/* ===== Luau Lessons - shared stylesheet ===== */

:root {
  /* warm, low-contrast "comfy" palette */
  --bg:        #1c1a22;
  --bg-2:      #221f29;
  --panel:     #272430;
  --panel-2:   #2f2b3a;
  --border:    #3a3445;
  --text:      #ece6e0;       /* warm off-white */
  --muted:     #a39aae;
  --accent:    #c9a8ff;       /* soft lavender */
  --accent-2:  #e6d0ff;
  --accent-3:  #ffb89c;       /* peach */
  --good:      #9ee5a8;
  --warn:      #f5c977;
  --bad:       #f29191;
  --code-bg:   #1a1820;
  --code-fg:   #e0d8e8;
  --radius:    14px;
  --shadow:    0 6px 24px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(900px 600px at 15% -10%, #2a2434 0%, transparent 60%),
    radial-gradient(700px 500px at 110% 10%, #2b2533 0%, transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: "Iowan Old Style", "Source Serif Pro", Charter, Georgia, Cambria,
               "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- top bar ---- */
header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 26px;
  background: rgba(34, 31, 41, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
header.topbar .brand {
  font-weight: 600;
  letter-spacing: 0.3px;
  font-size: 18px;
  color: var(--text);
  font-family: "Iowan Old Style", Georgia, serif;
}
header.topbar nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
header.topbar nav a {
  margin-left: 6px;
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header.topbar nav a.active,
header.topbar nav a:hover {
  color: var(--text);
  background: var(--panel-2);
  text-decoration: none;
}
header.topbar .who {
  color: var(--muted);
  font-size: 13px;
  margin-left: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
header.topbar .who-avatar {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1px solid var(--border);
  object-fit: cover;
}
header.topbar button.linkish {
  background: none; border: none; color: var(--muted); cursor: pointer;
  font-size: 14px; margin-left: 6px; padding: 6px 10px; border-radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header.topbar button.linkish:hover { color: var(--text); background: var(--panel-2); }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 36px 24px 100px;
}

/* ---- cards / forms ---- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}

/* ---- discord-link rows on login / signup ---- */
.dv-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-2);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.dv-row--unlinked { border-style: dashed; }
.dv-row--linked {
  border-color: #3a4a30;
  background: rgba(154, 219, 160, 0.06);
}
.dv-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--muted);
  flex: none;
}
.dv-dot--ok { background: var(--good); box-shadow: 0 0 8px var(--good); }
.dv-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid var(--border); flex: none;
}
.dv-text  { flex: 1; min-width: 0; }
.dv-title { font-size: 14px; color: var(--text); font-weight: 500; }
.dv-sub   { font-size: 12px; color: var(--muted); margin-top: 1px;
            white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.auth-wrap {
  max-width: 440px;
  margin: 70px auto;
}
.auth-wrap h1 {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.2px;
}
.auth-wrap p.sub { color: var(--muted); margin: 0 0 22px; font-size: 15px; }

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  letter-spacing: 0.2px;
}
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  width: 100%;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 15px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: border-color 0.15s, background 0.15s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--panel);
}
textarea { resize: vertical; min-height: 120px; line-height: 1.55; }
textarea.code {
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  min-height: 280px;
  background: var(--code-bg);
  color: var(--code-fg);
}

button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  border: none;
  border-radius: 10px;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 18px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: transform 0.1s, filter 0.15s;
}
button.primary:hover { filter: brightness(1.06); }
button.primary:active { transform: translateY(1px); }
button.primary:disabled { opacity: 0.6; cursor: progress; }

button.secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
button.secondary:hover { background: var(--border); }

button.danger {
  background: transparent;
  color: var(--bad);
  border: 1px solid #5a2a2a;
  border-radius: 9px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
button.danger:hover { background: rgba(242, 145, 145, 0.08); }

.msg { margin-top: 14px; font-size: 14px; min-height: 18px;
       font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.msg.err  { color: var(--bad); }
.msg.ok   { color: var(--good); }
.muted { color: var(--muted); }

