/* ===================================================================
   FitCalc - Health & Fitness Calculator Styles
   Modern, Responsive, Accessible Design with Dark/Light Mode
   =================================================================== */

/* CSS Custom Properties (Variables) */
:root {
  /* Light Mode Colors */
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --accent-color: #10b981;
  --accent-hover: #059669;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  
  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* Border Colors */
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-dark: #94a3b8;
  
  /* Status Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Layout */
  --container-max-width: 1200px;
  --navbar-height: 70px;
  --sidebar-width: 280px;
}

/* Dark Mode Colors */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-input: #334155;
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --border-light: #334155;
  --border-medium: #475569;
  --border-dark: #64748b;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

/* ===================================================================
   Base Styles & Reset
   =================================================================== */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-md) 0;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-secondary);
}

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

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

ul, ol {
  margin: 0 0 var(--spacing-md) 0;
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
}

img {
  max-width: 100%;
  height: auto;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===================================================================
   Layout Components
   =================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* ===================================================================
   Navigation
   =================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.nav-brand .brand-link {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  width: 24px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.hamburger {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  margin: 2px 0;
  transition: all var(--transition-fast);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.theme-toggle {
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  transition: all var(--transition-fast);
  margin-left: var(--spacing-md);
}

.theme-toggle:hover {
  background-color: var(--border-medium);
}

.theme-icon {
  font-size: var(--font-size-lg);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    width: 100%;
    text-align: left;
  }
  
  .theme-toggle {
    margin-left: 0;
    align-self: flex-start;
  }
}

/* ===================================================================
   Hero Section
   =================================================================== */

.hero {
  padding: calc(var(--navbar-height) + var(--spacing-3xl)) 0 var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .hero-container {
    grid-template-columns: 2fr 1fr;
  }
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* ===================================================================
   Buttons
   =================================================================== */

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
}

.cta-button.primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.cta-button.primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cta-button.secondary {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.cta-button.secondary:hover {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  text-decoration: none;
  transform: translateY(-2px);
}

.cta-button.large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.calc-button {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

.calc-button:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.calc-button.secondary {
  background-color: var(--secondary-color);
}

.calc-button.secondary:hover {
  background-color: var(--border-dark);
}

/* ===================================================================
   Page Header
   =================================================================== */

.page-header {
  padding: calc(var(--navbar-height) + var(--spacing-xl)) 0 var(--spacing-xl) 0;
  background-color: var(--bg-secondary);
  text-align: center;
  border-bottom: 1px solid var(--border-light);
}

.page-header h1 {
  margin-bottom: var(--spacing-md);
}

.page-header p {
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto var(--spacing-sm) auto;
}

.last-updated {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-style: italic;
}

/* ===================================================================
   Sections
   =================================================================== */

section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  margin-top: var(--spacing-sm);
}

/* ===================================================================
   Cards & Grids
   =================================================================== */

.steps-grid,
.features-grid,
.tools-grid,
.audience-grid,
.examples-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 640px) {
  .steps-grid,
  .audience-grid,
  .examples-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .features-grid,
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .steps-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid,
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .audience-grid,
  .examples-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-card,
.feature-card,
.tool-card,
.audience-card,
.example-card {
  background-color: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.step-card:hover,
.feature-card:hover,
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.feature-icon,
.tool-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  display: block;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  color: var(--primary-color);
  font-weight: 600;
  margin-top: var(--spacing-md);
  transition: all var(--transition-fast);
}

.tool-link:hover {
  color: var(--primary-hover);
  transform: translateX(4px);
}

/* ===================================================================
   Calculator Sections
   =================================================================== */

.calculators-main {
  padding-top: calc(var(--navbar-height) + var(--spacing-md));
}

.calc-nav {
  position: sticky;
  top: var(--navbar-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  padding: var(--spacing-md) 0;
}

.calc-nav-scroll {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}

.calc-nav-scroll::-webkit-scrollbar {
  height: 4px;
}

.calc-nav-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.calc-nav-scroll::-webkit-scrollbar-thumb {
  background-color: var(--border-medium);
  border-radius: var(--radius-sm);
}

