/* Main layout containers */

/* Paper Cutout Theme Variables for Classroom */
:root {
    --paper-bg: #dedede;
    --paper-card: #FFFFFF;
    --paper-outline: #2D3436;
    --paper-shadow: #b0b0b0;
    --paper-primary: #E17055;
    --paper-primary-hover: #D35E45;
    --paper-text: #2D3436;
    --paper-text-muted: #636E72;
    --paper-border-radius: 12px;
    --paper-border-radius-sm: 8px;
}

/* Header Controls - Left */
#header-left {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 10001;
    display: flex;
    gap: 10px;
}

/* Header Controls - Right */
#header-right {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 10001;
    display: flex;
    gap: 10px;
}

/* Header Button Styles - Paper Cutout Theme */
.header-btn,
#menu-button,
#fullscreen-button {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--paper-card);
    border: 2px solid var(--paper-outline);
    border-radius: var(--paper-border-radius-sm);
    color: var(--paper-text);
    cursor: pointer;
    transition: all 0.15s ease;
    box-shadow: 2px 2px 0 var(--paper-shadow);
    text-decoration: none;
}

.header-btn:hover,
#menu-button:hover,
#fullscreen-button:hover {
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 var(--paper-shadow);
    background: var(--paper-card);
    color: var(--paper-primary);
}

.header-btn:active,
#menu-button:active,
#fullscreen-button:active {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 var(--paper-shadow);
}

.header-btn i,
#menu-button i,
#fullscreen-button i {
    font-size: 18px;
}

/* Drawing mode active state */
#drawing-toggle-btn.active,
#drawing-toggle-btn.drawing-active {
    background: var(--paper-primary) !important;
    color: white !important;
}

/* Menu Dropdown */
#menu-dropdown {
    position: fixed;
    top: 70px;
    left: 16px;
    background: var(--paper-card);
    border: 2px solid var(--paper-outline);
    border-radius: var(--paper-border-radius);
    box-shadow: 3px 3px 0 var(--paper-shadow);
    min-width: 200px;
    z-index: 10002;
    overflow: hidden;
}

#menu-dropdown.hidden {
    display: none;
}

#menu-dropdown button {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-bottom: 1px solid #eee;
    color: var(--paper-text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
    text-align: left;
}

#menu-dropdown button:last-child {
    border-bottom: none;
}

#menu-dropdown button:hover {
    background: #f5f5f5;
}

#menu-dropdown button i {
    width: 20px;
    color: var(--paper-primary);
}

#main-content {
    text-align: center;
    padding: 0 20px 60px 20px;
    /* Changed from overflow: hidden to visible to prevent tools from being cut off */
    overflow: visible;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#tool-container {
    /* This container should not constrain tools, only serve as a visual reference */
    margin: 0 auto;
    width: 90%;
    max-width: 1200px;
    position: relative;
    z-index: 0;
    pointer-events: none; /* Allow clicking through to the content beneath */
    min-height: 500px;
    border: 1px solid transparent; /* Invisible border for debugging only */
}

/* Fixed bottom toolbar */
#toolbar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(
        135deg, 
        rgba(76, 175, 80, 0.95) 0%, 
        rgba(102, 187, 106, 0.95) 50%, 
        rgba(129, 199, 132, 0.95) 100%
    );
    backdrop-filter: blur(20px) saturate(180%);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 8px 6px;
    z-index: 1000;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    border-image: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent) 1;
    /* Performance: isolate toolbar from animated backgrounds */
    isolation: isolate;
    contain: layout style paint;
}

/* Responsive layout adjustments */
@media (max-width: 768px) {
    #tool-container {
        width: 95%;
        gap: 10px;
    }
    
    #toolbar {
        flex-wrap: wrap;
        padding: 6px 4px;
        gap: 2px;
    }
    
    #toolbar button {
        flex: 1 1 auto;
        margin: 1px;
        min-width: 60px;
        padding: 6px 8px;
        font-size: 0.7em;
    }
}