:root {
  --primary-50: #eef4ff;
  --primary-500: #356df3;
  --primary-600: #245be7;
  --primary-700: #1748c7;
  --neutral-50: #f7f8fa;
  --neutral-100: #eef0f3;
  --neutral-300: #cfd4dc;
  --neutral-600: #586174;
  --neutral-900: #10131a;
  --white: #ffffff;
  --dark: #111722;
  --line: #e3e6eb;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 24px 64px rgba(16, 19, 26, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--white);
  color: var(--neutral-900);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

button, input, select, textarea { font: inherit; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(227, 230, 235, 0.86);
  backdrop-filter: blur(16px);
}

.header-inner {
  width: min(100%, 1360px);
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand img { height: 24px; display: block; }

.preview-badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  border: 1px solid var(--neutral-300);
  border-radius: 999px;
  color: var(--neutral-600);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-left: auto;
  margin-right: 40px;
}

.main-nav a,
.text-link {
  color: #373e4d;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.main-nav a:hover,
.text-link:hover { color: var(--primary-600); }

.header-actions { display: flex; align-items: center; gap: 16px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: var(--primary-600);
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  background: var(--primary-700);
  box-shadow: 0 8px 24px rgba(36, 91, 231, 0.22);
  transform: translateY(-1px);
}

.button-small { min-height: 40px; padding: 0 16px; font-size: 14px; }

.button-light { background: var(--white); color: var(--dark); }
.button-light:hover { background: var(--neutral-100); box-shadow: none; }

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0 12px;
  border: 0;
  border-radius: 10px;
  background: var(--neutral-50);
}

.menu-button span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px 0;
  background: var(--neutral-900);
}

.hero {
  padding: 96px 32px 64px;
  background:
    radial-gradient(circle at 86% 12%, rgba(53, 109, 243, 0.08), transparent 24%),
    var(--white);
}

.hero-inner {
  width: min(100%, 1280px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 64px;
  align-items: end;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 24px;
  color: var(--primary-600);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.eyebrow span { width: 32px; height: 2px; background: currentColor; }

.hero h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(44px, 5vw, 72px);
  font-weight: 760;
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.hero-description {
  margin: 32px 0 0;
  color: var(--neutral-600);
  font-size: 18px;
  line-height: 1.6;
}

.hero-note {
  padding-left: 24px;
  border-left: 2px solid var(--neutral-900);
}

.hero-note strong,
.hero-note span { display: block; }
.hero-note strong { margin-bottom: 8px; font-size: 16px; }
.hero-note span { color: var(--neutral-600); font-size: 14px; }

.product-section { padding: 0 32px 112px; }

.product-grid {
  width: min(100%, 1280px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.product-card {
  position: relative;
  min-height: 600px;
  padding: 32px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  isolation: isolate;
}

.product-card::after {
  position: absolute;
  inset: 0;
  z-index: -1;
  border: 1px solid rgba(16, 19, 26, 0.08);
  border-radius: inherit;
  content: "";
  pointer-events: none;
}

.product-card:hover .product-cta span { transform: translate(2px, -2px); }
.product-card:hover .id-card-front { transform: translate(-8px, -12px) rotate(-5deg); }
.product-card:hover .id-card-back { transform: translate(20px, 20px) rotate(8deg); }
.product-card:hover .lanyard-front { transform: translateX(-74%) rotate(-5deg); }
.product-card:hover .lanyard-back { transform: translateX(-26%) rotate(5deg); }

.product-link {
  position: absolute;
  inset: 0;
  z-index: 10;
  border-radius: inherit;
}

.product-link:focus-visible { outline: 3px solid var(--primary-500); outline-offset: 4px; }

.lanyard-card { background: var(--primary-50); color: var(--neutral-900); }
.card-card { background: var(--dark); color: var(--white); }

.product-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.product-index { opacity: 0.56; }
.product-kind { padding: 6px 10px; border: 1px solid currentColor; border-radius: 999px; opacity: 0.72; }

.product-copy { position: relative; z-index: 2; max-width: 400px; margin-top: 32px; }

.product-copy h3 {
  margin: 0 0 12px;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.product-copy p { max-width: 360px; margin: 0; color: var(--neutral-600); font-size: 15px; }
.card-card .product-copy p { color: #aeb6c5; }

.lanyard-visual {
  position: absolute;
  left: 50%;
  bottom: 32px;
  width: 360px;
  height: 360px;
  transform: translateX(-50%);
}

.lanyard-visual::before {
  position: absolute;
  left: 50%;
  bottom: 8px;
  width: 280px;
  height: 40px;
  border-radius: 50%;
  background: rgba(35, 77, 178, 0.18);
  filter: blur(24px);
  transform: translateX(-50%);
  content: "";
}

.lanyard-visual img {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: auto;
  height: 100%;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 20px 20px rgba(35, 77, 178, 0.16));
  transition: transform 300ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.lanyard-front { z-index: 2; transform: translateX(-70%) rotate(-3deg); }
.lanyard-back { transform: translateX(-30%) rotate(3deg); }

.card-visual {
  position: absolute;
  left: 50%;
  bottom: 40px;
  width: 420px;
  height: 340px;
  transform: translateX(-50%);
}

.id-card {
  position: absolute;
  bottom: 0;
  width: 188px;
  height: 292px;
  overflow: hidden;
  border-radius: 12px;
  background: var(--white);
  box-shadow: 0 28px 56px rgba(0, 0, 0, 0.3);
  transition: transform 300ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.id-card img { width: 100%; height: 100%; object-fit: cover; display: block; }
.id-card-front { left: 64px; z-index: 2; transform: rotate(-4deg); }
.id-card-back { right: 40px; transform: translate(16px, 16px) rotate(7deg); }

