/* Nova: the AI voice tutor inside the portal. The live stage is a dark, single-look overlay;
   the rest (tabs, tables, student home) uses the portal's own tokens. */
:root {
  --nova-ink: #070c18; --nova-panel: #0d1628; --nova-line: #1f3150;
  --nova-fg: #e9f1f8; --nova-soft: #a7b6cc; --nova-dim: #6c7d98;
  --nova-cyan: #5ae1eb; --nova-green: #63c98a; --nova-amber: #f2b544; --nova-red: #ef7a6c;
  --nova-display: "Oxanium", "Lato", system-ui, sans-serif;
}

/* ---------- live stage (overlay) ---------- */
.nv-stage { position: fixed; inset: 0; z-index: 30; background: var(--nova-ink); color: var(--nova-fg);
  background-image: radial-gradient(900px 600px at 10% -10%, rgba(76,182,114,.18), transparent 60%), radial-gradient(800px 600px at 110% 110%, rgba(60,140,230,.16), transparent 60%);
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); grid-template-rows: auto 1fr auto; gap: 0;
  padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); color-scheme: dark; }
.nv-top { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 20px; border-bottom: 1px solid var(--nova-line); flex-wrap: wrap; }
.nv-brand { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.nv-brand b { font-family: var(--nova-display); letter-spacing: .32em; font-size: 1.5rem; }
.nv-brand span { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; color: var(--nova-cyan); text-transform: uppercase; }
.nv-timer { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 1.05rem; color: var(--nova-soft); }
.nv-timer.low { color: var(--nova-amber); }
.nv-face { position: relative; min-height: 0; display: flex; flex-direction: column; }
.nv-face canvas { width: 100%; height: 100%; flex: 1; display: block; min-height: 260px; }
.nv-chip { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); display: inline-flex; align-items: center; gap: 9px; font-family: var(--font-mono); font-size: .85rem; letter-spacing: .12em; padding: 7px 16px; border-radius: 999px; border: 1.5px solid currentColor; color: var(--nova-dim); background: rgba(7,12,24,.8); white-space: nowrap; }
.nv-chip i { width: 9px; height: 9px; border-radius: 50%; background: currentColor; }
.nv-chip[data-s="listen"] { color: var(--nova-green); } .nv-chip[data-s="speak"] { color: var(--nova-cyan); } .nv-chip[data-s="think"], .nv-chip[data-s="connect"] { color: var(--nova-amber); } .nv-chip[data-s="error"] { color: var(--nova-red); }
@media (prefers-reduced-motion: no-preference) { .nv-chip i { animation: nvpulse 1.2s infinite; } @keyframes nvpulse { 50% { opacity: .35; } } }
.nv-side { border-left: 1px solid var(--nova-line); display: flex; flex-direction: column; min-height: 0; background: rgba(13,22,40,.6); }
.nv-log { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; min-height: 0; }
.nv-msg { max-width: 88%; border-radius: 16px; padding: 10px 14px; line-height: 1.45; overflow-wrap: anywhere; font-size: 1rem; }
.nv-msg.ai { align-self: flex-start; background: #122f3d; border: 1px solid rgba(90,225,235,.45); }
.nv-msg.user { align-self: flex-end; background: #225f3c; border: 1px solid rgba(99,201,138,.6); }
.nv-msg small { display: block; font-family: var(--font-mono); font-size: .66rem; letter-spacing: .14em; color: var(--nova-cyan); margin-bottom: 3px; }
.nv-msg.user small { color: #bfeccf; }
.nv-fix { align-self: stretch; border: 1.5px solid var(--nova-amber); background: rgba(242,181,68,.08); border-radius: 14px; padding: 10px 13px; }
.nv-fix s { color: var(--nova-red); } .nv-fix strong { color: var(--nova-green); }
.nv-fix span { display: block; color: var(--nova-soft); font-size: .88rem; margin-top: 3px; }
.nv-fix em { font-style: normal; font-family: var(--font-mono); font-size: .66rem; letter-spacing: .14em; color: var(--nova-amber); display: block; margin-bottom: 4px; }
.nv-hint { color: var(--nova-soft); font-size: .92rem; padding: 4px 2px; }
.nv-bottom { grid-column: 1 / -1; display: flex; gap: 10px; align-items: center; justify-content: center; padding: 14px 20px; border-top: 1px solid var(--nova-line); flex-wrap: wrap; }
.nv-btn { font: inherit; font-weight: 700; border-radius: 12px; border: 1px solid var(--nova-line); background: #13203a; color: var(--nova-fg); padding: 11px 18px; cursor: pointer; }
.nv-btn:hover { border-color: var(--nova-cyan); }
.nv-btn.end { background: #7a2b25; border-color: #a4423a; }
.nv-btn.go { background: var(--accent-fill, #4cb672); border-color: transparent; color: #06130b; }
.nv-btn[aria-pressed="true"] { border-color: var(--nova-amber); color: var(--nova-amber); }
.nv-btn:focus-visible { outline: 3px solid var(--nova-cyan); outline-offset: 2px; }
.nv-sum { display: flex; flex-direction: column; gap: 14px; align-items: center; justify-content: center; text-align: center; padding: 24px; }
.nv-sum h2 { font-family: var(--nova-display); font-size: 1.6rem; color: var(--nova-fg); }
.nv-sum p { color: var(--nova-soft); max-width: 46ch; }
.nv-sum .nums { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.nv-sum .nums div { border: 1px solid var(--nova-line); border-radius: 14px; padding: 10px 18px; min-width: 120px; }
.nv-sum .nums b { display: block; font-family: var(--nova-display); font-size: 1.6rem; font-variant-numeric: tabular-nums; }
.nv-sum .nums span { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em; color: var(--nova-dim); text-transform: uppercase; }
.nv-stage.class .nv-msg { font-size: 1.25rem; }
.nv-type { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--nova-line); }
.nv-type input { flex: 1; min-width: 0; font: inherit; font-size: 1rem; color: var(--nova-fg); background: #0b1426; border: 1px solid var(--nova-line); border-radius: 12px; padding: 10px 12px; }
.nv-type input:focus-visible { outline: 3px solid var(--nova-cyan); outline-offset: 1px; }
.nv-type input::placeholder { color: var(--nova-dim); }
.nv-voice { position: absolute; left: 50%; top: 14px; transform: translateX(-50%); font-family: var(--font-mono); font-size: .75rem; letter-spacing: .06em; color: var(--nova-soft); background: rgba(7,12,24,.8); border: 1px solid var(--nova-line); border-radius: 999px; padding: 5px 12px; white-space: nowrap; max-width: calc(100% - 24px); overflow: hidden; text-overflow: ellipsis; }
.nv-btn.mic { background: #123d2a; border-color: var(--nova-green); color: #dff7e8; min-width: 190px; }
.nv-btn.mic[aria-pressed="true"] { background: var(--nova-green); color: #06130b; border-color: transparent; }
.nv-btn:disabled { opacity: .55; cursor: wait; }
@media (max-width: 820px) {
  .nv-stage { grid-template-columns: 1fr; grid-template-rows: auto minmax(220px, 42vh) 1fr auto; }
  .nv-side { border-left: 0; border-top: 1px solid var(--nova-line); }
  .nv-face canvas { min-height: 200px; }
}

