/* Reset and base styles */
* {
    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;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header styles */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: white;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 10px;
}

/* Input section styles */
.input-section {
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

#noteInput {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
    transition: border-color 0.3s ease;
}

#noteInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.add-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 15px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

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

/* Notes section styles */
.notes-section h2 {
    color: white;
    font-size: 1.8rem;
    margin-bottom: 20px;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}

.notes-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

/* Individual note styles */
.note {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border-left: 4px solid #667eea;
    position: relative;
    animation: slideIn 0.3s ease-out;
}

.note:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.note-content {
    font-size: 14px;
    line-height: 1.6;
    color: #555;
    margin-bottom: 15px;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #eee;
    padding-top: 15px;
}

.note-date {
    font-size: 12px;
    color: #888;
    font-style: italic;
}

.delete-btn {
    background: #ff4757;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(255, 71, 87, 0.3);
}

.delete-btn:hover {
    background: #ff3742;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 71, 87, 0.4);
}

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

/* Empty state */
.empty-state {
    text-align: center;
    color: white;
    font-size: 18px;
    margin-top: 50px;
    opacity: 0.8;
}

.empty-state::before {
    content: "📝";
    display: block;
    font-size: 4rem;
    margin-bottom: 20px;
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

.note.removing {
    animation: slideOut 0.3s ease-out;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .input-section {
        padding: 20px;
    }
    
    .notes-container {
        grid-template-columns: 1fr;
    }
    
    #noteInput {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .input-section {
        padding: 15px;
    }
    
    .note {
        padding: 15px;
    }
}

/* Footer styles */
.footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    color: white;
    font-size: 14px;
    opacity: 0.8;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
    margin: 0;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}