/* ============================================
   PKA Activity Results Analyzer - Style v2.0
   Premium dark theme inspired by Cisco PT
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ─── CSS Variables ─── */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2233;
    --bg-card-hover: #1f2a3d;
    --bg-elevated: #243044;
    --bg-input: #0d1321;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-dim: #475569;
    
    --accent-blue: #3b82f6;
    --accent-blue-light: #60a5fa;
    --accent-cyan: #06b6d4;
    --accent-teal: #14b8a6;
    --accent-green: #22c55e;
    --accent-red: #ef4444;
    --accent-orange: #f97316;
    --accent-yellow: #eab308;
    --accent-purple: #a855f7;
    --accent-pink: #ec4899;
    
    --gradient-primary: linear-gradient(135deg, #3b82f6, #06b6d4);
    --gradient-success: linear-gradient(135deg, #22c55e, #14b8a6);
    --gradient-danger: linear-gradient(135deg, #ef4444, #f97316);
    --gradient-purple: linear-gradient(135deg, #a855f7, #ec4899);
    --gradient-card: linear-gradient(145deg, rgba(59,130,246,0.05), rgba(6,182,212,0.03));
    
    --border-color: rgba(148, 163, 184, 0.08);
    --border-accent: rgba(59, 130, 246, 0.3);
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(59,130,246,0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset ─── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ─── Background Pattern ─── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59,130,246,0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(6,182,212,0.05), transparent);
    pointer-events: none;
    z-index: 0;
}

/* ─── App Container ─── */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* ─── Header ─── */
.app-header {
    text-align: center;
    padding: 40px 20px 32px;
    margin-bottom: 32px;
}

.app-header .logo-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: 0 4px 20px rgba(59,130,246,0.3);
}

.app-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.app-header .subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
}

/* ─── Upload Area ─── */
.upload-section {
    margin-bottom: 32px;
}

.upload-zone {
    border: 2px dashed var(--border-accent);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--gradient-card);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(59,130,246,0.05), transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.upload-zone:hover {
    border-color: var(--accent-blue);
    background: linear-gradient(145deg, rgba(59,130,246,0.08), rgba(6,182,212,0.04));
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.upload-zone:hover::before {
    opacity: 1;
}

.upload-zone.dragging {
    border-color: var(--accent-cyan);
    background: linear-gradient(145deg, rgba(6,182,212,0.1), rgba(59,130,246,0.05));
    box-shadow: 0 0 30px rgba(6,182,212,0.2);
}

.upload-zone .icon {
    font-size: 48px;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.upload-zone .title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    position: relative;
    z-index: 1;
}

.upload-zone .desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
    z-index: 1;
}

.upload-zone input[type="file"] {
    display: none;
}

/* ─── Loading ─── */
.loading-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(10,14,23,0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(59,130,246,0.15);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

/* ─── Results Container ─── */
.results-container {
    display: none;
    animation: fadeIn 0.5s ease;
}

.results-container.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── File Info Bar ─── */
.file-info-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.file-info-bar .file-name {
    font-weight: 600;
    color: var(--accent-blue-light);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}

.file-info-bar .meta {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.file-info-bar .meta span {
    margin-right: 16px;
}

.file-info-bar .btn-new {
    margin-left: auto;
    padding: 6px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.file-info-bar .btn-new:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

/* ─── Tabs ─── */
.tabs-nav {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-secondary);
    background: rgba(255,255,255,0.03);
}

.tab-btn.active {
    background: var(--accent-blue);
    color: white;
    box-shadow: 0 2px 8px rgba(59,130,246,0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* ─── Score Summary Panel (Right Side in PT) ─── */
.results-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 900px) {
    .results-layout {
        grid-template-columns: 1fr;
    }
}

/* ─── Score Card ─── */
.score-panel {
    position: sticky;
    top: 20px;
}

.score-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
}

.score-card .score-header {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 4px;
}

.score-card .score-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.score-card .score-value {
    font-size: 2.2rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: -0.02em;
}

.score-card .score-value .earned {
    color: var(--accent-blue-light);
}

.score-card .score-value .divider {
    color: var(--text-dim);
}

.score-card .score-value .max {
    color: var(--text-muted);
}

.score-card .score-bar {
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.06);
    border-radius: 3px;
    margin-top: 12px;
    overflow: hidden;
}

.score-card .score-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--gradient-primary);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 8px rgba(59,130,246,0.4);
}

