:root {
    --bg-dark: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: rgba(30, 41, 59, 0.6);
    /* More transparent */
    --card-border: rgba(255, 255, 255, 0.08);
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.4);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --danger: #ef4444;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    background-image:
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--accent), #2563eb);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.brand h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.nav-links li {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1.25rem;
    border-radius: 12px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    font-weight: 500;
    border: 1px solid transparent;
}

.nav-links li:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-links li.active {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    border-color: rgba(59, 130, 246, 0.2);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2.5rem;
    overflow-y: auto;
    position: relative;
    /* Custom Scrollbar */
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

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

.main-content::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

/* Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Upload Cards Specifics */
.upload-card {
    background: rgba(30, 41, 59, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s;
}

.upload-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
    background: rgba(30, 41, 59, 0.5);
}

.drop-zone {
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

.drop-zone:hover {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
}

.drop-zone.drag-active {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    transform: scale(0.98);
}

/* Result Tabs */
.result-tabs {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: 12px;
    display: inline-flex;
    gap: 0.5rem;
    border: 1px solid var(--card-border);
    margin-bottom: 2rem;
}

.result-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.result-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.result-tab.active {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent);
    border-color: rgba(59, 130, 246, 0.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Disable old underline style */
.result-tab.active::after {
    display: none;
}

/* History Items */
.history-item {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--card-border);
}

.history-item:hover {
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(59, 130, 246, 0.3);
}

/* Settings Inputs */
input[type="text"] {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.85rem 1rem;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
    box-sizing: border-box;
    /* Fix width issues */
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent), #2563eb);
    color: white;
    border: none;
    padding: 0.85rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--accent-glow);
    transition: all 0.2s;
}

.primary-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

/* Loader */
.loader-overlay {
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}


body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: var(--sidebar-bg);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), #2563eb);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.brand h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-links li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-weight: 500;
}

/* Loader Animation */
.loader-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s, visibility 0s;
}

.loader-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0s 0.3s;
}

.nav-links li:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-links li.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background: radial-gradient(circle at top right, #1e293b 0%, #0f172a 40%);
    position: relative;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-header {
    margin-bottom: 2rem;
}

.tab-header h1 {
    font-size: 2rem;
    margin: 0 0 0.5rem 0;
    font-weight: 700;
}

.subtitle {
    color: var(--text-secondary);
    margin: 0;
}

/* Analysis Layout */
.analysis-container {
    max-width: 900px;
    margin: 0 auto;
}

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.upload-card {
    transition: transform 0.2s, border-color 0.2s;
    background: rgba(30, 41, 59, 0.4);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.card-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.upload-icon {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    transition: color 0.2s;
}

.drop-zone:hover .upload-icon {
    color: var(--accent);
}

.file-status {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 8px;
    color: var(--success);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: fadeIn 0.3s ease;
}

.file-status::before {
    content: '✓';
    font-weight: bold;
}

.action-area {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
}

.analyze-btn {
    background: linear-gradient(135deg, var(--accent), #2563eb);
    border: none;
    color: white;
    padding: 1rem 3rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--accent-glow);
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.analyze-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.analyze-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    background: #475569;
}

/* Results View */
.tab-header.with-back {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.result-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1px;
}

.result-tab {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}

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

.result-tab.active {
    color: var(--accent);
}

.result-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
    box-shadow: 0 -2px 8px var(--accent-glow);
}

.result-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.result-panel.active {
    display: block;
}

.preview-img,
#heatmap-img {
    max-width: 100%;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.heatmap-container {
    position: relative;
    display: inline-block;
}

.markdown-body {
    line-height: 1.7;
    font-size: 1rem;
    color: #e2e8f0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
    color: var(--accent);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    border-bottom: 1px solid rgba(59, 130, 246, 0.15);
    padding-bottom: 0.4rem;
}

.markdown-body h1 {
    font-size: 1.5rem;
}

.markdown-body h2 {
    font-size: 1.25rem;
}

.markdown-body h3 {
    font-size: 1.1rem;
    border-bottom: none;
}

.markdown-body h4 {
    font-size: 1rem;
    border-bottom: none;
    color: #94a3b8;
}

.markdown-body p {
    margin: 0.5rem 0;
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 1.5rem;
    margin: 0.5rem 0;
}

.markdown-body li {
    margin: 0.3rem 0;
    color: #cbd5e1;
}

.markdown-body strong,
.markdown-body b {
    color: #f1f5f9;
    font-weight: 600;
}

