:root {
    --primary: #FF6B9D;
    --primary-dark: #FF4785;
    --secondary: #4ECDC4;
    --accent: #FFE66D;
    --accent-2: #FF8C42;
    --bg-gradient-1: #667eea;
    --bg-gradient-2: #764ba2;
    --bg-gradient-3: #f093fb;
    --bg-gradient-4: #f5576c;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.15);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Nunito', sans-serif;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 25%, var(--bg-gradient-3) 75%, var(--bg-gradient-4) 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    color: var(--gray-800);
    overflow-x: hidden;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
}

/* Floating Balloons */
.balloon {
    position: fixed;
    font-size: 3rem;
    animation: float 6s ease-in-out infinite;
    opacity: 0.7;
    pointer-events: none;
    z-index: 0;
}

.balloon-1 { top: 10%; left: 5%; animation-delay: 0s; }
.balloon-2 { top: 20%; right: 8%; animation-delay: 1.5s; }
.balloon-3 { top: 60%; left: 3%; animation-delay: 3s; }
.balloon-4 { bottom: 20%; right: 5%; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-30px) rotate(5deg); }
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

header h1 {
    font-family: 'Fredoka', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--white);
    text-shadow: 3px 3px 0 rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
    animation: bounce 2s ease infinite;
}

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

.subtitle {
    font-size: 1.2rem;
    color: var(--accent);
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* Input Section */
.input-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

.input-section label {
    display: block;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 15px;
    text-align: center;
}

.input-wrapper {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

input[type="date"] {
    font-family: 'Nunito', sans-serif;
    font-size: 1.1rem;
    padding: 15px 20px;
    border: 3px solid var(--gray-200);
    border-radius: var(--radius-md);
    outline: none;
    transition: all 0.3s ease;
    min-width: 200px;
}

input[type="date"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 107, 157, 0.2);
}

.btn-primary {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

.btn-primary:active {
    transform: translateY(0);
}

.hint {
    text-align: center;
    color: var(--gray-600);
    margin-top: 15px;
    font-size: 0.95rem;
}

/* Results Section */
.results-section {
    animation: fadeInUp 0.6s ease;
}

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

.hidden {
    display: none !important;
}

/* Main Result Card */
.main-result {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    margin-bottom: 25px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.main-result::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: rotate(0deg); }
    50% { transform: rotate(180deg); }
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.main-result h2 {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.age-display {
    display: flex;
    justify-content: center;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px;
    position: relative;
    z-index: 1;
}

.big-number {
    font-family: 'Fredoka', sans-serif;
    font-size: 4rem;
    font-weight: 700;
    color: var(--gray-800);
    text-shadow: 2px 2px 0 rgba(255, 255, 255, 0.5);
    line-height: 1;
}

.unit {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gray-800);
    margin-right: 15px;
}

.unit:last-child {
    margin-right: 0;
}

.exact-text {
    font-size: 1.2rem;
    color: var(--gray-800);
    margin-top: 15px;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-value {
    font-family: 'Fredoka', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-600);
    font-weight: 600;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.info-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border-top: 4px solid var(--secondary);
}

.info-card:nth-child(2) { border-top-color: var(--primary); }
.info-card:nth-child(3) { border-top-color: var(--accent-2); }
.info-card:nth-child(4) { border-top-color: var(--bg-gradient-1); }

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.info-card h3 {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: 10px;
    font-weight: 500;
}

.info-value {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 5px;
}

.info-sub {
    font-size: 0.85rem;
    color: var(--gray-600);
}

.countdown {
    font-size: 1rem;
    color: var(--primary-dark);
    font-weight: 700;
    margin-top: 8px;
    padding: 8px 15px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    display: inline-block;
}

/* Share Section */
.share-section {
    text-align: center;
    padding: 20px;
}

.btn-secondary {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 15px 35px;
    background: var(--white);
    color: var(--primary-dark);
    border: 3px solid var(--primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--white);
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 600px) {
    header h1 {
        font-size: 2.5rem;
    }
    
    .input-section {
        padding: 25px;
    }
    
    .input-wrapper {
        flex-direction: column;
    }
    
    input[type="date"] {
        width: 100%;
    }
    
    .btn-primary {
        width: 100%;
        justify-content: center;
    }
    
    .big-number {
        font-size: 2.5rem;
    }
    
    .unit {
        font-size: 1.1rem;
    }
    
    .stats-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }
}

/* Confetti Animation */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confetti-fall 3s ease-out forwards;
    pointer-events: none;
    z-index: 1000;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}