:root {
  --color-bg: #0f1419;
  --color-surface: #1a222c;
  --color-surface-elevated: #232d3a;
  --color-text: #e8edf4;
  --color-text-muted: #9aa8b8;
  --color-accent: #3d9cf0;
  --color-accent-hover: #5eb0f7;
  --color-user: #4ecdc4;
  --color-user-dim: rgba(78, 205, 196, 0.2);
  --color-seller: #7dd87d;
  --color-seller-dim: rgba(125, 216, 125, 0.2);
  --color-ai: #a78bfa;
  --color-ai-dim: rgba(167, 139, 250, 0.18);
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: "Noto Sans KR", system-ui, -apple-system, sans-serif;
  --header-h: 4rem;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
  min-height: var(--header-h);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-text);
}

.logo-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 30%,
    #5eb0f7,
    #6366f1 45%,
    #7c3aed 100%
  );
  box-shadow: 0 0 0 2px rgba(94, 176, 247, 0.35);
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo-en {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  text-transform: lowercase;
  background: linear-gradient(90deg, #5eb0f7, #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-ko {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 8px;
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.nav-toggle-bar {
  display: block;
  width: 1.35rem;
  height: 2px;
  background: var(--color-text);
  margin-inline: auto;
  transition: transform var(--transition), opacity var(--transition);
}

.site-header.menu-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.menu-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header.menu-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.nav-list a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-list a:hover {
  color: var(--color-text);
}

/* Hero */
.hero {
  position: relative;
  min-height: auto;
  padding: 2.5rem 0 3rem;
  background: linear-gradient(
    165deg,
    #121a24 0%,
    var(--color-bg) 45%,
    #151d28 100%
  );
}

.hero--split .hero-split-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero--split .hero-split-inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
    gap: 2.5rem;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0;
  max-width: 36rem;
}

.hero-visual {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.hero-promo-img {
  width: 100%;
  height: auto;
  vertical-align: middle;
  display: block;
}

.hero-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hero-title {
  margin: 0 0 1rem;
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero-title-ko {
  font-weight: 600;
  color: var(--color-text-muted);
}

.hero-tagline {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
}

.hero-tagline strong {
  color: var(--color-accent-hover);
  font-weight: 700;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 28rem;
  font-size: 1.02rem;
  color: var(--color-text-muted);
}

.hero-em {
  color: var(--color-text);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #0f1419;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #0f1419;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline:hover {
  background: rgba(61, 156, 240, 0.12);
  color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-title {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-intro {
  margin: 0 0 2.5rem;
  max-width: 40rem;
  color: var(--color-text-muted);
  font-size: 1.02rem;
}

.hero-tagline--emph {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.hero-tagline--emph strong {
  color: var(--color-accent-hover);
}

.section-lead.definition {
  font-size: 1.12rem;
  color: var(--color-text);
  line-height: 1.75;
  max-width: 48rem;
  margin: 0 0 1.25rem;
}

.section-lead.definition strong {
  color: var(--color-accent-hover);
  font-weight: 600;
}

.pull-quote {
  margin: 1.5rem 0 2rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: rgba(61, 156, 240, 0.1);
  border-left: 4px solid var(--color-accent);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
}

.pull-quote--accent {
  background: rgba(78, 205, 196, 0.1);
  border-left-color: var(--color-user);
}

.subsection-title--inline {
  margin-top: 2rem;
}

.seongnam {
  background: var(--color-bg);
  border-block: 1px solid var(--color-border);
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.pain-card {
  margin: 0;
  padding: 1.25rem 1.35rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-accent);
}

.pain-card p {
  margin: 0 0 0.75rem;
  font-size: 0.98rem;
  color: var(--color-text-muted);
  font-style: italic;
  line-height: 1.6;
}

.pain-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.flow {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.flow-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.flow-step:first-child {
  padding-top: 0;
}

.flow-step-num {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-accent), #6366f1);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  display: grid;
  place-items: center;
}

.flow-step-title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.flow-step-body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.biz-pillars {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.biz-pillars li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 1.25rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.biz-pillar-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.biz-pillar-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.section-intro--tight {
  margin-bottom: 1.25rem;
}

.flow-steps--compact .flow-step {
  padding: 1rem 0;
}

.flow-steps--compact .flow-step:first-child {
  padding-top: 0;
}

.about {
  padding-top: 3rem;
}

.features {
  background: var(--color-bg);
  border-block: 1px solid var(--color-border);
}

.feature-group {
  margin-bottom: 2.75rem;
}

.feature-group:last-of-type {
  margin-bottom: 0;
}

.feature-group-title {
  margin: 0 0 1.25rem;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.badge-user {
  background: var(--color-user-dim);
  color: var(--color-user);
}

.badge-seller {
  background: var(--color-seller-dim);
  color: var(--color-seller);
}

.feature-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-user);
  margin-bottom: 0.65rem;
}

.feature-badge--seller {
  color: var(--color-seller);
}

.feature-badge--ai {
  color: var(--color-ai);
}

.feature-card--user {
  border-color: rgba(78, 205, 196, 0.25);
}

.feature-card--user:hover {
  border-color: rgba(78, 205, 196, 0.45);
}

.feature-card--seller {
  border-color: rgba(125, 216, 125, 0.25);
}

.feature-card--seller:hover {
  border-color: rgba(125, 216, 125, 0.45);
}

.feature-card--ai {
  border-color: rgba(167, 139, 250, 0.28);
  background: linear-gradient(
    145deg,
    var(--color-surface-elevated) 0%,
    rgba(167, 139, 250, 0.06) 100%
  );
}

.feature-card--ai:hover {
  border-color: rgba(167, 139, 250, 0.5);
}

.ai-section {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.subsection-title {
  margin: 2.25rem 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.ai-section .subsection-title:first-of-type {
  margin-top: 0;
}

.feature-grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.roadmap {
  margin-top: 2.5rem;
  padding: 1.5rem 1.75rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.roadmap-title {
  margin-top: 0 !important;
  margin-bottom: 1rem !important;
  color: var(--color-text);
}

.roadmap-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.roadmap-list li {
  margin-bottom: 0.65rem;
}

.roadmap-list li:last-child {
  margin-bottom: 0;
}

.roadmap-list strong {
  color: var(--color-accent);
  font-weight: 600;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.feature-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover {
  border-color: rgba(61, 156, 240, 0.35);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.feature-title {
  margin: 0 0 0.65rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.feature-desc {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.cta {
  text-align: center;
}

.cta-inner .section-title {
  margin-bottom: 0.75rem;
}

.cta-text {
  margin: 0 auto 1.25rem;
  max-width: 36rem;
  color: var(--color-text-muted);
}

.cta-text--punch {
  font-size: 1.12rem;
  color: var(--color-text);
  line-height: 1.55;
}

.cta-text--muted {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.cta-oneline {
  margin: 0 auto 1.5rem;
  max-width: 40rem;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-brand {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.footer-logo {
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-tag {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-address {
  font-style: normal;
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.footer-address p {
  margin: 0 0 0.35rem;
}

.footer-address strong {
  color: var(--color-text);
  font-weight: 600;
}

.footer-copy {
  margin: 0;
  padding-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.85;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition),
      visibility var(--transition);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    width: min(1120px, 100% - 2rem);
    margin-inline: auto;
  }

  .nav-list a {
    display: block;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  .hero {
    padding: 2rem 0 2.5rem;
  }

  .section {
    padding: 3rem 0;
  }
}

@media (min-width: 769px) {
  .site-nav {
    display: block !important;
  }
}