/* Theme tokens: WCAG AA checked pairs. Loaded AFTER variables.css so it wins. Dark is default. */
:root, :root[data-theme="dark"] {
  color-scheme: dark;
  --bg-void:#09090b; --bg-base:#09090b; --bg-panel:#18181b; --bg-panel-raised:#212126; --bg-inset:#0f0f12; --bg-overlay:rgba(9,9,11,.82);
  --border-subtle:#27272a; --border-default:#34343a; --border-strong:#52525b;
  --text-primary:#fafafa; --text-secondary:#d4d4d8; --text-muted:#a1a1aa; --text-disabled:#71717a;
  --signal-up:#34d399; --signal-down:#f87171; --signal-warn:#fbbf24; --signal-info:#60a5fa;
  --accent-sql:#34d399; --accent-git:#fb923c; --accent-linux:#fbbf24; --accent-ccna:#60a5fa; --accent-primary:#818cf8; --accent-primary-dim:#2a2a5c;
  --font-body:'Inter','Plus Jakarta Sans','Segoe UI',system-ui,sans-serif; --font-display:var(--font-body); --font-mono:'JetBrains Mono','Fira Code','Cascadia Code',Consolas,monospace;
  --amber:#f59e0b; --amber-text:#f59e0b; --indigo:#6366f1;
  --on-accent:#0a0d12; --accent-primary-hover:#a5b4fc; --overlay-soft:rgba(24,24,27,.82); --bg-elevated:#212126;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg-void:#f1f5f9; --bg-base:#f8fafc; --bg-panel:#ffffff; --bg-panel-raised:#f1f5f9; --bg-inset:#f1f5f9; --bg-overlay:rgba(248,250,252,.86);
  --border-subtle:#e2e8f0; --border-default:#cbd5e1; --border-strong:#94a3b8;
  --text-primary:#0f172a; --text-secondary:#334155; --text-muted:#475569; --text-disabled:#64748b;
  --signal-up:#047857; --signal-down:#b91c1c; --signal-warn:#b45309; --signal-info:#0369a1;
  --accent-sql:#047857; --accent-git:#c2410c; --accent-linux:#a16207; --accent-ccna:#0369a1; --accent-primary:#4f46e5; --accent-primary-dim:#e0e7ff;
  --amber-text:#b45309; --on-accent:#ffffff; --accent-primary-hover:#4338ca; --overlay-soft:rgba(255,255,255,.86); --bg-elevated:#e2e8f0;
  --signal-up-dim:#d1fae5; --signal-down-dim:#fee2e2; --signal-warn-dim:#fef3c7; --signal-info-dim:#e0f2fe;
  --shadow-panel:0 1px 2px rgba(15,23,42,.08),0 4px 16px rgba(15,23,42,.06); --shadow-raised:0 8px 28px rgba(15,23,42,.16);
  --shadow-glow-up:0 0 0 1px rgba(4,120,87,.35); --shadow-glow-down:0 0 0 1px rgba(185,28,28,.35);
}
/* The terminal stays dark in BOTH themes (like every real terminal), so its colors never depend on the page theme. */
.terminal,.terminal *{color-scheme:dark}
.terminal{--bg-inset:#0b0b0e;--bg-panel:#121216;--border-default:#34343a;--border-subtle:#27272a;--text-primary:#fafafa;--text-secondary:#d4d4d8;--text-muted:#a1a1aa;--text-disabled:#71717a;--signal-up:#34d399;--signal-down:#f87171;--signal-warn:#fbbf24;--signal-info:#60a5fa;--accent-linux:#fbbf24;--accent-git:#fb923c;--accent-ccna:#60a5fa;--accent-sql:#34d399;--accent-primary:#818cf8}
.lucide{display:inline-flex;align-items:center;justify-content:center;line-height:0;vertical-align:-.2em;flex:none}.lucide svg{display:block}
.empty-icon{display:grid;place-items:center;color:var(--text-muted);margin-bottom:var(--sp-2)}
.lab-step::before{content:'';display:inline-block;width:15px;height:15px;margin-right:8px;vertical-align:-3px;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3C/svg%3E") center/contain no-repeat}
.lab-step.done::before{-webkit-mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E")}
.theme-toggle,.nav-burger{background:var(--bg-panel);color:var(--text-primary);border:1px solid var(--border-default);border-radius:8px;padding:6px 10px;cursor:pointer;font:inherit}
.theme-toggle:hover,.nav-burger:hover{border-color:var(--accent-primary)}
.theme-toggle:focus-visible,.nav-burger:focus-visible,.tier-chip:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}
.sector-pill{font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--amber);border:1px solid var(--amber);border-radius:999px;padding:2px 8px;margin-left:8px}
/* Rendered markdown in lesson copy */
.md{line-height:1.65}.md p{margin:0 0 .8em}.md strong{color:var(--text-primary)}.md h3,.md h4{color:var(--text-primary);margin:1em 0 .4em}
.md code{font-family:var(--font-mono);background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:4px;padding:1px 5px;font-size:.92em;color:var(--text-primary)}
.md pre{background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:8px;padding:12px;overflow-x:auto}.md pre code{border:0;padding:0}
.md ul,.md ol{padding-left:1.3em;margin:0 0 .8em}
/* Tier stepper (replaces cut-off pills) */
.tier-nav{display:grid;gap:10px;margin-bottom:var(--sp-4)}
.tier-group{background:var(--bg-panel);border:1px solid var(--border-subtle);border-radius:12px;padding:10px 12px}
.tier-group.current{border-color:var(--accent-primary)}
.tier-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}.tier-title{font-weight:700;color:var(--text-primary)}.tier-count{font-size:12px;color:var(--text-muted)}
.tier-bar{flex:1;height:4px;background:var(--bg-inset);border-radius:2px;overflow:hidden;max-width:160px}.tier-bar i{display:block;height:100%;background:var(--signal-up)}
.tier-chips{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
.tier-chip{flex:0 0 auto;max-width:240px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;background:var(--bg-inset);color:var(--text-secondary);border:1px solid var(--border-default);border-radius:999px;padding:6px 12px;font:inherit;font-size:13px;cursor:pointer}
.tier-chip.done{color:var(--signal-up);border-color:var(--signal-up)}.tier-chip.active{background:var(--accent-primary);color:var(--on-accent);border-color:var(--accent-primary)}

