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

body {
    font-family: 'Google Sans', 'Roboto', sans-serif;
    background-color: #202124; 
    color: #e8eaed; 
    -webkit-font-smoothing: antialiased;
}

header {
    background-color: #292a2d; 
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 2px 0 rgba(0,0,0,0.3), 0 2px 6px 2px rgba(0,0,0,0.15);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    max-width: 800px;
    margin: 0 auto;
}

.header-top h1 {
    font-size: 1.5rem;
    font-weight: 500;
    color: #e8eaed;
}

.refresh-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background-color: #3c4043; 
    color: #8ab4f8; 
    border: none;
    padding: 8px 16px;
    border-radius: 24px;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.2s;
    font-family: 'Google Sans', sans-serif;
}

.refresh-btn:hover { background-color: #4a4d51; }
.refresh-btn.loading svg { animation: spin 1s linear infinite; }

@keyframes spin { 100% { transform: rotate(360deg); } }

#category-nav {
    display: flex;
    overflow-x: auto;
    padding: 0 20px 8px 20px;
    max-width: 800px;
    margin: 0 auto;
    scrollbar-width: none; 
}

#category-nav::-webkit-scrollbar { display: none; } 

.nav-btn {
    background: none;
    border: none;
    padding: 8px 16px;
    margin-right: 8px;
    font-size: 0.95rem;
    color: #9aa0a6; 
    cursor: pointer;
    border-radius: 16px;
    white-space: nowrap;
    font-family: 'Google Sans', sans-serif;
}

.nav-btn.active {
    background-color: #414347; 
    color: #e8eaed;
    font-weight: 500;
}

main {
    max-width: 600px;
    margin: 24px auto;
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card {
    background: #303134; 
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 2px 0 rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 1px 3px 0 rgba(0,0,0,0.5), 0 4px 8px 3px rgba(0,0,0,0.3);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: #3c4043; 
}

.card-content { padding: 16px; }

.card-title {
    font-size: 1.25rem;
    line-height: 1.4;
    font-weight: 500;
    margin-bottom: 12px;
    color: #e8eaed; 
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #9aa0a6;
    font-family: 'Roboto', sans-serif;
}

.loader {
    text-align: center;
    color: #9aa0a6;
    margin-top: 40px;
}