/* ==========================================================================
   quizzes.css — Syllabus-linked quizzes. Uses the Royal Dark Blue / Obsidian tokens from theme.css.
   ========================================================================== */

:root {
  --qz-good: hsl(152, 68%, 48%);
  --qz-good-soft: hsla(152, 68%, 48%, 0.14);
  --qz-mid: var(--accent-warning);
  --qz-bad: var(--accent-danger);
}
html.light {
  --qz-good: hsl(152, 62%, 34%);
  --qz-good-soft: hsla(152, 62%, 34%, 0.12);
}

.qz-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 40% at 15% 0%, var(--orb-primary), transparent 70%),
    radial-gradient(ellipse 50% 40% at 90% 10%, var(--orb-secondary), transparent 70%),
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 56px 56px;
  -webkit-mask-image: linear-gradient(to bottom, #000 30%, transparent 95%);
  mask-image: linear-gradient(to bottom, #000 30%, transparent 95%);
}

.qz-main {
  max-width: 1100px;
  min-height: 80vh;
}

.qz-main h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.qz-sub { color: var(--text-secondary); margin-top: 0.35rem; max-width: 60ch; }

.qz-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-window);
  padding: clamp(1.4rem, 3.5vw, 2.4rem);
}
.qz-card[hidden], [hidden] { display: none !important; }

.qz-gate, .qz-center, .qz-done { max-width: 640px; margin: 2rem auto 0; text-align: center; }
.qz-gate h1 { margin: 1rem 0 0.6rem; }
.qz-gate p { color: var(--text-secondary); }
.qz-gate-icon {
  width: 64px; height: 64px; margin: 0 auto;
  display: grid; place-items: center;
  font-size: 1.9rem; color: var(--accent-primary);
  background: var(--accent-primary-soft);
  border: 1px solid var(--border-highlight);
  border-radius: 18px;
}
.qz-steps {
  list-style: none; counter-reset: s;
  display: grid; gap: 0.5rem;
  margin: 1.4rem auto; max-width: 380px; text-align: left;
}
.qz-steps li {
  counter-increment: s;
  display: flex; align-items: center; gap: 0.75rem;
  color: var(--text-secondary); font-size: 0.9375rem;
}
.qz-steps li::before {
  content: counter(s);
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  font: 600 0.78rem 'JetBrains Mono', monospace;
  color: var(--accent-primary); background: var(--accent-primary-soft);
}
.qz-cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; margin-top: 1.4rem; }
.qz-main .btn { cursor: pointer; font-family: inherit; }
.qz-main .btn:hover { transform: translateY(-1px); }
.qz-main .btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.qz-main .btn-solid { border: 1px solid transparent; color: #fff; }
.qz-small { padding: 0.55rem 1rem; font-size: 0.85rem; }
:where(.qz-main) :focus-visible { outline: 2px solid var(--accent-secondary); outline-offset: 3px; }

.qz-poll { margin-top: 1.2rem; font-size: 0.82rem; color: var(--text-muted); display: flex; gap: 0.5rem; align-items: center; justify-content: center; }
.qz-pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-secondary); animation: qz-pulse 1.4s ease-in-out infinite; }
@keyframes qz-pulse { 0%,100% { opacity: 0.3; transform: scale(0.8); } 50% { opacity: 1; transform: scale(1.2); } }

.qz-spinner {
  width: 38px; height: 38px; margin: 0 auto 1rem;
  border: 3px solid var(--border-subtle); border-top-color: var(--accent-primary);
  border-radius: 50%; animation: qz-spin 0.8s linear infinite;
}
@keyframes qz-spin { to { transform: rotate(360deg); } }

.qz-banner {
  margin-bottom: 1rem; padding: 0.8rem 1.1rem;
  border-radius: 12px; font-size: 0.9rem;
  background: var(--accent-danger-soft); color: var(--text-primary);
  border: 1px solid var(--accent-danger);
}

/* ---------- Chapters dashboard ---------- */
.qz-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; flex-wrap: wrap; }

.qz-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1.5rem 0 0.5rem; }
.qz-tab {
  font: 600 0.85rem 'Plus Jakarta Sans', sans-serif;
  padding: 0.5rem 1rem; border-radius: 9999px; cursor: pointer;
  color: var(--text-secondary); background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.qz-tab:hover { border-color: var(--border-highlight); color: var(--text-primary); }
.qz-tab[aria-selected="true"] { background: var(--accent-primary); border-color: var(--accent-primary); color: #fff; }

.qz-section { margin-top: 2rem; scroll-margin-top: 6rem; }
.qz-section-head { display: flex; align-items: center; flex-wrap: wrap; gap: 0.6rem 1rem; margin-bottom: 0.9rem; }
.qz-section-head h2 { font-size: 1.3rem; font-weight: 800; letter-spacing: -0.02em; }
.qz-exam {
  font: 500 0.72rem 'JetBrains Mono', monospace; letter-spacing: 0.02em;
  padding: 0.22rem 0.6rem; border-radius: 9999px;
  color: var(--accent-secondary); background: var(--accent-secondary-soft);
}
.qz-mastery { margin-left: auto; display: flex; align-items: center; gap: 0.7rem; font-size: 0.8rem; color: var(--text-muted); }
.qz-mastery-bar { width: 120px; height: 6px; border-radius: 6px; background: var(--bg-elevated); overflow: hidden; }
.qz-mastery-bar > i { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary)); transition: width 0.6s ease; }

