:root {
  --bg: #f4f0e8;
  --bg-accent: #e7dfd2;
  --surface: rgba(255, 251, 244, 0.88);
  --surface-strong: #fffaf1;
  --ink: #18211d;
  --muted: #61706a;
  --line: rgba(24, 33, 29, 0.12);
  --brand: #145c44;
  --brand-strong: #0e4734;
  --signal: #b96932;
  --verified: #0d7f53;
  --shadow: 0 24px 60px rgba(33, 28, 17, 0.12);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  --sans: "Segoe UI", "Noto Sans KR", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(20, 92, 68, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(185, 105, 50, 0.12), transparent 24%),
    linear-gradient(180deg, #f6f1e9 0%, #ede5d7 100%);
}

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

code,
pre {
  font-family: var(--mono);
}

.page-shell {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 48px;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 251, 244, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand) 0%, #2d8c68 100%);
  color: white;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-copy {
  display: grid;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy small,
.topnav a,
.panel-text,
.hero-text,
.feature-card p,
.api-card p,
.entity-card p,
.detail-meta span,
.submission-result,
.checklist,
.architecture-grid p {
  color: var(--muted);
}

.topnav {
  display: inline-flex;
  gap: 18px;
  font-size: 0.95rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  padding: 48px 0 30px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--signal);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.76rem;
  font-weight: 700;
}

.hero h1,
.panel h2,
.feature-card h2 {
  margin: 0;
  line-height: 1.05;
}

.hero h1 {
  font-size: clamp(2.8rem, 4vw, 5rem);
  max-width: 10ch;
}

.hero-text {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: 1.06rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  font: inherit;
}

.button.primary {
  background: var(--brand);
  color: #fff;
}

.button.primary:hover {
  background: var(--brand-strong);
}

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

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.hero-metrics article,
.feature-card,
.panel,
.terminal-card,
.signal-card,
.entity-card,
.entity-detail,
.api-card,
.submission-side,
.architecture-grid article {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-metrics article {
  padding: 18px;
}

.hero-metrics strong {
  display: block;
  font-size: 0.86rem;
  color: var(--muted);
}

.hero-metrics span {
  display: block;
  margin-top: 10px;
  font-size: 1.8rem;
  font-weight: 700;
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.terminal-card,
.signal-card {
  padding: 20px;
}

.terminal-header {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}

.terminal-header span {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: #d6d0c5;
}

.terminal-card pre {
  margin: 0;
  white-space: pre-wrap;
  color: #e8f6f0;
}

.terminal-card {
  background: linear-gradient(180deg, #0f221c 0%, #142b24 100%);
}

.signal-card ul,
.checklist {
  padding-left: 18px;
}

.section-grid,
.api-grid,
.architecture-grid {
  display: grid;
  gap: 18px;
}

.section-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 12px 0 18px;
}

.feature-card {
  padding: 24px;
}

.feature-card h2 {
  margin-bottom: 12px;
  font-size: 1.5rem;
}

.panel {
  padding: 26px;
  margin-top: 18px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin-bottom: 20px;
}

.panel h2 {
  font-size: clamp(1.9rem, 3vw, 3rem);
}

.panel-text {
  max-width: 48ch;
  line-height: 1.7;
}

.explorer-controls,
.submission-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.explorer-controls label,
.stack-form label {
  display: grid;
  gap: 8px;
}

.explorer-controls label {
  min-width: 220px;
  flex: 1;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid rgba(24, 33, 29, 0.16);
  border-radius: 14px;
  background: rgba(255, 251, 244, 0.86);
  font: inherit;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.explorer-layout,
.submission-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
  margin-top: 18px;
}

.entity-list {
  display: grid;
  gap: 14px;
}

.entity-card {
  padding: 18px;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease;
}

.entity-card:hover,
.entity-card.active {
  transform: translateY(-2px);
  border-color: rgba(20, 92, 68, 0.35);
}

.type-chip,
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  border: 1px solid var(--line);
}

.status-chip.verified {
  color: var(--verified);
}

.status-chip.self_declared {
  color: var(--signal);
}

.entity-card-head,
.detail-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.entity-card h3,
.entity-detail h3,
.submission-side h3 {
  margin: 14px 0 8px;
}

.entity-detail {
  padding: 22px;
  min-height: 560px;
}

.detail-empty {
  display: grid;
  place-items: center;
  text-align: center;
  min-height: 100%;
}

.detail-claims,
.detail-sources {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.claim-row,
.source-row {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-strong);
}

.claim-row strong,
.source-row strong {
  display: block;
  margin-bottom: 6px;
}

.tab-button {
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  font: inherit;
}

.tab-button.active {
  background: var(--brand);
  color: white;
}

.submission-panel {
  display: none;
}

.submission-panel.active {
  display: block;
}

.code-card,
.submission-side {
  padding: 18px;
}

.code-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.code-card pre {
  margin: 0;
  white-space: pre-wrap;
  color: #133126;
}

.stack-form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.submission-result {
  min-height: 150px;
  padding: 14px;
  border-radius: 16px;
  border: 1px dashed rgba(24, 33, 29, 0.2);
  background: rgba(255, 251, 244, 0.82);
  line-height: 1.7;
}

.api-grid,
.architecture-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.api-card,
.architecture-grid article {
  padding: 18px;
}

.api-card code {
  display: inline-block;
  margin: 12px 0;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(20, 92, 68, 0.08);
}

.footer {
  margin-top: 24px;
  padding: 24px 0 8px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  align-content: start;
}

.footer-copy {
  margin: 14px 4px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-contact {
  margin: 10px 0 0;
  color: var(--muted);
}

.footer-contact a {
  color: var(--brand);
}

@media (max-width: 1080px) {
  .hero,
  .explorer-layout,
  .submission-layout,
  .section-grid,
  .api-grid,
  .architecture-grid {
    grid-template-columns: 1fr;
  }

  .panel-head {
    align-items: start;
    flex-direction: column;
  }

  .footer-grid {
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 20px, 1240px);
  }

  .topbar {
    border-radius: 24px;
    align-items: start;
    flex-direction: column;
  }

  .topnav {
    flex-wrap: wrap;
  }

  .hero-actions,
  .hero-metrics {
    grid-template-columns: 1fr;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }
}