:root {
    --navy-900: #0a1628;
    --navy-800: #0f2744;
    --navy-700: #153660;
    --navy-600: #1a4480;
    --navy-500: #2563a8;
    --navy-400: #3b82c4;
    --navy-300: #60a5e8;
    --navy-200: #93c5fd;
    --navy-100: #dbeafe;
    --accent-cyan: #22d3ee;
    --accent-green: #4ade80;
    --accent-yellow: #fbbf24;
    --accent-red: #f87171;
    --accent-purple: #a78bfa;
    --bg-primary: #0a1628;
    --bg-secondary: #0f2744;
    --bg-tertiary: #153660;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #1e3a5f;
    --selection-bg: rgba(37, 99, 168, 0.5);
    --diff-add: rgba(74, 222, 128, 0.2);
    --diff-remove: rgba(248, 113, 113, 0.2);
    --diff-change: rgba(251, 191, 36, 0.2);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1rem;
}

.app-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, var(--navy-800) 0%, var(--navy-700) 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.app-header h1 svg {
    width: 32px;
    height: 32px;
    color: var(--accent-cyan);
}

.app-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 800px;
    margin: 0 auto;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: 0.25rem;
    padding-right: 0.75rem;
    border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: inherit;
}

.btn:hover {
    background: var(--navy-600);
    border-color: var(--navy-500);
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--navy-600);
    border-color: var(--navy-500);
}

.btn-primary:hover {
    background: var(--navy-500);
}

.btn svg {
    width: 16px;
    height: 16px;
}

.btn-icon {
    padding: 0.5rem;
}

.main-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 1rem;
}

.editor-container {
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.editor-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.editor-info {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.editor-options {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.option-group {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.option-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.option-group select {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    cursor: pointer;
}

.hex-view-wrapper {
    overflow: auto;
    max-height: 500px;
    position: relative;
}

.hex-view {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
    padding: 0.5rem;
    min-height: 300px;
}

.hex-row {
    display: flex;
    align-items: stretch;
}

.hex-row:hover {
    background: rgba(37, 99, 168, 0.1);
}

.hex-offset {
    color: var(--text-muted);
    padding: 0 0.75rem;
    min-width: 100px;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border-color);
}

.hex-bytes {
    padding: 0 0.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.125rem;
}

.hex-byte {
    padding: 0 0.25rem;
    border-radius: 2px;
    cursor: pointer;
    transition: background 0.1s;
}

.hex-byte:hover {
    background: var(--navy-600);
}

.hex-byte.selected {
    background: var(--selection-bg);
    outline: 1px solid var(--navy-400);
}

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

.hex-byte.diff-add {
    background: var(--diff-add);
}

.hex-byte.diff-change {
    background: var(--diff-change);
}

.hex-byte.diff-remove {
    background: var(--diff-remove);
}

.hex-byte.bookmark {
    border-bottom: 2px solid var(--accent-purple);
}

.hex-byte.search-match {
    background: rgba(34, 211, 238, 0.3);
}

.hex-byte-group {
    margin-right: 0.5rem;
    display: inline-flex;
    gap: 0.125rem;
}

.ascii-column {
    padding: 0 0.75rem;
    border-left: 1px solid var(--border-color);
    color: var(--text-secondary);
    white-space: pre;
}

.ascii-char {
    cursor: pointer;
    padding: 0 1px;
    border-radius: 1px;
}

.ascii-char:hover {
    background: var(--navy-600);
}

.ascii-char.selected {
    background: var(--selection-bg);
}

.ascii-char.non-printable {
    color: var(--text-muted);
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel {
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0.875rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
}

.panel-header:hover {
    background: var(--navy-600);
}

.panel-title {
    font-size: 0.8125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-title svg {
    width: 14px;
    height: 14px;
    color: var(--accent-cyan);
}

.panel-toggle {
    color: var(--text-muted);
    transition: transform 0.2s;
}

.panel-toggle.collapsed {
    transform: rotate(-90deg);
}

.panel-content {
    padding: 0.75rem;
}

.panel-content.collapsed {
    display: none;
}

.inspector-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.inspector-label {
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.inspector-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    text-align: right;
}

