:root {
  --blue: #2f6cf6;
  --blue-d: #1f4fd6;
  --ink: #111827;
  --ink-2: #4b5563;
  --ink-3: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-2: #f5f7fb;
  --card: #ffffff;
  --radius: 18px;
  --shadow: 0 30px 60px -20px rgba(17, 40, 100, .35), 0 0 0 1px rgba(17, 24, 39, .06);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f3f4f6;
    --ink-2: #c4c9d4;
    --ink-3: #9aa1ad;
    --line: #2a2f3a;
    --bg: #0d1017;
    --bg-2: #141924;
    --card: #181e2a;
    --shadow: 0 30px 60px -20px rgba(0, 0, 0, .7), 0 0 0 1px rgba(255, 255, 255, .08);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.6;
  word-break: keep-all; overflow-wrap: break-word; -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }
.br-m { display: none; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue); color: #fff; font-weight: 600; font-size: 16px;
  padding: 14px 24px; border-radius: 999px; transition: background .2s, transform .2s;
}
.btn:hover { background: var(--blue-d); transform: translateY(-1px); }
.btn svg { width: 18px; height: 18px; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-ghost { background: transparent; color: var(--blue); box-shadow: inset 0 0 0 1.5px currentColor; }
.btn-ghost:hover { background: rgba(47, 108, 246, .08); }
.btn-light { background: #fff; color: var(--blue-d); }
.btn-light:hover { background: #eef3ff; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px);
  transition: box-shadow .2s;
}
.nav.scrolled { box-shadow: 0 1px 0 var(--line); }
.nav-in { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand img { border-radius: 7px; }
.links { display: flex; gap: 28px; margin-left: auto; font-size: 15px; color: var(--ink-2); }
.links a:hover { color: var(--ink); }
.menu { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; position: relative; }
.menu span { position: absolute; left: 10px; right: 10px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s, top .25s; }
.menu span:first-child { top: 15px; }
.menu span:last-child { top: 23px; }
.menu-open .menu span:first-child { top: 19px; transform: rotate(45deg); }
.menu-open .menu span:last-child { top: 19px; transform: rotate(-45deg); }

/* Hero */
.hero {
  padding: 88px 0 0; text-align: center; overflow: hidden;
  background:
    radial-gradient(1200px 600px at 50% 110%, rgba(47, 108, 246, .28), transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
}
.eyebrow { color: var(--blue); font-weight: 700; font-size: 15px; letter-spacing: .02em; margin-bottom: 14px; }
h1 { font-size: clamp(34px, 6vw, 64px); line-height: 1.18; letter-spacing: -.03em; font-weight: 800; }
h2 { font-size: clamp(28px, 4.2vw, 46px); line-height: 1.22; letter-spacing: -.025em; font-weight: 800; }
h3 { font-size: clamp(24px, 2.8vw, 34px); line-height: 1.28; letter-spacing: -.02em; font-weight: 750; margin: 12px 0 14px; }
.lead { font-size: clamp(16px, 1.6vw, 20px); color: var(--ink-2); margin-top: 20px; }
.hero .lead { max-width: 720px; margin-left: auto; margin-right: auto; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.fine { font-size: 13px; color: var(--ink-3); margin-top: 14px; }

.window { border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); background: #fff; }
.window img { width: 100%; cursor: zoom-in; }
.hero-shot { margin: 56px auto 0; max-width: 1100px; border-bottom-left-radius: 0; border-bottom-right-radius: 0;
  -webkit-mask-image: linear-gradient(#000 80%, transparent); mask-image: linear-gradient(#000 80%, transparent); }

/* Pills */
.pills { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; padding-top: 40px; padding-bottom: 24px; }
.pills span { font-size: 14px; font-weight: 600; color: var(--ink-2); background: var(--bg-2); border: 1px solid var(--line); padding: 8px 16px; border-radius: 999px; }

/* Features */
.features { padding: 80px 0 40px; }
.section-head { text-align: center; margin-bottom: 64px; }
.section-head.left { text-align: left; margin-bottom: 0; }
.feature {
  display: grid; grid-template-columns: 5fr 7fr; gap: 64px; align-items: center; margin-bottom: 120px;
  opacity: 0; transform: translateY(24px); transition: opacity .7s, transform .7s;
}
.feature.in { opacity: 1; transform: none; }
.feature.rev .f-copy { order: 2; }
.tag { display: inline-block; font-size: 13px; font-weight: 700; color: var(--blue); background: rgba(47, 108, 246, .1); padding: 4px 12px; border-radius: 999px; }
.f-copy p { color: var(--ink-2); font-size: 17px; }
.f-copy ul { list-style: none; margin-top: 18px; display: grid; gap: 8px; }
.f-copy li { position: relative; padding-left: 26px; font-size: 15px; color: var(--ink-2); }
.f-copy li::before { content: ""; position: absolute; left: 0; top: 5px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.2 2.2 4.8-4.8' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat; }

