/* Math Practice — clean, focused UI */
:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #1e2429;
  --ink-soft: #5c6670;
  --line: #e3e0d8;
  --accent: #0e6e64;
  --accent-soft: #e2f0ee;
  --accent-ink: #0a5049;
  --gold: #b98a1f;
  --danger: #b3403a;
  --danger-soft: #f8e9e8;
  --ok: #2c7a4b;
  --ok-soft: #e6f2ea;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(30, 36, 41, 0.07), 0 4px 16px rgba(30, 36, 41, 0.05);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Public Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3, h4 { font-family: "Space Grotesk", system-ui, sans-serif; line-height: 1.2; margin: 0; }

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .brand {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--accent-ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  background: none;
  padding: 0;
}
.topbar .brand .logo {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
}
.topbar nav { margin-left: auto; display: flex; gap: 8px; }
.navlink {
  border: none;
  background: none;
  font: inherit;
  font-weight: 600;
  color: var(--ink-soft);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
}
.navlink:hover { background: var(--accent-soft); color: var(--accent-ink); }
.navlink.active { background: var(--accent-soft); color: var(--accent-ink); }
.points-chip {
  border: 1px solid var(--line);
  background: #fdf5e3;
  color: var(--gold);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 99px;
  cursor: pointer;
  align-self: center;
}
.points-chip:hover { border-color: var(--gold); }

.wrap { max-width: 880px; margin: 0 auto; padding: 32px 20px 80px; }

.eyebrow {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.page-title { font-size: 30px; margin-bottom: 6px; }
.page-sub { color: var(--ink-soft); margin: 0 0 28px; max-width: 60ch; }

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

.concept-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.concept-card { display: flex; flex-direction: column; gap: 10px; }
.concept-card h3 { font-size: 19px; }
.concept-card p { margin: 0; color: var(--ink-soft); font-size: 14.5px; flex: 1; }
.concept-card.locked { opacity: 0.55; }
.badge-soon {
  align-self: flex-start;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 99px;
}
.progress-pill {
  align-self: flex-start;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 99px;
}

/* Level list */
.level-list { display: flex; flex-direction: column; gap: 12px; }
.level-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.level-row .lv-num {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  flex-shrink: 0;
}
.level-row.locked .lv-num { background: var(--bg); color: var(--ink-soft); }
.level-row .lv-info { flex: 1; min-width: 160px; }
.level-row .lv-info h3 { font-size: 16.5px; }
.level-row .lv-info .lv-status { font-size: 13px; color: var(--ink-soft); }
.level-row .lv-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.level-row.locked { opacity: 0.6; }
.lock-note { font-size: 13px; color: var(--ink-soft); font-style: italic; }

/* Buttons */
.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 9px;
  padding: 9px 18px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  min-height: 44px;
}
.btn:hover { border-color: var(--accent); color: var(--accent-ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); }
.btn.subtle { border: none; background: var(--accent-soft); color: var(--accent-ink); }
.btn.subtle:hover { background: #d2e7e4; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.small { padding: 6px 14px; min-height: 38px; font-size: 14px; }

/* Study guide */
.study-body h3 { font-size: 18px; margin: 26px 0 8px; color: var(--accent-ink); }
.study-body h3:first-child { margin-top: 0; }
.study-body p { margin: 0 0 10px; }
.example {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 12px 0;
  font-size: 15.5px;
}
.example .ex-label {
  display: block;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}
.study-footer { display: flex; gap: 10px; margin-top: 28px; flex-wrap: wrap; }

/* Quiz */
.quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.quiz-meta { font-size: 14px; color: var(--ink-soft); font-weight: 600; }
.qbar { height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 26px; }
.qbar > div { height: 100%; background: var(--accent); border-radius: 99px; transition: width 0.25s ease; }

.q-prompt { font-size: 20px; margin-bottom: 24px; }
.choices { display: flex; flex-direction: column; gap: 10px; }
.choice {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  font: inherit;
  font-size: 16.5px;
  padding: 14px 16px;
  min-height: 52px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  background: var(--surface);
  cursor: pointer;
}
.choice:hover { border-color: var(--accent); }
.choice.selected { border-color: var(--accent); background: var(--accent-soft); }
.choice.correct { border-color: var(--ok); background: var(--ok-soft); }
.choice.wrong { border-color: var(--danger); background: var(--danger-soft); }
.choice .key {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: var(--bg);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.choice.selected .key { background: var(--accent); border-color: var(--accent); color: #fff; }

.numeric-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.numeric-input {
  font: inherit;
  font-size: 18px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  width: 220px;
  min-height: 52px;
}
.numeric-input:focus { outline: none; border-color: var(--accent); }
.input-note { font-size: 13px; color: var(--ink-soft); margin-top: 8px; }

.quiz-actions { display: flex; gap: 10px; margin-top: 26px; align-items: center; flex-wrap: wrap; }

.hint-box, .feedback-box {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 15.5px;
}
.hint-box { background: #fdf5e3; border: 1px solid #ecd9a8; }
.hint-box .label, .feedback-box .label {
  display: block;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.hint-box .label { color: var(--gold); }
.feedback-box.good { background: var(--ok-soft); border: 1px solid #b9dcc6; }
.feedback-box.good .label { color: var(--ok); }
.feedback-box.bad { background: var(--danger-soft); border: 1px solid #ecc4c1; }
.feedback-box.bad .label { color: var(--danger); }

/* Results */
.score-hero { text-align: center; padding: 34px 22px; }
.score-hero .big {
  font-family: "Space Grotesk", sans-serif;
  font-size: 56px;
  font-weight: 700;
  color: var(--accent-ink);
  line-height: 1;
}
.score-hero .verdict { font-size: 17px; font-weight: 600; margin-top: 10px; }
.score-hero .verdict.pass { color: var(--ok); }
.score-hero .verdict.fail { color: var(--ink-soft); }
.stat-row { display: flex; justify-content: center; gap: 34px; margin-top: 20px; flex-wrap: wrap; }
.stat-row .stat { text-align: center; }
.stat-row .stat .v { font-family: "Space Grotesk", sans-serif; font-size: 21px; font-weight: 700; }
.stat-row .stat .k { font-size: 12.5px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; }

.review-item { padding: 18px 0; border-top: 1px solid var(--line); }
.review-item .ri-head { display: flex; gap: 10px; align-items: baseline; }
.ri-mark { font-weight: 700; flex-shrink: 0; }
.ri-mark.good { color: var(--ok); }
.ri-mark.bad { color: var(--danger); }
.ri-prompt { font-weight: 600; }
.ri-detail { margin: 8px 0 0 26px; font-size: 15px; color: var(--ink-soft); }
.ri-detail .expl { margin-top: 6px; color: var(--ink); }
.ri-time { font-size: 12.5px; color: var(--ink-soft); margin-left: auto; flex-shrink: 0; }

/* Dashboard */
.dash-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); margin-bottom: 24px; }
.dash-stat { text-align: center; padding: 18px 12px; }
.dash-stat .v { font-family: "Space Grotesk", sans-serif; font-size: 28px; font-weight: 700; color: var(--accent-ink); }
.dash-stat .k { font-size: 12.5px; color: var(--ink-soft); font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; margin-top: 2px; }

table.dash { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.dash th {
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  padding: 8px 10px;
  border-bottom: 2px solid var(--line);
}
table.dash td { padding: 10px; border-bottom: 1px solid var(--line); }
table.dash tr:last-child td { border-bottom: none; }
.tag { font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 99px; }
.tag.quiz { background: var(--accent-soft); color: var(--accent-ink); }
.tag.practice { background: #f0ecfa; color: #5b4a9e; }
.tag.pass { background: var(--ok-soft); color: var(--ok); }
.tag.fail { background: var(--bg); color: var(--ink-soft); }

.mini-bars { display: flex; flex-direction: column; gap: 10px; }
.mini-bar { display: grid; grid-template-columns: 130px 1fr 110px; gap: 12px; align-items: center; font-size: 14px; }
.mini-bar .track { height: 10px; background: var(--bg); border: 1px solid var(--line); border-radius: 99px; overflow: hidden; }
.mini-bar .fill { height: 100%; background: var(--accent); border-radius: 99px; }
.mini-bar .val { color: var(--ink-soft); font-size: 13px; text-align: right; }

.empty-note { color: var(--ink-soft); font-style: italic; padding: 12px 0; }

/* Rewards */
.points-earned { margin-top: 12px; font-weight: 600; color: var(--gold); }
.points-earned.muted { color: var(--ink-soft); font-weight: 400; font-size: 14px; }
.points-earned a { color: var(--accent-ink); }
.points-banner {
  display: flex;
  gap: 40px;
  align-items: center;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.points-banner .pb-value { font-family: "Space Grotesk", sans-serif; font-size: 30px; font-weight: 700; color: var(--accent-ink); }
.points-banner .pb-label { font-size: 12.5px; color: var(--ink-soft); font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; }
.fact-list { display: flex; flex-direction: column; gap: 14px; }
.fact-card p { margin: 10px 0 12px; }
.fact-card.locked { background: var(--bg); }
.fact-card.locked .fact-teaser { color: var(--ink-soft); font-style: italic; }
.fact-head { display: flex; align-items: center; gap: 12px; }
.fact-head h3 { font-size: 17px; }
.fact-num {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}
.fact-card.locked .fact-num { background: var(--surface); border: 1px solid var(--line); color: var(--ink-soft); }
.fact-link { color: var(--accent-ink); font-weight: 600; font-size: 14.5px; }
.section-title { font-size: 19px; margin: 32px 0 14px; }
.danger-link { background: none; border: none; font: inherit; font-size: 13px; color: var(--danger); cursor: pointer; text-decoration: underline; padding: 0; }

.back-link {
  background: none; border: none; font: inherit;
  color: var(--ink-soft); font-weight: 600; cursor: pointer;
  padding: 0; margin-bottom: 18px; display: inline-flex; align-items: center; gap: 6px;
}
.back-link:hover { color: var(--accent-ink); }

@media (max-width: 560px) {
  .wrap { padding: 22px 14px 60px; }
  .page-title { font-size: 24px; }
  .q-prompt { font-size: 18px; }
  .mini-bar { grid-template-columns: 100px 1fr 90px; }
  .topbar { padding: 12px 14px; }
}