:root {
  color-scheme: light;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #e4e7ec;
  --primary: #991b1b;
  --primary-dark: #7f1d1d;
  --primary-soft: #fee2e2;
  --success: #166534;
  --danger: #b42318;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

button, input, select, textarea { -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(153, 27, 27, 0.14), transparent 32rem),
    var(--bg);
  color: var(--text);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 4vw, 3rem);
}

h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin-bottom: 0; }
h2 { font-size: clamp(1.35rem, 3vw, 2rem); margin-bottom: .75rem; }

.layout {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto 3rem;
}

.card {
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(228, 231, 236, .9);
  border-radius: 1.5rem;
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 1.75rem);
  backdrop-filter: blur(10px);
}

.narrow { max-width: 440px; margin: 8vh auto 0; }
.dashboard-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 1rem; }
.wide { grid-column: 1 / -1; }
.hero-card { background: linear-gradient(135deg, #fff, #fff7f7); }
.quiz-card { max-width: 860px; margin: 3vh auto 0; }

.form { display: grid; gap: 1rem; }
label { display: grid; gap: .45rem; font-weight: 700; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: .9rem;
  padding: .8rem .9rem;
  font: inherit;
  background: #fff;
  color: var(--text);
}
textarea { min-height: 9rem; resize: vertical; }

.button {
  border: 0;
  border-radius: 999px;
  min-height: 44px;
  padding: .78rem 1.05rem;
  font-weight: 800;
  cursor: pointer;
  font: inherit;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
}
.button:hover { transform: translateY(-1px); }
.button:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.primary { background: var(--primary); color: #fff; box-shadow: 0 12px 26px rgba(153, 27, 27, .24); }
.secondary { background: #eef2ff; color: #3730a3; }
.success { background: #dcfce7; color: var(--success); }
.danger { background: #fee2e2; color: var(--danger); }
.ghost { background: rgba(255,255,255,.72); color: var(--text); border: 1px solid var(--line); }
.button-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1rem; }

.eyebrow { color: var(--primary); font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 900; margin-bottom: .45rem; }
.muted { color: var(--muted); line-height: 1.55; }
.error { color: var(--danger); font-weight: 700; }
.hidden { display: none !important; }

.progress-wrap { display: flex; align-items: center; gap: 1rem; margin: 1.25rem 0; }
.progress-bar { flex: 1; height: .9rem; background: #f2f4f7; border-radius: 999px; overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--primary); border-radius: inherit; transition: width .25s ease; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .75rem; }
.stats-grid div { background: #fff; border: 1px solid var(--line); border-radius: 1rem; padding: .85rem; }
.stats-grid strong { display: block; font-size: 1.35rem; }
.stats-grid span { color: var(--muted); font-size: .9rem; }

.topic-list { display: grid; gap: .75rem; }
.topic-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: .9rem;
  background: #fff;
}
.topic-row strong { display: block; }
.topic-row span { color: var(--muted); font-size: .9rem; }

.quiz-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.pill { display: inline-flex; align-items: center; border-radius: 999px; padding: .4rem .7rem; background: var(--primary-soft); color: var(--primary-dark); font-weight: 800; }
.answer-box { white-space: pre-wrap; line-height: 1.6; padding: 1rem; border-radius: 1rem; background: #f8fafc; border: 1px solid var(--line); margin-top: 1rem; }

.install-card { align-self: start; }
.install-help {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #f8fafc;
}
.install-help h3 { margin-bottom: .4rem; }
.install-help ol { margin: 0; padding-left: 1.25rem; color: var(--muted); line-height: 1.55; }
.install-help strong { color: var(--text); }

@media (max-width: 780px) {
  .dashboard-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .app-header { align-items: flex-start; }
  .install-help { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .app-header {
    flex-direction: column;
    padding-top: calc(1rem + env(safe-area-inset-top));
  }

  .layout {
    width: min(100% - 1rem, 1120px);
    margin-bottom: 1.5rem;
  }

  .card { border-radius: 1.15rem; }
  .narrow { margin-top: 2vh; }
  .button-row { display: grid; grid-template-columns: 1fr; }
  .button { width: 100%; }
  .topic-row { grid-template-columns: 1fr; }
  .topic-row .button { justify-self: stretch; }
  .quiz-topline { align-items: stretch; flex-direction: column; }
  #questionText { font-size: 1.25rem; line-height: 1.35; }
  .answer-box { font-size: 1rem; overflow-wrap: anywhere; }
}

.notice {
  margin-top: 1rem;
  padding: .85rem 1rem;
  border-radius: 1rem;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  font-weight: 700;
  line-height: 1.45;
}

.feedback {
  margin-bottom: 0;
  font-weight: 800;
}

.feedback.success { color: var(--success); }
.feedback.error { color: var(--danger); }