/* ==========================================================================
   RIGHT TRIANGLE CALCULATOR DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

/* --- CSS Variables & Theme Tokens --- */
:root {
  /* Colors */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  
  --secondary: #0284c7;
  --secondary-hover: #0369a1;
  --secondary-light: #f0f9ff;
  
  --dark: #0f172a;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-alt: #f1f5f9;
  
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  
  --success: #10b981;
  --success-light: #ecfdf5;
  --error: #ef4444;
  --error-light: #fef2f2;
  --warning: #f59e0b;
  
  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  
  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-body);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* 70% Width Layout Container for Content & Calculator Sections */
.container-70 {
  width: 100%;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 1200px) {
  .container-70 {
    width: 70%;
    max-width: 70%;
  }
}

.section {
  padding-top: 1.75rem;
  padding-bottom: 1.75rem;
}

.section-alt {
  background-color: transparent;
}

/* Individual Content Section Cards */
.section-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: none;
  padding: 2.5rem 2.25rem;
  transition: border-color var(--transition-normal);
}

.section-card:hover {
  box-shadow: none;
}

@media (max-width: 640px) {
  .section-card {
    padding: 1.5rem 1rem;
    border-radius: var(--radius-md);
  }
}


/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--dark);
  text-decoration: none !important;
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.brand-icon:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.brand-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.brand-icon svg {
  width: 1.35rem;
  height: 1.35rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  padding: 0.5rem 0.25rem;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-main);
}

/* Mobile Nav Drawer */
@media (max-width: 868px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .main-nav {
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-lg);
    display: none;
  }
  
  .main-nav.is-open {
    display: flex;
  }
  
  .nav-link {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bg-alt);
  }
}

/* --- Breadcrumbs --- */
.breadcrumb-wrapper {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  font-size: 0.875rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  gap: 0.5rem;
  color: var(--text-muted);
}

.breadcrumb-item a {
  color: var(--text-muted);
}

.breadcrumb-item a:hover {
  color: var(--primary);
}

.breadcrumb-separator {
  color: var(--text-light);
  font-size: 0.75rem;
}

.breadcrumb-item.active {
  color: var(--text-main);
  font-weight: 600;
}

/* --- Hero Section --- */
.hero-section {
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

@media (max-width: 640px) {
  .hero-content h1 {
    font-size: 1.85rem;
  }
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  line-height: 1.6;
}

.hero-sub {
  font-size: 0.975rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.topic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none !important;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.btn-outline {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  background-color: var(--bg-alt);
  border-color: var(--text-light);
}

.hero-visual {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.hero-visual-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  font-weight: 500;
}

/* --- Main Calculator Layout --- */
.calculator-card {
  background-color: var(--bg-card);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: var(--radius-lg);
  box-shadow: none;
  overflow: hidden;
  margin-bottom: 2.5rem;
  transition: border-color var(--transition-normal);
}

.calculator-card:hover {
  box-shadow: none;
}

/* --- Modern SaaS Calculator Section UI --- */
.calculator-card {
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #ffffff;
  box-shadow: none;
}

.calculator-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #1e3a8a 100%);
  color: #ffffff;
  padding: 1.75rem 2.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
}

.calculator-header::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 320px;
  height: 200%;
  background: radial-gradient(circle at 70% 30%, rgba(59, 130, 246, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.calc-header-content {
  max-width: 620px;
  position: relative;
  z-index: 1;
}

.calc-header-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.calc-header-badge-icon {
  width: 2.35rem;
  height: 2.35rem;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.calculator-header h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #ffffff;
  margin: 0;
  letter-spacing: -0.02em;
}

.calculator-header p {
  font-size: 0.925rem;
  color: #cbd5e1;
  line-height: 1.5;
  margin: 0;
}

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

.calc-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.775rem;
  font-weight: 700;
  color: #60a5fa;
  backdrop-filter: blur(6px);
}

.pulse-dot {
  width: 0.5rem;
  height: 0.5rem;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.calculator-body {
  padding: 2.25rem;
}

@media (max-width: 640px) {
  .calculator-header {
    padding: 1.25rem 1.5rem;
  }
  .calculator-body {
    padding: 1.25rem;
  }
}