.inspector-section {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.inspector-section:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.inspector-section-title {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.bookmark-list {
    max-height: 150px;
    overflow-y: auto;
}

.bookmark-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.375rem 0.5rem;
    font-size: 0.8125rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s;
}

.bookmark-item:hover {
    background: var(--bg-tertiary);
}

.bookmark-offset {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-purple);
}

.bookmark-name {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.bookmark-delete {
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.125rem;
    border-radius: 2px;
}

.bookmark-delete:hover {
    color: var(--accent-red);
    background: rgba(248, 113, 113, 0.1);
}

.stats-chart {
    height: 100px;
    margin-bottom: 0.75rem;
    background: var(--bg-primary);
    border-radius: 6px;
    overflow: hidden;
}

.stats-chart canvas {
    width: 100%;
    height: 100%;
}

.stats-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    font-size: 0.75rem;
}

.stat-item {
    padding: 0.375rem 0.5rem;
    background: var(--bg-primary);
    border-radius: 4px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.6875rem;
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
}

.hash-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.hash-item {
    padding: 0.5rem;
    background: var(--bg-primary);
    border-radius: 4px;
}

.hash-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.hash-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-primary);
    word-break: break-all;
    cursor: pointer;
}

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

.selection-info {
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.selection-item {
    display: flex;
    gap: 0.375rem;
}

.selection-label {
    color: var(--text-muted);
}

.selection-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-cyan);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 22, 40, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    transform: translateY(-20px);
    transition: transform 0.2s;
}

.modal-sm {
    max-width: 400px;
}

.modal-lg {
    max-width: 1200px;
    width: 95%;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 1.25rem;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
    max-height: 60vh;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: 0.875rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

.form-input:focus {
    outline: none;
    border-color: var(--navy-500);
    box-shadow: 0 0 0 3px rgba(37, 99, 168, 0.2);
}

.form-input::placeholder {
    color: var(--text-muted);
}

textarea.form-input {
    resize: vertical;
    font-family: 'JetBrains Mono', monospace;
}

.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-row .form-group {
    flex: 1;
}

.form-radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.form-radio {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.form-radio input {
    accent-color: var(--navy-500);
}

.compare-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 1rem;
}

.compare-panel {
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.compare-header {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.compare-title {
    font-size: 0.875rem;
    font-weight: 600;
}

.compare-content {
    height: 350px;
    overflow: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 0.5rem;
    line-height: 1.5;
}

.diff-summary {
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    font-size: 0.8125rem;
}

.diff-stat {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    margin-right: 1.5rem;
}

.diff-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.diff-dot.added {
    background: var(--accent-green);
}

.diff-dot.changed {
    background: var(--accent-yellow);
}

.diff-dot.removed {
    background: var(--accent-red);
}

.footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem;
    margin-top: 1rem;
}

.footer img {
    width: 32px;
    height: 32px;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
}

.footer a:hover {
    color: var(--accent-cyan);
}

.keyboard-shortcuts {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1rem;
}

.shortcut-key {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-primary);
    border-radius: 4px;
    color: var(--accent-cyan);
}

.shortcut-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: 1rem;
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--accent-green);
}

.toast.error {
    border-color: var(--accent-red);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 0.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 180px;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.15s;
}

.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.1s;
}

.dropdown-item:first-child {
    border-radius: 8px 8px 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 8px 8px;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
}

.tabs {
    display: flex;
    gap: 0.25rem;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    background: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
}

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

.tab.active {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

input[type="file"] {
    display: none;
}

@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-group {
        flex-wrap: wrap;
        border-right: none;
        padding-right: 0;
        padding-bottom: 0.5rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .toolbar-group:last-child {
        padding-bottom: 0;
        border-bottom: none;
    }
    
    .hex-offset {
        min-width: 70px;
        font-size: 11px;
    }
    
    .hex-view {
        font-size: 11px;
    }
    
    .compare-view {
        grid-template-columns: 1fr;
    }
    
    .editor-options {
        flex-wrap: wrap;
    }
    
    .sidebar {
        grid-template-columns: 1fr;
    }
}