/* ============================================================================
   SolverForge UI — Design System Tokens
   Single source of truth for the emerald theme.
   ============================================================================ */

:root {
  /* ========================================================================
     Core Color Palette
     ======================================================================== */

  /* Emerald (Primary Brand Colors) */
  --sf-emerald-50: #ecfdf5;
  --sf-emerald-100: #d1fae5;
  --sf-emerald-200: #a7f3d0;
  --sf-emerald-300: #6ee7b7;
  --sf-emerald-400: #34d399;
  --sf-emerald-500: #10b981;
  --sf-emerald-600: #059669;
  --sf-emerald-700: #047857;
  --sf-emerald-800: #065f46;
  --sf-emerald-900: #064e3b;

  /* Grays */
  --sf-gray-50: #f9fafb;
  --sf-gray-100: #f3f4f6;
  --sf-gray-200: #e5e7eb;
  --sf-gray-300: #d1d5db;
  --sf-gray-400: #9ca3af;
  --sf-gray-500: #6b7280;
  --sf-gray-600: #4b5563;
  --sf-gray-700: #374151;
  --sf-gray-800: #1f2937;
  --sf-gray-900: #111827;

  /* Red (Error/Danger) */
  --sf-red-50: #fef2f2;
  --sf-red-100: #fee2e2;
  --sf-red-200: #fecaca;
  --sf-red-300: #fca5a5;
  --sf-red-400: #f87171;
  --sf-red-500: #ef4444;
  --sf-red-600: #dc2626;
  --sf-red-700: #b91c1c;
  --sf-red-800: #991b1b;
  --sf-red-900: #7f1d1d;

  /* Amber (Warning) */
  --sf-amber-50: #fffbeb;
  --sf-amber-100: #fef3c7;
  --sf-amber-200: #fde68a;
  --sf-amber-300: #fcd34d;
  --sf-amber-400: #fbbf24;
  --sf-amber-500: #f59e0b;
  --sf-amber-600: #d97706;
  --sf-amber-700: #b45309;
  --sf-amber-800: #92400e;
  --sf-amber-900: #78350f;

  /* Blue (Info) */
  --sf-blue-50: #eff6ff;
  --sf-blue-100: #dbeafe;
  --sf-blue-200: #bfdbfe;
  --sf-blue-300: #93c5fd;
  --sf-blue-400: #60a5fa;
  --sf-blue-500: #3b82f6;
  --sf-blue-600: #2563eb;
  --sf-blue-700: #1d4ed8;
  --sf-blue-800: #1e40af;
  --sf-blue-900: #1e3a8a;

  /* ── Project Colors (8 distinct) ── */
  --sf-project-0: var(--sf-emerald-500);
  --sf-project-0-dark: var(--sf-emerald-700);
  --sf-project-0-light: rgba(16, 185, 129, 0.15);

  --sf-project-1: #3b82f6;
  --sf-project-1-dark: #1d4ed8;
  --sf-project-1-light: rgba(59, 130, 246, 0.15);

  --sf-project-2: #8b5cf6;
  --sf-project-2-dark: #6d28d9;
  --sf-project-2-light: rgba(139, 92, 246, 0.15);

  --sf-project-3: var(--sf-amber-500);
  --sf-project-3-dark: var(--sf-amber-700);
  --sf-project-3-light: rgba(245, 158, 11, 0.15);

  --sf-project-4: #ec4899;
  --sf-project-4-dark: #be185d;
  --sf-project-4-light: rgba(236, 72, 153, 0.15);

  --sf-project-5: #06b6d4;
  --sf-project-5-dark: #0e7490;
  --sf-project-5-light: rgba(6, 182, 212, 0.15);

  --sf-project-6: #f43f5e;
  --sf-project-6-dark: #be123c;
  --sf-project-6-light: rgba(244, 63, 94, 0.15);

  --sf-project-7: #84cc16;
  --sf-project-7-dark: #4d7c0f;
  --sf-project-7-light: rgba(132, 204, 22, 0.15);

  /* ── Priority Colors ── */
  --sf-priority-high: var(--sf-red-500);
  --sf-priority-high-bg: var(--sf-red-100);
  --sf-priority-medium: var(--sf-amber-500);
  --sf-priority-medium-bg: var(--sf-amber-100);
  --sf-priority-low: #22c55e;
  --sf-priority-low-bg: #dcfce7;

  /* ── Semantic Colors ── */
  --sf-color-primary: var(--sf-emerald-500);
  --sf-color-primary-dark: var(--sf-emerald-600);
  --sf-color-primary-darker: var(--sf-emerald-700);
  --sf-color-primary-light: var(--sf-emerald-400);
  --sf-color-primary-lighter: var(--sf-emerald-300);

  --sf-color-background: #f8f9fa;
  --sf-color-surface: white;
  --sf-color-text: var(--sf-gray-900);
  --sf-color-text-secondary: var(--sf-gray-600);
  --sf-color-text-tertiary: var(--sf-gray-500);
  --sf-color-text-inverse: white;

  --sf-color-border: var(--sf-gray-200);
  --sf-color-border-light: var(--sf-gray-100);
  --sf-color-border-dark: var(--sf-gray-300);

  /* ========================================================================
     Spacing & Sizing
     ======================================================================== */
  --sf-space-0: 0;
  --sf-space-1: 0.25rem;
  --sf-space-2: 0.5rem;
  --sf-space-3: 0.75rem;
  --sf-space-4: 1rem;
  --sf-space-5: 1.25rem;
  --sf-space-6: 1.5rem;
  --sf-space-8: 2rem;
  --sf-space-10: 2.5rem;
  --sf-space-12: 3rem;
  --sf-space-16: 4rem;

  /* ── Fonts ── */
  --sf-font-body: 'Space Grotesk', sans-serif;
  --sf-font-mono: 'JetBrains Mono', monospace;

  --sf-text-xs: 0.75rem;
  --sf-text-sm: 0.875rem;
  --sf-text-base: 1rem;
  --sf-text-lg: 1.125rem;
  --sf-text-xl: 1.25rem;
  --sf-text-2xl: 1.5rem;
  --sf-text-3xl: 1.875rem;
  --sf-text-4xl: 2.25rem;

  --sf-font-normal: 400;
  --sf-font-medium: 500;
  --sf-font-semibold: 600;
  --sf-font-bold: 700;

  --sf-line-none: 1;
  --sf-line-tight: 1.25;
  --sf-line-snug: 1.375;
  --sf-line-normal: 1.5;
  --sf-line-relaxed: 1.625;

  /* ========================================================================
     Borders & Radii
     ======================================================================== */
  --sf-border-1: 1px;
  --sf-border-2: 2px;

  --sf-radius-none: 0;
  --sf-radius-sm: 5px;
  --sf-radius-base: 5px;
  --sf-radius-md: 5px;
  --sf-radius-lg: 5px;
  --sf-radius-xl: 5px;
  --sf-radius-2xl: 5px;
  --sf-radius-full: 5px;

  /* ========================================================================
     Shadows
     ======================================================================== */
  --sf-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --sf-shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --sf-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --sf-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --sf-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --sf-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --sf-shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --sf-shadow-emerald: 0 4px 12px rgba(16, 185, 129, 0.3);
  --sf-shadow-red: 0 4px 12px rgba(239, 68, 68, 0.3);

  /* ========================================================================
     Transitions
     ======================================================================== */
  --sf-duration-fast: 150ms;
  --sf-duration-base: 200ms;
  --sf-duration-slow: 300ms;
  --sf-duration-slower: 500ms;

  --sf-ease-linear: linear;
  --sf-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --sf-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --sf-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --sf-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --sf-transition-all: all var(--sf-duration-base) var(--sf-ease-in-out);
  --sf-transition-colors: color var(--sf-duration-base) var(--sf-ease-in-out),
                           background-color var(--sf-duration-base) var(--sf-ease-in-out),
                           border-color var(--sf-duration-base) var(--sf-ease-in-out);
  --sf-transition-transform: transform var(--sf-duration-base) var(--sf-ease-in-out);
  --sf-transition-shadow: box-shadow var(--sf-duration-base) var(--sf-ease-in-out);

  /* ========================================================================
     Z-Index Scale
     ======================================================================== */
  --sf-z-0: 0;
  --sf-z-10: 10;
  --sf-z-20: 20;
  --sf-z-30: 30;
  --sf-z-40: 40;
  --sf-z-50: 50;
  --sf-z-dropdown: 1000;
  --sf-z-sticky: 1020;
  --sf-z-fixed: 1030;
  --sf-z-modal-backdrop: 1040;
  --sf-z-modal: 1050;
  --sf-z-popover: 1060;
  --sf-z-tooltip: 1070;

  /* ========================================================================
     Gradients
     ======================================================================== */
  --sf-gradient-primary: linear-gradient(135deg, var(--sf-emerald-500) 0%, var(--sf-emerald-600) 100%);
  --sf-gradient-primary-reverse: linear-gradient(135deg, var(--sf-emerald-600) 0%, var(--sf-emerald-700) 100%);
  --sf-gradient-header: var(--sf-gradient-primary);
  --sf-gradient-danger: linear-gradient(135deg, var(--sf-red-500) 0%, var(--sf-red-600) 100%);
  --sf-gradient-warning: linear-gradient(135deg, var(--sf-amber-500) 0%, var(--sf-amber-600) 100%);
  --sf-gradient-surface: linear-gradient(180deg, white 0%, var(--sf-gray-50) 100%);

  /* ========================================================================
     Component Variables
     ======================================================================== */

  /* Header */
  --sf-header-bg: var(--sf-gradient-header);
  --sf-header-height: 60px;
  --sf-header-padding-x: var(--sf-space-8);

  /* Buttons */
  --sf-btn-padding-x: var(--sf-space-4);
  --sf-btn-padding-y: var(--sf-space-2);
  --sf-btn-radius: var(--sf-radius-md);
  --sf-btn-font-weight: var(--sf-font-medium);

  /* Forms */
  --sf-input-border-color: var(--sf-emerald-500);
  --sf-input-radius: var(--sf-radius-base);

  /* Cards */
  --sf-card-radius: var(--sf-radius-lg);
  --sf-card-padding: var(--sf-space-4);
  --sf-card-shadow: var(--sf-shadow-base);

  /* Modals */
  --sf-modal-radius: var(--sf-radius-xl);
  --sf-modal-shadow: var(--sf-shadow-2xl);
  --sf-modal-overlay-bg: rgba(0, 0, 0, 0.6);
  --sf-modal-header-bg: var(--sf-gradient-primary);

  /* Tables */
  --sf-table-header-bg: var(--sf-gray-100);
  --sf-table-row-hover: var(--sf-gray-50);

  /* Rows */
  --sf-row-height: 36px;
  --sf-row-padding-x: var(--sf-space-3);
  --sf-row-padding-y: var(--sf-space-2);

  /* Badges */
  --sf-badge-font-size: var(--sf-text-xs);
  --sf-badge-font-weight: var(--sf-font-semibold);
  --sf-badge-padding-x: var(--sf-space-2);
  --sf-badge-padding-y: 2px;
  --sf-badge-radius: var(--sf-radius-md);
}
/* ============================================================================
   SolverForge UI — Reset
   ============================================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
/* ============================================================================
   SolverForge UI — Typography
   Self-hosted variable-weight fonts: Space Grotesk + JetBrains Mono
   ============================================================================ */

@font-face {
  font-family: 'Space Grotesk';
  src: url('/sf/fonts/space-grotesk.woff2') format('woff2');
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('/sf/fonts/jetbrains-mono.woff2') format('woff2');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

body {
  font-family: var(--sf-font-body);
  color: var(--sf-color-text);
  line-height: var(--sf-line-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/* ============================================================================
   SolverForge UI — Layout
   ============================================================================ */

.sf-app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--sf-color-background);
}

.sf-main {
  flex: 1;
  padding: var(--sf-space-4) var(--sf-space-6);
  overflow-y: auto;
}

.sf-tab-panel {
  display: none;
}

.sf-tab-panel.active {
  display: block;
}
/* ============================================================================
   SolverForge UI — Header
   ============================================================================ */

.sf-header {
  background: var(--sf-header-bg);
  height: var(--sf-header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--sf-header-padding-x);
  gap: var(--sf-space-6);
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.4);
  position: sticky;
  top: 0;
  z-index: var(--sf-z-sticky);
  flex-shrink: 0;
}

.sf-header-logo {
  height: 44px;
  width: 44px;
  filter: brightness(0) invert(1);
}

.sf-header-brand {
  display: flex;
  flex-direction: column;
}

.sf-header-title {
  color: white;
  font-size: var(--sf-text-lg);
  font-weight: var(--sf-font-semibold);
  letter-spacing: -0.01em;
  line-height: var(--sf-line-tight);
}

.sf-header-subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--sf-text-xs);
  font-family: var(--sf-font-mono);
}

.sf-header-nav {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.sf-nav-btn {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 5px 14px;
  border-radius: var(--sf-radius-base);
  font-size: var(--sf-text-sm);
  font-family: var(--sf-font-body);
  font-weight: var(--sf-font-medium);
  cursor: pointer;
  transition: var(--sf-transition-colors);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sf-nav-btn:hover,
.sf-nav-btn.active {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
}

.sf-header-actions {
  display: flex;
  align-items: center;
  gap: var(--sf-space-2);
  margin-left: var(--sf-space-4);
}

/* Solving spinner */
.sf-solving-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: sf-spin 0.7s linear infinite;
  display: none;
}

.sf-solving-spinner.active {
  display: inline-block;
}
/* ============================================================================
   SolverForge UI — Status Bar
   ============================================================================ */

.sf-statusbar {
  background: var(--sf-gray-50);
  border-bottom: 1px solid var(--sf-gray-200);
  padding: 6px var(--sf-header-padding-x);
  display: flex;
  align-items: center;
  gap: var(--sf-space-6);
  font-family: var(--sf-font-mono);
  font-size: 12px;
  color: var(--sf-gray-400);
  flex-shrink: 0;
}

.sf-statusbar-score {
  font-weight: var(--sf-font-semibold);
}

.sf-statusbar-score.score-green { color: var(--sf-emerald-600); }
.sf-statusbar-score.score-red   { color: #e53e3e; }
.sf-statusbar-score.score-yellow { color: var(--sf-amber-400); }

.sf-statusbar-score.improved {
  animation: sf-score-flash 0.4s ease-out;
}

.sf-statusbar-constraints {
  display: flex;
  gap: 4px;
  align-items: center;
}

.sf-constraint-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sf-emerald-500);
  transition: background 0.3s;
  cursor: pointer;
}

.sf-constraint-dot.violated {
  background: var(--sf-red-500);
  animation: sf-dot-pulse 1s ease-in-out infinite;
}

.sf-constraint-dot.violated-soft {
  background: var(--sf-amber-400);
  animation: sf-dot-pulse 1s ease-in-out infinite;
}

.sf-statusbar-sep {
  color: var(--sf-gray-300);
}
/* ============================================================================
   SolverForge UI — Buttons
   Unified system: variants, sizes, shapes, states.
   ============================================================================ */

.sf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 16px;
  border: none;
  border-radius: var(--sf-radius-base);
  font-family: var(--sf-font-body);
  font-size: var(--sf-text-sm);
  font-weight: var(--sf-font-semibold);
  cursor: pointer;
  transition: var(--sf-transition-all);
  white-space: nowrap;
  line-height: 1.4;
}

.sf-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Variants ── */

.sf-btn--primary {
  background: var(--sf-emerald-700);
  color: white;
}

.sf-btn--primary:hover {
  background: var(--sf-emerald-800);
}

.sf-btn--success {
  background: white;
  color: var(--sf-emerald-700);
}

.sf-btn--success:hover {
  background: var(--sf-emerald-50);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.sf-btn--danger {
  background: var(--sf-red-600);
  color: white;
}

.sf-btn--danger:hover {
  background: var(--sf-red-700);
}

.sf-btn--default {
  background: var(--sf-gray-100);
  color: var(--sf-gray-700);
  border: 1px solid var(--sf-gray-300);
}

.sf-btn--default:hover {
  background: var(--sf-gray-200);
}

.sf-btn--ghost {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.sf-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* ── Outline Modifier ── */

.sf-btn--outline {
  background: transparent;
}

.sf-btn--outline.sf-btn--primary {
  color: var(--sf-emerald-700);
  border: 1px solid var(--sf-emerald-700);
}

.sf-btn--outline.sf-btn--primary:hover {
  background: var(--sf-emerald-50);
}

.sf-btn--outline.sf-btn--danger {
  color: var(--sf-red-600);
  border: 1px solid var(--sf-red-600);
  background: transparent;
}

.sf-btn--outline.sf-btn--danger:hover {
  background: var(--sf-red-50);
}

/* ── Sizes ── */

.sf-btn--sm {
  padding: 3px 10px;
  font-size: var(--sf-text-xs);
  gap: 4px;
}

.sf-btn--lg {
  padding: 10px 24px;
  font-size: var(--sf-text-base);
  gap: 8px;
}

/* ── Shapes ── */

.sf-btn--pill {
  border-radius: var(--sf-radius-full);
}

.sf-btn--circle {
  width: 30px;
  height: 30px;
  padding: 0;
  border-radius: var(--sf-radius-base);
}

.sf-btn--icon {
  padding: 4px 8px;
}
/* ============================================================================
   SolverForge UI — Modal
   ============================================================================ */

.sf-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--sf-modal-overlay-bg);
  backdrop-filter: blur(2px);
  z-index: var(--sf-z-modal-backdrop);
  align-items: center;
  justify-content: center;
}

.sf-modal-overlay.open {
  display: flex;
}

.sf-modal {
  background: white;
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-modal-radius);
  max-width: 680px;
  width: 95%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--sf-modal-shadow);
  animation: sf-dialog-slide-in 0.18s var(--sf-ease-out);
  position: relative;
  z-index: var(--sf-z-modal);
}

.sf-modal-header {
  background: var(--sf-modal-header-bg);
  padding: 12px 20px;
  border-radius: var(--sf-modal-radius) var(--sf-modal-radius) 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sf-modal-title {
  color: white;
  font-size: var(--sf-text-base);
  font-weight: var(--sf-font-semibold);
}

.sf-modal-close {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: white;
  width: 26px;
  height: 26px;
  border-radius: var(--sf-radius-base);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.sf-modal-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.sf-modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}

.sf-modal-footer {
  padding: 12px 24px;
  border-top: 1px solid var(--sf-gray-200);
  display: flex;
  justify-content: flex-end;
  gap: var(--sf-space-2);
}
/* ============================================================================
   SolverForge UI — Data Tables
   ============================================================================ */

.sf-table-container {
  overflow-x: auto;
  border-radius: var(--sf-radius-lg);
  border: 1px solid var(--sf-gray-200);
}

.sf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.sf-table thead tr {
  background: var(--sf-table-header-bg);
}

.sf-table th {
  padding: 9px 12px;
  text-align: left;
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  border-bottom: 1px solid var(--sf-gray-200);
}

.sf-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--sf-gray-100);
  color: var(--sf-gray-800);
  vertical-align: middle;
}

.sf-table tbody tr:last-child td {
  border-bottom: none;
}

.sf-table tbody tr:hover {
  background: var(--sf-table-row-hover);
}

.sf-table-mono {
  font-family: var(--sf-font-mono);
  font-size: 12px;
}

.sf-table-center {
  text-align: center;
}

.sf-table-name {
  font-weight: var(--sf-font-semibold);
  white-space: nowrap;
}

/* ── Overview table (constraint analysis) ── */
.sf-ov-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.sf-ov-th { padding: 7px 10px; text-align: left; font-family: var(--sf-font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: .06em; color: var(--sf-gray-500); border-bottom: 2px solid var(--sf-gray-200); }
.sf-ov-row { cursor: pointer; transition: background 0.12s; }
.sf-ov-row:hover td { background: var(--sf-gray-50); }
.sf-ov-row-violated td { background: #fef9f9; }
.sf-ov-row-violated:hover td { background: #fef2f2; }
.sf-ov-td { padding: 8px 10px; border-bottom: 1px solid var(--sf-gray-100); vertical-align: middle; }
.sf-ov-td-label { color: var(--sf-gray-800); font-weight: 500; font-family: var(--sf-font-body); }
.sf-ov-td-num { font-family: var(--sf-font-mono); font-size: 12px; color: var(--sf-gray-600); text-align: right; }
.sf-ov-td-score { font-family: var(--sf-font-mono); font-size: 12px; text-align: right; white-space: nowrap; }
.sf-ov-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.sf-ov-dot-hard { background: var(--sf-red-500); }
.sf-ov-dot-soft { background: var(--sf-amber-400); }
.sf-ov-dot-ok { background: var(--sf-emerald-400); }
.sf-ov-type { font-family: var(--sf-font-mono); font-size: 9px; padding: 2px 6px; border-radius: var(--sf-radius-base); font-weight: 700; letter-spacing: .05em; }
.sf-ov-type-hard { background: #fef2f2; color: #b91c1c; border: 1px solid #fca5a5; }
.sf-ov-type-soft { background: #fffbeb; color: #b45309; border: 1px solid #fcd34d; }
.sf-ov-score-hard { color: #b91c1c; }
.sf-ov-score-soft { color: #b45309; }
.sf-ov-score-ok { color: var(--sf-gray-400); }
/* ============================================================================
   SolverForge UI — Badges
   ============================================================================ */

.sf-badge {
  display: inline-block;
  padding: var(--sf-badge-padding-y) var(--sf-badge-padding-x);
  border-radius: var(--sf-badge-radius);
  font-size: var(--sf-badge-font-size);
  font-weight: var(--sf-badge-font-weight);
  white-space: nowrap;
}

/* Skill badge (emerald) */
.sf-badge--skill {
  background: var(--sf-emerald-50);
  color: var(--sf-emerald-700);
  border: 1px solid var(--sf-emerald-200);
}

/* Priority badges */
.sf-badge--high {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.sf-badge--medium {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

