/* Design System Variables */
:root {
  --font-inter: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-outfit: 'Outfit', var(--font-inter);

  /* Light Theme Variables */
  --bg-app: #f4f6fa;
  --bg-card: #ffffff;
  --bg-card-hover: #fcfdfe;
  --bg-input: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: #f59e0b;
  
  --primary: #f59e0b; /* Amber / Construction Orange */
  --primary-hover: #d97706;
  --primary-glow: rgba(245, 158, 11, 0.1);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.1);
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-glow: rgba(239, 68, 68, 0.1);

  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 32px rgba(15, 23, 42, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables override */
html[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-card: #121824;
  --bg-card-hover: #171f2e;
  --bg-input: #1a2333;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #1f293d;
  --border-focus: #ffb020;

  --primary: #ffb020;
  --primary-hover: #f59e0b;
  --primary-glow: rgba(255, 176, 32, 0.15);
  --success: #34d399;
  --danger: #f87171;
  --danger-hover: #ef4444;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.4);
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-inter);
}

body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  padding: 1.5rem;
  min-height: 100vh;
}

/* Base Container */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Header Styles */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--primary);
  filter: drop-shadow(0 2px 4px var(--primary-glow));
}

.logo-area h1 {
  font-family: var(--font-outfit);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--primary-glow);
  color: var(--primary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Toggle Group for units */
.toggle-group {
  display: flex;
  background-color: var(--bg-input);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.toggle-btn {
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.toggle-btn:hover {
  color: var(--text-primary);
}

.toggle-btn.active {
  background-color: var(--bg-card);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  border: 1px solid rgba(245, 158, 11, 0.1);
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-primary);
  background-color: var(--bg-input);
  border-color: var(--primary);
}

.theme-icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* Handle theme visibility icon swaps */
html[data-theme="dark"] .sun-icon { display: block; }
html[data-theme="dark"] .moon-icon { display: none; }
html[data-theme="light"] .sun-icon { display: none; }
html[data-theme="light"] .moon-icon { display: block; }

/* Grid Layout */
.calculator-grid {
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

/* Card layout components */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.card-header h3 {
  font-family: var(--font-outfit);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.info-tip, .units-display {
  font-size: 0.75rem;
  background-color: var(--bg-input);
  color: var(--text-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  font-weight: 500;
}

/* Sections titles with indicators */
.section-title {
  font-family: var(--font-outfit);
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
}

.step-num {
  background-color: var(--primary);
  color: #000;
  font-size: 0.75rem;
  font-weight: 700;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  box-shadow: 0 2px 4px var(--primary-glow);
}

/* Shape Select Grid */
.shape-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

@media (max-width: 480px) {
  .shape-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.shape-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.shape-card:hover {
  border-color: var(--text-muted);
  transform: translateY(-2px);
  background-color: var(--bg-card-hover);
}

.shape-icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.shape-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.shape-card.active {
  border-color: var(--primary);
  background-color: var(--primary-glow);
  box-shadow: 0 0 10px var(--primary-glow);
}

.shape-card.active .shape-icon, 
.shape-card.active .shape-label {
  color: var(--primary);
  font-weight: 600;
}

/* Form Styles */
.dimensions-form {
  margin-top: 1.25rem;
}

.shape-input-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.shape-input-group.hide {
  display: none;
}

.input-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-row.split {
  flex-direction: row;
  gap: 1rem;
}

.input-row.split .input-field {
  flex: 1;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-field label {
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Custom Dual / Single Input Wrappers */
.dual-inputs, .single-input {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.dual-inputs:focus-within, .single-input:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.dual-inputs input, .single-input input, .estimate-name-row input {
  flex: 1;
  background: none;
  border: none;
  padding: 0.625rem 0.75rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  width: 100%;
}

.dual-inputs input:focus, .single-input input:focus, .estimate-name-row input:focus {
  outline: none;
}