.product-cta {
  position: absolute;
  right: 32px;
  bottom: 32px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 750;
}

.product-cta span { font-size: 20px; transition: transform 160ms ease; }

.benefits { padding: 112px 32px; background: var(--neutral-50); }

.section-heading,
.benefit-grid {
  width: min(100%, 1280px);
  margin: 0 auto;
}

.section-heading { margin-bottom: 72px; }

.section-heading h2 {
  margin: 0;
  font-size: clamp(36px, 4vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.04em;
}

.benefit-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--neutral-300); }

.benefit { min-height: 216px; padding: 32px 32px 24px 0; border-right: 1px solid var(--neutral-300); }
.benefit + .benefit { padding-left: 32px; }
.benefit:last-child { border-right: 0; }
.benefit-number { color: var(--primary-600); font-size: 12px; font-weight: 800; }
.benefit h3 { margin: 48px 0 8px; font-size: 24px; line-height: 1.3; }
.benefit p { margin: 0; color: var(--neutral-600); font-size: 15px; }

.process {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(0, 1.2fr);
  gap: 96px;
  padding: 112px max(32px, calc((100vw - 1280px) / 2));
  background: var(--dark);
  color: var(--white);
}

.eyebrow-light { color: #8fb0ff; }
.process-copy h2 { margin: 0 0 40px; font-size: clamp(36px, 4vw, 56px); line-height: 1.16; letter-spacing: -0.04em; }
.process-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid #343b49; }

.process-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid #343b49;
}

.process-list li > span { color: #8fb0ff; font-size: 12px; font-weight: 800; }
.process-list strong { display: block; margin-bottom: 8px; font-size: 20px; }
.process-list p { margin: 0; color: #9ea8b8; font-size: 15px; }

.returning { padding: 96px 32px; }
.returning-inner { width: min(100%, 1280px); margin: 0 auto; display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; }
.returning h2 { margin: 0 0 12px; font-size: clamp(32px, 4vw, 48px); letter-spacing: -0.04em; }
.returning p:not(.eyebrow) { margin: 0; color: var(--neutral-600); }

.site-footer {
  width: min(calc(100% - 64px), 1280px);
  margin: 0 auto;
  padding: 48px 0 64px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.site-footer img { height: 24px; }
.site-footer p { margin: 12px 0 0; color: var(--neutral-600); font-size: 13px; }
.footer-info { display: flex; gap: 24px; color: var(--neutral-600); font-size: 12px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
  .main-nav { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-note { max-width: 440px; }
  .product-card { min-height: 560px; padding: 24px; }
  .lanyard-visual { width: 320px; height: 320px; }
  .card-visual { width: 360px; }
  .id-card { width: 168px; height: 260px; }
  .section-heading { grid-template-columns: 1fr; gap: 16px; }
  .process { grid-template-columns: 1fr; gap: 64px; }
  .returning-inner { align-items: flex-start; flex-direction: column; }
  .footer-info { flex-direction: column; gap: 4px; text-align: right; }
}

@media (max-width: 760px) {
  .site-header { height: 64px; }
  .header-inner { padding: 0 16px; }
  .brand img { height: 21px; }
  .preview-badge { display: none; }
  .header-actions { display: none; }
  .menu-button { display: block; }
  .main-nav.open {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 8px 16px 16px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 32px rgba(16, 19, 26, 0.12);
  }
  .main-nav.open a { min-height: 48px; display: flex; align-items: center; }
  .hero { padding: 64px 16px 40px; }
  .hero h1 { font-size: 40px; line-height: 1.18; }
  .hero h1 br { display: none; }
  .hero-description { margin-top: 24px; font-size: 16px; }
  .hero-note { padding-left: 16px; }
  .product-section { padding: 0 16px 72px; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: 520px; }
  .product-copy h3 { font-size: 30px; }
  .product-copy p { max-width: 280px; }
  .lanyard-visual { bottom: 32px; width: 300px; height: 300px; }
  .card-visual { bottom: 32px; width: 320px; height: 300px; }
  .id-card-front { left: 48px; }
  .id-card-back { right: 32px; }
  .product-cta { right: 24px; bottom: 24px; }
  .benefits { padding: 72px 16px; }
  .section-heading { margin-bottom: 48px; }
  .section-heading h2 { font-size: 36px; }
  .section-heading h2 br { display: none; }
  .benefit-grid { grid-template-columns: 1fr; }
  .benefit,
  .benefit + .benefit { min-height: auto; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--neutral-300); }
  .benefit h3 { margin: 24px 0 8px; }
  .process { gap: 48px; padding: 72px 16px; }
  .process-copy h2 { font-size: 36px; }
  .process-list li { grid-template-columns: 48px 1fr; gap: 8px; }
  .returning { padding: 72px 16px; }
  .returning h2 { font-size: 34px; }
  .returning .button { width: 100%; }
  .site-footer { width: calc(100% - 32px); padding: 40px 0; flex-direction: column; align-items: flex-start; }
  .footer-info { text-align: left; }
}

@media (max-width: 380px) {
  .hero h1 { font-size: 36px; }
  .product-card { min-height: 500px; }
  .lanyard-visual { width: 280px; height: 280px; }
  .card-visual { width: 292px; }
  .id-card { width: 152px; height: 236px; }
}