.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}
h1 {
    color: black;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.5rem;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.add-section {
    background: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.add-form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.add-form input, .add-form select, .add-form button {
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
}
.add-form input {
    flex: 1;
    min-width: 200px;
}
.add-form select {
    flex: 1;
    min-width: 200px;
    cursor: pointer;
}
.add-form button {
    background: #667eea;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}
.add-form button:hover {
    background: #5568d3;
}
.timezone-list {
    display: grid;
    gap: 15px;
}
.timezone-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s, box-shadow 0.2s;
}
.timezone-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}
.timezone-card.night {
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    color: white;
}
.timezone-card.day {
    background: linear-gradient(135deg, #fef5e7 0%, #fdeaa8 100%);
}
.timezone-card.morning {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
}
.timezone-card.evening {
    background: linear-gradient(135deg, #fab1a0 0%, #ff7675 100%);
}
.timezone-info {
    flex: 1;
}
.timezone-label {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 5px;
}
.friend-name {
    font-size: 1rem;
    font-weight: 500;
    color: #667eea;
    margin-bottom: 10px;
}
.timezone-card.night .friend-name {
    color: #a8b5ff;
}
.timezone-time {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}
.timezone-details {
    font-size: 0.9rem;
    opacity: 0.8;
}
.time-icon {
    font-size: 2.5rem;
    margin-right: 20px;
}
.remove-btn {
    background: #ff4757;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}
.remove-btn:hover {
    background: #ee5a6f;
}
.timezone-card.night .remove-btn {
    background: #ff6b81;
}
@media (max-width: 600px) {
    h1 {
    font-size: 1.8rem;
    }
    .timezone-time {
    font-size: 2rem;
    }
    .timezone-card {
    flex-direction: column;
    text-align: center;
    }
    .time-icon {
    margin: 0 0 10px 0;
    }
}