:root {
  --bg: #0a0a0f;
  --surface: #12111a;
  --surface2: #1a1826;
  --border: #2e2a42;
  --accent: #b197fc;
  --accent-dim: rgba(177,151,252,0.12);
  --accent2: #f5c518;
  --text: #e8e4f0;
  --muted: #6e6a82;
  --tag-bg: #1e1a2e;
  --tag-text: #c4b5fd;
  --gold: #f5c518;
  --header-bg: rgba(10,10,15,0.93);
  --shadow: rgba(0,0,0,0.5);
}

/* LIGHT MODE — UW purple/gold on light surfaces, WCAG AA contrast */
:root[data-theme="light"] {
  --bg: #f7f6fb;
  --surface: #ffffff;
  --surface2: #f0edf8;
  --border: #d9d3ea;
  --accent: #6b4fc0;          /* darker purple for contrast on light bg */
  --accent-dim: rgba(107,79,192,0.10);
  --accent2: #9a7a00;
  --text: #1a1726;
  --muted: #5a5570;           /* 4.6:1 on --bg, passes AA */
  --tag-bg: #ede8fa;
  --tag-text: #5a3fb0;
  --gold: #8a6d00;            /* darker gold so it's readable on white */
  --header-bg: rgba(247,246,251,0.95);
  --shadow: rgba(80,60,140,0.12);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

/* HEADER */
header {
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  z-index: 100;
}

body { transition: background-color 0.2s ease, color 0.2s ease; }

.logo {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.logo span { color: var(--gold); }

.header-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 4px;
}
.logo { text-decoration: none; }
.header-actions { display: flex; align-items: center; gap: 0.5rem; }
.icon-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 32px; height: 32px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 0.95rem;
  display: inline-flex; align-items: center; justify-content: center;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

/* visible keyboard focus everywhere (accessibility) */
a:focus-visible, button:focus-visible, select:focus-visible,
input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* skip-to-content link for screen readers / keyboard users */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--accent); color: #14111f;
  padding: 0.6rem 1rem; border-radius: 0 0 8px 0;
  font-weight: 600; text-decoration: none;
}
.skip-link:focus { left: 0; }

/* HERO */
.hero {
  padding: 4rem 2rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-sub {
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 520px;
}

/* SEARCH BAR */
.search-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 1.5rem;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 1rem;
  transition: border-color 0.15s;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(177,151,252,0.1);
}

.search-icon {
  color: var(--muted);
  font-size: 1rem;
  margin-right: 0.6rem;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  padding: 0.85rem 0;
}

.search-input::placeholder { color: var(--muted); }

.clear-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  font-size: 1rem;
  line-height: 1;
  display: none;
}
.clear-btn.visible { display: block; }
.clear-btn:hover { color: var(--text); }

/* FILTERS */
.filters-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 2rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  white-space: nowrap;
}

select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 0.45rem 2rem 0.45rem 0.75rem;
  font-size: 0.85rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236e6a82' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  transition: border-color 0.15s;
}

select:focus { outline: none; border-color: var(--accent); }

.reset-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 7px;
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all 0.15s;
}
.reset-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Midterm mode quick-toggle — a pressable chip in the filter row */
.midterm-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 7px;
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all 0.15s;
  white-space: nowrap;
}
.midterm-toggle:hover { border-color: var(--accent); color: var(--accent); }
.midterm-toggle[aria-pressed="true"] {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

/* RESULTS INFO */
.results-info {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 1rem;
  font-size: 0.8rem;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.results-count {
  color: var(--accent);
  font-weight: 500;
}

/* EXAM CARDS */
.cards-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.4rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  transition: border-color 0.15s, background 0.15s;
}

.card:hover {
  border-color: var(--accent);
  background: var(--surface2);
}

.card-left { flex: 1; min-width: 0; }

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.course-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}

.badge-120 { background: rgba(245,197,24,0.15); color: var(--gold); }
.badge-124 { background: rgba(177,151,252,0.15); color: #c4b5fd; }
.badge-125 { background: rgba(177,151,252,0.25); color: var(--accent); }
.badge-126 { background: rgba(245,197,24,0.25); color: var(--gold); }
.badge-207 { background: rgba(177,151,252,0.15); color: #c4b5fd; }
.badge-208 { background: rgba(245,197,24,0.15); color: var(--gold); }
.badge-224 { background: rgba(52,211,153,0.15); color: #6ee7b7; }
/* the pale purple/green above are too faint on the light background (AA needs 4.5:1) */
:root[data-theme="light"] .badge-207 { color: #6d28d9; }
:root[data-theme="light"] .badge-224 { color: #047857; }

.exam-type-badge {
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(110,106,130,0.1);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'IBM Plex Mono', monospace;
}

.card-title {
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 0.45rem;
  color: var(--text);
}

.card-note {
  margin: -0.2rem 0 0.45rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 100px;
  font-family: 'IBM Plex Mono', monospace;
}

.card-right {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-shrink: 0;
  align-items: flex-end;
}

.quarter-label {
  font-size: 0.72rem;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
  white-space: nowrap;
}

.btn-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* answers we wrote ourselves because no official key was published */
.key-btn.unofficial { border-style: dashed; }

.view-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(177,151,252,0.25);
  border-radius: 7px;
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.view-btn:hover {
  background: rgba(177,151,252,0.2);
  border-color: var(--accent);
}

.key-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: rgba(245,197,24,0.08);
  color: var(--gold);
  border: 1px solid rgba(245,197,24,0.25);
  border-radius: 7px;
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.key-btn:hover {
  background: rgba(245,197,24,0.15);
  border-color: var(--gold);
}

/* EMPTY STATE */
.empty {
  max-width: 860px;
  margin: 2rem auto;
  padding: 3rem 2rem;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
}

.empty-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.empty h3 { font-size: 1rem; font-weight: 500; color: var(--text); margin-bottom: 0.5rem; }
.empty p { font-size: 0.85rem; }

/* SUBMIT BANNER */
.submit-banner {
  max-width: 860px;
  margin: 0 auto 1.5rem;
  padding: 0 2rem;
}

.submit-inner {
  background: linear-gradient(135deg, rgba(177,151,252,0.07), rgba(245,197,24,0.05));
  border: 1px solid rgba(177,151,252,0.2);
  border-radius: 10px;
  padding: 1rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.submit-text { font-size: 0.85rem; color: var(--muted); }
.submit-text strong { color: var(--text); }

.submit-link {
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  border: 1px solid rgba(177,151,252,0.25);
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  transition: all 0.15s;
  white-space: nowrap;
}
.submit-link:hover { background: var(--accent-dim); }

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* exam card: link to the department archive page an exam came from */
.source-link { font-size: 0.7rem; color: var(--muted); text-decoration: none; font-family: 'IBM Plex Mono', monospace; }
.source-link:hover { color: var(--accent); text-decoration: underline; }

/* "Browse by course" row above the footer */
.course-links {
  max-width: 860px; margin: 2rem auto 0; padding: 0 2rem;
  display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; align-items: baseline;
  font-size: 0.8rem; font-family: 'IBM Plex Mono', monospace;
}
.course-links-label { color: var(--muted); }
.course-links a, .course-page-link { color: var(--accent); text-decoration: none; }
.course-links a:hover, .course-page-link:hover { text-decoration: underline; }
.course-page-link { margin-left: 1rem; font-size: 0.8rem; }
@media (max-width: 600px) { .course-links { padding: 0 1rem; } }

.footer-left {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
}

.footer-authors {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.footer-author {
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  transition: color 0.15s;
}

.footer-author:hover { color: var(--gold); }

.footer-privacy {
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  margin-left: 0.9rem;
  border-bottom: 1px dotted var(--border);
  transition: color 0.15s;
}
.footer-privacy:hover { color: var(--accent); }

/* Highlight match */
mark {
  background: rgba(245,197,24,0.25);
  color: var(--gold);
  border-radius: 2px;
  padding: 0 2px;
}

/* ───────────── VIEW TOGGLE (Find / Generate) ───────────── */
.view-nav {
  max-width: 860px;                /* same column as .hero and .search-wrap, so the tab row lines up with the search box */
  margin: 1.5rem auto 0;
  padding: 0 2rem;
  display: flex;
  flex-wrap: wrap;                 /* five tabs: wrap onto a second row rather than hide one off-screen */
  justify-content: center;         /* centre the row (and a wrapped second row) under the page */
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;           /* Firefox: hide the strip's scrollbar */
}
.view-nav::-webkit-scrollbar { display: none; }  /* WebKit: hide it too */
.view-tab {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
  font-size: 0.8rem;
  font-family: 'IBM Plex Mono', monospace;
  cursor: pointer;
  transition: all 0.15s;
  flex: 1 1 auto;                  /* the tabs share the column's full width, edge to edge */
  text-align: center;
  white-space: nowrap;
}
.view-tab:hover { color: var(--text); border-color: var(--accent); }
.view-tab.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}
.view-tab .tab-gold { color: var(--gold); }

/* hide whichever view is inactive */
.view-panel[hidden] { display: none; }

/* QUESTION SEARCH cards */
.q-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  gap: 1rem;
  transition: border-color 0.15s, background 0.15s;
}
.q-card:hover { border-color: var(--accent); background: var(--surface2); }
.q-thumb {
  flex-shrink: 0; width: 200px; max-height: 150px; overflow: hidden;
  border-radius: 6px; background: #fff; border: 1px solid var(--border);
}
.q-thumb img { width: 100%; height: auto; display: block; }
.q-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.q-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.q-chapter { font-size: 0.9rem; font-weight: 500; color: var(--text); }
.q-source { font-size: 0.75rem; color: var(--muted); font-family: 'IBM Plex Mono', monospace; }
.q-lowconf { font-size: 0.62rem; color: var(--muted); opacity: 0.55; cursor: help; letter-spacing: 0.02em; }
.q-lowconf:hover { opacity: 0.9; color: var(--gold); }
.q-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: auto; }

/* CHANGELOG MODAL */
.modal-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center;
  padding: 4vh 1rem;
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  max-width: 560px; width: 100%;
  max-height: 92vh;                 /* cap height so the modal never overflows the screen */
  display: flex; flex-direction: column;  /* header fixed, body scrolls */
  overflow: hidden;                 /* keep rounded corners clean while body scrolls */
  box-shadow: 0 12px 48px var(--shadow);
  animation: modalIn 0.18s ease;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
.modal-head {
  flex-shrink: 0;                   /* header stays put; it no longer needs sticky */
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 1.4rem; border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.modal-head h2 { font-size: 1.1rem; font-weight: 600; color: var(--text); }
.modal-body { padding: 1.2rem 1.4rem; overflow-y: auto; }  /* only the content scrolls */
.cl-entry { margin-bottom: 1.3rem; }
.cl-entry:last-child { margin-bottom: 0; }
.cl-ver {
  display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 0.4rem;
}
.cl-ver .v { font-family: 'IBM Plex Mono', monospace; font-weight: 600; color: var(--accent); font-size: 0.9rem; }
.cl-ver .d { font-size: 0.72rem; color: var(--muted); }
.cl-entry ul { margin: 0 0 0 1.1rem; }
.cl-entry li { font-size: 0.86rem; color: var(--text); margin-bottom: 0.25rem; line-height: 1.5; }

@media (max-width: 600px) {
  .q-card { flex-direction: column; }
  .q-thumb { width: 100%; max-height: 220px; }
}

/* ───────────── TOPICS MOST TESTED ───────────── */
.topics-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.topic-row {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
}
.topic-row-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}
.topic-name { font-size: 0.9rem; font-weight: 500; color: var(--text); }
.topic-rank {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  margin-right: 0.5rem;
}
.topic-stat {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  white-space: nowrap;
}
.topic-bar-track {
  height: 8px;
  background: var(--surface2);
  border-radius: 100px;
  overflow: hidden;
}
.topic-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  border-radius: 100px;
  transition: width 0.4s ease;
}
.topics-note {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem 1rem;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ───────────── GENERATOR PANEL ───────────── */
.gen-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 2rem 4rem;
}
.gen-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.6rem;
  margin-bottom: 1.5rem;
}
.gen-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.3rem;
}
.gen-field { display: flex; flex-direction: column; gap: 0.4rem; }
.gen-field label {
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: 'IBM Plex Mono', monospace;
}
.gen-field select, .gen-field input[type="number"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  font-family: 'Inter', sans-serif;
  min-width: 160px;
}
.gen-field input[type="number"] { width: 90px; min-width: 0; }
.gen-field select:focus, .gen-field input:focus { outline: none; border-color: var(--accent); }

.chapters-block { margin-bottom: 1.3rem; }
.chapters-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.7rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chapters-head .lbl {
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: 'IBM Plex Mono', monospace;
}
.chapters-head .mini {
  font-size: 0.72rem;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
}
.chapters-head .mini:hover { color: var(--gold); }

.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.5rem;
}
.chapter-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  cursor: pointer;
  transition: border-color 0.15s;
}
.chapter-item:hover { border-color: var(--accent); }
.chapter-item.disabled { opacity: 0.35; cursor: not-allowed; }
.chapter-item input { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }
.chapter-item .ch-name { font-size: 0.85rem; color: var(--text); }
.chapter-item .ch-count {
  margin-left: auto;
  font-size: 0.68rem;
  color: var(--muted);
  font-family: 'IBM Plex Mono', monospace;
}

.gen-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; }
.gen-btn {
  background: linear-gradient(135deg, var(--accent), #9472e0);
  color: #14111f;
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: filter 0.15s, transform 0.05s;
}
.gen-btn:hover { filter: brightness(1.1); }
.gen-btn:active { transform: translateY(1px); }
.gen-btn.gold {
  background: linear-gradient(135deg, var(--gold), #d6a800);
}
.gen-btn.ghost {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
}
.gen-btn.ghost:hover { border-color: var(--accent); color: var(--accent); filter: none; }
.gen-note { font-size: 0.78rem; color: var(--muted); margin-top: 0.9rem; line-height: 1.5; }
.custom-divider { border-top: 1px solid var(--border); margin: 1.4rem 0; }
#customControls[hidden] { display: none; }

/* ───────────── GENERATED EXAM (print-styled) ───────────── */
.exam-paper {
  background: #ffffff;
  color: #111;
  border-radius: 10px;
  padding: 2.5rem;
  margin-top: 1.5rem;
  font-family: 'Georgia', 'Times New Roman', serif;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}
.exam-cover { border-bottom: 2px solid #111; padding-bottom: 1.2rem; margin-bottom: 1.5rem; }
.exam-cover h2 { font-size: 1.4rem; margin-bottom: 0.3rem; color: #111; font-weight: 700; }
.exam-cover .sub { font-size: 0.9rem; color: #444; margin-bottom: 1rem; }
.exam-cover .fields { display: flex; gap: 2rem; flex-wrap: wrap; font-size: 0.85rem; color: #333; }
.exam-cover .fields .f { border-bottom: 1px solid #999; min-width: 180px; padding-bottom: 2px; }
.exam-instructions { font-size: 0.8rem; color: #333; margin: 1rem 0 0; line-height: 1.6; }
.exam-instructions li { margin-left: 1.1rem; margin-bottom: 0.2rem; }
.exam-attrib { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid #ccc; font-size: 0.72rem; color: #555; line-height: 1.5; page-break-inside: avoid; }
.exam-attrib .attrib-title { font-weight: 700; color: #333; margin-bottom: 0.4rem; font-size: 0.8rem; }
.exam-attrib ul { margin: 0.5rem 0 0 1.1rem; }
.exam-attrib li { margin-bottom: 0.15rem; }

.exam-problem { margin: 1.8rem 0; page-break-inside: avoid; }
.exam-problem .p-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.6rem; border-bottom: 1px solid #ddd; padding-bottom: 0.3rem;
}
.exam-problem .p-num { font-weight: 700; font-size: 1rem; color: #111; }
.exam-problem .p-pts { font-size: 0.8rem; color: #666; }
.exam-problem .p-src { font-size: 0.68rem; color: #aaa; font-family: monospace; }
.exam-problem img, .exam-problem svg { max-width: 100%; height: auto; display: block; border: 0; }
.exam-problem .zoom { display: block; cursor: zoom-in; }   /* tap to open the full-size image (pinch to zoom on phones) */
.exam-problem .answer-block {
  margin-top: 0.8rem; padding: 0.8rem; background: #f6f2ff;
  border-left: 3px solid #9472e0; border-radius: 4px;
}
.exam-problem .answer-block .a-lbl {
  font-size: 0.72rem; font-weight: 700; color: #6b4fc0; text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: 0.5rem; font-family: 'IBM Plex Mono', monospace;
}

.paper-toolbar {
  display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center;
  margin-top: 1.5rem; padding-top: 1.2rem;
}
.share-status {
  font-size: 0.8rem; color: var(--accent);
  font-family: 'IBM Plex Mono', monospace;
}

/* ── practice loop: Search Questions cards (see questionCard() in app.js) ── */
.q-card { flex-direction: column; gap: 0.75rem; }
.q-card[data-status="done"] { border-left: 3px solid var(--accent); }
.q-card[data-status="review"] { border-left: 3px solid var(--gold); }
.q-meta .q-source { margin-left: auto; }
.q-figure, .q-answer {
  background: #fff; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.q-figure img, .q-answer img { width: 100%; max-width: 640px; height: auto; display: block; margin: 0 auto; }
/* crops include the exam's blank workspace, so show the top of the question and let students expand it */
.q-figure { position: relative; max-height: 380px; }
.q-figure.expanded { max-height: none; }
.q-figure:not(.expanded)::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 60px;
  background: linear-gradient(transparent, #fff); pointer-events: none;
}
.q-expand {
  align-self: flex-start; background: none; border: 0; padding: 0; cursor: pointer;
  color: var(--accent); font: inherit; font-size: 0.8rem;
}
.q-answer { border-color: var(--gold); }
.q-actions { align-items: center; margin-top: 0; }
.q-link { font-size: 0.78rem; color: var(--muted); }
.q-link:hover { color: var(--accent); }
.prog-btn {
  background: none; border: 1px solid var(--border); color: var(--muted);
  border-radius: 6px; padding: 0.35rem 0.7rem; font: inherit; font-size: 0.8rem; cursor: pointer;
}
.prog-btn:hover { border-color: var(--accent); color: var(--text); }
.prog-btn.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.prog-btn.review.on { background: var(--gold); border-color: var(--gold); color: #1a1a1a; }
button.key-btn { font: inherit; cursor: pointer; }
.muted-btn { opacity: 0.55; }
.load-more { display: block; margin: 1rem auto; }
.q-progress-info { margin-left: 1rem; font-size: 0.8rem; color: var(--muted); }
.q-progress-info strong { color: var(--text); }
.skill-tag { font-size: 0.7rem; }

/* generator options + per-problem tools on a generated exam */
.gen-options { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; margin-top: 0.75rem; font-size: 0.82rem; color: var(--muted); }
.gen-options input { accent-color: var(--gold); }
.p-tools { display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; margin-top: 0.4rem; }

/* landing-view call to action pointing at the generator */
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-top: 1.25rem; }
.hero-cta .gen-btn { text-decoration: none; }
.hero-cta-note { flex-basis: 100%; font-size: 0.78rem; color: var(--muted); }

/* static course pages (courses/, built by scripts/build-pages.js) */
.seo-page { max-width: 900px; margin: 0 auto; padding-bottom: 3rem; }
.seo-page .hero-eyebrow a { color: inherit; }
.seo-section { padding: 0 2rem; margin-top: 2rem; }
.seo-section h2 { font-size: 1.1rem; margin-bottom: 0.6rem; }
.seo-list { margin: 0; padding-left: 1.2rem; line-height: 1.9; font-size: 0.9rem; }
.seo-list a { color: var(--accent); }
.seo-topics { display: block; font-size: 0.75rem; color: var(--muted); line-height: 1.4; margin-bottom: 0.3rem; }

/* ── syllabus awareness (see assets/js/syllabus.js) ── */
.icon-btn svg { display: block; }
.syllabus-status a { color: var(--accent); }
.syllabus-status .muted, .topic-offnote { color: var(--muted); }
.syl-warn { color: var(--gold); }
.tag.tag-off { opacity: 0.55; }
.topic-row.topic-off { opacity: 0.55; }
.p-report {
  margin-left: 0.5rem; padding: 0; border: 0; background: none;
  color: inherit; opacity: 0.6; font: inherit; text-decoration: underline; cursor: pointer;
}
.p-report:hover { opacity: 1; }
.p-report:disabled { text-decoration: none; cursor: default; }

@media print {
  .p-report, .p-tools { display: none !important; }
  header, .view-nav, .gen-card, .paper-toolbar, footer, .hero { display: none !important; }
  .exam-paper { box-shadow: none; margin: 0; padding: 0; border-radius: 0; }
  body { background: #fff; }
  .answer-block { display: var(--print-answers, block); }
}

@media (max-width: 600px) {
  header { padding: 0 1rem; }
  .hero, .search-wrap, .filters-wrap, .results-info, .cards-wrap, .submit-banner { padding-left: 1rem; padding-right: 1rem; }
  .card { flex-direction: column; }
  .card-right { flex-direction: row; align-items: center; justify-content: space-between; width: 100%; }
  footer { padding: 1.5rem 1rem; flex-direction: column; align-items: flex-start; }
  .view-nav, .gen-wrap { padding-left: 1rem; padding-right: 1rem; }
  .exam-paper { padding: 1rem 0.6rem; }      /* problem images get nearly the full screen width */
  .exam-problem .p-head, .exam-problem .p-src { padding: 0 0.4rem; }
  .hero-cta .gen-btn, .gen-wrap .gen-btn, .gen-wrap select { width: 100%; justify-content: center; text-align: center; }
  /* every tab visible as a two-column grid instead of a strip that hides some off-screen; an odd last tab spans both columns */
  .view-nav { display: grid; grid-template-columns: 1fr 1fr; overflow: visible; }
  .view-tab:last-child:nth-child(odd) { grid-column: span 2; }
  .variant-card { padding: 1rem; }
  .view-tab { padding: 0.6rem 0.5rem; font-size: 0.78rem; white-space: normal; text-align: center; }
  /* long instructor lists (common finals) wrap instead of pushing the buttons off-screen */
  .card-left { width: 100%; min-width: 0; }
  .card-right { flex-wrap: wrap; gap: 0.5rem; }
  .quarter-label { white-space: normal; }
  select { max-width: 100%; }
}

/* ── New Problems tab (assets/js/variants.js) ── */
#viewNew .filters-wrap .gen-btn { padding: 0.5rem 1rem; }
.variant-card { display: flex; flex-direction: column; gap: 0.75rem; cursor: default; }
.variant-card:hover { background: var(--surface); }
.variant-tag { font-size: 0.7rem; padding: 0.15rem 0.5rem; border: 1px dashed var(--gold); color: var(--gold); border-radius: 999px; }
.variant-card .q-source a { color: var(--accent); }
.variant-title { font-size: 1rem; font-weight: 600; margin: 0; }
.variant-body, .variant-answer, .variant-solution { line-height: 1.7; font-size: 0.95rem; min-width: 0; }
.variant-body p, .variant-answer p, .variant-solution p { margin: 0.4rem 0; }
.variant-answer, .variant-solution { border-top: 1px solid var(--border); padding-top: 0.75rem; }
.variant-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 0.3rem; }
/* wide matrices and long row-reduction chains scroll sideways instead of overflowing the page */
.variant-card .katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.25rem 0; }
.variant-card .katex { font-size: 1.05em; }
.variant-table { border-collapse: collapse; margin: 0.5rem 0; font-size: 0.85rem; }
.variant-table th, .variant-table td { border: 1px solid var(--border); padding: 0.3rem 0.6rem; text-align: center; }
.variant-table th { color: var(--muted); font-weight: 500; }
.variant-solution ul { margin: 0.3rem 0; padding-left: 1.2rem; }