/* Birthday Compatibility Calculator - Modern Light Theme */
:root {
    --primary: #FF6B9D;
    --secondary: #A855F7;
    --accent: #F59E0B;
    --dark: #1F2937;
    --success: #10B981;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}

body {
    background: linear-gradient(135deg, #FFF5F7 0%, #FEE2E2 50%, #FECACA 100%);
    color: var(--dark);
    min-height: 100vh;
    padding-bottom: 80px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 107, 157, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-logo {
    font-family: 'Patrick Hand', cursive;
    font-size: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 107, 157, 0.2);
    border-radius: 24px;
    padding: 2.5rem 2rem;
    box-shadow: 0 8px 30px rgba(255, 107, 157, 0.15);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '🎂';
    position: absolute;
    top: -20px;
    right: -20px;
    font-size: 8rem;
    opacity: 0.05;
    transform: rotate(15deg);
}

.title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: #6B7280;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-size: 0.9rem;
    text-align: left;
}

input[type="text"],
input[type="date"] {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #E5E7EB;
    border-radius: 12px;
    background: #fff;
    font-size: 1rem;
    transition: all 0.3s;
    font-family: 'Poppins', sans-serif;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.birthday-divider {
    font-size: 2rem;
    margin: 1.5rem 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.btn-calculate {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.3);
    margin-top: 1rem;
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 157, 0.4);
}

.btn-calculate:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.result-box {
    margin-top: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(255, 107, 157, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 16px;
    display: none;
    animation: slideIn 0.5s;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-score {
    font-size: 4rem;
    font-weight: 900;
    color: var(--primary);
    text-shadow: 0 2px 10px rgba(255, 107, 157, 0.3);
}

.result-message {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1rem 0;
    color: var(--dark);
}

.result-details {
    color: #6B7280;
    line-height: 1.8;
    margin-top: 1rem;
}

.info-card {
    background: #F0F9FF;
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 2rem;
    text-align: left;
}

.info-card strong {
    color: #1E40AF;
    display: block;
    margin-bottom: 0.5rem;
}

/* SEO Content */
.seo-content {
    margin-top: 4rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

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

.seo-content h3 {
    margin: 2rem 0 1rem;
    color: var(--secondary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 2rem 0;
}

.feature-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(255, 107, 157, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: #6B7280;
    font-size: 0.9rem;
    line-height: 1.6;
}

.faq-section {
    margin-top: 3rem;
}

.faq-item {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.faq-item strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.faq-item p {
    color: #4B5563;
    line-height: 1.6;
}

.mobile-nav {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 3px 25px;
    border-radius: 50px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: flex;
    gap: 25px;
    z-index: 200;
}

.mobile-nav a {
    font-size: 1.6rem;
    opacity: 0.5;
    filter: grayscale(100%);
    transition: 0.2s;
    text-decoration: none;
}

.mobile-nav a.active {
    opacity: 1;
    filter: grayscale(0%);
    transform: scale(1.15);
}

.mobile-nav a:hover {
    opacity: 1;
    filter: grayscale(0%);
}

@media (max-width: 640px) {
    .title {
        font-size: 1.3rem;
    }

    .subtitle {
        margin-bottom: .9rem;
        font-size: 0.7rem;
    }


    .input-group {
        margin-bottom: 0.8rem;
    }

    .input-group label {
        margin-bottom: 0.5rem;
        font-size: 0.8rem;
    }

    input[type="text"],
    input[type="date"] {
        width: 100%;
        padding: 6px 10px;
        border: 1px solid #E5E7EB;
        border-radius: 12px;
        font-size: 0.7rem;
    }


    .feature-grid {
        grid-template-columns: 1fr;
    }
}