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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.container {
    max-width: 600px;
    width: 100%;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-section label {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
}

.date-input {
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    transition: border-color 0.3s;
}

.date-input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f0f0f0;
    color: #666;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.countdown-section {
    animation: fadeIn 0.5s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.countdown-display {
    text-align: center;
    padding: 60px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    margin-bottom: 25px;
    width: 100%;
    transition: all 0.5s ease;
}

.countdown-display.celebration {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.countdown-number {
    font-size: 6rem;
    font-weight: bold;
    color: white;
    line-height: 1;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.3);
    margin-bottom: 15px;
}

.countdown-label {
    font-size: 1.5rem;
    color: white;
    opacity: 0.95;
    font-weight: 500;
}

.target-info {
    text-align: center;
    margin-bottom: 25px;
}

.target-info p {
    font-size: 1.1rem;
    color: #666;
}

.target-info span {
    font-weight: 600;
    color: #333;
}

.btn-change {
    padding: 10px 30px;
    font-size: 0.95rem;
    font-weight: 500;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-change:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

#confetti {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

footer {
    text-align: center;
    color: white;
    margin-top: 20px;
    opacity: 0.8;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }

    .card {
        padding: 25px;
    }

    .countdown-number {
        font-size: 4.5rem;
    }

    .countdown-label {
        font-size: 1.2rem;
    }

    .countdown-display {
        padding: 40px 20px;
    }
}