/* ======================================
   GROW A GARDEN CALCULATOR - MAIN STYLES
   Author: SeedGuides
   Year: 2025
   ====================================== */

/* ===== CSS VARIABLES ===== */
:root {
  /* Primary Colors - Dopamine-triggering palette */
  --primary-green: #00ff88;
  --primary-green-dark: #00cc6a;
  --secondary-green: #4ecdc4;
  --accent-yellow: #ffd93d;
  --accent-orange: #ff6b35;
  --accent-purple: #a855f7;
  --accent-blue: #3b82f6;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
  --gradient-accent: linear-gradient(135deg, var(--accent-yellow), var(--accent-orange));
  --gradient-dark: linear-gradient(135deg, #1a1a2e, #16213e);
  --gradient-light: linear-gradient(135deg, #f0fff4, #e6fffa);
  
  /* Neumorphic shadows */
  --shadow-light: -8px -8px 16px rgba(255, 255, 255, 0.7);
  --shadow-dark: 8px 8px 16px rgba(0, 0, 0, 0.1);
  --shadow-inset: inset -4px -4px 8px rgba(255, 255, 255, 0.7), inset 4px 4px 8px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-primary: 'Poppins', -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;
  --font-size-5xl: 3rem;
  
  /* 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: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index layers */
  --z-negative: -1;
  --z-normal: 1;
  --z-tooltip: 10;
  --z-fixed: 100;
  --z-modal: 1000;
  --z-overlay: 2000;
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: #2d3748;
  background: var(--gradient-light);
  overflow-x: hidden;
  position: relative;
}

/* ===== 3D BACKGROUND ===== */
#threejs-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-negative);
  opacity: 0.1;
}

/* ===== FLOATING PARTICLES ===== */
.particles-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-normal);
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-green);
  border-radius: 50%;
  animation: float 6s infinite ease-in-out;
  opacity: 0.6;
}

.particle:nth-child(1) {
  left: 10%;
  top: 20%;
  animation-delay: 0s;
  background: var(--primary-green);
}

.particle:nth-child(2) {
  left: 80%;
  top: 60%;
  animation-delay: 1s;
  background: var(--accent-yellow);
}

.particle:nth-child(3) {
  left: 30%;
  top: 80%;
  animation-delay: 2s;
  background: var(--accent-orange);
}

.particle:nth-child(4) {
  left: 90%;
  top: 10%;
  animation-delay: 3s;
  background: var(--secondary-green);
}

.particle:nth-child(5) {
  left: 50%;
  top: 40%;
  animation-delay: 4s;
  background: var(--accent-purple);
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
    opacity: 0.6;
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
    opacity: 1;
  }
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===== HEADER ===== */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  z-index: var(--z-fixed);
  padding: var(--spacing-md) 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: var(--transition-normal);
}

.main-header.scrolled {
  padding: var(--spacing-sm) 0;
  background: rgba(255, 255, 255, 0.98);
}

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

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-3d {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-dark);
  animation: logo-pulse 3s infinite ease-in-out;
}

.logo-3d i {
  font-size: var(--font-size-xl);
  color: white;
}

@keyframes logo-pulse {
  0%, 100% {
    transform: scale(1) rotateY(0deg);
    box-shadow: var(--shadow-dark);
  }
  50% {
    transform: scale(1.05) rotateY(180deg);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
  }
}

.logo-text h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text p {
  font-size: var(--font-size-sm);
  color: #718096;
  margin-top: var(--spacing-xs);
}

.main-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-full);
  text-decoration: none;
  color: #4a5568;
  font-weight: 500;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-light), var(--shadow-dark);
}

.nav-link:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

/* ===== HERO SECTION ===== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
}

.title-line {
  display: block;
  animation: slideInUp 1s ease-out;
}

.title-line:nth-child(2) {
  animation-delay: 0.2s;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-description {
  font-size: var(--font-size-lg);
  color: #4a5568;
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

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

.cta-button {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.cta-button.primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

.cta-button.primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 255, 136, 0.4);
}

.button-glow {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s ease;
}

.cta-button.primary:hover .button-glow {
  left: 100%;
}

.cta-button.secondary {
  background: rgba(255, 255, 255, 0.9);
  color: #4a5568;
  border: 2px solid var(--primary-green);
}