.sf-badge--low {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}

/* Type badges (hard/soft constraint) */
.sf-badge--hard {
  font-family: var(--sf-font-mono);
  font-size: 9px;
  padding: 2px 6px;
  border-radius: var(--sf-radius-base);
  font-weight: 700;
  letter-spacing: .05em;
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fca5a5;
}

.sf-badge--soft {
  font-family: var(--sf-font-mono);
  font-size: 9px;
  padding: 2px 6px;
  border-radius: var(--sf-radius-base);
  font-weight: 700;
  letter-spacing: .05em;
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fcd34d;
}

/* Process badge (colored by process) */
.sf-badge--process {
  padding: 2px 8px;
  border-radius: var(--sf-radius-base);
  border: 1px solid;
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
}
/* ============================================================================
   SolverForge UI — Cards & Panels
   ============================================================================ */

.sf-card {
  background: var(--sf-color-surface);
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-card-radius);
  padding: var(--sf-card-padding);
  box-shadow: var(--sf-card-shadow);
}

/* Summary panel */
.sf-summary-panel {
  background: white;
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-base);
  padding: var(--sf-space-4);
}

.sf-summary-title {
  font-size: 10px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sf-gray-400);
  margin-bottom: var(--sf-space-3);
}

/* KPI cards */
.sf-kpi-row {
  display: flex;
  gap: var(--sf-space-4);
  flex-wrap: wrap;
  margin-bottom: var(--sf-space-3);
}

.sf-kpi-card {
  background: var(--sf-gray-50);
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-base);
  padding: 8px 16px;
  min-width: 100px;
  text-align: center;
}

.sf-kpi-value {
  font-size: var(--sf-text-2xl);
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-bold);
  color: var(--sf-gray-900);
  line-height: 1;
}

.sf-kpi-value.danger { color: var(--sf-red-400); }
.sf-kpi-value.warn   { color: var(--sf-amber-400); }
.sf-kpi-value.ok     { color: var(--sf-emerald-400); }

.sf-kpi-label {
  font-size: 9px;
  font-family: var(--sf-font-mono);
  color: var(--sf-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 3px;
}

/* Chip */
.sf-chip {
  background: var(--sf-gray-100);
  color: var(--sf-gray-700);
  font-size: 10px;
  font-family: var(--sf-font-mono);
  padding: 2px 8px;
  border-radius: var(--sf-radius-base);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sf-chip-count {
  background: var(--sf-gray-300);
  color: var(--sf-gray-800);
  font-size: 9px;
  padding: 0 4px;
  border-radius: var(--sf-radius-base);
  font-weight: var(--sf-font-semibold);
}
/* ============================================================================
   SolverForge UI — Tooltip
   ============================================================================ */

.sf-tooltip {
  position: fixed;
  background: white;
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-lg);
  padding: 10px 14px;
  font-size: var(--sf-text-xs);
  font-family: var(--sf-font-mono);
  color: var(--sf-gray-700);
  z-index: var(--sf-z-tooltip);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  max-width: 240px;
  box-shadow: var(--sf-shadow-xl);
}

.sf-tooltip.visible {
  opacity: 1;
}

.sf-tooltip-title {
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-900);
  margin-bottom: 6px;
}

.sf-tooltip-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 2px;
  line-height: 1.4;
}

.sf-tooltip-key {
  color: var(--sf-gray-400);
  font-size: 10px;
}

.sf-tooltip-val {
  color: var(--sf-gray-700);
  font-size: 10px;
  font-weight: var(--sf-font-medium);
  text-align: right;
}
/* ============================================================================
   SolverForge UI — Footer
   ============================================================================ */

.sf-footer {
  background: var(--sf-gray-50);
  border-top: 1px solid var(--sf-gray-200);
  padding: 10px var(--sf-header-padding-x);
  display: flex;
  align-items: center;
  gap: var(--sf-space-4);
  font-size: 11px;
  color: var(--sf-gray-400);
  flex-shrink: 0;
}

.sf-footer a {
  color: var(--sf-gray-500);
  text-decoration: none;
}

.sf-footer a:hover {
  color: var(--sf-emerald-600);
}

.sf-footer .sf-vr {
  width: 1px;
  height: 12px;
  background: var(--sf-gray-200);
}
/* ============================================================================
   SolverForge UI — Custom Scrollbars
   ============================================================================ */

.sf-app ::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.sf-app ::-webkit-scrollbar-track {
  background: transparent;
}

.sf-app ::-webkit-scrollbar-thumb {
  background: var(--sf-gray-300);
  border-radius: var(--sf-radius-base);
}

.sf-app ::-webkit-scrollbar-thumb:hover {
  background: var(--sf-emerald-400);
}
/* ============================================================================
   SolverForge UI — Animations
   ============================================================================ */

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

@keyframes sf-dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes sf-score-flash {
  0% { opacity: 0.5; }
  100% { opacity: 1; }
}

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

@keyframes sf-breathe {
  0%, 100% { border-color: var(--sf-gray-300); }
  50%       { border-color: var(--sf-emerald-500); box-shadow: 0 0 12px rgba(16, 185, 129, 0.25); }
}

@keyframes sf-slide-in {
  from { opacity: 0; transform: translateY(4px) scaleY(0.8); }
  to   { opacity: 1; transform: translateY(0) scaleY(1); }
}

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

@keyframes sf-late-glow {
  0%, 100% { box-shadow: 0 0 4px rgba(239, 68, 68, 0.3); }
  50%       { box-shadow: 0 0 12px rgba(239, 68, 68, 0.7); }
}

/* Toast animations */
.sf-toast-enter {
  animation: sf-fade-in 0.2s var(--sf-ease-out);
}

.sf-toast-exit {
  animation: sf-fade-in 0.15s var(--sf-ease-in) reverse forwards;
}

/* API guide */
.sf-api-guide {
  max-width: 800px;
  padding: var(--sf-space-4) 0;
}

.sf-api-section {
  background: white;
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-base);
  padding: var(--sf-space-4);
  margin-bottom: var(--sf-space-3);
}

.sf-api-section h3 {
  font-size: var(--sf-text-sm);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-emerald-700);
  margin-bottom: var(--sf-space-2);
}

.sf-api-code-block {
  position: relative;
  background: var(--sf-gray-50);
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-base);
  padding: 10px 40px 10px 12px;
}

.sf-api-code-block code {
  font-family: var(--sf-font-mono);
  font-size: var(--sf-text-xs);
  color: var(--sf-gray-700);
  white-space: pre-wrap;
  word-break: break-all;
}

.sf-copy-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  background: var(--sf-gray-200);
  color: var(--sf-gray-600);
  border: none;
  padding: 2px 8px;
  border-radius: var(--sf-radius-base);
  font-size: 10px;
  font-family: var(--sf-font-mono);
  cursor: pointer;
  transition: var(--sf-transition-colors);
}

.sf-copy-btn:hover {
  background: var(--sf-gray-300);
  color: var(--sf-gray-800);
}

/* Toast container */
.sf-toast-container {
  position: fixed;
  top: var(--sf-space-4);
  right: var(--sf-space-4);
  z-index: var(--sf-z-tooltip);
  display: flex;
  flex-direction: column;
  gap: var(--sf-space-2);
}

.sf-toast {
  background: white;
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-lg);
  padding: 12px 16px;
  box-shadow: var(--sf-shadow-lg);
  max-width: 400px;
  font-size: var(--sf-text-sm);
  display: flex;
  gap: var(--sf-space-3);
  align-items: flex-start;
}

