/* CtrlDogma UI layer -- flat, card-based layout. Loaded AFTER style.css and wins over its older
   glass/gradient styling. Tokens are keyed on Bootstrap's [data-bs-theme] attribute (set on both
   <html> and <body> by the theme toggle in base.html). */
:root, [data-bs-theme="light"] {
    color-scheme: light;
    --bg: #f4f8f6; --surface: #ffffff; --surface-2: #eaf2ee;
    --ink: #172f2a; --muted: #5f716a; --line: #dce7e1;
    --accent: #128665; --accent-strong: #0b684e; --accent-rgb: 18, 134, 101; --accent-soft: #e0f3eb; --on-accent: #ffffff;
    --teal: #147f78; --purple: #7657c7; --coral: #e7735d;
    --code-bg: #111d20; --code-head: #1b2a2d;
    --shadow: 0 18px 48px #123d3014;
    --font-ui: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-code: "DM Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

    --bs-body-bg: var(--bg); --bs-body-bg-rgb: 244, 248, 246;
    --bs-body-color: var(--ink); --bs-body-color-rgb: 23, 47, 42;
    --bs-body-font-family: var(--font-ui);
    --bs-secondary-color: var(--muted); --bs-secondary-bg: var(--surface-2);
    --bs-tertiary-bg: var(--surface-2); --bs-border-color: var(--line);
    --bs-link-color: var(--accent); --bs-link-hover-color: var(--accent-strong);
    --bs-primary: var(--accent); --bs-primary-rgb: 18, 134, 101;
    --bs-success: var(--accent); --bs-success-rgb: 18, 134, 101;
    --bs-font-monospace: var(--font-code);
}

[data-bs-theme="dark"] {
    color-scheme: dark;
    --bg: #171f25; --surface: #202b32; --surface-2: #27363d;
    --ink: #e2ebeb; --muted: #a0b0b2; --line: #394950;
    --accent: #58cdb0; --accent-strong: #83dfc7; --accent-rgb: 88, 205, 176; --accent-soft: #263d3b; --on-accent: #06261d;
    --teal: #69c9bd; --purple: #a99ae0; --coral: #e4917c;
    --code-bg: #172327; --code-head: #223238;
    --shadow: 0 18px 48px #0003;

    --bs-body-bg: var(--bg); --bs-body-bg-rgb: 23, 31, 37;
    --bs-body-color: var(--ink); --bs-body-color-rgb: 226, 235, 235;
    --bs-secondary-color: var(--muted); --bs-secondary-bg: var(--surface-2);
    --bs-tertiary-bg: var(--surface-2); --bs-border-color: var(--line);
    --bs-link-color: var(--accent); --bs-link-hover-color: var(--accent-strong);
    --bs-primary: var(--accent); --bs-primary-rgb: 88, 205, 176;
    --bs-success: var(--accent); --bs-success-rgb: 88, 205, 176;
}

html, body { background: var(--bg) !important; }
body { color: var(--ink); font-family: var(--font-ui); }
code, pre, kbd, samp, .font-monospace { font-family: var(--font-code) !important; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-ui); }

/* Retire the old decorative layers */
.auth-glow-bg { display: none !important; }
.text-gradient-primary { background: none !important; -webkit-text-fill-color: currentColor !important; color: var(--accent) !important; }
.text-success, .text-primary, .link-success { color: var(--accent) !important; }
.text-muted, .text-secondary, .text-body-secondary { color: var(--muted) !important; }

/* ---------- Layout helpers ---------- */
.page-wrap { max-width: 1160px; }
.muted { color: var(--muted); }
.eyebrow { font: 500 .67rem var(--font-code); letter-spacing: .13em; color: var(--teal); text-transform: uppercase; }
.surface, .glass-card, .card {
    background: var(--surface); color: var(--ink);
    border: 1px solid var(--line); border-radius: 15px;
    box-shadow: none; backdrop-filter: none; -webkit-backdrop-filter: none;
}
.glass-card { box-shadow: var(--shadow); }
.surface { box-shadow: var(--shadow); }
.soft-surface { background: var(--surface-2); border: 1px solid var(--line); border-radius: 15px; }
.pill {
    display: inline-flex; align-items: center; gap: 7px;
    border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line));
    background: var(--accent-soft); color: var(--accent-strong);
    border-radius: 999px; padding: 7px 11px; font-size: .75rem; font-weight: 700;
}
.tag { display: inline-block; background: var(--surface-2); border-radius: 6px; padding: 4px 7px; font: .61rem var(--font-code); color: var(--muted); }
.difficulty { font: .6rem var(--font-code); letter-spacing: .04em; text-transform: uppercase; color: var(--teal); white-space: nowrap; }
.track-link { color: var(--accent); font-size: .8rem; font-weight: 700; text-decoration: none; }
.track-link:hover { text-decoration: underline; color: var(--accent-strong); }
.track-icon { width: 39px; height: 39px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-size: 1.1rem; }
.section { padding: 56px 0; }
.section-title { font-weight: 700; letter-spacing: -.04em; }
.page-head { padding: 42px 0 25px; }
.page-head h1 { font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 700; letter-spacing: -.05em; }

/* ---------- Buttons ---------- */
.btn { border-radius: 9px; font-weight: 700; }
.btn-primary, .btn-brand-primary, .btn-nav-signup, .btn-auth-submit {
    --bs-btn-bg: var(--accent); --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent-strong); --bs-btn-hover-border-color: var(--accent-strong);
    --bs-btn-active-bg: var(--accent-strong); --bs-btn-active-border-color: var(--accent-strong);
    --bs-btn-color: var(--on-accent); --bs-btn-hover-color: var(--on-accent); --bs-btn-active-color: var(--on-accent);
    background: var(--accent) !important; background-image: none !important;
    border: 1px solid var(--accent) !important; color: var(--on-accent) !important;
    box-shadow: none !important; transform: none !important; animation: none !important;
}
.btn-primary:hover, .btn-brand-primary:hover, .btn-nav-signup:hover, .btn-auth-submit:hover {
    background: var(--accent-strong) !important; border-color: var(--accent-strong) !important; color: var(--on-accent) !important;
}
.btn-outline-brand, .btn-brand-secondary, .btn-outline-secondary, .btn-outline-success {
    background: var(--surface) !important; color: var(--ink) !important;
    border: 1px solid var(--line) !important; box-shadow: none !important; transform: none !important; animation: none !important;
}
.btn-outline-brand { border-radius: 9px; padding: .55rem .95rem; font-weight: 700; display: inline-flex; align-items: center; gap: .4rem; text-decoration: none; }
.btn-outline-brand:hover, .btn-brand-secondary:hover, .btn-outline-secondary:hover, .btn-outline-success:hover {
    border-color: var(--accent) !important; color: var(--accent) !important; background: var(--surface) !important;
}

/* ---------- Forms ---------- */
.form-control, .form-select, .form-control-minimal, .searchbox {
    background-color: var(--surface) !important; color: var(--ink) !important; border-color: var(--line) !important; border-radius: 9px;
}
.form-control:focus, .form-select:focus, .searchbox:focus {
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 .2rem color-mix(in srgb, var(--accent) 17%, transparent) !important;
}
.form-control::placeholder { color: var(--muted); opacity: 1; }
.form-label { font-weight: 700; font-size: .82rem; }
.dropdown-menu { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
.dropdown-item { color: var(--ink); border-radius: .5rem; }
.dropdown-item:hover, .dropdown-item:focus { background: var(--surface-2); color: var(--accent); }
.dropdown-header, .dropdown-divider { border-color: var(--line); }
.alert { border-radius: 12px; }
.page-link { color: var(--accent); background: var(--surface); border-color: var(--line); }
.page-item.disabled .page-link { background: var(--surface-2); color: var(--muted); border-color: var(--line); }
.progress { background: var(--surface-2); }
.progress-bar { background: var(--accent); }

/* ---------- Top bar ---------- */
.topbar {
    position: sticky; top: 0; z-index: 1030;
    background: color-mix(in srgb, var(--bg) 91%, transparent);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.topbar .brand { display: inline-flex; align-items: center; gap: .55rem; font-weight: 800; letter-spacing: -.03em; color: var(--ink) !important; text-decoration: none; }
.topbar .brand img { width: 40px; height: 40px; object-fit: contain; }
.topbar .nav-link { color: var(--muted); font-weight: 700; font-size: .88rem; padding: .5rem .65rem; }
.topbar .nav-link:hover, .topbar .nav-link.active { color: var(--accent); }
.topbar .navbar-toggler { border: 1px solid var(--line); color: var(--ink); padding: .3rem .55rem; }
.topbar .navbar-toggler:focus { box-shadow: none; }
.theme-toggle {
    width: 40px; height: 40px; border-radius: 11px; padding: 0;
    border: 1px solid var(--line) !important; background: var(--surface) !important; color: var(--ink) !important;
    display: inline-flex; align-items: center; justify-content: center;
}
.theme-toggle:hover { border-color: var(--accent) !important; color: var(--accent) !important; }
.nav-avatar { background: var(--accent) !important; background-image: none !important; color: var(--on-accent) !important; border: 0 !important; box-shadow: none !important; }
@media (max-width: 991.98px) {
    .topbar .navbar-collapse { padding: .5rem 0 1rem; }
    .topbar .navbar-nav { gap: .15rem; }
}

/* ---------- Footer ---------- */
.site-footer, .custom-footer { background: transparent !important; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; padding: 22px 0 !important; }
.site-footer a, .custom-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover, .custom-footer a:hover, .footer-link:hover, .footer-social-link-minimal:hover { color: var(--accent) !important; transform: none !important; }
.footer-link, .footer-social-link-minimal { color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: .35rem 1.1rem; }

/* ---------- Landing ---------- */
.hero { padding: 64px 0 48px; }
/* The headline is sized from its own column width (container query units), so the longest rotating
   phrase ("Computational Biology") always fits beside the code window at every breakpoint. */
.hero-copy { container-type: inline-size; min-width: 0; }
.hero h1 { font-size: clamp(1.9rem, 9.2cqi, 3.7rem); font-weight: 700; line-height: 1.06; letter-spacing: -.055em; max-width: 660px; }
.hero h1 .accent, .hero-word-rotator { color: var(--accent); }
.lead-copy { max-width: 550px; color: var(--muted); font-size: 1.05rem; line-height: 1.75; }
.code-window { overflow: hidden; border: 1px solid var(--line); background: var(--code-bg); border-radius: 15px; box-shadow: var(--shadow); color: #d9e9e4; }
.code-window-head, .code-window-foot {
    background: var(--code-head); padding: 10px 15px; color: #96aaa5; font: .68rem var(--font-code);
    display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.code-window-head { border-bottom: 1px solid #ffffff17; }
.code-window-foot { border-top: 1px solid #ffffff17; }
.code-window .hero-ide-stage { background: var(--code-bg) !important; color: #d9e9e4 !important; font-size: .8rem; }
.code-window .text-warning { color: var(--purple) !important; }
.code-window .text-info { color: var(--teal) !important; }
.code-window .text-success { color: #76e2b3 !important; }
.code-window .text-secondary { color: #78928b !important; }
.code-window .hero-ide-type-cursor { color: #76e2b3; }
.code-run {
    background: var(--accent); color: var(--on-accent) !important; border: 0; border-radius: 6px;
    padding: 5px 10px; font: 500 .65rem var(--font-code); text-decoration: none; box-shadow: none; animation: none;
    display: inline-flex; align-items: center; gap: .25rem;
}
.code-run:hover { background: var(--accent-strong); }
.statband { padding: 8px 0 24px; }
.statband-card {
    display: grid; grid-template-columns: repeat(4, 1fr);
    background: var(--surface); border: 1px solid var(--line); border-radius: 15px; overflow: hidden;
}
.stat-cell { padding: 22px 16px; text-align: center; border-left: 1px solid var(--line); }
.stat-cell:first-child { border-left: 0; }
.stat-cell strong { display: block; font-size: 1.15rem; letter-spacing: -.02em; }
.stat-cell small { display: block; margin-top: 2px; color: var(--muted); font-size: .75rem; }
@media (max-width: 767.98px) {
    .statband-card { grid-template-columns: repeat(2, 1fr); }
    .stat-cell:nth-child(3) { border-left: 0; }
    .stat-cell:nth-child(n+3) { border-top: 1px solid var(--line); }
}
.track-card, .feature-card, .problem-card {
    height: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
    transition: border-color .18s, box-shadow .18s;
}
.track-card:hover, .problem-card:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); box-shadow: var(--shadow); }
.track-card h3 { font-size: 1.06rem; font-weight: 700; margin: 12px 0 6px; }
.track-card p, .feature-card p { font-size: .84rem; line-height: 1.6; color: var(--muted); }
.track-line { border-top: 1px solid var(--line); padding: 11px 0; display: flex; align-items: center; gap: 9px; font-size: .8rem; color: var(--ink); text-decoration: none; }
.track-line:hover { color: var(--accent); }
.feature-card h3 { font-size: .98rem; font-weight: 700; margin: 10px 0 5px; }
.feature-icon { color: var(--accent); font: 500 1.1rem var(--font-code); }
.cta-panel { background: var(--surface-2); border: 1px solid var(--line); border-radius: 17px; padding: 28px; }
.hero-stat { opacity: 0; transform: translateY(10px); transition: opacity .5s ease, transform .5s ease; }
.hero-stat.is-visible { opacity: 1; transform: none; }
.category-explorer-panel { display: none; }
.category-explorer-panel.is-active { display: block; }

/* ---------- Problem bank ---------- */
.filter-chip {
    display: inline-flex; align-items: center; gap: .4rem;
    border: 1px solid var(--line); border-radius: 99px; padding: 7px 12px; background: var(--surface);
    font-size: .78rem; color: var(--muted); font-weight: 700; text-decoration: none; cursor: pointer;
}
.filter-chip:hover { border-color: var(--accent); color: var(--accent); }
.filter-chip.active { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-strong); }
.problem-card h3 a { color: var(--ink); text-decoration: none; }
.problem-card h3 a:hover { color: var(--accent); }

/* ---------- Leaderboard ---------- */
.ranking { display: grid; grid-template-columns: 54px 1fr auto; gap: 12px; align-items: center; padding: 14px 16px; border-top: 1px solid var(--line); }
.ranking.me { background: var(--accent-soft); }
.rank-number { font: 500 .95rem var(--font-code); color: var(--teal); }
.avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-strong); display: inline-grid; place-items: center; font-weight: 700; flex-shrink: 0; }
.avatar.user-avatar-badge { background: var(--accent-soft) !important; color: var(--accent-strong) !important; }
@media (max-width: 575.98px) { .ranking { grid-template-columns: 38px 1fr auto; padding-inline: 10px; } }

/* ---------- Legal / long-form ---------- */
.prose { max-width: 800px; color: var(--muted); line-height: 1.8; }
.prose h2, .prose h3 { color: var(--ink); margin-top: 2rem; font-weight: 700; }

/* ---------- Auth ---------- */
.auth-card { border-radius: 15px !important; box-shadow: var(--shadow) !important; background: var(--surface) !important; border: 1px solid var(--line) !important; }
.auth-toggle-container { background: var(--surface-2) !important; border-color: var(--line) !important; }
.auth-toggle-slider { background: var(--accent) !important; background-image: none !important; box-shadow: none !important; }
.auth-toggle-btn.active { color: var(--on-accent) !important; }

/* ---------- Misc legacy surfaces ---------- */
.table { --bs-table-bg: transparent; --bs-table-color: var(--ink); --bs-table-border-color: var(--line); --bs-table-hover-bg: color-mix(in srgb, var(--accent) 7%, transparent); }
.table-dark { --bs-table-bg: var(--surface-2); --bs-table-color: var(--muted); --bs-table-border-color: var(--line); }
.list-group-item { background: transparent; color: var(--ink); border-color: var(--line); }
.modal-content, .offcanvas { background: var(--surface); color: var(--ink); border-color: var(--line); }
.sticky-search-header { background: transparent !important; border: 0 !important; box-shadow: none !important; backdrop-filter: none !important; padding: 0 !important; }
.nav-tabs .nav-link.active, .nav-pills .nav-link.active { background: var(--accent) !important; color: var(--on-accent) !important; }

@media (max-width: 767.98px) {
    .hero { padding: 36px 0 28px; }
    .section { padding: 40px 0; }
}
.diff-line { font-family: var(--font-code); }

/* ---------- Problem workspace (problem_detail.html) ----------
   One contained, rounded card, centred with margins, instead of an edge-to-edge split screen.
   `body` prefix beats the page's own inline <style>, which loads after this file. */
body .ide-container {
    width: calc(100% - .75rem); max-width: 1640px;
    margin: 1rem auto 1.25rem;
    background: var(--surface); border: 1px solid var(--line); border-radius: 15px;
    overflow: hidden; box-shadow: var(--shadow);
}
@media (min-width: 992px) {
    body .ide-container { height: calc(100vh - 132px); min-height: 560px; width: calc(100% - 1.5rem); }
}
body .problem-sidebar { background: var(--surface) !important; border-color: var(--line) !important; box-shadow: none !important; padding: 1.5rem 1.75rem 2rem; }
@media (max-width: 991.98px) { body .problem-sidebar { padding: 1.25rem; } }
.ide-resizer { background: var(--line); }
.ide-resizer:hover, .ide-resizer.is-resizing { background: var(--accent); }
body .editor-area { background: var(--code-bg); }
body .editor-toolbar { background: var(--surface-2) !important; border-color: var(--line) !important; padding: .6rem .75rem !important; }
.editor-toolbar .btn { font-size: .8rem; }
.editor-toolbar .btn-success { background: var(--accent) !important; border-color: var(--accent) !important; color: var(--on-accent) !important; }
.editor-toolbar .btn-outline-danger { background: var(--surface) !important; color: var(--coral) !important; border-color: var(--line) !important; }
body .console-area, body .custom-input-area {
    background: var(--code-bg) !important; color: #76e2b3 !important; box-shadow: none !important;
    font-family: var(--font-code); font-size: .85rem;
}
body .console-section .nav-tabs { background: var(--surface-2) !important; border-color: var(--line) !important; }

/* Left panel typography and structure */
.problem-sidebar h3 { font-size: 1.5rem; letter-spacing: -.03em; }
.problem-sidebar h5 { font-size: 1.05rem; font-weight: 700; margin: 1.75rem 0 .6rem; }
.problem-sidebar h6 { font: 500 .7rem var(--font-code); letter-spacing: .1em; text-transform: uppercase; color: var(--teal); margin-top: 1.4rem; }
.problem-sidebar p, .problem-sidebar li { line-height: 1.7; }
.problem-sidebar .breadcrumb { --bs-breadcrumb-divider-color: var(--muted); }
.problem-sidebar .alert-info { background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); color: var(--ink); border-radius: 12px; font-size: .92rem; }
.problem-sidebar .alert-info strong { color: var(--accent-strong); }
.problem-sidebar .badge.bg-info, .problem-sidebar .badge.bg-secondary, .problem-sidebar a.badge {
    background: var(--surface-2) !important; color: var(--muted) !important; font: 500 .65rem var(--font-code); border: 1px solid var(--line);
}
.problem-sidebar .card { background: var(--surface-2) !important; border: 1px solid var(--line); border-radius: 12px; }
.problem-sidebar pre { background: var(--code-bg); color: #d9e9e4; border-radius: 8px; padding: .6rem .75rem; border: 0; }
.problem-sidebar pre code { color: inherit !important; }
.problem-sidebar code { color: var(--purple); }
.problem-sidebar table { --bs-table-bg: transparent; }

/* Problem / Notes switch */
.pane-tabs { display: inline-flex; gap: 4px; padding: 4px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 11px; margin-bottom: 1.25rem; position: sticky; top: -1rem; z-index: 3; }
.pane-tab { border: 0; background: transparent; color: var(--muted); font-weight: 700; font-size: .82rem; padding: .4rem .9rem; border-radius: 8px; display: inline-flex; align-items: center; gap: .4rem; }
.pane-tab:hover { color: var(--ink); }
.pane-tab.active { background: var(--surface); color: var(--accent); box-shadow: 0 1px 3px #0000001a; }
.problem-pane[hidden] { display: none; }

/* Copy buttons on sample cases */
.copy-holder { position: relative; }
.copy-btn { position: absolute; top: 22px; right: 6px; width: 26px; height: 26px; border: 0; border-radius: 6px; background: #ffffff1a; color: #d9e9e4; opacity: 0; transition: opacity .15s; display: grid; place-items: center; font-size: .8rem; }
.copy-holder:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
@media (hover: none) { .copy-btn { opacity: .8; } }

/* Zen mode: hide the new topbar/footer too, and let the workspace fill the screen */
body.zen-active .topbar, body.zen-active .site-footer { display: none !important; }
body.zen-active .ide-container { width: 100%; max-width: none; margin: 0; border: 0; border-radius: 0; box-shadow: none; height: 100vh !important; }
.problem-desc { line-height: 1.6; }

/* ---------- Problem list: card grid / table, one markup, CSS re-layout ---------- */
.problem-card {
    display: grid; align-content: start; gap: .5rem .75rem; padding: 17px;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto 1fr auto;
    grid-template-areas: "meta tags" "main main" "action action";
}
.pc-meta { grid-area: meta; display: inline-flex; align-items: center; gap: .5rem; }
.pc-tags { grid-area: tags; display: inline-flex; flex-wrap: wrap; justify-content: flex-end; gap: .25rem; }
.pc-main { grid-area: main; min-width: 0; }
.pc-main h3 { margin: .35rem 0 .4rem; }
.pc-action { grid-area: action; text-align: right; padding-top: .25rem; }
.problem-table-head { display: none; }

.view-switch { display: inline-flex; gap: 4px; padding: 4px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 11px; }
.view-btn { border: 0; background: transparent; color: var(--muted); font-weight: 700; font-size: .8rem; padding: .35rem .8rem; border-radius: 8px; display: inline-flex; align-items: center; gap: .4rem; }
.view-btn:hover { color: var(--ink); }
.view-btn.active { background: var(--surface); color: var(--accent); box-shadow: 0 1px 3px #0000001a; }

/* Table view */
.problem-list.view-table { --bs-gutter-x: 0; --bs-gutter-y: 0; margin: 0; display: block; background: var(--surface); border: 1px solid var(--line); border-radius: 15px; overflow: hidden; }
.view-table > * { width: 100%; max-width: 100%; padding: 0; margin: 0; }
.view-table .problem-table-head,
.view-table .problem-card {
    display: grid; align-items: center; column-gap: 1rem;
    grid-template-columns: 32px minmax(0, 1fr) 130px minmax(0, 230px) 84px;
    grid-template-rows: auto; grid-template-areas: "status main difficulty tags action";
}
.view-table .problem-table-head { padding: .65rem 1rem; background: var(--surface-2); border-bottom: 1px solid var(--line); font: 500 .66rem var(--font-code); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.view-table .problem-card { height: auto; padding: .8rem 1rem; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; box-shadow: none; }
.view-table > [data-search]:last-of-type .problem-card { border-bottom: 0; }
.view-table .problem-card:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); box-shadow: none; }
.view-table .pc-meta { display: contents; }
.view-table .pc-status { grid-area: status; }
.view-table .pc-difficulty { grid-area: difficulty; }
.view-table .pc-tags { justify-content: flex-start; flex-wrap: nowrap; overflow: hidden; }
.view-table .pc-main h3 { font-size: 1rem; margin: 0; }
.view-table .problem-desc { display: none; }
.view-table .pc-action { padding: 0; }
.view-table .surface { box-shadow: none; border: 0; }
@media (max-width: 767.98px) {
    .view-table .problem-table-head { display: none; }
    .view-table .problem-card {
        grid-template-columns: auto minmax(0, 1fr) auto; row-gap: .4rem;
        grid-template-areas: "status difficulty action" "main main main" "tags tags tags";
    }
    .view-table .pc-tags { flex-wrap: wrap; }
}

/* Pagination */
.pagination { --bs-pagination-border-radius: 9px; gap: 4px; }
.pagination .page-link { border-radius: 9px; min-width: 38px; text-align: center; font-weight: 700; font-size: .85rem; }
.pagination .page-link:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-strong); }
.pagination .page-item.active .page-link { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* Pages with the wide problem workspace: make the navbar and footer span the same width as the
   workspace card (same max-width and side gutters as `body .ide-container`) so the edges line up. */
body:has(.ide-container) .topbar .page-wrap,
body:has(.ide-container) .site-footer .page-wrap {
    max-width: 1640px; width: calc(100% - .75rem);
    padding-inline: 1rem;
}
@media (min-width: 992px) {
    body:has(.ide-container) .topbar .page-wrap,
    body:has(.ide-container) .site-footer .page-wrap { width: calc(100% - 1.5rem); }
}

/* Bootstrap's .navbar resets horizontal padding to 0, which cancels the .container gutter, so the
   brand and buttons touched the screen edges on phones/tablets. Restore a small side margin. */
@media (max-width: 1199.98px) {
    .topbar .navbar { padding-inline: 1rem; }
}
@media (max-width: 575.98px) {
    .topbar .navbar { padding-inline: .85rem; }
}

/* ---------- Landing: "From the Central Dogma to CtrlDogma" ---------- */
.dogma-section { background: var(--surface); border: 1px solid var(--line); border-radius: 17px; padding: 2rem; }
.dogma-img { max-height: 150px; width: auto; object-fit: contain; }
[data-bs-theme="dark"] .dogma-img { filter: invert(1) hue-rotate(180deg); opacity: .85; }
.dogma-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: .75rem; align-items: stretch; margin-bottom: 1rem; }
.dogma-stage { background: var(--surface-2); border: 1px solid var(--line); border-radius: 14px; padding: 1.25rem; }
.dogma-badge { display: inline-block; font: 500 .7rem var(--font-code); letter-spacing: .14em; text-transform: uppercase; background: var(--accent); color: var(--on-accent); border-radius: 6px; padding: .25rem .6rem; }
.dogma-stage h3 { font-size: 1.05rem; font-weight: 700; margin: .85rem 0 .3rem; }
.dogma-stage p { font-size: .84rem; color: var(--muted); margin-bottom: .6rem; line-height: 1.55; }
.dogma-stage ul { list-style: none; padding: 0; margin: 0; font-size: .84rem; }
.dogma-stage li { padding: .35rem 0; border-top: 1px solid var(--line); display: flex; gap: .5rem; align-items: baseline; }
.dogma-stage li::before { content: "✓"; color: var(--accent); font-weight: 700; }
.dogma-arrow { align-self: center; color: var(--accent); font-size: 1.6rem; font-weight: 700; }
.dogma-outcome { display: flex; gap: .85rem; align-items: flex-start; height: 100%; padding: 1rem 1.1rem; border: 1px dashed var(--line); border-radius: 12px; }
.dogma-outcome i { font-size: 1.3rem; color: var(--accent); line-height: 1.2; }
.dogma-outcome strong { display: block; font-size: .92rem; }
.dogma-outcome span { display: block; font-size: .8rem; color: var(--muted); line-height: 1.5; }
@media (max-width: 767.98px) {
    .dogma-section { padding: 1.25rem; }
    .dogma-flow { grid-template-columns: 1fr; gap: .4rem; }
    .dogma-arrow { transform: rotate(90deg); justify-self: center; line-height: 1; }
}

/* ======================================================================
   Round-3 additions: difficulty colours, progress, start-here, search badge,
   verdict pills, mobile editor bar, back-to-top, profile tabs
   ====================================================================== */

/* ---------- Colour-coded difficulty (quiet tinted chips, not bright badges) ---------- */
:root, [data-bs-theme="light"] { --d-foundational: #128665; --d-intermediate: #9a6200; --d-advanced: #c24433; }
[data-bs-theme="dark"] { --d-foundational: #58cdb0; --d-intermediate: #e8c27a; --d-advanced: #f29a8a; }
.difficulty { display: inline-block; padding: .2rem .5rem; border-radius: 6px; text-decoration: none; transition: background .15s, box-shadow .15s; }
.difficulty[class*="diff-"] { color: var(--d, var(--teal)); background: color-mix(in srgb, var(--d, var(--teal)) 12%, transparent); }
.diff-foundational { --d: var(--d-foundational); }
.diff-intermediate { --d: var(--d-intermediate); }
.diff-advanced { --d: var(--d-advanced); }
a.difficulty:hover { background: color-mix(in srgb, var(--d, var(--teal)) 24%, transparent); box-shadow: 0 0 0 1px color-mix(in srgb, var(--d, var(--teal)) 45%, transparent); color: var(--d, var(--teal)); }

/* ---------- Progress, continue, start-here (problem bank) ---------- */
.progress { height: .5rem; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.progress-lg { height: .8rem; }
.progress-bar { background: var(--accent) !important; border-radius: 99px; transition: width .6s ease; }
.track-mini { display: block; color: var(--ink); padding: .5rem .6rem; border-radius: 10px; border: 1px solid transparent; }
.track-mini:hover { border-color: var(--line); background: var(--surface-2); color: var(--ink); }
.track-mini .progress { height: .4rem; }
.continue-card { border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.starter-link { display: flex; align-items: center; gap: .6rem; padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color .15s; }
.starter-link:hover { border-color: var(--accent); color: var(--ink); }

/* ---------- "/" shortcut badge inside the search box ---------- */
.search-kbd { position: absolute; right: .75rem; top: 50%; transform: translateY(-50%); pointer-events: none; font: 500 .7rem var(--font-code); color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: .05rem .4rem; }
.searchbox:focus + .search-kbd, .searchbox:not(:placeholder-shown) + .search-kbd { display: none; }
@media (hover: none) { .search-kbd { display: none; } }

/* ---------- Run / Submit verdict pills (console is a dark surface in both themes) ---------- */
.verdict-pill { display: inline-flex; align-items: center; gap: .45rem; padding: .3rem .8rem; border-radius: 99px; font-weight: 700; font-size: .85rem; border: 1px solid transparent; }
.verdict-pass { color: #76e2b3; background: #76e2b31f; border-color: #76e2b340; }
.verdict-fail { color: #ff9a8a; background: #ff9a8a1f; border-color: #ff9a8a40; }
.verdict-warn { color: #f2c879; background: #f2c8791f; border-color: #f2c87940; }

/* ---------- Problem page extras ---------- */
.key-hints kbd { background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: .02rem .35rem; font: 500 .68rem var(--font-code); }
.back-to-top { position: sticky; bottom: 1rem; margin: 1rem 0 0 auto; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); color: var(--accent); box-shadow: var(--shadow); z-index: 4; }
.back-to-top[hidden] { display: none; }
.back-to-top:hover { border-color: var(--accent); }
.editor-toolbar .dropdown { flex: 0 0 auto !important; }

/* Phones: Run / Submit become a bar fixed to the bottom of the screen, always one thumb away */
@media (max-width: 767.98px) {
    body .editor-toolbar > div:last-child {
        position: fixed; left: 0; right: 0; bottom: 0; z-index: 1040;
        display: flex; gap: .5rem; padding: .6rem .75rem !important;
        background: var(--surface); border-top: 1px solid var(--line) !important;
        box-shadow: 0 -6px 20px #0000001f;
    }
    body .editor-toolbar > div:last-child .btn { flex: 1; padding: .55rem .75rem; font-size: .9rem; margin: 0 !important; }
    body:has(.ide-container) { padding-bottom: 66px; }
    body.zen-active:has(.ide-container) { padding-bottom: 66px; }
}

/* ---------- Profile page ---------- */
.card.bg-body-tertiary { background: var(--surface) !important; }
.bg-gradient { background-image: none !important; }
.user-avatar-badge.bg-primary { background: var(--accent-soft) !important; color: var(--accent-strong) !important; }
#profileTabs {
    display: flex; flex-wrap: nowrap; gap: 4px; padding: 4px; overflow-x: auto; scrollbar-width: none;
    width: fit-content; max-width: 100%;
    background: var(--surface-2); border: 1px solid var(--line) !important; border-radius: 12px;
}
#profileTabs::-webkit-scrollbar { display: none; }
#profileTabs .nav-link { border: 0 !important; border-radius: 9px; color: var(--muted); font-weight: 700; font-size: .85rem; white-space: nowrap; padding: .5rem .9rem; }
#profileTabs .nav-link:hover { color: var(--ink); }
#profileTabs .nav-link.active { background: var(--surface) !important; color: var(--accent) !important; box-shadow: 0 1px 3px #0000001a; }

/* Progress card: track-by-track bars sit behind a chevron toggle in the top-right corner */
.progress-toggle { width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); display: inline-grid; place-items: center; padding: 0; }
.progress-toggle:hover { border-color: var(--accent); color: var(--accent); }
.progress-toggle i { transition: transform .2s ease; }
.progress-toggle:not(.collapsed) i { transform: rotate(180deg); }

/* Site name beside the logo uses the same accent as the headline highlight and every other green */
.topbar .brand, .topbar .brand span { color: var(--accent) !important; }

/* ======================================================================
   Labs (guided projects)
   ====================================================================== */
.lab-card { height: 100%; display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; transition: border-color .18s, box-shadow .18s; }
.lab-card:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); box-shadow: var(--shadow); }
.lab-card.is-completed { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.lab-card-link { color: var(--ink); text-decoration: none; }
.lab-card-link:hover { color: var(--accent); }
.lab-card-foot { margin-top: auto; padding-top: .85rem; border-top: 1px solid var(--line); display: flex; align-items: center; gap: .75rem; }
.lab-badge { display: inline-flex; align-items: center; font: 500 .66rem var(--font-code); letter-spacing: .08em; text-transform: uppercase; padding: .25rem .6rem; border-radius: 99px; border: 1px solid var(--line); }
.lab-badge-free { color: var(--accent-strong); background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, var(--line)); }
.lab-badge-pro { color: var(--d-intermediate); background: color-mix(in srgb, var(--d-intermediate) 12%, transparent); border-color: color-mix(in srgb, var(--d-intermediate) 35%, var(--line)); }
.lab-status { font-size: .8rem; font-weight: 700; color: var(--muted); }
.lab-status-done { color: var(--accent); }
.lab-status-progress { color: var(--d-intermediate); }

/* Step timeline */
.lab-steps { list-style: none; margin: 0; padding: 0; }
.lab-step { position: relative; display: flex; gap: 1rem; padding-bottom: 1.1rem; }
.lab-step:not(:last-child)::before { content: ""; position: absolute; left: 17px; top: 38px; bottom: -2px; width: 2px; background: var(--line); }
.lab-step-num { flex: 0 0 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); border: 2px solid var(--line); color: var(--muted); font: 700 .85rem var(--font-code); z-index: 1; }
.lab-step.is-current .lab-step-num { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.lab-step.is-done .lab-step-num { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.lab-step-body { flex: 1; min-width: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.15rem; }
.lab-step.is-current .lab-step-body { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.lab-step.is-locked .lab-step-body { background: var(--surface-2); }

/* Sidebar, facts, checklists, prose */
@media (min-width: 992px) { .lab-aside { position: sticky; top: 5.5rem; } }
.lab-checklist { list-style: none; padding: 0; }
.lab-checklist li { display: flex; gap: .6rem; padding: .3rem 0; line-height: 1.55; }
.lab-checklist li::before { content: "✓"; color: var(--accent); font-weight: 700; }
.lab-facts div { display: flex; justify-content: space-between; padding: .4rem 0; border-bottom: 1px solid var(--line); font-size: .88rem; }
.lab-facts div:last-child { border-bottom: 0; }
.lab-facts dt { color: var(--muted); font-weight: 500; }
.lab-facts dd { margin: 0; font-weight: 700; }
.lab-complete { display: flex; align-items: center; gap: .75rem; }
.lab-complete i { font-size: 2rem; color: var(--accent); }
.prose-lab { color: var(--muted); line-height: 1.75; }
.prose-lab p:last-child { margin-bottom: 0; }
.prose-lab strong { color: var(--ink); }
.prose-lab code { color: var(--purple); }

/* ---------- Labs: stage workspace (notebook, questions, explanation) ---------- */
.lab-how { padding-left: 1.2rem; color: var(--muted); line-height: 1.8; }
.lab-how strong { color: var(--ink); }
.lab-skills { list-style: none; padding: 0; }
.lab-skills li { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; padding: .4rem 0; border-top: 1px solid var(--line); font-size: .9rem; }
.lab-skills li:first-child { border-top: 0; }
.stage-chip { display: inline-flex; align-items: center; gap: .4rem; padding: .25rem .7rem; border-radius: 99px; font-size: .78rem; font-weight: 700; color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); }
.stage-chip.is-done { color: var(--accent-strong); background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.prose-brief h1, .prose-brief h2, .prose-brief h3 { color: var(--ink); font-size: 1rem; margin-top: 1.1rem; }
.lab-data { background: var(--code-bg); color: #d9e9e4; border-radius: 10px; padding: .75rem .9rem; font: .8rem/1.6 var(--font-code); white-space: pre-wrap; word-break: break-all; max-height: 220px; overflow: auto; margin: 0; }

.nb-panel { padding: 0; overflow: hidden; }
.nb-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .9rem; padding: .7rem 1rem; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.nb-status { flex: 1; min-width: 140px; font-size: .75rem; color: var(--muted); }
.nb-tools { display: inline-flex; gap: .35rem; }
.nb-tool { padding: .2rem .6rem; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: 500 .72rem var(--font-code); text-decoration: none; }
.nb-tool:hover { border-color: var(--accent); color: var(--accent); }
.nb-cell { border-bottom: 1px solid var(--line); }
.nb-cell-head { display: flex; align-items: center; gap: .6rem; padding: .45rem 1rem; background: color-mix(in srgb, var(--surface-2) 55%, transparent); }
.nb-in { font: 500 .72rem var(--font-code); color: var(--teal); min-width: 3.9rem; }
.nb-name { flex: 1; font-size: .75rem; color: var(--muted); }
.nb-cell.is-primary .nb-name { color: var(--accent-strong); font-weight: 700; }
.nb-run, .nb-del { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; padding: .15rem .6rem; font: 700 .75rem var(--font-ui); }
.nb-run:hover, .nb-del:hover { border-color: var(--accent); color: var(--accent); }
.nb-run:disabled { opacity: .6; }
.nb-code { display: block; width: 100%; min-height: 64px; resize: none; border: 0; outline: 0; padding: .8rem 1rem; background: var(--code-bg); color: #e3eeea; font: .82rem/1.6 var(--font-code); tab-size: 4; white-space: pre; overflow-x: auto; }
.nb-code:focus { box-shadow: inset 3px 0 0 var(--accent); }
.nb-out { padding: .6rem 1rem; background: var(--surface); border-top: 1px dashed var(--line); }
.nb-out pre { margin: 0; font: .8rem/1.55 var(--font-code); white-space: pre-wrap; word-break: break-word; color: var(--ink); }
.nb-out .nb-stderr, .nb-out .nb-error { color: #c24433; }
[data-bs-theme="dark"] .nb-out .nb-stderr, [data-bs-theme="dark"] .nb-out .nb-error { color: #f29a8a; }
.nb-out .nb-result { color: var(--teal); }
.nb-out .nb-muted { color: var(--muted); font-family: var(--font-ui); }
.nb-submit { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; padding: .8rem 1rem; }
.nb-result { margin: 0 1rem 1rem; padding: .8rem 1rem; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); font-size: .88rem; }
.nb-result.is-pass { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); background: var(--accent-soft); }
.nb-result.is-fail { border-color: color-mix(in srgb, #c24433 40%, var(--line)); background: color-mix(in srgb, #c24433 8%, var(--surface)); }
.nb-result-title { font-weight: 700; margin-bottom: .4rem; }
.nb-case { margin-top: .5rem; }
.nb-case-head { font-weight: 700; font-size: .82rem; }
.nb-diff { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin-top: .4rem; }
.nb-diff pre { margin: 0; background: var(--code-bg); color: #d9e9e4; padding: .5rem .7rem; border-radius: 8px; font: .76rem/1.5 var(--font-code); white-space: pre-wrap; word-break: break-word; max-height: 160px; overflow: auto; }
.nb-diff-label { font: 500 .66rem var(--font-code); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: .2rem; }
@media (max-width: 575.98px) { .nb-diff { grid-template-columns: 1fr; } }
.nb-hidden { margin-top: .6rem; display: flex; flex-wrap: wrap; align-items: center; gap: .3rem; }
.nb-pip { display: inline-grid; place-items: center; width: 1.4rem; height: 1.4rem; border-radius: 50%; font-size: .75rem; font-weight: 700; }
.nb-pip.is-pass { background: var(--accent); color: var(--on-accent); }
.nb-pip.is-fail { background: #c24433; color: #fff; }

.mcq { padding: .9rem 0; border-top: 1px solid var(--line); }
.mcq:first-of-type { border-top: 0; padding-top: 0; }
.mcq-prompt { font-weight: 600; margin-bottom: .5rem; }
.mcq-prompt .prose-lab { color: var(--ink); }
.mcq-prompt p { display: inline; margin: 0; }
.mcq-num { color: var(--teal); font-family: var(--font-code); margin-right: .25rem; }
.mcq-option { display: flex; align-items: flex-start; gap: .6rem; padding: .5rem .75rem; margin-bottom: .35rem; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); cursor: pointer; font-size: .9rem; }
.mcq-option:hover { border-color: var(--accent); }
.mcq-option input { margin-top: .25rem; accent-color: var(--accent); }
.mcq.is-correct .mcq-option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.mcq.is-wrong .mcq-option:has(input:checked) { border-color: #c24433; background: color-mix(in srgb, #c24433 8%, var(--surface)); }
.mcq-note { margin-top: .4rem; }
.mcq.is-correct .mcq-note { color: var(--accent-strong); }
.mcq.is-wrong .mcq-note { color: #c24433; }
.mcq-explain { color: var(--muted); }
.mcq-explain p { display: inline; margin: 0; }
#explCount.is-ok { color: var(--accent); font-weight: 700; }
.stage-done { display: flex; align-items: center; gap: .75rem; padding: .85rem 1rem; margin-bottom: .6rem; border-radius: 12px; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line)); }
.stage-done[hidden] { display: none; }
.stage-done > i { font-size: 1.5rem; color: var(--accent); }
.btn.disabled { pointer-events: none; opacity: .5; }

/* Labs: libraries note under the notebook toolbar */
.nb-libs { padding: .5rem 1rem; font-size: .76rem; color: var(--muted); background: color-mix(in srgb, var(--accent-soft) 50%, transparent); border-bottom: 1px solid var(--line); }
.nb-libs code { color: var(--accent-strong); }

/* ======================================================================
   Labs v2: catalogue cards, lab hero, stage stepper, numbered work steps,
   submission history, CodeMirror theme
   ====================================================================== */
.min-w-0 { min-width: 0; }

/* How a lab works strip on the catalogue */
.labs-intro { max-width: 640px; }
.labs-how { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .6rem; }
.labs-how li { display: flex; align-items: center; gap: .6rem; padding: .65rem .8rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); font-size: .82rem; color: var(--muted); }
.labs-how strong { color: var(--ink); }
.labs-how-num { flex: 0 0 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-strong); font: 700 .75rem var(--font-code); }
@media (max-width: 991.98px) { .labs-how { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 575.98px) { .labs-how { grid-template-columns: 1fr; } }

/* Catalogue card */
.lab-card { position: relative; overflow: hidden; padding: 24px 20px 18px; transition: transform .18s, box-shadow .18s, border-color .18s; }
.lab-card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--d, var(--accent)); }
.lab-card:hover { transform: translateY(-2px); }
.lab-card-top { display: flex; justify-content: space-between; align-items: flex-start; }
.lab-card-icon { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font-size: 1.4rem; color: var(--d, var(--accent)); background: color-mix(in srgb, var(--d, var(--accent)) 14%, transparent); }
.lab-card-summary { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.lab-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem .9rem; font-size: .78rem; color: var(--muted); }
.lab-meta i { color: var(--teal); }
.lab-card-cta { font-weight: 700; font-size: .85rem; color: var(--accent); white-space: nowrap; }
.lab-card-cta i { display: inline-block; transition: transform .15s; }
.lab-card:hover .lab-card-cta i { transform: translateX(3px); }
.lab-card.is-locked .lab-card-icon { filter: grayscale(.4); }
.stage-dots { display: flex; gap: 4px; max-width: 180px; }
.stage-dots span { flex: 1; height: 6px; border-radius: 99px; background: var(--surface-2); border: 1px solid var(--line); }
.stage-dots span.is-done { background: var(--accent); border-color: var(--accent); }