.item-count-section {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.item-count-section .label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.item-count-section .value {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-cyan);
}

/* ─── Component Table ─── */
.component-table-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.component-table-card .table-header {
    padding: 14px 20px;
    background: rgba(59,130,246,0.06);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.component-table {
    width: 100%;
    border-collapse: collapse;
}

.component-table th {
    text-align: left;
    padding: 10px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255,255,255,0.02);
}

.component-table th:last-child,
.component-table td:last-child {
    text-align: right;
    padding-right: 20px;
}

.component-table td {
    padding: 10px 16px;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.component-table tr:last-child td {
    border-bottom: none;
}

.component-table tr:hover td {
    background: rgba(59,130,246,0.04);
}

.component-table .comp-name {
    font-weight: 600;
    color: var(--text-primary);
}

.component-table .comp-items {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.component-table .comp-score {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent-blue-light);
}

/* Component color dots */
.comp-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

.comp-dot.ip { background: var(--accent-blue); }
.comp-dot.other { background: var(--accent-purple); }
.comp-dot.routing { background: var(--accent-orange); }
.comp-dot.switching { background: var(--accent-teal); }
.comp-dot.acl { background: var(--accent-red); }
.comp-dot.nat { background: var(--accent-yellow); }
.comp-dot.physical { background: var(--accent-green); }

/* ─── Assessment Tree ─── */
.assessment-tree {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.tree-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(59,130,246,0.04);
    border-bottom: 1px solid var(--border-color);
}

.tree-toolbar .btn-toggle {
    padding: 5px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tree-toolbar .btn-toggle:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.tree-toolbar .filter-group {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.tree-toolbar .filter-btn {
    padding: 4px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tree-toolbar .filter-btn:hover,
.tree-toolbar .filter-btn.active {
    background: rgba(59,130,246,0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
}

/* Tree Table Header */
.tree-table-header {
    display: grid;
    grid-template-columns: 1fr 100px 70px 100px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.tree-content {
    max-height: 700px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(59,130,246,0.2) transparent;
}

/* Group-level summary (X/Y text) */
.tree-node-status.group-summary {
    font-size: 0.72rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
}

.tree-content::-webkit-scrollbar {
    width: 6px;
}

.tree-content::-webkit-scrollbar-track {
    background: transparent;
}

.tree-content::-webkit-scrollbar-thumb {
    background: rgba(59,130,246,0.2);
    border-radius: 3px;
}

/* Tree Node */
.tree-node {
    border-bottom: 1px solid rgba(255,255,255,0.02);
}

.tree-node:last-child {
    border-bottom: none;
}

.tree-node-header {
    display: grid;
    grid-template-columns: 1fr 100px 70px 100px;
    align-items: center;
    padding: 6px 16px;
    cursor: pointer;
    transition: var(--transition);
    min-height: 34px;
}

.tree-node-header:hover {
    background: rgba(59,130,246,0.04);
}

.tree-node-name {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.84rem;
    color: var(--text-primary);
    overflow: hidden;
}

.tree-node-name .toggle-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--text-dim);
    transition: transform 0.2s ease;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tree-node-name .toggle-icon.expanded {
    transform: rotate(90deg);
}

.tree-node-name .node-icon {
    flex-shrink: 0;
    font-size: 0.8rem;
    margin-right: 4px;
}

.tree-node-name .name-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-node-name .indent {
    flex-shrink: 0;
}

/* Group nodes */
.tree-node.group > .tree-node-header .name-text {
    font-weight: 600;
}

.tree-node.device > .tree-node-header .name-text {
    font-weight: 600;
    color: var(--accent-cyan);
}

/* Item nodes (leaf) */
.tree-node.item > .tree-node-header {
    cursor: default;
}

.tree-node.item > .tree-node-header .name-text {
    font-weight: 400;
    font-size: 0.82rem;
}

.tree-node-status {
    font-size: 0.78rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.tree-node-status.correct {
    color: var(--accent-green);
}

.tree-node-status.incorrect {
    color: var(--accent-red);
}

.tree-node-status.not_checked {
    color: var(--text-dim);
}

.tree-node-points {
    font-size: 0.82rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
    text-align: center;
}

.tree-node-component {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: right;
}

.tree-node-children {
    display: none;
}

.tree-node-children.expanded {
    display: block;
}

/* Status icon */
.status-icon {
    width: 14px;
    height: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 8px;
    margin-right: 6px;
    flex-shrink: 0;
}

