:root {
  --paper: #F4F5F2;
  --ink: #191C1A;
  --ink-soft: #4A4F4B;
  --celadon: #2F5D51;
  --celadon-deep: #234439;
  --hairline: #D9DCD6;
  --seal: #9E3B2C;
  --serif: 'MaruBuri', 'Noto Serif KR', serif;
  --serif-semi: 'MaruBuriSemiBold', 'MaruBuri', serif;
  --sans: 'IBM Plex Sans KR', 'Apple SD Gothic Neo', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--celadon); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--celadon-deep); }
:focus-visible { outline: 2px solid var(--celadon); outline-offset: 3px; }

em { font-style: normal; font-family: var(--serif-semi); }
b { font-weight: 600; }

/* ---------- header ---------- */

.site-header {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px 24px;
}

.wordmark { text-decoration: none; display: flex; align-items: baseline; gap: 10px; }
.wordmark-ko { font-family: var(--serif-semi); font-size: 20px; color: var(--ink); letter-spacing: 0.06em; }
.wordmark-en { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); letter-spacing: 0.22em; }

.site-header nav { display: flex; gap: 26px; }
.site-header nav a {
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.site-header nav a:hover { border-bottom-color: var(--ink); }

/* ---------- hero ---------- */

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 24px 120px;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 24px;
}

.hero-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding-top: 10px;
}

.spine {
  writing-mode: vertical-rl;
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: 0.42em;
  color: var(--ink-soft);
}

.seal {
  writing-mode: vertical-rl;
  background: var(--seal);
  color: var(--paper);
  font-family: var(--serif-semi);
  font-size: 12px;
  letter-spacing: 0.18em;
  padding: 12px 7px;
  border-radius: 2px;
}

.hero-eyebrow, .section-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--serif-semi);
  font-weight: normal;
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.36;
  letter-spacing: -0.005em;
  max-width: 17em;
}

.hero-lede {
  margin-top: 32px;
  max-width: 33em;
  color: var(--ink-soft);
}

.hero-meta {
  margin-top: 44px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
}

/* hero load sequence — the page's single orchestrated motion */
@media (prefers-reduced-motion: no-preference) {
  .hero-rail, .hero-eyebrow, .hero h1, .hero-lede, .hero-meta {
    opacity: 0;
    transform: translateY(10px);
    animation: rise 0.7s cubic-bezier(0.2, 0.6, 0.2, 1) forwards;
  }
  .hero-rail { transform: translateY(-14px); animation-delay: 0.5s; }
  .hero-eyebrow { animation-delay: 0.05s; }
  .hero h1 { animation-delay: 0.15s; }
  .hero-lede { animation-delay: 0.3s; }
  .hero-meta { animation-delay: 0.45s; }
  @keyframes rise { to { opacity: 1; transform: translateY(0); } }
}

/* ---------- sections ---------- */

section { scroll-margin-top: 24px; }

.apps, .principles, .contact {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 120px;
}

.apps h2, .principles h2, .contact h2 {
  font-family: var(--serif-semi);
  font-weight: normal;
  font-size: clamp(26px, 3.4vw, 36px);
  margin-bottom: 64px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hairline);
}

/* ---------- app rows ---------- */

.app-row {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
}
.app-row + .app-row { margin-top: 110px; }
.app-row--flip .app-shot { order: 2; }
.app-row--flip .app-info { order: 1; }

.app-shot { justify-self: center; }
.app-shot img {
  display: block;
  width: min(300px, 76vw);
  height: auto;
  border-radius: 34px;
  border: 1px solid var(--hairline);
  box-shadow: 0 24px 48px -28px rgba(25, 28, 26, 0.35);
}
.app-shot figcaption {
  margin-top: 14px;
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.app-icon { border-radius: 14px; margin-bottom: 22px; }

.app-kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--celadon);
}

.app-info h3 {
  font-family: var(--serif-semi);
  font-weight: normal;
  font-size: 30px;
  margin-top: 6px;
}

.app-tagline {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--ink-soft);
  margin-top: 2px;
}

.app-desc { margin-top: 18px; max-width: 30em; color: var(--ink-soft); }

.app-features { list-style: none; margin-top: 26px; max-width: 30em; }
.app-features li {
  padding: 12px 0;
  border-top: 1px solid var(--hairline);
  font-size: 15.5px;
  color: var(--ink-soft);
}
.app-features li:last-child { border-bottom: 1px solid var(--hairline); }
.app-features b {
  color: var(--ink);
  margin-right: 14px;
}

.store-link { display: inline-block; margin-top: 30px; transition: opacity 0.15s ease; }
.store-link:hover { opacity: 0.75; }
.store-link img { display: block; height: 44px; width: auto; }

/* ---------- principles ---------- */

.principles dl { max-width: 720px; }
.principle {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-top: 1px solid var(--hairline);
}
.principle:last-child { border-bottom: 1px solid var(--hairline); }
.principle dt {
  font-family: var(--serif-semi);
  font-size: 19px;
}
.principle dd { color: var(--ink-soft); }

/* ---------- contact ---------- */

.contact p { max-width: 30em; color: var(--ink-soft); }
.contact-mail {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 19px;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 44px 24px 64px;
}
.site-footer .biz {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
}
.site-footer .legal {
  max-width: 1080px;
  margin: 20px auto 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .app-row, .app-row--flip { grid-template-columns: 1fr; }
  .app-row--flip .app-shot { order: 1; }
  .app-row--flip .app-info { order: 2; }
  .app-shot { justify-self: start; }
  .app-row + .app-row { margin-top: 88px; }
  .principle { grid-template-columns: 1fr; gap: 6px; }
}

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; padding-bottom: 88px; }
  .hero-rail {
    flex-direction: row;
    align-items: center;
    order: 2;
    margin-top: 48px;
    padding-top: 0;
  }
  .spine { writing-mode: horizontal-tb; letter-spacing: 0.3em; font-size: 16px; }
  .seal { padding: 10px 6px; }
  .site-header { padding: 20px 24px; }
  .site-header nav { gap: 18px; }
  .site-header nav a { font-size: 14px; }
  .wordmark-ko { font-size: 18px; }
  .wordmark-en { display: none; }
  .hero-meta { font-size: 12px; }
  .apps, .principles, .contact { padding-bottom: 88px; }
}