/**
 * Page Shell — shared layout shell for index.html pages
 *
 * Layer between modern-design-system.css + navigation-toolbar.css and page-specific CSS.
 * Extracts repeated inline patterns: page containers, hero headers, tab bars, stat bars,
 * section panels, and tab panel visibility.
 *
 * Does NOT duplicate page-layout-metrics.css (nav offset / layout-standard) or
 * modern-design-system.css (cards, buttons, typography base).
 *
 * Import order:
 *   modern-design-system.css → navigation-toolbar.css → page-shell.css → feature modules → page CSS
 */
@layer page-shell {

:root {
    --shell-max-width: 1200px;
    --shell-max-width-wide: 1400px;
    --shell-side-padding: clamp(12px, 3vw, 24px);
    --shell-bottom-padding: clamp(32px, 5vw, 64px);
}

/* ── Page container / layout shell ─────────────────────────────────────────── */

.page-container,
.page-shell,
.page-main-wrap {
    max-width: var(--shell-max-width);
    margin-left: auto;
    margin-right: auto;
    padding: var(--shell-side-padding) var(--shell-side-padding) var(--shell-bottom-padding);
    position: relative;
    z-index: 2;
}

.page-shell-wide,
.page-container-wide {
    max-width: var(--shell-max-width-wide);
}

.page-main {
    position: relative;
    z-index: 2;
}

/* ── Page hero / header ────────────────────────────────────────────────────── */

.page-header,
.page-hero {
    text-align: center;
    margin-bottom: var(--spacing-lg, 1.5rem);
}

.page-header h1,
.page-hero h1,
.page-container > h1:first-of-type {
    font-size: var(--font-size-3xl, 2.25rem);
    font-weight: 700;
    margin: 0 0 var(--spacing-xs, 0.5rem);
    background: linear-gradient(135deg, var(--primary, #00ff88), var(--secondary, #00d4ff));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p,
.page-hero p {
    color: var(--text-secondary, rgba(255, 255, 255, 0.85));
    margin: 0;
}

/* ── Subtitle / lede ───────────────────────────────────────────────────────── */

.page-subtitle,
.subtitle {
    opacity: 0.65;
    margin: 0 0 var(--spacing-lg, 1.5rem);
    font-size: 0.95em;
    color: var(--text-secondary, rgba(255, 255, 255, 0.85));
}

/* ── Tab bar ───────────────────────────────────────────────────────────────── */

.tabs,
.page-tabs,
.tabs-container {
    display: flex;
    gap: var(--spacing-xs, 0.5rem);
    margin-bottom: var(--spacing-md, 1.5rem);
    flex-wrap: wrap;
}

.tabs-center,
.tabs-container {
    justify-content: center;
}

.tab-btn,
.tab-button,
.page-tab {
    padding: 8px 18px;
    border-radius: var(--radius-sm, 0.5rem);
    border: 1px solid var(--border-primary, rgba(255, 255, 255, 0.15));
    background: transparent;
    color: var(--text-tertiary, rgba(255, 255, 255, 0.85));
    cursor: pointer;
    font-size: 0.9em;
    font-family: inherit;
    transition: all var(--transition-fast, 0.15s ease);
}

.tab-btn:hover,
.tab-button:hover,
.page-tab:hover {
    border-color: var(--primary, #00ff88);
    color: var(--text-primary, #fff);
}

.tab-btn.active,
.tab-button.active,
.page-tab.active {
    background: rgba(0, 255, 136, 0.15);
    border-color: var(--primary, #00ff88);
    color: var(--primary, #00ff88);
}

/* ── Tab panels (show/hide) ────────────────────────────────────────────────── */

.tab-content,
.tab-panel,
.page-panel {
    display: none;
}

.tab-content.active,
.tab-panel.active,
.page-panel.active {
    display: block;
}

/* ── Summary / stats bar ───────────────────────────────────────────────────── */

.summary-bar,
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
    margin-bottom: var(--spacing-lg, 1.5rem);
}

.summary-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg, 1rem);
    padding: 18px;
    text-align: center;
}

.summary-card .val {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary, #00ff88);
}

.summary-card .lbl {
    font-size: 0.8em;
    opacity: 0.6;
    margin-top: 4px;
}

/* ── Section panel ─────────────────────────────────────────────────────────── */

.report-section,
.page-section {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg, 1rem);
    padding: 22px;
    margin-bottom: 20px;
}

.report-section h3,
.page-section h3 {
    margin: 0 0 14px;
    font-size: 1.1em;
}

/* ── Auto-fill card grid ───────────────────────────────────────────────────── */

.page-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.page-grid-tight {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

/* ── Muted text ────────────────────────────────────────────────────────────── */

.muted,
.text-muted {
    color: var(--text-muted, rgba(255, 255, 255, 0.7));
}

/* ── Text loading placeholder (not spinner) ────────────────────────────────── */

.page-loading,
.page-container .loading,
.tab-content .loading,
.page-shell .loading {
    display: block;
    width: auto;
    height: auto;
    border: none;
    animation: none;
    text-align: center;
    padding: 40px 20px;
    opacity: 0.5;
}

/* ── Monitor / dashboard shell (social-monitor, similar pages) ─────────────── */

.monitor-shell {
    width: min(var(--shell-max-width-wide), calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 var(--shell-bottom-padding);
    position: relative;
    z-index: 2;
}

.monitor-top {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 24px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.panel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 720px) {
    .monitor-top {
        display: block;
    }

    .monitor-top .actions {
        margin-top: 16px;
    }
}

@media (max-width: 600px) {
    .page-header h1,
    .page-hero h1 {
        font-size: 1.5rem;
    }

    .summary-bar,
    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }
}

} /* end @layer page-shell */