/* RataFold — futuristic dark theme */

:root {
    --bg-base: #0a0e1a;
    --bg-card: #0f1626;
    --bg-elevated: #161e30;
    --border: #1f2a44;
    --text-primary: #e5e7eb;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-purple: #a855f7;
    --accent-amber: #f59e0b;
    --accent-red: #ef4444;
    --accent-blue: #3b82f6;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
}

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

body {
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        radial-gradient(at 20% 0%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
        radial-gradient(at 80% 100%, rgba(168, 85, 247, 0.08) 0px, transparent 50%);
}

a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─────────── NAV ─────────── */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 32px;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    background: rgba(10, 14, 26, 0.7);
    position: sticky;
    top: 0;
    z-index: 100;
}
.brand {
    font-family: var(--font-mono);
    font-weight: 800;
    font-size: 18px;
    letter-spacing: 2px;
    color: var(--text-primary);
}
.brand-mark {
    color: var(--accent-cyan);
}
.brand-tag {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-left: 10px;
}
.nav-links a {
    margin-left: 24px;
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}
.nav-links a:hover { color: var(--accent-cyan); text-decoration: none; }

/* ─────────── HERO ─────────── */
.hero {
    max-width: 1100px;
    margin: 80px auto 40px;
    padding: 0 32px;
    text-align: center;
}
.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--accent-cyan);
    opacity: 0.75;
    margin-bottom: 18px;
}
.hero h1 {
    font-family: var(--font-mono);
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 10px;
    background: linear-gradient(180deg, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero h1 .accent { color: var(--accent-cyan); -webkit-text-fill-color: var(--accent-cyan); }
.hero-sub {
    font-family: var(--font-mono);
    font-size: clamp(16px, 2.4vw, 22px);
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    font-style: italic;
    margin: 0 0 28px;
    opacity: 0.85;
}
.hero .lead {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 720px;
    margin: 0 auto 36px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin: 40px 0;
    flex-wrap: wrap;
}
.stat-box {
    text-align: center;
}
.stat-box .number {
    font-family: var(--font-mono);
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-cyan);
    display: block;
}
.stat-box .label {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
}

/* ─────────── SEARCH ─────────── */
.search-wrap {
    max-width: 700px;
    margin: 32px auto 60px;
    padding: 0 32px;
    position: relative;
}
.search-input {
    width: 100%;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 18px 24px;
    font-family: var(--font-mono);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s;
}
.search-input:focus {
    border-color: var(--accent-cyan);
}
.search-input::placeholder { color: var(--text-muted); }
.search-results {
    position: absolute;
    top: calc(100% + 8px);
    left: 32px;
    right: 32px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 10;
    display: none;
}
.search-results.visible { display: block; }
.search-result {
    padding: 14px 20px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background 0.1s;
}
.search-result:hover { background: var(--bg-card); }
.search-result:last-child { border-bottom: none; }
.search-result .name {
    font-weight: 600;
    color: var(--text-primary);
}
.search-result .meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ─────────── FEATURED ─────────── */
.featured-section {
    max-width: 1100px;
    margin: 60px auto;
    padding: 0 32px;
}
.featured-section h2 {
    font-family: var(--font-mono);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--text-muted);
    margin-bottom: 24px;
}
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.featured-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: transform 0.15s, border-color 0.15s;
}
.featured-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-cyan);
}
.featured-card .id {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent-cyan);
    letter-spacing: 1px;
}
.featured-card .name {
    font-size: 18px;
    font-weight: 700;
    margin: 6px 0;
}
.featured-card .card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 8px 0 4px;
}
.cat-tag {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.3px;
    border: 1px solid transparent;
    text-transform: none;
}
.cat-tag.tag-cyan {
    background: rgba(6, 182, 212, 0.12);
    color: var(--accent-cyan);
    border-color: rgba(6, 182, 212, 0.4);
}
.cat-tag.tag-purple {
    background: rgba(168, 85, 247, 0.12);
    color: var(--accent-purple);
    border-color: rgba(168, 85, 247, 0.4);
}
.cat-tag.tag-amber {
    background: rgba(245, 158, 11, 0.12);
    color: var(--accent-amber);
    border-color: rgba(245, 158, 11, 0.4);
}
.cat-tag.tag-red {
    background: rgba(239, 68, 68, 0.12);
    color: var(--accent-red);
    border-color: rgba(239, 68, 68, 0.4);
}
.cat-tag.tag-green {
    background: rgba(16, 185, 129, 0.12);
    color: var(--accent-green);
    border-color: rgba(16, 185, 129, 0.4);
}
.cat-tag.tag-muted {
    background: var(--bg-elevated);
    color: var(--text-muted);
    border-color: var(--border);
}
.featured-card .meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 8px;
}
.featured-card .meta .card-stat-num {
    color: #ffffff;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* ─────────── FOOTER ─────────── */
.footer-tagline {
    font-size: 12px;
    color: var(--accent-cyan);
    letter-spacing: 1.5px;
    font-style: italic;
    margin-bottom: 10px;
    opacity: 0.85;
}
.footer {
    max-width: 1100px;
    margin: 80px auto 40px;
    padding: 24px 32px;
    border-top: 1px solid var(--border);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* ─────────── PROTEIN PAGE ─────────── */
/* ─────────── SCI-FI HUD HERO (Stage 1 redesign) ─────────── */
.hero-hud {
    position: relative;
    max-width: 1280px;
    margin: 16px auto 16px;
    padding: 16px 32px 18px;
    background:
        linear-gradient(180deg, rgba(6, 182, 212, 0.04) 0%, transparent 100%),
        repeating-linear-gradient(0deg, transparent 0px, transparent 3px, rgba(6, 182, 212, 0.018) 3px, rgba(6, 182, 212, 0.018) 4px),
        var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 1px solid rgba(6, 182, 212, 0.4);
    border-bottom: 1px solid rgba(6, 182, 212, 0.15);
    clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
    font-family: var(--font-mono);
    overflow: hidden;
}
.hero-hud::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--accent-cyan) 50%, transparent 100%);
    opacity: 0.6;
}

.hud-back {
    display: inline-block;
    font-size: 10px;
    text-transform: lowercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.hud-back:hover { color: var(--accent-cyan); }

.hud-bracket {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 8px;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
}
.hud-label {
    color: var(--accent-cyan);
    opacity: 0.85;
}
.hud-id {
    color: var(--text-muted);
    padding: 3px 10px;
    border: 1px solid var(--border);
    background: rgba(6, 182, 212, 0.03);
}
.hud-status {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-green);
    padding: 3px 12px;
    border: 1px solid rgba(16, 185, 129, 0.35);
    background: rgba(16, 185, 129, 0.06);
    clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}
.hud-status-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 8px var(--accent-green);
    animation: hud-pulse 1.8s ease-in-out infinite;
}
@keyframes hud-pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

.hud-title {
    font-size: 30px;
    font-weight: 800;
    color: var(--text-primary);
    margin: 2px 0 4px;
    letter-spacing: -0.5px;
    text-transform: uppercase;
    line-height: 1.05;
}
.hud-shortname {
    color: var(--text-primary);
    background: linear-gradient(180deg, #ffffff, #d1d5db);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hud-divider {
    color: var(--accent-cyan);
    font-weight: 200;
    margin: 0 12px;
    opacity: 0.6;
}
.hud-genename {
    color: var(--accent-cyan);
    font-weight: 400;
    font-size: 22px;
}

.hud-subline {
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}
.hud-subline .hud-pipe {
    color: var(--border);
    margin: 0 10px;
}

.hud-story {
    max-width: 880px;
    font-family: var(--font-sans, system-ui, -apple-system, sans-serif);
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
    /* Keep the header lean: clamp the disease blurb to two lines. */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hud-tagrow {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}
.hud-tag {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent-cyan);
    padding: 4px 10px 4px 18px;
    background:
        linear-gradient(90deg, rgba(6, 182, 212, 0.18) 0%, rgba(6, 182, 212, 0.04) 100%);
    border: 1px solid rgba(6, 182, 212, 0.25);
    border-left: none;
    position: relative;
}
.hud-tag::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 10px;
    background: rgba(6, 182, 212, 0.25);
    clip-path: polygon(0 0, 100% 0, 0 100%);
}

.hud-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    padding-top: 10px;
    border-top: 1px dashed rgba(31, 42, 68, 0.6);
}
.hud-meta-item .hud-meta-key {
    color: var(--text-muted);
    opacity: 0.8;
}
.hud-meta-item .hud-meta-val {
    color: var(--text-primary);
    margin-left: 6px;
    text-transform: none;
    letter-spacing: 0.3px;
}

.hud-stats {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 2px;
    background: var(--border);
    border: 1px solid var(--border);
    padding: 2px;
}
@media (max-width: 900px) {
    .hud-stats { grid-template-columns: repeat(2, 1fr); }
    .hud-title { font-size: 28px; }
}
.hud-stat {
    background: rgba(10, 14, 26, 0.7);
    padding: 9px 14px;
    text-align: left;
    transition: background 0.15s;
}
.hud-stat:hover { background: rgba(6, 182, 212, 0.04); }
.hud-stat-label {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 1.8px;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.hud-stat-value {
    font-size: 20px;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.hud-stat-unit {
    margin-left: 4px;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
}
.hud-stat-sub {
    margin-top: 3px;
    font-size: 10px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}
.hud-stat-sub .accent { color: var(--accent-cyan); }
.hud-stat-sub .warn   { color: var(--accent-amber); }

.tag {
    display: inline-block;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
}
.tag {
    display: inline-block;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
}

/* ─────────── PROTEIN BODY ─────────── */
.protein-body {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
}
@media (max-width: 900px) {
    .protein-body { grid-template-columns: 1fr; }
}

.viewer-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
}
.viewer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.viewer-title {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}
.viewer-compare {
    display: flex;
    gap: 12px;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}
#molstar-container {
    width: 100%;
    height: 540px;
    border-radius: 8px;
    overflow: hidden;
    background: #000;
    position: relative;
}

.variant-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
    /* No flex / no max-height / no sticky. Stacks vertically; the variant
       list lives at the bottom and renders all rows. Page scrolls. */
}
.variant-panel-header {
    margin-bottom: 14px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
}
.variant-panel-header h3 {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.variant-panel-header .summary {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
}
.variant-list {
    margin-top: 8px;
    padding-right: 4px;     /* avoid scrollbar collision with rounded edges */
    border-top: 1px dashed var(--border);
    padding-top: 12px;
    /* Scrolls inside the variant panel — the list is row-dense and would
       otherwise push the rest of the page far below the viewer. Cap matches
       the Mol* container height (540px) so the right column lines up. */
    max-height: 540px;
    overflow-y: auto;
    /* Subtle scrollbar — visible on hover, recessed otherwise. */
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
.variant-list::-webkit-scrollbar { width: 8px; }
.variant-list::-webkit-scrollbar-track { background: transparent; }
.variant-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}
.variant-list::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
@media (max-width: 900px) {
    /* On narrow screens the layout stacks, so let the list breathe instead
       of a tiny inner scroll inside a single-column page. */
    .variant-list { max-height: none; overflow-y: visible; }
}
.variant-item {
    padding: 10px 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 4px;
    border: 1px solid transparent;
    transition: background 0.1s, border-color 0.1s;
}
.variant-item:hover {
    background: var(--bg-elevated);
}
.variant-item.active {
    background: var(--bg-elevated);
    border-color: var(--accent-cyan);
}
.variant-item.native {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--accent-green);
}
.variant-item.loading {
    background: var(--bg-elevated);
    border-color: var(--accent-cyan);
    position: relative;
    pointer-events: none;
}
.variant-item.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 10px;
    width: 12px;
    height: 12px;
    margin-top: -6px;
    border: 2px solid var(--border);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: vlo-spin 0.7s linear infinite;
}

/* Mol* viewer overlay shown during variant fetch */
.viewer-loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    z-index: 10;
    backdrop-filter: blur(2px);
    pointer-events: none;   /* click-through; just visual feedback */
}
.viewer-loading-overlay .vlo-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.15);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: vlo-spin 0.7s linear infinite;
}
.viewer-loading-overlay .vlo-text {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent-cyan);
}
@keyframes vlo-spin {
    to { transform: rotate(360deg); }
}
.variant-item .row1 {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 12px;
}
.variant-item .row1 .rank { color: var(--accent-cyan); font-weight: 700; }
.variant-item .row1 .energy { color: var(--text-primary); font-weight: 600; }
.variant-item .row2 {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 3px;
}
.variant-item .cat-twin       { color: var(--accent-green); }
.variant-item .cat-nearNative { color: var(--accent-cyan); }
.variant-item .cat-variant    { color: var(--accent-amber); }
.variant-item .cat-conformer  { color: var(--accent-purple); }
.variant-item .cat-outlier    { color: var(--accent-red); }

/* Sidechain-packing class tags (chi-only variants) — a descriptive pill,
   colour-coded by packing intensity. */
.variant-item .sc-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.2px;
    border: 1px solid transparent;
    white-space: nowrap;
}
.sc-tag.sc-rotameric { color: var(--accent-cyan);   background: rgba(6, 182, 212, 0.10);  border-color: rgba(6, 182, 212, 0.35); }
.sc-tag.sc-core      { color: var(--accent-green);  background: rgba(16, 185, 129, 0.12); border-color: rgba(16, 185, 129, 0.40); }
.sc-tag.sc-pocket    { color: var(--accent-purple); background: rgba(168, 85, 247, 0.12); border-color: rgba(168, 85, 247, 0.40); }
/* Legend dots for the sidechain classes + intro copy. */
.dot.sc-rotameric { background: var(--accent-cyan); }
.dot.sc-core      { background: var(--accent-green); }
.dot.sc-pocket    { background: var(--accent-purple); }
/* In a variant row the class dot is an inline indicator, not a legend bullet. */
.variant-item .row2 .dot { margin-top: 0; align-self: center; }
.legend-intro {
    margin: 8px 0 12px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-secondary);
}
.variant-item .stability-more-stable { color: var(--accent-green); }
.variant-item .stability-similar-stability { color: var(--text-muted); }
.variant-item .stability-less-stable { color: var(--accent-amber); }
.variant-item .stability-unstable { color: var(--accent-red); }

.variant-item .row3 {
    margin-top: 4px;
    font-family: var(--font-mono);
    font-size: 9px;
}
.af-badge {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 3px;
    font-weight: 700;
    letter-spacing: 0.5px;
    cursor: help;
}
.af-badge.af-af-confirmed {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}
.af-badge.af-af-plausible {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
}
.af-badge.af-af-divergent {
    background: rgba(239, 68, 68, 0.12);
    color: var(--accent-red);
    border: 1px solid var(--accent-red);
}
.af-badge.af-unknown {
    background: var(--bg-elevated);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* Stats banner */
.stats-banner {
    max-width: 1280px;
    margin: 24px auto;
    padding: 0 32px;
}
.stats-banner .row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
}
.stat-card .label {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.stat-card .value {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 700;
    color: var(--accent-cyan);
}
.stat-card .sub {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}
.stat-card.highlight {
    border-color: var(--accent-cyan);
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(168, 85, 247, 0.04));
}
.stat-card.beyond {
    border-color: var(--accent-purple);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(6, 182, 212, 0.04));
}

/* ─────────── RESPONSIBILITY PAGE ─────────── */
.resp-page {
    max-width: 820px;
    margin: 50px auto 80px;
    padding: 0 32px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.resp-title {
    font-family: var(--font-mono);
    font-size: 38px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -1px;
    margin-bottom: 12px;
}
.resp-lede {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 640px;
}
.resp-h2 {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin: 36px 0 12px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}
.resp-page p {
    margin-bottom: 14px;
}
.resp-page p code,
.resp-page li code {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent-cyan);
    background: var(--bg-elevated);
    padding: 1px 5px;
    border-radius: 3px;
}
.resp-list {
    margin: 8px 0 14px 24px;
    padding: 0;
    list-style: disc;
}
.resp-list-numbered {
    list-style: decimal;
}
.resp-list li {
    margin-bottom: 10px;
}
.resp-list strong { color: var(--text-primary); }
.resp-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0 18px;
    font-family: var(--font-mono);
    font-size: 12px;
}
.resp-table th,
.resp-table td {
    border: 1px solid var(--border);
    padding: 9px 12px;
    text-align: left;
    vertical-align: top;
}
.resp-table th {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 10px;
    letter-spacing: 1px;
    font-weight: 600;
}
.resp-table td strong { color: var(--text-primary); }
.resp-table-muted {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    background: var(--bg-card);
}
.resp-closing {
    margin-top: 40px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-style: italic;
}

/* Loading state */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
}

/* ─────────── VIEWER TOOLBAR (downloads / compare) ─────────── */
.viewer-toolbar {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;   /* compare → left · downloads → right */
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.tb-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 7px 12px;
    border-radius: 6px;
    cursor: pointer;
    letter-spacing: 0.3px;
    transition: background 0.1s, border-color 0.1s, color 0.1s;
}
.tb-btn:hover {
    background: rgba(6, 182, 212, 0.08);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}
.tb-btn:active {
    transform: scale(0.97);
}
.tb-ic {
    color: var(--accent-cyan);
    font-weight: 700;
    font-size: 13px;
}
.tb-divider {
    width: 1px;
    background: var(--border);
    margin: 0 4px;
    align-self: stretch;
}

/* ── Download Options dropdown (top-right of the 3D Structure section) ── */
.download-dropdown {
    position: relative;
    margin-left: auto;          /* hug the right edge when the row wraps */
}
.dl-toggle .dl-caret {
    font-size: 10px;
    color: var(--text-muted);
    transition: transform 0.15s;
}
.download-dropdown.open .dl-toggle {
    background: rgba(6, 182, 212, 0.08);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}
.download-dropdown.open .dl-caret { transform: rotate(180deg); }
.download-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 30;
    min-width: 248px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}
.download-dropdown.open .download-menu { display: flex; }
.download-menu .dl-item {
    width: 100%;
    justify-content: flex-start;
    background: transparent;
    border-color: transparent;
}
.download-menu .dl-item:hover {
    background: rgba(6, 182, 212, 0.08);
    border-color: var(--accent-cyan);
}
.dl-group-label {
    font-family: var(--font-mono);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 4px 6px 2px;
}
.dl-sep {
    height: 1px;
    background: var(--border);
    margin: 5px 2px;
}

/* ── PeerProof metric sheet (horizontal strip above the 3D viewer) ── */
.peerproof-bar {
    margin: 0 0 12px;
    padding: 12px 14px;
    background: linear-gradient(180deg, rgba(16, 185, 129, 0.05), rgba(15, 22, 38, 0.4));
    border: 1px solid var(--border);
    border-left: 2px solid var(--accent-green);
    border-radius: 10px;
}
.pp-head {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 10px;
}
.pp-title {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent-green);
    font-weight: 700;
}
.pp-sub {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-muted);
}
.pp-cells {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0;
}
.pp-cell {
    flex: 1 1 0;
    min-width: 120px;
    padding: 6px 14px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.pp-sep {
    width: 1px;
    background: var(--border);
    align-self: stretch;
    margin: 2px 0;
}
.pp-cell-label {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}
.pp-cell-value {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}
.pp-cell-tag {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-secondary);
}
.pp-cell.pp-ok .pp-cell-value { color: var(--accent-green); }
.pp-cell.pp-warn .pp-cell-value { color: var(--accent-amber); }
.pp-cell.pp-gated .pp-cell-value { color: var(--accent-purple); font-size: 16px; }
.pp-cell.pp-gated .pp-cell-tag { color: var(--accent-purple); }
.pp-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}
.pp-actions .tb-btn { font-size: 11px; }
@media (max-width: 720px) {
    .pp-cell { flex-basis: 45%; }
    .pp-sep { display: none; }
    .pp-actions .tb-btn { flex: 1 1 100%; justify-content: center; }
}

/* ─────────── CITATION SECTION ─────────── */
.cite-section {
    max-width: 1280px;
    margin: 40px auto 0;
    padding: 0 32px;
}
.cite-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
}
.cite-card h3 {
    font-family: var(--font-mono);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}
.cite-card p {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 14px;
}
#cite-block {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px 18px;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: 14px;
    overflow-x: auto;
    white-space: pre-wrap;
}

/* ─────────── VIEWER LEGEND ─────────── */
.viewer-legend {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.legend-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    font-family: var(--font-mono);
    font-size: 11px;
}
.legend-label {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 10px;
    min-width: 120px;
}
.legend-scale {
    display: inline-flex;
    gap: 6px;
    flex-wrap: wrap;
}
.lg-chip {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 3px;
    font-size: 10px;
    letter-spacing: 0.4px;
    border: 1px solid transparent;
    color: #fff;
    font-weight: 500;
}
.lg-plddt-veryhigh  { background: #0053D6; }
.lg-plddt-confident { background: #65CBF3; color: #0a0e1a; }
.lg-plddt-low       { background: #FFDB13; color: #0a0e1a; }
.lg-plddt-verylow   { background: #FF7D45; }
.lg-ss-helix {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--accent-red);
    color: var(--accent-red);
}
.lg-ss-sheet {
    background: rgba(245, 158, 11, 0.15);
    border-color: var(--accent-amber);
    color: var(--accent-amber);
}
.lg-ss-loop {
    background: rgba(148, 163, 184, 0.15);
    border-color: var(--text-secondary);
    color: var(--text-secondary);
}
.legend-hint {
    color: var(--text-muted);
    font-size: 11px;
    font-family: var(--font-mono);
    line-height: 1.5;
    margin-top: 2px;
}

