/* =====================================================================
   Gravity Scroll — 우주 콘솔 테마 스타일시트
   팔레트는 앱 아이콘(마젠타→솔라 그라데이션, 딥 스페이스 네이비)에서 추출.
   ===================================================================== */

:root {
  /* --- 공간(space) --- */
  --void:        #06060e;
  --deep:        #0b0b18;
  --panel:       #10112a;
  --panel-2:     #15173a;
  --nebula:      #21223a;
  --line:        rgba(150, 160, 220, 0.14);
  --line-strong: rgba(160, 170, 230, 0.28);

  /* --- 발광 액센트 (로고 그라데이션) --- */
  --magenta:     #ff4fe0;
  --magenta-2:   #ee4995;
  --solar:       #ffce4a;
  --solar-2:     #ff9a3c;
  --ion:         #6ea8ff;   /* 앱 UI 블루 */
  --ion-2:       #4f7bff;

  /* --- 텍스트 --- */
  --star:        #f2f4ff;
  --dust:        #b9c0e0;
  --dim:         #7d84ab;

  /* --- 시그니처 그라데이션 --- */
  --grad-hex:    linear-gradient(135deg, var(--solar) 0%, var(--magenta) 55%, var(--ion) 120%);
  --grad-warm:   linear-gradient(120deg, var(--solar) 0%, var(--magenta) 100%);

  --radius:      18px;
  --radius-sm:   12px;
  --shadow:      0 24px 60px -28px rgba(0,0,0,0.85);
  --ring:        0 0 0 1px var(--line);

  --font-disp: "Space Grotesk", "Pretendard", system-ui, sans-serif;
  --font-body: "Pretendard", "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Space Mono", ui-monospace, monospace;

  --maxw: 1180px;
}

/* ---------- reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--void);
  color: var(--star);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 은은한 배경 네뷸라 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 600px at 82% -8%, rgba(255,79,224,0.18), transparent 60%),
    radial-gradient(760px 620px at 10% 6%,  rgba(110,168,255,0.16), transparent 62%),
    radial-gradient(1100px 900px at 50% 120%, rgba(255,154,60,0.10), transparent 60%),
    var(--void);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1,h2,h3,h4 { margin: 0; line-height: 1.12; letter-spacing: -0.02em; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--solar);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { position: relative; padding: 110px 0; }
.section--tight { padding: 72px 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--solar);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, var(--solar), transparent);
}

.h-sec {
  font-family: var(--font-disp);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 46px);
  margin: 18px 0 14px;
}
.lede { color: var(--dust); font-size: 18px; max-width: 620px; }

.grad-text {
  background: var(--grad-warm);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--grad-warm);
  color: #1a0a10;
  box-shadow: 0 12px 34px -12px rgba(255,79,224,0.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -12px rgba(255,79,224,0.7); }
.btn--ghost {
  background: rgba(255,255,255,0.04);
  border-color: var(--line-strong);
  color: var(--star);
}
.btn--ghost:hover { border-color: var(--ion); background: rgba(110,168,255,0.08); }
.btn--sm { padding: 10px 18px; font-size: 14px; }
.btn svg { width: 18px; height: 18px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(6,6,14,0.6);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  height: 68px; padding: 0 24px;
  display: flex; align-items: center; gap: 22px;
}
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--font-disp); font-weight: 700; font-size: 18px; }
.brand__logo { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 0 0 1px var(--line), 0 6px 18px -6px rgba(255,79,224,0.5); }
.brand__logo img { width: 100%; height: 100%; border-radius: 9px; }
.nav__links { display: flex; gap: 26px; margin-left: auto; }
.nav__links a { color: var(--dust); font-size: 14.5px; font-weight: 500; transition: color .15s; }
.nav__links a:hover { color: var(--star); }
.nav__cta { margin-left: 8px; }
.nav__burger { display: none; background: none; border: 0; color: var(--star); }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; }
#stars { position: absolute; inset: 0; z-index: 0; display: block; }
.hero__grid {
  position: relative; z-index: 2;
  max-width: var(--maxw); margin: 0 auto; width: 100%;
  padding: 40px 24px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center;
}

.hero__badge {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--dust);
  padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.03);
}
.hero__badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--solar); box-shadow: 0 0 10px var(--solar); }

