/* ============================================================
   DR Concept Density Explorer — Clinical Observatory Theme
   Font: DM Sans + JetBrains Mono
   Palette: Deep obsidian, teal accents, clinical precision
   ============================================================ */

/* --- Design Tokens --- */
:root {
    /* Obsidian depth scale */
    --bg-root: #0f172a;
    --bg-surface: #0f1320;
    --bg-elevated: #151a2b;
    --bg-card: #1e293b;
    --bg-input: #111626;

    /* Borders & separators */
    --border-subtle: rgba(255, 255, 255, 0.05);
    --border-default: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(56, 189, 198, 0.3);
    --border-panel: #e2e8f0;
    --border-panel-dark: #334155;

    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #8892a8;
    --text-tertiary: #545e74;
    --text-muted: #3a4258;

    /* Accent — clinical teal */
    --accent: #38bdc6;
    --accent-dim: rgba(56, 189, 198, 0.15);
    --accent-glow: rgba(56, 189, 198, 0.08);
    --accent-hover: #4dd4dc;

    /* Concept colors */
    --concept-ma: #1f77b4;  /* Microaneurysms — dark blue */
    --concept-he: #d62728;  /* Hemorrhages — bright red */
    --concept-se: #ff7f0e;  /* Soft Exudates — orange */
    --concept-ex: #2ca02c;  /* Hard Exudates — green */

    /* Transition state colors */
    --transition-stable: #10b981;    /* no change */
    --transition-downgrade: #f59e0b; /* higher DR → lower */
    --transition-upgrade: #ef4444;   /* lower DR → higher */

    /* DR severity scale */
    --dr-0: #34d399;
    --dr-1: #fbbf24;
    --dr-2: #f97316;
    --dr-3: #ef4444;
    --dr-4: #a855f7;

    /* Functional */
    --success: #34d399;
    --danger: #ef4444;

    /* Spacing */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    /* Fonts */
    --font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;

    /* Glass effect */
    --glass-bg: rgba(15, 19, 32, 0.7);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-blur: blur(20px);
}

/* --- Light mode overrides --- */
[data-theme="light"],
.light {
    --bg-root: #f8fafc;
    --bg-surface: #f1f5f9;
    --bg-elevated: #e2e8f0;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-default: rgba(0, 0, 0, 0.10);
    --border-panel: #e2e8f0;
}

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

/* --- Background grain texture --- */
.bg-noise {
    position: fixed;
    inset: 0;
    z-index: -1;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-size: 200px;
    pointer-events: none;
}

/* --- Body --- */
body {
    font-family: var(--font-body);
    background: var(--bg-root);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Header --- */
header {
    background: var(--bg-surface);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-default);
    position: relative;
    z-index: 20;
}

header::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent) 20%, var(--accent) 80%, transparent);
    opacity: 0.2;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-icon {
    color: var(--accent);
    display: flex;
    animation: pulse-subtle 4s ease-in-out infinite;
}

@keyframes pulse-subtle {

    0%,
    100% {
        opacity: 0.8;
    }

    50% {
        opacity: 1;
    }
}

header h1 {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

header .subtitle {
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--text-tertiary);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.header-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-weight: 400;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px rgba(52, 211, 153, 0.4);
    animation: status-blink 3s ease-in-out infinite;
}

@keyframes status-blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* --- Main Layout --- */
main {
    display: grid;
    grid-template-columns: 260px 1fr;
    height: calc(100vh - 56px);
    overflow: hidden;
    transition: grid-template-columns 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

main.sidebar-collapsed {
    grid-template-columns: 42px 1fr;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
#sidebar {
    background: var(--bg-surface);
    border-right: 1px solid var(--border-default);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-shrink: 0;
}

.sidebar-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    transition: opacity 0.15s, width 0.22s;
}

#sidebar-collapse-btn {
    flex-shrink: 0;
    background: none;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, border-color 0.15s, transform 0.22s;
}

#sidebar-collapse-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent);
}

/* Collapsed state */
main.sidebar-collapsed .sidebar-title {
    opacity: 0;
    width: 0;
    pointer-events: none;
}

main.sidebar-collapsed #sidebar-collapse-btn {
    transform: rotate(180deg);
}

main.sidebar-collapsed .sidebar-controls,
main.sidebar-collapsed #image-grid,
main.sidebar-collapsed .sidebar-footer {
    display: none;
}

.sidebar-controls {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-group label {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.select-wrapper {
    position: relative;
}

.select-wrapper select {
    width: 100%;
    padding: 8px 30px 8px 12px;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.8rem;
    cursor: pointer;
    appearance: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.select-wrapper select:hover {
    border-color: var(--border-strong);
}

