/* ============================================================
 * Preferences Page – Self-Contained Styles
 * ============================================================ */

/* ------------------------------------------------------------
 * Theme
 * ------------------------------------------------------------ */

:root {
    --bg: #0f1115;
    --card: #171a21;
    --card-alt: #1e222b;
    --text: #e6e6eb;
    --muted: #9aa0a6;
    --accent: #5c7cfa;
    --border: #242832;
}

/* ------------------------------------------------------------
 * Base
 * ------------------------------------------------------------ */

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
}

/* ------------------------------------------------------------
 * Header
 * ------------------------------------------------------------ */

header {
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

header h1 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
}

.back-link {
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

/* ------------------------------------------------------------
 * Layout
 * ------------------------------------------------------------ */

.preferences {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1.2rem;

    display: grid;
    gap: 2rem;
}

/* ------------------------------------------------------------
 * Sections
 * ------------------------------------------------------------ */

.pref-section {
    background: var(--card);
    border-radius: 12px;
    padding: 1.2rem 1.4rem;
}

.pref-section h2 {
    margin: 0 0 0.6rem 0;
    font-size: 1rem;
    font-weight: 600;
}

.pref-explainer {
    margin: 0;
    font-size: 0.85rem;
    color: var(--muted);
    line-height: 1.5;
}

/* ------------------------------------------------------------
 * Reading Activity
 * ------------------------------------------------------------ */

.pref-box {
    margin-top: 0.4rem;
    font-size: 0.9rem;
    color: var(--text);
}

/* ------------------------------------------------------------
 * Lists (Topics / Authors)
 * ------------------------------------------------------------ */

.pref-list {
    display: grid;
    gap: 0.4rem;
    margin-top: 0.6rem;
}

/* ------------------------------------------------------------
 * Preference Row
 * ------------------------------------------------------------ */

.pref-row {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 0.8rem;

    background: var(--card-alt);
    padding: 0.35rem 0.6rem;
    border-radius: 6px;

    font-size: 0.8rem;
    color: var(--text);
}

.pref-row span.value {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ------------------------------------------------------------
 * How recommendations work list
 * ------------------------------------------------------------ */

.pref-section ul {
    margin: 0.4rem 0 0 1.1rem;
    padding: 0;
}

.pref-section li {
    font-size: 0.85rem;
    color: var(--muted);
    line-height: 1.5;
}

/* ------------------------------------------------------------
 * Responsive
 * ------------------------------------------------------------ */

@media (max-width: 700px) {
    .preferences {
        margin-top: 1.5rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }
}

/* ------------------------------------------------------------
 * Actions
 * ------------------------------------------------------------ */

.pref-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.pref-actions button {
    background: var(--card-alt);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
}

.pref-actions button:hover {
    border-color: var(--accent);
}

/* ------------------------------------------------------------
 * Bar graph
 * ------------------------------------------------------------ */

.bar-graph {
    display: grid;
    gap: 0.4rem;
    margin-top: 0.6rem;
}

.bar-row {
    display: grid;
    grid-template-columns: 90px 1fr 50px;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.75rem;
}

.bar-track {
    height: 6px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--accent);
}