.estimate-name-row input {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.estimate-name-row input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-addon {
  display: flex;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--text-secondary);
  padding: 0 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-left: 1px solid var(--border-color);
  user-select: none;
}

html[data-theme="dark"] .input-addon {
  background-color: rgba(255, 255, 255, 0.04);
}

.input-addon-left {
  display: flex;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--text-secondary);
  padding: 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-right: 1px solid var(--border-color);
  user-select: none;
}

html[data-theme="dark"] .input-addon-left {
  background-color: rgba(255, 255, 255, 0.04);
}

.hide {
  display: none !important;
}

/* Range Container & Slider */
.label-with-hint {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hint-text {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-glow);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.range-container {
  display: flex;
  align-items: center;
  height: 2.25rem;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
  transition: transform 0.1s ease;
}

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

/* Helpers */
.border-top {
  border-top: 1px solid var(--border-color);
}
.mt-4 { margin-top: 1.5rem !important; }
.pt-3 { padding-top: 1rem !important; }
.pt-4 { padding-top: 1.5rem !important; }
.pb-2 { padding-bottom: 0.5rem !important; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  user-select: none;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #090d16;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-primary svg {
  width: 1.15rem;
  height: 1.15rem;
}

.btn-secondary {
  background-color: var(--bg-input);
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background-color: var(--border-color);
  color: var(--text-primary);
}

.btn-danger-outline {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.775rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-danger-outline:hover {
  border-color: var(--danger);
  color: var(--danger);
  background-color: var(--danger-glow);
}

.action-buttons-row {
  display: flex;
  gap: 0.75rem;
}

.action-buttons-row button {
  flex: 1;
}

/* Visualization Panel */
.svg-container {
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-input);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
  overflow: hidden;
  position: relative;
}

#visualizerSvg {
  max-width: 100%;
  max-height: 100%;
}

/* Visual shape styling */
.svg-shape {
  fill: #78716c; /* Stone grey concrete color */
  stroke: #a8a29e;
  stroke-width: 2;
  transition: all var(--transition-normal);
}

html[data-theme="dark"] .svg-shape {
  fill: #44403c;
  stroke: #78716c;
}

.svg-wireframe {
  fill: none;
  stroke: var(--primary);
  stroke-dasharray: 4;
  stroke-width: 1.5;
}

.svg-label {
  font-size: 11px;
  fill: var(--text-secondary);
  font-weight: 500;
  text-anchor: middle;
  font-family: var(--font-inter);
}

.svg-dimension-line {
  stroke: var(--text-muted);
  stroke-width: 1;
  marker-start: url(#arrow);
  marker-end: url(#arrow);
}

/* Volume summary dashboard styling */
.volume-results-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

@media (max-width: 480px) {
  .volume-results-grid {
    grid-template-columns: 1fr;
  }
}

.volume-box {
  padding: 1rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.volume-box.primary {
  background: linear-gradient(135deg, var(--bg-input) 0%, var(--primary-glow) 100%);
  border-color: rgba(245, 158, 11, 0.2);
}

.volume-label {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.volume-value-display {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin: 0.25rem 0;
}

.volume-value-display .val {
  font-family: var(--font-outfit);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.volume-box.primary .volume-value-display .val {
  color: var(--primary);
}

.volume-value-display .unit {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.volume-subtext {
  font-size: 0.725rem;
  color: var(--text-muted);
}

.other-units-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-input);
  border-radius: var(--radius-sm);
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.unit-pill {
  background-color: var(--bg-card);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

/* Bags Section */
.bags-section h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.bags-disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.bags-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

@media (max-width: 480px) {
  .bags-grid {
    grid-template-columns: 1fr;
  }
}

.bag-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: all var(--transition-fast);
}

.bag-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-muted);
}

.bag-size {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.bag-count {
  font-family: var(--font-outfit);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.bag-card.highlight .bag-count {
  color: var(--primary);
}

.bag-yield {
  font-size: 0.675rem;
  color: var(--text-muted);
}

/* Financial Card Breakdown */
.financial-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.cost-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.calc-formula {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.cost-value {
  font-weight: 600;
  color: var(--text-primary);
}

