:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242836;
  --surface3: #2d3248;
  --border: #2d3248;
  --border-light: #3a3f58;
  --text: #e8eaed;
  --text2: #9aa0b4;
  --text3: #6b7394;
  --accent: #4fc3f7;
  --accent2: #81d4fa;
  --accent-dim: rgba(79,195,247,.12);
  --green: #66bb6a;
  --green-dim: rgba(102,187,106,.12);
  --red: #ef5350;
  --red-dim: rgba(239,83,80,.12);
  --yellow: #ffd54f;
  --orange: #ffa726;
  --purple: #ab47bc;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.5);
  --transition: all .25s cubic-bezier(.4,0,.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── Layout ── */
.app-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 100vh;
}

@media (max-width: 1024px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; position: fixed; top: 0; left: 0; width: 320px; height: 100vh; z-index: 1000; }
  .sidebar.open { display: block; }
  .sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 999; }
  .sidebar-overlay.open { display: block; }
  .mobile-toggle { display: flex !important; }
}

/* ── Sidebar ── */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 20px;
  overflow-y: auto;
  height: 100vh;
  position: sticky;
  top: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand .brand-icon {
  font-size: 1.6rem;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
}

.sidebar-brand h2 {
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-brand .brand-sub {
  font-size: .7rem;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .8px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-section h3 {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text3);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Study list */
.study-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.study-item {
  padding: 10px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text2);
  font-size: .85rem;
  text-align: left;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.study-item:hover {
  background: var(--surface2);
  color: var(--text);
}

.study-item.active {
  background: var(--accent-dim);
  border-color: rgba(79,195,247,.3);
  color: var(--accent);
  font-weight: 600;
}

.study-item .study-badge {
  font-size: .6rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  flex-shrink: 0;
}

.study-badge.avance { background: rgba(102,187,106,.15); color: var(--green); }
.study-badge.barometro { background: rgba(171,71,188,.15); color: var(--purple); }
.study-badge.autonomicas { background: rgba(255,167,38,.15); color: var(--orange); }

/* Ficha técnica */
.ficha-card {
  background: var(--surface2);
  border-radius: var(--radius-sm);
  padding: 14px;
  border: 1px solid var(--border);
}

.ficha-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: .8rem;
  border-bottom: 1px solid rgba(255,255,255,.04);
}

.ficha-row:last-child { border-bottom: none; }
.ficha-label { color: var(--text3); }
.ficha-value { color: var(--text); font-weight: 500; text-align: right; max-width: 60%; }

/* ── Main content ── */
.main-content {
  padding: 24px 32px 48px;
  overflow-y: auto;
  max-width: 1200px;
}

@media (max-width: 768px) {
  .main-content { padding: 16px; }
}

.mobile-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .85rem;
  font-weight: 500;
  margin-bottom: 16px;
  width: 100%;
}

/* ── Header ── */
.main-header {
  margin-bottom: 28px;
}

.main-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.main-header .description {
  color: var(--text2);
  font-size: .88rem;
  line-height: 1.7;
}

.method-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.method-tag {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .3px;
}

.tag-vd { background: rgba(255,213,79,.12); color: var(--yellow); border: 1px solid rgba(255,213,79,.25); }
.tag-cis { background: rgba(171,71,188,.12); color: var(--purple); border: 1px solid rgba(171,71,188,.25); }
.tag-ag { background: rgba(79,195,247,.12); color: var(--accent); border: 1px solid rgba(79,195,247,.25); }

/* ── Momentum Panel ── */
.momentum-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.momentum-panel h2 {
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.momentum-panel .hint {
  font-size: .78rem;
  color: var(--text3);
  margin-bottom: 16px;
}

.momentum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

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

.momentum-item label {
  font-size: .75rem;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.momentum-item input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  outline: none;
}

.momentum-item input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(79,195,247,.4);
  transition: transform .15s;
}

.momentum-item input[type=range]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.momentum-item input[type=range]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.momentum-value {
  font-size: .85rem;
  font-weight: 700;
  text-align: center;
  padding: 4px 0;
  border-radius: 4px;
  min-width: 48px;
}

.momentum-value.neutral { color: var(--text2); }
.momentum-value.boost { color: var(--green); }
.momentum-value.drag { color: var(--red); }

.momentum-applied {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  font-size: .8rem;
  color: var(--accent);
  border: 1px solid rgba(79,195,247,.2);
}

/* ── Data Table ── */
.table-section {
  margin-bottom: 28px;
}

.table-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--surface2);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--accent);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

thead th:first-child { border-radius: var(--radius) 0 0 0; }
thead th:last-child { border-radius: 0 var(--radius) 0 0; }

tbody td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255,255,255,.04);
  white-space: nowrap;
}

tbody tr { transition: background .15s; }
tbody tr:hover { background: rgba(79,195,247,.04); }
tbody tr:last-child td { border-bottom: none; }

td.partido-name {
  font-weight: 600;
  color: var(--text);
}

td.num { text-align: right; font-variant-numeric: tabular-nums; }

td.diff-positive { color: var(--green); font-weight: 600; }
td.diff-negative { color: var(--red); font-weight: 600; }
td.diff-neutral { color: var(--text3); }

/* Category rows (NS/NC/Abstención) */
tbody tr.cat-row { opacity: 0.5; }
tbody tr.cat-row td { font-style: italic; }

/* ── Chart ── */
.chart-section {
  margin-bottom: 28px;
}

.chart-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  position: relative;
  height: 420px;
}

/* ── Expandable Methodology ── */
.methodology-section {
  margin-bottom: 28px;
}

.expand-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.expand-toggle:hover { border-color: var(--accent); }
.expand-toggle .chevron { transition: transform .25s; font-size: 1.2rem; }
.expand-toggle.open .chevron { transform: rotate(180deg); }

.expand-content {
  display: none;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  animation: slideDown .3s ease;
}

.expand-content.open { display: block; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.method-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.method-card h3 {
  font-size: .9rem;
  margin-bottom: 10px;
  color: var(--accent);
}

.method-card p, .method-card li {
  font-size: .82rem;
  color: var(--text2);
  line-height: 1.7;
}

.method-card ul { padding-left: 16px; }
.method-card li { margin-bottom: 4px; }

/* Formula section */
.formula-section {
  margin-top: 20px;
  padding: 20px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.formula-section h3 {
  font-size: .9rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.formula-block {
  text-align: center;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin: 12px 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
  font-family: 'Courier New', monospace;
}

.formula-table {
  width: 100%;
  margin-top: 12px;
  font-size: .82rem;
}

.formula-table th {
  background: transparent;
  color: var(--accent);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: .75rem;
}

.formula-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255,255,255,.04);
  color: var(--text2);
}

/* Example card */
.example-card {
  margin-top: 20px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(79,195,247,.06), rgba(171,71,188,.06));
  border: 1px solid rgba(79,195,247,.2);
  border-radius: var(--radius);
}

.example-card h3 {
  font-size: .9rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.example-steps {
  font-size: .82rem;
  color: var(--text2);
}

.example-steps li {
  margin-bottom: 6px;
  line-height: 1.6;
}

.example-steps code {
  background: var(--surface2);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: .78rem;
  color: var(--accent);
}

/* ── Empty state ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  text-align: center;
  color: var(--text3);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: .5; }
.empty-state h2 { font-size: 1.2rem; color: var(--text2); margin-bottom: 8px; }
.empty-state p { font-size: .88rem; max-width: 400px; }

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 20px;
  color: var(--text3);
  font-size: .75rem;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* ── Loading / Status ── */
.status-bar {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: .82rem;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: fadeIn .3s;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.status-bar.info { background: var(--accent-dim); border: 1px solid rgba(79,195,247,.2); color: var(--accent); }
.status-bar.success { background: var(--green-dim); border: 1px solid rgba(102,187,106,.2); color: var(--green); }
.status-bar.error { background: var(--red-dim); border: 1px solid rgba(239,83,80,.2); color: var(--red); }

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }