:root {
    --primary-color: #4CAF50;
    --secondary-color: #FF9800;
    --text-color: #333;
    --background-color: #f4f6f8;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --input-border: #ddd;
    --transition-speed: 0.3s;
}

[data-theme='dark'] {
    --text-color: #e0e0e0;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --input-border: #444;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    padding-top: 70px; /* For fixed navbar */
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--card-background);
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 1rem;
    background: linear-gradient(45deg, var(--primary-color), #66BB6A);
    text-shadow: 0 2px 4px var(--shadow-color);
    position: relative;
    margin-bottom: 2rem;
}

/* Section Containers */
.section-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.intro-section, .privacy-section {
    padding: 4rem 1rem;
    background-color: var(--card-background);
    margin: 2rem 0;
    border-radius: 20px;
    box-shadow: 0 5px 15px var(--shadow-color);
}

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

.benefit-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.privacy-section h2 {
    color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--card-background);
    padding: 3rem 1rem;
    margin-top: 5rem;
    border-top: 1px solid var(--input-border);
    text-align: center;
}

.footer-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
    padding: 0;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
}

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

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    text-align: center;
}

.theme-btn {
    position: absolute;
    top: -1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

/* Toggle icons */
[data-theme='dark'] .icon-sun { display: block; }
[data-theme='dark'] .icon-moon { display: none; }
[data-theme='light'] .icon-sun { display: none; }
[data-theme='light'] .icon-moon { display: block; }
.icon-sun, .icon-moon { transition: opacity 0.3s ease; }

header h1 {
    margin: 0;
    font-size: 2.8rem;
    font-weight: 700;
}

header p {
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.9;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.input-section {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
    gap: 1rem;
}

#ingredient-input {
    width: 60%;
    max-width: 500px;
    padding: 1rem;
    font-size: 1.1rem;
    border: 2px solid var(--input-border);
    border-radius: 50px;
    background-color: var(--card-background);
    color: var(--text-color);
    transition: all 0.3s ease;
}

#ingredient-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.3);
}

/* Contact Form Styles */
.contact-section {
    margin-top: 5rem;
    padding: 3rem;
    background-color: var(--card-background);
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
}

.contact-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.contact-form {
    max-width: 600px;
    margin: 2rem auto 0;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    padding: 1rem;
    border: 2px solid var(--input-border);
    border-radius: 10px;
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.submit-btn {
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.3s ease;
}

.submit-btn:hover {
    background-color: #43A047;
    transform: translateY(-2px);
}

.comments-section {
    margin-top: 5rem;
    padding: 2rem;
    background-color: var(--card-background);
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
}

#recommend-btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
}

#recommend-btn:hover {
    background-color: #FB8C00;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 152, 0, 0.4);
}

#recommend-btn svg {
    stroke: white;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.2rem;
    }
    .input-section {
        flex-direction: column;
    }
    #ingredient-input {
        width: 90%;
    }
}