.qz-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0.9rem; }

.qz-chapter {
  position: relative; text-align: left; font: inherit; color: inherit; cursor: pointer;
  display: flex; flex-direction: column; gap: 0.7rem; min-height: 118px;
  padding: 1.05rem 1.1rem;
  background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.qz-chapter:hover:not(:disabled), .qz-chapter:focus-visible { transform: translateY(-3px); border-color: var(--border-highlight); box-shadow: 0 16px 40px -22px var(--glow-primary); }
.qz-chapter:disabled { cursor: not-allowed; opacity: 0.7; }
.qz-chapter.flash { animation: qz-flash 1.8s ease 2; }
@keyframes qz-flash { 0%,100% { box-shadow: 0 0 0 0 transparent; } 40% { box-shadow: 0 0 0 4px var(--glow-primary); border-color: var(--accent-primary); } }

.qz-ch-top { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.qz-ch-num { font: 500 0.75rem 'JetBrains Mono', monospace; color: var(--text-muted); }
.qz-ch-title { font-weight: 700; font-size: 0.97rem; line-height: 1.35; letter-spacing: -0.01em; }
.qz-ch-foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; font-size: 0.78rem; color: var(--text-muted); }
.qz-badge { font: 700 0.78rem 'JetBrains Mono', monospace; padding: 0.15rem 0.5rem; border-radius: 8px; }
.qz-badge.good { color: var(--qz-good); background: var(--qz-good-soft); }
.qz-badge.mid { color: var(--qz-mid); background: var(--accent-warning-soft); }
.qz-badge.bad { color: var(--qz-bad); background: var(--accent-danger-soft); }

/* ---------- Hover popover ---------- */
.qz-pop {
  position: fixed; z-index: 200; width: min(320px, calc(100vw - 24px));
  padding: 1rem 1.1rem; border-radius: 16px;
  background: color-mix(in srgb, var(--bg-surface) 78%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(1.4); backdrop-filter: blur(18px) saturate(1.4);
  border: 1px solid var(--border-highlight);
  box-shadow: 0 24px 60px -20px hsla(225, 60%, 2%, 0.8), 0 0 0 1px hsla(0,0%,100%,0.04) inset;
  pointer-events: none;
  animation: qz-pop-in 0.16s ease-out;
}
@keyframes qz-pop-in { from { opacity: 0; transform: translateY(4px) scale(0.98); } }
.qz-pop-pct { font-size: 2.2rem; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.qz-pop-pct.good { color: var(--qz-good); } .qz-pop-pct.mid { color: var(--qz-mid); } .qz-pop-pct.bad { color: var(--qz-bad); }
.qz-pop-score { font-size: 0.8rem; color: var(--text-muted); margin-left: 0.5rem; font-weight: 500; letter-spacing: 0; }
.qz-pop-msg { margin-top: 0.6rem; font-size: 0.86rem; line-height: 1.45; color: var(--text-primary); }
.qz-pop-weak { margin-top: 0.7rem; font-size: 0.8rem; color: var(--text-secondary); }
.qz-pop-weak b { display: block; font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.3rem; }
.qz-pop-weak span { display: inline-block; margin: 0 0.3rem 0.3rem 0; padding: 0.15rem 0.5rem; border-radius: 9999px; background: var(--accent-danger-soft); color: var(--text-primary); font-size: 0.74rem; }
.qz-pop-cta { margin-top: 0.6rem; padding-top: 0.6rem; border-top: 1px solid var(--border-subtle); font-size: 0.76rem; color: var(--accent-secondary); }

/* ---------- Quiz runner ---------- */
.qz-quiz { max-width: 760px; margin: 1rem auto 0; }
.qz-quiz-top { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.qz-link { background: none; border: 0; cursor: pointer; font: 600 0.85rem 'Plus Jakarta Sans', sans-serif; color: var(--text-secondary); }
.qz-link:hover { color: var(--text-primary); }
.qz-quiz-meta { font: 500 0.75rem 'JetBrains Mono', monospace; color: var(--text-muted); }
.qz-quiz-title { margin: 1.1rem 0 1rem; font-size: 1.15rem; font-weight: 700; color: var(--text-secondary); }
.qz-progress { height: 5px; border-radius: 5px; background: var(--bg-elevated); overflow: hidden; }
.qz-progress > div { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary)); transition: width 0.35s ease; }
.qz-qcount { margin: 1.1rem 0 0.4rem; font: 500 0.78rem 'JetBrains Mono', monospace; color: var(--text-muted); }
.qz-subtopic { display: inline-block; font-size: 0.72rem; font-weight: 600; padding: 0.2rem 0.6rem; border-radius: 9999px; color: var(--accent-primary); background: var(--accent-primary-soft); }
.qz-question { margin: 0.8rem 0 1.2rem; font-size: clamp(1.1rem, 2.2vw, 1.35rem); line-height: 1.45; font-weight: 700; letter-spacing: -0.015em; outline: none; }
.qz-options { display: grid; gap: 0.65rem; }
.qz-opt {
  display: flex; gap: 0.85rem; align-items: flex-start; text-align: left; width: 100%;
  font: 500 0.97rem/1.45 'Plus Jakarta Sans', sans-serif; color: var(--text-primary); cursor: pointer;
  padding: 0.85rem 1rem; border-radius: 14px;
  background: var(--bg-elevated); border: 1px solid var(--border-subtle);
  transition: border-color 0.18s, background 0.18s, transform 0.18s;
}
.qz-opt:hover { border-color: var(--border-highlight); transform: translateX(2px); }
.qz-opt-key { flex: none; width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; font: 600 0.78rem 'JetBrains Mono', monospace; color: var(--text-muted); background: var(--bg-surface); }
.qz-opt[aria-checked="true"] { border-color: var(--accent-primary); background: var(--accent-primary-soft); }
.qz-opt[aria-checked="true"] .qz-opt-key { background: var(--accent-primary); color: #fff; }
.qz-quiz-nav { display: flex; justify-content: space-between; gap: 0.75rem; margin-top: 1.6rem; }

/* ---------- Completion ---------- */
.qz-ring {
  --p: 0; --c: var(--qz-good);
  width: 132px; height: 132px; margin: 0 auto 1rem; border-radius: 50%;
  display: grid; place-items: center;
  background: conic-gradient(var(--c) calc(var(--p) * 1%), var(--bg-elevated) 0);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 11px), #000 calc(100% - 10px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 11px), #000 calc(100% - 10px));
  position: relative;
}
.qz-ring.good { --c: var(--qz-good); } .qz-ring.mid { --c: var(--qz-mid); } .qz-ring.bad { --c: var(--qz-bad); }
.qz-ring-wrap { position: relative; width: 132px; margin: 0 auto 1rem; }
.qz-ring-wrap .qz-ring { margin: 0; }
.qz-ring-label { position: absolute; inset: 0; display: grid; place-items: center; font-size: 2rem; font-weight: 800; letter-spacing: -0.04em; }
.qz-done h2 { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em; }
.qz-done-score { color: var(--text-secondary); margin-top: 0.2rem; }
.qz-tier { margin: 1rem auto 0; max-width: 46ch; font-weight: 600; line-height: 1.5; }
.qz-weak { margin-top: 0.7rem; font-size: 0.88rem; color: var(--text-secondary); }
.qz-review { margin-top: 1.6rem; text-align: left; display: grid; gap: 0.9rem; }
.qz-rv { padding: 1rem 1.1rem; border-radius: 14px; background: var(--bg-elevated); border-left: 3px solid var(--qz-bad); }
.qz-rv.ok { border-left-color: var(--qz-good); }
.qz-rv h4 { font-size: 0.95rem; line-height: 1.45; margin-bottom: 0.5rem; }
.qz-rv p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; margin-top: 0.25rem; }
.qz-rv p b { color: var(--text-primary); }

@media (max-width: 640px) {
  .qz-mastery { margin-left: 0; width: 100%; }
  .qz-quiz-nav .btn { flex: 1; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  .qz-chapter, .qz-opt, .qz-pop, .qz-pulse, .qz-spinner, .qz-chapter.flash { animation: none; transition: none; }
}

.qz-inline-error {
  margin-top: 1.2rem; padding: 0.75rem 1rem; border-radius: 12px; font-size: 0.9rem; line-height: 1.45;
  background: var(--accent-danger-soft); border: 1px solid var(--accent-danger); color: var(--text-primary);
}
.qz-inline-error button { all: unset; cursor: pointer; text-decoration: underline; margin-left: 0.4rem; font-weight: 700; }

/* Completed chapters: one attempt only */
.qz-chapter.done { cursor: default; }
.qz-chapter.done:hover, .qz-chapter.done:focus-visible { transform: none; }

/* ---- syllabus upload (computer) ---- */
.qz-or { display: flex; align-items: center; gap: 0.8rem; margin: 1.6rem 0 1rem; color: var(--text-muted); font-size: 0.82rem; }
.qz-or::before, .qz-or::after { content: ""; flex: 1; height: 1px; background: currentColor; opacity: 0.25; }
.qz-upload textarea {
  width: 100%; margin: 0.9rem 0 0.6rem; padding: 0.7rem 0.8rem; border-radius: 10px; resize: vertical;
  font: inherit; color: inherit; background: transparent; border: 1px solid rgba(128, 128, 128, 0.35);
}
.qz-upload textarea:focus { outline: 2px solid var(--accent, #6c8cff); outline-offset: 1px; }
.qz-file-name { margin-top: 0.8rem; font-size: 0.85rem; word-break: break-all; }
.qz-upload-status { margin-top: 0.8rem; font-size: 0.88rem; }
.qz-upload-status.err { color: #e5484d; }
.qz-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }