:root {
  --surface-1: #fcfcfb;
  --page: #f9f9f7;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11,11,11,0.10);
  --accent: #4a3aa7;
  --accent-ink: #ffffff;
  --good: #0ca30c;
  --warning: #fab219;
  --critical: #d03b3b;
  --good-text: #006300;
}
@media (prefers-color-scheme: dark) {
  :root {
    --surface-1: #1a1a19;
    --page: #0d0d0d;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255,255,255,0.10);
    --accent: #7a6ce0;
    --good-text: #0ca30c;
  }
}

* { box-sizing: border-box; margin: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card {
  background: var(--surface-1); border: 1px solid var(--border); border-radius: 14px;
  padding: 32px; width: 100%; max-width: 380px; box-shadow: 0 8px 30px rgba(0,0,0,.06);
}
.login-sub { color: var(--ink-2); margin: 6px 0 20px; }
.logo { font-weight: 700; font-size: 18px; }
.logo span { color: var(--accent); }

/* ---------- app shell ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; flex-shrink: 0; background: var(--surface-1); border-right: 1px solid var(--grid);
  padding: 20px 12px; display: flex; flex-direction: column; gap: 20px;
  position: sticky; top: 0; height: 100vh;
}
.sidebar nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-item {
  text-align: left; background: none; border: none; padding: 10px 12px; border-radius: 8px;
  font-size: 15px; color: var(--ink-2); cursor: pointer; font-family: inherit;
}
.nav-item:hover { background: var(--page); }
.nav-item.active { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.sidebar-footer { border-top: 1px solid var(--grid); padding-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.me { display: flex; flex-direction: column; }
.me small { color: var(--muted); text-transform: capitalize; }

.main { flex: 1; padding: 28px 32px; max-width: 980px; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin: 8px 0 18px; gap: 12px; flex-wrap: wrap; }
h1 { font-size: 24px; }
h2 { font-size: 16px; margin-bottom: 12px; }

/* ---------- controls ---------- */
.btn {
  font-family: inherit; font-size: 14px; border-radius: 8px; padding: 9px 16px;
  border: 1px solid var(--border); background: var(--surface-1); color: var(--ink);
  cursor: pointer; text-decoration: none; display: inline-block;
}
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; }
.btn-ghost:hover { background: var(--grid); }
.btn-danger { background: transparent; border-color: var(--critical); color: var(--critical); }
.btn-sm { padding: 6px 11px; font-size: 13px; }
.btn-block { width: 100%; }

label { display: block; margin-bottom: 12px; font-size: 13px; color: var(--ink-2); font-weight: 600; }
input, select, textarea {
  width: 100%; margin-top: 5px; padding: 9px 11px; font-family: inherit; font-size: 14px;
  border: 1px solid var(--baseline); border-radius: 8px; background: var(--surface-1); color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-error { color: var(--critical); font-size: 13px; margin-bottom: 10px; }

.card { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin-bottom: 18px; }
.table-scroll { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th { text-align: left; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; padding: 8px 10px; border-bottom: 1px solid var(--grid); }
.table td { padding: 10px; border-bottom: 1px solid var(--grid); }
.table tr:last-child td { border-bottom: none; }

.pill { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 99px; white-space: nowrap; }
.pill-good { background: color-mix(in srgb, var(--good) 15%, transparent); color: var(--ink); border: 1px solid var(--good); }
.pill-neutral { background: var(--grid); color: var(--ink-2); }
.pill-accent { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--ink); border: 1px solid var(--accent); }

.empty { color: var(--muted); text-align: center; padding: 40px 0; }

/* ---------- learner: course cards ---------- */
.course-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.ccard {
  background: var(--surface-1); border: 1px solid var(--border); border-radius: 14px; padding: 20px;
  cursor: pointer; display: flex; flex-direction: column; gap: 10px; transition: border-color .15s;
}
.ccard:hover { border-color: var(--accent); }
.ccard-emoji { font-size: 30px; }
.ccard-title { font-weight: 700; font-size: 16px; }
.ccard-desc { color: var(--ink-2); font-size: 13.5px; flex: 1; }
.progress-track { height: 8px; background: var(--grid); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s; }
.progress-fill.done { background: var(--good); }
.progress-label { font-size: 12.5px; color: var(--muted); }

/* ---------- learner: course/module view ---------- */
.course-head { margin: 14px 0 20px; }
.course-head h1 { margin-bottom: 4px; }
.course-head #c-progress { margin-top: 12px; max-width: 420px; display: flex; flex-direction: column; gap: 5px; }
.module-list { display: flex; flex-direction: column; gap: 12px; }
.mcard { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; }
.mcard-head { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
.mcard-num {
  width: 28px; height: 28px; border-radius: 99px; background: var(--grid); color: var(--ink-2);
  display: inline-flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0;
}
.mcard.complete .mcard-num { background: var(--good); color: #fff; }
.mcard-items { margin-top: 10px; display: flex; flex-direction: column; gap: 2px; }
.mitem {
  display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px;
  cursor: pointer; font-size: 14px; color: var(--ink-2); background: none; border: none;
  font-family: inherit; text-align: left; width: 100%;
}
.mitem:hover { background: var(--page); }
.mitem .check { width: 18px; flex-shrink: 0; text-align: center; }
.mitem .done-check { color: var(--good); font-weight: 700; }
.mitem .badge { margin-left: auto; font-size: 12px; color: var(--muted); }

/* ---------- learner: lesson content ---------- */
.lesson { max-width: 720px; margin-top: 14px; }
.lesson h1 { margin-bottom: 18px; }
.lesson-content { display: flex; flex-direction: column; gap: 16px; }
.lb-heading { font-size: 18px; font-weight: 700; margin-top: 10px; }
.lb-text { color: var(--ink-2); white-space: pre-wrap; }
.lb-text strong { color: var(--ink); }
.lb-callout {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0;
  padding: 12px 16px; color: var(--ink-2); white-space: pre-wrap;
}
.lb-media { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--surface-1); }
.lb-media img, .lb-media video { display: block; width: 100%; height: auto; }
.lb-caption { font-size: 12.5px; color: var(--muted); padding: 8px 12px; border-top: 1px solid var(--grid); }
.lesson-nav { margin-top: 26px; display: flex; justify-content: flex-end; }

/* ---------- learner: quiz ---------- */
.quiz-q { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; margin-bottom: 12px; }
.quiz-q h3 { font-size: 15px; margin-bottom: 10px; }
.quiz-opt { display: flex; align-items: flex-start; gap: 10px; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-weight: 400; margin-bottom: 2px; }
.quiz-opt:hover { background: var(--page); }
.quiz-opt input { width: auto; margin: 3px 0 0; }
.quiz-q.right { border-color: var(--good); }
.quiz-q.wrong { border-color: var(--critical); }
.quiz-explain { margin-top: 8px; font-size: 13px; color: var(--muted); }
.quiz-score { text-align: center; padding: 24px; border-radius: 14px; margin-bottom: 16px; background: var(--surface-1); border: 1px solid var(--border); }
.quiz-score .big { font-size: 40px; font-weight: 800; }

/* ---------- learner: practice ---------- */
.pstep {
  display: flex; align-items: flex-start; gap: 12px; padding: 14px 16px;
  background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; margin-bottom: 8px;
}
.pstep .pcheck { font-size: 20px; width: 26px; text-align: center; flex-shrink: 0; }
.pstep.done { border-color: var(--good); }
.pstep .pdesc { flex: 1; }
.pstep .ptype { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- admin: builder ---------- */
.bcourse { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; margin-bottom: 14px; }
.bcourse-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.bcourse-head .t { font-weight: 700; font-size: 16px; flex: 1; }
.bmodule { border-top: 1px solid var(--grid); padding: 12px 0 4px; margin-top: 12px; }
.bmodule-head { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; flex-wrap: wrap; }
.bmodule-head .t { flex: 1; }
.blesson { display: flex; align-items: center; gap: 8px; padding: 5px 0 5px 24px; font-size: 13.5px; color: var(--ink-2); }
.blesson .t { flex: 1; }
.icon-btn { background: none; border: none; cursor: pointer; font-size: 13px; color: var(--muted); padding: 3px 6px; border-radius: 6px; font-family: inherit; }
.icon-btn:hover { background: var(--grid); color: var(--ink); }
.badd { margin: 8px 0 0 24px; }

/* ---------- admin: lesson editor ---------- */
.ed-blocks { display: flex; flex-direction: column; gap: 10px; max-width: 760px; }
.ed-block { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.ed-block-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.ed-block-head .spacer { flex: 1; }
.ed-block textarea { min-height: 70px; }
.ed-block img, .ed-block video { max-width: 100%; border-radius: 8px; margin-top: 8px; }
.ed-add { margin-top: 14px; display: flex; gap: 8px; align-items: center; color: var(--muted); font-size: 13px; flex-wrap: wrap; }

/* ---------- admin: quiz/steps editors ---------- */
.qe-item, .se-item { border: 1px solid var(--grid); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.qe-opt { display: flex; gap: 8px; align-items: center; margin-bottom: 6px; }
.qe-opt input[type="checkbox"] { width: auto; margin: 0; }
.qe-opt input[type="text"] { margin: 0; }
.assign-list { display: flex; flex-direction: column; gap: 4px; max-height: 320px; overflow-y: auto; }
.assign-list label { display: flex; gap: 10px; align-items: center; font-weight: 400; padding: 8px 10px; border-radius: 8px; margin: 0; }
.assign-list label:hover { background: var(--page); }
.assign-list input { width: auto; margin: 0; }

/* ---------- admin: dashboard ---------- */
.dash-user { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin-bottom: 12px; }
.dash-user-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.dash-user-head .n { font-weight: 700; }
.dash-course { display: grid; grid-template-columns: 1fr 160px auto; gap: 12px; align-items: center; padding: 8px 0; border-top: 1px solid var(--grid); font-size: 14px; }
.dash-course .quiz-note { color: var(--muted); font-size: 12.5px; }

/* ---------- modals / misc ---------- */
.backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex;
  align-items: flex-start; justify-content: center; padding: 6vh 16px; z-index: 50; overflow-y: auto;
}
.modal {
  background: var(--surface-1); border-radius: 14px; padding: 24px; width: 100%; max-width: 440px;
  border: 1px solid var(--border); box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.modal-wide { max-width: 640px; }
.modal h2 { margin-bottom: 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 14px; }
.temp-pass {
  font-family: ui-monospace, monospace; font-size: 22px; letter-spacing: 2px; text-align: center;
  background: var(--page); border: 1px dashed var(--baseline); border-radius: 10px;
  padding: 14px; margin: 14px 0; user-select: all;
}
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--page); padding: 10px 20px; border-radius: 99px;
  font-size: 14px; z-index: 99; box-shadow: 0 6px 20px rgba(0,0,0,.25);
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; padding: 10px 14px; overflow-x: auto; }
  .sidebar nav { flex-direction: row; }
  .sidebar .logo { display: none; }
  .sidebar-footer { border: none; padding: 0; flex-direction: row; align-items: center; margin-left: auto; }
  .me small { display: none; }
  .main { padding: 18px 14px; }
  .dash-course { grid-template-columns: 1fr; gap: 4px; }
}