/* ─────────── SEQUENCE TRACK + plDDT CHART ─────────── */
.seq-panel {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}
.seq-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.seq-panel-title {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}
.seq-panel-hint {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    min-height: 14px;
}
.plddt-chart {
    width: 100%;
    height: 80px;
    display: block;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 8px;
}
.seq-track {
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.6;
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    word-break: break-all;
    letter-spacing: 0.3px;
    overflow-x: hidden;
}
.seq-cell {
    display: inline-block;
    width: 13px;
    text-align: center;
    color: #fff;
    border-radius: 2px;
    margin: 1px 0;
    cursor: help;
    transition: transform 0.05s;
}
.seq-cell:hover {
    transform: scale(1.4);
    outline: 1px solid var(--accent-cyan);
    z-index: 1;
}
.seq-cell.plddt-veryhigh  { background: #0053D6; }
.seq-cell.plddt-confident { background: #65CBF3; color: #0a0e1a; }
.seq-cell.plddt-low       { background: #FFDB13; color: #0a0e1a; }
.seq-cell.plddt-verylow   { background: #FF7D45; }
.seq-cell.plddt-unknown   { background: var(--bg-elevated); color: var(--text-muted); }
.seq-tick {
    display: inline-block;
    padding: 0 6px;
    color: var(--text-muted);
    font-size: 9px;
    vertical-align: middle;
    user-select: none;
}

/* ─────────── DESIGN BRIEF PANEL (Phase 16) ─────────── */
.design-brief-panel {
    margin-bottom: 16px;
    padding: 12px 16px;
    background:
        linear-gradient(180deg, rgba(245, 158, 11, 0.06) 0%, transparent 100%),
        var(--bg-elevated);
    border: 1px solid var(--border);
    border-left: 2px solid var(--accent-amber);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
}
.design-brief-panel > summary {
    cursor: pointer;
    list-style: none;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 2px 24px 2px 0;
    user-select: none;
}
.design-brief-panel > summary::-webkit-details-marker { display: none; }
.design-brief-panel > summary::after {
    content: '▾';
    position: absolute;
    right: 0;
    top: 4px;
    color: var(--accent-amber);
    opacity: 0.7;
    transition: transform 0.2s;
}
.design-brief-panel:not([open]) > summary::after { transform: rotate(-90deg); }
.design-brief-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-amber);
}
.design-brief-headline {
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.45;
}
.design-brief-constraints {
    list-style: none;
    margin: 0 0 10px;
    padding: 0;
    color: var(--text-secondary);
    font-size: 10.5px;
    line-height: 1.6;
}
.design-brief-constraints li {
    padding-left: 14px;
    position: relative;
}
.design-brief-constraints li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    opacity: 0.7;
}
.design-brief-summary {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    padding-top: 8px;
    border-top: 1px dashed rgba(245, 158, 11, 0.3);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}
.design-brief-summary .ds-num {
    color: var(--text-primary);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}
.design-brief-summary .ds-num.candidate { color: var(--accent-green); }
.design-brief-summary .ds-num.partial   { color: var(--accent-amber); }
.design-brief-summary .ds-num.rejected  { color: var(--text-muted); }
.design-brief-redflag {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px dashed rgba(245, 158, 11, 0.3);
    font-size: 10px;
    color: var(--accent-amber);
    line-height: 1.45;
    opacity: 0.85;
}

/* ── ATLAS / DESIGNS mode toggle ── */
.variant-mode-toggle {
    display: flex;
    gap: 0;
    margin-top: 10px;
    padding: 2px;
    background: var(--bg-base);
    border: 1px solid var(--border);
    width: fit-content;
    border-radius: 3px;
}
.vm-btn {
    background: transparent;
    border: 0;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1.5px;
    padding: 5px 14px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}
.vm-btn:hover { color: var(--text-primary); }
.vm-btn.active {
    background: var(--accent-cyan);
    color: var(--bg-base);
    font-weight: 700;
}