.lv-chip{font-weight:700;font-size:12px;color:#1c1200;background:var(--amber);border-radius:999px;padding:3px 10px;white-space:nowrap}
/* Grid/flex children may shrink below their content, so wide strips scroll inside their own box. */
.stack{grid-template-columns:minmax(0,1fr)}.stack>*{min-width:0}
.wb-grid .metrics-grid{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}
.wb-grid .topology-strip{max-width:100%}

.lu-kicker,.lu-xp-num{color:var(--amber-text)}.sector-pill{color:var(--amber-text);border-color:var(--amber-text)}

/* Tier locking */
.tier-group.locked{opacity:.85;border-style:dashed}.tier-group.locked .tier-chip{opacity:.55;cursor:not-allowed}
.tier-chip[disabled]{pointer-events:none}.tier-group.locked .tier-title{color:var(--text-muted)}
.lock-panel{max-width:560px;margin:var(--sp-6) auto;padding:var(--sp-6);text-align:center}
.lock-badge{width:72px;height:72px;margin:0 auto var(--sp-3);display:grid;place-items:center;border-radius:50%;background:var(--bg-inset);border:1px solid var(--border-default);color:var(--amber-text)}
.lock-needs{list-style:none;padding:0;margin:var(--sp-3) 0;display:grid;gap:8px;text-align:left}
.lock-needs li{display:flex;align-items:center;gap:6px;background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:10px;padding:10px 12px;flex-wrap:wrap}
.lock-bar{flex:1 1 80px;height:5px;background:var(--bg-panel-raised);border-radius:3px;overflow:hidden;min-width:60px}.lock-bar i{display:block;height:100%;background:var(--signal-up)}
.lock-reward{color:var(--text-secondary);font-size:var(--fs-sm)}

/* Exam mode: one row per level */
.exam-tier{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px solid var(--border-subtle);flex-wrap:wrap}
.exam-tier-main{display:grid;gap:3px;min-width:0}.exam-tier-meta{font-size:var(--fs-xs);color:var(--text-muted)}
.exam-tier.locked{opacity:.7}.exam-tier .btn[disabled]{cursor:not-allowed}

/* Journey (dashboard) */
.journey{padding:var(--sp-4)}.journey-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px}
.journey-tile{display:grid;gap:8px;align-content:start;background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:12px;padding:12px}
.journey-tile.active{border-color:var(--accent-primary)}.journey-tile.finished{border-color:var(--signal-up)}
.jt-head{display:flex;gap:8px;align-items:center}.jt-meta{font-size:var(--fs-sm);color:var(--text-muted)}
.journey-focus{margin-top:var(--sp-4);padding-top:var(--sp-3);border-top:1px solid var(--border-subtle)}.journey-focus ul{margin:6px 0 8px;padding-left:1.2em;columns:2;column-gap:24px}.jf-title{font-weight:700;display:flex;gap:6px;align-items:center}
@media (max-width:640px){.journey-focus ul{columns:1}}