/* ---------- student home ---------- */
.nv-home { max-width: 980px; margin: 0 auto; padding-inline: 16px; padding-block: 18px 60px; display: flex; flex-direction: column; gap: 18px; }
.nv-home-top { display: flex; align-items: center; gap: 12px; justify-content: space-between; flex-wrap: wrap; }
.nv-hero { border-radius: 18px; background: var(--nova-ink); color: var(--nova-fg); color-scheme: dark; padding: 22px; display: grid; grid-template-columns: minmax(0, 220px) minmax(0, 1fr); gap: 22px; align-items: center;
  background-image: radial-gradient(500px 300px at 0% 0%, rgba(76,182,114,.22), transparent 60%), radial-gradient(500px 300px at 100% 100%, rgba(60,140,230,.18), transparent 60%); }
.nv-hero img { width: 100%; max-width: 220px; aspect-ratio: 1; }
.nv-hero h1 { font-family: var(--nova-display); font-size: 1.9rem; color: var(--nova-fg); }
.nv-hero p { color: var(--nova-soft); max-width: 52ch; }
.nv-hero .lbl { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; color: var(--nova-cyan); text-transform: uppercase; }
.nv-meter { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; max-width: 420px; }
.nv-meter .bar { background: rgba(255,255,255,.12); } .nv-meter .bar > i { background: var(--nova-green); }
.nv-meter span { font-family: var(--font-mono); font-size: .8rem; color: var(--nova-soft); font-variant-numeric: tabular-nums; }
@media (max-width: 600px) { .nv-hero { grid-template-columns: 1fr; } .nv-hero img { max-width: 140px; justify-self: center; } }
.nv-modes { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 12px; }
.nv-mode { text-align: left; border: 1px solid var(--line); background: var(--surface); border-radius: 14px; padding: 16px; cursor: pointer; display: flex; flex-direction: column; gap: 4px; color: var(--ink); }
.nv-mode:hover { border-color: var(--accent-fill); }
.nv-mode b { font-size: 1.05rem; } .nv-mode span { color: var(--muted); font-size: .88rem; }
.nv-mode:disabled { opacity: .55; cursor: not-allowed; }
.nv-fixes { display: flex; flex-direction: column; }
.nv-fixes .li s { color: var(--bad); } .nv-fixes .li strong { color: var(--ok); }

/* ---------- staff views ---------- */
.nv-creds { border: 2px solid var(--accent-fill); border-radius: var(--r); padding: 16px; display: flex; flex-direction: column; gap: 12px; background: var(--accent-soft); }
.nv-creds table td.code { font-family: var(--font-mono); font-weight: 700; letter-spacing: .04em; }
.nv-class { border-radius: var(--r); padding: 20px; background: var(--nova-ink); color: var(--nova-fg); color-scheme: dark; display: grid; grid-template-columns: minmax(0, 160px) minmax(0, 1fr); gap: 20px; align-items: center; }
.nv-class img { width: 100%; max-width: 160px; aspect-ratio: 1; }
.nv-class h2 { color: var(--nova-fg); font-family: var(--nova-display); }
.nv-class p { color: var(--nova-soft); }
.nv-class select { background: #13203a; color: var(--nova-fg); border-color: var(--nova-line); }
.nv-class .field > span { color: var(--nova-soft); }
@media (max-width: 600px) { .nv-class { grid-template-columns: 1fr; } .nv-class img { max-width: 110px; } }
.nv-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.nv-chips button { border: 1px solid var(--nova-line); background: transparent; color: var(--nova-soft); border-radius: 999px; padding: 6px 12px; font-weight: 700; font-size: .85rem; cursor: pointer; }
.nv-chips button[aria-pressed="true"] { background: var(--nova-green); border-color: var(--nova-green); color: #06130b; }
.nv-toggle, .form .nv-toggle.field { display: flex; flex-direction: row; gap: 8px; align-items: center; font-weight: 700; }
.nv-toggle input { width: auto; }