.cost-row.total {
  border-top: 1px dashed var(--border-color);
  padding-top: 0.75rem;
  margin-top: 0.25rem;
}

.cost-row.total span:first-child {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.cost-row.total .cost-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

/* History Section */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.title-with-count {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.title-with-count h3 {
  font-family: var(--font-outfit);
  font-size: 1.15rem;
  font-weight: 600;
}

.count-badge {
  background-color: var(--primary-glow);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.history-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
}

.history-empty svg {
  width: 3rem;
  height: 3rem;
  margin-bottom: 0.75rem;
  opacity: 0.6;
}

.history-empty p {
  font-size: 0.875rem;
  max-width: 400px;
}

/* History Table */
.history-table-wrapper {
  overflow-x: auto;
  margin-top: 0.5rem;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.history-table th {
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
  background-color: var(--bg-input);
}

.history-table td {
  padding: 0.875rem 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.history-table tr:hover td {
  background-color: var(--bg-card-hover);
}

.history-proj-name {
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}

.history-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-shape-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.725rem;
  font-weight: 600;
  background-color: var(--bg-input);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  text-transform: capitalize;
}

.history-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon-only {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border-color);
  background: none;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon-only:hover {
  background-color: var(--bg-input);
  color: var(--text-primary);
}

.btn-icon-only.delete:hover {
  border-color: var(--danger);
  color: var(--danger);
  background-color: var(--danger-glow);
}

.btn-icon-only svg {
  width: 1.1rem;
  height: 1.1rem;
}

/* Header navigation links */
.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin: 0 auto 0 2rem;
}

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }
  .header-nav {
    margin: 0;
    justify-content: center;
  }
  .header-controls {
    justify-content: space-between;
  }
}

.nav-link {
  font-family: var(--font-outfit);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.nav-link:hover {
  color: var(--primary);
  background-color: var(--primary-glow);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
  background-color: var(--primary-glow);
}

/* Footer styling override */
.app-footer {
  padding: 3rem 1.5rem 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-top: 2rem;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  text-align: left;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-logo h3 {
  font-family: var(--font-outfit);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.brand-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 400px;
}

.footer-col h4 {
  font-family: var(--font-outfit);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Informational Content Pages */
.content-page {
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.content-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

@media (max-width: 600px) {
  .content-card {
    padding: 1.5rem;
  }
}

.page-title {
  font-family: var(--font-outfit);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.content-body {
  color: var(--text-secondary);
  line-height: 1.7;
}

.content-body h2 {
  font-family: var(--font-outfit);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.content-body h3 {
  font-family: var(--font-outfit);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.content-body p {
  margin-bottom: 1.25rem;
}

.content-body ul, .content-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.content-body li {
  margin-bottom: 0.5rem;
}

.content-body strong {
  color: var(--text-primary);
}

/* Contact Page Form styling */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-control {
  font-family: var(--font-inter);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  width: 100%;
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.info-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.info-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.info-icon {
  width: 2rem;
  height: 2rem;
  color: var(--primary);
}

.info-card h4 {
  font-family: var(--font-outfit);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.info-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Success Message Container */
.alert-success {
  background-color: var(--success-glow);
  border: 1px solid var(--success);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  animation: fadeIn 0.3s ease;
}

.alert-success svg {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--success);
  flex-shrink: 0;
}

.alert-success div h4 {
  font-family: var(--font-outfit);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.alert-success div p {
  font-size: 0.875rem;
  margin: 0;
  color: var(--text-secondary);
}

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

/* Feedback Modal Overlay & Popup styling */
.feedback-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(9, 13, 22, 0.75); /* Sleek glass backdrop */
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.feedback-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.feedback-modal {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.95);
  transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

.feedback-overlay.active .feedback-modal {
  transform: translateY(0) scale(1);
}

.feedback-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feedback-close-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-input);
}

.feedback-close-btn svg {
  width: 1.25rem;
  height: 1.25rem;
}

.feedback-title {
  font-family: var(--font-outfit);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  text-align: center;
}