.status-icon.correct {
    background: rgba(34,197,94,0.15);
    color: var(--accent-green);
}

.status-icon.incorrect {
    background: rgba(239,68,68,0.15);
    color: var(--accent-red);
}

.status-icon.not_checked {
    background: rgba(100,116,139,0.15);
    color: var(--text-dim);
}

/* ─── Connectivity Tests Tab ─── */
.connectivity-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
}

/* ─── Instructions / Overall Feedback ─── */
.instructions-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    box-shadow: var(--shadow-md);
}

.instructions-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.instructions-card .content {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.instructions-card .content p {
    margin-bottom: 8px;
}

/* ─── Flat Items Table ─── */
.items-table-wrapper {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.items-table {
    width: 100%;
    border-collapse: collapse;
}

.items-table th {
    text-align: left;
    padding: 10px 14px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.items-table td {
    padding: 8px 14px;
    font-size: 0.82rem;
    border-bottom: 1px solid rgba(255,255,255,0.02);
    vertical-align: middle;
}

.items-table tr:hover td {
    background: rgba(59,130,246,0.03);
}

.items-table .device-col {
    font-weight: 600;
    color: var(--accent-cyan);
}

.items-table .name-col {
    color: var(--text-primary);
}

.items-table .expected-col {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--text-secondary);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* CLI Command Column */
.items-table .cli-col {
    min-width: 160px;
    max-width: 280px;
    vertical-align: top;
}

.cli-wrapper {
    position: relative;
    cursor: pointer;
}

.cli-code {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    line-height: 1.55;
    color: #4ade80;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(74, 222, 128, 0.1);
    border-radius: 6px;
    padding: 5px 8px;
    white-space: nowrap;
    overflow-x: auto;
    max-width: 260px;
    scrollbar-width: thin;
    scrollbar-color: rgba(74,222,128,0.2) transparent;
    transition: border-color 0.2s;
}

.cli-wrapper:hover .cli-code {
    border-color: rgba(74, 222, 128, 0.35);
}

.cli-code::-webkit-scrollbar {
    height: 3px;
}

.cli-code::-webkit-scrollbar-thumb {
    background: rgba(74,222,128,0.2);
    border-radius: 2px;
}

/* Hover tooltip: full command (显示在下方) */
.cli-tooltip {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 100;
    min-width: 220px;
    max-width: 400px;
}

.cli-wrapper:hover .cli-tooltip {
    display: block;
    animation: tooltipFadeIn 0.15s ease;
}

.cli-tooltip code {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    line-height: 1.6;
    color: #86efac;
    background: #0f1923;
    border: 1px solid rgba(74, 222, 128, 0.25);
    border-radius: 8px;
    padding: 10px 14px;
    white-space: pre;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5), 0 0 12px rgba(74,222,128,0.08);
}

.cli-tooltip::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 20px;
    border: 6px solid transparent;
    border-bottom-color: rgba(74, 222, 128, 0.25);
}

@keyframes tooltipFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.cli-manual {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 500;
    background: rgba(100, 116, 139, 0.12);
    color: var(--text-dim);
}

/* ─── Reference Answer ─── */
.reference-answer-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 4px 0;
}

.ref-device-block {
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(74, 222, 128, 0.12);
    background: rgba(0, 0, 0, 0.2);
}

.ref-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    font-weight: 600;
    font-size: 0.92rem;
    color: #86efac;
    background: rgba(74, 222, 128, 0.06);
    border-bottom: 1px solid rgba(74, 222, 128, 0.1);
}

.ref-copy-btn {
    background: rgba(74, 222, 128, 0.1);
    color: #86efac;
    border: 1px solid rgba(74, 222, 128, 0.2);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.ref-copy-btn:hover {
    background: rgba(74, 222, 128, 0.2);
    border-color: rgba(74, 222, 128, 0.4);
}

.ref-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    line-height: 1.65;
    color: #4ade80;
    padding: 14px 18px;
    margin: 0;
    overflow-x: auto;
    white-space: pre;
    scrollbar-width: thin;
    scrollbar-color: rgba(74,222,128,0.15) transparent;
}

.ref-code::-webkit-scrollbar {
    height: 4px;
}

.ref-code::-webkit-scrollbar-thumb {
    background: rgba(74,222,128,0.15);
    border-radius: 2px;
}

