:root {
  --bg: #0b0c10;
  --panel: #111318;
  --card: #14171f;
  --text: #e9ecf1;
  --muted: #b8c2d1; /* Increased contrast for better readability in dark mode */
  --primary: #0f6b72; /* brand teal */
  --primary-2: #0a4f56; /* deeper teal */
  --border: #222836;
  --good: #18b26b;
  --warn: #ffb020;
  --danger: #e5484d;
  --shadow: 0 8px 24px rgba(0,0,0,.25);
  --table-stats-bg: color-mix(in oklab, var(--card) 95%, var(--panel) 5%); /* For N, R² rows */
  --table-stats-border: var(--border);
}
[data-theme="light"] {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #0b1020;
  --muted: #5c6370;
  --primary: #0f6b72; /* brand teal */
  --primary-2: #0a4f56; /* deeper teal */
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(16,24,40,.08);
  --table-stats-bg: #f9fafb; /* For N, R² rows in light mode */
  --table-stats-border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14.5px/1.45 system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

/* Header */
.sb-header {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; background: color-mix(in oklab, var(--panel) 92%, transparent 8%);
  border-bottom: 1px solid var(--border); backdrop-filter: blur(8px);
}
.sb-brand { display: flex; align-items: baseline; gap: 10px; }
.sb-logo { max-height: 22px; height: auto; width: auto; }
.sb-title { font-weight: 700; letter-spacing: .2px; }
.sb-subtitle { color: var(--muted); font-size: 12.5px; }
.sb-actions { display: flex; gap: 8px; align-items: center; }

/* Shell */
.sb-shell { 
  display: grid; 
  grid-template-columns: 320px 1fr; 
  gap: 20px; 
  padding: 20px; 
  background: var(--bg);
  min-height: calc(100vh - 86px);
}
.sb-sidebar { position: sticky; top: 66px; height: calc(100dvh - 86px); overflow: auto; }
.sb-main { 
  min-height: calc(100dvh - 86px); 
  background: var(--bg);
}

/* Cards */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px; box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }
.card-title { margin: 0 0 10px 0; font-size: 16px; font-weight: 700; }
.subcard { margin-top: 16px; background: color-mix(in oklab, var(--card) 90%, var(--panel) 10%); border-radius: 12px; padding: 14px; border: 1px dashed var(--border); }
.subcard-title { margin: 0 0 8px 0; font-size: 15px; font-weight: 700; }
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.card-actions { display: flex; align-items: center; gap: 8px; }

/* Quality Selection Modal Styles */
.quality-option:hover {
  border-color: #3b82f6 !important;
  background-color: #f8fafc !important;
}

.quality-option input[type="radio"]:checked + div {
  color: #3b82f6 !important;
}

.quality-option:has(input[type="radio"]:checked) {
  border-color: #3b82f6 !important;
  background-color: #eff6ff !important;
}

/* Modern Modal Styles */
.modern-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease-out;
  padding: 20px;
  box-sizing: border-box;
}

.modern-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modern-modal-content {
  position: relative;
  background: white;
  border-radius: 16px;
  width: 100%;
  max-width: 500px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  animation: slideIn 0.3s ease-out;
  margin: auto;
}

.modern-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 24px 0 24px;
  margin-bottom: 20px;
}

.modern-modal-header .modal-title {
  display: flex;
  align-items: center;
}

.modern-modal-close {
  background: none;
  border: none;
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  color: #6b7280;
  transition: all 0.2s ease;
}

.modern-modal-close:hover {
  background: #f3f4f6;
  color: var(--text);
}

.modern-modal-body {
  padding: 0 24px 20px 24px;
}

.modern-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 20px 24px 24px 24px;
  border-top: 1px solid #e5e7eb;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-ghost {
  background: #f9fafb;
  color: var(--text);
  border: 1px solid #d1d5db;
}

