:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --glass-bg: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary-color: #3b82f6;
    --hover-color: #60a5fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent; /* Remove blue highlight on tap */
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Prevent text selection */
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    background: radial-gradient(circle at 50% 50%, #1e293b 0%, #0f172a 100%);
    color: var(--text-color);
    overflow: hidden; /* Prevent scrolling */
    width: 100vw;
    height: 100vh;
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    user-select: none; /* Prevent text selection popup on long press */
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    touch-action: none; /* Block native gestures on touch screens hitting the canvas */
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1), width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body.panel-active #canvas-container {
    left: 400px;
    width: calc(100% - 400px);
}

#ui-container {
    position: absolute;
    top: 2rem;
    left: 2rem;
    z-index: 10;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    pointer-events: auto;
    touch-action: pan-y;
}

#canvas-actions {
    position: absolute;
    bottom: 2rem;
    left: calc(50% + 160px); /* Center in remaining space (320px panel) */
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 100;
    transition: left 0.4s ease;
    touch-action: none;
}

/* Hide other controls when panel is active for maximum visibility */
body.panel-active #top-nav,
body.panel-active #canvas-actions {
    display: none !important;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

.controls {
    display: flex;
    gap: 1rem;
}

button {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

button.disabled, button[disabled] {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    transform: none !important;
    box-shadow: none !important;
}

.mobile-toggle-btn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    z-index: 1000;
    cursor: pointer;
    justify-content: center;
    align-items: center;
    touch-action: none;
}

@media (max-width: 768px) {
    .mobile-toggle-btn {
        display: flex;
        bottom: 210px; 
    }
    body {
        height: 100svh;
    }
    #ui-container {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        border-radius: 1rem 1rem 0 0;
        max-height: 55svh;
        overflow-y: auto;
        padding: 1.2rem;
        transform: translateY(150%);
        transition: transform 0.3s ease;
    }
    body.panel-active #ui-container {
        transform: translateY(0);
    }
    #canvas-container {
        height: 100svh; 
        transition: height 0.3s ease;
    }
    body.panel-active #canvas-container {
        height: 40svh; 
        left: 0;
        width: 100%;
    }
    /* Mobile-specific override to hide actions when panel is active */
    body.panel-active #top-nav,
    body.panel-active #canvas-actions {
        display: none !important;
    }
    #canvas-actions {
        bottom: 80px;
        display: grid !important;
        grid-template-columns: 1fr 1fr !important;
        gap: 0.8rem;
        width: 90%;
        left: 50%;
        transform: translateX(-50%);
        z-index: 1000;
    }
    #canvas-actions button {
        padding: 0.8rem 0.5rem;
        font-size: 0.85rem;
        white-space: nowrap;
        justify-content: center;
        width: 100%;
    }
    #speed-ctrl-floating {
        bottom: 180px !important;
        min-width: 200px;
    }
}

#floating-top-controls {
    position: fixed;
    top: 20px;
    left: calc(50% + 160px); /* Center in remaining space */
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    transition: left 0.4s ease;
}

.top-row {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
}

#zoom-slider-container, #extra-controls-container {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 2rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    padding: 0.6rem 1.5rem;
    touch-action: none;
}

.portal-link-btn-mini {
    display: flex;
    align-items: center;
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.portal-link-btn-mini:hover {
    color: var(--primary-color);
}

#zoom-slider-container {
    flex-direction: row;
    gap: 1rem;
}

#top-nav-mini {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2100;
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    padding: 0.8rem;
    touch-action: none;
    pointer-events: auto;
}

#extra-controls-container {
    flex-direction: row;
    gap: 1.2rem;
    padding: 0.6rem 1.2rem;
}

.control-row {
    display: flex;
    align-items: center;
    width: auto;
    gap: 0.5rem;
}

.control-mini-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.7);
    white-space: nowrap;
}

#division-val {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-color);
    min-width: 15px;
}

#division-slider {
    flex-grow: 1;
    height: 4px;
    background: rgba(255,255,255,0.15);
    border-radius: 2px;
    cursor: pointer;
    touch-action: pan-y !important; /* Allow touch sliding (v2.8.1 fix) */
}

.snap-toggle {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-color);
    white-space: nowrap;
}

.snap-toggle input {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.zoom-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.7);
    margin-right: 0.5rem;
}

#zoom-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 180px;
    height: 4px;
    background: rgba(255,255,255,0.15);
    border-radius: 2px;
    cursor: pointer;
    margin: 0;
    touch-action: pan-y !important; /* Allow touch sliding (v2.8.1 fix) */
}

#zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 2px solid white;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.6);
}

@media (max-width: 768px) {
    #canvas-actions {
        left: 50% !important;
        bottom: 80px;
    }
    #floating-top-controls {
        top: 20px;
        left: 50% !important;
        width: 100%;
        padding: 0 10px;
    }
    .top-row {
        width: 100%;
        justify-content: center;
    }
    #extra-controls-container {
        padding: 0.5rem 0.8rem;
        width: auto;
        max-width: 95vw;
        flex-direction: row;
        gap: 0.8rem;
    }
    #zoom-slider-container {
        padding: 0.5rem 1rem;
        gap: 0.6rem;
        flex-grow: 0;
    }
    #zoom-slider {
        width: 120px;
    }
    #division-slider {
        width: 70px;
    }
    .snap-toggle {
        font-size: 0.75rem;
    }
}

.portal-link-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 10px 18px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    transition: all 0.2s ease;
    touch-action: none;
}

.portal-link-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}