.calc-nav-link {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

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

.calculator-section {
  padding: var(--spacing-3xl) 0;
  border-bottom: 1px solid var(--border-light);
}

.calculator-section:last-child {
  border-bottom: none;
}

.calc-header {
  margin-bottom: var(--spacing-xl);
}

.calc-header h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.calc-header p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

.calc-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  background-color: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

@media (min-width: 768px) {
  .calc-container {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===================================================================
   Forms
   =================================================================== */

.calc-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.unit-toggle {
  display: flex;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.unit-btn {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.unit-btn.active {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

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

label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.input-with-unit {
  display: flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.input-with-unit:focus-within {
  border-color: var(--primary-color);
}

.input-with-unit input {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--text-primary);
}

.input-with-unit input:focus {
  outline: none;
}

.unit-label {
  padding: var(--spacing-md);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  min-width: 50px;
  text-align: center;
}

input[type="number"],
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="time"],
select,
textarea {
  padding: var(--spacing-md);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

select {
  cursor: pointer;
}

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

/* ===================================================================
   Calculator Results
   =================================================================== */

.calc-result {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-light);
}

.result-section {
  margin-bottom: var(--spacing-lg);
}

.result-section:last-child {
  margin-bottom: 0;
}

.result-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.result-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.result-category {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.result-category.normal {
  background-color: var(--success);
  color: white;
}

.result-category.overweight {
  background-color: var(--warning);
  color: white;
}

.result-category.obese {
  background-color: var(--error);
  color: white;
}

.result-category.underweight {
  background-color: var(--info);
  color: white;
}

.result-explanation {
  color: var(--text-secondary);
  line-height: 1.6;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 640px) {
  .result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .result-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  text-align: center;
}

.result-card h4 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.result-card .value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
}

/* ===================================================================
   Sliders & Range Inputs
   =================================================================== */

.macro-sliders {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background-color: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.slider-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
}

/* ===================================================================
   Fasting Timer
   =================================================================== */

.fast-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.fasting-timer {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-light);
  text-align: center;
}

.timer-display {
  margin-bottom: var(--spacing-xl);
}

.time-remaining {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--primary-color);
  font-family: 'Courier New', monospace;
  margin-bottom: var(--spacing-md);
}

.timer-status {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  font-weight: 500;
}

.fasting-timeline {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-light);
}

/* ===================================================================
   Contact Form (Table Style)
   =================================================================== */

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

@media (min-width: 1024px) {
  .contact-content {
    grid-template-columns: 1fr 2fr;
  }
}

.contact-info h2 {
  margin-bottom: var(--spacing-lg);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-method {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.method-icon {
  font-size: var(--font-size-2xl);
  flex-shrink: 0;
}

.method-info h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.method-info p {
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
}

.contact-form {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.form-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: var(--spacing-md);
}

.form-cell {
  vertical-align: top;
  padding: var(--spacing-sm);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.required {
  color: var(--error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.message-cell {
  padding-top: var(--spacing-md);
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.form-checkbox {
  margin-top: var(--spacing-xs);
  flex-shrink: 0;
}

.checkbox-label {
  font-weight: normal;
  color: var(--text-secondary);
  line-height: 1.5;
  cursor: pointer;
}

.submit-cell {
  text-align: center;
  padding-top: var(--spacing-lg);
}

.submit-button {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  padding: var(--spacing-md) var(--spacing-2xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  min-width: 160px;
}

.submit-button:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.button-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.form-note {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.error-message {
  color: var(--error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: block;
}

@media (max-width: 768px) {
  .form-table,
  .form-table tbody,
  .form-table tr {
    display: block;
  }
  
  .form-cell {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) 0;
  }
  
  .form-table tr:first-child .form-cell {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

/* ===================================================================
   Modal
   =================================================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-md);
}

.modal-content {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-md) var(--spacing-xl);
  border-bottom: 1px solid var(--border-light);
}