.feedback-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

/* Star Rating component */
.star-rating-container {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.star-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.star-btn svg {
  width: 2.25rem;
  height: 2.25rem;
  fill: currentColor;
  stroke: currentColor;
  stroke-width: 1.5;
  transition: filter var(--transition-fast);
}

.star-btn:hover {
  transform: scale(1.15);
  color: var(--primary-hover);
}

.star-btn.selected {
  color: var(--primary);
  filter: drop-shadow(0 0 4px var(--primary-glow));
}

.feedback-comment-wrapper {
  margin-bottom: 1.5rem;
}

.feedback-comment-wrapper textarea {
  min-height: 90px;
  resize: none;
}

.feedback-actions {
  display: flex;
  gap: 0.75rem;
}

.feedback-actions button {
  flex: 1;
}

/* Modal Success State Animation */
.feedback-success-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem 0;
  animation: modalScaleIn 0.3s ease;
}

.feedback-success-icon {
  width: 3.5rem;
  height: 3.5rem;
  color: var(--success);
  margin-bottom: 1.25rem;
  filter: drop-shadow(0 4px 8px var(--success-glow));
}

@keyframes modalScaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

/* Mobile Friendly Layout Optimizations */
@media (max-width: 480px) {
  body {
    padding: 0.75rem;
  }
  
  .app-container {
    gap: 1rem;
  }
  
  .app-header {
    padding: 0.75rem 1rem;
  }
  
  .toggle-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.775rem;
  }
  
  .header-nav {
    gap: 0.75rem;
    margin-top: 0.25rem;
  }
  
  .nav-link {
    font-size: 0.85rem;
    padding: 0.15rem 0.35rem;
  }
  
  .card {
    padding: 1rem;
    border-radius: var(--radius-md);
  }
  
  .input-row.split {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .action-buttons-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  #saveEstimateBtn, #resetBtn {
    flex: 1;
  }
  
  .volume-value-display .val {
    font-size: 1.5rem;
  }
  
  .history-table th, .history-table td {
    padding: 0.6rem 0.5rem;
    font-size: 0.775rem;
  }
  
  .history-shape-tag {
    font-size: 0.675rem;
    padding: 0.1rem 0.3rem;
  }
  
  .btn-icon-only {
    width: 1.75rem;
    height: 1.75rem;
  }
  
  .feedback-modal {
    padding: 1.5rem;
    width: 92%;
  }
  
  .feedback-title {
    font-size: 1.25rem;
  }
  
  .star-btn svg {
    width: 1.75rem;
    height: 1.75rem;
  }
  
  .content-card {
    padding: 1.5rem 1rem;
  }
  
  .page-title {
    font-size: 1.85rem;
  }
}

/* Print Styling */
@media print {
  body {
    background: white !important;
    color: black !important;
    padding: 0 !important;
  }
  
  .app-container {
    gap: 1rem !important;
  }

  .app-header, 
  .theme-toggle, 
  .toggle-group,
  .btn-danger-outline,
  .history-actions,
  .app-footer,
  #clearHistoryBtn,
  .action-buttons-row,
  .no-print,
  .actions-card {
    display: none !important;
  }

  .calculator-grid {
    grid-template-columns: 1fr !important;
  }

  .card {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    background: transparent !important;
  }

  .results-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .volume-box {
    border: 1px solid #ccc !important;
    background: #f9f9f9 !important;
  }

  .volume-box.primary {
    background: #f0f0f0 !important;
    border: 2px solid #333 !important;
  }

  .volume-box.primary .val {
    color: black !important;
  }

  .cost-row.total .cost-value {
    color: black !important;
    font-size: 1.25rem !important;
  }

  .history-panel {
    display: block !important;
    margin-top: 2rem !important;
  }

  .history-table th {
    background-color: #f0f0f0 !important;
    color: black !important;
    border-bottom: 2px solid #ccc !important;
  }

  .history-table td {
    border-bottom: 1px solid #ccc !important;
  }
}