:root {
  --bg0: #0b0f14; --bg1: #121820; --line: rgba(255,255,255,.08); --line2: rgba(255,255,255,.14);
  --text: #eef2f7; --muted: #8b97a7; --dim: #5f6b7a; --accent: #00a6b2; --accent-ink: #062a2d; --blue: #4f8cff; --amber: #ffd447; --navy: #123b5d;
  --font: "Pretendard", "Malgun Gothic", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg0); color: var(--text); font-family: var(--font); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
.muted { color: var(--muted); } .small { font-size: 13px; } .center { text-align: center; margin-top: 28px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.btn { display: inline-flex; align-items: center; gap: 8px; border-radius: 12px; padding: 10px 18px; font-size: 15px; font-weight: 600; border: 1px solid var(--line2); background: rgba(255,255,255,.06); color: var(--text); cursor: pointer; transition: all .15s; font-family: inherit; }
.btn:hover { background: rgba(255,255,255,.11); transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; box-shadow: 0 8px 24px rgba(0,166,178,.25); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.lg { padding: 14px 24px; font-size: 17px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.site-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px; padding: 14px 6vw; background: rgba(11,15,20,.8); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }
.brand img { border-radius: 9px; } .brand small { color: var(--dim); font-weight: 500; font-size: 12px; margin-top: 4px; }
.brand .on { color: var(--accent); }
.brand.small { font-size: 16px; }
.site-nav { display: flex; gap: 22px; margin-left: 12px; color: var(--muted); font-size: 15px; }
.site-nav a:hover { color: var(--text); }
.header-cta { margin-left: auto; display: flex; gap: 10px; }

/* 히어로 */
.hero { position: relative; overflow: hidden; display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; padding: 64px 6vw 48px; }
.hero > * { position: relative; z-index: 1; }
.aurora { position: absolute; inset: 0; z-index: 0; pointer-events: none; filter: blur(60px); opacity: .55; }
.aurora i { position: absolute; border-radius: 50%; background: radial-gradient(circle, rgba(0,166,178,.55), transparent 65%); animation: drift 18s ease-in-out infinite alternate; }
.aurora i:nth-child(1) { width: 640px; height: 640px; left: -140px; top: -220px; }
.aurora i:nth-child(2) { width: 520px; height: 520px; right: -120px; top: -80px; background: radial-gradient(circle, rgba(18,59,93,.9), transparent 65%); animation-duration: 24s; animation-delay: -6s; }
.aurora i:nth-child(3) { width: 460px; height: 460px; left: 40%; bottom: -260px; animation-duration: 21s; animation-delay: -12s; background: radial-gradient(circle, rgba(255,212,71,.22), transparent 65%); }
@keyframes drift { from { transform: translate(0, 0) scale(1); } to { transform: translate(60px, 40px) scale(1.12); } }
.dots { position: absolute; inset: 0; z-index: 0; pointer-events: none; background-image: radial-gradient(rgba(255,255,255,.12) 1px, transparent 1.5px); background-size: 26px 26px; mask-image: linear-gradient(180deg, rgba(0,0,0,.6), transparent 85%); -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.6), transparent 85%); }
.hero-toggle { display: inline-flex; align-items: center; gap: 10px; color: var(--accent); margin-bottom: 14px; font-size: 13px; font-weight: 600; letter-spacing: .2px; }
.hero-toggle .tg-track { fill: currentColor; opacity: 0; animation: trackOn .6s ease .9s forwards; }
.hero-toggle .tg-knob { transform: translateX(-40px); animation: knobOn .7s cubic-bezier(.2,.9,.3,1.2) .5s forwards; }
.hero-toggle span { opacity: 0; animation: fadeIn .5s ease 1.2s forwards; }
@keyframes knobOn { to { transform: translateX(0); } }
@keyframes trackOn { to { opacity: .28; } }
@keyframes fadeIn { to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .aurora i, .hero-toggle .tg-knob, .hero-toggle .tg-track, .hero-toggle span { animation: none; transform: none; opacity: 1; } .hero-toggle .tg-track { opacity: .28; } }
.eyebrow { display: inline-block; font-size: 13px; color: var(--amber); background: rgba(255,212,71,.1); border: 1px solid rgba(255,212,71,.35); padding: 4px 12px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(34px, 4.6vw, 58px); line-height: 1.15; margin: 0 0 18px; letter-spacing: -1px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { font-size: 18px; color: #c9d2de; max-width: 520px; margin: 0 0 26px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-stats { list-style: none; padding: 0; margin: 34px 0 0; display: flex; gap: 28px; flex-wrap: wrap; }
.hero-stats b { display: block; font-size: 26px; } .hero-stats span { font-size: 13px; color: var(--muted); }
.device { position: relative; border-radius: 18px; border: 1px solid var(--line2); background: var(--bg1); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.5); aspect-ratio: 16 / 10; }
.device iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; }
.caption { text-align: center; color: var(--dim); font-size: 13px; margin-top: 10px; }

/* 단어 마키 */
.marquee { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg1); padding: 12px 0; }
.marquee-track { display: flex; gap: 10px; width: max-content; animation: marquee 60s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.chip { display: inline-flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line2); background: rgba(255,255,255,.04); color: var(--text); font-size: 14px; white-space: nowrap; transition: all .15s; }
.chip:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,166,178,.08); }
.chip svg { color: var(--accent); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* 섹션 공통 */
.section { padding: 72px 6vw; }
.section.alt { background: linear-gradient(180deg, #10233a 0%, #0e1a2b 100%); border-top: 1px solid rgba(18,59,93,.8); border-bottom: 1px solid rgba(18,59,93,.8); }
.section h2 { font-size: clamp(26px, 3vw, 36px); margin: 0 0 14px; letter-spacing: -.5px; }
.lead { color: var(--muted); font-size: 17px; max-width: 720px; margin: 0 0 32px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.feat { background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 16px; padding: 22px; transition: transform .15s, border-color .15s; }
.feat:hover { transform: translateY(-3px); border-color: var(--line2); }
.feat .ic { font-size: 28px; margin-bottom: 10px; }
.feat .ic svg { width: 30px; height: 30px; color: var(--accent); }
.feat h3 { margin: 0 0 6px; font-size: 18px; } .feat p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* 스크린샷 갤러리 */
.shots { display: grid; grid-template-columns: 2fr 1fr 1fr; grid-auto-rows: 220px; gap: 14px; margin-top: 28px; }
.shot { position: relative; border-radius: 16px; overflow: hidden; border: 1px solid var(--line2); background: var(--bg1); display: block; }
.shot.big { grid-row: span 2; }
.shot img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; transition: transform .4s ease; }
.shot:hover img { transform: scale(1.04); }
.shot span { position: absolute; left: 12px; bottom: 12px; background: rgba(11,15,20,.72); backdrop-filter: blur(8px); border: 1px solid var(--line2); color: var(--text); font-size: 13px; font-weight: 600; padding: 6px 11px; border-radius: 999px; }

/* 3단계 */
.steps { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.steps li { position: relative; background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 18px; padding: 18px 22px 22px; }
.steps .ill { width: 100%; height: 190px; display: block; margin-bottom: 10px; object-fit: cover; border-radius: 12px; background: #0e1a2b; }
.steps b { position: absolute; top: 14px; left: 16px; width: 30px; height: 30px; border-radius: 9px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-size: 14px; }
.steps h3 { margin: 0 0 6px; font-size: 18px; } .steps p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* 코스 */
.levels { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.levels li { display: flex; gap: 14px; background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.levels b { width: 38px; height: 38px; flex: none; border-radius: 11px; background: linear-gradient(135deg, var(--accent), #007f88); color: var(--accent-ink); display: grid; place-items: center; font-size: 18px; }
.levels h3 { margin: 0 0 4px; font-size: 17px; } .levels p { margin: 0; color: var(--muted); font-size: 14px; }

