/**
 * GeoCalc Stylesheet - rajekhan.in
 * Mobile-First, Tablet, Laptop, Desktop Responsive Design
 * Dark / Light Mode, Bilingual Devanagari & Latin Typography
 */

:root {
  /* Color Palette - Light Mode */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;

  /* Brand Colors */
  --accent-primary: #0284c7;      /* Ocean Blue */
  --accent-hover: #0369a1;
  --accent-light: #e0f2fe;
  --accent-secondary: #059669;    /* Forest Emerald */
  --accent-amber: #d97706;

  /* Status Colors */
  --status-optimal-bg: #ecfdf5;
  --status-optimal-text: #065f46;
  --status-optimal-border: #a7f3d0;
  --status-optimal-fill: #10b981;

  --status-normal-bg: #f0f9ff;
  --status-normal-text: #0369a1;
  --status-normal-border: #bae6fd;
  --status-normal-fill: #0284c7;

  --status-low-bg: #fefce8;
  --status-low-text: #854d0e;
  --status-low-border: #fef08a;
  --status-low-fill: #eab308;

  --status-high-bg: #fef2f2;
  --status-high-text: #991b1b;
  --status-high-border: #fecaca;
  --status-high-fill: #ef4444;

  --status-warning-bg: #fff1f2;
  --status-warning-text: #9f1239;
  --status-warning-border: #fecdd3;
  --status-warning-fill: #e11d48;

  /* Geometry & Shadows */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: #151e31;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --border-light: #1e293b;

  --accent-primary: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-light: rgba(56, 189, 248, 0.15);

  --status-optimal-bg: rgba(16, 185, 129, 0.15);
  --status-optimal-text: #34d399;
  --status-optimal-border: #059669;

  --status-normal-bg: rgba(56, 189, 248, 0.15);
  --status-normal-text: #7dd3fc;
  --status-normal-border: #0284c7;

  --status-low-bg: rgba(234, 179, 8, 0.15);
  --status-low-text: #facc15;
  --status-low-border: #ca8a04;

  --status-high-bg: rgba(239, 68, 68, 0.15);
  --status-high-text: #f87171;
  --status-high-border: #dc2626;

  --status-warning-bg: rgba(225, 29, 72, 0.18);
  --status-warning-text: #fb7185;
  --status-warning-border: #be123c;
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', 'Noto Sans Devanagari', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Header & Sticky Top Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-domain {
  font-size: 0.75rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 0.6rem;
  letter-spacing: -0.03em;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: 0.04em;
  margin-bottom: 1.75rem;
}

/* Search Bar */
.search-wrapper {
  position: relative;
  max-width: 720px;
  margin: 0 auto 1.5rem;
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
}

.search-input {
  width: 100%;
  padding: 1rem 1rem 1rem 3.2rem;
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-light);
}

/* Navigation Branch & Formula Dropdown Menu Grid */
.branch-nav-section {
  max-width: 960px;
  margin: 1.5rem auto 1rem;
  padding: 0 1.5rem;
}

.nav-controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.nav-dropdown-wrapper {
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.85rem 1.15rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  transition: var(--transition);
}

.nav-dropdown-wrapper:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.dropdown-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.select-container {
  position: relative;
  width: 100%;
}

.nav-dropdown-select,
.branch-dropdown-select {
  width: 100%;
  padding: 0.75rem 2.4rem 0.75rem 1rem;
  font-size: 0.96rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: var(--transition);
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.nav-dropdown-select:focus,
.branch-dropdown-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.select-arrow {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--accent-primary);
  font-size: 0.8rem;
}

@media (max-width: 768px) {
  .nav-controls-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

/* Formula Where Parameter Breakdown */
.formula-where-box {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  line-height: 1.5;
}

.formula-where-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  display: block;
}

.where-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.where-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.where-symbol {
  font-family: 'Courier New', monospace;
  font-weight: 700;
  color: var(--accent-primary);
  background-color: rgba(14, 116, 144, 0.08);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  min-width: 24px;
  text-align: center;
}

.where-desc {
  flex: 1;
}

.btn-sample-data {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: rgba(14, 116, 144, 0.08);
  color: var(--accent-primary);
  border: 1px solid rgba(14, 116, 144, 0.2);
  border-radius: var(--radius-md);
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-sample-data:hover {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

/* Stats Counter Bar */
.stats-bar {
  max-width: 1400px;
  margin: 0.5rem auto 1.5rem;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Main Content Area: Formula Cards Grid */
.main-container {
  max-width: 1400px;
  margin: 0 auto 3rem;
  padding: 0 1.5rem;
}

.formulas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  gap: 1.75rem;
}

/* Formula Card Styles */
.formula-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  overflow: hidden;
}

.formula-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

/* Card Header */
.card-header {
  padding: 1.25rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
  background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-card) 100%);
}

.card-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.branch-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--accent-light);
  color: var(--accent-primary);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

/* Card Sections */
.card-section {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-light);
}

.section-heading {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.section-content {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Formula Math Box - Transparent Background */
.section-formula {
  background-color: transparent;
  text-align: center;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border-light);
}

.math-box {
  overflow-x: auto;
  padding: 0.75rem 1rem;
  font-size: 1.15rem;
  background-color: transparent;
  border: none;
  box-shadow: none;
}

/* Inputs Form Grid */
.standard-inputs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.input-label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
}

.input-wrapper {
  display: flex;
  align-items: center;
  position: relative;
}

.form-control {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.92rem;
  font-family: inherit;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: var(--bg-card);
}

.input-unit {
  position: absolute;
  right: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  pointer-events: none;
}

.input-actions-bar {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

/* Dynamic Multi-Rows Inputs */
.dynamic-rows-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dynamic-rows-actions {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.dynamic-rows-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 220px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.dynamic-row-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.row-index {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  width: 24px;
}