.cta-button.secondary:hover {
  background: var(--primary-green);
  color: white;
  transform: translateY(-3px);
}

/* ===== 3D FLOATING PLANT ===== */
.hero-visual {
  perspective: 1000px;
}

.floating-plant {
  transform-style: preserve-3d;
  animation: plant-float 4s infinite ease-in-out;
}

@keyframes plant-float {
  0%, 100% {
    transform: translateY(0) rotateY(0deg);
  }
  50% {
    transform: translateY(-20px) rotateY(180deg);
  }
}

.plant-container {
  position: relative;
  width: 200px;
  height: 250px;
  margin: 0 auto;
}

.plant-stem {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 120px;
  background: var(--gradient-primary);
  border-radius: 4px;
  box-shadow: var(--shadow-dark);
}

.plant-leaves {
  position: absolute;
  top: 50px;
  left: 50%;
  transform: translateX(-50%);
}

.leaf {
  position: absolute;
  width: 40px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50% 10px 50% 10px;
  transform-origin: bottom center;
  animation: leaf-sway 3s infinite ease-in-out;
}

.leaf-1 {
  transform: rotate(-30deg);
  animation-delay: 0s;
}

.leaf-2 {
  transform: rotate(0deg);
  animation-delay: 0.5s;
}

.leaf-3 {
  transform: rotate(30deg);
  animation-delay: 1s;
}

@keyframes leaf-sway {
  0%, 100% {
    transform: rotate(var(--rotation)) scale(1);
  }
  50% {
    transform: rotate(var(--rotation)) scale(1.1);
  }
}

.plant-flowers {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
}

.flower {
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--gradient-accent);
  border-radius: 50%;
  animation: flower-bloom 2s infinite ease-in-out;
}

.flower-1 {
  top: -10px;
  left: -15px;
  animation-delay: 0s;
}

.flower-2 {
  top: -15px;
  left: 5px;
  animation-delay: 0.7s;
}

.flower-3 {
  top: -10px;
  left: 25px;
  animation-delay: 1.4s;
}

@keyframes flower-bloom {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: #718096;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== CALCULATOR SECTION ===== */
.calculator-section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.calculator-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.calculator-card, .results-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-light), var(--shadow-dark);
  backdrop-filter: blur(10px);
  animation: card-float 6s infinite ease-in-out;
}

@keyframes card-float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid #e2e8f0;
}

.card-header i {
  font-size: var(--font-size-xl);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: #2d3748;
}

.form-group {
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: #4a5568;
}

.form-group input, .form-group select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-inset);
}

.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1), var(--shadow-inset);
}

.input-icon {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: #a0aec0;
  pointer-events: none;
}

.calculate-button {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.calculate-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

.calculate-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.button-loader {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: var(--spacing-sm);
}

.calculate-button.loading .button-loader {
  display: block;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== RESULTS ===== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.result-item {
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition-fast);
  border: 1px solid rgba(0, 255, 136, 0.1);
}

.result-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.2);
}

.result-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  box-shadow: var(--shadow-dark);
}

.result-icon i {
  font-size: var(--font-size-lg);
  color: white;
}

.result-label {
  display: block;
  font-size: var(--font-size-sm);
  color: #718096;
  margin-bottom: var(--spacing-xs);
}

.result-value {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: #2d3748;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.planting-guide {
  background: rgba(240, 255, 244, 0.7);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--primary-green);
}

.planting-guide h4 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  color: #2d3748;
}

.guide-content {
  color: #4a5568;
  line-height: 1.6;
}

/* ===== AI ASSISTANT SECTION ===== */
.ai-section {
  padding: var(--spacing-3xl) 0;
  background: rgba(255, 255, 255, 0.5);
  position: relative;
}

.ai-container {
  max-width: 800px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light), var(--shadow-dark);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.ai-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
  background: var(--gradient-dark);
  color: white;
}

.ai-avatar {
  position: relative;
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-dark);
}

.ai-avatar i {
  font-size: var(--font-size-xl);
  color: white;
}

.ai-status {
  position: absolute;
  bottom: 5px;
  right: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid white;
}