.select-wrapper select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.select-chevron {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

/* Custom checkbox */
.seg-filter-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.78rem;
    color: var(--text-secondary);
    user-select: none;
}

.seg-filter-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--border-strong);
    border-radius: 4px;
    background: var(--bg-input);
    position: relative;
    flex-shrink: 0;
    transition: all 0.2s;
}

.seg-filter-label input:checked+.checkbox-custom {
    background: var(--accent);
    border-color: var(--accent);
}

.seg-filter-label input:checked+.checkbox-custom::after {
    content: "";
    position: absolute;
    left: 4px;
    top: 1px;
    width: 5px;
    height: 9px;
    border: solid var(--bg-root);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Image grid */
#image-grid {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: min-content;
    gap: 8px;
    align-content: start;
}

#image-grid .thumb {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    min-height: 0;
    background: var(--bg-elevated);
}

#image-grid .thumb:hover {
    border-color: var(--accent);
    transform: scale(1.03);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

#image-grid .thumb.selected {
    border-color: var(--accent);
    box-shadow:
        0 0 0 2px var(--accent-dim),
        0 4px 20px rgba(56, 189, 198, 0.15);
}

#image-grid .thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: filter 0.2s;
}

#image-grid .thumb:hover img {
    filter: brightness(1.08);
}

#image-grid .thumb .dr-label {
    position: absolute;
    bottom: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 500;
    padding: 2px 6px;
    border-radius: var(--radius-sm) 0 0 0;
    letter-spacing: 0.02em;
}

.sidebar-footer {
    padding: 10px 12px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

#sidebar-status {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 400;
    color: var(--text-tertiary);
    text-align: center;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
#content {
    padding: 14px 18px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-width: 0;
}

/* Top bar: concept tabs + image info */
.content-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

/* --- Concept Tabs --- */
#concept-tabs {
    display: flex;
    gap: 6px;
}

.concept-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 500;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    overflow: hidden;
}

.concept-tab::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-glow), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.concept-tab:hover {
    border-color: var(--border-accent);
    color: var(--text-primary);
}

.concept-tab:hover::before {
    opacity: 1;
}

.concept-tab.active {
    background: var(--bg-card);
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 20px var(--accent-dim), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.concept-tab.active::before {
    opacity: 1;
}

/* Per-concept active state: background, border, and text use concept color */
.concept-tab[data-concept="ma"].active {
    background: var(--concept-ma);
    border-color: var(--concept-ma);
    box-shadow: 0 0 20px rgba(31, 119, 180, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.concept-tab[data-concept="he"].active {
    background: var(--concept-he);
    border-color: var(--concept-he);
    box-shadow: 0 0 20px rgba(214, 39, 40, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.concept-tab[data-concept="se"].active {
    background: var(--concept-se);
    border-color: var(--concept-se);
    box-shadow: 0 0 20px rgba(255, 127, 14, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.concept-tab[data-concept="ex"].active {
    background: var(--concept-ex);
    border-color: var(--concept-ex);
    box-shadow: 0 0 20px rgba(44, 160, 44, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

/* Inactive tabs: concept color as text/border hint */
.concept-tab[data-concept="ma"]:not(.active) {
    color: var(--text-secondary);
    border-color: var(--border-default);
}

.concept-tab[data-concept="ma"]:not(.active):hover {
    border-color: var(--concept-ma);
    color: var(--concept-ma);
}

.concept-tab[data-concept="he"]:not(.active):hover {
    border-color: var(--concept-he);
    color: var(--concept-he);
}

.concept-tab[data-concept="se"]:not(.active):hover {
    border-color: var(--concept-se);
    color: var(--concept-se);
}

.concept-tab[data-concept="ex"]:not(.active):hover {
    border-color: var(--concept-ex);
    color: var(--concept-ex);
}

/* Disabled state */
.concept-tab:disabled,
.concept-tab[disabled] {
    color: #64748b;
    border-color: var(--border-subtle);
    cursor: not-allowed;
    opacity: 0.5;
}

.tab-label {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

.concept-tab.active .tab-label {
    color: inherit;
}

.tab-fullname {
    font-size: 0.72rem;
    color: var(--text-tertiary);
    font-weight: 400;
}

.concept-tab.active .tab-fullname {
    color: rgba(255, 255, 255, 0.75);
}

.density-badge {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 400;
    color: var(--text-tertiary);
    margin-left: 2px;
}

.concept-tab.active .density-badge {
    color: rgba(255, 255, 255, 0.7);
    opacity: 0.9;
}

/* Focus states */
.concept-tab[data-concept="ma"]:focus {
    outline: 2px solid var(--concept-ma);
    outline-offset: 2px;
}