.row-fields-group {
  display: flex;
  flex: 1;
  gap: 0.4rem;
}

.row-field {
  flex: 1;
}

.row-field .form-control {
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
}

.empty-rows-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  padding: 1rem;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

/* Result Box & Visual Progress Bar */
.section-result {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.result-value-display {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.result-main-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-primary);
  letter-spacing: -0.02em;
}

.result-status-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
}

.badge-optimal {
  background-color: var(--status-optimal-bg);
  color: var(--status-optimal-text);
  border-color: var(--status-optimal-border);
}

.badge-normal {
  background-color: var(--status-normal-bg);
  color: var(--status-normal-text);
  border-color: var(--status-normal-border);
}

.badge-low {
  background-color: var(--status-low-bg);
  color: var(--status-low-text);
  border-color: var(--status-low-border);
}

.badge-high {
  background-color: var(--status-high-bg);
  color: var(--status-high-text);
  border-color: var(--status-high-border);
}

.badge-warning {
  background-color: var(--status-warning-bg);
  color: var(--status-warning-text);
  border-color: var(--status-warning-border);
}

/* Progress Bar Track & Fill */
.progress-container {
  width: 100%;
}

.progress-bar-track {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  transition: width 0.4s ease-out;
  border-radius: 10px;
}

.fill-optimal { background-color: var(--status-optimal-fill); }
.fill-normal { background-color: var(--status-normal-fill); }
.fill-low { background-color: var(--status-low-fill); }
.fill-high { background-color: var(--status-high-fill); }
.fill-warning { background-color: var(--status-warning-fill); }

/* Interpretation Box */
.interpretation-box {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.interp-lang {
  font-size: 0.88rem;
  line-height: 1.5;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
}

.interp-primary {
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-primary);
}

.interp-secondary {
  background-color: var(--bg-primary);
  border-left: 3px solid var(--accent-secondary);
  color: var(--text-secondary);
  font-size: 0.82rem;
}

/* Footer / Reference */
.card-footer {
  margin-top: auto;
  padding: 0.75rem 1.25rem;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-light);
}

.reference-heading {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.reference-text {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

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

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

.btn-outline {
  background-color: transparent;
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-outline:hover {
  background-color: var(--accent-light);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--accent-primary);
  background-color: var(--bg-tertiary);
}

.btn-bookmark.bookmarked {
  color: #eab308;
}

.btn-remove-row:hover {
  color: #ef4444;
}

/* Branch Directory Banner & Grid */
.branch-dir-container {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.branch-dir-header {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.branch-dir-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.branch-dir-icon {
  font-size: 2.2rem;
  width: 56px;
  height: 56px;
  background: var(--accent-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.branch-dir-title-box {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.branch-dir-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.branch-dir-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.branch-dir-count-badge {
  background-color: var(--accent-primary);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-xl);
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
}

/* Formula Directory Cards Grid */
.formula-dir-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  width: 100%;
}

.formula-dir-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.formula-dir-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.formula-dir-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.formula-dir-card-index {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-muted);
  background-color: var(--bg-tertiary);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.formula-dir-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin: 0;
}

.formula-dir-card:hover .formula-dir-card-title {
  color: var(--accent-primary);
}

.formula-dir-card-math {
  background-color: var(--bg-primary);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  text-align: center;
  overflow-x: auto;
  border: 1px solid var(--border-light);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.formula-dir-card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.formula-dir-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-light);
}

.formula-dir-btn {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.formula-dir-card:hover .formula-dir-btn {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Single Formula View Topbar */
.single-formula-container {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.formula-view-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  background-color: var(--bg-card);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-back-to-list {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-primary);
  background-color: var(--accent-light);
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-back-to-list:hover {
  background-color: var(--accent-primary);
  color: #ffffff;
}

.formula-quick-select-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.formula-quick-select-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.formula-quick-select {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  max-width: 280px;
}

/* Pulse Animations for Button and Result Highlight */
@keyframes calcButtonPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7);
  }
  50% {
    transform: scale(0.97);
    box-shadow: 0 0 0 8px rgba(2, 132, 199, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(2, 132, 199, 0);
  }
}

.btn-active-pulse {
  animation: calcButtonPulse 0.35s ease-out;
}

@keyframes resultBoxHighlight {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    border-color: var(--border-light);
  }
  30% {
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0.25);
    border-color: var(--accent-secondary);
    background-color: var(--status-optimal-bg);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    border-color: var(--border-light);
  }
}

.result-highlight-pulse {
  animation: resultBoxHighlight 0.6s ease-out;
}

/* Site Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-domain {
  font-weight: 700;
  color: var(--accent-primary);
}

/* No Results Box */
.no-results-box {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1.5rem;
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-color);
}

.no-results-text {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .formulas-grid {
    grid-template-columns: 1fr;
  }

  .formula-dir-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 1.75rem;
  }
}

@media (max-width: 640px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .branch-tabs {
    display: none;
  }

  .mobile-branch-select {
    display: block;
  }

  .formula-view-topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .formula-quick-select {
    max-width: 100%;
    width: 100%;
  }
}

/* Print Stylesheet */
@media print {
  .site-header, .search-wrapper, .branch-nav-section, .input-actions-bar, .btn, .btn-icon, .site-footer, .formula-view-topbar {
    display: none !important;
  }

  body {
    background-color: #ffffff !important;
    color: #000000 !important;
  }

  .formula-card {
    page-break-inside: avoid;
    box-shadow: none !important;
    border: 1px solid #cccccc !important;
    margin-bottom: 1.5rem;
  }

  .formulas-grid {
    display: block !important;
  }
}