.sf-toast--danger {
  border-left: 3px solid var(--sf-red-500);
}

.sf-toast--success {
  border-left: 3px solid var(--sf-emerald-500);
}

.sf-toast--warning {
  border-left: 3px solid var(--sf-amber-500);
}

.sf-toast-message {
  flex: 1;
}

.sf-toast-title {
  font-weight: var(--sf-font-semibold);
  margin-bottom: 2px;
}

.sf-toast-close {
  background: none;
  border: none;
  color: var(--sf-gray-400);
  cursor: pointer;
  padding: 0;
  font-size: 16px;
  line-height: 1;
}

.sf-toast-close:hover {
  color: var(--sf-gray-700);
}

@media (prefers-reduced-motion: reduce) {
  [class^="sf-"],
  [class*=" sf-"],
  [class^="sf-"]::before,
  [class*=" sf-"]::before,
  [class^="sf-"]::after,
  [class*=" sf-"]::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
/* ============================================================================
   SolverForge UI — Timeline Rail: Resources
   Header, resource cards, gauges, stats.
   ============================================================================ */

/* ── Timeline Header (day columns) ── */
.sf-timeline-header {
  background: white;
  border: 1px solid var(--sf-gray-300);
  border-radius: var(--sf-radius-base) var(--sf-radius-base) 0 0;
  display: grid;
  height: 28px;
  overflow: hidden;
  margin-bottom: -1px;
}

.sf-timeline-label-spacer {
  border-right: 1px solid var(--sf-gray-300);
  display: flex;
  align-items: center;
  padding: 0 12px;
  font-size: 11px;
  color: var(--sf-gray-600);
  font-family: var(--sf-font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sf-timeline-days {
  display: grid;
}

.sf-timeline-day-col {
  border-right: 1px solid var(--sf-gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-700);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  gap: 6px;
}

.sf-timeline-day-col:last-child {
  border-right: none;
}

/* ── Resource Card ── */
.sf-resource-card {
  background: white;
  border: 1px solid var(--sf-gray-300);
  border-radius: var(--sf-radius-base);
  overflow: hidden;
  transition: box-shadow 0.4s ease;
  position: relative;
  box-shadow: var(--sf-shadow-sm);
}

.sf-resource-card.solving {
  animation: sf-breathe 2s ease-in-out infinite;
}

/* ── Resource Header ── */
.sf-resource-header {
  display: grid;
  border-bottom: 1px solid var(--sf-gray-300);
  background: var(--sf-gray-100);
}

.sf-resource-identity {
  padding: 8px 12px;
  border-right: 1px solid var(--sf-gray-300);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sf-resource-name {
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-900);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1;
}

.sf-resource-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-top: 2px;
}

.sf-resource-type-badge {
  font-size: 9px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.04em;
  padding: 1px 5px;
  border-radius: var(--sf-radius-base);
  text-transform: uppercase;
}

/* ── Gauge bars (temp, load, capacity) ── */
.sf-gauges {
  padding: 6px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  justify-content: center;
}

.sf-gauge-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sf-gauge-label {
  font-size: 9px;
  font-family: var(--sf-font-mono);
  color: var(--sf-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  width: 28px;
  flex-shrink: 0;
}

.sf-gauge-track {
  flex: 1;
  height: 6px;
  background: var(--sf-gray-300);
  border-radius: var(--sf-radius-base);
  overflow: hidden;
  max-width: 120px;
}

.sf-gauge-fill {
  height: 100%;
  border-radius: var(--sf-radius-base);
  transition: width 0.6s var(--sf-ease-out);
}

.sf-gauge-fill--heat {
  background: linear-gradient(90deg, #3b82f6 0%, #fbbf24 50%, #f97316 80%, #ef4444 100%);
}

.sf-gauge-fill--load {
  background: linear-gradient(90deg, var(--sf-emerald-500) 0%, #fbbf24 70%, var(--sf-red-500) 100%);
}

.sf-gauge-fill--emerald {
  background: var(--sf-emerald-500);
}

.sf-gauge-value {
  font-size: 10px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-700);
  min-width: 52px;
}

/* ── Resource Body (stats) ── */
.sf-resource-body {
  display: grid;
  min-height: 56px;
}

.sf-resource-stats {
  padding: 6px 12px;
  border-right: 1px solid var(--sf-gray-300);
  display: flex;
  flex-direction: column;
  gap: 3px;
  justify-content: center;
}

.sf-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sf-stat-label {
  font-size: 9px;
  font-family: var(--sf-font-mono);
  color: var(--sf-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sf-stat-value {
  font-size: 11px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-700);
}
/* ============================================================================
   SolverForge UI — Timeline Rail: Blocks
   Rail container, day grid, task blocks, changeover, heatmap, unassigned.
   ============================================================================ */

/* ── The Rail (where blocks live) ── */
.sf-rail-container {
  position: relative;
  overflow: hidden;
}

.sf-rail {
  position: relative;
  height: 100%;
  min-height: 56px;
  background: var(--sf-gray-50);
}

/* Day column dividers */
.sf-day-grid {
  position: absolute;
  inset: 0;
  display: grid;
  pointer-events: none;
}

.sf-day-col {
  border-right: 1px solid var(--sf-gray-200);
}

.sf-day-col:nth-child(odd) {
  background: rgba(0, 0, 0, 0.01);
}

.sf-day-col:last-child {
  border-right: none;
}

/* Hour marks */
.sf-hour-mark {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(0, 0, 0, 0.04);
  pointer-events: none;
}

/* ── Work Order / Task Blocks ── */
.sf-block {
  position: absolute;
  top: 6px;
  bottom: 6px;
  border-radius: var(--sf-radius-base);
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: filter 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 2px 5px;
  overflow: hidden;
  min-width: 20px;
  animation: sf-slide-in 0.35s var(--sf-ease-out) both;
}

.sf-block:hover {
  filter: brightness(1.25);
  transform: translateY(-1px) scaleY(1.05);
  z-index: 10;
}

.sf-block.moved {
  animation: sf-block-moved 0.6s ease-out;
}

@keyframes sf-block-moved {
  0%   { filter: brightness(2) saturate(2); transform: scaleY(1.15); }
  100% { filter: brightness(1) saturate(1); transform: scaleY(1); }
}

.sf-block.late {
  animation: sf-slide-in 0.35s var(--sf-ease-out) both, sf-late-glow 1.5s ease-in-out infinite;
}

.sf-block-label {
  font-size: 9px;
  font-family: var(--sf-font-mono);
  font-weight: var(--sf-font-semibold);
  color: rgba(0, 0, 0, 0.9);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1;
}

.sf-block-meta {
  font-size: 8px;
  font-family: var(--sf-font-mono);
  color: rgba(0, 0, 0, 0.7);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1;
  margin-top: 1px;
}

/* Changeover / gap region */
.sf-changeover {
  position: absolute;
  top: 4px;
  bottom: 4px;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(251, 191, 36, 0.08) 0px,
    rgba(251, 191, 36, 0.08) 3px,
    transparent 3px,
    transparent 9px
  );
  border-left: 1px dashed rgba(251, 191, 36, 0.3);
  border-right: 1px dashed rgba(251, 191, 36, 0.3);
  pointer-events: none;
}

/* ── Heatmap strip ── */
.sf-heatmap {
  display: grid;
  height: 10px;
  border-top: 1px solid var(--sf-gray-300);
}

