:root {
  --dark: #2B2D42;
  --muted: #5E677A;
  --surface: #EDF2F4;
  --accent: #EF233C;
  --surface-border: rgba(94, 103, 122, 0.24);
  --ink-soft: rgba(43, 45, 66, 0.82);
  --text: #2B2D42;
  --border: rgba(94, 103, 122, 0.24);
  --success: #15803d;
  --warning: #c2410c;
  --danger: #b91c1c;
  --shadow: 0 8px 24px rgba(43, 45, 66, 0.06);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --nav-height: 76px;
  --focus-ring: rgba(192, 31, 51, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  color: var(--text);
  background: var(--surface);
  line-height: 1.6;
}

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

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Top bar ── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--nav-height);
  padding: 18px 28px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  min-width: 0;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand-title {
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.brand-title .accent {
  color: var(--accent);
}

.brand-subtitle {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.2;
}

.brand-shortcut {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 12px;
  min-height: 44px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--dark);
  font-size: 0.84rem;
  font-weight: 700;
  text-align: center;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.brand-shortcut:hover {
  border-color: rgba(239, 35, 60, 0.38);
  color: var(--accent);
}

/* ── Navigation ── */

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 14px;
  color: var(--muted);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.88rem;
  font-weight: 600;
  text-align: center;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.nav-link:hover {
  background: rgba(43, 45, 66, 0.06);
  color: var(--dark);
}

.nav-link.active,
.nav-link[aria-current="page"] {
  background: var(--accent);
  color: #fff;
}

/* ── Page shell ── */

.page {
  flex: 1;
  width: min(1240px, calc(100% - 40px));
  margin: 28px auto 40px;
  min-width: 0;
}

/* ── Hero ── */

.hero {
  padding: 30px 32px;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 8px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(239, 35, 60, 0.08);
}

.hero h1 {
  margin: 14px 0 10px;
  font-size: clamp(2rem, 3vw, 3.3rem);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 0;
  max-width: 760px;
  color: var(--ink-soft);
  font-size: 1.06rem;
  line-height: 1.68;
  font-weight: 500;
}

/* ── Grid layouts ── */

.grid {
  display: grid;
  gap: 18px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

/* ── Card ── */

.card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 22px;
  min-width: 0;
  overflow-wrap: anywhere;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

a.card:hover {
  border-color: rgba(239, 35, 60, 0.38);
  box-shadow: 0 24px 44px rgba(43, 45, 66, 0.09);
  transform: translateY(-3px);
}

.card h2,
.card h3 {
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.muted {
  color: var(--muted);
}

/* ── Metrics ── */

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

.metric {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border);
  min-width: 0;
}

.metric-label {
  display: block;
  margin-bottom: 6px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.metric-value {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  overflow-wrap: anywhere;
}

/* ── Buttons ── */

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 16px;
  background: var(--accent);
  color: #fff;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  letter-spacing: -0.01em;
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(239, 35, 60, 0.18);
}

.btn.secondary {
  background: transparent;
  color: var(--dark);
  border: 2px solid var(--border);
}

.btn.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: none;
}

.btn.warning {
  background: var(--warning);
}

.btn.danger {
  background: var(--danger);
}

/* ── Chips & dots ── */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border-radius: 8px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  background: rgba(43, 45, 66, 0.06);
  border: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--muted);
}

.dot.ok {
  background: var(--success);
}

.dot.warn {
  background: var(--warning);
}

.dot.error {
  background: var(--danger);
}

/* ── Form fields ── */

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  color: var(--muted);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.84rem;
  font-weight: 600;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.78);
  color: var(--text);
  font: inherit;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: rgba(239, 35, 60, 0.40);
  box-shadow: 0 0 0 4px rgba(239, 35, 60, 0.08);
}

/* ── Stack layout ── */

.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Log box ── */

.log {
  max-height: 180px;
  overflow-y: auto;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.8rem;
  line-height: 1.55;
}

/* ── Empty state ── */

.empty {
  padding: 16px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.54);
  overflow-wrap: anywhere;
}

/* ── Kicker ── */

.kicker {
  margin: 0 0 6px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Footnote ── */

.footnote {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

/* ── Footer ── */

.footer {
  padding: 0 28px 24px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--muted);
  font-size: 0.8rem;
}

.brand-shortcut:focus-visible,
.nav-link:focus-visible,
.btn:focus-visible,
a.card:focus-visible,
.field input:focus-visible,
.field select:focus-visible,
.field textarea:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--focus-ring);
}

.brand-shortcut:focus-visible,
.nav-link:focus-visible,
.btn:focus-visible {
  transform: translateY(-1px);
}

/* ── Responsive ── */

@media (max-width: 980px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 18px;
  }

  .nav {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .page {
    width: min(100%, calc(100% - 24px));
    margin: 20px auto 28px;
  }

  .grid.two,
  .grid.three,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .hero,
  .card {
    padding: 20px;
  }
}

@media (max-width: 640px) {
  .brand {
    width: 100%;
    gap: 10px;
  }

  .brand-copy {
    flex: 1;
  }

  .brand-subtitle {
    font-size: 0.7rem;
  }

  .brand-shortcut {
    width: 100%;
  }

  .nav-link {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .btn-row .btn {
    flex: 1 1 100%;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}