:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-accent: #eef2ff;
  --card: #ffffff;
  --card-strong: #ffffff;
  --ink: #0f172a;
  --ink-soft: #64748b;
  --line: #dbe2ea;
  --line-strong: #cbd5e1;
  --brand: #0f62fe;
  --brand-strong: #0b4fd1;
  --brand-soft: #dbeafe;
  --warn-bg: #fff7ed;
  --warn-line: #fdba74;
  --warn-ink: #c2410c;
  --neutral-pill-bg: #e2e8f0;
  --neutral-pill-ink: #475569;
  --shadow: 0 14px 34px rgba(15, 23, 42, 0.1);
  --glass-bg: #ffffff;
  --glass-border: #dbe2ea;
  --rail-ink: #f8fafc;
  --api-bg: #0f172a;
  --api-ink: #e2e8f0;
  --font-body: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: ui-serif, Georgia, Cambria, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at top left, rgba(219, 234, 254, 0.65), transparent 34%),
    linear-gradient(180deg, #f8fafc 0%, var(--bg) 100%);
}

.page-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  text-decoration: none;
  color: inherit;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand);
}

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

.site-nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 8px 12px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--ink);
  background: var(--brand-soft);
}

.viewer-chip {
  padding: 6px 12px;
  background: var(--bg-accent);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
}

.viewer-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #334155;
  font-weight: 700;
}

.viewer-secondary {
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.nav-button {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--ink);
}

.hero {
  max-width: 640px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  line-height: 1.1;
  margin: 12px 0 24px;
  color: var(--ink);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brand);
  margin: 0;
}

.lede {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, filter 0.2s;
  border: none;
  font-family: inherit;
  font-size: 1rem;
}

.button:active {
  transform: scale(0.98);
}

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

.button-secondary {
  background: var(--bg-accent);
  color: var(--ink);
  border: 1px solid var(--line);
}

.surface {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.surface-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.surface-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 4px 0 0;
}

.stack-gap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.activity-review-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  background: linear-gradient(180deg, var(--bg-accent) 0%, rgba(255, 255, 255, 0.92) 100%);
  padding: 16px;
  border-radius: 16px;
  margin: 12px 0;
  border: 1px solid var(--line);
}

.activity-review-grid div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.activity-review-grid dt {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.activity-review-grid dd {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--brand);
}

.helper-copy {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

.status-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  text-transform: uppercase;
}

.status-pill-neutral {
  background: var(--neutral-pill-bg);
  color: var(--neutral-pill-ink);
}

.status-pill-warn {
  background: var(--warn-bg);
  color: var(--warn-ink);
}

.message-card {
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--line);
}

.message-card-neutral {
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-accent) 100%);
}

.message-card-warn {
  background: var(--warn-bg);
  border-color: var(--warn-line);
}

.message-card h2 {
  font-size: 1.1rem;
  margin: 0;
}

.message-card-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ink);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  border: 0;
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-accent) 100%);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
}

.checkbox-field input {
  width: auto;
  margin: 2px 0 0;
}

.readonly-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-accent) 100%);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.readonly-field span {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.readonly-field strong {
  font-size: 1rem;
  color: var(--brand);
}

.inline-step {
  border-top: 1px solid var(--line);
  padding-top: 32px;
  margin-top: 12px;
}

.inline-step[hidden] {
  display: none;
}

input, textarea, select {
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--card-strong);
  font: inherit;
  width: 100%;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(15, 98, 254, 0.14);
}

.api-output {
  font-family: monospace;
  font-size: 0.85rem;
  background: var(--api-bg);
  color: var(--api-ink);
  padding: 16px;
  border-radius: 12px;
  overflow: auto;
}

.api-output-copy {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.share-link-panel {
  background: var(--api-bg);
  color: var(--api-ink);
  padding: 16px;
  border-radius: 12px;
}

.share-link-result[hidden] {
  display: none;
}

.share-link-input {
  font-family: monospace;
}

.share-link-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.share-link-panel .helper-copy,
.share-link-panel .field span {
  color: var(--api-ink);
}

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

.history-card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 20px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.history-card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.history-reference {
  font-family: monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand);
  margin: 0 0 4px;
}

.history-summary {
  font-weight: 700;
  font-size: 1rem;
  margin: 0;
}

.history-pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.history-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.history-meta div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-meta dt {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.history-meta dd {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
}

.empty-state {
  padding: 40px 24px;
  text-align: center;
  background: linear-gradient(180deg, rgba(219, 234, 254, 0.35) 0%, rgba(255, 255, 255, 0.95) 100%);
  border-radius: 20px;
  border: 2px dashed var(--line-strong);
}

.empty-state-title {
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink);
}

.empty-state-copy {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

.site-footer {
  margin-top: auto;
  padding: 40px 0;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .grid-two {
    grid-template-columns: 1fr;
  }

  .activity-review-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header-actions {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .surface {
    padding: 24px;
  }

  .hero-title {
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .history-meta {
    grid-template-columns: 1fr;
  }
}