/* 따라하기 소개 */
.split { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.split p { color: #c9d2de; }
.checks { list-style: none; padding: 0; margin: 18px 0 24px; }
.checks li { padding-left: 28px; position: relative; margin: 8px 0; color: var(--muted); }
.checks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.mock { background: var(--bg1); border: 1px solid var(--line2); border-radius: 18px; padding: 26px; display: grid; grid-template-columns: 110px 1fr; gap: 20px; align-items: center; box-shadow: 0 20px 60px rgba(0,0,0,.4); }
.mock-ring { width: 100px; height: 100px; border-radius: 50%; background: conic-gradient(var(--accent) 83%, rgba(255,255,255,.08) 0); display: grid; place-items: center; position: relative; }
.mock-ring::before { content: ""; position: absolute; inset: 10px; border-radius: 50%; background: var(--bg1); }
.mock-ring span { position: relative; font-size: 28px; font-weight: 900; }
.mock-bars { display: grid; gap: 10px; }
.mock-bars div { display: grid; grid-template-columns: 80px 1fr; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.mock-bars i { display: block; height: 8px; border-radius: 999px; background: rgba(255,255,255,.08); position: relative; overflow: hidden; }
.mock-bars i::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: var(--w); background: linear-gradient(90deg, var(--blue), var(--accent)); border-radius: 999px; }
.mock .muted { grid-column: 1 / -1; margin: 0; }

/* 요금 */
.plans .plan { position: relative; background: rgba(255,255,255,.04); border: 1px solid var(--line); border-radius: 18px; padding: 26px; display: flex; flex-direction: column; }
.plan.hot { border-color: rgba(0,166,178,.5); background: rgba(0,166,178,.06); }
.ribbon { position: absolute; top: 14px; right: 14px; font-size: 11px; background: var(--amber); color: #3a2a00; padding: 2px 10px; border-radius: 999px; font-weight: 700; }
.ribbon.soft { background: rgba(255,255,255,.12); color: var(--text); }
.plan h3 { margin: 0 0 4px; font-size: 18px; letter-spacing: .5px; } .price { font-size: 30px; font-weight: 800; margin-bottom: 4px; }
.plan-sub { color: var(--muted); font-size: 13px; margin: 0 0 14px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 20px; color: var(--muted); font-size: 14.5px; display: grid; gap: 6px; flex: 1; }
.plan ul li::before { content: "· "; color: var(--accent); }

/* FAQ */
details { border-top: 1px solid var(--line); padding: 14px 0; max-width: 820px; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; }
summary::after { content: "+"; color: var(--muted); } details[open] summary::after { content: "−"; }
details p { color: var(--muted); margin: 10px 0 0; } details a { color: var(--accent); }

/* CTA 띠 */
.cta-band { text-align: left; background: #0e1a2b url("assets/illus/banner-hands.svg") no-repeat right center / cover; border-top: 1px solid var(--line); min-height: 380px; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
.cta-band h2, .cta-band p { max-width: 420px; text-shadow: 0 2px 14px rgba(11,15,20,.8); }
.cta-band p { color: var(--muted); margin-bottom: 22px; }
@media (max-width: 700px) { .cta-band { background-position: 70% center; } }

/* 푸터 */
.site-footer { padding: 36px 6vw 40px; border-top: 1px solid var(--line); display: grid; gap: 14px; }
.site-footer nav { display: flex; gap: 20px; color: var(--muted); font-size: 14px; flex-wrap: wrap; }
.site-footer nav a:hover { color: var(--text); }

@media (max-width: 960px) {
  .hero, .split { grid-template-columns: 1fr; }
  .grid3, .levels { grid-template-columns: 1fr 1fr; }
  .shots { grid-template-columns: 1fr 1fr; } .shot.big { grid-column: span 2; grid-row: span 1; }
  .steps { grid-template-columns: 1fr; }
  .site-nav { display: none; }
}
@media (max-width: 600px) {
  .grid3, .levels { grid-template-columns: 1fr; }
  .section { padding: 48px 20px; } .hero { padding: 40px 20px 28px; }
  .header-cta .ghost { display: none; }
}