:root {
    --bg-color: #050505;
    --panel-bg: #111111;
    --panel-border: #333333;
    --text-main: #ffffff;
    --text-muted: #888888;
    --accent: #ff3366;
    --accent-hover: #ff0044;
}

* {
    box-sizing: border-box;
    user-select: none;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Space Grotesk', monospace; /* Sharp, technical font */
    overflow: hidden;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 20px 20px; /* Blueprint grid effect */
}

/* Base Canvas for solids and liquids */
#game-canvas {
    position: absolute;
    image-rendering: pixelated;
    background-color: #000;
    box-shadow: 0 0 50px rgba(0,0,0,0.9);
    cursor: none;
    border: 1px solid #222;
    z-index: 2;
}

/* Glow Canvas for fire and smoke */
#glow-canvas {
    position: absolute;
    image-rendering: pixelated;
    pointer-events: none;
    z-index: 3;
    mix-blend-mode: screen;
    filter: blur(2px) drop-shadow(0 0 5px rgba(239, 68, 68, 0.8));
}

#brush-cursor {
    position: absolute;
    border: 1px solid var(--text-main);
    border-radius: 0; /* Sharp square cursor */
    pointer-events: none;
    z-index: 10;
    display: none;
    mix-blend-mode: difference;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    padding: 2rem;
}

.panel {
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid var(--panel-border);
    border-top: 2px solid var(--accent); /* Sleek top accent line */
    border-radius: 0;
    padding: 1.5rem;
    pointer-events: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
}

.toolbar {
    width: 280px;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
}

.debug-panel {
    width: 250px;
    height: fit-content;
}

.debug-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.debug-row span:first-child {
    color: var(--text-muted);
}

.debug-row span:last-child {
    color: var(--accent);
    font-family: monospace;
}

.toolbar-header {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 2px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.5rem;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 4px;
}
.tool-grid::-webkit-scrollbar {
    width: 6px;
}
.tool-grid::-webkit-scrollbar-track {
    background: #111;
}
.tool-grid::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 4px;
}

.tool-btn {
    background: #000;
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    border-radius: 0;
    padding: 0.75rem;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.1s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: uppercase;
}

.tool-btn:hover {
    background: #222;
    border-color: #555;
}

.tool-btn.active {
    background: #222;
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: inset 2px 0 0 var(--accent);
}

.color-swatch {
    width: 10px;
    height: 10px;
    border-radius: 0; /* Sharp swatch */
    border: 1px solid rgba(255,255,255,0.2);
}

input[type=range] {
    width: 100%;
    margin-top: 0.5rem;
    cursor: pointer;
    accent-color: var(--accent);
}

.stats {
    margin-top: auto;
    font-family: monospace;
    color: var(--accent);
    font-size: 1rem;
    font-weight: bold;
    text-align: right;
    border-top: 1px solid var(--panel-border);
    padding-top: 1rem;
}

.ai-panel {
    width: 250px;
    height: fit-content;
}

.ai-input {
    width: 100%;
    background: #000;
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 0.5rem;
    font-family: inherit;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.ai-input:focus {
    outline: none;
    border-color: var(--accent);
}

.ai-btn {
    width: 100%;
    background: var(--accent);
    color: #000;
    border: none;
    padding: 0.75rem;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    transition: background 0.1s;
    margin-bottom: 0.5rem;
}

.ai-btn:hover {
    background: var(--accent-hover);
}

.ai-btn:disabled {
    background: #333;
    color: #666;
    cursor: not-allowed;
}

.ai-status {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: monospace;
    line-height: 1.4;
}

.right-panels {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-end;
}

.ai-chat-box {
    background: #000;
    border: 1px solid var(--panel-border);
    height: 180px;
    overflow-y: auto;
    overflow-x: hidden;
    word-break: break-word;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.8rem;
}
.ai-chat-box::-webkit-scrollbar {
    width: 4px;
}
.ai-chat-box::-webkit-scrollbar-track {
    background: #111;
}
.ai-chat-box::-webkit-scrollbar-thumb {
    background: #444;
}

.chat-msg {
    padding: 0.5rem;
    border-radius: 4px;
    line-height: 1.3;
}
.chat-msg.system {
    background: rgba(255, 51, 102, 0.1);
    color: var(--accent);
    border-left: 2px solid var(--accent);
}
.chat-msg.user {
    background: #222;
    color: var(--text-main);
    align-self: flex-end;
    border-right: 2px solid #555;
    text-align: right;
}