:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #151922;
    --bg-tertiary: #1a1f2b;
    --accent-cyan: #00d9ff;
    --accent-magenta: #ff00ff;
    --accent-yellow: #ffed00;
    --text-primary: #e6e6e6;
    --text-secondary: #8a8a8a;
    --border: #2a3040;
    --glow-cyan: rgba(0, 217, 255, 0.3);
    --glow-magenta: rgba(255, 0, 255, 0.3);
}

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

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0, 217, 255, 0.03) 2px, rgba(0, 217, 255, 0.03) 4px),
        radial-gradient(circle at 20% 50%, rgba(255, 0, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 217, 255, 0.05) 0%, transparent 50%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    margin-bottom: 3rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 1.5rem;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 200px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    animation: scanline 3s linear infinite;
}

@keyframes scanline {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(100vw - 200px)); }
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-magenta) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 30px var(--glow-cyan);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.controls {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.iv-display {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.iv-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.iv-bytes {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.iv-byte {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-cyan);
    padding: 0.35rem 0.65rem;
    border-radius: 3px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent-cyan);
    font-weight: 700;
}

.btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--accent-cyan);
    padding: 0.75rem 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--glow-cyan);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    border-color: var(--accent-magenta);
    box-shadow: 0 0 20px var(--glow-cyan);
    transform: translateY(-2px);
}

.btn span {
    position: relative;
    z-index: 1;
}

.editor-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    position: relative;
}

.editor-container::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
    border-radius: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.editor-container:hover::before {
    opacity: 0.1;
}

.bytes {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    justify-content: center;
}

.byte {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 0.5rem;
    width: 40px;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 4px;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

.byte:hover {
    background: var(--bg-primary);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px var(--glow-cyan);
    transform: scale(1.1);
    z-index: 10;
}

.byte:focus {
    outline: none;
    border-color: var(--accent-magenta);
    box-shadow: 0 0 20px var(--glow-magenta);
}

.byte.modified {
    border-color: var(--accent-yellow);
    color: var(--accent-yellow);
}

.byte.locked {
    background: var(--bg-tertiary);
    opacity: 0.6;
    cursor: not-allowed;
    border-color: var(--border);
    color: var(--text-secondary);
}

.byte.locked:hover {
    background: var(--bg-tertiary);
    border-color: var(--border);
    box-shadow: none;
    transform: none;
}

.byte.locked:focus {
    outline: none;
    border-color: var(--border);
    box-shadow: none;
}

.byte.selected {
    border: 2px solid var(--accent-magenta);
    background: rgba(255, 0, 255, 0.15);
    box-shadow: 0 0 20px var(--glow-magenta);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px var(--glow-magenta);
    }
    50% {
        box-shadow: 0 0 30px var(--glow-magenta), 0 0 40px var(--glow-magenta);
    }
}

.byte.selected:hover {
    border: 2px solid var(--accent-magenta);
    transform: scale(1.1);
}

.ascii {
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border);
    min-width: 180px;
    letter-spacing: 0.15em;
}

.ascii span {
    display: inline-block;
    transition: color 0.2s ease;
}

.ascii span:hover {
    color: var(--accent-magenta);
}

.stats {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 2rem;
    font-size: 0.85rem;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-label {
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

.stat-value {
    color: var(--accent-cyan);
    font-weight: 700;
    font-size: 1.1rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .byte-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

.verification-result {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    min-height: 1.5rem;
}

.verify-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .verify-section {
        flex-direction: column;
    }
}