/* Overlays */
#bottom-sheet-backdrop {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: var(--overlay-bg); z-index: 1000; opacity: 0; transition: opacity 0.3s;
}
#bottom-sheet-backdrop.open { display: block; opacity: 1; }

.palette-popup {
    position: absolute; bottom: 70px; right: 1rem;
    background: var(--card-bg); z-index: 1001;
    border-radius: var(--radius-xl); border: 1px solid var(--border-color);
    padding: 0.75rem; width: auto;
    box-shadow: var(--shadow-lg);
    display: none; flex-direction: column; gap: 0.25rem;
}
.palette-popup.open { display: flex; }

#fps-modal {
    bottom: 50%;
    right: 50%;
    transform: translate(50%, 50%);
    width: 280px;
}

.fps-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.fps-opt {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.6rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
}

.fps-opt:hover {
    background-color: var(--hover-bg);
}

body.dark-mode .fps-opt:hover {
    background-color: var(--hover-bg);
}

.fps-opt.selected {
    background-color: var(--primary-color);
    color: var(--color-white);
    border-color: var(--primary-color);
}

.sheet-palette { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.75rem; justify-content: center; }
.sheet-color-opt { 
    width: 32px; height: 32px; border-radius: 50%; cursor: pointer; 
    border: 2px solid transparent; transition: transform 0.1s;
}
.sheet-color-opt.selected { border-color: var(--text-color); transform: scale(1.1); }

#overflow-menu {
    position: absolute; top: 50px; right: 1rem;
    background: var(--card-bg); z-index: 1001;
    border-radius: var(--radius-xl); border: 1px solid var(--border-color);
    padding: 0.5rem; width: 220px;
    box-shadow: var(--shadow-lg);
    display: none; flex-direction: column; gap: 0.25rem;
    overflow: hidden;
}
#overflow-menu.open { display: flex; }

.dropdown-menu {
    position: absolute; top: 100%; right: 0;
    background: var(--card-bg); z-index: 1001;
    border-radius: var(--radius-lg); border: 1px solid var(--border-color);
    padding: 0.25rem; width: 180px;
    box-shadow: var(--shadow-lg);
    display: none; flex-direction: column; gap: 0.1rem;
    margin-top: 0.5rem;
}
.dropdown-menu.open { display: flex; }
.dropdown-menu .menu-item {
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
    border-radius: var(--radius-md);
}

.menu-item {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.75rem; border-radius: var(--radius-lg);
    cursor: pointer; transition: background 0.2s;
    color: var(--text-color);
}

/* Guest Mode Restrictions */
body.guest-mode #sidebar { display: none !important; }
body.guest-mode #sidebar-open { display: none !important; }
body.guest-mode #logout-btn { display: none !important; }
body.guest-mode #mobile-logout { display: none !important; }
body.guest-mode #app-body { width: 100%; margin-left: 0; }
body.guest-mode .session-actions { display: none !important; }
body.guest-mode #overflow-menu-toggle { display: block !important; }
body.guest-mode .desktop-only:not(#theme-toggle):not(#export-btn) { display: none !important; }
.menu-item:hover { background: var(--hover-bg); }
body.dark-mode .menu-item:hover { background: var(--hover-bg); }
.menu-item .icon { display: flex; align-items: center; color: var(--primary-color); }
.menu-item .label { font-size: 0.9rem; }

#overflow-menu-toggle { 
    background: none; border: none;
    font-size: 1.5rem; 
    cursor: pointer; 
    padding: 0; 
    color: var(--text-color); 
    display: grid; 
    place-items: center;
    height: var(--header-height);
}

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

@media (max-width: 768px) {
    body { flex-direction: column; height: 100%; }
    .desktop-only { display: none !important; }
    .mobile-only { display: flex !important; }
    .mobile-only.hidden { display: none !important; }
    
    #header-session-title { 
        display: block; 
        position: static; 
        transform: none; 
        max-width: 100%; 
        padding-right: 0.5rem;
        line-height: 1.2;
    }
    #overflow-menu-toggle { display: grid; place-items: center; padding: 0; }
    #sidebar-open { display: grid; place-items: center; padding: 0; }
    #live-clock { line-height: 1; }
    
    #sidebar {
        position: fixed; left: 0; top: 0; bottom: 0; z-index: 2000;
        transform: translateX(-100%); width: 280px;
        box-shadow: var(--shadow-sidebar);
        height: 100%;
        background: var(--bg-color);
    }
    #sidebar.open { transform: translateX(0); }
    .sidebar-content { border-right: none; }
    
    #app-body { width: 100%; }
    
    .sidebar-top-actions .action-btn { 
        min-height: 44px; 
        box-sizing: border-box;
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        line-height: 1;
    }
    
    .sidebar-top-actions #manage-sessions-btn.active {
        background-color: var(--surface-muted);
        color: var(--text-muted-dark);
    }

    .session-actions { display: none; opacity: 1; }
    #sidebar.managing .session-actions { display: flex; }
    .session-actions .sess-edit-btn { color: var(--primary-color); }
    .session-actions .sess-delete-btn { color: #ff4d4d; }

    /* Ensure session name takes full width when icons are hidden */
    .session-item { height: var(--session-item-height); box-sizing: border-box; align-items: center; }
    .session-item .session-name { max-width: 100%; transition: max-width 0.2s; }
    
    .note { grid-template-columns: 80px 1fr; gap: 0.5rem; padding: 0.5rem; }
    .note .timestamp { font-size: 0.75rem; padding-right: 0.25rem; }
    .note-actions { display: none; grid-column: 2; justify-content: flex-start; padding-top: 0.35rem; }
    .note.editing .note-actions { display: flex; }
    .note.editing .note-actions .delete-btn { display: inline-flex; }
    .note.delete-confirm .note-actions { display: flex; }

    #mobile-color-toggle {
        display: flex; align-items: center; justify-content: center;
        width: 38px; height: 38px; border-radius: 50%; cursor: pointer;
        border: 1px solid var(--border-color); background-color: var(--selected-color, var(--surface-muted));
        color: var(--text-muted-dark); flex-shrink: 0; box-shadow: var(--shadow-sm);
    }
    body.dark-mode #mobile-color-toggle {
        background-color: var(--selected-color, var(--surface-muted-dark));
    }
    #mobile-color-toggle svg { width: 20px; height: 22px; }
    
    #palette { display: none; }
    #sidebar-open { display: grid; place-items: center; }
    #note-stream { padding: 0.5rem; gap: 0.25rem; }

    /* Recent Sessions List (mobile only) */
    #recent-sessions-list {
        padding: 0.5rem;
        margin-top: 2rem;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
        overflow-x: hidden;
        overflow-y: auto;
        align-items: center;
        max-width: 100vw;
        box-sizing: border-box;
    }

    .recent-session-item {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.75rem;
        background-color: var(--card-bg);
        border-radius: var(--radius-lg);
        cursor: pointer;
        transition: background-color 0.2s;
        min-height: 44px;
        width: 100%;
        max-width: 320px;
        box-sizing: border-box;
    }

    .recent-session-item:active {
        background-color: var(--hover-bg);
    }

    .recent-session-time {
        font-size: 0.75rem;
        color: var(--secondary-color);
        flex-shrink: 0;
        min-width: 3ch;
        text-align: right;
    }

    .recent-session-name {
        flex: 1;
        font-size: 0.9rem;
        font-weight: 500;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        min-width: 0;
    }

    .recent-session-indicators {
        display: flex;
        align-items: center;
        gap: 0.35rem;
        flex-shrink: 0;
    }

    .recent-user-count {
        display: flex;
        align-items: center;
        gap: 2px;
        font-size: 0.7rem;
        color: var(--secondary-color);
        background-color: var(--hover-bg-strong);
        padding: 2px 6px;
        border-radius: var(--radius-pill-half);
    }

    .recent-user-count svg {
        flex-shrink: 0;
    }

    #welcome-message {
        display: block !important;
        font-size: 1.2rem;
        font-weight: 700;
        color: var(--primary-color);
        text-align: center;
        margin-top: 2rem;
        margin-bottom: 0;
    }

    #new-session-btn-empty {
        margin: 2rem auto 0;
        padding: 0.6rem 1.2rem;
        background-color: var(--primary-color);
        color: white;
        border: none;
        border-radius: var(--radius-md);
        font-size: 0.9rem;
        font-weight: 600;
        cursor: pointer;
        min-height: 44px;
        transition: background-color 0.2s, transform 0.1s;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    #new-session-btn-empty:active {
        transform: scale(0.98);
    }
}