/* ---- lesson plan header ---- */
.plan-header { margin: 6px 0 26px; }
.plan-header h1 {
  margin: 0 0 6px;
  font-weight: 500;
  font-size: 30px;
  letter-spacing: 0.2px;
}
.plan-header p {
  color: var(--muted);
  margin: 0;
  font-size: 16px;
}

/* ---- lesson cards ---- */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.lesson-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  text-decoration: none !important;
  color: var(--text);
}
.lesson-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.lesson-card .num {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.lesson-card .title {
  font-weight: 500;
  font-size: 17px;
  color: var(--text);
}
.lesson-card .topics {
  font-size: 13.5px;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.lesson-card .row {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 10px;
}
.badge {
  font-size: 10.5px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: var(--bg-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.badge.level-Beginner     { color: #b9e5be; border-color: #2c4a33; }
.badge.level-Intermediate { color: #f5dba0; border-color: #4f4019; }
.badge.level-Advanced     { color: #f5b4a0; border-color: #4f2a1f; }
.badge.level-Master       { color: #d8c2ff; border-color: #3e2a5c; }
.badge.status-graded      { color: var(--good); border-color: #2b4d33; }
.badge.status-pending     { color: var(--warn); border-color: #4f4019; }

/* ---- lesson reader ---- */
.lesson-body {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 44px;
  box-shadow: var(--shadow);
}
.lesson-body h1 {
  margin-top: 0;
  font-weight: 500;
  letter-spacing: 0.2px;
  font-size: 30px;
}
.lesson-body h2 {
  margin-top: 36px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: 0.2px;
}
.lesson-body h3 {
  margin-top: 26px;
  color: var(--accent-2);
  font-weight: 500;
  font-size: 18px;
}
.lesson-body p { margin: 14px 0; }
.lesson-body code {
  background: var(--code-bg);
  padding: 1px 7px;
  border-radius: 5px;
  font-size: 0.9em;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}
.lesson-body pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 16px 18px;
  border-radius: 10px;
  overflow: auto;
  border: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.55;
}
.lesson-body pre code {
  background: none; padding: 0;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

/* ---- code block wrapper with copy + playground buttons ---- */
.codeblock {
  position: relative;
  margin: 14px 0;
}
.codeblock-actions {
  position: absolute;
  top: 8px; right: 8px;
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.15s;
}
.codeblock:hover .codeblock-actions { opacity: 1; }
.codeblock-actions button,
.codeblock-actions a {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 7px;
  padding: 4px 9px;
  font-size: 11.5px;
  cursor: pointer;
  text-decoration: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: inline-flex; align-items: center; gap: 4px;
  line-height: 1.2;
}
.codeblock-actions button:hover,
.codeblock-actions a:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent);
}
.codeblock-actions .copied { color: var(--good); }

/* Syntax highlight tokens (used by lua-highlight.js) */
.lesson-body pre code .t-kw,
pre code .t-kw  { color: #ff8ec0; font-weight: 500; }   /* keywords */
.lesson-body pre code .t-bi,
pre code .t-bi  { color: #8ecbff; }                     /* builtins */
.lesson-body pre code .t-typ,
pre code .t-typ { color: #ffd28a; }                     /* type names */
.lesson-body pre code .t-cls,
pre code .t-cls { color: #ffcf85; }                     /* PascalCase ids */
.lesson-body pre code .t-fn,
pre code .t-fn  { color: #a8e6ff; }                     /* function names */
.lesson-body pre code .t-str,
pre code .t-str { color: #c3e88d; }                     /* strings */
.lesson-body pre code .t-num,
pre code .t-num { color: #f78c6c; }                     /* numbers */
.lesson-body pre code .t-com,
pre code .t-com { color: #6f7d99; font-style: italic; } /* comments */
.lesson-body pre code .t-op,
pre code .t-op  { color: #d6deeb; }                     /* operators */
.lesson-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 18px 0;
  padding: 10px 18px;
  background: var(--bg-2);
  border-radius: 0 10px 10px 0;
  color: var(--text);
}
.lesson-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14.5px;
}
.lesson-body th, .lesson-body td {
  border: 1px solid var(--border);
  padding: 9px 14px;
  text-align: left;
}
.lesson-body th { background: var(--panel-2); font-weight: 500; }
.lesson-body ul, .lesson-body ol { padding-left: 24px; }
.lesson-body li { margin: 4px 0; }

