/* Root Variables */
:root {
  --primary-color: #FF6B6B;
  --secondary-color: #4ECDC4;
  --accent-color: #FFE66D;
  --dark-bg: #1A1A2E;
  --light-bg: #FFFFFF;
  --text-dark: #2C3E50;
  --text-light: #ECF0F1;
  --border-color: #E0E0E0;
  --shadow: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --bg-primary: #1A1A2E;
  --bg-secondary: #16213E;
  --bg-tertiary: #0F3460;
  --text-primary: #ECF0F1;
  --text-secondary: #BDC3C7;
  --border-color: #2C3E50;
}

[data-theme="light"] {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #E9ECEF;
  --text-primary: #2C3E50;
  --text-secondary: #6C757D;
  --border-color: #DEE2E6;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: var(--transition);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.main-nav {
  background: linear-gradient(135deg, var(--primary-color), #E94560);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.nav-logo {
  font-size: 1.8rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  background: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.theme-toggle {
  background: rgba(255,255,255,0.2);
  border: 2px solid white;
  color: white;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: white;
  transform: rotate(20deg) scale(1.1);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: white;
  border-radius: 3px;
  transition: var(--transition);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 4rem 0;
  color: white;
  text-align: center;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
  font-size: 1.3rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 15px;
  border: 2px solid rgba(255,255,255,0.2);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.3);
  background: rgba(255,255,255,0.15);
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  display: block;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: white;
}

.feature-card p {
  color: rgba(255,255,255,0.9);
  line-height: 1.6;
}

/* Main Content */
.main-content {
  padding: 4rem 0;
  min-height: 60vh;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--primary-color);
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

/* Calculator Section */
.calculator-section {
  background: var(--bg-secondary);
  padding: 3rem;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 3rem;
}

/* Tool Selector */
.tool-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.tool-btn {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  padding: 1.5rem 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 600;
}

.tool-btn:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--primary-color);
}

.tool-btn.active {
  background: linear-gradient(135deg, var(--primary-color), #E94560);
  color: white;
  border-color: transparent;
}

.tool-icon {
  font-size: 2rem;
}

/* Tool Panels */
.tool-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tool-panel.active {
  display: block;
}

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

.panel-header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.panel-header h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.panel-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Calculator Grids */
.calculator-grid, .converter-grid, .nutrition-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.calculator-input, .conversion-input, .nutrition-input {
  background: var(--bg-tertiary);
  padding: 2rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
}

.calculator-result, .conversion-result, .nutrition-result {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
}

/* Input Groups */
.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.input-group input[type="text"],
.input-group input[type="number"],
.input-group select,
.input-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.input-group textarea {
  resize: vertical;
  min-height: 150px;
  font-family: 'Courier New', monospace;
}

/* Buttons */
.btn-primary, .btn-secondary {
  padding: 1rem 2rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  margin-top: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #E94560);
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

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

/* Result Boxes */
.result-box {
  background: var(--bg-tertiary);
  padding: 1.5rem;
  border-radius: 8px;
  min-height: 200px;
  border-left: 4px solid var(--primary-color);
}

.placeholder-text {
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
  padding: 2rem;
}

.result-display {
  text-align: center;
  padding: 2rem;
}

.result-value {
  font-size: 3rem;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.result-info {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

/* Conversion Table */
.conversion-table {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 2px solid var(--border-color);
}

.conversion-table h5 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.conversion-table table {
  width: 100%;
  border-collapse: collapse;
}

.conversion-table td {
  padding: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

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

/* Nutrition Cards */
.nutrition-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.nutrition-card {
  background: linear-gradient(135deg, var(--secondary-color), #45B7AF);
  padding: 1.5rem;
  border-radius: 12px;
  text-align: center;
  color: white;
  box-shadow: var(--shadow);
}

.nutrition-value {
  font-size: 2.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.nutrition-label {
  font-size: 1rem;
  opacity: 0.9;
}

.serving-info {
  background: var(--bg-tertiary);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
}

.serving-info label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.serving-info input {
  width: 100px;
  padding: 0.5rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  text-align: center;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Ingredient Rows */
.ingredient-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.ingredient-row input,
.ingredient-row select {
  padding: 0.6rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Timer Container */
.timer-container {
  max-width: 600px;
  margin: 0 auto;
}

.time-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.active-timers {
  margin-top: 2rem;
  padding: 2rem;
  background: var(--bg-tertiary);
  border-radius: 12px;
  min-height: 200px;
}

.timer-item {
  background: var(--bg-primary);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  border-left: 4px solid var(--secondary-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.timer-info h4 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.timer-display {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary-color);
  font-family: 'Courier New', monospace;
}

.timer-controls {
  display: flex;
  gap: 0.5rem;
}

.timer-controls button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.timer-controls .pause-btn {
  background: var(--accent-color);
  color: var(--dark-bg);
}

.timer-controls .stop-btn {
  background: #E74C3C;
  color: white;
}

/* Ad Spaces */
.ad-space {
  margin: 2rem 0;
  min-height: 100px;
  background: var(--bg-tertiary);
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.ad-horizontal {
  min-height: 90px;
}

.ad-vertical {
  min-height: 250px;
}

.sidebar-ad {
  position: sticky;
  top: 100px;
  float: right;
  width: 300px;
  margin: 0 0 2rem 2rem;
}

/* SEO Content */
.seo-content {
  background: var(--bg-secondary);
  padding: 3rem;
  border-radius: 20px;
  box-shadow: var(--shadow);
  margin: 3rem 0;
}

.seo-content h2 {
  font-size: 2.2rem;
  color: var(--primary-color);
  margin-bottom: 2rem;
  text-align: center;
}

.seo-content h3 {
  font-size: 1.8rem;
  color: var(--text-primary);
  margin: 2rem 0 1rem 0;
}

.seo-content h4 {
  font-size: 1.4rem;
  color: var(--text-primary);
  margin: 1.5rem 0 1rem 0;
}

.seo-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.seo-content ul {
  margin: 1rem 0 1rem 2rem;
}

.seo-content li {
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  line-height: 1.7;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.content-block {
  background: var(--bg-tertiary);
  padding: 2rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
  transition: var(--transition);
}

.content-block:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.content-block h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.category-info {
  background: var(--bg-primary);
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  border-left: 4px solid var(--secondary-color);
}

/* FAQ Section */
.faq-section {
  margin: 3rem 0;
}

.faq-item {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.faq-item h4 {
  background: var(--bg-tertiary);
  padding: 1.5rem;
  margin: 0;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item h4::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.faq-item.active h4::after {
  content: '−';
}

.faq-item p {
  padding: 1.5rem;
  margin: 0;
  display: none;
}

.faq-item.active p {
  display: block;
}

/* Footer */
.site-footer {
  background: linear-gradient(135deg, var(--dark-bg), #2C3E50);
  color: var(--text-light);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: white;
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.footer-section p {
  color: rgba(255,255,255,0.8);
  line-height: 1.6;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 1.5rem;
  text-align: center;
  color: rgba(255,255,255,0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-color);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .calculator-grid,
  .converter-grid,
  .nutrition-grid {
    grid-template-columns: 1fr;
  }
  
  .tool-selector {
    grid-template-columns: 1fr;
  }
  
  .sidebar-ad {
    float: none;
    width: 100%;
    margin: 2rem 0;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .nutrition-cards {
    grid-template-columns: 1fr;
  }
  
  .ingredient-row {
    grid-template-columns: 1fr;
  }
}