/* ═══════════════════════════════════════════════════════════════════════════
   XFS Manager — Layout (MEGA.nz-inspired 3-panel)
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Login Screen ─── */
.login-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    background: var(--bg-primary);
}

.login-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    background: var(--gradient-hero);
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: orbFloat 20s ease-in-out infinite;
}
.orb-1 {
    width: 500px; height: 500px;
    background: var(--accent-primary);
    top: -10%; left: -10%;
    animation-delay: 0s;
}
.orb-2 {
    width: 400px; height: 400px;
    background: var(--accent-secondary);
    bottom: -10%; right: -10%;
    animation-delay: -7s;
}
.orb-3 {
    width: 300px; height: 300px;
    background: #8b5cf6;
    top: 40%; left: 50%;
    animation-delay: -14s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(50px, -30px) scale(1.1); }
    66% { transform: translate(-30px, 50px) scale(0.9); }
}

.particle-field {
    position: absolute;
    inset: 0;
}

.login-card {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 420px;
    padding: var(--sp-10);
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.login-logo {
    text-align: center;
    margin-bottom: var(--sp-8);
}
.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px; height: 64px;
    border-radius: var(--radius-lg);
    background: var(--gradient-accent);
    color: white;
    font-size: 28px;
    margin-bottom: var(--sp-4);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
}
.login-title {
    font-size: var(--fs-3xl);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.login-title .accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.login-subtitle {
    color: var(--text-tertiary);
    font-size: var(--fs-sm);
    margin-top: var(--sp-1);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
}

.input-group {
    position: relative;
}
.input-icon {
    position: absolute;
    left: var(--sp-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: 18px;
    pointer-events: none;
    transition: color var(--transition-fast);
    z-index: 2;
}
.input-group input {
    width: 100%;
    padding: var(--sp-3) var(--sp-4) var(--sp-3) 44px;
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    outline: none;
    transition: all var(--transition-fast);
}
.input-group input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-primary-muted);
}
.input-group input:focus + .input-glow {
    opacity: 1;
}
.input-group:focus-within .input-icon {
    color: var(--accent-primary);
}
.input-glow {
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-md);
    background: var(--gradient-accent);
    opacity: 0;
    z-index: -1;
    filter: blur(8px);
    transition: opacity var(--transition-base);
}

.login-error {
    color: var(--danger);
    font-size: var(--fs-sm);
    text-align: center;
    min-height: 1.5em;
}

/* ─── Telegram Login Widget ─── */
.tg-login-section {
    margin-top: var(--sp-4);
}
.login-divider {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    margin: var(--sp-4) 0;
    color: var(--text-muted);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-primary);
}
.tg-widget-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-2) 0;
    min-height: 44px;
}
.tg-widget-container iframe {
    border-radius: var(--radius-md) !important;
    max-width: 100%;
    color-scheme: light;
}

/* Manual Telegram login (fallback when widget iframe fails) */
.btn-telegram-manual {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    background: #54a9eb;
    color: #fff;
    border-radius: var(--radius-md);
    font-size: var(--fs-md);
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
    cursor: pointer;
}
.btn-telegram-manual:hover {
    background: #3b96de;
    transform: translateY(-1px);
}
.btn-telegram-manual:active {
    transform: translateY(0);
}
.tg-manual-hint {
    margin-top: var(--sp-2);
    font-size: var(--fs-xs);
    color: var(--text-muted);
    text-align: center;
}
.tg-manual-hint code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}

/* ─── App Layout ─── */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--bg-primary);
}

/* ─── Top Bar ─── */
.topbar {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    padding: 0 var(--sp-4);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    z-index: 100;
    flex-shrink: 0;
}
.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    min-width: 180px;
}
.topbar-center {
    flex: 1;
    display: flex;
    justify-content: center;
}
.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    min-width: 180px;
    justify-content: flex-end;
}
.topbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-primary);
    margin: 0 var(--sp-2);
}

.logo-sm {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-weight: 700;
    font-size: var(--fs-lg);
    color: var(--text-primary);
}
.logo-sm i {
    color: var(--accent-primary);
    font-size: 22px;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    padding: var(--sp-2) var(--sp-4);
    width: 100%;
    max-width: 520px;
    transition: all var(--transition-fast);
}
.search-bar:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-primary-muted);
}
.search-bar i {
    color: var(--text-tertiary);
    font-size: 16px;
}
.search-bar input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: var(--fs-sm);
}
.search-bar kbd {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    border: 1px solid var(--border-primary);
}

/* ─── Main Layout (Sidebar + Content) ─── */
.main-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    flex: 1;
    overflow: hidden;
    transition: grid-template-columns var(--transition-base);
}
.main-layout.sidebar-collapsed {
    grid-template-columns: 0 1fr;
}

/* ─── Sidebar ─── */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all var(--transition-base);
}
.sidebar-collapsed .sidebar {
    width: 0;
    visibility: hidden;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--sp-3);
}

.nav-section {
    margin-bottom: var(--sp-4);
}
.nav-section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--fs-xs);
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--sp-2) var(--sp-3);
    margin-bottom: var(--sp-1);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    font-size: var(--fs-sm);
    font-weight: 500;
    user-select: none;
}
.nav-item i {
    font-size: 18px;
    width: 20px;
    text-align: center;
}
.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--accent-primary-muted);
    color: var(--accent-primary);
}
.nav-item .badge {
    margin-left: auto;
    background: var(--accent-primary);
    color: white;
    font-size: var(--fs-xs);
    font-weight: 600;
    padding: 1px 8px;
    border-radius: var(--radius-full);
    min-width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: var(--sp-4);
    border-top: 1px solid var(--border-primary);
}
.storage-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--sp-2);
}
.storage-fill {
    height: 100%;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}
.storage-text {
    font-size: var(--fs-xs);
    color: var(--text-tertiary);
}

/* ─── Content ─── */
.content {
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--sp-6);
    background: var(--bg-primary);
}

/* ─── User menu dropdown ─── */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    cursor: pointer;
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--radius-md);
    position: relative;
    transition: background var(--transition-fast);
}
.user-menu:hover {
    background: var(--bg-hover);
}
.avatar {
    width: 32px; height: 32px;
    border-radius: var(--radius-full);
    background: var(--accent-primary-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}
.username {
    font-size: var(--fs-sm);
    font-weight: 500;
}
.user-menu .dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--sp-2);
    min-width: 180px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    padding: var(--sp-1);
}
.user-menu.open .dropdown {
    display: block;
}
.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: var(--fs-sm);
    transition: all var(--transition-fast);
}
.dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.dropdown-item i { font-size: 16px; }

/* ─── Sort dropdown ─── */
.sort-dropdown {
    position: relative;
}
.sort-dropdown .dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--sp-1);
    min-width: 160px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    padding: var(--sp-1);
}
.sort-dropdown.open .dropdown {
    display: block;
}

/* ─── Folder tree ─── */
.folder-tree {
    max-height: 200px;
    overflow-y: auto;
}
.folder-tree-item {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-1) var(--sp-3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}
.folder-tree-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.folder-tree-item .folder-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   MOBILE RESPONSIVE — Sidebar overlay, collapsible, smaller stat cards
   ═══════════════════════════════════════════════════════════════════════════ */

/* Sidebar backdrop overlay (mobile) */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 149;
    opacity: 0;
    transition: opacity var(--transition-base);
}
.sidebar-backdrop.visible {
    display: block;
    opacity: 1;
}

/* ─── Tablet: ≤ 1024px ─── */
@media (max-width: 1024px) {
    .topbar-left { min-width: auto; }
    .topbar-right { min-width: auto; }
    .search-bar { max-width: 360px; }
    .search-bar kbd { display: none; }
}

/* ─── Mobile: ≤ 768px ─── */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }

    /* Sidebar becomes overlay */
    .main-layout {
        grid-template-columns: 1fr !important;
    }
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: var(--sidebar-width);
        z-index: 150;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        box-shadow: none;
    }
    .main-layout.sidebar-open .sidebar,
    .sidebar.mobile-open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }
    /* Overlay the sidebar-collapsed class so it doesn't break mobile */
    .main-layout.sidebar-collapsed {
        grid-template-columns: 1fr !important;
    }

    /* Topbar adjustments */
    .topbar {
        padding: 0 var(--sp-2);
        gap: var(--sp-2);
    }
    .topbar-left {
        min-width: auto;
        gap: var(--sp-2);
    }
    .topbar-center {
        flex: 1;
        min-width: 0;
    }
    .topbar-right {
        min-width: auto;
        gap: var(--sp-1);
    }
    .search-bar {
        max-width: none;
        padding: var(--sp-1) var(--sp-3);
    }
    .search-bar kbd { display: none; }
    .topbar-divider { display: none; }
    .username { display: none; }
    .user-menu .lucide-chevron-down { display: none; }

    /* Content */
    .content {
        padding: var(--sp-3);
    }

    /* Selection bar */
    .selection-bar {
        flex-wrap: wrap;
        gap: var(--sp-2);
    }
    .selection-actions {
        flex-wrap: wrap;
        gap: var(--sp-1);
    }
}

/* ─── Small Mobile: ≤ 480px ─── */
@media (max-width: 480px) {
    .topbar {
        height: 48px;
        padding: 0 var(--sp-2);
    }
    .logo-sm span { display: none; }
    .logo-sm i { font-size: 20px; }
    .search-bar {
        padding: var(--sp-1) var(--sp-2);
        font-size: var(--fs-xs);
    }
    .search-bar i { font-size: 14px; }
    .content {
        padding: var(--sp-2);
    }
    #btn-sync { display: none; }
}