:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-panel: #0d0d0d;
    --border: #2a2a2a;
    --border-glow: #00ff4120;
    --text-primary: #00ff41;
    --text-secondary: #00cc33;
    --text-dim: #006622;
    --text-muted: #444;
    --accent: #00ff41;
    --accent-dim: #00aa2a;
    --highlight: #ffff00;
    --error: #ff4444;
    --warning: #ffaa00;
    --read-color: #4488ff;
    --write-color: #ff4444;
    --breakpoint: #ff0044;
    --font-mono: 'Fira Code', 'IBM Plex Mono', 'Courier New', monospace;
    --scanline-opacity: 0.03;
    --editor-line-height: 1.5;
    --editor-font-size: 11px;
}

[data-theme="amber"] {
    --text-primary: #ffb000;
    --text-secondary: #cc8800;
    --text-dim: #664400;
    --accent: #ffb000;
    --accent-dim: #aa7700;
    --border-glow: #ffb00020;
}

[data-theme="blue"] {
    --text-primary: #00aaff;
    --text-secondary: #0088cc;
    --text-dim: #004466;
    --accent: #00aaff;
    --accent-dim: #0077aa;
    --border-glow: #00aaff20;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
}

#app {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.scanlines::after {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    background: repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,0,0,var(--scanline-opacity)) 2px,rgba(0,0,0,var(--scanline-opacity)) 4px);
    z-index: 10000;
}

.header {
    display: flex;
    align-items: center;
    padding: 4px 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    gap: 6px;
    flex-shrink: 0;
    min-height: 36px;
    flex-wrap: wrap;
}

.header-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent);
    white-space: nowrap;
    margin-right: 8px;
}

.toolbar-btn {
    padding: 3px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.15s;
    white-space: nowrap;
}

.toolbar-btn:hover {
    background: var(--accent-dim);
    color: var(--bg-primary);
    border-color: var(--accent);
    box-shadow: 0 0 6px var(--accent);
}

.toolbar-btn:active { transform: scale(0.97); }

.toolbar-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
}

.toolbar-btn.danger {
    border-color: var(--error);
    color: var(--error);
}

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

.header-info {
    font-size: 10px;
    color: var(--text-dim);
    white-space: nowrap;
}

.header-info span { color: var(--text-secondary); }

.speed-control {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 10px;
    color: var(--text-dim);
}

.speed-control input[type="range"] {
    width: 60px;
    accent-color: var(--accent);
    height: 12px;
}

.theme-select, .example-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 10px;
    padding: 2px 4px;
    cursor: pointer;
}

.example-select { max-width: 160px; }

.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.panel {
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
    overflow: hidden;
    min-width: 0;
}

.panel:last-child { border-right: none; }

.panel-header {
    padding: 3px 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-body {
    flex: 1;
    overflow: auto;
    background: var(--bg-panel);
}

/* CODE EDITOR */
.code-editor-wrap {
    position: relative;
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: row;
}

.line-numbers {
    width: 44px;
    min-width: 44px;
    padding: 4px 6px 4px 2px;
    text-align: right;
    color: #555;
    font-size: var(--editor-font-size);
    font-family: var(--font-mono);
    line-height: var(--editor-line-height);
    user-select: none;
    border-right: 1px solid #222;
    overflow: hidden;
    background: #0d0d0d;
    flex-shrink: 0;
}

.line-numbers .line-number {
    display: block;
    text-align: right;
    white-space: nowrap;
    color: #555;
    font-size: var(--editor-font-size);
    font-family: var(--font-mono);
    line-height: var(--editor-line-height);
    height: calc(var(--editor-font-size) * var(--editor-line-height));
}

.editor-container {
    position: relative;
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

.code-highlight {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: 0;
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: var(--editor-font-size);
    line-height: var(--editor-line-height);
    white-space: pre;
    overflow: auto;
    color: var(--text-dim);
    background: transparent;
    pointer-events: none;
    border: none;
    tab-size: 8;
    word-wrap: normal;
    -moz-tab-size: 8;
}

.hl-mnemonic { color: #00ff41; font-weight: 600; }
[data-theme="amber"] .hl-mnemonic { color: #ffb000; font-weight: 600; }
[data-theme="blue"] .hl-mnemonic { color: #00aaff; font-weight: 600; }

.hl-directive { color: #ff79c6; font-weight: 600; }
.hl-register { color: #8be9fd; }
[data-theme="amber"] .hl-register { color: #ffd866; }
[data-theme="blue"] .hl-register { color: #a0d8ef; }

.hl-number { color: #bd93f9; }
[data-theme="amber"] .hl-number { color: #e0a0ff; }
[data-theme="blue"] .hl-number { color: #caa0ff; }

.hl-string { color: #f1fa8c; }
.hl-comment { color: #6272a4; font-style: italic; }
.hl-label { color: #ffb86c; font-weight: 600; }
.hl-ident { color: #ffb86c; }
.hl-bracket { color: #ff79c6; }