/* ── per-variant DESIGN badge ── */
.variant-item .design-badge {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 6px;
    font-size: 9px;
    letter-spacing: 1px;
    border: 1px solid;
    border-radius: 2px;
    vertical-align: middle;
}
.variant-item .design-badge.candidate {
    color: var(--accent-green);
    border-color: rgba(16, 185, 129, 0.5);
    background: rgba(16, 185, 129, 0.08);
}
.variant-item .design-badge.partial {
    color: var(--accent-amber);
    border-color: rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.05);
}

/* ─────────── ENERGY BREAKDOWN PANEL (Phase 14) ─────────── */
.energy-breakdown {
    margin-top: 16px;
    padding: 12px 14px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
}
.energy-breakdown > summary {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    list-style: none;
}
.energy-breakdown > summary::-webkit-details-marker { display: none; }
.energy-breakdown-title {
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 10px;
}
.energy-breakdown-total {
    color: var(--text-primary);
    font-size: 12px;
}
.energy-breakdown-body {
    margin-top: 10px;
    display: grid;
    grid-template-columns: 1fr 60px 100px;
    gap: 4px 12px;
    align-items: center;
}
/* Phase 17c — tier summary (spans all three grid columns) */
.energy-tier-summary {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4px 14px;
    padding: 8px 10px 10px;
    margin-bottom: 6px;
    border: 1px solid var(--border);
    background: rgba(6, 182, 212, 0.04);
    border-radius: 4px;
    font-size: 11px;
}
.energy-tier-summary .tier-row {
    display: contents;
    cursor: help;
}
.energy-tier-summary .tier-name {
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}
.energy-tier-summary .tier-val {
    color: var(--text-primary);
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.energy-term-name {
    color: var(--text-secondary);
}
.energy-term-value {
    color: var(--text-primary);
    text-align: right;
    font-variant-numeric: tabular-nums;
}
.energy-term-bar {
    position: relative;
    height: 8px;
    background: var(--bg-base);
    border-radius: 2px;
    overflow: hidden;
}
.energy-term-bar-fill {
    position: absolute;
    top: 0;
    bottom: 0;
    background: var(--accent-cyan);
    opacity: 0.8;
}
.energy-term-bar-fill.positive { background: #FF7D45; }
.energy-term-bar-fill.negative { background: #65CBF3; }
.energy-breakdown-note {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    font-size: 10px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ─────────── VARIANT GUIDE / DISCOVER ─────────── */
.variant-guide, .variant-discover {
    margin-bottom: 14px;
    padding: 10px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.55;
    color: var(--text-secondary);
}
.variant-guide summary, .variant-discover summary {
    cursor: pointer;
    color: var(--accent-cyan);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 2px 0;
    user-select: none;
}
.variant-guide summary:hover, .variant-discover summary:hover {
    color: var(--text-primary);
}
.guide-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin-top: 10px;
}
.guide-row strong { color: var(--text-primary); font-weight: 600; }
.guide-row em { color: var(--text-muted); font-style: normal; font-size: 10px; }
.dot {
    flex-shrink: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-top: 5px;
    display: inline-block;
}
.dot.cat-twin       { background: var(--accent-green); }
.dot.cat-nearNative { background: var(--accent-cyan); }
.dot.cat-variant    { background: var(--accent-amber); }
.dot.cat-conformer  { background: var(--accent-purple); }
.dot.cat-outlier    { background: var(--accent-red); }

.variant-discover ul {
    margin: 8px 0 0 18px;
    padding: 0;
    list-style: disc;
}
.variant-discover li { margin-bottom: 5px; }
.discover-tip {
    margin-top: 8px;
    padding: 8px 10px;
    background: rgba(6, 182, 212, 0.06);
    border-left: 2px solid var(--accent-cyan);
    color: var(--text-secondary);
    font-size: 11px;
    border-radius: 0 4px 4px 0;
}

/* Sticky-viewport layout removed (it fought the DESIGN BRIEF panel). The
   variant list now renders all rows; the page scrolls. */
.variant-panel {
    align-self: start;
}