:root {
  --bg: #f6f7f9; --surface: #ffffff; --text: #16191f; --muted: #5b6472;
  --border: #dfe3e8; --accent: #0b7a5e; --accent-soft: #e3f3ee; --code: #eef1f4;
  --warn: #8a5a00; --warn-soft: #fff4dc; --mark: #ffe58a;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117; --surface: #151b23; --text: #e6e9ee; --muted: #9aa4b2;
    --border: #2a323d; --accent: #3ddc97; --accent-soft: #12322a; --code: #1d2530;
    --warn: #ffcf66; --warn-soft: #3a2e12; --mark: #6b5600;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1117; --surface: #151b23; --text: #e6e9ee; --muted: #9aa4b2;
  --border: #2a323d; --accent: #3ddc97; --accent-soft: #12322a; --code: #1d2530;
  --warn: #ffcf66; --warn-soft: #3a2e12; --mark: #6b5600;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif; }
a { color: var(--accent); }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; color: var(--text); text-decoration: none; white-space: nowrap; }
.brand span { color: var(--accent); }
.badge { font-size: 12px; font-weight: 600; color: var(--warn); background: var(--warn-soft);
  padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.search { position: relative; flex: 1; max-width: 520px; margin-left: auto; }
.search input { width: 100%; padding: 8px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px; }
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.results { position: absolute; left: 0; right: 0; top: calc(100% + 6px); max-height: 70vh;
  overflow: auto; background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.18); display: none; }
.results.open { display: block; }
.results a { display: block; padding: 10px 14px; color: var(--text); text-decoration: none;
  border-bottom: 1px solid var(--border); }
.results a:hover, .results a:focus, .results a.sel { background: var(--accent-soft); outline: none; }
.results .r-where { font-size: 13px; color: var(--muted); }
.results .r-snip { font-size: 14px; }
.results mark { background: var(--mark); color: inherit; border-radius: 2px; }
.results .empty { padding: 12px 14px; color: var(--muted); }
.icon-btn { background: none; border: 1px solid var(--border); color: var(--text); border-radius: 8px;
  padding: 6px 10px; font: inherit; cursor: pointer; }
.menu-btn { display: none; }
.layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); max-width: 1240px; margin: 0 auto; }
nav.side { position: sticky; top: 57px; height: calc(100vh - 57px); overflow: auto; padding: 20px 12px 40px 16px;
  border-right: 1px solid var(--border); }
.nav-label { margin: 18px 8px 6px; font-size: 12px; font-weight: 700; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted); }
.nav-label:first-child { margin-top: 0; }
nav.side ul { list-style: none; margin: 0; padding: 0; }
nav.side a { display: block; padding: 6px 10px; border-radius: 6px; color: var(--text);
  text-decoration: none; font-size: 15px; }
nav.side a:hover { background: var(--code); }
nav.side a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
main { padding: 28px 40px 80px; min-width: 0; }
article { max-width: 78ch; }
.meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 36px 0 10px; padding-top: 8px; border-top: 1px solid var(--border); }
h3 { font-size: 18px; margin: 26px 0 8px; }
h2, h3, h4 { scroll-margin-top: 72px; }
blockquote { margin: 16px 0; padding: 10px 16px; background: var(--accent-soft);
  border-left: 4px solid var(--accent); border-radius: 0 8px 8px 0; }
blockquote p { margin: 6px 0; }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: .92em; }
pre { background: var(--code); padding: 12px; border-radius: 8px; overflow: auto; }
.table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; background: var(--surface); }
th, td { padding: 8px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--code); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
li { margin: 3px 0; }
input[type=checkbox] { margin-right: 6px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 28px 0; }
:target { animation: flash 1.6s ease-out; }
@keyframes flash { from { background: var(--mark); } to { background: transparent; } }
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .menu-btn { display: inline-block; }
  nav.side { display: none; position: fixed; inset: 57px 0 0 0; height: auto; z-index: 9;
    background: var(--surface); border-right: 0; }
  body.nav-open nav.side { display: block; }
  main { padding: 20px 16px 60px; }
  h1 { font-size: 25px; }
  .badge, .theme-btn { display: none; }
}

/* ---- Signed-in user bar ---- */
.userbar { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.userbar a, .userbar button { font-size: 14px; color: var(--muted); text-decoration: none; background: none;
  border: 0; padding: 6px 8px; border-radius: 6px; cursor: pointer; font-family: inherit; }
.userbar a:hover, .userbar button:hover { background: var(--code); color: var(--text); }
.userbar form { margin: 0; }
@media (max-width: 860px) { .userbar .who { display: none; } }

/* ---- Auth and admin pages ---- */
.auth { max-width: 420px; margin: 8vh auto; padding: 0 16px; }
.wide { max-width: 980px; margin: 32px auto 80px; padding: 0 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 24px; margin-bottom: 20px; }
.card h1 { font-size: 24px; } .card h2 { border-top: 0; margin-top: 0; padding-top: 0; font-size: 19px; }
label { display: block; font-weight: 600; font-size: 14px; margin: 14px 0 6px; }
.field { width: 100%; padding: 10px 12px; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; }
.field:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn { display: inline-block; margin-top: 18px; padding: 10px 16px; font: inherit; font-weight: 600; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--surface); cursor: pointer; text-decoration: none; }
.btn.secondary { background: transparent; color: var(--accent); }
.btn.danger { background: transparent; color: #d64545; border-color: #d64545; }
.btn.small { margin: 0; padding: 4px 10px; font-size: 13px; font-weight: 500; }
.hint { font-size: 13px; color: var(--muted); margin: 6px 0 0; }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.msg.err { background: #fde8e8; color: #9b1c1c; } .msg.ok { background: var(--accent-soft); color: var(--accent); }
:root[data-theme="dark"] .msg.err { background: #3b1717; color: #ffb4b4; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .msg.err { background: #3b1717; color: #ffb4b4; } }
.secret { font-family: ui-monospace, Menlo, monospace; font-size: 17px; letter-spacing: .08em; word-break: break-all;
  background: var(--code); padding: 10px 12px; border-radius: 8px; }
.copy { font-family: ui-monospace, Menlo, monospace; font-size: 13px; word-break: break-all; background: var(--code);
  padding: 10px 12px; border-radius: 8px; user-select: all; }
.row-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.row-actions form { margin: 0; }
.pill { font-size: 12px; padding: 1px 8px; border-radius: 999px; background: var(--code); color: var(--muted); }
.pill.on { background: var(--accent-soft); color: var(--accent); } .pill.off { background: #fde8e8; color: #9b1c1c; }
.inline { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.inline > div { flex: 1; min-width: 160px; } .inline .btn { margin-top: 0; }

/* ---- Academy ---- */
video.lesson { display: block; width: 100%; max-width: 100%; aspect-ratio: 16 / 9; background: #000;
  border-radius: 10px; margin: 12px 0 8px; }
.video-pending { padding: 14px 16px; border: 1px dashed var(--border); border-radius: 10px; color: var(--muted); font-size: 14px; }