/* app-header-nav.css — parte 2 del split de styles-professional.css (2026-07-18).
   Header (brand, badges, panel de ajustes) y navegación agrupada con dropdowns.
   ORDEN DE CARGA OBLIGATORIO: app-base → header-nav → home → practice →
   browse → strokes → quiz → stats → enhancements → dashboard-extras.
   La cascada depende de este orden; no reordenar los <link>. */

/* ============================================================================
   4. HEADER
   ============================================================================ */
.app-header {
    position: relative;
    /* Changed from fixed */
    width: 100%;
    height: var(--header-height);
    background: var(--bg-app);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

/* Brand/Logo */
.header-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-brand .logo {
    height: 36px;
    width: auto;
    filter: drop-shadow(0 0 8px rgba(244, 63, 94, 0.3));
    transition: var(--transition-normal);
}

.header-brand:hover .logo {
    transform: none;
}

.logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-left: 12px;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
    white-space: nowrap;
    letter-spacing: -0.5px;
}

.app-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    margin: 0;
    white-space: nowrap;
}

/* Stats Badges */
.header-stats {
    display: flex;
    gap: 16px;
    background: rgba(255, 255, 255, 0.03);
    padding: 6px 12px;
    border-radius: var(--radius-full, 50px);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.header-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.header-stat-value {
    color: var(--text-main);
    font-weight: 700;
    font-feature-settings: "tnum";
}

.header-progress {
    width: 60px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.header-progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Header Controls */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    pointer-events: auto;
}

.mobile-only {
    display: none !important;
}

.desktop-only {
    display: inline-flex;
}

div.nav-group.desktop-only {
    display: flex;
}

/* Panel de ajustes (idioma, voz, audio): dropdown bajo el engranaje,
   cerrado por defecto en todos los viewports */
.header-settings-group {
    display: none;
}

.header-actions {
    position: relative;
}

.header-actions.settings-open .header-settings-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 8px;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    min-width: 220px;
    animation: slideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 6px 10px;
    border-radius: var(--radius-md);
}

.settings-row:hover {
    background: var(--color-bg-hover);
}

.settings-row-label {
    font-size: 0.85rem;
    font-weight: var(--weight-medium);
    color: var(--text-muted);
}

.settings-row select {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    padding: 6px 8px;
    font-size: 0.85rem;
    min-width: 96px;
    cursor: pointer;
}

.settings-row select:focus-visible {
    outline: none;
    box-shadow: var(--shadow-glow);
}

#tone-colors-select {
    min-width: 140px;
    max-width: 175px;
}

.tone-preview-dots {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    margin-left: 6px;
    vertical-align: middle;
}

.tone-preview-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.25s ease, transform 0.2s ease;
}

.tone-preview-dot-1 { background-color: var(--color-tone-1); }
.tone-preview-dot-2 { background-color: var(--color-tone-2); }
.tone-preview-dot-3 { background-color: var(--color-tone-3); }
.tone-preview-dot-4 { background-color: var(--color-tone-4); }

#header-search {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    width: 200px;
    transition: all var(--transition-normal);
}

#header-search:focus {
    outline: none;
    background: var(--color-bg-input);
    border-color: var(--primary);
    width: 240px;
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.header-control {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 8px;
    min-width: 36px;
    min-height: 36px;
    border-radius: 50%;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
}

.header-control:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================================================
   5. NAVIGATION
   ============================================================================ */
.nav-container {
    width: 100%;
    background: var(--bg-app);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 900;
    display: flex;
    justify-content: center;
}

.nav-tabs {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    gap: 30px;
    overflow: visible;
}

.nav-tab {
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 12px 16px;
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
    white-space: nowrap;
    border-radius: var(--radius-sm);
}

.nav-tab:hover {
    color: var(--text-main);
    background: var(--color-bg-hover);
}

.nav-tab.active {
    color: var(--primary);
    font-weight: 600;
    background: transparent;
    border-bottom: 3px solid var(--primary);
    border-radius: 0;
    padding-bottom: 9px;
}

.nav-tab::after {
    display: none;
}

.nav-tab.active::after {
    display: none;
}

/* Grouped Navigation & Dropdowns CSS */
.nav-group {
    position: relative;
    display: inline-block;
}

.nav-group-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    opacity: 0;
    visibility: hidden;
    background: rgba(10, 10, 10, 0.85); /* Modern dark glass */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08); /* Clean modern border */
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05);
    padding: 8px;
    min-width: 190px;
    z-index: 1000;
    transition: transform var(--transition-normal) ease, opacity var(--transition-normal) ease, visibility var(--transition-normal) ease;
}

/* Invisible bridge to prevent dropdown hover gap flickering */
.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
    background: transparent;
}

html[data-theme="light"] .nav-dropdown {
    background: rgba(255, 255, 255, 0.85); /* Modern light glass */
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.02);
}

/* Mobile-specific elements hidden on desktop */
.nav-dropdown-header,
.nav-backdrop {
    display: none;
}

/* Open states on class toggle */
.nav-group.open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(4px);
}

.nav-group.open .dropdown-chevron {
    transform: rotate(180deg);
}

/* Desktop hover/focus-within only on pointer devices */
@media (hover: hover) and (pointer: fine) {
    .nav-group:hover .nav-dropdown,
    .nav-group:focus-within .nav-dropdown {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(4px);
    }

    .nav-group:hover .dropdown-chevron,
    .nav-group:focus-within .dropdown-chevron {
        transform: rotate(180deg);
    }
}

.nav-dropdown-item {
    display: flex;
    align-items: center;
    width: 100%;
    background: none;
    border: none;
    color: #e5e3df; /* Warm text on dark background */
    font-size: 0.9rem;
    padding: 10px 14px;
    text-align: left;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast) ease;
    white-space: nowrap;
    font-family: inherit;
}

html[data-theme="light"] .nav-dropdown-item {
    color: var(--color-text-charcoal);
}

.dropdown-item-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0.75;
    transition: opacity var(--transition-fast) ease, transform var(--transition-fast) ease;
}

.nav-dropdown-item:hover .dropdown-item-icon {
    opacity: 1;
    transform: scale(1.1);
}

.nav-dropdown-item.active .dropdown-item-icon {
    opacity: 1;
}

.nav-dropdown-item:hover {
    color: var(--color-accent);
    background: rgba(255, 255, 255, 0.08);
    padding-left: 18px; /* Small slide effect */
}

html[data-theme="light"] .nav-dropdown-item:hover {
    color: var(--color-primary);
    background: var(--color-bg-hover);
}

.nav-dropdown-item.active {
    color: var(--color-accent);
    font-weight: 600;
    background: rgba(245, 158, 11, 0.15);
}

html[data-theme="light"] .nav-dropdown-item.active {
    color: var(--color-primary);
    background: rgba(211, 47, 47, 0.08);
}

/* Parent active style */
.nav-group.parent-active > .nav-group-trigger {
    color: var(--primary);
    font-weight: 600;
    border-bottom: 3px solid var(--primary);
    border-radius: 0;
    padding-bottom: 9px;
}


/* Nav Icons (using ASCII art from original or emojis as fallback for now) */
.nav-tab .ascii-art,
.nav-tab span[role="img"] {
    margin-right: 6px;
    font-size: 1.1em;
}

/* ============================================================================
/* ============================================================================
   MOBILE RESPONSIVE NAVIGATION & HEADER (BOTTOM BAR NAVIGATION)
   ============================================================================ */
@media (max-width: 768px) {
    .mobile-only {
        display: flex !important;
    }

    .desktop-only {
        display: none !important;
    }

    .app-header {
        height: 64px !important;
        padding: 0 12px !important;
        padding-top: var(--safe-area-top, 0px) !important;
    }

    .header-container {
        padding: 0 !important;
        max-width: 100%;
    }

    .header-content {
        padding: 0;
        gap: 6px;
    }

    .header-brand {
        display: flex !important;
        align-items: center !important;
        min-width: fit-content;
        flex-shrink: 0;
        gap: 6px;
    }

    .header-brand .logo {
        height: 28px !important;
        width: 28px !important;
        flex-shrink: 0;
    }

    .logo-text {
        min-width: fit-content;
        margin-left: 4px;
    }

    .app-title {
        font-size: 1rem !important;
        white-space: nowrap;
    }

    .app-subtitle {
        display: none !important;
    }

    .header-stats {
        display: flex !important;
        align-items: center;
        gap: 0;
        margin: 0 4px;
    }

    .header-stat {
        padding: 3px 8px !important;
        background: rgba(239, 68, 68, 0.12) !important;
        border: 1px solid rgba(239, 68, 68, 0.25) !important;
        border-radius: 12px !important;
        display: flex !important;
        align-items: center !important;
        gap: 3px !important;
        min-height: 28px;
    }

    .header-stat-label {
        display: none !important;
    }

    .header-streak-icon {
        font-size: 0.9rem !important;
    }

    .header-stat-value {
        font-size: 0.85rem !important;
        font-weight: 800 !important;
        color: #ef4444 !important;
    }

    .header-actions {
        gap: 6px;
        flex-shrink: 0;
    }

    #header-search {
        width: 36px;
        padding: 8px;
        background: transparent;
        border: none;
        color: transparent;
    }

    #header-search::placeholder {
        color: transparent;
    }

    #header-search:focus {
        width: 130px;
        color: var(--text-main);
        background: var(--bg-panel);
        border: 1px solid var(--color-border);
        padding: 6px 12px;
    }

    #header-search:focus::placeholder {
        color: var(--text-dim);
    }

    .header-control {
        min-width: 40px;
        min-height: 40px;
        padding: 8px;
    }

    /* Dropdown de ajustes anclado de forma segura en móvil */
    .header-actions.settings-open .header-settings-group {
        position: fixed;
        top: calc(var(--header-height) + var(--safe-area-top, 0px) + 6px);
        right: 12px;
        left: auto;
        max-width: calc(100vw - 24px);
        min-width: 210px;
        z-index: var(--z-toast, 1100);
        box-shadow: 0 12px 36px rgba(0, 0, 0, 0.3);
    }

    .settings-row {
        min-height: 44px;
    }

    .settings-row select {
        min-height: 40px;
        font-size: 0.9rem;
    }

    /* Auth compacto en móvil */
    .auth-guest-mode {
        padding: 0 !important;
        border: none !important;
        background: transparent !important;
    }

    .auth-guest-mode .guest-info {
        display: none !important;
    }

    .auth-login-btn {
        font-size: 0 !important;
        padding: 8px !important;
        min-width: 40px;
        min-height: 40px;
        justify-content: center;
        border-radius: 50% !important;
    }

    /* Mobile Backdrop Scrim */
    .nav-backdrop {
        display: block !important;
        position: fixed !important;
        inset: 0 !important;
        background: rgba(0, 0, 0, 0.65) !important;
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: 990 !important;
        opacity: 0 !important;
        visibility: hidden !important;
        pointer-events: none !important;
        transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
    }

    body.nav-menu-open .nav-backdrop {
        opacity: 1 !important;
        visibility: visible !important;
        pointer-events: auto !important;
    }

    /* Mobile Bottom Navigation Bar */
    .nav-container {
        position: fixed !important;
        bottom: 0 !important;
        top: auto !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        background: var(--bg-panel) !important;
        border-top: 1px solid var(--color-border) !important;
        border-bottom: none !important;
        border-radius: 16px 16px 0 0 !important;
        box-shadow: 0 -6px 20px rgba(0, 0, 0, 0.16) !important;
        padding: 4px 0 max(4px, var(--safe-area-bottom, 0px)) !important;
        z-index: 1000 !important;
        height: calc(60px + var(--safe-area-bottom, 0px)) !important;
        display: flex !important;
        align-items: center !important;
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }

    .nav-tabs {
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 4px !important;
        display: flex !important;
        justify-content: space-around !important;
        align-items: center !important;
        gap: 0 !important;
        overflow: visible !important;
    }

    /* Equal distribution for direct tabs and dropdown groups */
    .nav-tab,
    .nav-group {
        flex: 1 1 0 !important;
        min-width: 0 !important;
    }

    .nav-group {
        display: flex !important;
        align-items: stretch !important;
        justify-content: center !important;
        position: relative !important;
    }

    .nav-tab {
        font-size: 0.72rem !important;
        padding: 4px 2px !important;
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        justify-content: center !important;
        gap: 3px !important;
        width: 100% !important;
        min-height: 50px !important;
        color: var(--text-muted) !important;
        background: transparent !important;
        height: auto !important;
        border: none !important;
        white-space: nowrap !important;
        text-overflow: ellipsis;
        overflow: visible !important;
        touch-action: manipulation;
        transition: color 0.15s ease, transform 0.1s ease !important;
    }

    .nav-tab:active {
        transform: scale(0.95);
    }

    .nav-tab span {
        font-size: 0.72rem !important;
        letter-spacing: -0.01em;
        line-height: 1.15;
        font-weight: 500;
        display: inline-flex;
        align-items: center;
        gap: 1px;
    }

    .nav-tab svg:not(.dropdown-chevron) {
        margin-right: 0 !important;
        width: 20px !important;
        height: 20px !important;
        flex-shrink: 0;
    }

    .nav-tab.active {
        color: var(--primary) !important;
        border-bottom: none !important;
        background: transparent !important;
        font-weight: 600 !important;
    }

    .nav-tab.active::after,
    .nav-group.parent-active > .nav-group-trigger::after {
        display: block !important;
        content: '' !important;
        position: absolute !important;
        bottom: -2px !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        width: 4px !important;
        height: 4px !important;
        background: var(--primary) !important;
        border-radius: 50% !important;
    }

    .nav-group.parent-active > .nav-group-trigger {
        color: var(--primary) !important;
        font-weight: 600 !important;
        border-bottom: none !important;
        padding-bottom: 4px !important;
    }

    /* Micro-chevron for dropdown groups on mobile */
    .nav-tab .dropdown-chevron {
        display: inline-block !important;
        width: 9px !important;
        height: 9px !important;
        margin-left: 2px !important;
        opacity: 0.75;
        transition: transform 0.2s ease;
        vertical-align: middle;
        flex-shrink: 0;
    }

    .nav-group.open .dropdown-chevron {
        transform: rotate(180deg) !important;
    }

    /* Mobile Bottom Sheet Dropdown */
    .nav-dropdown {
        position: fixed !important;
        top: auto !important;
        bottom: calc(60px + var(--safe-area-bottom, 0px) + 8px) !important;
        left: 8px !important;
        right: 8px !important;
        width: calc(100% - 16px) !important;
        max-width: 460px !important;
        margin: 0 auto !important;
        transform: translateY(16px) !important;
        opacity: 0 !important;
        visibility: hidden !important;
        pointer-events: none;
        background: var(--bg-panel) !important;
        backdrop-filter: blur(24px) !important;
        -webkit-backdrop-filter: blur(24px) !important;
        border: 1px solid var(--color-border) !important;
        border-radius: var(--radius-xl, 20px) !important;
        box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.08) !important;
        padding: 8px 10px 12px 10px !important;
        min-width: unset !important;
        max-height: min(75vh, 480px) !important;
        overflow-y: auto !important;
        overscroll-behavior: contain !important;
        -webkit-overflow-scrolling: touch !important;
        z-index: 1100 !important;
        transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease, visibility 0.2s ease !important;
    }

    .nav-dropdown::before {
        content: '' !important;
        display: block !important;
        width: 38px !important;
        height: 4px !important;
        background: rgba(120, 120, 120, 0.35) !important;
        border-radius: 2px !important;
        margin: 2px auto 8px auto !important;
    }

    html[data-theme="light"] .nav-dropdown {
        background: rgba(255, 255, 255, 0.96) !important;
        border-color: rgba(0, 0, 0, 0.12) !important;
        box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.05) !important;
    }

    /* Strictly open on .open class (NO hover/focus-within ghost triggers on mobile) */
    .nav-group.open .nav-dropdown {
        opacity: 1 !important;
        visibility: visible !important;
        pointer-events: auto !important;
        transform: translateY(0) !important;
    }

    .nav-group[data-group="study"] .nav-dropdown,
    .nav-group[data-group="evaluate"] .nav-dropdown,
    .nav-group[data-group="games"] .nav-dropdown,
    .nav-group[data-group="culture"] .nav-dropdown,
    .nav-group[data-group="progress"] .nav-dropdown,
    .nav-group[data-group="more"] .nav-dropdown {
        left: 8px !important;
        right: 8px !important;
    }

    .nav-dropdown-section-title {
        font-size: 0.72rem !important;
        font-weight: 700 !important;
        text-transform: uppercase !important;
        letter-spacing: 0.08em !important;
        color: var(--primary) !important;
        padding: 12px 14px 4px 14px !important;
        margin-top: 4px !important;
        border-top: 1px solid var(--color-border-subtle, rgba(255, 255, 255, 0.08)) !important;
    }

    .nav-dropdown-section-title:first-of-type {
        margin-top: 0 !important;
        border-top: none !important;
        padding-top: 4px !important;
    }

    /* Mobile Bottom Sheet Header */
    .nav-dropdown-header {
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        padding: 6px 8px 10px 8px !important;
        margin-bottom: 6px !important;
        border-bottom: 1px solid var(--color-border-subtle, rgba(255, 255, 255, 0.08)) !important;
    }

    .nav-dropdown-title {
        display: flex !important;
        align-items: center !important;
        font-size: 0.95rem !important;
        font-weight: 700 !important;
        color: var(--text-main) !important;
    }

    .nav-dropdown-close {
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        width: 36px !important;
        height: 36px !important;
        border-radius: 50% !important;
        background: var(--color-bg-hover, rgba(255, 255, 255, 0.08)) !important;
        border: none !important;
        color: var(--text-muted) !important;
        cursor: pointer !important;
        padding: 0 !important;
        touch-action: manipulation !important;
    }

    .nav-dropdown-close:hover,
    .nav-dropdown-close:active {
        color: var(--text-main) !important;
        background: rgba(255, 255, 255, 0.15) !important;
    }

    /* Mobile Dropdown Items */
    .nav-dropdown-item {
        min-height: 48px !important;
        padding: 11px 14px !important;
        font-size: 0.92rem !important;
        border-radius: var(--radius-md) !important;
        margin-bottom: 3px !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        touch-action: manipulation !important;
    }

    .nav-dropdown-item::after {
        content: '›';
        font-size: 1.3rem;
        font-weight: 400;
        color: var(--text-dim);
        line-height: 1;
        margin-left: auto;
        padding-left: 10px;
    }

    .nav-dropdown-item.active::after {
        content: '✓';
        font-size: 1rem;
        font-weight: 700;
        color: var(--color-accent);
    }

    .nav-dropdown-item:active {
        background: rgba(255, 255, 255, 0.12) !important;
        transform: scale(0.99);
    }

    /* Footer padding on mobile to not be covered by bottom bar */
    .app-footer {
        padding-bottom: calc(76px + var(--safe-area-bottom, 0px)) !important;
    }
}

/* ============================================================================
   TABLET RESPONSIVE NAVIGATION (769px - 1100px)
   ============================================================================ */
@media (min-width: 769px) and (max-width: 1100px) {
    .nav-tabs {
        gap: clamp(6px, 1.4vw, 14px);
        padding: 0 10px;
        overflow-x: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .nav-tabs::-webkit-scrollbar {
        display: none;
    }

    .nav-tab {
        padding: 10px 8px;
        font-size: 0.88rem;
    }

    .nav-tab svg {
        margin-right: 4px;
        width: 15px;
        height: 15px;
    }
}

/* ============================================================================
   PWA SMART INSTALL BANNER & ACTIONS
   ============================================================================ */
.settings-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #ffffff;
    border: none;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast) ease, transform var(--transition-fast) ease;
    touch-action: manipulation;
}

.settings-action-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.pwa-smart-banner {
    position: fixed;
    bottom: calc(60px + var(--safe-area-bottom, 0px) + 10px);
    left: 12px;
    right: 12px;
    z-index: 1050;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: pwaBannerSlideUp 0.3s ease-out;
}

@keyframes pwaBannerSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (min-width: 769px) {
    .pwa-smart-banner {
        left: auto;
        right: 24px;
        bottom: 24px;
        max-width: 380px;
    }
}

.pwa-banner-content {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
}

.pwa-banner-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.pwa-banner-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.pwa-banner-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pwa-banner-desc {
    font-size: 0.76rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pwa-banner-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.pwa-banner-btn {
    padding: 7px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    min-height: 36px;
    touch-action: manipulation;
}

.pwa-banner-dismiss {
    background: transparent;
    border: none;
    color: var(--text-dim);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.pwa-banner-dismiss:hover {
    color: var(--text-main);
    background: var(--color-bg-hover);
}

/* ============================================================================
   IOS INSTALL MODAL DIALOG
   ============================================================================ */
.ios-install-modal {
    border: none;
    border-radius: var(--radius-xl);
    background: transparent;
    padding: 0;
    max-width: 460px;
    width: calc(100vw - 32px);
    box-shadow: var(--shadow-xl);
}

.ios-install-modal::backdrop {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.ios-modal-card {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 24px;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.ios-modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.ios-modal-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.ios-modal-icon {
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.ios-modal-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0 0 4px 0;
    color: var(--text-main);
}

.ios-modal-subtitle {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0;
}

.ios-install-steps {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.ios-step-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    background: var(--color-bg-hover);
    padding: 12px 14px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-subtle);
}

.ios-step-badge {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #ffffff;
    font-size: 0.82rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ios-step-content {
    font-size: 0.88rem;
    line-height: 1.4;
    color: var(--text-main);
    flex: 1;
}

.ios-step-icon-hint {
    margin-top: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: 0.84rem;
    font-weight: 600;
}

.ios-modal-footer {
    display: flex;
    justify-content: flex-end;
}

.ios-modal-footer .btn {
    width: 100%;
    min-height: 44px;
    font-size: 0.95rem;
}

/* ============================================================================
   OFFLINE SYNC STATUS INDICATOR
   ============================================================================ */
.sync-status-indicator {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-muted);
    transition: all var(--transition-fast) ease;
    cursor: default;
    flex-shrink: 0;
}

.sync-status-indicator .sync-icon-check {
    position: absolute;
    bottom: 4px;
    right: 4px;
    color: #22c55e;
    stroke-width: 3;
    transition: opacity var(--transition-fast) ease;
}

.sync-status-indicator.is-offline {
    color: #f59e0b;
}

.sync-status-indicator.is-offline .sync-icon-check {
    opacity: 0;
}

.sync-status-indicator.is-syncing .sync-icon-cloud {
    animation: syncSpin 1.4s linear infinite;
    color: var(--color-primary);
}

.sync-status-indicator.is-syncing .sync-icon-check {
    opacity: 0;
}

@keyframes syncSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.sync-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    background: #f59e0b;
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 8px;
    line-height: 1;
}

/* ==========================================================================
   MEGA-DROPDOWN CULTURA (Desktop & Mobile)
   ========================================================================== */

#nav-dropdown-culture {
    min-width: 580px;
    max-width: 680px;
    padding: 14px 16px;
}

.culture-dropdown-featured {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 10px 14px;
    margin-bottom: 10px;
    border-radius: var(--radius-md, 10px);
    background: rgba(225, 29, 72, 0.08);
    border: 1px solid rgba(225, 29, 72, 0.25);
    color: var(--primary, #e53935);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
}

.culture-dropdown-featured:hover {
    background: rgba(225, 29, 72, 0.15);
    border-color: var(--primary, #e53935);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(225, 29, 72, 0.18);
}

.culture-dropdown-featured .featured-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.culture-dropdown-featured .featured-badge {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--primary, #e53935);
    color: #ffffff;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.culture-dropdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.culture-dropdown-pillar {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md, 8px);
    padding: 4px;
}

html[data-theme="light"] .culture-dropdown-pillar {
    background: rgba(0, 0, 0, 0.02);
}

.culture-dropdown-pillar .nav-dropdown-section-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.74rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary, #e53935);
    padding: 6px 10px 4px;
    margin: 0;
    border-bottom: 1px dashed var(--color-border);
}

.culture-dropdown-pillar .nav-dropdown-item {
    padding: 7px 10px;
    font-size: 0.86rem;
    gap: 8px;
    border-radius: 6px;
}

/* Pillar Specific Color Accents */
.pillar-lang .dropdown-item-icon { color: #e11d48; }
.pillar-geo .dropdown-item-icon { color: #10b981; }
.pillar-arts .dropdown-item-icon { color: #f59e0b; }
.pillar-sci .dropdown-item-icon { color: #8b5cf6; }

/* Responsive adjustments for mobile dropdown */
@media (max-width: 768px) {
    #nav-dropdown-culture {
        min-width: unset;
        max-width: 100%;
        padding: 10px 12px;
    }

    .culture-dropdown-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}