* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

:root {
    --primary-color: #e0e5ec;
    --text-color: #2d3436;
    --shadow-light: 8px 8px 15px #a3b1c6, -8px -8px 15px #ffffff;
    --shadow-inset: inset 4px 4px 8px #a3b1c6, inset -4px -4px 8px #ffffff;
    --shadow-dark: 8px 8px 15px #202425, -8px -8px 15px #404648;
    --shadow-inset-dark: inset 4px 4px 8px #202425, inset -4px -4px 8px #404648;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--primary-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 2rem;
    transition: background-color 0.5s ease;
}

body.dark-mode {
    --primary-color: #2d3436;
    --text-color: #e0e5ec;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem;
    border-radius: 50%;
    border: none;
    background: var(--primary-color);
    box-shadow: var(--shadow-light);
    cursor: pointer;
    color: var(--text-color);
}

.dark-mode .theme-toggle {
    box-shadow: var(--shadow-dark);
}

.quote-box {
    background: var(--primary-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.dark-mode .quote-box {
    box-shadow: var(--shadow-dark);
}

.quote-text {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.quote-author {
    font-style: italic;
    margin-bottom: 1.5rem;
}

.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 10px;
    background: var(--primary-color);
    box-shadow: var(--shadow-light);
    color: var(--text-color);
    cursor: pointer;
    margin: 0.5rem;
    font-size: 1rem;
}

.dark-mode .btn {
    box-shadow: var(--shadow-dark);
}

.btn:active {
    box-shadow: var(--shadow-inset);
}

.dark-mode .btn:active {
    box-shadow: var(--shadow-inset-dark);
}

.btn-group {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.favorite-quote {
    background: var(--primary-color);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    margin-bottom: 1rem;
    animation: slideIn 0.3s ease;
}

.dark-mode .favorite-quote {
    box-shadow: var(--shadow-dark);
}

.note-input {
    width: 100%;
    padding: 0.8rem;
    margin-top: 1rem;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    box-shadow: var(--shadow-inset);
    color: var(--text-color);
}

.dark-mode .note-input {
    box-shadow: var(--shadow-inset-dark);
}

.loading {
    display: none;
    text-align: center;
    margin: 2rem 0;
}

.loading.active {
    display: block;
}

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

.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 1rem 2rem;
    border-radius: 10px;
    background: var(--primary-color);
    box-shadow: var(--shadow-light);
    transform: translateX(200%);
    transition: transform 0.3s ease;
}

.notification.show {
    transform: translateX(0);
}

.dark-mode .notification {
    box-shadow: var(--shadow-dark);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .quote-text {
        font-size: 1.2rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        margin: 0.5rem 0;
    }
}