/* simulator.css */
:root {
    --bg-main: #0f172a;
    --bg-panel: #1e293b;
    --accent-cyan: #06b6d4;
    --accent-purple: #a855f7;
    --accent-green: #22c55e;
    --accent-yellow: #eab308;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#sim-container {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
    padding: 20px;
    gap: 20px;
}

/* Left Panel: Code & Controls */
#control-panel {
    width: 300px;
    background: var(--bg-panel);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.panel-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 10px;
}

textarea#code-editor {
    flex-grow: 1;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    color: #a5b4fc;
    font-family: 'Fira Code', monospace;
    padding: 10px;
    resize: none;
    outline: none;
    font-size: 0.9rem;
    line-height: 1.5;
}

.btn-group {
    display: flex;
    gap: 10px;
}

button.sim-btn {
    flex: 1;
    padding: 10px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: white;
}

button.btn-run {
    background: var(--accent-green);
}

button.btn-run:hover {
    background: #16a34a;
}

button.btn-step {
    background: var(--accent-cyan);
}

button.btn-step:hover {
    background: #0891b2;
}

button.btn-reset {
    background: #ef4444;
}

button.btn-reset:hover {
    background: #dc2626;
}

/* Center: CPU Internals */
#cpu-view {
    flex-grow: 1;
    background: rgba(30, 41, 59, 0.5);
    border-radius: 12px;
    border: 2px solid #334155;
    position: relative;
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto 1fr;
    /* Header, Control/ALU, Registers */
    gap: 20px;
}

.cpu-label {
    position: absolute;
    top: 10px;
    left: 20px;
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.05);
    /* Watermark style */
    pointer-events: none;
}

/* Registers */
.register-box {
    background: var(--bg-panel);
    border: 1px solid var(--accent-cyan);
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.register-box.active {
    box-shadow: 0 0 15px var(--accent-cyan);
    border-color: #fff;
    transform: scale(1.02);
    z-index: 10;
}

.reg-name {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 5px;
}

.reg-value {
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    color: var(--accent-cyan);
    font-weight: 700;
}

/* Specific Positions (Grid layout helper) */
#reg-pc {
    grid-column: 1;
    grid-row: 2;
    border-color: var(--accent-purple);
}

#reg-pc .reg-value {
    color: var(--accent-purple);
}

#reg-mar {
    grid-column: 1;
    grid-row: 3;
    align-self: start;
}

#reg-mdr {
    grid-column: 2;
    grid-row: 3;
    align-self: start;
}

#reg-acc {
    grid-column: 2;
    grid-row: 2;
    border-color: var(--accent-green);
}

#reg-acc .reg-value {
    color: var(--accent-green);
}

#alu-unit {
    grid-column: 2;
    grid-row: 2;
    /* ALU visually sits near ACC, maybe use absolute or nested grid if needed */
    /* For simplicity, let's just make ACC prominent as the result holder */
}

/* Right: RAM */
#memory-view {
    width: 250px;
    background: var(--bg-panel);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow-y: auto;
}

.mem-cell {
    display: flex;
    justify-content: space-between;
    padding: 8px;
    border-bottom: 1px solid #334155;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    cursor: pointer;
}

.mem-cell:hover {
    background: rgba(255, 255, 255, 0.05);
}

.mem-cell.active {
    background: rgba(6, 182, 212, 0.2);
    border-left: 3px solid var(--accent-cyan);
}

.mem-addr {
    color: var(--text-muted);
}

.mem-val {
    color: var(--text-main);
    font-weight: 600;
}

/* Logs / Status */
#status-bar {
    margin-top: auto;
    /* Push to bottom of control panel? */
    padding: 10px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 6px;
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--accent-yellow);
    min-height: 40px;
}