/* ==========================================================================
   Header Network — Two-row site header with network navigation
   /css/frontend/header-network.css
   Layer 5 — requires tokens.css, base.css, layout.css, components.css
   ========================================================================== */

:root {
    --header-height: 92px;
}

.site-header {
    padding: 0;
}

/* Row 1: Logo + Priority Sites */
.site-header__row-1 {
    padding: 8px 0;
}

.site-header__row-1 .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-header__logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-accent);
}

.site-header__logo-mark {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    color: var(--color-accent);
    transition: opacity var(--transition-fast);
}

.site-header__logo:hover .site-header__logo-mark {
    opacity: 0.8;
}

.site-header__logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.site-header__logo:hover .site-header__logo-text {
    color: var(--color-accent-hover);
}

.site-header__priority {
    display: flex;
    align-items: center;
    gap: 16px;
}

.site-header__priority-link {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.site-header__priority-link:hover {
    color: var(--color-accent-hover);
}

/* Row 2: Network Nav Bar */
.site-header__row-2 {
    display: flex;
    align-items: center;
    padding: 8px var(--spacing-4);
    max-width: var(--width-container);
    margin: 0 auto;
    width: 100%;
    gap: 8px;
}

.site-header__scroll-btn {
    flex-shrink: 0;
    width: var(--size-touch-target);
    height: var(--size-touch-target);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-subtle);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: var(--text-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-header__scroll-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-accent-subtle);
}

.site-header__scroll-btn[hidden] {
    display: none;
}

.site-header__nav-scroll {
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.site-header__nav-scroll::-webkit-scrollbar {
    display: none;
}

.site-header__nav-pills {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    padding: 0 4px;
}

.site-header__nav-pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-subtle);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-header__nav-pill:hover {
    color: var(--color-accent-hover);
    background: var(--color-accent-subtle);
}

/* More dropdown */
.site-header__nav-pill--more {
    position: relative;
    flex-shrink: 0;
}

.site-header__more-trigger {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-subtle);
    border-radius: var(--radius-full);
    cursor: pointer;
    user-select: none;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-header__more-trigger:hover {
    color: var(--color-accent-hover);
    background: var(--color-accent-subtle);
}

.site-header__more-trigger .site-header__more-arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.site-header__more-trigger.is-open .site-header__more-arrow {
    transform: rotate(180deg);
}

/* Detached to <body> at runtime (see app.js) to escape .site-header__nav-scroll's
   overflow-y: hidden clipping; positioned via fixed top/right set by JS. */
.site-header__more-dropdown {
    position: fixed;
    z-index: var(--z-dropdown);
    min-width: 180px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-dropdown), 0 0 0 1px var(--color-accent-subtle);
    padding: var(--spacing-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
}

.site-header__more-dropdown::before {
    content: '';
    position: absolute;
    top: -5px;
    right: 20px;
    width: 9px;
    height: 9px;
    background: var(--color-bg-surface);
    border-left: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    transform: rotate(45deg);
}

.site-header__more-dropdown.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.site-header__dropdown-link {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.site-header__dropdown-link:hover {
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

.site-header__dropdown-link:focus-visible {
    outline: none;
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    box-shadow: var(--shadow-ring-accent);
}

.site-header__dropdown-link + .site-header__dropdown-link {
    margin-top: 2px;
}

/* Mobile portrait: buttons stay visible (2026-08-19 — previously hidden
   here, relying on touch-swipe alone; real-world testing showed users
   didn't realize the nav-pill row scrolled at all with no visible
   affordance, so the buttons are kept at every width now). Only the
   row-2 padding still needs a mobile-specific tweak. */
@media (max-width: 768px) {
    .site-header__row-2 {
        padding: 8px var(--spacing-3);
    }
}

/* ==========================================================================
   2026-09-22 — header actions (search + mobile Sites dropdown)
   ========================================================================== */

.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    flex-shrink: 0;
}

.site-header__icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--size-touch-target);
    height: var(--size-touch-target);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-subtle);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.site-header__icon-btn:hover,
.site-header__icon-btn[aria-expanded="true"] {
    color: var(--color-accent-hover);
}

/* Mobile "Sites ▾" — desktop hides it (nav pills are visible there). */
.site-header__sites {
    display: none;
    position: relative;
    flex-shrink: 0;
}

.site-header__sites-trigger {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    font-family: inherit;
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-subtle);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.site-header__sites-trigger:hover,
.site-header__sites-trigger.is-open {
    color: var(--color-accent-hover);
}

.site-header__sites-trigger.is-open .site-header__more-arrow {
    transform: rotate(180deg);
}

.site-header__sites-trigger .site-header__more-arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.site-header__dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-2) var(--spacing-1);
}

/* Search bar — collapsible strip under row 1. NB: never set `display` on
   .site-header__search or .site-header__search-results themselves —
   author display rules would override the [hidden] attribute and they'd
   never hide. Style their children instead. */
.site-header__search .container {
    padding-top: var(--spacing-2);
    padding-bottom: var(--spacing-3);
    position: relative;
}

.site-header__search-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--text-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header__search-input:focus {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-ring-accent);
}

.site-header__search-results {
    position: absolute;
    left: var(--spacing-4);
    right: var(--spacing-4);
    top: 100%;
    z-index: var(--z-dropdown);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-dropdown);
    padding: var(--spacing-2);
    max-height: 60vh;
    overflow-y: auto;
}

.site-header__search-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.site-header__search-result:hover {
    background: var(--color-bg-elevated);
}

.site-header__search-badge {
    flex-shrink: 0;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.site-header__search-result .site-header__search-badge:last-child {
    color: var(--color-text-muted);
}

.site-header__search-empty {
    padding: var(--spacing-3);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   2026-09-22 — mobile: collapse to a single header row
   The nav-pill row folds into the "Sites ▾" dropdown (markup stays in the
   DOM for crawlers). Priority links stay visible — they're the monetized
   cross-links. H1/intro shrink handled in rooms-feed.css.
   ========================================================================== */
@media (max-width: 768px) {
    /* Single visible row now — body { padding-top: var(--header-height) }
       uses this to clear the fixed header, so it must match row 1's real
       height (~44px touch targets + 16px padding) or the page top shows
       dead space. */
    :root {
        --header-height: 60px;
    }

    .site-header__row-1 .container {
        gap: var(--spacing-2);
    }

    .site-header__row-2 {
        display: none;
    }

    .site-header__sites {
        display: block;
    }

    .site-header__priority {
        gap: var(--spacing-3);
    }

    .site-header__priority-link {
        font-size: var(--text-xs);
    }

    .site-header__logo-text {
        font-size: var(--text-lg, 1.125rem);
    }
}

/* Very small screens: brand text can go, the hex mark carries it. */
@media (max-width: 400px) {
    .site-header__logo-text {
        display: none;
    }
}