:root {
    /* 60% - Primary/Background Colors */
    --primary-bg: #f0f4f8;
    --card-bg: #ffffff;
    
    /* 30% - Secondary Colors */
    --secondary-color: #0891b2;
    --secondary-light: #e2e8f0;
    --secondary-dark: #334155;
    
    /* 10% - Accent Colors */
    --accent-color: #0ea5e9;
    --accent-light: #bae6fd;
    --accent-dark: #0284c7;
    
    /* Text Colors */
    --text-dark: #0f172a;
    --text-light: #ffffff;
    --text-muted: #64748b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', system-ui, sans-serif;
}

body {
    background: var(--primary-bg);
    color: var(--text-dark);
}

.app-bar {
    background: #ffffff;
    color: var(--accent-dark);
    padding: 5px 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.app-bar h1 {
    margin: 0;
    font-size: 20px;
    font-weight: 800;
    color: #0284c7;
}

.header-icon {
    background: none;
    border: none;
    color: var(--accent-dark);
    cursor: pointer;
    margin-right: 8px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.header-icon:hover {
    background: rgba(14, 165, 233, 0.1);
}

.container {
    max-width: 600px;
    margin: 16px auto;
    padding: 0 16px;
}

.notes-grid {
    display: grid;
    gap: 12px;
}

.notes-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    border: 1px solid var(--secondary-light);
}

.notes-card:hover, .notes-card:focus {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-light);
}

.notes-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.notes-icon {
    width: 45px;
    height: 45px;
    background: var(--accent-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    box-shadow: 0 5px 15px rgba(14, 165, 233, 0.15);
}

.notes-content h3 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: var(--text-dark);
}

.notes-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.notes-status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-color);
}

.reading-time {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-dark);
    background-color: var(--accent-light);
    padding: 4px 10px;
    border-radius: 12px;
    display: inline-block;
    text-align: center;
    min-width: 60px;
}

@media (max-width: 576px) {
    .container {
        padding: 0 12px;
        margin: 15px auto;
    }
    
    .app-bar {
        padding: 5px ;
    }
    
    .notes-icon {
        width: 40px;
        height: 40px;
    }
    
    .notes-content h3 {
        font-size: 1rem;
    }
}