/* Certificates (always light paper so it prints well, in both themes) */
.cert{--ink:#0f172a;background:#fff;color:var(--ink);border-radius:14px;padding:10px;box-shadow:var(--shadow-raised);max-width:880px;margin:0 auto;aspect-ratio:1.414/1;display:flex}
.cert-inner{flex:1;border:3px double #b45309;border-radius:8px;padding:clamp(14px,3vw,36px);display:flex;flex-direction:column;align-items:center;text-align:center;gap:clamp(4px,1vw,10px);background:radial-gradient(circle at 50% 0,#fff7e6,#fff 60%)}
.cert-brand{display:flex;align-items:center;gap:8px}.cert-brand small{color:#475569}.cert-mark{background:linear-gradient(135deg,#4f46e5,#0369a1);color:#fff;border-radius:8px;padding:4px 8px;font-weight:800}
.cert-kicker{letter-spacing:.2em;text-transform:uppercase;font-size:clamp(11px,1.6vw,15px);color:#b45309;font-weight:700}
.cert-line{color:#334155;font-size:clamp(11px,1.5vw,15px)}.cert-name{font-size:clamp(22px,5vw,46px);font-weight:800;font-family:Georgia,'Times New Roman',serif;border-bottom:2px solid #cbd5e1;padding:0 18px;line-height:1.15}
.cert-track{font-size:clamp(16px,3.2vw,30px);font-weight:700;color:#4338ca}.cert-meta{display:flex;gap:clamp(8px,2vw,24px);flex-wrap:wrap;justify-content:center;color:#334155;font-size:clamp(10px,1.4vw,14px)}
.cert-foot{margin-top:auto;display:flex;gap:16px;align-items:flex-end;justify-content:space-between;width:100%;text-align:left}.cert-foot small{color:#475569;display:block;font-size:clamp(9px,1.1vw,11px);word-break:break-all}.cert-code{font-family:var(--font-mono);font-weight:700;font-size:clamp(12px,1.8vw,18px)}
.cert-qr{width:clamp(56px,10vw,96px);height:clamp(56px,10vw,96px)}.cert-qr svg{width:100%;height:100%;display:block}
.cert-wrap{margin-bottom:var(--sp-6)}.cert-actions{display:flex;gap:10px;justify-content:center;margin-top:12px;flex-wrap:wrap}.cert-todo{display:grid;gap:6px;margin-top:12px;text-align:left;max-width:420px;margin-inline:auto;color:var(--text-secondary)}
@media print{body[data-print] *{visibility:hidden}body[data-print] .cert,body[data-print] .cert *{visibility:visible}body[data-print] .cert{position:fixed;inset:0;margin:0;max-width:none;box-shadow:none;border-radius:0}@page{size:A4 landscape;margin:0}}

/* Cohort + teacher dashboard */
.lb-list{display:grid;gap:6px}.lb-row{display:flex;align-items:center;gap:10px;background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:10px;padding:8px 12px}.lb-row.you{border-color:var(--accent-primary)}
.lb-rank{width:24px;text-align:center;color:var(--amber-text);font-weight:700}.lb-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lb-streak{display:flex;gap:3px;align-items:center;color:var(--text-muted);font-size:13px}.lb-xp{min-width:72px;text-align:right}
.lb-row .avatar{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--accent-primary);color:var(--on-accent);font-weight:700;font-size:11px;flex:none}
.admin-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.admin-bar input,.admin-bar select,.admin-table select{min-height:40px;padding:6px 10px;font:inherit;font-size:14px;color:var(--text-primary);background:var(--bg-inset);border:1px solid var(--border-default);border-radius:8px}.admin-bar input{flex:1 1 200px}
.table-wrap{overflow-x:auto}.admin-table{width:100%;border-collapse:collapse;font-size:14px;min-width:760px}.admin-table th{text-align:left;color:var(--text-muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em;padding:8px;border-bottom:1px solid var(--border-default)}.admin-table td{padding:8px;border-bottom:1px solid var(--border-subtle);vertical-align:middle}
.pace-ctl{display:flex;align-items:center;gap:4px}.cohort-list{display:grid;gap:8px;margin-top:12px}.cohort-item{display:flex;gap:12px;align-items:center;flex-wrap:wrap;background:var(--bg-inset);border:1px solid var(--border-subtle);border-radius:10px;padding:8px 12px}.cohort-item code{font-family:var(--font-mono);background:var(--bg-panel);border:1px solid var(--border-default);border-radius:6px;padding:2px 8px}