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

:root {
    /* Color Palette - Anti-Vaping Theme */
    --primary-color: #E74C3C;
    --secondary-color: #C0392B;
    --accent-color: #F39C12;
    --purple-accent: #8E44AD;
    --blue-accent: #2980B9;
    --pink-accent: #E91E63;
    --green-light: #27AE60;
    --orange-light: #F39C12;
    
    /* Neutral Colors */
    --dark-color: #2C3E50;
    --light-gray: #F8F9FA;
    --medium-gray: #6C757D;
    --white: #FFFFFF;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: 'Poppins', sans-serif;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --border-radius: 12px;
    --border-radius-lg: 20px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--dark-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: var(--transition);
    box-shadow: 0 2px 20px var(--shadow);
}

.navbar.scrolled {
    background: var(--white);
    box-shadow: 0 2px 30px var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
}

.nav-logo i {
    font-size: var(--font-size-xl);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--dark-color);
    transition: var(--transition);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--light-gray) 0%, #FFE8E8 100%);
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%234CAF50" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23FF6B35" opacity="0.1"/><circle cx="50" cy="10" r="1" fill="%23FFD23F" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: slideInLeft 1s ease-out;
}

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

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

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

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

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
    cursor: pointer;
    font-size: var(--font-size-base);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(231, 76, 60, 0.4);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: slideInRight 1s ease-out;
}

.floating-card {
    position: absolute;
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px var(--shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    background: linear-gradient(135deg, var(--green-light), var(--blue-accent));
    color: var(--white);
    animation-delay: 0s;
}

.card-2 {
    top: 60%;
    right: 20%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    animation-delay: 1s;
}

.card-3 {
    bottom: 30%;
    left: 30%;
    background: linear-gradient(135deg, var(--blue-accent), var(--purple-accent));
    color: var(--white);
    animation-delay: 2s;
}

/* Section Styles */
section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* About GERD Section */
.about {
    background: var(--light-gray);
}

.gerd-explanation {
    max-width: 800px;
    margin: 0 auto;
}

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

.gerd-definition,
.importance-teens {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--shadow);
    border-left: 5px solid var(--primary-color);
}

.gerd-definition h3,
.importance-teens h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.gerd-definition p,
.importance-teens p {
    line-height: 1.8;
    color: var(--dark-color);
}

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

.about-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--green-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--white);
}

.about-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.about-card p {
    color: var(--medium-gray);
    line-height: 1.7;
}

/* Symptoms Section */
.symptoms {
    background: var(--white);
}

.symptoms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.symptom-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
    border: 3px solid transparent;
    position: relative;
    overflow: hidden;
}

.symptom-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--pink-accent));
}

.symptom-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary-color);
    box-shadow: 0 15px 40px var(--shadow);
}

.symptom-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--secondary-color), var(--pink-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--white);
}

.symptom-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.symptom-card p {
    color: var(--medium-gray);
    line-height: 1.7;
}

/* Food Guide Section */
.food-guide {
    background: var(--light-gray);
}

.food-guide-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.food-table-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--shadow);
}

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

.food-table thead {
    background: linear-gradient(135deg, var(--primary-color), var(--green-light));
    color: var(--white);
}

.food-table.restricted thead {
    background: linear-gradient(135deg, var(--secondary-color), var(--pink-accent));
}

.food-table th,
.food-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    border-bottom: 1px solid #E9ECEF;
}

.food-table th {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.food-table tbody tr:hover {
    background: var(--light-gray);
}

.food-table td {
    color: var(--dark-color);
    line-height: 1.6;
}

.food-table td:first-child {
    font-weight: 500;
}

/* Food Groups Section - keeping for backward compatibility */
.food-groups {
    background: var(--white);
}

.food-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--primary-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-pane.active {
    display: block;
}

.food-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.food-item {
    background: var(--light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 3px solid transparent;
}

.food-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    background: var(--white);
    box-shadow: 0 10px 30px var(--shadow);
}

.food-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.food-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

.food-item p {
    color: var(--medium-gray);
    font-size: 14px;
}

/* Eating Habits Section */
.habits {
    background: linear-gradient(135deg, var(--light-gray) 0%, #F0F8F0 100%);
}

.habits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.habit-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.habit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition);
}

.habit-card:hover::before {
    opacity: 0.05;
}

.habit-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow);
}

.habit-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--orange-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--dark-color);
    font-size: 14px;
}

.habit-icon {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 2rem;
    opacity: 0.3;
}

.habit-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.habit-card p {
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

/* Tips Section - keeping for backward compatibility */
.tips {
    background: linear-gradient(135deg, var(--light-gray) 0%, #F0F8F0 100%);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.tip-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tip-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition);
}

.tip-card:hover::before {
    opacity: 0.05;
}

.tip-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow);
}

.tip-number {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), var(--orange-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--dark-color);
    font-size: 14px;
}

.tip-icon {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 2rem;
    opacity: 0.3;
}

.tip-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.tip-card p {
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

/* Lifestyle Section */
.lifestyle {
    background: var(--white);
}

.lifestyle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.lifestyle-card {
    background: var(--light-gray);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 3px solid transparent;
    position: relative;
    overflow: hidden;
}

.lifestyle-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--blue-accent), var(--purple-accent));
}

