:root {
  --font-geist-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --font-geist-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --paper: #f7f5ef;
  --paper-deep: #ebe7dc;
  --ink: #0d2440;
  --muted: #607087;
  --blue: #1778f2;
  --blue-dark: #0b5fca;
  --line: rgba(13, 36, 64, 0.14);
  --white: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-geist-sans), -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { display: block; max-width: 100%; }

.section-shell {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(13, 36, 64, 0.08);
  background: rgba(247, 245, 239, 0.88);
  backdrop-filter: blur(18px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 18px;
  font-weight: 760;
  letter-spacing: -0.04em;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  box-shadow: 0 5px 16px rgba(15, 85, 160, 0.18);
}

nav { display: flex; gap: 30px; }
nav a { color: #3c4f65; font-size: 14px; font-weight: 620; }
nav a:hover, nav a:focus-visible { color: var(--blue); }

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 72px;
  padding-block: 88px 108px;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--blue);
  font-family: var(--font-geist-mono), monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 7.2vw, 98px);
  line-height: 0.98;
  letter-spacing: -0.075em;
  font-weight: 780;
}

.hero-description {
  max-width: 590px;
  margin: 32px 0 0;
  color: #4e6075;
  font-size: 18px;
  line-height: 1.75;
  word-break: keep-all;
}

.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 40px; }

.primary-button, .light-button {
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 0 24px;
  border-radius: 12px;
  background: var(--blue);
  color: white;
  font-size: 15px;
  font-weight: 720;
  box-shadow: 0 15px 32px rgba(23, 120, 242, 0.22);
  transition: transform 180ms ease, background 180ms ease;
}

.primary-button:hover, .primary-button:focus-visible { transform: translateY(-2px); background: var(--blue-dark); }

.text-link { display: inline-flex; gap: 14px; color: var(--ink); font-size: 14px; font-weight: 670; }
.text-link:hover, .text-link:focus-visible { color: var(--blue); }

.store-proof {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-top: 32px;
  color: #68788c;
  font-family: var(--font-geist-mono), monospace;
  font-size: 11px;
}

.proof-divider { width: 1px; height: 11px; background: var(--line); }

.hero-visual {
  position: relative;
  min-height: 510px;
  display: grid;
  place-items: center;
}

.hero-visual::before {
  content: "";
  position: absolute;
  width: 390px;
  height: 390px;
  border-radius: 50%;
  background: rgba(94, 180, 255, 0.2);
  filter: blur(45px);
}

.hero-visual img {
  position: relative;
  z-index: 3;
  width: min(330px, 76%);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 27%;
  box-shadow: 0 32px 68px rgba(31, 79, 130, 0.22), 0 4px 14px rgba(31, 79, 130, 0.14);
  transform: rotate(2.5deg);
}

.paper {
  position: absolute;
  width: 345px;
  height: 420px;
  border: 1px solid rgba(13, 36, 64, 0.1);
  border-radius: 8px;
  background: #fffefa;
  box-shadow: 0 24px 55px rgba(63, 78, 92, 0.08);
}

.paper-back { transform: translate(62px, -24px) rotate(12deg); }
.paper-front { transform: translate(-45px, 15px) rotate(-9deg); }

.reading-lines { display: grid; gap: 15px; padding: 50px 38px; opacity: 0.2; }
.reading-lines span { height: 2px; background: var(--ink); border-radius: 10px; }
.reading-lines span:nth-child(2) { width: 78%; }
.reading-lines span:nth-child(4) { width: 58%; }

.visual-caption {
  position: absolute;
  right: 6px;
  bottom: 10px;
  margin: 0;
  color: #8090a3;
  font-family: var(--font-geist-mono), monospace;
  font-size: 10px;
  letter-spacing: 0.17em;
  writing-mode: vertical-rl;
}

.feature-section { padding-block: 120px; background: #fff; }

.section-heading { max-width: 700px; }
.section-heading h2, .formats-copy h2, .closing-inner h2, .content-page h1 {
  margin: 0;
  font-size: clamp(38px, 4.5vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.06em;
}

.section-heading > p:last-child, .formats-copy > p:last-child {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 64px;
  border-top: 1px solid var(--line);
}

.feature-card { min-height: 290px; padding: 30px 32px 34px 0; border-right: 1px solid var(--line); }
.feature-card + .feature-card { padding-left: 32px; }
.feature-card:last-child { border-right: 0; }
.feature-number { color: var(--blue); font-family: var(--font-geist-mono), monospace; font-size: 12px; }
.feature-card h3 { margin: 72px 0 16px; font-size: 23px; letter-spacing: -0.045em; }
.feature-card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; word-break: keep-all; }

.formats-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 100px;
  padding-block: 130px;
  align-items: start;
}

.format-list { border-top: 1px solid var(--ink); }
.format-row { display: flex; justify-content: space-between; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.format-row span { color: var(--blue); font-family: var(--font-geist-mono), monospace; font-size: 11px; letter-spacing: 0.12em; }
.format-row strong { text-align: right; font-size: 18px; letter-spacing: -0.03em; }

.closing-section { background: var(--ink); color: white; }
.closing-inner { min-height: 400px; display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.closing-inner .light { color: #86c3ff; }
.closing-inner h2 { font-size: clamp(42px, 5vw, 70px); }
.light-button { background: white; color: var(--ink); box-shadow: none; white-space: nowrap; }
.light-button:hover, .light-button:focus-visible { transform: translateY(-2px); background: #dcecff; }

.site-footer { background: #081b30; color: #c9d6e4; border-top: 1px solid rgba(255,255,255,0.08); }
.footer-inner { min-height: 230px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 30px 70px; }
.footer-brand { color: white; }
.footer-inner p { color: #8295a9; }
.footer-links { display: flex; gap: 28px; font-size: 13px; }
.footer-links a:hover, .footer-links a:focus-visible { color: white; }
.copyright { grid-column: 1 / -1; margin: 0 0 30px; font-family: var(--font-geist-mono), monospace; font-size: 10px; letter-spacing: 0.08em; }

.content-page { width: min(820px, calc(100% - 48px)); margin: 0 auto; padding: 100px 0 140px; }
.content-page .page-intro { margin: 22px 0 70px; color: var(--muted); font-size: 18px; line-height: 1.75; }
.content-section { padding: 34px 0; border-top: 1px solid var(--line); }
.content-section h2 { margin: 0 0 18px; font-size: 23px; letter-spacing: -0.04em; }
.content-section h3 { margin: 25px 0 8px; font-size: 17px; }
.content-section p, .content-section li { color: #4d6075; font-size: 15px; line-height: 1.85; }
.content-section ul { padding-left: 20px; }
.content-section a { color: var(--blue-dark); text-decoration: underline; text-underline-offset: 4px; }
.policy-table { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 14px; }
.policy-table th, .policy-table td { padding: 16px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.65; }
.policy-table th { color: var(--ink); }
.policy-table td { color: #4d6075; }
.support-card { margin-top: 52px; padding: 36px; border-radius: 18px; background: white; box-shadow: 0 18px 40px rgba(40, 66, 94, 0.08); }
.support-card h2 { margin-top: 0; }
.support-email { display: inline-flex; margin-top: 10px; color: var(--blue-dark); font-size: 20px; font-weight: 720; }
.support-email:hover, .support-email:focus-visible { text-decoration: underline; text-underline-offset: 5px; }
.faq-list { margin-top: 70px; }
.faq-item { padding: 28px 0; border-top: 1px solid var(--line); }
.faq-item h2 { font-size: 19px; }
.faq-item p { color: var(--muted); line-height: 1.75; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 35px; padding-top: 68px; }
  .hero-copy { max-width: 680px; }
  .hero-visual { min-height: 470px; }
  .formats-section { grid-template-columns: 1fr; gap: 54px; }
  .closing-inner { align-items: flex-start; flex-direction: column; justify-content: center; }
}

@media (max-width: 680px) {
  .section-shell, .content-page { width: min(100% - 32px, 1180px); }
  .header-inner { min-height: 66px; }
  nav { gap: 16px; }
  nav a:first-child { display: none; }
  .hero { min-height: auto; padding-block: 62px 78px; }
  .hero h1 { font-size: clamp(52px, 15vw, 72px); }
  .hero-description { font-size: 16px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 22px; }
  .store-proof { flex-wrap: wrap; }
  .hero-visual { min-height: 390px; }
  .hero-visual img { width: 245px; }
  .paper { width: 250px; height: 320px; }
  .paper-back { transform: translate(43px, -18px) rotate(12deg); }
  .paper-front { transform: translate(-30px, 12px) rotate(-9deg); }
  .visual-caption { display: none; }
  .feature-section, .formats-section { padding-block: 88px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card, .feature-card + .feature-card { min-height: 230px; padding: 28px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-card h3 { margin-top: 50px; }
  .closing-inner { min-height: 390px; }
  .closing-inner h2 { font-size: 44px; }
  .light-button { white-space: normal; }
  .footer-inner { padding-block: 60px 35px; grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: 16px; }
  .copyright { grid-column: auto; }
  .content-page { padding: 72px 0 100px; }
  .policy-table { display: block; overflow-x: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}