/* --- General Setup & Variables --- */
:root {
    --primary-color: #007bff;
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-color: #1c1e21;
    --text-secondary-color: #65676b;
    --border-color: #dddfe2;
    --font-family: 'Inter', sans-serif;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
}

a {
    text-decoration: none;
    color: inherit;
}

/* --- Main App Layout --- */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    width: 280px;
    background-color: var(--card-background);
    padding: 20px;
    border-right: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar h2 {
    font-size: 1.2rem;
    margin-top: 0;
}

.sidebar nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.sidebar nav li a {
    display: block;
    padding: 12px 15px;
    border-radius: 8px;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.sidebar nav li a:hover {
    background-color: #f0f0f0;
}

.sidebar nav li.selected a {
    background-color: var(--primary-color);
    color: white;
}

/* --- Main Feed --- */
.feed {
    flex-grow: 1;
    padding: 24px;
    max-width: 680px;
    margin: 0 auto;
}

/* --- Feed Item Card --- */
.feed-item {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.feed-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
}

.profile-pic {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 12px;
}

.user-info h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
}

.user-info span {
    font-size: 0.8rem;
    color: var(--text-secondary-color);
}

.feed-content {
    padding: 4px 16px;
}

.feed-content p {
    margin: 8px 0 16px;
    line-height: 1.5;
}

.feed-media {
    max-width: 100%;
    border-radius: 8px;
    display: block; /* Removes bottom space for images */
}

audio.feed-media,
video.feed-media {
    width: 100%; /* Make players full width of container */
}

.feed-footer {
    padding: 12px 16px;
    font-size: 0.8rem;
    color: var(--text-secondary-color);
    border-top: 1px solid var(--border-color);
}

/* --- Link Preview Card --- */
.link-preview {
    display: block;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    margin: 16px 0;
    transition: background-color 0.2s ease;
}

.link-preview:hover {
    background-color: #fafafa;
}

.link-preview-img {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
}

.link-preview-text {
    padding: 12px 16px;
}

.link-preview-text h4 {
    margin: 0 0 4px 0;
    font-size: 1rem;
}

.link-preview-text p {
    margin: 0 0 8px 0;
    font-size: 0.9rem;
    color: var(--text-secondary-color);
}

.link-preview-text span {
    font-size: 0.8rem;
    color: #8a8a8a;
    text-transform: uppercase;
}