.lifestyle-card:hover {
    transform: translateY(-10px);
    border-color: var(--blue-accent);
    background: var(--white);
    box-shadow: 0 15px 40px var(--shadow);
}

.lifestyle-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--blue-accent), var(--purple-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--white);
}

.lifestyle-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.lifestyle-card p {
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.lifestyle-benefit {
    background: linear-gradient(135deg, var(--blue-accent), var(--purple-accent));
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.conclusion-section {
    margin-top: var(--spacing-2xl);
}

.conclusion-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: 0 10px 30px rgba(76, 175, 80, 0.3);
}

.conclusion-card h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
}

.conclusion-card p {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

/* Recipes Section - keeping for backward compatibility */
.recipes {
    background: var(--white);
}

.recipe-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.recipe-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
}

.recipe-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow);
}

.recipe-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 3rem;
}

.recipe-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: rgba(255, 255, 255, 0.9);
    color: var(--dark-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.recipe-time {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.recipe-content {
    padding: var(--spacing-xl);
}

.recipe-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--dark-color);
}

.recipe-content p {
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.recipe-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--medium-gray);
    font-size: 14px;
}

.stat i {
    color: var(--primary-color);
}

.recipe-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--green-light));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.recipe-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

/* Contact Section */
.contact {
    background: var(--light-gray);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(10px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--green-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: var(--font-size-lg);
}

.contact-details h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

.contact-details p {
    color: var(--medium-gray);
}

.contact-form {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--shadow);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #E9ECEF;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

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

/* Footer */
.footer {
    background: var(--dark-color);
    color: var(--white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

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

.footer-section p {
    color: #BDC3C7;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

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

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

.footer-section ul li a {
    color: #BDC3C7;
    text-decoration: none;
    transition: var(--transition);
}

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

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

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--secondary-color);
    transform: translateY(-3px);
}

.newsletter {
    display: flex;
    gap: var(--spacing-xs);
}

.newsletter input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid #34495E;
    border-radius: var(--border-radius);
    background: #34495E;
    color: var(--white);
    font-family: var(--font-family);
}

.newsletter input::placeholder {
    color: #BDC3C7;
}

.newsletter button {
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #34495E;
    color: #BDC3C7;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.developer-credit {
    opacity: 0.7;
    transition: var(--transition);
}

.developer-credit:hover {
    opacity: 1;
}

.developer-credit a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.developer-credit a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

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

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

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

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

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 28px;
        --font-size-2xl: 24px;
        --font-size-xl: 18px;
        --font-size-lg: 16px;
        --spacing-2xl: 2rem;
        --spacing-xl: 1.5rem;
        --spacing-lg: 1rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px var(--shadow);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: var(--spacing-md) 0;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .nav-menu {
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
    }
    
    .nav-link {
        font-size: 16px;
        padding: var(--spacing-sm) 0;
    }
    
    .hero {
        padding-top: 100px;
        min-height: 80vh;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 24px;
        line-height: 1.3;
        margin-bottom: var(--spacing-md);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-buttons {
        justify-content: center;
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .hero-image {
        display: none;
    }
    
    .floating-card {
        position: static;
        display: inline-block;
        margin: var(--spacing-xs);
        animation: none;
        font-size: 12px;
        padding: var(--spacing-sm);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .about-card {
        padding: var(--spacing-lg);
    }
    
    .gerd-definition,
    .importance-teens {
        padding: var(--spacing-lg);
    }
    
    .symptoms-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .symptom-card {
        padding: var(--spacing-lg);
    }
    
    .food-guide-tabs,
    .food-tabs {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-xs);
    }
    
    .tab-btn {
        width: 100%;
        max-width: 280px;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 14px;
    }
    
    .food-table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .food-table {
        min-width: 600px;
        font-size: 14px;
    }
    
    .food-table th,
    .food-table td {
        padding: var(--spacing-sm);
        white-space: nowrap;
    }
    
    .food-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .food-item {
        padding: var(--spacing-md);
    }
    
    .habits-grid,
    .tips-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .habit-card,
    .tip-card {
        padding: var(--spacing-lg);
    }
    
    .lifestyle-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .lifestyle-card {
        padding: var(--spacing-lg);
    }
    
    .conclusion-card {
        padding: var(--spacing-lg);
    }
    
    .conclusion-card h3 {
        font-size: var(--font-size-xl);
    }
    
    .conclusion-card p {
        font-size: var(--font-size-base);
    }
    
    .recipe-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding-top: 80px;
    }
    
    .hero-title {
        font-size: 22px;
        line-height: 1.2;
    }
    
    .hero-description {
        font-size: 14px;
    }
    
    .btn {
        justify-content: center;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 14px;
    }
    
    .section-title {
        font-size: 22px;
    }
    
    .section-subtitle {
        font-size: var(--font-size-base);
    }
    
    .food-table {
        font-size: 12px;
        min-width: 500px;
    }
    
    .food-table th,
    .food-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .habits-grid,
    .tips-grid,
    .lifestyle-grid {
        gap: var(--spacing-md);
    }
    
    .habit-card,
    .tip-card,
    .lifestyle-card {
        padding: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .newsletter {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .newsletter input {
        width: 100%;
    }
}

/* Scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}