/* Lab overview hero */
.lab-hero { padding: 1.4rem 0 1.8rem; }
.lab-hero-main { display: flex; gap: 1.1rem; align-items: flex-start; }
.lab-hero-icon { flex: 0 0 64px; height: 64px; border-radius: 18px; display: grid; place-items: center; font-size: 1.8rem; color: var(--d, var(--accent)); background: color-mix(in srgb, var(--d, var(--accent)) 14%, transparent); border: 1px solid color-mix(in srgb, var(--d, var(--accent)) 30%, var(--line)); }
.lab-hero h1 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); font-weight: 700; letter-spacing: -.04em; }
.lab-hero-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1.4rem; margin-top: 1.1rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: .85rem; color: var(--muted); }
.lab-hero-meta i { color: var(--teal); margin-right: .2rem; }
@media (max-width: 575.98px) { .lab-hero-icon { flex-basis: 48px; height: 48px; font-size: 1.35rem; border-radius: 14px; } }

/* Stage header and stepper */
.stage-header { padding: .5rem 0 1.4rem; }
.stage-header-top { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: .9rem; }
.stage-lab-icon { flex: 0 0 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.stage-lab-name { font-weight: 700; font-size: .92rem; }
.stage-stepper { list-style: none; padding: 0 0 .2rem; margin: 0; display: flex; gap: .4rem; overflow-x: auto; scrollbar-width: thin; }
.stage-stepper li { flex: 1 1 0; min-width: 120px; }
.stage-stepper a { display: flex; align-items: center; gap: .5rem; height: 100%; padding: .45rem .6rem; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--muted); text-decoration: none; font-size: .78rem; }
.stage-stepper a:hover { border-color: var(--accent); color: var(--ink); }
.stepper-dot { flex: 0 0 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); border: 1.5px solid var(--line); font: 700 .72rem var(--font-code); color: var(--muted); }
.stepper-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.stage-stepper li.is-done .stepper-dot { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.stage-stepper li.is-here a { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); font-weight: 700; }
.stage-stepper li.is-here .stepper-dot { border-color: var(--accent); color: var(--accent); }
.stage-stepper li.is-here.is-done .stepper-dot { color: var(--on-accent); }
@media (max-width: 767.98px) { .stepper-label { display: none; } .stage-stepper li { flex: 0 0 auto; min-width: 0; } }

.guest-note { display: flex; gap: .75rem; align-items: flex-start; padding: .8rem 1rem; margin-bottom: 1rem; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); font-size: .88rem; }
.guest-note > i { color: var(--accent); font-size: 1.2rem; line-height: 1.2; }
@media (min-width: 992px) { .stage-aside { position: sticky; top: 5.5rem; } }

/* Numbered work steps: 1 Code, 2 Questions, 3 Explain */
.work-step-head { display: flex; align-items: center; gap: .75rem; }
.nb-panel .work-step-head { padding: .75rem 1rem; background: var(--surface-2); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.work-step-num { flex: 0 0 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); border: 1.5px solid var(--line); font: 700 .8rem var(--font-code); color: var(--muted); }
.nb-panel .work-step-num { background: var(--surface); }
.work-step-num i { display: none; }
.work-step.is-done { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.work-step.is-done .work-step-num { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.work-step.is-done .work-step-num .n { display: none; }
.work-step.is-done .work-step-num i { display: inline; }
.nb-panel .nb-status { font-size: .74rem; }

.nb-hint { padding: .55rem 1rem 0; }
.nb-hint kbd { background: var(--surface-2); color: var(--ink); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 .3rem; font-size: .7rem; }
.nb-cell.is-running .nb-in { color: var(--accent); }
.nb-history { margin: 0 1rem 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.nb-history[hidden] { display: none; }
.nb-history summary { cursor: pointer; padding: .6rem .9rem; font-weight: 700; font-size: .85rem; }
.nb-history-list { list-style: none; margin: 0; padding: 0 .9rem .6rem; }
.nb-history-list li { display: flex; align-items: center; gap: .6rem; padding: .45rem 0; border-top: 1px solid var(--line); font-size: .85rem; }
.stage-nav { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }

/* CodeMirror themed to the dark code panel used in both themes */
.nb-cell .CodeMirror { height: auto; min-height: 64px; background: var(--code-bg); color: #e3eeea; font: .82rem/1.6 var(--font-code); padding: .35rem 0; }
.nb-cell .CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid #ffffff14; }
.nb-cell .CodeMirror-linenumber { color: #6f8580; }
.nb-cell .CodeMirror-cursor { border-left: 2px solid #58cdb0; }
.nb-cell .CodeMirror-selected, .nb-cell .CodeMirror-focused .CodeMirror-selected { background: #58cdb033; }
.nb-cell .CodeMirror-focused { box-shadow: inset 3px 0 0 var(--accent); }
.nb-cell .cm-keyword { color: #b9a4f0; }
.nb-cell .cm-def { color: #7fcbdc; }
.nb-cell .cm-variable-2, .nb-cell .cm-builtin { color: #8fd3c4; }
.nb-cell .cm-string { color: #e8c98a; }
.nb-cell .cm-number { color: #f2a07b; }
.nb-cell .cm-comment { color: #78928b; font-style: italic; }
.nb-cell .cm-operator { color: #c9d6d2; }
.nb-cell .cm-property { color: #a8d8ff; }
.nb-cell .CodeMirror-matchingbracket { color: #76e2b3 !important; text-decoration: underline; }

/* Labs v3: submissions-only model (questions are a browser self-check) */
.stage-chip-local { border-style: dashed; }
.stage-chip-local.is-done { border-style: solid; }
.submit-rule { display: flex; gap: .55rem; align-items: flex-start; margin-top: .9rem; padding: .65rem .8rem; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line); color: var(--muted); line-height: 1.55; }
.submit-rule > i { color: var(--accent); margin-top: .1rem; }
.submit-rule strong { color: var(--ink); }
#explCount { color: var(--muted); }
#explCount.is-ok { color: var(--accent); font-weight: 700; }

/* ---- Analytics consent banner (base.html) ---- */
.consent-banner { position: fixed; z-index: 1080; left: 16px; right: 16px; bottom: 16px; max-width: 640px; margin: 0 auto; display: flex; align-items: center; gap: 1rem; padding: .9rem 1rem; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); font-size: .86rem; line-height: 1.5; }
.consent-banner[hidden] { display: none; }
.consent-banner a { color: var(--accent); }
.consent-actions { display: flex; gap: .5rem; flex-shrink: 0; }
@media (max-width: 575.98px) {
    .consent-banner { flex-direction: column; align-items: stretch; }
    .consent-actions { justify-content: flex-end; }
}