/* Mode Selector Tabs */
.mode-selector {
  margin-bottom: 2rem;
}

.mode-selector-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.mode-step-badge {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border: 1px solid var(--primary-border);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.mode-selector-label {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--dark);
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
  background-color: #f1f5f9;
  padding: 0.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.mode-tab {
  padding: 0.75rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.mode-tab:hover {
  color: var(--dark);
  background-color: rgba(255, 255, 255, 0.7);
}

.mode-tab.active {
  background-color: #ffffff;
  color: var(--primary);
  border-color: #bfdbfe;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.12), 0 1px 2px rgba(0,0,0,0.04);
  font-weight: 800;
}

.tab-icon {
  font-size: 1rem;
  line-height: 1;
}

/* Calculator Workspace Layout Grid */
.calculator-workspace {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.75rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
  .calculator-workspace {
    grid-template-columns: 1fr;
  }
}

.calc-workspace-form {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.workspace-section-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.workspace-label {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--dark);
}

/* Form Inputs Grid */
.inputs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-group label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.input-with-unit {
  display: flex;
  align-items: center;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  background-color: #ffffff;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-with-unit:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  background-color: transparent;
  color: var(--dark);
  font-family: var(--font-mono);
  outline: none;
}

.unit-select {
  padding: 0.75rem 0.95rem;
  font-size: 0.875rem;
  font-weight: 700;
  background-color: #f1f5f9;
  border: none;
  border-left: 1px solid #e2e8f0;
  color: var(--primary-hover);
  cursor: pointer;
  outline: none;
  transition: background-color var(--transition-fast);
}

.unit-select:hover {
  background-color: #e2e8f0;
}

.field-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Custom Interactive Dropdown Component (Positions Menu Below/After Field Box) */
.custom-dropdown-container {
  position: relative;
  width: 100%;
}

.custom-dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
  font-size: 0.925rem;
  font-weight: 700;
  color: var(--dark);
  cursor: pointer;
  user-select: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.custom-dropdown-trigger:hover {
  border-color: #94a3b8;
  background-color: #f8fafc;
}

.custom-dropdown-container.is-open .custom-dropdown-trigger,
.custom-dropdown-trigger:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
  background-color: #ffffff;
  outline: none;
}

.trigger-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.select-chevron {
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.custom-dropdown-container.is-open .select-chevron {
  transform: rotate(180deg);
}

/* Menu Dropdown List (Positioned DIRECTLY BELOW / AFTER Field Box) */
.custom-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 200;
  background-color: #ffffff;
  border: 1.5px solid #bfdbfe;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.14), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  padding: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 280px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 180ms cubic-bezier(0.16, 1, 0.3, 1), transform 180ms cubic-bezier(0.16, 1, 0.3, 1), visibility 180ms;
}

.custom-dropdown-container.is-open .custom-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.custom-dropdown-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  gap: 0.75rem;
  user-select: none;
}

.custom-dropdown-option:hover {
  background-color: #eff6ff;
  color: var(--primary-hover);
}

.custom-dropdown-option.selected {
  background-color: #dbeafe;
  color: var(--primary-hover);
}

.opt-icon {
  font-size: 1.15rem;
  line-height: 1;
  flex-shrink: 0;
}

.opt-content {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
}

.opt-title {
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--dark);
}

.custom-dropdown-option:hover .opt-title,
.custom-dropdown-option.selected .opt-title {
  color: var(--primary-hover);
}

.opt-sub {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.opt-check {
  font-weight: 900;
  font-size: 0.95rem;
  color: var(--primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.custom-dropdown-option.selected .opt-check {
  opacity: 1;
}

.label-badge {
  font-size: 0.725rem;
  font-weight: 700;
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border: 1px solid var(--primary-border);
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Action Controls */
.calculator-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.5rem;
}

#calculate-btn {
  flex: 1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 800;
  padding: 0.85rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.22);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

#calculate-btn:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #1e40af 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.32);
}

#calculate-btn:active {
  transform: translateY(0);
}

#reset-btn {
  background: #ffffff;
  color: var(--text-muted);
  border: 1.5px solid #cbd5e1;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

