:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59,130,246,0.08);
  --primary-shadow: rgba(59,130,246,0.3);
  --bg-start: #f7fafc;
  --bg-end: #e9edf2;
  --card-bg: rgba(255,255,255,0.85);
  --border-color: #d0d8e2;
  --text-primary: #0b1a33;
  --text-secondary: #4a5a72;
  --text-muted: #64748b;
  --card-border: #e2e8f0;
  --status-bg: #f8fafc;
  --status-border: #e2e8f0;
}

[data-theme="dark"] {
  --bg-start: #1a1a2e;
  --bg-end: #16213e;
  --card-bg: rgba(30,30,50,0.9);
  --border-color: #334155;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --card-border: #334155;
  --status-bg: #1e293b;
  --status-border: #334155;
}

[data-theme="red"] {
  --primary: #ef4444;
  --primary-hover: #dc2626;
  --primary-light: rgba(239,68,68,0.08);
  --primary-shadow: rgba(239,68,68,0.3);
}
[data-theme="pink"] {
  --primary: #ec4899;
  --primary-hover: #db2777;
  --primary-light: rgba(236,72,153,0.08);
  --primary-shadow: rgba(236,72,153,0.3);
}
[data-theme="orange"] {
  --primary: #f97316;
  --primary-hover: #ea580c;
  --primary-light: rgba(249,115,22,0.08);
  --primary-shadow: rgba(249,115,22,0.3);
}
[data-theme="purple"] {
  --primary: #8b5cf6;
  --primary-hover: #7c3aed;
  --primary-light: rgba(139,92,246,0.08);
  --primary-shadow: rgba(139,92,246,0.3);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
  background: linear-gradient(145deg, var(--bg-start) 0%, var(--bg-end) 100%);
  min-height: 100vh;
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background 0.3s, color 0.3s;
}
.app-container {
  max-width: 1100px;
  width: 100%;
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 32px;
  padding: 20px 18px 30px;
  box-shadow: 0 20px 40px -8px rgba(0,0,0,0.12), 0 0 0 1px rgba(255,255,255,0.2);
  transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
}
h1 {
  font-weight: 600;
  font-size: 1.8rem;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.subtitle {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 0.95rem;
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  border-radius: 0 12px 12px 0;
  line-height: 1.5;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  position: relative;
}
.btn-group, .settings-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.btn {
  background: white;
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 40px;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
  background: var(--card-bg);
  backdrop-filter: blur(4px);
  white-space: nowrap;
}
.btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--primary-shadow);
}
.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 4px 12px var(--primary-shadow);
}
.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: white;
}
.btn-secondary {
  background: #f1f5f9;
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: #e2e8f0;
}
.btn-danger {
  border-color: #f87171;
  color: #b91c1c;
}
.btn-danger:hover {
  background: #fee2e2;
  border-color: #ef4444;
}
.btn-settings {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  padding: 4px 8px;
}
.btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}
.settings-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 16px 20px;
  min-width: 200px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
  z-index: 10;
}
.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-primary);
}
.setting-item label {
  cursor: pointer;
}
.setting-item select {
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-primary);
}
.column-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
  max-height: 420px;
  overflow-y: auto;
  padding-right: 4px;
}
.column-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(4px);
  padding: 10px 14px;
  border-radius: 40px;
  border: 1px solid var(--border-color);
  transition: background 0.15s, border-color 0.15s;
}
[data-theme="dark"] .column-row {
  background: rgba(255,255,255,0.06);
}
.column-row:hover {
  background: white;
  border-color: var(--primary);
}
[data-theme="dark"] .column-row:hover {
  background: rgba(255,255,255,0.12);
}
.column-row input, .column-row select {
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--border-color);
  padding: 5px 4px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-primary);
  min-width: 70px;
  transition: border 0.15s;
  outline: none;
}
.column-row input:focus, .column-row select:focus {
  border-bottom-color: var(--primary);
}
.column-row .col-name {
  flex: 1 1 100px;
  min-width: 70px;
}
.column-row .col-type {
  flex: 0 0 110px;
}
.column-row .col-value {
  flex: 2 1 120px;
  min-width: 80px;
}
.column-row .col-value input {
  width: 100%;
}
.column-row .col-value input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.column-row .col-mean {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}
.column-row .col-mean input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin: 0;
  cursor: pointer;
}
.column-row .col-delete {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #94a3b8;
  cursor: pointer;
  padding: 0 6px;
  transition: color 0.15s;
}
.column-row .col-delete:hover {
  color: #ef4444;
}
.column-row .col-index {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.8rem;
  min-width: 28px;
}
.status-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 10px 0 20px;
  padding: 10px 16px;
  background: var(--status-bg);
  border-radius: 60px;
  border: 1px solid var(--status-border);
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.status-bar .count {
  font-weight: 600;
  color: var(--text-primary);
}
.result-card {
  margin-top: 20px;
  padding: 24px 28px;
  background: var(--card-bg);
  border-radius: 32px;
  border: 1px solid var(--card-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
  display: none;
}
.result-card.show {
  display: block;
  animation: fadeSlide 0.3s ease;
}
@keyframes fadeSlide {
  0% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 1; transform: translateY(0); }
}
.result-prediction {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-primary);
}
.result-confidence {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 4px;
}
.result-probs {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
}
.result-probs .prob-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}
.result-probs .prob-bar {
  width: 160px;
  height: 8px;
  background: var(--border-color);
  border-radius: 20px;
  overflow: hidden;
}
.result-probs .prob-bar .fill {
  height: 100%;
  border-radius: 20px;
  background: var(--primary);
  transition: width 0.4s;
}
.result-data-quality {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.error-message {
  color: #b91c1c;
  background: #fee2e2;
  padding: 12px 20px;
  border-radius: 40px;
  display: none;
}
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-right: 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.footer {
  margin-top: 30px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}
@media (max-width: 680px) {
  .app-container { padding: 16px; }
  .column-row { border-radius: 20px; padding: 10px 12px; flex-wrap: wrap; }
  .column-row .col-name, .column-row .col-type, .column-row .col-value, .column-row .col-mean {
    flex: 1 1 100%;
  }
  .column-row .col-value input { width: 100%; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .btn-group, .settings-group { justify-content: center; }
  .btn { justify-content: center; }
  .result-probs .prob-bar { width: 100px; }
  .settings-dropdown {
    left: 0;
    right: auto;
    width: 100%;
  }
}