.concept-tab[data-concept="he"]:focus {
    outline: 2px solid var(--concept-he);
    outline-offset: 2px;
}

.concept-tab[data-concept="se"]:focus {
    outline: 2px solid var(--concept-se);
    outline-offset: 2px;
}

.concept-tab[data-concept="ex"]:focus {
    outline: 2px solid var(--concept-ex);
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Segmentation indicator */
.seg-indicator {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-muted);
    flex-shrink: 0;
    transition: all 0.3s;
}

.seg-indicator.available {
    background: var(--success);
    box-shadow: 0 0 6px rgba(52, 211, 153, 0.5);
}

.seg-indicator.unavailable {
    background: var(--text-muted);
}

/* Image info */
#image-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--text-tertiary);
    padding: 6px 14px;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
}

#image-info.hidden {
    display: none;
}

.info-sep {
    color: var(--text-muted);
}

/* ============================================================
   VIEWER AREA — 3:1 grid (canvas : controls)
   ============================================================ */
#viewer-area {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 18px;
    align-items: start;
}

#canvas-wrapper {
    position: relative;
    min-width: 0;
}

#canvas-wrapper::before {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: calc(var(--radius-lg) + 1px);
    background: linear-gradient(135deg, var(--accent) 0%, transparent 40%, transparent 60%, rgba(56, 189, 198, 0.2) 100%);
    opacity: 0.25;
    z-index: 0;
    pointer-events: none;
}

#canvas-container {
    position: relative;
    /*
     * Keep the canvas square and always within the visible viewport.
     * header=56px, content-padding=28px, concept-tabs≈42px, gaps=28px → ~154px of chrome.
     * min() picks whichever is smaller: the column width OR the usable viewport height,
     * so the 1:1 aspect-ratio never causes the canvas to overflow below the fold.
     */
    width: min(100%, calc(100vh - 154px));
    aspect-ratio: 1 / 1;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    z-index: 1;
    box-shadow:
        0 0 0 1px var(--border-default),
        0 8px 40px rgba(0, 0, 0, 0.5),
        0 2px 8px rgba(0, 0, 0, 0.3);
}

#canvas-bg,
#canvas-ui {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#canvas-ui {
    cursor: crosshair;
}

/* Canvas placeholder */
#canvas-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.88rem;
}

#canvas-placeholder svg {
    color: var(--text-muted);
}

/* Canvas spinner */
#canvas-spinner {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 10;
}

#canvas-spinner.hidden {
    display: none;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 2.5px solid rgba(255, 255, 255, 0.08);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

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

#spinner-text {
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 400;
}

/* ============================================================
   RIGHT PANEL (Controls + Predictions)
   ============================================================ */
#right-panel {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
    overflow-y: auto;
    max-height: calc(100vh - 130px);
}

/* --- Controls --- */
#controls {
    flex: 0 0 auto;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    font-size: 0.78rem;
}

.controls-sliders {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.controls-toggles {
    padding: 2px 0;
}

.controls-actions {
    display: flex;
    flex-direction: row;
    gap: 8px;
}

.controls-actions .btn {
    flex: 1;
}

.panel-section-title {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: -4px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.74rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.control-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 2px 8px;
    border-radius: 4px;
}

.control-value small {
    font-size: 0.65rem;
    color: var(--text-tertiary);
    margin-left: 1px;
}

/* Custom range slider */
.control-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    border: 1px solid var(--border-subtle);
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px rgba(56, 189, 198, 0.3), 0 2px 4px rgba(0, 0, 0, 0.3);
    border: 2px solid var(--bg-root);
    transition: transform 0.15s, box-shadow 0.15s;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 14px rgba(56, 189, 198, 0.4), 0 2px 6px rgba(0, 0, 0, 0.3);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px rgba(56, 189, 198, 0.3), 0 2px 4px rgba(0, 0, 0, 0.3);
    border: 2px solid var(--bg-root);
}

.control-divider {
    height: 1px;
    background: var(--border-subtle);
    margin: 2px 0;
}

/* Toggle switch */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
}

.toggle-label input {
    display: none;
}

.toggle-track {
    width: 36px;
    height: 20px;
    background: var(--bg-input);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    position: relative;
    flex-shrink: 0;
    transition: all 0.25s;
}

.toggle-thumb {
    width: 14px;
    height: 14px;
    background: var(--text-tertiary);
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.toggle-label input:checked+.toggle-track {
    background: var(--accent-dim);
    border-color: var(--accent);
}

