:root {
  --navy: #0E2C45;
  --navy-ink: #1C2B30;
  --text-body: #46565A;
  --text-soft: #5F747C;
  --bg: #FFFFFF;
  --bg-soft: #F3F5F6;
  --card: #FFFFFF;
  --border: #DBE1E3;
  --gold: #E0701C;
  --gold-dark: #C45E12;
  --gold-soft: #FCEADB;
  --teal: #0E8A86;
  --teal-dark: #0B6F6C;
  --teal-soft: #D6EFEE;
  --danger: #D6485A;
  --success: #2A9D6F;
}
@media (prefers-color-scheme: dark) {
  :root {
    --navy-ink: #EDF1F2;
    --text-body: #C4CDD1;
    --text-soft: #93A2A8;
    --bg: #101A1F;
    --bg-soft: #17232A;
    --card: #1B282F;
    --border: #2C3B41;
    --gold-soft: #3A2C1C;
    --teal-soft: #163331;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-soft);
  color: var(--text-body);
  line-height: 1.5;
}
a { color: var(--gold-dark); }
.app-shell { max-width: 880px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }
.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.25rem; background: var(--navy); color: #fff;
}
.app-header a.brand { color: #fff; text-decoration: none; font-weight: 700; }
.app-header button {
  background: transparent; border: 1px solid rgba(255,255,255,.4); color: #fff;
  padding: .45rem .9rem; border-radius: 8px; cursor: pointer; font-size: .85rem;
}
h1, h2, h3 { color: var(--navy-ink); margin: 0 0 .5rem; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 1.25rem; margin-bottom: 1rem;
}
.field { margin-bottom: 1rem; }
.field label { display: block; font-size: .8rem; font-weight: 600; color: var(--navy-ink); margin-bottom: .35rem; }
.field input, .field textarea, .field select {
  width: 100%; padding: .65rem .8rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text-body); font-size: .95rem; font-family: inherit;
}
.field textarea { min-height: 140px; resize: vertical; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .7rem 1.3rem; border-radius: 10px; border: none; cursor: pointer;
  font-weight: 600; font-size: .92rem; background: var(--gold); color: #fff;
}
.btn:hover { background: var(--gold-dark); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn-outline { background: transparent; border: 1px solid var(--gold); color: var(--gold-dark); }
.msg-error { color: var(--danger); font-size: .85rem; margin-top: .6rem; }
.msg-success { color: var(--success); font-size: .85rem; margin-top: .6rem; }
.module-row, .assignment-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: .7rem 0; border-top: 1px solid var(--border);
}
.module-row:first-child, .assignment-row:first-child { border-top: none; padding-top: 0; }
.badge {
  font-size: .72rem; font-weight: 700; padding: .25rem .6rem; border-radius: 999px;
  background: var(--gold-soft); color: var(--gold-dark); white-space: nowrap;
}
.badge.done { background: #E3F4EC; color: var(--success); }
.badge.pending { background: var(--border); color: var(--text-soft); }
.quiz-question { padding: 1rem 0; border-top: 1px solid var(--border); }
.quiz-question:first-child { border-top: none; }
.quiz-question .opt { display: flex; align-items: center; gap: .5rem; padding: .3rem 0; }