#reset-btn:hover {
  background-color: #f1f5f9;
  color: var(--dark);
  border-color: #94a3b8;
}

/* Live Scaled Visualizer Card (Right Column) */
.calc-workspace-visual {
  background: linear-gradient(180deg, #f8fafc 0%, #edf2f7 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  min-height: 290px;
}

.visual-card-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.visual-title {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--dark);
}

.live-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  background-color: #dcfce7;
  color: #15803d;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid #bbf7d0;
}

.triangle-svg-canvas {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0.5rem 0;
}

.triangle-svg-canvas svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 4px 6px rgba(15, 23, 42, 0.06));
}

.visual-card-caption {
  font-size: 0.775rem;
  color: var(--text-muted);
  text-align: center;
}

.error-banner {
  display: none;
  padding: 1rem 1.25rem;
  background-color: var(--error-light);
  border: 1px solid #fca5a5;
  border-radius: var(--radius-md);
  color: #991b1b;
  font-size: 0.925rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.error-banner.is-visible {
  display: block;
}

/* --- Elevated Results Panel UI --- */
.results-panel {
  display: none;
  background-color: #ffffff;
  border: 2px solid var(--primary-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-top: 1.75rem;
  box-shadow: none;
  animation: fadeInResults 350ms cubic-bezier(0.16, 1, 0.3, 1);
}

.results-panel.is-visible {
  display: block;
}

@keyframes fadeInResults {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.results-header-title {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.results-icon-badge {
  width: 2.5rem;
  height: 2.5rem;
  background-color: #dcfce7;
  color: #15803d;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.results-header h3 {
  font-size: 1.35rem;
  color: var(--dark);
  font-weight: 800;
  line-height: 1.2;
  margin: 0;
}

.results-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: block;
  margin-top: 0.2rem;
  font-weight: 500;
}

.btn-copy-results {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border: 1px solid var(--primary-border);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn-copy-results:hover {
  background-color: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

.btn-copy-results:active {
  transform: translateY(0);
}

/* Results Grid Layout (3 Columns) */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.result-card-box {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--transition-fast);
}

.result-card-box:hover {
  border-color: var(--primary-border);
}

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

.card-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-header-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.result-card-title {
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--dark);
}

.card-header-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  background-color: #e2e8f0;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.result-metrics-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.result-metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  gap: 0.5rem;
}

/* Featured Hero Metric Box within card */
.metric-highlight-hero {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1.5px solid #bfdbfe;
}

.metric-highlight-hero .metric-name {
  color: var(--primary-hover);
  font-weight: 800;
}

.metric-highlight-emerald {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  border: 1.5px solid #a7f3d0;
}

.metric-highlight-emerald .metric-name {
  color: #065f46;
  font-weight: 800;
}

.metric-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.metric-value-box {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.metric-val {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--dark);
  font-family: var(--font-mono);
}

.metric-val-c {
  color: var(--primary);
  font-size: 1.15rem;
}

.metric-exact {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--secondary);
  background-color: #e0f2fe;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.right-angle-badge {
  font-size: 0.75rem;
  font-weight: 800;
  background-color: #dcfce7;
  color: #15803d;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid #bbf7d0;
}

/* Step-by-Step Solution Accordion Container */
.steps-container {
  margin-top: 1.25rem;
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.steps-summary {
  font-weight: 800;
  font-size: 1.025rem;
  color: var(--dark);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  list-style: none;
  padding: 0.25rem 0;
}

.steps-summary::-webkit-details-marker,
.steps-summary::marker {
  display: none;
}

.steps-summary-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.steps-summary-icon {
  font-size: 1.15rem;
}

.steps-summary-badge {
  font-size: 0.775rem;
  font-weight: 700;
  background-color: var(--primary-light);
  color: var(--primary-hover);
  border: 1px solid var(--primary-border);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
}

.steps-list {
  margin-top: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.step-item {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-left: none;
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
}

.step-title {
  font-size: 0.925rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 0.4rem;
}

.step-formula {
  font-size: 0.95rem;
  color: var(--secondary);
  margin-bottom: 0.35rem;
  line-height: 1.5;
  overflow-x: auto;
}

.step-calc {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: auto;
}

.katex {
  font-size: 1.05em !important;
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5rem 0;
  margin: 0.75rem 0 !important;
}

/* --- Calculator Section Mobile Responsiveness Enhancements --- */
@media (max-width: 900px) {
  .calculator-workspace {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

@media (max-width: 768px) {
  .mode-tabs {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }
  
  .mode-tab {
    width: 100%;
    padding: 0.7rem 0.85rem;
    font-size: 0.875rem;
    min-height: 44px;
    word-break: break-word;
    justify-content: flex-start;
    text-align: left;
  }
}

@media (max-width: 640px) {
  .calculator-header {
    padding: 1.25rem 1.25rem;
    gap: 0.85rem;
  }

  .calculator-header h2 {
    font-size: 1.35rem;
  }

  .calculator-header p {
    font-size: 0.875rem;
  }

  .calculator-body {
    padding: 1.25rem 1rem;
  }

  .calc-workspace-form {
    padding: 1.25rem 1rem;
  }

  .calc-workspace-visual {
    padding: 1rem;
    min-height: auto;
  }

  .results-panel {
    padding: 1.25rem 1rem;
  }

  .results-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .btn-copy-results {
    width: 100%;
    justify-content: center;
    min-height: 44px;
  }

  .results-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
  }

  .steps-container {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  .calculator-header {
    padding: 1rem 1rem;
  }

  .calc-header-title-row {
    gap: 0.5rem;
  }

  .calc-header-badge-icon {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
  }

  .calculator-header h2 {
    font-size: 1.2rem;
  }

  .mode-selector-header {
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .mode-tabs {
    grid-template-columns: 1fr;
    padding: 0.4rem;
    gap: 0.4rem;
  }

  .mode-tab {
    padding: 0.65rem 0.75rem;
    font-size: 0.85rem;
    gap: 0.4rem;
  }

  .tab-icon {
    font-size: 0.95rem;
  }

  .calculator-actions {
    flex-direction: column;
    width: 100%;
    gap: 0.65rem;
  }

  #calculate-btn, #reset-btn {
    width: 100%;
    min-height: 46px;
    padding: 0.75rem 1rem;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .result-metric-row {
    flex-wrap: wrap;
    gap: 0.4rem;
    padding: 0.6rem 0.75rem;
  }

  .metric-value-box {
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 380px) {
  .calculator-body,
  .calc-workspace-form,
  .results-panel,
  .steps-container {
    padding: 0.85rem 0.75rem;
  }

  .mode-tabs {
    grid-template-columns: 1fr;
  }

  .custom-dropdown-trigger {
    padding: 0.7rem 0.75rem;
    font-size: 0.85rem;
  }

  .custom-dropdown-option {
    padding: 0.65rem 0.65rem;
    gap: 0.5rem;
  }

  .opt-title {
    font-size: 0.825rem;
  }
}

/* --- Content Sections & Typography --- */
.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.25;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  max-width: 820px;
  line-height: 1.6;
}

.content-block {
  margin-bottom: 2.75rem;
  font-size: 1.05rem;
  line-height: 1.75;
  color: #334155;
}

.content-block h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--dark);
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.content-block h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark);
  margin-top: 1.85rem;
  margin-bottom: 0.85rem;
}

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

/* Key Takeaways & Callout Highlight Boxes */
.key-takeaways, .callout-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-left: none;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.75rem 0;
  box-shadow: var(--shadow-sm);
}

.key-takeaways h4, .callout-box h4 {
  font-size: 1.1rem;
  font-weight: 800;
  color: #0369a1;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.key-takeaways ul {
  padding-left: 1.25rem;
  margin: 0;
}

.key-takeaways li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

/* Formula & Math Display Cards */
.formula-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.formula-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.65rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.formula-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -6px rgba(15, 23, 42, 0.08);
  border-color: var(--primary-border);
}

.formula-card h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 0.6rem;
}

.formula-box {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.15rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  margin: 0.85rem 0;
  overflow-x: auto;
}