.modal-header h2 {
  margin: 0;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-xl);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  flex-wrap: wrap;
}

.modal-button {
  flex: 1;
  min-width: 120px;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.modal-button.primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.modal-button.primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}

.modal-button.secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-button.secondary:hover {
  background-color: var(--border-medium);
  text-decoration: none;
}

/* ===================================================================
   FAQ Section
   =================================================================== */

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  background-color: var(--bg-card);
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
}

.faq-question:hover {
  background-color: var(--bg-tertiary);
}

.faq-icon {
  font-size: var(--font-size-xl);
  color: var(--primary-color);
  transition: transform var(--transition-fast);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-answer.active {
  padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
  max-height: 300px;
}

/* ===================================================================
   Additional Info Grids
   =================================================================== */

.additional-info {
  margin-top: var(--spacing-3xl);
}

.info-grid,
.approach-grid,
.values-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 640px) {
  .info-grid,
  .approach-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .values-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.info-card,
.approach-card,
.value-item {
  background-color: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
}

.info-card:hover,
.approach-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.info-card h3,
.approach-card h3,
.value-item h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

/* ===================================================================
   Privacy & Disclaimer Specific Styles
   =================================================================== */

.privacy-content,
.disclaimer-content {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-section,
.disclaimer-section {
  margin-bottom: var(--spacing-3xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-light);
}

.privacy-section:last-child,
.disclaimer-section:last-child {
  border-bottom: none;
}

.privacy-section h2,
.disclaimer-section h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.privacy-section h3,
.disclaimer-section h3 {
  color: var(--text-primary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.important-notice {
  display: flex;
  gap: var(--spacing-md);
  background-color: var(--bg-secondary);
  border: 2px solid var(--warning);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.notice-icon {
  font-size: var(--font-size-3xl);
  flex-shrink: 0;
}

.notice-content h2 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.privacy-summary,
.disclaimer-summary {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
  border: 1px solid var(--border-light);
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .summary-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.summary-item {
  text-align: center;
}

.summary-icon {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.summary-item h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.summary-item p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ===================================================================
   About Page Specific Styles
   =================================================================== */

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.content-section {
  margin-bottom: var(--spacing-3xl);
}

.content-section h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.cta-section {
  text-align: center;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-3xl);
  margin-top: var(--spacing-3xl);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-xl);
}

/* ===================================================================
   Footer
   =================================================================== */

.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-3xl) 0 var(--spacing-xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 640px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.footer-section h3,
.footer-section h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.footer-section p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-color);
  text-decoration: none;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  transform: translateY(-2px);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-light);
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* ===================================================================
   Utility Classes
   =================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

/* ===================================================================
   Responsive Design Adjustments
   =================================================================== */

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .cta-button {
    width: 100%;
    justify-content: center;
  }
  
  .calc-container {
    padding: var(--spacing-md);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* ===================================================================
   Print Styles
   =================================================================== */

@media print {
  .navbar,
  .nav-toggle,
  .theme-toggle,
  .footer,
  .cta-button,
  .calc-button,
  .modal-overlay {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .hero,
  .page-header,
  .calc-container,
  .calculator-section {
    background: white !important;
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
  
  a {
    color: black !important;
    text-decoration: underline !important;
  }
}

/* ===================================================================
   Accessibility Improvements
   =================================================================== */

/* Focus styles for keyboard navigation */
*:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--text-inverse);
  padding: 8px;
  text-decoration: none;
  z-index: 1000;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 6px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-light: #000000;
    --border-medium: #000000;
    --border-dark: #000000;
  }
  
  [data-theme="dark"] {
    --border-light: #ffffff;
    --border-medium: #ffffff;
    --border-dark: #ffffff;
  }
}

/* ===================================================================
   Loading States
   =================================================================== */

.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

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

/* ===================================================================
   Error States
   =================================================================== */

.error-state {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
}

.success-state {
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  color: var(--success);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
}

/* ===================================================================
   End of Styles
   =================================================================== */