size: .76rem; font-weight: 700; letter-spacing: .16em; color: var(--accent); }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -.02em; margin-top: 8px; }
.head-link { font-size: .92rem; font-weight: 600; color: var(--muted); transition: color .18s; }
.head-link:hover { color: var(--accent); }

/* Product grid (curriculum) */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r); overflow: hidden;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.thumb { aspect-ratio: 4 / 3; position: relative; }
.thumb-badge {
  position: absolute; top: 12px; left: 12px; background: rgba(0,0,0,.55); color: #fff;
  font-family: "Inter", sans-serif; font-size: .72rem; font-weight: 700; letter-spacing: .08em;
  padding: 5px 10px; border-radius: 6px; backdrop-filter: blur(4px);
}
.thumb.t1 { background: linear-gradient(135deg, #163a2c, #43a05f); }
.thumb.t2 { background: linear-gradient(135deg, #2a1a4d, #7d4bd1); }
.thumb.t3 { background: linear-gradient(135deg, #06304a, #1796c4); }
.thumb.t4 { background: linear-gradient(135deg, #4a2a08, #d18a2f); }
.card-body { padding: 20px 20px 18px; }
.card-body h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 9px; letter-spacing: -.01em; }
.card-body p { font-size: .9rem; color: var(--muted); min-height: 54px; }
.card-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 14px; }
.tag { background: var(--accent-soft); color: var(--accent-dark); font-size: .78rem; font-weight: 700; padding: 4px 11px; border-radius: 999px; }
.meta-arrow { color: var(--muted); font-weight: 700; transition: transform .2s, color .2s; }
.product-card:hover .meta-arrow { color: var(--accent); transform: translateX(4px); }

/* Tool grid */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tool-card {
  display: flex; align-items: center; gap: 16px; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--r); padding: 20px 22px;
  transition: transform .2s, box-shadow .2s;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.tool-card strong { font-size: 1.05rem; display: block; }
.tool-card small { color: var(--muted); font-size: .84rem; }
.sw {
  flex: 0 0 52px; height: 52px; border-radius: 11px; display: grid; place-items: center;
  font-family: "Inter", sans-serif; font-weight: 800; font-size: 1.15rem; color: #fff;
}
.sw-ae { background: #00005b; color: #9a9aff; }
.sw-bl { background: #ea7600; }
.sw-ue { background: #0e1015; }
.sw-ff { background: linear-gradient(135deg, #ff3366, #ffcc00); }
.sw-mj { background: #1a1a1a; }
.sw-sd { background: #7a3ff2; }

/* Feature grid */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature { background: var(--bg); border: 1px solid var(--border); border-radius: var(--r); padding: 32px 28px; transition: box-shadow .2s, transform .2s; }
.feature:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.feature-ic { font-size: 2.2rem; margin-bottom: 16px; }
.feature h3 { font-size: 1.18rem; margin-bottom: 10px; }
.feature p { color: var(--muted); font-size: .95rem; }

/* Info grid */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; background: var(--bg); border: 1px solid var(--border); border-radius: var(--r); overflow: hidden; }
.info-item { padding: 24px 28px; border-bottom: 1px solid var(--border); border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: 6px; }
.info-item:nth-child(2n) { border-right: 0; }
.info-item:last-child { grid-column: 1 / -1; border-bottom: 0; border-right: 0; }
.info-label { font-family: "Inter", sans-serif; font-size: .78rem; font-weight: 700; letter-spacing: .08em; color: var(--accent); text-transform: uppercase; }
.info-val { font-size: 1.1rem; font-weight: 600; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg); }
.faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer; font-family: inherit;
  padding: 20px 24px; font-size: 1.02rem; font-weight: 600; color: var(--ink);
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-arrow { color: var(--accent); font-size: 1.4rem; font-weight: 400; transition: transform .3s; flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 24px 22px; color: var(--muted); font-size: .96rem; }

/* Apply */
.apply { background: var(--dark); color: #fff; padding: 90px 0; text-align: center; }
.apply h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800; letter-spacing: -.02em; }
.apply p { color: #aab2bc; margin: 16px auto 36px; max-width: 520px; font-size: 1.05rem; }
.apply-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.apply .btn-outline { color: #fff; border-color: rgba(255,255,255,.3); }
.apply .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.08); }

/* Footer */
.site-footer { background: #0f1316; color: #c4ccd4; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; padding: 56px 28px 40px; }
.logo-light { color: #fff; }
.footer-brand p { color: #8b949e; font-size: .9rem; margin-top: 12px; }
.footer-col h4 { font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; color: #fff; margin-bottom: 16px; }
.footer-col a { display: block; color: #8b949e; font-size: .92rem; padding: 5px 0; transition: color .18s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0; font-size: .85rem; color: #6b7480; }

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

/* Responsive */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-visual { height: 320px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .nav { position: fixed; top: 108px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border); padding: 8px 0;
    transform: translateY(-130%); transition: transform .32s; flex: none; box-shadow: var(--shadow); }
  .nav.open { transform: none; }
  .nav a { padding: 14px 28px; }
  .nav-toggle { display: flex; }
  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .tool-grid, .feature-grid, .info-grid { grid-template-columns: 1fr; }
  .info-item, .info-item:nth-child(2n) { border-right: 0; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--border); }
  .topbar-text { font-size: .76rem; }
  .section-head { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 460px) {
  .product-grid { grid-template-columns: 1fr; }
  .cd-box { min-width: 54px; padding: 10px; }
  .cd-box strong { font-size: 1.4rem; }
  .topbar-link { display: none; }
}