.toggle-label input:checked+.toggle-track .toggle-thumb {
    left: 18px;
    background: var(--accent);
    box-shadow: 0 0 6px rgba(56, 189, 198, 0.4);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.76rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.22, 1, 0.36, 1);
    border: none;
    outline: none;
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-root);
    font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px rgba(56, 189, 198, 0.25);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    border-color: var(--border-strong);
    color: var(--text-primary);
    background: var(--bg-card);
}

.btn-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* ============================================================
   PREDICTION PANEL
   --------------------------------- | Predictions | | ┌─ Original ─┐ ┌─ After ────┐| | │ DR 2 │ │ DR 1 │| | │ ████░░░░░░ │ │ ██░░░░░░░░ │| | │ ... │ │ ... │| | └────────────┘ └────────────┘| ---------------------------------
   ============================================================ */
/* Target by id or class to avoid accidental element-selector collisions */
#prediction-panel,
.prediction-panel {
    margin-top: 0 !important;
    flex: 0 0 auto;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 14px;
    display: flex !important;
    flex-direction: column;
    gap: 10px;
}

.pred-cards-row {
    display: flex;
    flex-direction: row;
    gap: 14px;
    flex: 1;
    align-items: stretch;
    /* ensure children stretch to same height */
}

.pred-cards-row .pred-card {
    flex: 1 1 0;
    min-width: 0;

    /* consistent spacing and stretching */
    margin: 0;
    align-self: stretch;
}

.pred-card {
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: border-color 0.3s;
    display: flex;
    flex-direction: column;
}

.pred-card-masked {
    border-style: dashed;
}

.pred-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.pred-card h3 {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
}

.pred-card-icon {
    color: var(--text-muted);
}

.pred-class {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 14px;
    letter-spacing: 0.01em;
    color: var(--text-primary);
}

/* Probability bars */
.pred-bars .bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    font-size: 0.75rem;
}

.pred-bars .bar-label {
    width: 36px;
    text-align: right;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
}

.pred-bars .bar-track {
    flex: 1;
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-subtle);
}

.pred-bars .bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}

.pred-bars .bar-fill::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.15) 0%, transparent 100%);
    border-radius: 4px;
}

.pred-bars .bar-value {
    width: 80px;
    text-align: right;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 400;
    font-variant-numeric: tabular-nums;
    color: var(--text-secondary);
}

/* DR class bar colors */
.bar-dr-0 {
    background: var(--dr-0);
}

.bar-dr-1 {
    background: var(--dr-1);
}

.bar-dr-2 {
    background: var(--dr-2);
}

.bar-dr-3 {
    background: var(--dr-3);
}

.bar-dr-4 {
    background: var(--dr-4);
}

/* Muted text helper */
.muted {
    font-size: 0.74rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Inline control row (label + input pairs on one line) */
.control-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    font-size: 0.74rem;
    color: var(--text-secondary);
}

.control-row label {
    font-size: 0.74rem;
    color: var(--text-secondary);
}

.control-row input[type="number"],
.control-row select {
    width: 72px;
    padding: 4px 8px;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.74rem;
    outline: none;
}

.control-row select {
    width: 90px;
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================================
   LOAD ANIMATION (staggered entrance)
   ============================================================ */
@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

.content-top-bar {
    animation: fade-up 0.5s ease both;
    animation-delay: 0.1s;
}

#viewer-area {
    animation: fade-up 0.5s ease both;
    animation-delay: 0.2s;
}

#sidebar {
    animation: fade-up 0.4s ease both;
}

/* ============================================================
   RESPONSIVE TWEAKS
   ============================================================ */
@media (max-width: 1280px) {
    #right-panel {
        min-width: 280px;
    }
}

/* ============================================================
   PAPER-READY EVALUATION TABLES
   ============================================================ */
.paper-table-title {
    margin: 12px 0 4px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.paper-table-wrap {
    overflow-x: auto;
    margin-bottom: 4px;
}

.paper-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11.5px;
    line-height: 1.35;
}

.paper-table th,
.paper-table td {
    border: 1px solid var(--border-default);
    padding: 5px 8px;
    text-align: center;
    vertical-align: middle;
}

.paper-table thead th {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 11px;
    white-space: nowrap;
}

.paper-table tbody th {
    background: var(--bg-elevated);
    text-align: left;
    font-weight: 500;
    color: var(--accent);
    white-space: nowrap;
}

.paper-table td {
    background: var(--bg-card);
    color: var(--text-primary);
}

.paper-table td small {
    display: block;
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.paper-table td.paper-cell-empty {
    color: var(--text-muted);
    font-size: 13px;
}

.paper-table td.paper-cell-bold {
    color: var(--accent);
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Selection color */
::selection {
    background: var(--accent-dim);
    color: var(--text-primary);
}