/* Global Variables */
:root {
    --bg-body: #f4f6f8;
    --bg-card: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --accent-color: #3182ce;
    --accent-hover: #2b6cb0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --input-bg: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --header-height: 60px;
}

[data-theme="dark"] {
    --bg-body: #1a202c;
    --bg-card: #2d3748;
    --text-main: #f7fafc;
    --text-muted: #a0aec0;
    --border-color: #4a5568;
    --accent-color: #63b3ed;
    --accent-hover: #4299e1;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --input-bg: #2d3748;
}

/* Reset & Base */
body {
    font-family: var(--font-family);
    background-color: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-color); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }
ul { list-style: none; padding: 0; margin: 0; }

/* Layout */
.header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header h1 { font-size: 1.25rem; font-weight: 700; margin: 0; }

.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: var(--accent-color); }

.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* Components */
.button, button, input[type="submit"] {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.button:hover, button:hover, input[type="submit"]:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.button.secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}
.button.secondary:hover {
    background-color: var(--border-color);
    color: var(--text-main);
}

input[type="text"], input[type="password"], input[type="number"], textarea, select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px 12px;
    border-radius: 6px;
    width: 100%;
    box-sizing: border-box;
    font-size: 0.95rem;
    transition: border-color 0.2s;
    margin-bottom: 10px;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.15);
}

.card, .item {
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--border-color);
    color: var(--text-main);
}

/* Reader View Styles */
.reader-layout { display: flex; gap: 30px; align-items: flex-start; }
.sidebar { width: 280px; flex-shrink: 0; position: sticky; top: 90px; }
.main-content { flex-grow: 1; min-width: 0; }

.filter-box {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.item {
    padding: 25px;
    margin-bottom: 25px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.item:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
.item.read { opacity: 0.75; background-color: var(--bg-body); }
.item h2 { margin-top: 0; font-size: 1.4rem; line-height: 1.4; }
.item .meta { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 15px; display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.item .description { font-size: 1rem; line-height: 1.7; color: var(--text-main); }
.item .description img { max-width: 100%; height: auto; border-radius: 6px; margin: 10px 0; }

/* Dashboard Grid (Index) */
.feed-category { margin-bottom: 30px; }
.feed-category h3 { border-bottom: 2px solid var(--border-color); padding-bottom: 10px; margin-bottom: 15px; color: var(--text-muted); text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.05em; }
.feed-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 15px; }
.feed-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    transition: border-color 0.2s;
}
.feed-card:hover { border-color: var(--accent-color); }
.feed-card-header { display: flex; align-items: center; margin-bottom: 10px; font-weight: 600; }
.feed-card-header img { width: 20px; height: 20px; margin-right: 10px; border-radius: 4px; }
.feed-card-meta { font-size: 0.8rem; color: var(--text-muted); margin-top: auto; display: flex; justify-content: space-between; align-items: center; }
.feed-actions { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--border-color); font-size: 0.8rem; display: flex; gap: 10px; }

/* Mobile */
@media (max-width: 768px) {
    .reader-layout { flex-direction: column; }
    .sidebar { width: 100%; position: static; margin-bottom: 20px; }
    .header { height: auto; flex-direction: column; padding: 15px; gap: 10px; }
    .nav-links { flex-wrap: wrap; justify-content: center; }
}