.sf-heatmap-label {
  background: var(--sf-gray-100);
  border-right: 1px solid var(--sf-gray-300);
}

.sf-heatmap-track {
  position: relative;
  background: var(--sf-gray-100);
  overflow: hidden;
}

.sf-heatmap-segment {
  position: absolute;
  top: 0;
  bottom: 0;
  transition: background 0.5s ease;
}

/* ── Unassigned row ── */
.sf-unassigned-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px 8px;
  border-top: 1px solid var(--sf-gray-300);
  background: var(--sf-gray-50);
  min-height: 28px;
}

.sf-unassigned-pill {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--sf-red-400);
  font-size: 9px;
  font-family: var(--sf-font-mono);
  padding: 2px 6px;
  border-radius: var(--sf-radius-base);
  white-space: nowrap;
}
/* ============================================================================
   SolverForge UI — Gantt: Layout
   Split panes, gutter, container, grid table, grid rows.
   ============================================================================ */

/* ── Split Layout ── */
.sf-gantt-split {
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
}

.sf-gantt-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--sf-color-surface);
  border: 1px solid var(--sf-gray-200);
}

.sf-gantt-pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sf-row-padding-y) var(--sf-row-padding-x);
  background: var(--sf-gray-50);
  border-bottom: 1px solid var(--sf-gray-200);
  min-height: var(--sf-row-height);
  flex-shrink: 0;
}

.sf-gantt-pane-header h3 {
  margin: 0;
  font-size: var(--sf-text-sm);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-700);
}

.sf-gantt-pane-controls {
  display: flex;
  gap: var(--sf-space-1);
}

.sf-gantt-pane-content {
  flex: 1;
  overflow: auto;
  position: relative;
}

.sf-gantt-container {
  height: 100%;
  overflow: hidden;
}

.sf-gantt-container .gantt-container {
  cursor: grab;
  overflow: auto;
  height: 100%;
}

.sf-gantt-container .gantt-container:active {
  cursor: grabbing;
}

/* ── Split.js Gutter ── */
.sf-gantt-split > .gutter {
  background: var(--sf-gray-200);
  position: relative;
  transition: background var(--sf-duration-base);
}

.sf-gantt-split > .gutter:hover {
  background: var(--sf-emerald-400);
}

.sf-gantt-split > .gutter.gutter-horizontal {
  cursor: ns-resize;
  height: 8px;
  margin: -1px 0;
  z-index: 10;
}

.sf-gantt-split > .gutter.gutter-horizontal::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 30px;
  height: 3px;
  background: currentColor;
  opacity: 0.3;
  border-radius: var(--sf-radius-sm);
}

/* ── Grid Table ── */
.sf-gantt-grid {
  height: 100%;
  overflow: auto;
  background: linear-gradient(180deg, var(--sf-gray-50) 0%, var(--sf-gray-100) 100%);
  position: relative;
}

.sf-gantt-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--sf-text-sm);
}

.sf-gantt-table th {
  position: sticky;
  top: 0;
  background: var(--sf-gray-50);
  color: var(--sf-gray-700);
  font-size: var(--sf-text-sm);
  font-weight: var(--sf-font-semibold);
  text-align: left;
  padding: var(--sf-row-padding-y) var(--sf-row-padding-x);
  border-bottom: 2px solid var(--sf-gray-200);
  white-space: nowrap;
  z-index: 10;
}

.sf-gantt-table th.sortable {
  cursor: pointer;
  user-select: none;
  transition: background var(--sf-duration-base), color var(--sf-duration-base);
}

.sf-gantt-table th.sortable:hover {
  background: var(--sf-gray-100);
  color: var(--sf-emerald-700);
}

.sf-gantt-table th.sortable.active {
  color: var(--sf-emerald-700);
  font-weight: var(--sf-font-bold);
}

.sf-gantt-table th .sort-icon {
  margin-left: 4px;
  font-size: 10px;
  opacity: 0.45;
  transition: opacity var(--sf-duration-base);
}

.sf-gantt-table th.sortable:hover .sort-icon,
.sf-gantt-table th.sortable.active .sort-icon {
  opacity: 1;
}

.sf-gantt-table td {
  padding: var(--sf-row-padding-y) var(--sf-row-padding-x);
  border-bottom: 1px solid var(--sf-gray-200);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: var(--sf-text-sm);
  color: var(--sf-gray-700);
}

/* ── Grid Rows ── */
.sf-gantt-row {
  transition: background var(--sf-duration-fast), transform var(--sf-duration-fast),
              box-shadow var(--sf-duration-fast);
  cursor: pointer;
  position: relative;
  border-left: 4px solid transparent;
}

.sf-gantt-row:hover {
  background: var(--sf-gray-50);
  transform: translateX(2px);
  box-shadow: var(--sf-shadow-sm);
}

.sf-gantt-row.selected {
  background: var(--sf-emerald-50);
  box-shadow: var(--sf-shadow-base);
}

/* Project color accents on left border */
.sf-gantt-row.sf-project-0 { border-left-color: var(--sf-project-0); }
.sf-gantt-row.sf-project-1 { border-left-color: var(--sf-project-1); }
.sf-gantt-row.sf-project-2 { border-left-color: var(--sf-project-2); }
.sf-gantt-row.sf-project-3 { border-left-color: var(--sf-project-3); }
.sf-gantt-row.sf-project-4 { border-left-color: var(--sf-project-4); }
.sf-gantt-row.sf-project-5 { border-left-color: var(--sf-project-5); }
.sf-gantt-row.sf-project-6 { border-left-color: var(--sf-project-6); }
.sf-gantt-row.sf-project-7 { border-left-color: var(--sf-project-7); }

/* Task name sweep underline */
.sf-gantt-table .sf-task-name {
  font-weight: var(--sf-font-medium);
  color: var(--sf-gray-900);
  max-width: 300px;
  position: relative;
}

.sf-gantt-table .sf-task-name::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--sf-emerald-500);
  transition: width var(--sf-duration-slow) var(--sf-ease-out);
}

.sf-gantt-row:hover .sf-task-name::before {
  width: 100%;
}

/* ── View Mode Selector ── */
.sf-gantt-view-controls {
  display: flex;
  align-items: center;
  gap: var(--sf-space-2);
}

.sf-gantt-view-select {
  font-family: var(--sf-font-body);
  font-size: var(--sf-text-xs);
  padding: 3px 8px;
  border: 1px solid var(--sf-gray-300);
  border-radius: var(--sf-radius-base);
  background: var(--sf-color-surface);
  color: var(--sf-gray-700);
  cursor: pointer;
}

.sf-gantt-view-select:focus {
  outline: none;
  border-color: var(--sf-emerald-500);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}
/* ============================================================================
   SolverForge UI — Gantt: Bars
   Frappe Gantt bar overrides, drag UX, pinned, badges, popup.
   ============================================================================ */

/* ── Frappe Gantt Bar Overrides ── */

/* Project colors on bars */
.gantt .bar-wrapper.project-color-0 .bar { fill: var(--sf-project-0); }
.gantt .bar-wrapper.project-color-1 .bar { fill: var(--sf-project-1); }
.gantt .bar-wrapper.project-color-2 .bar { fill: var(--sf-project-2); }
.gantt .bar-wrapper.project-color-3 .bar { fill: var(--sf-project-3); }
.gantt .bar-wrapper.project-color-4 .bar { fill: var(--sf-project-4); }
.gantt .bar-wrapper.project-color-5 .bar { fill: var(--sf-project-5); }
.gantt .bar-wrapper.project-color-6 .bar { fill: var(--sf-project-6); }
.gantt .bar-wrapper.project-color-7 .bar { fill: var(--sf-project-7); }