.ai-status.online {
  background: var(--primary-green);
  animation: status-pulse 2s infinite;
}

@keyframes status-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.2);
  }
}

.ai-info h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.ai-info p {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.ai-controls {
  margin-left: auto;
  display: flex;
  gap: var(--spacing-sm);
}

.ai-btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  color: white;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* ===== CHAT CONTAINER ===== */
.chat-container {
  height: 500px;
  display: flex;
  flex-direction: column;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.7);
}

.message {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  animation: message-appear 0.3s ease-out;
}

@keyframes message-appear {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ai-message .message-avatar {
  background: var(--gradient-primary);
  color: white;
}

.user-message .message-avatar {
  background: var(--gradient-accent);
  color: white;
}

.message-content {
  flex: 1;
  max-width: 70%;
}

.message-text {
  background: rgba(255, 255, 255, 0.9);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-light), var(--shadow-dark);
  margin-bottom: var(--spacing-sm);
  line-height: 1.6;
}

.user-message .message-text {
  background: var(--gradient-primary);
  color: white;
}

.message-time {
  font-size: var(--font-size-xs);
  color: #a0aec0;
  padding: 0 var(--spacing-sm);
}

.chat-input-container {
  padding: var(--spacing-lg);
  background: white;
  border-top: 1px solid #e2e8f0;
}

.chat-input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

#chat-input {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  resize: none;
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  min-height: 40px;
  max-height: 120px;
}

#chat-input:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.send-button {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 50px;
}

.send-button:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 20px rgba(0, 255, 136, 0.3);
}

.send-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.chat-options {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.option-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.option-btn:hover {
  background: var(--gradient-primary);
  color: white;
  border-color: var(--primary-green);
}

/* ===== PLANT DATABASE SECTION ===== */
.database-section {
  padding: var(--spacing-3xl) 0;
}

.database-container {
  max-width: 1000px;
  margin: 0 auto;
}

.database-search {
  margin-bottom: var(--spacing-xl);
}

.search-box {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

#plant-search {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
}

#plant-search:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.search-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.search-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 20px rgba(0, 255, 136, 0.3);
}

.filter-tags {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.filter-tag {
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.8);
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.filter-tag.active, .filter-tag:hover {
  background: var(--gradient-primary);
  color: white;
  border-color: var(--primary-green);
  transform: translateY(-2px);
}

.plant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.plant-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-light), var(--shadow-dark);
  transition: var(--transition-normal);
  animation: card-appear 0.5s ease-out;
}

@keyframes card-appear {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.plant-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.plant-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition-normal);
}

.plant-card:hover .plant-image {
  transform: scale(1.1);
}

.plant-info {
  padding: var(--spacing-lg);
}

.plant-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: #2d3748;
  margin-bottom: var(--spacing-xs);
}

.plant-scientific {
  font-size: var(--font-size-sm);
  color: #718096;
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

.plant-category {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.plant-details {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid #e2e8f0;
}

.detail-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.detail-label {
  color: #718096;
}

.detail-value {
  font-weight: 500;
  color: #2d3748;
}

.load-more-btn {
  display: block;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.load-more-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

/* ===== FOOTER ===== */
.main-footer {
  background: var(--gradient-dark);
  color: white;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--primary-green);
}

.footer-section ul {
  list-style: none;
}

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

.footer-section a {
  color: #a0aec0;
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary-green);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-logo i {
  font-size: var(--font-size-xl);
  color: var(--primary-green);
}

.footer-logo span {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

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

.social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  font-size: 1.1rem;
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: scale(1.1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #a0aec0;
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.loading-content {
  text-align: center;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(0, 255, 136, 0.2);
  border-top: 4px solid var(--primary-green);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-lg);
}

.loading-content p {
  color: #4a5568;
  font-size: var(--font-size-lg);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .calculator-container {
    grid-template-columns: 1fr;
  }
  
  .main-nav {
    display: none;
  }
  
  .plant-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .results-grid {
    grid-template-columns: 1fr;
  }
  
  .chat-options {
    justify-content: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .cta-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .calculator-card, .results-card {
    padding: var(--spacing-lg);
  }
}

/* ===== ANIMATION CLASSES ===== */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

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

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