:root {
  --bg: #f5f1ea;
  --bg-strong: #f0ebe2;
  --card: rgba(255, 255, 255, 0.88);
  --card-strong: #fffdf9;
  --text: #1f2a33;
  --muted: #66727d;
  --line: rgba(31, 42, 51, 0.12);
  --accent: #204f5a;
  --accent-soft: rgba(32, 79, 90, 0.12);
  --danger: #8b3d32;
  --shadow: 0 18px 50px rgba(31, 42, 51, 0.08);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(32, 79, 90, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(120, 92, 44, 0.08), transparent 25%),
    linear-gradient(180deg, #faf6f0 0%, var(--bg) 42%, #f3eee7 100%);
}

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

a:hover {
  text-decoration: underline;
}

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

.page-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
  align-items: stretch;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(255, 252, 247, 0.96)),
    var(--card);
  box-shadow: var(--shadow);
}

.hero h1,
.panel-header h2,
.result-card h3,
.workspace-card h3 {
  margin: 0;
  font-family: "Spectral", serif;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1.02;
}

.hero-text,
.panel-intro,
.result-excerpt,
.answer-body,
.answer-list,
.section-meta {
  color: var(--muted);
}

.hero-text {
  max-width: 60ch;
  font-size: 1.02rem;
  line-height: 1.7;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.stat-label {
  display: block;
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 10px;
}

.stat-card strong {
  font-size: 1.6rem;
  font-weight: 600;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.top-nav {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: inline-flex;
  gap: 10px;
  margin: 24px 0;
  padding: 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(250, 246, 240, 0.92);
  backdrop-filter: blur(16px);
}

.tab-button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 12px 20px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.tab-button.is-active {
  color: white;
  background: var(--accent);
  box-shadow: 0 8px 18px rgba(32, 79, 90, 0.18);
}

.layout {
  display: grid;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.panel {
  padding: 28px;
  border-radius: 30px;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
}

.panel-header {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  align-items: end;
  margin-bottom: 24px;
}

.panel-intro {
  margin: 0;
  line-height: 1.65;
}

.query-form,
.workspace-toolbar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  align-items: end;
}

.workspace-toolbar {
  grid-template-columns: 1fr auto;
}

.field {
  display: grid;
  gap: 8px;
}

.field.wide {
  grid-column: span 4;
}

.field label {
  font-size: 0.92rem;
  font-weight: 600;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid rgba(31, 42, 51, 0.14);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid rgba(32, 79, 90, 0.22);
  border-color: rgba(32, 79, 90, 0.3);
}

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

.primary-button,
.secondary-button,
.save-button,
.danger-button {
  border: 0;
  border-radius: 999px;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 600;
}

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

.secondary-button,
.save-button {
  background: var(--accent-soft);
  color: var(--accent);
}

.save-button.is-saved {
  background: rgba(46, 98, 68, 0.12);
  color: #2e6244;
}

.danger-button {
  background: rgba(139, 61, 50, 0.12);
  color: var(--danger);
}

.section-meta {
  margin: 18px 0 22px;
  font-size: 0.95rem;
}

.result-grid,
.workspace-grid,
.answer-grid {
  display: grid;
  gap: 18px;
}

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

.answer-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 24px;
}

.result-card,
.workspace-card,
.answer-card,
.empty-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px;
  background: var(--card-strong);
}

.result-head,
.workspace-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.result-heading {
  display: flex;
  gap: 14px;
  align-items: start;
}

.source-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.result-meta {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.result-excerpt {
  margin: 18px 0;
  line-height: 1.7;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(31, 42, 51, 0.06);
  color: var(--muted);
  font-size: 0.85rem;
}

.result-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.92rem;
}

.answer-body {
  line-height: 1.8;
}

.answer-list {
  margin: 0;
  padding-left: 18px;
  line-height: 1.7;
}

.answer-list.empty-list {
  padding-left: 18px;
}

.empty-state,
.empty-card {
  color: var(--muted);
}

.workspace-fields {
  display: grid;
  gap: 16px;
  margin: 18px 0;
}

@media (max-width: 1024px) {
  .hero,
  .panel-header,
  .query-form,
  .workspace-toolbar,
  .result-grid,
  .workspace-grid,
  .answer-grid {
    grid-template-columns: 1fr;
  }

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

  .field.wide {
    grid-column: span 1;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 24px 16px 60px;
  }

  .hero,
  .panel {
    padding: 22px;
    border-radius: 24px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .top-nav {
    width: 100%;
    justify-content: space-between;
  }

  .tab-button {
    flex: 1;
    text-align: center;
  }

  .result-head,
  .workspace-head,
  .result-heading {
    flex-direction: column;
  }
}