/* Priority classes */
.gantt .bar-wrapper.priority-1 .bar { opacity: 1; }
.gantt .bar-wrapper.priority-2 .bar { opacity: 0.85; }
.gantt .bar-wrapper.priority-3 .bar { opacity: 0.7; }

/* Bar hover glow */
.gantt .bar-wrapper:hover .bar {
  filter: brightness(1.12) drop-shadow(0 2px 6px rgba(0, 0, 0, 0.22));
}

/* Grab cursor on bars */
.gantt .bar-wrapper .bar,
.gantt .bar-wrapper .bar-label,
.gantt .bar-wrapper .bar-progress {
  cursor: grab;
}

/* Resize handles */
.gantt .bar-wrapper .handle {
  cursor: ew-resize;
  fill: rgba(255, 255, 255, 0.3);
  opacity: 0;
  transition: opacity 0.15s;
}

.gantt .bar-wrapper:hover .handle {
  opacity: 1;
}

/* Bars at rest — subtle snap transition */
.gantt .bar-wrapper:not(.dragging) .bar,
.gantt .bar-wrapper:not(.dragging) .bar-progress {
  transition: x 0.12s var(--sf-ease-out),
              width 0.12s var(--sf-ease-out);
}

/* ── Pinned Task Indicators ── */
.gantt .bar-wrapper.pinned .bar {
  stroke: var(--sf-amber-500);
  stroke-width: 2;
  stroke-dasharray: 6 3;
}

/* ── Highlighted task (pulse from grid click) ── */
.gantt .bar-wrapper.highlighted .bar {
  animation: sf-gantt-pulse 0.5s ease-in-out 3;
}

@keyframes sf-gantt-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

/* ── Priority Badges (grid table) ── */
.sf-priority-badge {
  display: inline-block;
  padding: var(--sf-badge-padding-y) var(--sf-badge-padding-x);
  border-radius: var(--sf-badge-radius);
  font-size: var(--sf-badge-font-size);
  font-weight: var(--sf-badge-font-weight);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sf-priority-badge.priority-1 {
  background: var(--sf-red-100);
  color: var(--sf-red-600);
}

.sf-priority-badge.priority-2 {
  background: var(--sf-amber-100);
  color: var(--sf-amber-600);
}

.sf-priority-badge.priority-3 {
  background: var(--sf-gray-100);
  color: var(--sf-gray-500);
}

/* ── Gantt Popup ── */
.sf-gantt-popup {
  padding: 8px 12px;
  font-family: var(--sf-font-body);
  font-size: var(--sf-text-sm);
}

.sf-gantt-popup h4 {
  margin: 0 0 6px;
  font-size: var(--sf-text-sm);
  font-weight: var(--sf-font-semibold);
  color: var(--sf-gray-900);
}

.sf-gantt-popup p {
  margin: 2px 0;
  font-size: var(--sf-text-xs);
  color: var(--sf-gray-600);
  font-family: var(--sf-font-mono);
}

.sf-gantt-popup-pinned {
  color: var(--sf-amber-600);
  font-weight: var(--sf-font-semibold);
  font-size: var(--sf-text-xs);
  margin-top: 4px;
}
/* ============================================================================
   SolverForge UI — Rail Timeline
   High-level scheduling timeline with sticky lanes, viewport sync, and zoom.
   ============================================================================ */

.sf-rail-timeline {
  background:
    radial-gradient(circle at top right, rgba(16, 185, 129, 0.10), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 250, 251, 0.98));
  border: 1px solid var(--sf-gray-200);
  border-radius: var(--sf-radius-base);
  box-shadow: var(--sf-shadow-lg);
  display: grid;
  inline-size: 100%;
  min-inline-size: 0;
  overflow: hidden;
  position: relative;
}

.sf-rail-timeline-toolbar {
  align-items: center;
  background:
    linear-gradient(135deg, rgba(6, 95, 70, 0.98), rgba(4, 120, 87, 0.96)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent);
  color: white;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding: 16px 18px;
}

.sf-rail-timeline-toolbar-copy {
  display: grid;
  gap: 4px;
}

.sf-rail-timeline-toolbar-title {
  font-size: 14px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.02em;
}

.sf-rail-timeline-toolbar-subtitle {
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--sf-font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sf-rail-timeline-zoom-controls {
  display: flex;
  gap: 8px;
}

.sf-rail-timeline-zoom-button {
  appearance: none;
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--sf-radius-base);
  color: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  font-family: var(--sf-font-mono);
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.08em;
  min-width: 54px;
  padding: 7px 12px;
  text-transform: uppercase;
  transition: var(--sf-transition-all);
}

.sf-rail-timeline-zoom-button:hover,
.sf-rail-timeline-zoom-button.active {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(255, 255, 255, 0.94);
  color: var(--sf-emerald-800);
  transform: translateY(-1px);
}

.sf-rail-timeline-zoom-button:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.94);
  outline-offset: 2px;
}

.sf-rail-timeline-shell {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 250, 251, 0.98));
  display: grid;
  inline-size: 100%;
  min-inline-size: 0;
}

.sf-rail-timeline-header-viewport,
.sf-rail-timeline-body-viewport {
  cursor: grab;
  inline-size: 100%;
  min-inline-size: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sf-rail-timeline-header-viewport::-webkit-scrollbar,
.sf-rail-timeline-body-viewport::-webkit-scrollbar {
  display: none;
}

.sf-rail-timeline-header-viewport.is-dragging,
.sf-rail-timeline-body-viewport.is-dragging {
  cursor: grabbing;
}

.sf-rail-timeline-header-viewport {
  border-bottom: 1px solid var(--sf-gray-200);
  position: sticky;
  top: 0;
  z-index: var(--sf-z-sticky);
}

.sf-rail-timeline-body-viewport {
  max-height: min(72vh, 620px);
  overflow-y: auto;
}

.sf-rail-timeline-lanes {
  inline-size: var(--sf-rail-content-width);
}

.sf-rail-timeline-header-row,
.sf-rail-timeline-row {
  display: grid;
  grid-template-columns: var(--sf-rail-label-width) minmax(0, 1fr);
  inline-size: var(--sf-rail-content-width);
}

.sf-rail-timeline-row {
  border-bottom: 1px solid rgba(209, 213, 219, 0.7);
}

.sf-rail-timeline-row:last-child {
  border-bottom: none;
}

.sf-rail-timeline-label-corner,
.sf-rail-timeline-lane-label {
  backdrop-filter: blur(14px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.97), rgba(243, 244, 246, 0.96)),
    radial-gradient(circle at top left, rgba(16, 185, 129, 0.10), transparent 60%);
  border-right: 1px solid rgba(209, 213, 219, 0.92);
  left: 0;
  position: sticky;
  z-index: calc(var(--sf-z-sticky) - 1);
}

.sf-rail-timeline-label-corner {
  align-items: center;
  color: var(--sf-gray-700);
  display: flex;
  font-family: var(--sf-font-mono);
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.08em;
  min-height: 82px;
  padding: 0 18px;
  text-transform: uppercase;
}

.sf-rail-timeline-lane-label {
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  padding: 14px 16px;
}