.code-textarea {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: transparent;
    color: transparent;
    caret-color: var(--text-primary);
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-mono);
    font-size: var(--editor-font-size);
    line-height: var(--editor-line-height);
    padding: 4px 8px;
    tab-size: 8;
    white-space: pre;
    overflow: auto;
    z-index: 1;
    -moz-tab-size: 8;
}

.code-textarea::selection {
    background: rgba(0, 255, 65, 0.2);
    color: transparent;
}
[data-theme="amber"] .code-textarea::selection { background: rgba(255, 176, 0, 0.2); }
[data-theme="blue"] .code-textarea::selection { background: rgba(0, 170, 255, 0.2); }

.code-textarea::placeholder { color: var(--text-dim); }

.error-bar {
    padding: 4px 8px;
    background: #1a0000;
    border-top: 1px solid var(--error);
    color: var(--error);
    font-size: 10px;
    flex-shrink: 0;
    max-height: 60px;
    overflow-y: auto;
}

/* Disassembly */
.disasm-line {
    display: flex;
    padding: 1px 8px;
    font-size: 11px;
    line-height: 1.5;
    cursor: pointer;
    border-left: 3px solid transparent;
}

.disasm-line:hover { background: var(--bg-tertiary); }

.disasm-line.current {
    background: #002200;
    border-left-color: var(--accent);
}

[data-theme="amber"] .disasm-line.current { background: #1a1100; }
[data-theme="blue"] .disasm-line.current { background: #001122; }

.disasm-line.breakpoint { border-left-color: var(--breakpoint); }

.disasm-line.breakpoint .disasm-addr::before {
    content: '●';
    color: var(--breakpoint);
    margin-right: 4px;
}

.disasm-addr { color: var(--text-dim); min-width: 70px; flex-shrink: 0; }
.disasm-bytes { color: var(--text-muted); min-width: 80px; flex-shrink: 0; }
.disasm-mnemonic { color: var(--accent); font-weight: 500; }

/* Registers */
.reg-section {
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
}

.reg-section-title {
    font-size: 9px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 3px;
}

.reg-row {
    display: flex;
    align-items: center;
    padding: 1px 0;
    font-size: 11px;
    gap: 4px;
}

.reg-name {
    color: var(--text-secondary);
    min-width: 24px;
    font-weight: 600;
}

.reg-value {
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s, text-shadow 0.3s;
    min-width: 40px;
}

.reg-value.changed {
    color: var(--highlight);
    text-shadow: 0 0 8px var(--highlight);
}

.reg-sub { color: var(--text-dim); font-size: 10px; }

.flags-row {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
    padding: 4px 0;
}

.flag-indicator {
    width: 22px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    font-weight: 700;
    border: 1px solid var(--border);
    border-radius: 2px;
    transition: all 0.3s;
}

.flag-indicator.active {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
    box-shadow: 0 0 6px var(--accent);
}

.flag-indicator.inactive {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.flag-indicator.changed {
    animation: flagFlash 0.5s ease;
}

@keyframes flagFlash {
    0%, 100% { }
    50% { box-shadow: 0 0 12px var(--highlight); border-color: var(--highlight); }
}

.stack-entry {
    display: flex;
    padding: 1px 8px;
    font-size: 11px;
    gap: 8px;
}

.stack-entry.top {
    background: #001a00;
    font-weight: 600;
}

[data-theme="amber"] .stack-entry.top { background: #1a1100; }
[data-theme="blue"] .stack-entry.top { background: #001122; }

.stack-addr { color: var(--text-dim); min-width: 50px; }
.stack-val { color: var(--text-primary); }

/* Bottom */
.bottom-container {
    display: flex;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    height: 180px;
    min-height: 100px;
    min-width: 0;
    overflow: hidden;
}

.bottom-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.mem-controls {
    display: flex;
    gap: 4px;
    padding: 3px 8px;
    align-items: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.mem-addr-input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 2px 6px;
    width: 80px;
    outline: none;
}

.mem-addr-input:focus { border-color: var(--accent); }

.mem-jump-btn { font-size: 9px; padding: 2px 5px; }

.hex-view {
    flex: 1;
    overflow: auto;
    padding: 2px 8px;
    font-size: 11px;
    line-height: 1.4;
}

.hex-line {
    display: flex;
    white-space: nowrap;
    overflow: hidden;
}

.hex-addr { color: var(--text-dim); min-width: 55px; margin-right: 8px; }

.hex-bytes { margin-right: 8px; flex-shrink: 0; }

.hex-byte {
    display: inline-block;
    width: 22px;
    text-align: center;
    color: var(--text-primary);
}

.hex-byte.read { color: var(--read-color); text-shadow: 0 0 4px var(--read-color); }
.hex-byte.written { color: var(--write-color); text-shadow: 0 0 4px var(--write-color); }

.hex-ascii { color: var(--text-dim); }
.hex-ascii .printable { color: var(--text-secondary); }

.console-output {
    flex: 1;
    overflow: auto;
    padding: 4px 8px;
    font-size: 12px;
    line-height: 1.4;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-primary);
    background: var(--bg-primary);
    text-shadow: 0 0 4px var(--accent);
}

.console-cursor {
    display: inline-block;
    width: 7px;
    height: 14px;
    background: var(--accent);
    animation: blink 1s step-end infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.exec-log {
    flex: 1;
    overflow: auto;
    padding: 2px 8px;
    font-size: 10px;
}

.exec-log-entry {
    color: var(--text-dim);
    border-bottom: 1px solid #111;
    padding: 1px 0;
}

.exec-log-entry .log-addr { color: var(--text-secondary); }

.footer {
    padding: 2px 8px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    font-size: 9px;
    color: var(--text-dim);
    display: flex;
    justify-content: space-between;
    flex-shrink: 0;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer a:hover {
    color: var(--accent);
    text-decoration: underline;
}

.tab-bar {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.tab-btn {
    padding: 2px 10px;
    font-size: 10px;
    font-family: var(--font-mono);
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

.tab-btn:hover { color: var(--text-secondary); }

/* Opcode Reference Modal */
.opcode-modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.opcode-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 95vw;
    max-width: 1100px;
    height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(0,255,65,0.1);
}

.opcode-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-tertiary);
}

.opcode-modal-header h2 {
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
}

.opcode-modal-close {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 2px;
    font-family: var(--font-mono);
}

.opcode-modal-close:hover {
    background: var(--error);
    color: white;
    border-color: var(--error);
}

.opcode-search {
    padding: 6px 12px;
    border-bottom: 1px solid var(--border);
}

.opcode-search input {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 4px 8px;
    outline: none;
}

.opcode-search input:focus { border-color: var(--accent); }

.opcode-grid-wrap {
    flex: 1;
    overflow: auto;
    padding: 8px;
}

.opcode-grid {
    display: grid;
    grid-template-columns: 28px repeat(16, 1fr);
    grid-template-rows: auto repeat(16, 1fr);
    gap: 1px;
    font-size: 8px;
    width: 100%;
    min-width: 700px;
}

.opcode-grid-header {
    background: var(--bg-tertiary);
    color: var(--text-dim);
    text-align: center;
    padding: 2px;
    font-weight: 600;
    font-size: 9px;
}

.opcode-cell {
    padding: 2px 1px;
    text-align: center;
    border: 1px solid #1a1a1a;
    cursor: pointer;
    font-size: 7.5px;
    line-height: 1.2;
    min-height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.1s;
    word-break: break-all;
}

.opcode-cell:hover {
    border-color: var(--accent);
    z-index: 1;
    transform: scale(1.1);
    box-shadow: 0 0 8px var(--accent);
}

.opcode-cell.cat-arith { background: #1a0000; color: #ff6666; }
.opcode-cell.cat-logic { background: #1a0000; color: #ff8888; }
.opcode-cell.cat-data { background: #0d001a; color: #cc88ff; }
.opcode-cell.cat-control { background: #001a00; color: #66ff66; }
.opcode-cell.cat-string { background: #1a0d00; color: #ffaa44; }
.opcode-cell.cat-prefix { background: #001a1a; color: #44ffff; }
.opcode-cell.cat-group { background: #1a1a00; color: #ffff66; }
.opcode-cell.cat-misc { background: #000d1a; color: #6688ff; }
.opcode-cell.cat-io { background: #001a0d; color: #44ffaa; }
.opcode-cell.cat-flag { background: #0d0d1a; color: #8888ff; }
.opcode-cell.highlighted { box-shadow: 0 0 6px var(--accent); border-color: var(--accent); }
.opcode-cell.dimmed { opacity: 0.25; }

.opcode-detail {
    padding: 8px 12px;
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
    min-height: 60px;
    font-size: 11px;
    line-height: 1.5;
}

.opcode-detail-title {
    color: var(--accent);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 2px;
}

.opcode-detail-info { color: var(--text-secondary); }
.opcode-detail-info span { color: var(--text-dim); margin-right: 12px; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* HLT indicator */
.hlt-indicator {
    color: var(--warning);
    font-size: 10px;
    font-weight: 700;
    margin-left: 8px;
    animation: hltBlink 1s step-end infinite;
}

@keyframes hltBlink { 50% { opacity: 0.3; } }

/* Responsive */
@media (max-width: 1200px) {
    .hex-byte { width: 18px; font-size: 10px; }
    .hex-addr { min-width: 45px; font-size: 10px; }
    .disasm-addr { min-width: 60px; font-size: 10px; }
    .disasm-bytes { min-width: 60px; font-size: 10px; }
}

@media (max-width: 900px) {
    .main-container { flex-direction: column; }
    .panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
        min-height: 150px;
        max-height: 300px;
        min-width: 0;
        width: 100% !important;
    }
    .bottom-container { flex-direction: column; height: auto; }
    .bottom-panel { min-height: 120px; }
}