/* All features grid */
.all { background: var(--bg-2); padding: 100px 0; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px;
  opacity: 0; transform: translateY(16px); transition: opacity .6s, transform .6s; }
.card.in { opacity: 1; transform: none; }
.card h4 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--ink-2); font-size: 15px; }

/* Privacy */
.privacy { padding: 120px 0; }
.privacy-in { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.trust { list-style: none; display: grid; gap: 14px; }
.trust li { display: grid; gap: 4px; padding: 22px 24px; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--line);
  opacity: 0; transform: translateX(16px); transition: opacity .6s, transform .6s; }
.trust li.in { opacity: 1; transform: none; }
.trust b { font-size: 17px; }
.trust span { color: var(--ink-2); font-size: 15px; }

/* FAQ */
.faq { padding: 40px 0 120px; }
.faq .section-head { margin-bottom: 40px; }
details { border-bottom: 1px solid var(--line); }
summary { list-style: none; cursor: pointer; padding: 22px 40px 22px 0; font-size: 18px; font-weight: 650; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%); font-size: 26px; font-weight: 300; color: var(--ink-3); transition: transform .2s; }
details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
details p { color: var(--ink-2); padding: 0 0 22px; }

/* Download */
.download { background: linear-gradient(135deg, #3b82f6 0%, #2f6cf6 45%, #1d3fbf 100%); color: #fff; text-align: center; padding: 110px 0; }
.dl-in img { margin: 0 auto 24px; filter: drop-shadow(0 16px 30px rgba(0, 0, 0, .3)); }
.download p { opacity: .9; margin: 14px 0 30px; font-size: 18px; }
.download .fine { color: #fff; opacity: .7; margin-top: 16px; font-size: 13px; }

/* Footer */
.footer { padding: 40px 0 48px; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-3); }
.foot-in { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; }
.foot-in .brand { font-size: 15px; color: var(--ink); }
.foot-in .brand img { border-radius: 5px; }
.foot-in nav { display: flex; gap: 20px; }
.foot-in nav a:hover { color: var(--ink); }
.foot-in p { flex-basis: 100%; }

/* Lightbox */
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(0, 0, 0, .85); display: grid; place-items: center; padding: 16px; cursor: zoom-out; }
.lightbox[hidden] { display: none; }
.lightbox img { max-height: 92vh; border-radius: 10px; }
.lightbox button { position: absolute; top: 16px; right: 16px; width: 44px; height: 44px; border-radius: 50%; border: 0; background: rgba(255, 255, 255, .15); color: #fff; font-size: 18px; cursor: pointer; }

/* Tablet */
@media (max-width: 980px) {
  .feature, .feature.rev { grid-template-columns: 1fr; gap: 32px; margin-bottom: 96px; }
  .feature.rev .f-copy { order: 0; }
  .f-copy { max-width: 640px; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .privacy-in { grid-template-columns: 1fr; gap: 40px; }
}

/* Mobile */
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .br-d { display: none; }
  .br-m { display: inline; }
  .menu { display: block; margin-left: auto; }
  .nav .btn-sm { display: none; }
  .links {
    position: fixed; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0; margin: 0;
    background: var(--bg); border-bottom: 1px solid var(--line); padding: 8px 16px 16px;
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
  }
  .links a { padding: 14px 4px; font-size: 17px; color: var(--ink); border-bottom: 1px solid var(--line); }
  .links a:last-child { border-bottom: 0; }
  .menu-open .links { opacity: 1; transform: none; pointer-events: auto; }
  .hero { padding-top: 56px; }
  .cta .btn { width: 100%; justify-content: center; }
  .hero-shot { margin-top: 40px; border-radius: 8px 8px 0 0; }
  .features { padding-top: 64px; }
  .section-head { margin-bottom: 44px; }
  .feature, .feature.rev { margin-bottom: 72px; gap: 24px; }
  .window { border-radius: 8px; }
  .f-copy p { font-size: 16px; }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 22px; }
  .all, .privacy { padding: 72px 0; }
  .faq { padding-bottom: 80px; }
  summary { font-size: 16px; }
  .download { padding: 80px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .feature, .card, .trust li { opacity: 1; transform: none; transition: none; }
}