.sf-rail-timeline-lane-heading {
  align-items: baseline;
  display: flex;
  gap: 10px;
  justify-content: space-between;
}

.sf-rail-timeline-lane-title {
  color: var(--sf-gray-900);
  font-size: 13px;
  font-weight: var(--sf-font-semibold);
  line-height: 1.1;
}

.sf-rail-timeline-lane-mode {
  color: var(--sf-gray-500);
  font-family: var(--sf-font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sf-rail-timeline-lane-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sf-rail-timeline-lane-badge {
  background: rgba(16, 185, 129, 0.10);
  border: 1px solid rgba(16, 185, 129, 0.18);
  border-radius: var(--sf-radius-base);
  color: var(--sf-emerald-800);
  font-family: var(--sf-font-mono);
  font-size: 9px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.05em;
  padding: 2px 7px;
  text-transform: uppercase;
}

.sf-rail-timeline-lane-stats {
  display: grid;
  gap: 5px;
}

.sf-rail-timeline-lane-stat {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.sf-rail-timeline-lane-stat-label {
  color: var(--sf-gray-500);
  font-family: var(--sf-font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sf-rail-timeline-lane-stat-value {
  color: var(--sf-gray-700);
  font-family: var(--sf-font-mono);
  font-size: 11px;
  font-weight: var(--sf-font-semibold);
}

.sf-rail-timeline-axis,
.sf-rail-timeline-track {
  overflow: hidden;
  position: relative;
}

.sf-rail-timeline-axis {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 250, 251, 0.98)),
    linear-gradient(90deg, rgba(16, 185, 129, 0.04), transparent 26%);
}

.sf-rail-timeline-track {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.95)),
    linear-gradient(90deg, rgba(16, 185, 129, 0.04), transparent 28%);
}

.sf-rail-timeline-day-band,
.sf-rail-timeline-weekend-band,
.sf-rail-timeline-day-divider,
.sf-rail-timeline-tick,
.sf-rail-timeline-tick-label,
.sf-rail-timeline-overlay {
  pointer-events: none;
  position: absolute;
}

.sf-rail-timeline-day-band {
  align-items: flex-start;
  border-right: 1px solid rgba(229, 231, 235, 0.9);
  bottom: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  justify-content: flex-start;
  padding: 12px 16px 26px;
  top: 0;
  z-index: 1;
}

.sf-rail-timeline-day-band:last-child {
  border-right: none;
}

.sf-rail-timeline-day-label {
  color: var(--sf-gray-900);
  font-size: 12px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.02em;
}

.sf-rail-timeline-day-sub {
  color: var(--sf-gray-500);
  font-family: var(--sf-font-mono);
  font-size: 10px;
}

.sf-rail-timeline-weekend-band {
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.02), rgba(15, 23, 42, 0.05)),
    repeating-linear-gradient(
      135deg,
      rgba(15, 23, 42, 0.03) 0px,
      rgba(15, 23, 42, 0.03) 12px,
      transparent 12px,
      transparent 24px
    );
  bottom: 0;
  top: 0;
  z-index: 0;
}

.sf-rail-timeline-day-divider {
  background: rgba(148, 163, 184, 0.32);
  bottom: 0;
  top: 0;
  width: 1px;
  z-index: 2;
}

.sf-rail-timeline-tick {
  background: rgba(148, 163, 184, 0.16);
  bottom: 0;
  top: 0;
  width: 1px;
  z-index: 2;
}

.sf-rail-timeline-tick-label {
  bottom: 8px;
  color: var(--sf-gray-400);
  font-family: var(--sf-font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  transform: translateX(8px);
  z-index: 3;
}

.sf-rail-timeline-overlay {
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  bottom: 10px;
  opacity: 0.9;
  top: 10px;
  z-index: 3;
}

.sf-rail-timeline .sf-block {
  backdrop-filter: blur(10px);
  border-left-width: 4px;
  border-radius: var(--sf-radius-base);
  box-shadow:
    0 10px 18px rgba(15, 23, 42, 0.10),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
  min-width: 28px;
  padding: 6px 8px;
  transition:
    transform var(--sf-duration-fast) var(--sf-ease-out),
    box-shadow var(--sf-duration-fast) var(--sf-ease-out),
    filter var(--sf-duration-fast) var(--sf-ease-out);
  z-index: 4;
}

.sf-rail-timeline .sf-block:hover {
  box-shadow:
    0 14px 22px rgba(15, 23, 42, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
  filter: brightness(1.03);
  transform: translateY(-1px);
}

.sf-rail-timeline .sf-block:focus-visible {
  box-shadow:
    0 0 0 3px rgba(16, 185, 129, 0.28),
    0 14px 22px rgba(15, 23, 42, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
  outline: none;
  transform: translateY(-1px);
}

.sf-rail-timeline-item--cluster {
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.02)),
    repeating-linear-gradient(
      135deg,
      rgba(15, 23, 42, 0.04) 0px,
      rgba(15, 23, 42, 0.04) 10px,
      transparent 10px,
      transparent 20px
    );
}

.sf-rail-timeline-item--detail {
  z-index: 5;
}

.sf-rail-timeline-item--overview {
  opacity: 0.94;
}

.sf-rail-timeline-item--cluster .sf-block-label,
.sf-rail-timeline-item--overview .sf-block-label {
  font-size: 11px;
}

.sf-rail-timeline-item--cluster .sf-block-meta,
.sf-rail-timeline-item--overview .sf-block-meta {
  min-height: 22px;
}

.sf-rail-timeline-summary-footer {
  display: grid;
  gap: 6px;
  margin-top: 6px;
}

.sf-rail-timeline-summary-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.sf-rail-timeline-summary-pill,
.sf-rail-timeline-detail-hint {
  align-self: flex-start;
  background: rgba(15, 23, 42, 0.10);
  border-radius: var(--sf-radius-base);
  color: inherit;
  display: inline-flex;
  font-family: var(--sf-font-mono);
  font-size: 8px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.06em;
  padding: 2px 6px;
  text-transform: uppercase;
}

.sf-rail-timeline-summary-pill--count {
  background: rgba(255, 255, 255, 0.36);
}

.sf-rail-timeline-summary-pill--open {
  background: rgba(244, 63, 94, 0.16);
}

.sf-rail-timeline-summary-pill--action,
.sf-rail-timeline-detail-hint {
  background: rgba(15, 23, 42, 0.14);
}

.sf-rail-timeline-detail-hint {
  margin-top: 4px;
}

.sf-rail-timeline-summary-tonebar {
  background: rgba(255, 255, 255, 0.18);
  border-radius: var(--sf-radius-base);
  display: flex;
  gap: 2px;
  min-height: 6px;
  overflow: hidden;
}

.sf-rail-timeline-summary-tone-segment {
  display: block;
  min-width: 8px;
}

.sf-rail-timeline .sf-block-label {
  color: inherit;
  font-size: 10px;
  font-weight: var(--sf-font-semibold);
  letter-spacing: 0.02em;
}

.sf-rail-timeline .sf-block-meta {
  color: inherit;
  font-size: 9px;
  margin-top: 3px;
  opacity: 0.78;
}

.sf-rail-timeline-tooltip {
  max-width: 280px;
}

@media (max-width: 960px) {
  .sf-rail-timeline-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .sf-rail-timeline-zoom-controls {
    flex-wrap: wrap;
  }

  .sf-rail-timeline-label-corner,
  .sf-rail-timeline-lane-label {
    padding-left: 12px;
    padding-right: 12px;
  }
}