.markdown-body em,
.markdown-body i {
    color: #94a3b8;
}

.markdown-body code {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: #60a5fa;
}

.markdown-body pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.markdown-body blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    margin: 0.75rem 0;
    color: #94a3b8;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.75rem 0;
}

.markdown-body th,
.markdown-body td {
    padding: 0.5rem 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
}

.markdown-body th {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    font-weight: 600;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 1rem 0;
}

/* Progress Bar Loader */
.progress-container {
    width: 300px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #60a5fa);
    border-radius: 4px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Chip Group */
.chip-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}

.chip:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* Heatmap Legend */
.overlay-legend {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.gradient-bar {
    width: 200px;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(to right,
            rgba(0, 0, 255, 0.5),
            /* Blue */
            rgba(0, 255, 255, 0.7),
            /* Cyan */
            rgba(0, 255, 0, 0.8),
            /* Green */
            rgba(255, 255, 0, 0.9),
            /* Yellow */
            rgba(255, 0, 0, 1.0)
            /* Red */
        );
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.overlay-legend span {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== File Chips ===== */
.file-chips-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    min-height: 0;
}

.file-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.6rem 0.35rem 0.35rem;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 20px;
    font-size: 0.82rem;
    color: var(--text-primary);
    animation: chipIn 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    transition: all 0.2s ease;
    max-width: 220px;
}

.file-chip:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
}

.file-chip.removing {
    animation: chipOut 0.2s forwards;
}

.file-chip-thumbnail {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.15);
    flex-shrink: 0;
}

.file-chip-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-chip-icon svg {
    width: 14px;
    height: 14px;
}

.file-chip-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.file-chip-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 2px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    font-size: 14px;
    line-height: 1;
}

.file-chip-remove:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

@keyframes chipIn {
    from {
        opacity: 0;
        transform: scale(0.8) translateY(4px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes chipOut {
    from {
        opacity: 1;
        transform: scale(1);
    }

    to {
        opacity: 0;
        transform: scale(0.7);
    }
}

/* Drop zone file count badge */
.drop-zone-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.6rem;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 12px;
    color: var(--success);
    font-size: 0.78rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

/* ===== ECG Selector Pills (Results View) ===== */
.ecg-selector-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.ecg-selector-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--card-border);
    border-radius: 25px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ecg-selector-pill:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.ecg-selector-pill.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
    color: var(--accent);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.ecg-selector-pill-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

/* ===== Analysis Progress Overlay ===== */
.analysis-progress-text {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 500;
}

/* ===== Dashboard Grid for per-ECG results ===== */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.full-height {
    min-height: 200px;
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 800px;
}

.scrollable-text {
    max-height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    font-family: 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    color: var(--text-secondary);
}

/* Circle loader */
.circle-loader {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1rem;
}

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

/* ===== Image Lightbox ===== */
.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.lightbox-window {
    background: var(--sidebar-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
    width: 85vw;
    height: 85vh;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.lightbox-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.lightbox-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #e2e8f0;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.lightbox-btn:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: scale(1.05);
}

.lightbox-close-btn:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: rgba(239, 68, 68, 0.4);
}

.lightbox-image-wrapper {
    flex: 1;
    overflow: hidden;
    position: relative;
    cursor: grab;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-image-wrapper:active {
    cursor: grabbing;
}

.lightbox-image-wrapper img {
    max-width: none;
    max-height: none;
    user-select: none;
    -webkit-user-drag: none;
    transform-origin: center center;
    will-change: transform;
}

/* ===== Clickable images ===== */
.preview-img,
#heatmap-img {
    cursor: zoom-in;
    transition: opacity 0.2s;
}

.preview-img:hover,
#heatmap-img:hover {
    opacity: 0.85;
}

/* ===== Scrollable text panels ===== */
.markdown-body {
    line-height: 1.7;
    font-size: 1rem;
    color: #e2e8f0;
    max-height: calc(100vh - 220px);
    overflow-y: auto;
    word-wrap: break-word;
    padding-right: 0.5rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.markdown-body::-webkit-scrollbar {
    width: 5px;
}

.markdown-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

.scrollable-text {
    max-height: calc(100vh - 220px);
    overflow-y: auto;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    font-family: 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-secondary);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.scrollable-text::-webkit-scrollbar {
    width: 5px;
}

.scrollable-text::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}