.lesson-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin: 18px 0 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
}
.lesson-nav a.pill {
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  margin-left: 8px;
  font-size: 13px;
}
.lesson-nav a.pill:hover { border-color: var(--accent); }

/* ---- homework ---- */
.hw {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 30px;
  box-shadow: var(--shadow);
}
.hw h2 { margin-top: 0; font-weight: 500; font-size: 22px; }
.hw .prompt {
  background: var(--bg-2);
  border-left: 3px solid var(--accent);
  padding: 14px 20px;
  border-radius: 0 10px 10px 0;
  margin-bottom: 18px;
}

/* ---- tables (admin/dashboard) ---- */
table.data {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
table.data th, table.data td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 14px;
}
table.data th {
  color: var(--muted);
  font-weight: 500;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
table.data tr:hover td { background: var(--panel-2); }

.tabs { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.tabs button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
}
.tabs button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  border-color: transparent;
}

/* ---- small / utility ---- */
.small { font-size: 13px; color: var(--muted);
         font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.kbd {
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
}

/* ---- modal (admin) ---- */
.modal-back {
  display:none; position:fixed; inset:0;
  background:rgba(10, 8, 14, 0.65);
  z-index:50; align-items:center; justify-content:center;
  padding:24px;
  backdrop-filter: blur(4px);
}
.modal-card {
  max-width:900px; width:100%; max-height:90vh; overflow:auto;
  background: var(--panel);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}

/* ---- glass mode (set by theme.js when glass > 0.05) ---- */
body.glassy header.topbar {
  background: rgba(28, 24, 36, calc(0.45 * (1 - var(--glass, 0.7)) + 0.2));
  backdrop-filter: blur(calc(8px + var(--glass, 0.7) * 18px)) saturate(140%);
  -webkit-backdrop-filter: blur(calc(8px + var(--glass, 0.7) * 18px)) saturate(140%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
body.glassy .card,
body.glassy .lesson-body,
body.glassy .hw,
body.glassy .lesson-card,
body.glassy .modal-card {
  background: rgba(28, 24, 36, calc(0.55 - var(--glass, 0.7) * 0.35));
  backdrop-filter: blur(calc(6px + var(--glass, 0.7) * 16px)) saturate(140%);
  -webkit-backdrop-filter: blur(calc(6px + var(--glass, 0.7) * 16px)) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
body.glassy input[type="text"],
body.glassy input[type="email"],
body.glassy input[type="password"],
body.glassy input[type="number"],
body.glassy textarea,
body.glassy select {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
body.glassy table.data tr:hover td {
  background: rgba(255, 255, 255, 0.05);
}

@media (max-width: 640px) {
  main { padding: 24px 14px 120px; }
  .lesson-body { padding: 24px 20px; }
  .player { width: calc(100% - 24px); right: 12px; bottom: 12px; }
}

/* ============================================================
   NEW: brand mark, page fade, reading bar, plan stats, completion,
   lesson TOC, discussion, search palette, footer.
   ============================================================ */

/* page fade-in (set by app.js) */
html.with-fade body { animation: pageIn 220ms ease both; }
body.page-leave    { animation: pageOut 120ms ease both; }
@keyframes pageIn  { from { opacity: 0; transform: translateY(4px); }
                     to   { opacity: 1; transform: none; } }
@keyframes pageOut { from { opacity: 1; }
                     to   { opacity: 0; } }

/* brand mark (lowercase 'll' tile) */
header.topbar .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}
header.topbar .brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-family: Georgia, serif;
  font-size: 15px;
  letter-spacing: -1px;
}

/* search button in topbar */
header.topbar .topbtn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
  margin-left: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header.topbar .topbtn:hover { color: var(--text); border-color: var(--accent); }
header.topbar .topbtn .kbd  { font-size: 10px; padding: 1px 4px; }

/* reading progress bar at the very top */
.readbar {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  z-index: 100;
  transition: width 0.1s linear;
  pointer-events: none;
  box-shadow: 0 0 10px var(--accent);
}

/* plan-page stats */
.plan-stats {
  margin: 18px 0 26px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: var(--shadow);
}
.ps-bar {
  height: 8px;
  background: var(--bg-2);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 10px;
}
.ps-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  transition: width 0.4s ease;
}
.ps-row {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.ps-row strong { color: var(--text); font-weight: 600; }
.ps-sep { width: 4px; height: 4px; border-radius: 50%; background: var(--border); }

/* lesson-card progress bits */
.lesson-card { position: relative; }
.lc-check {
  position: absolute; top: 12px; right: 12px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--good); color: #1c1822;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
}
.lc-dot {
  position: absolute; top: 16px; right: 16px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--warn); box-shadow: 0 0 8px var(--warn);
  animation: lcPulse 2.4s ease-in-out infinite;
}
@keyframes lcPulse { 0%, 100% { opacity: 0.7; } 50% { opacity: 1; } }
.lesson-card.lc-done { opacity: 0.78; }
.lesson-card.lc-done:hover { opacity: 1; }
.lesson-card.lc-current {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset, var(--shadow);
}
.lc-progress {
  height: 3px; background: var(--bg-2); border-radius: 2px;
  margin: 6px 0 2px; overflow: hidden;
}
.lc-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* mark-as-complete row */
.complete-row {
  display: flex; align-items: center; gap: 14px;
  margin: 20px 0 0; padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.complete-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
}
.complete-btn:hover { border-color: var(--accent); }
.complete-btn .check {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 50%;
  border: 1.5px solid var(--muted); color: transparent;
  font-size: 11px; font-weight: 700;
  transition: all 0.15s;
}
.complete-btn.done {
  background: rgba(154, 219, 160, 0.1);
  border-color: var(--good);
  color: var(--good);
}
.complete-btn.done .check {
  background: var(--good); border-color: var(--good); color: #1c1822;
}

/* lesson reader layout: TOC + body */
.lesson-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 30px;
  align-items: start;
}
.lesson-toc {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow: auto;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  padding-right: 4px;
}
.toc-head {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.toc-link {
  display: block;
  padding: 5px 8px;
  margin: 1px 0;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  line-height: 1.35;
}
.toc-link.l3 {
  padding-left: 18px;
  font-size: 12.5px;
}
.toc-link:hover {
  color: var(--text);
  background: var(--panel-2);
  text-decoration: none;
}
.toc-link.active {
  color: var(--accent-2);
  border-left-color: var(--accent);
  background: var(--panel-2);
}
@media (max-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-toc {
    position: static;
    max-height: none;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
  }
}

/* discussion */
.discussion {
  margin-top: 28px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
  box-shadow: var(--shadow);
}
.comment {
  display: flex; gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.comment:first-of-type { border-top: none; padding-top: 0; }
.c-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  flex: none;
  object-fit: cover;
}
.c-avatar-blank {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-2); color: var(--muted); font-weight: 600; font-size: 14px;
}
.c-body { flex: 1; min-width: 0; }
.c-meta {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 4px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13.5px;
}
.c-author { font-weight: 500; color: var(--text); }
.c-admin {
  margin-left: 6px;
  font-size: 10px; font-weight: 600;
  background: var(--accent); color: #1c1822;
  padding: 1px 6px; border-radius: 999px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.c-del { margin-left: auto; font-size: 16px; padding: 0 6px; }
.c-text { color: var(--text); line-height: 1.55; font-size: 14.5px; }

/* code block enhancements */
.codeblock {
  position: relative;
  margin: 14px 0;
}
.codeblock-actions {
  position: absolute;
  top: 8px; right: 8px;
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.15s;
}
.codeblock:hover .codeblock-actions,
.codeblock.cb-editing .codeblock-actions { opacity: 1; }
.cb-btn {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 7px;
  padding: 4px 9px;
  font-size: 11.5px;
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.3;
}
.cb-btn:hover { background: rgba(255,255,255,0.12); border-color: var(--accent); }
.cb-btn.cb-run {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  border-color: transparent;
  font-weight: 600;
}
.cb-tag {
  display: inline-flex; align-items: center;
  font-size: 10px; padding: 3px 7px;
  background: var(--panel-2); color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px;
  letter-spacing: 0.5px; text-transform: uppercase;
}
textarea.cb-edit {
  width: 100%;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.55;
  resize: vertical;
  min-height: 80px;
}
.cb-output {
  background: var(--bg-2);
  color: var(--text);
  padding: 12px 14px;
  margin-top: 4px;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 240px;
  overflow: auto;
}
.cb-output--err {
  border-left-color: var(--bad);
  color: var(--bad);
}

/* search palette */
.k-back {
  position: fixed; inset: 0;
  background: rgba(10, 8, 14, 0.55);
  backdrop-filter: blur(6px);
  display: none;
  align-items: flex-start; justify-content: center;
  padding: 80px 20px 20px;
  z-index: 200;
}
.k-back.open { display: flex; }
.k-panel {
  width: 100%; max-width: 600px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.5);
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  animation: kPop 160ms ease;
}
@keyframes kPop {
  from { opacity: 0; transform: translateY(-8px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
.k-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.k-head input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 15px;
  outline: none;
  padding: 6px 0;
}
.k-results {
  max-height: 50vh;
  overflow: auto;
}
.k-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--text);
  border-top: 1px solid transparent;
  border-bottom: 1px solid transparent;
}
.k-item:hover, .k-item--sel {
  background: var(--bg-2);
  text-decoration: none;
}
.k-item--sel { border-color: var(--accent); }
.k-type {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 999px;
}
.k-type--lesson { color: var(--accent-2); border-color: rgba(201, 168, 255, 0.4); }
.k-type--heading { color: var(--warn); }
.k-type--page    { color: var(--good); }
.k-title { font-size: 14px; }
.k-sub   { color: var(--muted); font-size: 12px; white-space: nowrap;
           overflow: hidden; text-overflow: ellipsis; max-width: 220px; }
.k-empty { padding: 22px; text-align: center; color: var(--muted); }
.k-foot {
  display: flex; gap: 14px;
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 11px;
}

/* site footer (mounted by app.js) */
.site-footer {
  margin-top: 60px;
  padding: 18px 26px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  color: var(--muted);
}
.sf-row {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  max-width: 1100px; margin: 0 auto;
}
.sf-left { display: flex; align-items: center; gap: 10px; }
.sf-mark {
  width: 22px; height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-family: Georgia, serif;
  font-size: 11px;
  letter-spacing: -1px;
}
.sf-mid { flex: 1; min-width: 0; font-style: italic; opacity: 0.85; }
.sf-right { margin-left: auto; }
.sf-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  font-size: 12px;
}
.sf-pill--on { color: var(--good); border-color: rgba(154, 219, 160, 0.4); }
.sf-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 6px var(--good);
  animation: ohPulse 1.8s ease-in-out infinite;
}
@keyframes ohPulse { 0%, 100% { opacity: 0.6; } 50% { opacity: 1; } }

/* ===================================================================
   MEDIA STUDIO - left-edge dock button + side panel + popout video
   =================================================================== */

/* Dock button (always visible, fixed to the left edge) */
.studio-dock {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  background: rgba(28, 24, 36, 0.85);
  border: 1px solid rgba(255,255,255,0.08);
  border-left: none;
  color: var(--text);
  padding: 14px 12px;
  border-radius: 0 14px 14px 0;
  cursor: pointer;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 11px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  transition: padding 0.15s, background 0.15s, border-color 0.15s;
}
.studio-dock:hover {
  padding-right: 18px;
  background: rgba(36, 30, 48, 0.95);
  border-color: var(--accent);
}
.dock-eq {
  display: inline-flex; gap: 3px; align-items: flex-end;
  height: 14px;
}
.dock-eq i {
  width: 3px; background: var(--accent); border-radius: 1px;
  animation: dockEq 1.1s ease-in-out infinite;
}
.dock-eq i:nth-child(1) { height: 6px; animation-delay: -0.2s; }
.dock-eq i:nth-child(2) { height: 12px; animation-delay: -0.5s; }
.dock-eq i:nth-child(3) { height: 8px; animation-delay: -0.9s; }
@keyframes dockEq {
  0%, 100% { transform: scaleY(0.45); }
  50%      { transform: scaleY(1.4); }
}
.dock-label {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  color: var(--muted);
}

/* Studio backdrop + side panel */
.studio-back {
  position: fixed; inset: 0;
  background: rgba(10, 8, 14, 0.55);
  backdrop-filter: blur(6px);
  z-index: 70;
  display: none;
  align-items: stretch; justify-content: flex-start;
}
.studio-back.open { display: flex; }
.studio-panel {
  width: 460px;
  max-width: 100vw;
  background: rgba(28, 24, 36, 0.96);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-right: 1px solid rgba(255,255,255,0.07);
  box-shadow: 0 20px 60px rgba(0,0,0,0.55);
  display: flex; flex-direction: column;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  animation: studioIn 200ms ease;
}
@keyframes studioIn {
  from { transform: translateX(-30px); opacity: 0; }
  to   { transform: none; opacity: 1; }
}

.studio-head {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--border);
}
.studio-head .tabs { display: flex; gap: 4px; flex: 1; margin: 0; }
.studio-head .tab {
  background: transparent; border: none; color: var(--muted);
  padding: 6px 14px; border-radius: 999px;
  font-size: 13px; cursor: pointer;
}
.studio-head .tab.tab--on {
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822; font-weight: 600;
}
.studio-close {
  background: transparent; border: none; color: var(--muted);
  font-size: 22px; line-height: 1; padding: 4px 10px;
  border-radius: 8px; cursor: pointer;
}
.studio-close:hover { background: rgba(255,255,255,0.06); color: var(--text); }

.studio-body { flex: 1; overflow: auto; padding: 16px 18px 24px; }
.pane { display: block; }

/* --- music pane --- */
.now {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 14px;
}
.now-art {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  display: flex; align-items: center; justify-content: center;
  color: #1c1822; font-size: 28px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
  flex: none;
}
.now-text  { flex: 1; min-width: 0; }
.now-title  { font-size: 16px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.now-artist { font-size: 13px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.progress { margin-bottom: 12px; }
.progress .bar {
  position: relative; height: 4px;
  background: rgba(255,255,255,0.08); border-radius: 2px;
  cursor: pointer; transition: height 0.15s;
}
.progress .bar:hover { height: 6px; }
.progress .fill {
  position: absolute; top: 0; left: 0; height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  border-radius: 2px;
}
.progress .thumb {
  position: absolute; top: 50%; left: 0;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent-2);
  transform: translate(-50%, -50%);
  opacity: 0; transition: opacity 0.15s;
  box-shadow: 0 0 8px var(--accent);
}
.progress .bar:hover .thumb { opacity: 1; }
.progress .times {
  display: flex; justify-content: space-between;
  font-size: 10.5px; color: var(--muted);
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
}

.controls {
  display: flex; align-items: center; gap: 8px; margin-bottom: 14px;
}
.ctl {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.06);
  width: 34px; height: 34px;
  border-radius: 50%;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0;
  transition: background 0.12s, transform 0.08s;
  position: relative;
}
.ctl:hover  { background: rgba(255,255,255,0.1); }
.ctl:active { transform: scale(0.94); }
.ctl.play {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #1c1822;
  border: none;
  box-shadow: 0 4px 16px rgba(201,168,255,0.35);
}
.ctl.tog.on {
  background: rgba(201,168,255,0.18);
  border-color: var(--accent);
  color: var(--accent-2);
}
.ctl.tog[data-mode="one"]::after {
  content: "1";
  position: absolute; top: 1px; right: 4px;
  font-size: 8px; font-weight: 700; color: var(--accent-2);
}
.vol-wrap {
  display: flex; align-items: center; gap: 8px;
  margin-left: auto; flex: 1; max-width: 140px;
  color: var(--muted);
}
.vol {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: linear-gradient(
    to right,
    var(--accent) 0%, var(--accent) var(--p, 45%),
    rgba(255,255,255,0.1) var(--p, 45%), rgba(255,255,255,0.1) 100%);
  outline: none; cursor: pointer; padding: 0; margin: 0; border: none;
}
.vol::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid #1c1822;
  cursor: pointer; box-shadow: 0 0 6px var(--accent);
}
.vol::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-2); border: 2px solid #1c1822;
  cursor: pointer; box-shadow: 0 0 6px var(--accent);
}

.lists { margin-bottom: 10px; }
.pl {
  border-radius: 10px;
  padding: 8px 10px;
  margin-bottom: 6px;
  border: 1px solid transparent;
  cursor: pointer;
}
.pl:hover  { background: rgba(255,255,255,0.04); }
.pl.pl--on { background: rgba(201,168,255,0.08); border-color: var(--accent); }
.pl-head { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.pl-name { flex: 1; font-weight: 500; }
.pl-count {
  font-size: 11px; color: var(--muted);
  background: rgba(255,255,255,0.05);
  padding: 2px 7px; border-radius: 999px;
}
.pl-del {
  background: transparent; border: none; color: var(--muted);
  font-size: 16px; cursor: pointer; padding: 0 4px;
}
.pl-del:hover { color: var(--bad); }
.tracks { list-style: none; padding: 6px 0 2px 8px; margin: 4px 0 0; border-left: 1px solid var(--border); }
.tracks li {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 6px; border-radius: 6px;
  font-size: 12.5px; cursor: pointer; color: var(--text);
}
.tracks li:hover { background: rgba(255,255,255,0.05); }
.tracks li.trk--on { color: var(--accent-2); }
.trk-num   { color: var(--muted); width: 22px; flex: none; font-variant-numeric: tabular-nums; }
.trk-tag {
  font-size: 9px; font-weight: 700; color: #ff6b6b;
  background: rgba(255,107,107,0.12); border: 1px solid rgba(255,107,107,0.35);
  padding: 1px 5px; border-radius: 4px; letter-spacing: 0.5px; flex: none;
}
.trk-title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trk-art   { color: var(--muted); font-size: 11px; max-width: 100px;
             white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trk-del   { background: transparent; border: none; color: var(--muted);
             font-size: 14px; cursor: pointer; padding: 0 4px; }
.trk-del:hover { color: var(--bad); }

.actions { display: flex; gap: 8px; margin-top: 6px; }
.actions .sec {
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 8px;
  font-size: 12px; cursor: pointer;
}
.actions .sec:hover { border-color: var(--accent); }

.note { min-height: 14px; font-size: 11px; color: var(--muted); margin-top: 6px; text-align: center; }

/* --- video pane --- */
.video-now {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px;
}
.vn-meta { flex: 1; min-width: 0; }
.vn-title   { font-size: 14px; font-weight: 600; color: var(--text);
              white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vn-channel { font-size: 12px; color: var(--muted);
              white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.video-now .sec {
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 8px;
  font-size: 12px; cursor: pointer;
}
.video-now .sec:hover { border-color: var(--accent); }

.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}
.video-frame iframe { width: 100%; height: 100%; border: 0; display: block; }
.video-placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 13px;
}

.video-actions {
  display: flex; gap: 8px; margin-bottom: 18px;
}
.video-actions .sec {
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 8px;
  font-size: 12px; cursor: pointer; flex: 1;
}
.video-actions .sec:hover { border-color: var(--accent); }

.vsec {
  margin: 14px 0 8px;
  font-size: 11px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.vid-list { display: grid; gap: 8px; }
.vid {
  display: grid; grid-template-columns: 90px 1fr auto; gap: 10px;
  align-items: center;
  padding: 6px; border-radius: 10px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  cursor: pointer; transition: border-color 0.15s, transform 0.1s;
}
.vid:hover  { border-color: var(--accent); transform: translateY(-1px); }
.vid.vid--on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.vid-thumb {
  width: 90px; height: 51px;
  border-radius: 6px;
  object-fit: cover;
  background: #000;
}
.vid-meta { min-width: 0; }
.vid-title   { font-size: 13px; font-weight: 500;
               white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vid-channel { font-size: 11.5px; color: var(--muted);
               white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vid-del {
  background: transparent; border: none; color: var(--muted);
  font-size: 18px; cursor: pointer; padding: 0 8px;
}
.vid-del:hover { color: var(--bad); }

/* --- popped-out video window --- */
.video-popout {
  position: fixed;
  right: 20px; bottom: 20px;
  width: 380px; height: 260px;
  background: #0b0810;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0,0,0,0.6);
  z-index: 65;
  display: flex; flex-direction: column;
  overflow: hidden;
  resize: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.vp-head {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  background: rgba(28,24,36,0.85);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  cursor: grab;
  font-size: 12px; color: var(--muted);
}
.vp-head:active { cursor: grabbing; }
.vp-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
            max-width: 240px; color: var(--text); font-weight: 500; }
.vp-btn {
  background: transparent; border: none; color: var(--muted);
  width: 24px; height: 24px; border-radius: 6px;
  cursor: pointer; font-size: 14px;
  display: inline-flex; align-items: center; justify-content: center;
}
.vp-btn:hover { background: rgba(255,255,255,0.08); color: var(--text); }
.vp-frame { flex: 1; background: #000; }
.vp-frame iframe { width: 100%; height: 100%; border: 0; display: block; }
.vp-resize {
  position: absolute; right: 0; bottom: 0;
  width: 14px; height: 14px;
  cursor: nwse-resize;
  background:
    linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.25) 50%);
  border-bottom-right-radius: 12px;
}

@media (max-width: 640px) {
  .studio-panel { width: 100vw; }
  .video-popout { width: calc(100vw - 24px); right: 12px; bottom: 12px; height: 240px; }
}

/* ---- file attachments (homework + admin grading) ---- */
.attach-zone {
  display: flex; align-items: center; gap: 10px;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--bg-2);
  transition: border-color 0.15s, background 0.15s;
}
.attach-zone.drag {
  border-color: var(--accent);
  background: rgba(201, 168, 255, 0.08);
}
.attach-zone .secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.attach-zone .secondary:hover { border-color: var(--accent); }

.attach-list {
  list-style: none;
  padding: 0;
  margin: 10px 0 16px;
}
.att-row {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
}
.att-icon { color: var(--accent-2); flex: none; }
.att-name { flex: 1; min-width: 0;
            white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
            color: var(--text); text-decoration: none; }
a.att-name:hover { color: var(--accent-2); text-decoration: underline; }
.att-size { flex: none; }
.att-state { color: var(--good); flex: none; }
.att-state.err { color: var(--bad); }
.att-del {
  background: transparent; border: none;
  color: var(--muted); cursor: pointer;
  font-size: 16px; padding: 0 6px;
}
.att-del:hover { color: var(--bad); }

/* ---- mode tags (studio vs anywhere) ---- */
.badge.mode-studio {
  color: #ffcf85;
  border-color: rgba(255, 207, 133, 0.35);
  background: rgba(255, 207, 133, 0.05);
}
.badge.mode-anywhere {
  color: #9ee5a8;
  border-color: rgba(158, 229, 168, 0.35);
  background: rgba(158, 229, 168, 0.05);
}

/* Subtle corner ribbon on the lesson article. Sits at the top-right
   without taking layout space; clear, quiet, hover-tooltipped. */
.lesson-body { position: relative; }
.mode-ribbon {
  position: absolute;
  top: 14px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-size: 10.5px;
  letter-spacing: 0.7px;
  text-transform: uppercase;
  font-weight: 500;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-2);
  color: var(--muted);
  pointer-events: auto;
  user-select: none;
}
.mode-ribbon::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 6px currentColor;
}
.mode-ribbon.mode-ribbon--studio {
  color: #ffcf85;
  border-color: rgba(255, 207, 133, 0.35);
  background: rgba(255, 207, 133, 0.06);
}
.mode-ribbon.mode-ribbon--anywhere {
  color: #9ee5a8;
  border-color: rgba(158, 229, 168, 0.35);
  background: rgba(158, 229, 168, 0.06);
}
@media (max-width: 640px) {
  .mode-ribbon { top: 10px; right: 10px; font-size: 10px; }
}