.ref-prompt {
    color: #67e8f9;
}

.ref-comment {
    color: rgba(148, 163, 184, 0.6);
    font-style: italic;
}

.ref-line {
    position: relative;
    display: inline-block;
}

.ref-line[data-full-cmd] {
    cursor: help;
    text-decoration: underline dashed rgba(255, 255, 255, 0.2);
    text-underline-offset: 4px;
}

.ref-line[data-full-cmd]:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
}

.ref-line[data-full-cmd]:hover::after {
    content: attr(data-full-cmd);
    position: absolute;
    left: 0;
    bottom: 100%;
    margin-bottom: 8px;
    background: #0f172a;
    color: #86efac;
    padding: 6px 12px;
    border: 1px solid #065f46;
    border-radius: 6px;
    white-space: pre;
    font-family: 'JetBrains Mono', Courier, monospace;
    font-size: 0.85rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    z-index: 50;
    pointer-events: none;
    line-height: 1.4;
}

.ref-line[data-full-cmd]:hover::before {
    content: '';
    position: absolute;
    left: 16px;
    bottom: 100%;
    margin-bottom: 2px;
    border-width: 6px 6px 0 6px;
    border-style: solid;
    border-color: #065f46 transparent transparent transparent;
    z-index: 51;
    pointer-events: none;
}

.ref-pc {
    border-color: rgba(148, 163, 184, 0.15);
    background: rgba(0, 0, 0, 0.12);
}

.ref-pc .ref-header {
    color: var(--text-secondary);
    background: rgba(100, 116, 139, 0.06);
    border-bottom-color: rgba(148, 163, 184, 0.1);
}

.ref-code-pc {
    color: var(--text-muted);
    padding: 10px 18px;
}

.ref-cmd {
    cursor: copy;
    transition: background-color 0.2s, color 0.2s;
}

.ref-cmd:hover {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
}

.copy-tooltip {
    position: fixed;
    background: #0f172a;
    color: #86efac;
    padding: 3px 8px;
    border-radius: 4px;
    border: 1px solid #065f46;
    font-size: 11px;
    pointer-events: none;
    z-index: 9999;
    box-shadow: 0 4px 6px rgba(0,0,0,0.5);
    transition: opacity 0.3s;
    font-family: 'Inter', sans-serif;
}

/* ─── Badge ─── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge.correct {
    background: rgba(34,197,94,0.12);
    color: var(--accent-green);
}

.badge.incorrect {
    background: rgba(239,68,68,0.12);
    color: var(--accent-red);
}

.badge.not_checked {
    background: rgba(100,116,139,0.12);
    color: var(--text-dim);
}

/* ─── Empty State ─── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state .text {
    font-size: 0.95rem;
}

/* ─── Search & Filter ─── */
.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.search-input {
    flex: 1;
    padding: 8px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.search-input::placeholder {
    color: var(--text-dim);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .app-container {
        padding: 12px;
    }
    
    .app-header {
        padding: 24px 12px;
    }
    
    .app-header h1 {
        font-size: 1.4rem;
    }
    
    .results-layout {
        grid-template-columns: 1fr;
    }
    
    .score-panel {
        position: static;
    }
    
    .tree-table-header,
    .tree-node-header {
        grid-template-columns: 1fr 80px 50px 80px;
    }
    
    .tabs-nav {
        overflow-x: auto;
    }
    
    .file-info-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .file-info-bar .btn-new {
        margin-left: 0;
        margin-top: 8px;
    }
}

/* ─── Animations ─── */
@keyframes slideDown {
    from { max-height: 0; opacity: 0; }
    to { max-height: 2000px; opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

/* ─── Percentage color utility ─── */
.pct-excellent { color: var(--accent-green); }
.pct-good { color: var(--accent-blue-light); }
.pct-fair { color: var(--accent-yellow); }
.pct-poor { color: var(--accent-orange); }
.pct-fail { color: var(--accent-red); }

/* ─── Tooltip ─── */
[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    color: var(--text-secondary);
    white-space: nowrap;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

/* ─── Notification toast ─── */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.toast.success {
    border-left: 3px solid var(--accent-green);
}

.toast.error {
    border-left: 3px solid var(--accent-red);
}

/* ─── Footer ─── */
.app-footer {
    margin-top: 60px;
    padding: 30px 0 10px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.footer-tag {
    color: var(--accent-blue);
    font-weight: 700;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .app-footer {
        margin-top: 40px;
        padding-bottom: 20px;
    }
}