.hero h1 {
  font-family: var(--font-disp);
  font-weight: 700;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  margin: 22px 0 0;
}
.hero__sub { color: var(--dust); font-size: 19px; margin-top: 20px; max-width: 500px; }
.hero__cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero__meta { display: flex; gap: 22px; margin-top: 26px; color: var(--dim); font-family: var(--font-mono); font-size: 12.5px; }
.hero__meta b { color: var(--star); font-weight: 600; }

/* 부드럽게 스크롤되는 텍스트 (시그니처) */
.ticker {
  height: 46px; overflow: hidden; position: relative;
  margin-top: 26px;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 35%, #000 65%, transparent);
          mask-image: linear-gradient(180deg, transparent, #000 35%, #000 65%, transparent);
}
.ticker__track { display: flex; flex-direction: column; animation: tickerUp 12s linear infinite; will-change: transform; }
.ticker__item {
  height: 46px; display: flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 15px; color: var(--dust); letter-spacing: 0.02em;
}
.ticker__item span { color: var(--solar); }
@keyframes tickerUp { from { transform: translateY(0); } to { transform: translateY(-50%); } }

/* ---------- hero 우측: 마우스 + 관성 스크롤 데모 ---------- */
.demo {
  position: relative;
  border-radius: 26px;
  padding: 22px;
  background:
    linear-gradient(160deg, rgba(255,79,224,0.10), rgba(110,168,255,0.06) 60%),
    rgba(10,11,26,0.72);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(6px);
}
.demo__hud {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 12px; color: var(--dim);
  padding-bottom: 14px; margin-bottom: 14px; border-bottom: 1px solid var(--line);
}
.demo__speed { color: var(--star); }
.demo__speed b { color: var(--solar); font-weight: 700; }
.demo__stage { position: relative; display: grid; grid-template-columns: 1fr 96px; gap: 16px; height: 320px; }

/* 모의 피드(관성 스크롤 대상) */
.feed {
  position: relative; overflow: hidden; border-radius: 14px;
  background: rgba(5,6,16,0.7); border: 1px solid var(--line);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 8%, #000 92%, transparent);
          mask-image: linear-gradient(180deg, transparent, #000 8%, #000 92%, transparent);
}
.feed__track { position: absolute; inset: 0; padding: 12px; will-change: transform; }
.feed__row {
  display: flex; gap: 10px; align-items: center;
  padding: 11px; margin-bottom: 10px;
  border-radius: 10px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line);
}
.feed__ic { width: 30px; height: 30px; border-radius: 8px; flex: 0 0 auto; background: var(--grad-warm); opacity: .85; }
.feed__ln { flex: 1; }
.feed__ln i { display: block; height: 8px; border-radius: 4px; background: rgba(255,255,255,0.14); }
.feed__ln i + i { margin-top: 7px; width: 60%; background: rgba(255,255,255,0.08); }

/* 스크롤바 트랙 + 마우스 */
.rail { position: relative; display: flex; flex-direction: column; align-items: center; }
.rail__bar { position: relative; width: 6px; flex: 1; border-radius: 6px; background: rgba(255,255,255,0.06); overflow: hidden; }
.rail__thumb { position: absolute; left: 0; width: 100%; border-radius: 6px; background: var(--grad-warm); box-shadow: 0 0 12px rgba(255,79,224,0.55); }

.mouse { margin-top: 14px; width: 74px; filter: drop-shadow(0 10px 20px rgba(0,0,0,.6)); }
.mouse__wheel { transform-box: fill-box; transform-origin: center; }

/* ---------- 신뢰 스트립 ---------- */
.trust { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(10,11,26,0.5); }
.trust__inner { display: flex; flex-wrap: wrap; gap: 14px 40px; align-items: center; justify-content: center; padding: 22px 24px; }
.trust__item { display: flex; align-items: center; gap: 10px; color: var(--dust); font-size: 14px; font-family: var(--font-mono); }
.trust__item svg { width: 18px; height: 18px; color: var(--solar); }

/* ---------- 특징 카드 ---------- */
.grid-feat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 46px; }
.card {
  position: relative; padding: 28px 24px; border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(21,23,58,0.6), rgba(11,12,26,0.6));
  border: 1px solid var(--line);
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.card__ic {
  width: 46px; height: 46px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 16px;
  background: rgba(255,79,224,0.10); border: 1px solid var(--line-strong); color: var(--solar);
}
.card__ic svg { width: 22px; height: 22px; }
.card h3 { font-size: 19px; font-family: var(--font-disp); font-weight: 600; }
.card p { color: var(--dust); font-size: 14.5px; margin-top: 9px; }
.card--wide { grid-column: span 3; display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; }

