:root {
    --bg-main: #0B0E14;
    /* Very dark tech theme */
    --bg-panel: #151A23;
    --bg-hover: #1f2532;
    --border-color: #2a3140;

    --text-main: #E2E8F0;
    --text-muted: #94A3B8;

    --color-primary: #3B82F6;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;

    --font-ui: 'Inter', system-ui, sans-serif;
    --font-mono: 'Fira Code', monospace;
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.app-layout {
    display: flex;
    height: 100%;
}

.hidden {
    display: none !important;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    overflow-y: auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-primary);
    margin-bottom: 2rem;
}

.brand h1 {
    font-size: 1.25rem;
    color: var(--text-main);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.section h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.05em;
}

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

textarea {
    width: 100%;
    height: 140px;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.75rem;
    border-radius: 6px;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s;
}

textarea:focus {
    border-color: var(--color-primary);
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: #2563EB;
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background: var(--border-color);
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.actions>* {
    flex: 1;
}

.semver-calc {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

input[type="text"] {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    border-radius: 4px;
    outline: none;
}

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

.semver-calc input {
    width: 100%;
}

.semver-result {
    grid-column: 1 / -1;
    font-size: 0.8rem;
    padding: 0.5rem;
    border-radius: 4px;
    text-align: center;
    background: var(--bg-main);
}

.semver-result.match {
    color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
}

.semver-result.mismatch {
    color: var(--color-danger);
    background: rgba(239, 68, 68, 0.1);
}

/* Main Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
}

.tabs {
    display: flex;
}

.tab {
    background: none;
    border: none;
    padding: 1rem;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

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

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

.scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background: var(--bg-main);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.panel-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.badge {
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-danger);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
}


/* Tree View */
.empty-state {
    color: var(--text-muted);
    text-align: center;
    padding: 3rem;
    font-style: italic;
}

.tree-node {
    margin-left: 1.5rem;
    position: relative;
}

.tree-node::before {
    content: '';
    position: absolute;
    left: -14px;
    top: 12px;
    width: 10px;
    height: 1px;
    background: var(--border-color);
}

.tree-node::after {
    content: '';
    position: absolute;
    left: -14px;
    top: -10px;
    bottom: 0;
    width: 1px;
    background: var(--border-color);
}

.tree-node:last-child::after {
    height: 23px;
}

.node-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
}

.node-content:hover {
    background: var(--bg-hover);
    border-radius: 4px;
}

.node-toggle {
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.8rem;
}

.node-toggle:hover {
    background: var(--border-color);
}

.node-name {
    color: var(--text-main);
    font-weight: 500;
}

.node-version {
    color: var(--text-muted);
}

/* Conflicts View */
.conflict-card {
    background: var(--bg-panel);
    border: 1px solid var(--color-danger);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.conflict-card.warning {
    border-color: var(--color-warning);
}

.cc-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.cc-title {
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

.cc-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.cc-col {
    background: var(--bg-main);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.cc-col-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.cc-req {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 0.2rem 0;
}

.cc-req span {
    color: var(--text-muted);
}

.cc-resolution {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 1rem;
    border-radius: 6px;
}

.cc-resolution strong {
    color: var(--color-success);
}

.cc-vuln {
    color: var(--color-danger);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Dedup View */
.dedup-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: #fff;
    color: #000;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.8rem;
    pointer-events: none;
    z-index: 1000;
    font-family: var(--font-mono);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}