.btn-ghost:hover {
  background: #f3f4f6;
  border-color: #9ca3af;
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
  border: none;
}

.btn-danger:hover {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Controls */
.input, select.input, textarea.input {
  width: 100%; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: color-mix(in oklab, var(--card) 96%, #000 4%); color: var(--text);
}
.input:focus { outline: 2px solid color-mix(in oklab, var(--primary) 40%, transparent); border-color: var(--primary); }
.field-label { 
  display: block; 
  margin: 0 0 8px 0; 
  color: var(--text); 
  font-size: 14px; 
  font-weight: 600; 
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.btn {
  --bgc: var(--panel);
  display: inline-flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bgc); color: var(--text);
}
.btn:hover { border-color: color-mix(in oklab, var(--primary) 40%, var(--border)); }
.btn-primary { --bgc: linear-gradient(180deg, var(--primary), var(--primary-2)); color: #fff; border: none; }
.btn-ghost { background: transparent; border-color: var(--border); }
.btn-ghost.danger { color: var(--danger); border-color: color-mix(in oklab, var(--danger) 30%, var(--border)); }

/* Neutral gray button that turns green on hover */
.btn-neutral {
  background: #f3f4f6;
  color: var(--text);
  border: 1px solid #d1d5db;
}
.btn-neutral:hover {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  color: #ffffff;
  border-color: transparent;
}
.btn-neutral:disabled,
.btn-neutral[disabled] {
  background: #e5e7eb;
  color: #9ca3af;
  border-color: #e5e7eb;
}

.icon-btn {
  height: 28px; padding: 0 8px; border-radius: 8px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); cursor: pointer;
}
.icon-btn:hover { color: var(--text); border-color: color-mix(in oklab, var(--primary) 40%, var(--border)); }
.icon-btn.danger:hover { color: var(--danger); border-color: color-mix(in oklab, var(--danger) 40%, var(--border)); }

.link { color: inherit; text-decoration: none; font-weight: 600; }
.link:hover { color: var(--primary); }

/* Lists */
.list { list-style: none; padding: 0; margin: 0; }
.list-row { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.list-row:last-child { border-bottom: none; }
.row-left { display: flex; align-items: center; gap: 8px; }
.row-right { display: flex; align-items: center; gap: 8px; }
.badge { padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); font-size: 12px; color: var(--muted); }
.badge.warn { color: var(--warn); border-color: color-mix(in oklab, var(--warn) 40%, var(--border)); }
.muted { color: var(--muted); }
.small { font-size: 12px; color: var(--text); }
.small.muted { color: var(--muted); }

/* Sessions Scroll Container */
.sessions-scroll-container {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  margin-top: 8px;
}

.sessions-scroll-container::-webkit-scrollbar {
  width: 6px;
}

.sessions-scroll-container::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.sessions-scroll-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
  transition: background 0.2s ease;
}

.sessions-scroll-container::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

.sessions-scroll-container .list {
  padding: 8px;
}

.sessions-scroll-container .list-row {
  padding: 12px 8px;
  border-bottom: 1px solid var(--border);
  transition: background-color 0.2s ease;
}

.sessions-scroll-container .list-row:hover {
  background-color: var(--bg-secondary);
}

.sessions-scroll-container .list-row:last-child {
  border-bottom: none;
}

/* Modern Search Bar */
.modern-search {
  margin-bottom: 16px;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border: 2px solid #e2e8f0;
  border-radius: 16px;
  padding: 0;
  min-height: 56px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.search-container.equation-container {
  align-items: flex-start;
  min-height: 120px;
}

.search-container:hover {
  border-color: #cbd5e1;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.search-container:focus-within {
  border-color: var(--primary);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.2), 0 6px 16px rgba(0, 0, 0, 0.08);
  transform: translateY(-3px);
}

.search-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(147, 51, 234, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.search-container:focus-within::before {
  opacity: 1;
}

.search-icon {
  position: absolute;
  left: 18px;
  color: #9ca3af;
  transition: all 0.4s ease;
  z-index: 2;
  pointer-events: none;
}

.search-container:focus-within .search-icon {
  color: var(--primary);
  transform: scale(1.1);
}

.search-container input,
.search-container select,
.search-container textarea {
  width: 100%;
  height: 56px;
  padding: 16px 20px 16px 56px;
  border: none;
  background: transparent;
  color: #1f2937;
  font-size: 16px;
  font-weight: 500;
  outline: none;
  transition: all 0.4s ease;
  letter-spacing: 0.01em;
}

.search-container textarea {
  height: auto;
  min-height: 120px;
  resize: vertical;
  padding-top: 20px;
  padding-bottom: 20px;
  padding-left: 56px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.search-container select {
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 18px center;
  background-size: 20px 20px;
  padding-right: 50px;
}

.search-container select:hover {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
}

.search-container:focus-within select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
}

.search-container input::placeholder,
.search-container textarea::placeholder {
  color: #9ca3af;
  font-weight: 400;
  transition: color 0.3s ease;
}

.search-container:focus-within input::placeholder,
.search-container:focus-within textarea::placeholder {
  color: #6b7280;
}

.search-clear {
  position: absolute;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  background: #f3f4f6;
  color: #6b7280;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 2;
}

.search-clear:hover {
  background: #e5e7eb;
  color: var(--text);
  transform: scale(1.05);
}

.search-clear:active {
  transform: scale(0.95);
}

/* Dark theme support for search */
[data-theme="dark"] .search-container {
  background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
  border-color: #374151;
}

[data-theme="dark"] .search-container:hover {
  border-color: #4b5563;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .search-container:focus-within {
  border-color: var(--primary);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.3), 0 6px 16px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .search-container input,
[data-theme="dark"] .search-container select,
[data-theme="dark"] .search-container textarea {
  color: #e5e7eb;
}

[data-theme="dark"] .search-container input::placeholder,
[data-theme="dark"] .search-container textarea::placeholder {
  color: #9ca3af;
}

[data-theme="dark"] .search-icon {
  color: #6b7280;
}

[data-theme="dark"] .search-container:focus-within .search-icon {
  color: var(--primary);
}

[data-theme="dark"] .search-clear {
  background: #374151;
}

[data-theme="dark"] .field-label {
  color: var(--text);
}

[data-theme="dark"] .search-clear:hover {
  background: #4b5563;
  color: #d1d5db;
}

/* Search + uploader */
.search input { width: 100%; }
.uploader .dropzone {
  margin-top: 6px; display: block; position: relative; border: 1px dashed var(--border);
  border-radius: 12px; padding: 18px; text-align: center; cursor: pointer;
  background: color-mix(in oklab, var(--card) 92%, transparent);
}
.uploader .dropzone input[type=file]{ position:absolute; inset:0; width:100%; height:100%; opacity:0; cursor:pointer; }
.dz-inner { display:flex; gap:10px; align-items:center; justify-content:center; color: var(--muted); }
.dz-inner svg { width:18px; height:18px; fill: var(--muted); }

/* Grid & layout */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.grid-3 { 
  display: grid; 
  grid-template-columns: repeat(3, 1fr); 
  gap: 24px; 
  margin-bottom: 24px;
}
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.toolbar { display:flex; gap:10px; justify-content:flex-end; margin-top: 12px; }
/* Modern Results Header */
.modern-results-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  border-radius: 16px;
  padding: 24px 32px;
  margin: 0 0 24px 0;
  box-shadow: 0 8px 32px color-mix(in oklab, var(--primary) 30%, #000 0%);
  position: relative;
  overflow: hidden;
}

.modern-results-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  pointer-events: none;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.regression-type-badge {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 8px 16px;
  transition: all 0.3s ease;
}

.regression-type-badge:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.regression-type {
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  letter-spacing: -0.3px;
}

.header-actions {
  position: relative;
  z-index: 1;
}

.modern-edit-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  padding: 10px 16px;
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.modern-edit-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  color: #ffffff;
  text-decoration: none;
}

.modern-edit-btn svg {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  position: relative;
  z-index: 1;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
}

.meta-icon {
  color: rgba(255, 255, 255, 0.8);
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.meta-label {
  font-weight: 500;
  opacity: 0.8;
}

.meta-value {
  font-weight: 600;
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.meta-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 1px;
}

/* Legacy page-title for backward compatibility */
.page-title { display:flex; align-items: baseline; gap: 12px; margin: 8px 0 14px; }

/* Segment (radio buttons) */
.segment { display: inline-flex; gap: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.segment label { display: inline-flex; align-items:center; gap:6px; padding: 8px 10px; cursor: pointer; }
.segment input { appearance: none; width: 0; height: 0; }
.segment label span { opacity: .8; }
.segment input:checked + span { opacity: 1; color: var(--text); font-weight: 700; }
.segment label:not(:last-child){ border-right: 1px solid var(--border); }

/* Switch */
.switch { display:flex; align-items:center; gap:8px; cursor:pointer; }
.switch input { display:none; }
.switch span {
  width: 38px; height: 22px; background: color-mix(in oklab, var(--muted) 30%, transparent);
  border-radius: 999px; position: relative; border:1px solid var(--border);
}
.switch span::after {
  content:""; position:absolute; top:50%; left:2px; transform: translateY(-50%);
  width:18px; height:18px; background:#fff; border-radius:999px; transition: left .2s ease;
}
.switch input:checked + span { background: color-mix(in oklab, var(--primary) 60%, transparent); }
.switch input:checked + span::after { left: 18px; }
.switch em { color: var(--text); font-style: normal; font-weight: 500; }
.switch label { color: var(--text); }

/* Media */
.media img {
  display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border);
  background: color-mix(in oklab, var(--card) 92%, transparent);
}

/* Table */
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 12px; }
.table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; color: var(--text); }
.table thead th { position: sticky; top: 0; background: color-mix(in oklab, var(--card) 90%, #000 10%); z-index: 1; color: var(--text); font-weight: 600; }
.table tbody tr[style*="background-color"] { background-color: var(--table-stats-bg) !important; }
.table tbody tr[style*="background-color"] td { color: var(--text) !important; }
.table tbody tr[style*="background-color"] td strong { color: var(--text) !important; font-weight: 600; }
.table-stats-row { background-color: var(--table-stats-bg) !important; border-top: 2px solid var(--table-stats-border) !important; }
.table-stats-row td { color: var(--text) !important; }
.table-stats-row td strong { color: var(--text) !important; font-weight: 600; }
.table tbody tr:hover { background: color-mix(in oklab, var(--card) 85%, transparent); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }

/* Theme toggle icons */
#themeToggle .icon-moon { display: none; width: 18px; height: 18px; fill: var(--muted); }
#themeToggle .icon-sun { display: block; width: 18px; height: 18px; fill: var(--muted); }
[data-theme="light"] #themeToggle .icon-sun { display: none; }
[data-theme="light"] #themeToggle .icon-moon { display: block; }

/* Responsive */
@media (max-width: 1100px){
  .sb-shell { grid-template-columns: 1fr; }
  .sb-sidebar { position: static; height: auto; order: 2; }
  .sb-main { order: 1; }
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .grid-3 { grid-template-columns: repeat(2,1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}
/* Big chat-like equation box */
.equation-wrap { margin-top: 12px; }
.equation-box {
  min-height: 220px;
  resize: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 14.5px;
  line-height: 1.5;
  padding: 14px 14px 32px 14px; /* bottom room for hint */
}

.equation-box:disabled {
  background-color: color-mix(in oklab, var(--card) 90%, transparent);
  color: var(--muted);
  cursor: not-allowed;
}

.equation-box.has-errors {
  border-color: #e5484d !important;
  background-color: #fef2f2 !important;
  border-width: 2px !important;
}

.equation-box.has-errors:focus {
  border-color: #e5484d !important;
  box-shadow: 0 0 0 3px rgba(229, 72, 77, 0.1) !important;
  outline: none !important;
}

.autocomplete-dropdown {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  z-index: 1000;
  max-height: 240px;
  overflow-y: auto;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: slideInUp 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: top;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.autocomplete-item {
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 1px solid rgba(229, 231, 235, 0.5);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.autocomplete-item::before {
  content: "📊";
  font-size: 12px;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.autocomplete-item:hover {
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  transform: translateX(2px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.autocomplete-item:hover::before {
  opacity: 1;
}

.autocomplete-item:last-child {
  border-bottom: none;
  border-radius: 0 0 12px 12px;
}

.autocomplete-item:first-child {
  border-radius: 12px 12px 0 0;
}

.autocomplete-item.highlighted {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  color: white;
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  animation: pulse 2s infinite;
}

.autocomplete-item.highlighted::before {
  content: "✨";
  opacity: 1;
  animation: sparkle 1.5s ease-in-out infinite;
}

.autocomplete-item.highlighted:hover {
  background: linear-gradient(135deg, var(--primary-2) 0%, #1e40af 100%);
  transform: translateX(6px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
  animation: none;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  }
  50% {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.5);
  }
}

@keyframes sparkle {
  0%, 100% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.1) rotate(180deg);
  }
}

.equation-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.equation-status.error {
  color: var(--danger);
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border: 1px solid rgba(229, 72, 77, 0.2);
  box-shadow: 0 2px 4px rgba(229, 72, 77, 0.1);
}

.equation-status.error::before {
  content: "⚠️";
  margin-right: 4px;
}

.equation-status.success {
  color: var(--good);
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border: 1px solid rgba(24, 178, 107, 0.2);
  box-shadow: 0 2px 4px rgba(24, 178, 107, 0.1);
}

.equation-status.success::before {
  content: "✅";
  margin-right: 4px;
}

.equation-status.warning {
  color: var(--warn);
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  border: 1px solid rgba(255, 176, 32, 0.2);
  box-shadow: 0 2px 4px rgba(255, 176, 32, 0.1);
}

.equation-status.warning::before {
  content: "⚡";
  margin-right: 4px;
}

.variable-error {
  color: var(--danger);
  font-weight: 600;
}

.variable-valid {
  color: var(--good);
}

/* Session Multi-Selection Styles */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.checkbox-container {
  display: inline-block;
  position: relative;
  cursor: pointer;
  user-select: none;
  z-index: 10;
}

.checkbox-container input {
  position: absolute;
  opacity: 0.3;
  cursor: pointer;
  height: 16px;
  width: 16px;
  margin: 0;
  z-index: 11;
  top: 0;
  left: 0;
}

.checkmark {
  position: relative;
  height: 16px;
  width: 16px;
  background-color: var(--bg);
  border: 2px solid var(--border);
  border-radius: 3px;
  transition: all 0.2s ease;
}

.checkbox-container:hover input ~ .checkmark {
  border-color: var(--primary);
}

.checkbox-container input:checked ~ .checkmark {
  background-color: var(--primary);
  border-color: var(--primary);
}

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
  display: block;
}

.session-item {
  transition: background-color 0.2s ease;
}

.session-item:hover {
  background-color: var(--hover);
}

.session-item.selected {
  background-color: var(--primary-light);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
  line-height: 1.4;
}

/* Dataset Sidebar Styles */
.dataset-count {
  font-size: 12px;
  color: var(--muted);
  background: var(--bg-2);
  padding: 4px 8px;
  border-radius: 12px;
  font-weight: 500;
}

.dataset-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.dataset-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.dataset-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #3b82f6);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.dataset-item:hover {
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dataset-item:hover::before {
  transform: scaleX(1);
}

.dataset-info {
  flex: 1;
  min-width: 0;
}

.dataset-name {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.file-icon {
  font-size: 18px;
  flex-shrink: 0;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.dataset-name .name {
  font-weight: 700;
  color: #1e293b;
  white-space: normal;
  word-break: break-word;
  font-size: 15px;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.dataset-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: #64748b;
  margin-top: 2px;
}

.upload-date {
  font-weight: 600;
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
}

.upload-time {
  opacity: 0.8;
  font-weight: 500;
}

.dataset-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 8px;
  border-radius: 8px;
  font-size: 0;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  width: 36px;
  height: 36px;
  justify-content: center;
}

.action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.action-btn:hover::before {
  left: 100%;
}

.action-btn:hover {
  transform: translateY(-2px);
}

.action-btn.primary {
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.action-btn.primary:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.action-btn.danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.action-btn.danger:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

.empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-text {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.empty-subtext {
  font-size: 14px;
  opacity: 0.7;
}

.upload-section {
  border-top: 2px solid #e2e8f0;
  padding-top: 24px;
  margin-top: 24px;
  background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
  border-radius: 12px;
  padding: 24px;
  margin: 24px -12px -12px -12px;
}

.upload-title {
  font-size: 16px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.upload-title::before {
  content: '📁';
  font-size: 18px;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.dropzone {
  position: relative;
  display: block;
  cursor: pointer;
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

.dropzone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(147, 51, 234, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.dropzone:hover {
  border-color: var(--primary);
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.dropzone:hover::before {
  opacity: 1;
}

.dropzone.drag-over {
  border-color: var(--primary);
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.dropzone.drag-over::before {
  opacity: 1;
}

.dropzone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.dropzone-icon {
  color: var(--primary);
  opacity: 0.8;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.dropzone-icon svg {
  width: 20px;
  height: 20px;
}

.dropzone-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dropzone-main {
  font-weight: 600;
  color: #1e293b;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.dropzone-sub {
  font-size: 13px;
  color: #64748b;
  font-weight: 500;
}

.upload-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  position: relative;
  overflow: hidden;
}

.upload-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.upload-btn:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.upload-btn:hover::before {
  left: 100%;
}

.upload-progress {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.95);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 10;
  min-width: 200px;
  text-align: center;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #3b82f6);
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 14px;
  font-weight: 500;
  color: #1e293b;
}

/* Error Fix Modal Styles */
.error-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.error-modal-content {
  position: relative;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  border: 1px solid var(--border);
}

.error-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.error-modal-header h3 {
  margin: 0;
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
}

.error-modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.error-modal-close:hover {
  background: var(--border);
  color: var(--text);
}

.error-modal-body {
  padding: 24px;
}

.error-modal-message {
  margin-bottom: 20px;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 500;
}

.error-modal-message.syntax-error {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.error-modal-message.unknown-vars {
  background: linear-gradient(135deg, #fef2f2 0%, #fecaca 100%);
  color: #991b1b;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.error-modal-message.mixed-error {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.error-modal-equation {
  margin-bottom: 16px;
}

.error-modal-equation label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text);
  font-size: 14px;
}

.equation-display {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
}

.equation-display.fixed {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-color: rgba(34, 197, 94, 0.3);
  color: #166534;
}

.unknown-vars-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.unknown-var-tag {
  background: linear-gradient(135deg, #fef2f2 0%, #fecaca 100%);
  color: #991b1b;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.error-modal-footer {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  border-radius: 0 0 16px 16px;
}

.error-modal-footer .btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.error-modal-footer .btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.equation-box:focus {
  outline: 2px solid color-mix(in oklab, var(--primary) 35%, transparent);
  border-color: var(--primary);
  box-shadow: 0 8px 22px rgba(0,0,0,.08);
}
.equation-actions {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 6px;
}
.module-advanced { margin-top: 14px; }

/* tiny helper */
.hidden { display: none !important; }

/* Chat-like equation box */
.equation-wrap { margin-top: 12px; position: relative; }
.equation-box {
  min-height: 260px;
  resize: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 14.5px;
  line-height: 1.5;
  /* extra bottom padding so the floating buttons don’t overlap the text */
  padding: 14px 14px 72px 14px;
}
.equation-box:focus {
  outline: 2px solid color-mix(in oklab, var(--primary) 35%, transparent);
  border-color: var(--primary);
  box-shadow: 0 8px 22px rgba(0,0,0,.08);
}

/* Floating send area (bottom-right) - only when inside equation-wrap */
.equation-wrap .equation-send {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: flex;
  gap: 8px;
  align-items: center;
}

/* General equation-send for other contexts */
.equation-send {
  display: flex;
  gap: 8px;
  align-items: center;
}
#runBtn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Advanced controls wrapper */
.module-advanced { margin-top: 16px; }

/* Small helper */
.hidden { display: none !important; }

/* --- Modern selects (no HTML changes needed) --- */
select.input {
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;

  /* Room for the chevron */
  padding-right: 44px;

  /* Height & rounding to match buttons */
  height: 42px;
  border-radius: 10px;

  /* Custom chevron */
  background-image: url("data:image/svg+xml;utf8,\
<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'>\
<path fill='%239aa3b2' d='M7.41 8.59L12 13.17l4.59-4.58L18 10l-6 6-6-6z'/>\
</svg>");
  background-repeat: no-repeat;
  background-size: 18px 18px;
  background-position: right 12px center;
}

/* Hover / focus ring */
select.input:hover {
  border-color: color-mix(in oklab, var(--primary) 35%, var(--border));
}
select.input:focus {
  outline: 2px solid color-mix(in oklab, var(--primary) 35%, transparent);
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
}

/* Disabled */
select.input:disabled {
  opacity: .65;
  cursor: not-allowed;
}

/* Placeholder style (when the null/empty option is selected) */
select.input.is-placeholder { color: var(--muted); }

/* Optional sizes if you want variants */
select.input.select-sm { height: 36px; padding-right: 40px; border-radius: 9px; }
select.input.select-lg { height: 48px; padding-right: 48px; border-radius: 12px; }

/* Improve option readability inside the dropdown (limited styling possible) */
select.input option, select.input optgroup {
  background: var(--panel);
  color: var(--text);
}

/* Plot cards */
.plot-card .plot-container {
  width: 100%;
  min-height: 380px;
}

/* --- Modal (global) --- */
.sb-modal { position: fixed; inset: 0; z-index: 1000; }
.sb-modal__backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.55); backdrop-filter: blur(2px); }
.sb-modal__dialog {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: min(1100px, 92vw); height: min(80vh, 840px);
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow);
  overflow: hidden;
}
.sb-modal__close {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  width: 30px; height: 30px; border-radius: 8px; cursor: pointer;
}
.sb-modal__close:hover { color: var(--text); border-color: color-mix(in oklab, var(--primary) 35%, var(--border)); }
.sb-modal__frame { width: 100%; height: 100%; border: 0; background: var(--bg); }

/* Modern Modal Styles */
.modern-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: modalFadeIn 0.3s ease-out;
}

.modern-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modern-modal-content {
  position: relative;
  background: white;
  border-radius: 16px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow: hidden;
  animation: modalSlideIn 0.3s ease-out;
}

.modern-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 24px 0 24px;
  border-bottom: 1px solid #e5e7eb;
  margin-bottom: 24px;
}

.modal-title {
  display: flex;
  align-items: center;
  color: #1f2937;
}

.modal-title h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: #1f2937;
}

.modern-modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  color: #6b7280;
  transition: all 0.2s ease;
}

.modern-modal-close:hover {
  background: #f3f4f6;
  color: var(--text);
}

.modern-modal-body {
  padding: 0 24px 24px 24px;
  max-height: 60vh;
  overflow-y: auto;
}

.merge-instructions {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: 12px;
  border: 1px solid #bae6fd;
  margin-bottom: 24px;
}

.instruction-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.instruction-text h3 {
  margin: 0 0 8px 0;
  font-size: 16px;
  font-weight: 600;
  color: #1e40af;
}

.instruction-text p {
  margin: 0;
  font-size: 14px;
  color: #1e40af;
  line-height: 1.5;
}

.datasets-selection {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.dataset-card {
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  padding: 20px;
  transition: all 0.3s ease;
}

.dataset-card:hover {
  border-color: #3b82f6;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.dataset-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.dataset-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
}

.dataset-name {
  font-size: 16px;
  font-weight: 600;
  color: #1f2937;
}

.column-selector {
  position: relative;
}

.column-selector select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #d1d5db;
  border-radius: 8px;
  background: white;
  color: #1f2937;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 12px center;
  background-repeat: no-repeat;
  background-size: 16px;
  padding-right: 40px;
}

.column-selector select:hover {
  border-color: #3b82f6;
}

.column-selector select:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.merge-preview {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 20px;
}

.preview-header {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
  color: var(--text);
}

.preview-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: #1f2937;
}

.preview-content {
  color: #6b7280;
  font-size: 14px;
  line-height: 1.5;
}

.modern-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 20px 24px;
  border-top: 1px solid #e5e7eb;
  background: #f9fafb;
}

.btn-secondary, .btn-primary {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-secondary {
  background: #f3f4f6;
  color: var(--text);
  border: 1px solid #d1d5db;
}

.btn-secondary:hover {
  background: #e5e7eb;
  color: #1f2937;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: white;
  box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.3);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  background: #d1d5db;
  color: #9ca3af;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

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

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Modern Success/Error Popups */
.modern-success-popup, .modern-error-popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: popupFadeIn 0.3s ease-out;
}

.success-backdrop, .error-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(2px);
}

.success-content, .error-content {
  position: relative;
  background: white;
  border-radius: 16px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  animation: popupSlideIn 0.3s ease-out;
}

.success-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  color: white;
}

.error-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  color: white;
}

.success-text h3, .error-text h3 {
  margin: 0 0 12px 0;
  font-size: 20px;
  font-weight: 600;
  color: #1f2937;
}

.success-text p, .error-text p {
  margin: 0 0 24px 0;
  font-size: 14px;
  color: #6b7280;
  line-height: 1.5;
}

.success-actions, .error-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
}

/* User menu styles */
.user-menu {
  position: relative;
  display: inline-block;
}

.user-name {
  display: inline-block;
  padding: 8px 16px;
  background: #f3f4f6;
  border-radius: 8px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}

.user-name:hover {
  background: #e5e7eb;
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 160px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s;
}

.user-menu:hover .user-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: 12px 16px;
  color: var(--text);
  text-decoration: none;
  transition: background-color 0.2s;
}

.dropdown-item:hover {
  background: #f3f4f6;
  color: #1f2937;
}

.dropdown-item:first-child {
  border-radius: 8px 8px 0 0;
}

.dropdown-item:last-child {
  border-radius: 0 0 8px 8px;
}

/* Dark theme for user menu */
[data-theme="dark"] .user-name {
  background: #374151;
  color: #f9fafb;
}

[data-theme="dark"] .user-name:hover {
  background: #4b5563;
}

[data-theme="dark"] .user-dropdown {
  background: #1f2937;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .dropdown-item {
  color: #f9fafb;
}

[data-theme="dark"] .dropdown-item:hover {
  background: #374151;
  color: #ffffff;
}

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

@keyframes popupSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}