/* ---------- 설정 항목 설명 ---------- */
.settings { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 44px; }
.setgroup {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(11,12,26,0.55); overflow: hidden;
}
.setgroup__head {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 22px; border-bottom: 1px solid var(--line);
  font-family: var(--font-disp); font-weight: 600; font-size: 16px;
}
.setgroup__head .tag { margin-left: auto; font-family: var(--font-mono); font-size: 11px; color: var(--dim); border: 1px solid var(--line); padding: 3px 9px; border-radius: 999px; }
.setrow { padding: 16px 22px; border-bottom: 1px solid var(--line); }
.setrow:last-child { border-bottom: 0; }
.setrow__top { display: flex; align-items: baseline; gap: 10px; }
.setrow__name { font-weight: 600; color: var(--star); }
.setrow__range { margin-left: auto; font-family: var(--font-mono); font-size: 11.5px; color: var(--solar); }
.setrow p { color: var(--dust); font-size: 13.5px; margin-top: 6px; }

/* ---------- 사용 방법 (스텝) ---------- */
.steps { counter-reset: step; margin-top: 44px; display: grid; gap: 16px; }
.step {
  display: grid; grid-template-columns: 60px 1fr; gap: 20px; align-items: start;
  padding: 22px 24px; border-radius: var(--radius);
  border: 1px solid var(--line); background: rgba(11,12,26,0.5);
}
.step__num {
  counter-increment: step;
  font-family: var(--font-disp); font-weight: 700; font-size: 30px;
  background: var(--grad-warm); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.step__num::before { content: counter(step, decimal-leading-zero); }
.step h3 { font-size: 18px; font-family: var(--font-disp); font-weight: 600; }
.step p { color: var(--dust); font-size: 14.5px; margin-top: 8px; }

/* ---------- 프리셋 칩 ---------- */
.presets { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.chip {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .04em;
  padding: 8px 15px; border-radius: 999px; color: var(--dust);
  border: 1px solid var(--line-strong); background: rgba(255,255,255,0.03);
}
.chip.hot { color: #1a0a10; background: var(--grad-warm); border-color: transparent; font-weight: 600; }

/* ---------- 요금제 ---------- */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 46px; align-items: stretch; }
.plan {
  display: flex; flex-direction: column;
  padding: 30px 26px; border-radius: var(--radius);
  border: 1px solid var(--line); background: rgba(11,12,26,0.55);
}
.plan--feature { border-color: transparent; background: linear-gradient(180deg, rgba(255,79,224,0.12), rgba(110,168,255,0.06)); box-shadow: 0 0 0 1px var(--magenta-2), 0 30px 70px -40px rgba(255,79,224,0.6); position: relative; }
.plan__flag { position: absolute; top: -12px; left: 26px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; padding: 5px 12px; border-radius: 999px; background: var(--grad-warm); color: #1a0a10; font-weight: 700; }
.plan__name { font-family: var(--font-disp); font-weight: 600; font-size: 20px; }
.plan__price { margin: 14px 0 4px; font-family: var(--font-disp); }
.plan__price b { font-size: 40px; font-weight: 700; }
.plan__price span { color: var(--dim); font-size: 14px; }
.plan__desc { color: var(--dust); font-size: 14px; min-height: 40px; }
.plan ul { list-style: none; padding: 0; margin: 20px 0 24px; display: grid; gap: 11px; }
.plan li { display: flex; gap: 10px; font-size: 14px; color: var(--dust); }
.plan li svg { width: 17px; height: 17px; color: var(--solar); flex: 0 0 auto; margin-top: 3px; }
.plan .btn { margin-top: auto; justify-content: center; }
.pay-note { margin-top: 24px; text-align: center; color: var(--dim); font-size: 13px; font-family: var(--font-mono); }

/* ---------- 다운로드 ---------- */
.dl {
  border-radius: var(--radius); border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, rgba(21,23,58,0.7), rgba(11,12,26,0.7));
  padding: 34px; margin-top: 44px;
  display: grid; grid-template-columns: 1fr auto; gap: 26px; align-items: center;
}
.dl__ver { font-family: var(--font-mono); color: var(--solar); font-size: 13px; letter-spacing: .1em; }
.dl h3 { font-family: var(--font-disp); font-size: 26px; margin: 8px 0 6px; }
.dl__meta { color: var(--dust); font-size: 14px; font-family: var(--font-mono); }
.dl__right { text-align: right; }
.dl__hint { color: var(--dim); font-size: 12.5px; margin-top: 10px; font-family: var(--font-mono); }

.releases { margin-top: 30px; display: grid; gap: 12px; }
.rel {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: rgba(11,12,26,0.5); overflow: hidden;
}
.rel__sum {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: 14px; padding: 16px 20px;
}
.rel__sum::-webkit-details-marker { display: none; }
.rel__v { font-family: var(--font-mono); font-weight: 700; color: var(--star); }
.rel__badge { font-family: var(--font-mono); font-size: 10.5px; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--dust); }
.rel__badge.beta { color: var(--solar); border-color: rgba(255,206,74,0.4); }
.rel__hl { color: var(--dust); font-size: 13.5px; flex: 1; }
.rel__date { font-family: var(--font-mono); font-size: 12px; color: var(--dim); }
.rel__chev { color: var(--dim); transition: transform .2s; }
.rel[open] .rel__chev { transform: rotate(180deg); }
.rel__body { padding: 4px 20px 20px 20px; border-top: 1px solid var(--line); }
.rel__body ul { margin: 14px 0 16px; padding-left: 20px; color: var(--dust); font-size: 14px; display: grid; gap: 8px; }
.rel__dl { display: flex; gap: 14px; align-items: center; color: var(--dim); font-family: var(--font-mono); font-size: 12px; flex-wrap: wrap; }

/* ---------- FAQ ---------- */
.faq { margin-top: 40px; display: grid; gap: 12px; }
.qa { border: 1px solid var(--line); border-radius: var(--radius-sm); background: rgba(11,12,26,0.5); }
.qa summary { list-style: none; cursor: pointer; padding: 20px 22px; display: flex; align-items: center; gap: 14px; font-weight: 600; color: var(--star); }
.qa summary::-webkit-details-marker { display: none; }
.qa summary .q { flex: 1; font-size: 15.5px; }
.qa summary .plus { color: var(--solar); font-family: var(--font-mono); transition: transform .2s; }
.qa[open] summary .plus { transform: rotate(45deg); }
.qa p { padding: 0 22px 22px 22px; color: var(--dust); font-size: 14.5px; }

/* ---------- CTA 배너 ---------- */
.cta-band {
  position: relative; overflow: hidden;
  border-radius: 24px; padding: 56px 40px; text-align: center;
  background: linear-gradient(140deg, rgba(255,79,224,0.16), rgba(110,168,255,0.10));
  border: 1px solid var(--line-strong);
}
.cta-band h2 { font-family: var(--font-disp); font-size: clamp(26px, 4vw, 40px); }
.cta-band p { color: var(--dust); margin: 14px auto 26px; max-width: 520px; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); padding: 46px 0 60px; margin-top: 90px; }
.foot__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.foot h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--dim); margin-bottom: 14px; }
.foot a { display: block; color: var(--dust); font-size: 14px; padding: 5px 0; }
.foot a:hover { color: var(--star); }
.foot__bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--dim); font-size: 13px; font-family: var(--font-mono); }
.foot__brand p { color: var(--dust); font-size: 14px; margin-top: 12px; max-width: 260px; }

/* ---------- reveal 애니메이션 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .ticker__track, .mouse__wheel { animation: none !important; }
}

/* =====================================================================
   반응형
   ===================================================================== */
@media (max-width: 940px) {
  .hero__grid { grid-template-columns: 1fr; }
  .demo { max-width: 460px; }
  .grid-feat { grid-template-columns: 1fr 1fr; }
  .card--wide { grid-column: span 2; grid-template-columns: 1fr; }
  .settings { grid-template-columns: 1fr; }
  .pricing { grid-template-columns: 1fr; max-width: 460px; }
  .foot__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 76px 0; }
  .nav__links { display: none; }
  .nav__burger { display: inline-flex; margin-left: auto; }
  .nav__cta { display: none; }
  .grid-feat { grid-template-columns: 1fr; }
  .card--wide { grid-column: span 1; }
  .dl { grid-template-columns: 1fr; }
  .dl__right { text-align: left; }
  .demo__stage { height: 260px; }
  .hero__meta { flex-wrap: wrap; gap: 12px 20px; }
}

/* 모바일 슬라이드 메뉴 */
.mobile-menu { display: none; position: fixed; inset: 68px 0 0 0; z-index: 49; background: rgba(6,6,14,0.97); padding: 24px; }
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 16px 4px; font-size: 18px; border-bottom: 1px solid var(--line); color: var(--star); }