:root {
  --bg: #0f1216;
  --panel: #1a1f27;
  --panel2: #222933;
  --text: #e6e9ee;
  --muted: #8b95a3;
  --accent: #4f9cf9;
  --accent2: #2d6fd6;
  --border: #2a313c;
  --ok: #3ec46d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
button { cursor: pointer; font: inherit; }
input, select, button { font: inherit; }

/* login */
.login-body { display: flex; min-height: 100vh; align-items: center; justify-content: center; }
.login-card {
  background: var(--panel); padding: 32px; border-radius: 14px; width: 320px;
  border: 1px solid var(--border); display: flex; flex-direction: column; gap: 14px;
}
.login-card h1 { margin: 0 0 8px; font-size: 20px; text-align: center; }
.login-card input, .login-card button {
  padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel2); color: var(--text);
}
.login-card button { background: var(--accent2); border: none; font-weight: 600; }
.error { color: #ff6b6b; margin: 0; text-align: center; font-size: 14px; }

/* topbar */
.topbar {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { color: var(--text); text-decoration: none; font-weight: 700; }
.spacer { flex: 1; }
.logout button { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px; }

.view { max-width: 860px; margin: 0 auto; padding: 16px; }

/* filters */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.filters input, .filters select {
  padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel2); color: var(--text);
}
.filters #search { flex: 1; min-width: 180px; }
.ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; }

/* list */
.list { display: flex; flex-direction: column; gap: 10px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 16px; cursor: pointer; transition: border-color .15s;
}
.card:hover { border-color: var(--accent); }
.card .row1 { display: flex; align-items: center; gap: 10px; }
.card .course { font-weight: 600; }
.card .when { color: var(--muted); font-size: 13px; }
.card .snippet { color: var(--muted); margin-top: 6px; font-size: 14px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tag { background: var(--panel2); color: var(--muted); border-radius: 6px; padding: 2px 8px; font-size: 12px; }
.tag.small { font-size: 11px; }
.empty { color: var(--muted); text-align: center; padding: 40px; }

/* detail */
.back { margin-bottom: 12px; }
.detail-head h2 { margin: 0 0 6px; font-size: 18px; }
.meta { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-bottom: 12px; }
.course-edit { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.course-edit select { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel2); color: var(--text); }
#player { width: 100%; margin-bottom: 16px; }
.summary, .transcript { margin-top: 18px; }
.summary h3, .transcript h3 { font-size: 15px; margin: 0 0 10px; }

/* markdown rendered summary */
#d-summary { line-height: 1.7; font-size: 14px; }
#d-summary h1 { font-size: 18px; margin: 16px 0 8px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
#d-summary h2 { font-size: 16px; margin: 14px 0 6px; }
#d-summary h3 { font-size: 15px; margin: 12px 0 4px; }
#d-summary ul, #d-summary ol { padding-left: 20px; margin: 6px 0; }
#d-summary li { margin: 3px 0; }
#d-summary strong { color: var(--accent); }
#d-summary code { background: var(--panel2); padding: 1px 5px; border-radius: 4px; font-size: 13px; }
#d-summary blockquote { border-left: 3px solid var(--accent2); padding-left: 12px; color: var(--muted); margin: 8px 0; }
#d-summary p { margin: 6px 0; }
.hint { color: var(--muted); font-weight: 400; font-size: 12px; }
.words { line-height: 2; }
.words .w { cursor: pointer; padding: 0 1px; border-radius: 3px; }
.words .w:hover { background: var(--panel2); }
.words .w.active { background: var(--accent2); color: #fff; }