:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #252525;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-highlight: #4CAF50;
    --border-color: #404040;
    --accent-color: #4CAF50;
    --accent-hover: #45a049;
    --danger-color: #f44336;
    --danger-hover: #da190b;
    --warning-color: #ff9800;
    --highlight-bg: #3a3a3a;
    --animation-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Courier New', 'Courier', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 30px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 10px;
    color: var(--accent-color);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1em;
    margin-bottom: 15px;
}

.learn-link {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 24px;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 1.1em;
    font-weight: 600;
    transition: all var(--animation-speed) ease;
    letter-spacing: 1px;
}

.learn-link:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}

/* Tablet Responsive Styles */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header {
        padding: 20px 0;
    }

    header h1 {
        font-size: 2em;
        letter-spacing: 1px;
    }

    .subtitle {
        font-size: 1em;
    }

    .learn-link {
        font-size: 1em;
        padding: 10px 20px;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }

    .section-header h2 {
        font-size: 1.3em;
        text-align: center;
    }

    .controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .btn {
        padding: 8px 16px;
        font-size: 0.9em;
    }

    .editor-container {
        min-height: 400px;
    }

    .code-editor {
        font-size: 0.9em;
    }

    .registers-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .flags-grid {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }

    .panel h3 {
        font-size: 1.1em;
    }

    .memory-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .memory-controls label {
        flex-direction: column;
        align-items: flex-start;
    }

    .memory-controls input[type="number"] {
        width: 100%;
        margin-top: 5px;
    }
}

/* Mobile Responsive Styles */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    header {
        padding: 15px 0;
    }

    header h1 {
        font-size: 1.6em;
        letter-spacing: 0.5px;
    }

    .subtitle {
        font-size: 0.9em;
    }

    .learn-link {
        font-size: 0.95em;
        padding: 10px 18px;
        margin-top: 12px;
    }

    .main-layout {
        gap: 20px;
    }

    .section-header {
        padding: 12px 15px;
    }

    .section-header h2 {
        font-size: 1.2em;
    }

    .controls {
        gap: 8px;
    }

    .btn {
        padding: 8px 12px;
        font-size: 0.85em;
        letter-spacing: 0.5px;
    }

    .editor-container {
        min-height: 350px;
    }

    .code-editor {
        font-size: 0.85em;
        padding: 12px;
    }

    .line-numbers {
        padding: 12px 8px;
        font-size: 0.85em;
    }

    .status-bar {
        flex-direction: column;
        gap: 8px;
        font-size: 0.85em;
    }

    .panel {
        padding: 15px;
    }

    .panel h3 {
        font-size: 1em;
        margin-bottom: 12px;
    }

    .registers-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 8px;
    }

    .register {
        padding: 8px;
    }

    .register-label {
        font-size: 0.8em;
    }

    .register-value {
        font-size: 1em;
    }

    .flags-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        gap: 8px;
    }

    .flag {
        padding: 8px;
    }

    .flag-label {
        font-size: 0.8em;
    }

    .flag-value {
        font-size: 1.1em;
    }

    .memory-controls input[type="number"] {
        padding: 8px;
    }

    .memory-grid {
        max-height: 250px;
        font-size: 0.9em;
    }

    .memory-address,
    .memory-value {
        padding: 5px 8px;
        font-size: 0.85em;
    }

    .pc-display {
        font-size: 1.3em;
    }

    footer {
        font-size: 0.85em;
        padding: 15px 0;
    }
}

/* Section Styling */
.editor-section,
.visualization-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.section-header h2 {
    font-size: 1.5em;
    color: var(--accent-color);
}

/* Controls */
.controls {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--animation-speed) ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--highlight-bg);
    transform: translateY(-2px);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
    transform: translateY(-2px);
}

.btn-small {
    padding: 5px 10px;
    font-size: 0.85em;
}

/* Editor Container */
.editor-container {
    display: flex;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    min-height: 500px;
}

.line-numbers {
    padding: 15px 10px;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border-color);
    font-size: 0.95em;
    line-height: 1.5;
}

.line-numbers div {
    transition: background-color var(--animation-speed) ease;
}

.line-numbers div.active {
    background-color: var(--accent-color);
    color: white;
    font-weight: bold;
}

.code-editor {
    flex: 1;
    padding: 15px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: none;
    outline: none;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 0.95em;
    line-height: 1.5;
    resize: none;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
}

/* Status Bar */
.status-bar {
    display: flex;
    justify-content: space-between;
    padding: 10px 15px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9em;
}

#statusText {
    font-weight: 600;
}

#statusText.success {
    color: var(--accent-color);
}

#statusText.error {
    color: var(--danger-color);
}

#statusText.running {
    color: var(--warning-color);
}

/* Panel Styling */
.panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 20px;
}

.panel h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-size: 1.2em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

/* Registers Grid */
.registers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
}

.register {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 10px;
    transition: all var(--animation-speed) ease;
}

.register.changed {
    border-color: var(--accent-color);
    background-color: var(--highlight-bg);
    animation: flash var(--animation-speed) ease;
}

@keyframes flash {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.register-label {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.register-value {
    font-size: 1.1em;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
}

.register-value:hover {
    color: var(--accent-color);
}

.register-value input {
    width: 100%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--accent-color);
    border-radius: 2px;
    padding: 2px 5px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1em;
}

/* Flags Grid */
.flags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
}

.flag {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 10px;
    text-align: center;
    transition: all var(--animation-speed) ease;
}

.flag.active {
    border-color: var(--accent-color);
    background-color: var(--highlight-bg);
}

.flag-label {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.flag-value {
    font-size: 1.2em;
    font-weight: 600;
    cursor: pointer;
}

.flag-value.true {
    color: var(--accent-color);
}

.flag-value.false {
    color: var(--text-secondary);
}

/* Memory Panel */
.memory-controls {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.memory-controls label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9em;
}

.memory-controls input[type="number"] {
    width: 100px;
    padding: 5px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    font-family: 'Courier New', 'Courier', monospace;
}

.memory-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 5px;
    max-height: 300px;
    overflow-y: auto;
}

.memory-address {
    font-size: 0.85em;
    color: var(--text-secondary);
    padding: 5px 10px;
    background-color: var(--bg-tertiary);
    border-radius: 2px;
}

.memory-value {
    padding: 5px 10px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    cursor: pointer;
    transition: all var(--animation-speed) ease;
}

.memory-value.changed {
    border-color: var(--accent-color);
    background-color: var(--highlight-bg);
    animation: flash var(--animation-speed) ease;
}

.memory-value:hover {
    background-color: var(--highlight-bg);
}

.memory-value input {
    width: 100%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--accent-color);
    border-radius: 2px;
    padding: 2px 5px;
    font-family: 'Courier New', 'Courier', monospace;
}

/* Program Counter */
.pc-display {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.5em;
}

.pc-label {
    color: var(--text-secondary);
    font-weight: 600;
}

#pcValue {
    flex: 1;
    padding: 10px;
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'Courier New', 'Courier', monospace;
    font-size: 1em;
    font-weight: 700;
    text-align: center;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    border-top: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9em;
}

footer .privacy-note {
    font-size: 0.8em;
    color: var(--text-secondary);
    margin-top: 5px;
    opacity: 0.8;
}

footer .footer-link {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.9em;
    transition: all var(--animation-speed) ease;
}

footer .footer-link:hover {
    text-decoration: underline;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: slideIn var(--animation-speed) ease;
}