:root {
  color-scheme: light dark;
  --bg: #f5f7f6;
  --surface: #fbfdfc;
  --surface-soft: #e9f1ed;
  --ink: #17201d;
  --muted: #53625d;
  --line: #cdd8d3;
  --accent: #176f54;
  --accent-strong: #115740;
  --accent-ink: #f7fbf9;
  --focus: #0b6fce;
  --radius: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Pretendard Variable", "SUIT Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
  transform: translateY(-150%);
}

.skip-link:focus {
  color: var(--bg);
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 2;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}

.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.site-nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 24px;
  white-space: nowrap;
}

.site-nav a,
.site-footer a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

.hero {
  min-height: calc(100dvh - 73px);
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  align-items: center;
  gap: clamp(40px, 7vw, 96px);
  padding-block: clamp(48px, 8vh, 88px);
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  letter-spacing: -0.035em;
  line-height: 1.16;
}

h1 {
  max-width: 10ch;
  margin-bottom: 24px;
  font-size: clamp(3rem, 5.4vw, 5rem);
  font-weight: 800;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(2rem, 3.6vw, 3.2rem);
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(1.3rem, 2vw, 1.65rem);
}

.hero-summary,
.section-heading p,
.trust-panel p,
.page-intro,
.app-card p {
  color: var(--muted);
}

.hero-summary {
  max-width: 33rem;
  margin-bottom: 34px;
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
}

.button-row,
.text-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 750;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  color: inherit;
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(1px);
}

.button-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.button-primary:hover {
  background: var(--accent-strong);
  color: var(--accent-ink);
}

.button-secondary {
  border-color: var(--line);
  background: var(--surface);
}

.hero-media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.section {
  padding-block: clamp(80px, 11vw, 144px);
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 660px;
  margin-bottom: 52px;
}

.section-heading p {
  margin-bottom: 0;
  font-size: 1.06rem;
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  gap: 20px;
}

.app-card {
  min-height: 470px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.app-card-featured {
  background: var(--surface-soft);
}

.app-icon {
  width: 112px;
  height: 112px;
  margin-bottom: 48px;
  border-radius: var(--radius);
}

.app-card-copy {
  max-width: 35rem;
}

.app-card p {
  margin-bottom: 24px;
}

.text-links a {
  color: var(--accent);
  font-weight: 700;
}

.card-action {
  margin-top: auto;
}

.trust-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(240px, 0.7fr);
  align-items: end;
  gap: 48px;
  padding: clamp(32px, 5vw, 64px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
}

.trust-panel h2 {
  max-width: 14ch;
}

.trust-panel p {
  margin-bottom: 0;
  color: color-mix(in srgb, var(--bg) 72%, transparent);
}

.trust-links {
  display: grid;
  gap: 14px;
}

.trust-links a {
  color: var(--bg);
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-shell {
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer-shell p {
  display: grid;
  margin-bottom: 0;
}

.footer-shell span {
  color: var(--muted);
  font-size: 0.86rem;
}

.page-hero {
  padding-block: clamp(64px, 9vw, 112px);
}

.page-hero-inner {
  max-width: 800px;
}

.page-hero h1 {
  max-width: 14ch;
  font-size: clamp(2.8rem, 5vw, 4.6rem);
}

.page-intro {
  max-width: 60ch;
  margin-bottom: 0;
  font-size: 1.12rem;
}

.app-hero {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  align-items: center;
  gap: 36px;
}

.app-hero .app-icon {
  width: 150px;
  height: 150px;
  margin: 0;
}

.app-hero h1 {
  max-width: 16ch;
  margin-bottom: 16px;
  font-size: clamp(2.5rem, 4.8vw, 4.3rem);
}

.app-hero .button-row {
  margin-top: 28px;
}

.content-shell {
  display: grid;
  grid-template-columns: minmax(190px, 0.34fr) minmax(0, 0.66fr);
  gap: clamp(40px, 8vw, 110px);
  padding-block: clamp(72px, 10vw, 120px);
  border-top: 1px solid var(--line);
}

.content-nav {
  align-self: start;
  position: sticky;
  top: 28px;
  display: grid;
  gap: 10px;
}

.content-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

.prose {
  min-width: 0;
}

.prose section {
  margin-bottom: 64px;
  scroll-margin-top: 30px;
}

.prose section:last-child {
  margin-bottom: 0;
}

.prose h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
}

.prose h3 {
  margin-top: 30px;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.prose p,
.prose li {
  max-width: 70ch;
  color: var(--muted);
}

.prose ul {
  max-width: 70ch;
  margin: 16px 0 0;
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: 10px;
}

.notice {
  margin-block: 24px;
  padding: 20px 22px;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--ink);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.info-item {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.info-item strong,
.info-item span {
  display: block;
}

.info-item span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.support-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 20px;
}

.support-card {
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.support-card p {
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

summary {
  padding: 20px 22px;
  cursor: pointer;
  font-weight: 750;
}

details p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--muted);
}

.policy-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.policy-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
}

.policy-card:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.policy-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.error-page {
  min-height: calc(100dvh - 213px);
  display: grid;
  place-items: center;
  padding-block: 80px;
}

.error-content {
  max-width: 620px;
  text-align: center;
}

.error-content h1 {
  max-width: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1513;
    --surface: #17201d;
    --surface-soft: #1d2c27;
    --ink: #eef4f1;
    --muted: #aab9b3;
    --line: #35443f;
    --accent: #62d0a4;
    --accent-strong: #7cdfb7;
    --accent-ink: #102019;
    --focus: #79b9ff;
  }

  .hero-media img {
    opacity: 0.88;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .nav-shell {
    min-height: 64px;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a {
    font-size: 0.84rem;
  }

  .hero,
  .app-grid,
  .trust-panel,
  .content-shell,
  .support-grid,
  .policy-list {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 44px;
    padding-block: 56px 72px;
  }

  h1 {
    font-size: clamp(2.7rem, 14vw, 4.2rem);
  }

  .hero-media {
    order: -1;
  }

  .app-card {
    min-height: 430px;
  }

  .trust-panel {
    align-items: start;
  }

  .footer-shell {
    min-height: 180px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }

  .app-hero {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
  }

  .app-hero .app-icon {
    width: 92px;
    height: 92px;
  }

  .app-hero h1 {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .content-nav {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-bottom: 28px;
    border-bottom: 1px solid var(--line);
  }

  .info-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 440px) {
  .wordmark {
    font-size: 0.82rem;
  }

  .site-nav a:nth-child(2) {
    display: none;
  }

  .button-row,
  .button {
    width: 100%;
  }

  .site-footer nav {
    flex-wrap: wrap;
    gap: 12px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}