/* Clean Data Tables */
.data-table-wrapper {
  overflow-x: auto;
  margin: 1.75rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.04);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.data-table th {
  background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  color: var(--dark);
  font-weight: 800;
  padding: 0.95rem 1.25rem;
  border-bottom: 2px solid var(--border-color);
}

.data-table td {
  padding: 0.95rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

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

.data-table tr:nth-child(even) {
  background-color: #f8fafc;
}

.data-table tr:hover {
  background-color: #f1f5f9;
}

/* Worked Example Box */
.example-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: none;
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.example-box h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 0.85rem;
}

.example-step {
  margin-bottom: 0.85rem;
  padding-left: 1rem;
  border-left: none;
}

/* --- Related Calculators Cluster Cards --- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.35rem;
  margin-top: 1.75rem;
}

.calc-cluster-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.calc-cluster-card:hover {
  border-color: var(--primary-border);
  box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.12);
  transform: translateY(-3px);
}

.calc-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 0.45rem;
}

.calc-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.15rem;
  line-height: 1.5;
}

.calc-card-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap var(--transition-fast);
}

.calc-cluster-card:hover .calc-card-link {
  gap: 0.6rem;
  color: var(--primary-hover);
}

/* --- FAQ Accordion Design System --- */
.faq-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.faq-card-item {
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.faq-card-item:hover {
  border-color: var(--primary-border);
  box-shadow: none;
}

.faq-card-item[open] {
  border-color: var(--primary-border);
  box-shadow: none;
  background-color: var(--bg-card);
}

.faq-summary {
  padding: 1.1rem 1.25rem;
  font-size: 1.025rem;
  font-weight: 700;
  color: var(--dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background-color var(--transition-fast);
}

.faq-summary::-webkit-details-marker,
.faq-summary::marker {
  display: none;
}

.faq-card-item[open] .faq-summary {
  background-color: var(--primary-light);
  border-bottom: 1px solid var(--primary-border);
  color: var(--primary-hover);
}

.faq-summary-main {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex: 1;
}

.faq-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 1.65rem;
  padding: 0 0.5rem;
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  flex-shrink: 0;
}

.faq-card-item[open] .faq-badge {
  background-color: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.faq-title {
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--dark);
}

.faq-chevron {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--transition-normal), color var(--transition-fast);
}

.faq-card-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer-content {
  padding: 1.25rem 1.35rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-main);
  background-color: var(--bg-card);
}

.faq-answer-content p {
  margin: 0;
}

@media (max-width: 640px) {
  .faq-summary {
    padding: 0.95rem 1rem;
    font-size: 0.95rem;
  }
  .faq-summary-main {
    gap: 0.6rem;
  }
  .faq-badge {
    min-width: 1.85rem;
    height: 1.45rem;
    font-size: 0.75rem;
  }
}

/* --- Expert / Author Section --- */
.author-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background-color: var(--secondary-light);
  border: 1px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin: 2.5rem 0;
}

.author-badge {
  width: 3rem;
  height: 3rem;
  background-color: var(--secondary);
  color: #ffffff;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.author-details h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
}

.author-details p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Footer --- */
.site-footer {
  background-color: var(--dark);
  color: #94a3b8;
  padding-top: 3.5rem;
  padding-bottom: 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

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

@media (max-width: 540px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Content & Legal Page Utilities --- */
.legal-content-card {
  margin-bottom: 2rem;
}

.legal-content-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legal-content-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.legal-content-card p {
  font-size: 0.975rem;
  line-height: 1.7;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.legal-content-card ul, .legal-content-card ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.legal-content-card li {
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

.policy-notice-box {
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.policy-notice-box p {
  color: #1e3a8a;
  font-weight: 500;
  margin: 0;
}

.contact-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 640px) {
  .contact-form-grid {
    grid-template-columns: 1fr;
  }
}

.form-control-standard {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.975rem;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--dark);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control-standard:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

.legal-table th, .legal-table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.legal-table th {
  background-color: var(--bg-alt);
  font-weight: 700;
  color: var(--dark);
}

.footer-col h5 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #ffffff;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
}

/* --- Accessibility & Utility Classes --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }