/* ---------- theme tokens (light default, dark override) ---------- */
:root {
  --bg: #eef3f2; --panel: #ffffff; --panel2: #f4f8f7; --line: #d9e2e0;
  --ink: #12302e; --muted: #5c726f; --teal: #0e7c7b; --teal-l: #14a3a1;
  --err: #c0392b; --ok: #1a8f4c; --warn: #b9770a;
  --shadow: 0 1px 3px rgba(18,48,46,.08), 0 6px 20px rgba(18,48,46,.06);
  --radius: 12px;
}
:root[data-theme="dark"] {
  --bg: #0f1720; --panel: #17222e; --panel2: #1e2b39; --line: #2b3a4a;
  --ink: #e7eef4; --muted: #9fb0c0; --teal: #14a3a1; --teal-l: #1cc3c0;
  --err: #ff6b6b; --ok: #4ade80; --warn: #fbbf24;
  --shadow: 0 1px 3px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 13px; }
.err { color: var(--err); font-size: 13px; min-height: 18px; margin-top: 8px; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; border-bottom: 1px solid var(--line); background: var(--panel);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; letter-spacing: .2px; }
.brand span { color: var(--teal-l); }
.top-right { display: flex; align-items: center; gap: 12px; }
.icon-btn {
  border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
  width: 34px; height: 34px; border-radius: 9px; cursor: pointer; font-size: 15px;
}
.icon-btn:hover { border-color: var(--teal); }
.user-chip { text-align: right; line-height: 1.15; }
.user-chip .uname { font-weight: 600; font-size: 14px; }
.user-chip .uphone { font-size: 12px; color: var(--muted); }

/* ---------- layout ---------- */
.center { min-height: 78vh; display: grid; place-items: center; padding: 20px; }
main { max-width: 940px; margin: 0 auto; padding: 20px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.login { width: min(420px, 92vw); }
.login h1 { margin: 0 0 6px; font-size: 20px; }

/* ---------- forms ---------- */
label { display: block; margin: 12px 0 4px; font-size: 13px; color: var(--muted); }
input, textarea, select {
  width: 100%; padding: 10px 12px; background: var(--panel2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 9px; font: inherit;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--teal); border-color: var(--teal); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-row { display: flex; align-items: center; gap: 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
  padding: 8px 13px; border-radius: 9px; font: inherit; line-height: 1.1;
}
.btn:hover { border-color: var(--teal); }
.btn.primary { background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600; }
.btn.primary:hover { background: var(--teal-l); }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--err); border-color: color-mix(in srgb, var(--err) 40%, var(--line)); }
.btn.danger:hover { border-color: var(--err); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn.block { width: 100%; justify-content: center; margin-top: 14px; }
.btn:disabled { opacity: .5; cursor: default; }
.btn.file { position: relative; overflow: hidden; }

/* ---------- rows / headings ---------- */
.rowbar { display: flex; align-items: center; justify-content: space-between; margin: 22px 0 10px; }
.rowbar h2, .rowbar h3 { margin: 0; }
h2 { font-size: 18px; } h3 { font-size: 15px; }

/* ---------- course cards ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 14px; }
.course-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; cursor: pointer; box-shadow: var(--shadow); }
.course-card:hover { border-color: var(--teal); }
.course-card .thumb { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: var(--panel2); display: block; }
.course-card .body { padding: 10px 12px; }
.course-card .title { font-weight: 600; }

/* ---------- editable blocks ---------- */
.block { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 14px 0; box-shadow: var(--shadow); }
.block-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 6px; }
.block-head h2, .block-head h3 { margin: 0; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin-top: 8px; font-size: 14px; }
.kv .k { color: var(--muted); }
.cover-row { display: flex; align-items: center; gap: 14px; margin: 8px 0; }
.cover { width: 150px; aspect-ratio: 16/9; object-fit: cover; border-radius: 9px; background: var(--panel2); border: 1px solid var(--line); }

.module { border-left: 3px solid var(--teal); }
.mhead { display: flex; gap: 14px; align-items: flex-start; }
.mcover { width: 120px; aspect-ratio: 16/9; object-fit: cover; border-radius: 9px; background: var(--panel2); border: 1px solid var(--line); }

.lesson { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; margin-top: 8px; background: var(--panel2); }
.lesson .linfo { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; min-width: 0; }
.lesson .lname { font-weight: 600; }
.lesson .lactions { display: flex; gap: 6px; flex-shrink: 0; flex-wrap: wrap; justify-content: flex-end; }

.badge { font-size: 11px; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.badge.preview { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 40%, var(--line)); }
.badge.ready { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.badge.processing { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, var(--line)); }
.badge.none { opacity: .7; }

.msg { color: var(--ok); font-size: 13px; }
.crumbs { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }

/* ---------- modal ---------- */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: grid; place-items: center; padding: 20px; z-index: 100; }
.modal-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); width: min(560px, 94vw); max-height: 90vh; overflow: auto; }
.modal-card.wide { width: min(880px, 96vw); }
.modal-title { padding: 16px 18px; font-weight: 700; border-bottom: 1px solid var(--line); }
.modal-body { padding: 18px; }
.modal-foot { padding: 12px 18px; border-top: 1px solid var(--line); display: flex; justify-content: flex-end; gap: 10px; }
.modal-card video { width: 100%; border-radius: 10px; background: #000; display: block; }

/* ---------- toast ---------- */
#toastRoot { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 8px; z-index: 200; }
.toast { background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 999px; font-size: 13px; box-shadow: var(--shadow); opacity: .96; }
.toast.err { background: var(--err); color: #fff; }

/* ---------- attachments ---------- */
.att { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px; margin-top: 8px; }
.att .aname { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.att .ameta { font-size: 12px; color: var(--muted); }
.spin { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--teal); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } }