/**
 * ==============================================================================
 * SADRA VISUALS — ARTBOOK PHOTOGRAPHY GALLERY DESIGN SYSTEM
 * LAYER 5.4: RESPONSIVE MOBILE & TABLET HAMBURGER NAVIGATION
 * ==============================================================================
 * Roadmap Feature 1.11:
 * 1. Breakpoint coverage: Activates on screens <= 1024px (tablets & smartphones)
 * 2. Animated dual SVG toggle button with 44px minimum touch target
 * 3. Slide-down obsidian blurred glass sheet (backdrop-filter: blur(28px))
 * 4. Full-width 48px ergonomic touch cards (Inquire, Sessions, Login)
 * 5. Circular 44px social link buttons (Instagram, Email, X, Telegram, Website)
 * 6. Smooth dismissal ergonomics (click outside, Escape, resize > 1024px, nav select)
 * 7. Notch & safe-area boundary protection
 */

/* ==============================================================================
   1. DESKTOP BASELINE (> 1024px)
   ============================================================================== */
.mobile-nav-toggle-btn {
    display: none !important;
}

.mobile-nav-sheet {
    display: none;
}

.mobile-nav-backdrop {
    display: none;
}

/* ==============================================================================
   2. TABLET & MOBILE VIEWPORT MATRIX (<= 1024px)
   ============================================================================== */
@media (max-width: 1024px) {
    /* Hide desktop links on tablets and smartphones */
    .main-nav {
        display: none !important;
    }

    /* Move Client and Studio Login pills from top header into hamburger menu */
    .client-portal-pill,
    .admin-login-pill {
        display: none !important;
    }

    /* 44px Ergonomic Hamburger Toggle Button */
    .mobile-nav-toggle-btn {
        display: inline-flex !important;
        position: relative;
        width: var(--min-tap-target, 44px);
        height: var(--min-tap-target, 44px);
        min-width: 44px;
        min-height: 44px;
        border-radius: var(--radius-pill, 9999px);
        background: var(--bg-card, #0f131a);
        border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.08));
        color: var(--text-primary, #ffffff);
        cursor: pointer;
        padding: 0;
        align-items: center;
        justify-content: center;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
        transition: background var(--transition-fast, 0.2s ease), border-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
        overflow: hidden;
        flex-shrink: 0;
    }

    .mobile-nav-toggle-btn:hover {
        background: var(--bg-card-hover, #161b24);
        border-color: var(--border-active, rgba(212, 175, 55, 0.4));
        color: var(--accent-gold, #d4af37);
    }

    /* Dual SVG Animated Transition (Menu <=> Close) */
    .nav-toggle-icon {
        position: absolute;
        width: 22px;
        height: 22px;
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
        pointer-events: none;
    }

    .nav-toggle-icon.icon-menu {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }

    .nav-toggle-icon.icon-close {
        opacity: 0;
        transform: rotate(-90deg) scale(0.6);
    }

    /* Active / Open State for Toggle Button */
    .mobile-nav-toggle-btn.is-open,
    #site-header.mobile-nav-open .mobile-nav-toggle-btn {
        background: var(--bg-card-hover, #161b24);
        border-color: var(--accent-gold, #d4af37);
        color: var(--accent-gold, #d4af37);
        box-shadow: 0 0 16px rgba(212, 175, 55, 0.2);
    }

    .mobile-nav-toggle-btn.is-open .icon-menu,
    #site-header.mobile-nav-open .mobile-nav-toggle-btn .icon-menu {
        opacity: 0;
        transform: rotate(90deg) scale(0.6);
    }

    .mobile-nav-toggle-btn.is-open .icon-close,
    #site-header.mobile-nav-open .mobile-nav-toggle-btn .icon-close {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }

    /* Backdrop Dimming & Blur Overlay */
    .mobile-nav-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(4, 6, 10, 0.82);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        z-index: calc(var(--z-header, 100) - 2);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s ease;
    }

    .mobile-nav-backdrop.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    /* Slide-Down Blurred Glass Sheet */
    .mobile-nav-sheet {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        background: rgba(10, 13, 18, 0.94);
        backdrop-filter: blur(28px);
        -webkit-backdrop-filter: blur(28px);
        border-bottom: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.08));
        box-shadow: 0 24px 48px -4px rgba(0, 0, 0, 0.75), 0 8px 16px rgba(0, 0, 0, 0.4);
        z-index: calc(var(--z-header, 100) - 1);
        max-height: calc(100vh - var(--header-height, 64px) - env(safe-area-inset-top, 0px) - 24px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px);
        pointer-events: none;
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease, visibility 0.3s;
    }

    .mobile-nav-sheet.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }
}

/* ==============================================================================
   3. INTERNAL SHEET LAYOUT & TOUCH ERGONOMICS
   ============================================================================== */
.mobile-nav-inner {
    padding: 20px clamp(12px, 3.5vw, 24px) max(28px, env(safe-area-inset-bottom, 0px)) clamp(12px, 3.5vw, 24px);
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 760px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.mobile-nav-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    box-sizing: border-box;
}

.mobile-nav-section-title {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim, #64748b);
    padding: 0 4px;
}

.mobile-nav-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0 4px;
    box-sizing: border-box;
}

.mobile-nav-header-row .mobile-nav-section-title {
    padding: 0;
}

.mobile-discreet-login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    padding: 0;
    border-radius: var(--radius-pill, 9999px);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-dim, #64748b);
    opacity: 0.45;
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

.mobile-discreet-login:hover,
.mobile-discreet-login:focus-visible {
    opacity: 1;
    color: var(--accent-gold, #d4af37);
    border-color: rgba(212, 175, 55, 0.25);
    background: rgba(212, 175, 55, 0.08);
}

.mobile-discreet-login.is-authenticated {
    opacity: 0.85;
    color: var(--accent-gold, #d4af37);
}

/* Primary View Links Grid (3-Column Layout) */
.mobile-nav-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
    box-sizing: border-box;
}

.mobile-nav-view-link {
    min-height: 44px;
    padding: 10px 8px;
    border-radius: var(--radius-md, 10px);
    background: var(--bg-card, #0f131a);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.08));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: clamp(0.74rem, 2.3vw, 0.88rem);
    font-weight: 500;
    color: var(--text-muted, #94a3b8);
    text-decoration: none;
    transition: all 0.2s ease;
    box-sizing: border-box;
    touch-action: manipulation;
}

.mobile-nav-view-link:hover {
    color: var(--text-primary, #ffffff);
    background: var(--bg-card-hover, #161b24);
    border-color: var(--border-active, rgba(212, 175, 55, 0.4));
}

.mobile-nav-view-link.active {
    color: var(--text-primary, #ffffff);
    background: var(--bg-card-hover, #161b24);
    border-color: var(--accent-gold, #d4af37);
    box-shadow: 0 0 16px rgba(212, 175, 55, 0.15);
}

.mobile-view-bullet {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-dim, #64748b);
    transition: background 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
}

.mobile-nav-view-link.active .mobile-view-bullet {
    background: var(--accent-gold, #d4af37);
    box-shadow: 0 0 8px var(--accent-gold, #d4af37);
}

.mobile-view-label {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==============================================================================
   4. FULL-WIDTH 48PX TOUCH ACTION CARDS
   ============================================================================== */
.mobile-nav-cards {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    box-sizing: border-box;
}

.mobile-action-card {
    min-height: 48px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-md, 12px);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.08));
    text-decoration: none;
    color: var(--text-primary, #ffffff);
    cursor: pointer;
    text-align: left;
    width: 100%;
    box-sizing: border-box;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.mobile-action-card:hover,
.mobile-action-card:active {
    background: rgba(255, 255, 255, 0.07);
    border-color: var(--border-active, rgba(212, 175, 55, 0.4));
    transform: translateY(-1px);
}

.mobile-card-icon-wrap {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.06));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-gold, #d4af37);
    flex-shrink: 0;
}

.mobile-card-icon-wrap svg {
    width: 18px;
    height: 18px;
}

.mobile-card-content {
    flex: 1 1 auto;
    min-width: 0;
}

.mobile-card-title {
    font-family: var(--font-display, "Space Grotesk", sans-serif);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary, #ffffff);
    line-height: 1.25;
}

.mobile-card-sub {
    font-size: 0.76rem;
    color: var(--text-muted, #94a3b8);
    line-height: 1.35;
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mobile-card-arrow {
    color: var(--text-dim, #64748b);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.2s ease, color 0.2s ease;
}

.mobile-card-arrow svg {
    width: 18px;
    height: 18px;
}

.mobile-action-card:hover .mobile-card-arrow {
    color: var(--accent-gold, #d4af37);
    transform: translateX(3px);
}

/* ==============================================================================
   5. COMPACT BREAKPOINTS (< 480px & < 380px)
   ============================================================================== */
@media (max-width: 480px) {
    .mobile-card-sub {
        font-size: 0.72rem;
    }
}

@media (max-width: 380px) {
    .mobile-nav-grid {
        gap: 5px;
    }

    .mobile-nav-view-link {
        padding: 8px 4px;
        gap: 4px;
        font-size: 0.70rem;
    }

    .mobile-view-bullet {
        width: 5px;
        height: 5px;
    }

    .mobile-card-content {
        padding-right: 4px;
    }
}

/* ==============================================================================
   6. DUAL-THEME LIGHT MODE SUPPORT ([data-theme="light"], .theme-light)
   ============================================================================== */
[data-theme="light"] .mobile-nav-toggle-btn,
.theme-light .mobile-nav-toggle-btn {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.12);
    color: #1e293b;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .mobile-nav-toggle-btn:hover,
.theme-light .mobile-nav-toggle-btn:hover {
    background: #f8fafc;
    border-color: var(--accent-gold, #b38914);
    color: var(--accent-gold, #b38914);
}

[data-theme="light"] .mobile-nav-toggle-btn.is-open,
[data-theme="light"] #site-header.mobile-nav-open .mobile-nav-toggle-btn,
.theme-light .mobile-nav-toggle-btn.is-open,
.theme-light #site-header.mobile-nav-open .mobile-nav-toggle-btn {
    background: #ffffff;
    border-color: var(--accent-gold, #b38914);
    color: var(--accent-gold, #b38914);
    box-shadow: 0 0 14px rgba(179, 137, 20, 0.25);
}

/* Backdrop Overlay */
[data-theme="light"] .mobile-nav-backdrop,
.theme-light .mobile-nav-backdrop {
    background: rgba(15, 23, 42, 0.32);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Slide-Down Blurred Glass Sheet */
[data-theme="light"] .mobile-nav-sheet,
.theme-light .mobile-nav-sheet {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 20px 48px -4px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.04);
}

/* Section Title & Header Row */
[data-theme="light"] .mobile-nav-section-title,
.theme-light .mobile-nav-section-title {
    color: #64748b;
    font-weight: 700;
}

[data-theme="light"] .mobile-discreet-login,
.theme-light .mobile-discreet-login {
    color: #64748b;
    opacity: 0.6;
}

[data-theme="light"] .mobile-discreet-login:hover,
[data-theme="light"] .mobile-discreet-login:focus-visible,
.theme-light .mobile-discreet-login:hover,
.theme-light .mobile-discreet-login:focus-visible {
    opacity: 1;
    color: var(--accent-gold, #b38914);
    border-color: rgba(179, 137, 20, 0.3);
    background: rgba(179, 137, 20, 0.1);
}

[data-theme="light"] .mobile-discreet-login.is-authenticated,
.theme-light .mobile-discreet-login.is-authenticated {
    opacity: 1;
    color: var(--accent-gold, #b38914);
}

/* Primary Navigation View Links */
[data-theme="light"] .mobile-nav-view-link,
.theme-light .mobile-nav-view-link {
    background: #f1f5f9;
    border: 1px solid rgba(0, 0, 0, 0.08);
    color: #475569;
}

[data-theme="light"] .mobile-nav-view-link:hover,
.theme-light .mobile-nav-view-link:hover {
    color: #0f172a;
    background: #ffffff;
    border-color: rgba(179, 137, 20, 0.5);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .mobile-nav-view-link.active,
.theme-light .mobile-nav-view-link.active {
    color: #0f172a;
    background: #ffffff;
    border-color: var(--accent-gold, #b38914);
    box-shadow: 0 2px 12px rgba(179, 137, 20, 0.2);
}

[data-theme="light"] .mobile-view-bullet,
.theme-light .mobile-view-bullet {
    background: #94a3b8;
}

[data-theme="light"] .mobile-nav-view-link.active .mobile-view-bullet,
.theme-light .mobile-nav-view-link.active .mobile-view-bullet {
    background: var(--accent-gold, #b38914);
    box-shadow: 0 0 6px var(--accent-gold, #b38914);
}

/* 48px Action Cards */
[data-theme="light"] .mobile-action-card,
.theme-light .mobile-action-card {
    background: #f8fafc;
    border: 1px solid rgba(0, 0, 0, 0.08);
    color: #0f172a;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .mobile-action-card:hover,
[data-theme="light"] .mobile-action-card:active,
.theme-light .mobile-action-card:hover,
.theme-light .mobile-action-card:active {
    background: #ffffff;
    border-color: var(--accent-gold, #b38914);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .mobile-card-icon-wrap,
.theme-light .mobile-card-icon-wrap {
    background: rgba(179, 137, 20, 0.08);
    border: 1px solid rgba(179, 137, 20, 0.2);
    color: var(--accent-gold, #b38914);
}

[data-theme="light"] .mobile-card-title,
.theme-light .mobile-card-title {
    color: #0f172a;
}

[data-theme="light"] .mobile-card-sub,
.theme-light .mobile-card-sub {
    color: #64748b;
}

[data-theme="light"] .mobile-card-arrow,
.theme-light .mobile-card-arrow {
    color: #94a3b8;
}

[data-theme="light"] .mobile-action-card:hover .mobile-card-arrow,
.theme-light .mobile-action-card:hover .mobile-card-arrow {
    color: var(--accent-gold, #b38914);
}