:root {
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-secondary: #475569;
    --accent-secondary-hover: #334155;
    --accent-danger: #ef4444;
    --accent-danger-hover: #dc2626;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --item-bg: rgba(255, 255, 255, 0.02);
    --search-bg: rgba(59, 130, 246, 0.15);
    --search-border: #3b82f6;
    --lookahead-bg: rgba(34, 197, 94, 0.15);
    --lookahead-border: #22c55e;
    --match-highlight: #fbbf24;
    --match-border: #f59e0b;
    --buffer-color: #a855f7;
    --check-color: #3b82f6;
    --processed-color: #64748b;
    --copy-source: #fbbf24;
    --copy-dest: #4ade80;
    --inspector-bg: rgba(251, 146, 60, 0.1);
    --inspector-border: rgba(251, 146, 60, 0.3);
    --inspector-text: #fb923c;
}

[data-theme="light"] {
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-secondary: #e2e8f0;
    --accent-secondary-hover: #cbd5e1;
    --accent-danger: #ef4444;
    --accent-danger-hover: #dc2626;
    --border-color: rgba(0, 0, 0, 0.1);
    --item-bg: rgba(0, 0, 0, 0.02);
    --search-bg: #dbeafe;
    --search-border: #3b82f6;
    --lookahead-bg: #dcfce7;
    --lookahead-border: #22c55e;
    --match-highlight: #fcd34d;
    --match-border: #f59e0b;
    --buffer-color: #a855f7;
    --check-color: #3b82f6;
    --processed-color: #94a3af;
    --copy-source: #fcd34d;
    --copy-dest: #86efac;
    --inspector-bg: #fff7ed;
    --inspector-border: #fed7aa;
    --inspector-text: #9a3412;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    position: relative;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease;
}

/* Top controls bar */
.top-controls {
    width: 100%;
    max-width: 1000px;
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 20px;
}

/* Language selector */
.language-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--panel-bg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
    outline: none;
}

.language-selector select:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.language-selector select:focus {
    border-color: var(--accent-primary);
}

/* Theme toggle button */
.theme-toggle {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--panel-bg);
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

h1 { 
    color: var(--text-primary);
    font-weight: 700;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    margin-top: 30px;
    letter-spacing: -0.025em;
    width: 100%;
    max-width: 1000px;
    text-align: center;
}

h1:first-child { margin-top: 0; }

.section-divider {
    width: 100%;
    max-width: 1000px;
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 40px 0;
}

.container {
    width: 100%;
    max-width: 1000px;
    background: var(--panel-bg);
    padding: 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    margin-bottom: 24px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Controles */
.controls {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

input[type="text"] {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Fira Code', monospace;
    background: var(--bg-color);
    color: var(--text-primary);
    flex-grow: 1;
    font-size: 1rem;
    letter-spacing: 0.5px;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    border-color: var(--accent-primary);
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--accent-secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover {
    background-color: var(--accent-danger-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: translateY(0);
}

button:disabled { 
    opacity: 0.5; 
    cursor: not-allowed; 
    pointer-events: none;
}

/* Inspector Panel */
.inspector-container {
    background: var(--inspector-bg);
    border: 1px solid var(--inspector-border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
    font-family: 'Fira Code', monospace;
    color: var(--inspector-text);
    font-size: 0.95em;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.inspector-line { 
    margin: 0;
    line-height: 1.6;
}

.buffer-display {
    font-weight: 600;
    color: var(--buffer-color);
    background: rgba(168, 85, 247, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Visualización de la Cinta */
.tape-container {
    overflow-x: auto;
    padding: 20px 0;
    margin-bottom: 20px;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.tape {
    display: flex;
    align-items: center;
    min-width: max-content;
    padding: 0 20px;
}

.cell {
    width: 40px;
    height: 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    margin-right: 2px;
    border-radius: 4px;
    position: relative;
    font-family: 'Fira Code', monospace;
    font-size: 1.2em;
    font-weight: 600;
    transition: all 0.2s;
    color: var(--text-primary);
}

.cell .index {
    font-size: 0.6em;
    color: var(--text-secondary);
    position: absolute;
    top: -18px;
    font-weight: normal;
}

/* Estados ENCODER */
.cell.search-buffer { 
    background-color: var(--search-bg);
    border-color: var(--search-border);
}

.cell.look-ahead {
    background-color: var(--lookahead-bg);
    border-color: var(--lookahead-border);
    border-top-width: 3px;
}

.cell.processed {
    opacity: 0.5;
    background-color: var(--item-bg);
    color: var(--processed-color);
}

.cell.highlight-checking { 
    background-color: var(--search-bg);
    border-color: var(--check-color);
    color: var(--check-color);
    border-width: 2px;
    transform: scale(1.05);
    z-index: 20;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.5);
}

.cell.highlight-match { 
    background-color: var(--match-highlight);
    border-color: var(--match-border);
    transform: scale(1.1);
    z-index: 10;
    color: #78350f;
}

.cell.highlight-buffer {
    background-color: var(--buffer-color);
    color: white;
    border-color: #7e22ce;
}

.cell.highlight-fail {
    background-color: rgba(239, 68, 68, 0.2);
    border-color: var(--accent-danger);
    color: var(--accent-danger);
}

/* Estados DECODER */
.cell.decoded {
    background-color: var(--item-bg);
    color: var(--text-primary);
}

.cell.copy-source { 
    background-color: var(--copy-source);
    border-color: var(--match-border);
    transform: scale(1.05);
    z-index: 5;
    color: #78350f;
}

.cell.copy-dest { 
    background-color: var(--copy-dest);
    border-color: #16a34a;
    animation: pulse 0.5s ease-in-out;
    color: #14532d;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* Leyenda */
.legend {
    display: flex;
    gap: 16px;
    font-size: 0.85em;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    border: 1px solid var(--border-color);
}

/* Paneles */
.output-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .output-panel { grid-template-columns: 1fr; }
}

.panel-box {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    background: var(--bg-color);
    height: 300px;
    overflow-y: auto;
}

.panel-title {
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    font-size: 0.95rem;
}

.log-entry {
    font-family: 'Fira Code', monospace;
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85em;
    color: var(--text-secondary);
}

.log-entry:last-child {
    border-bottom: none;
}

.token {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    margin: 4px;
    font-size: 0.85em;
    font-family: 'Fira Code', monospace;
    transition: all 0.2s;
}

.token.literal {
    background-color: var(--item-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.token.reference {
    background-color: rgba(251, 191, 36, 0.15);
    color: var(--match-border);
    border: 1px solid var(--match-border);
    font-weight: 600;
}

.token.active {
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 8px rgba(37, 99, 235, 0.4);
    transform: scale(1.05);
}

.status-bar {
    margin-top: 16px;
    padding: 12px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
    border-radius: var(--radius-md);
    font-size: 0.9em;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--accent-secondary);
    border-radius: 5px;
    border: 2px solid var(--bg-color);
}

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

/* Copyright Footer */
.copyright-footer {
    width: 100%;
    max-width: 1000px;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.copyright-footer p {
    margin: 0;
}

.copyright-footer a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Responsive */
@media (max-width: 640px) {
    body {
        padding: 20px 10px;
    }
    
    .container {
        padding: 16px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .top-controls {
        gap: 8px;
        justify-content: center;
    }
    
    .copyright-footer {
        font-size: 0.8rem;
        padding: 16px 0;
    }
}