:root {
  --bg: #f6f7f5;
  --card: #ffffff;
  --text: #1b1f1d;
  --muted: #5d6662;
  --line: #dde2df;
  --brand: #1f6f5c;
  --brand-soft: #e3f1ec;
  --warn: #8a5a00;
  --warn-soft: #fff3d6;
  --done: #2e7d32;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121514;
    --card: #1b201e;
    --text: #e8ecea;
    --muted: #9aa5a0;
    --line: #2c3431;
    --brand: #5cc0a3;
    --brand-soft: #1d332c;
    --warn: #f2c25b;
    --warn-soft: #3a2f14;
    --done: #7bc67e;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Telugu", "Noto Sans Devanagari", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.top { padding: 16px 16px 0; max-width: 760px; margin: 0 auto; }
h1 { margin: 0; font-size: 1.5rem; color: var(--brand); }
.sub { margin: 2px 0 12px; color: var(--muted); font-size: .9rem; }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); }
.tabs button {
  flex: 1; padding: 10px 4px; border: 0; background: none; color: var(--muted);
  font: inherit; font-weight: 600; border-bottom: 3px solid transparent; cursor: pointer;
}
.tabs button.active { color: var(--brand); border-bottom-color: var(--brand); }

main { max-width: 760px; margin: 0 auto; padding: 16px; }
.foot { max-width: 760px; margin: 0 auto; padding: 0 16px 32px; color: var(--muted); font-size: .8rem; }
.muted { color: var(--muted); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; margin-bottom: 12px;
}
.card h2 { margin: 0 0 4px; font-size: 1.25rem; }
.card h3 { margin: 16px 0 6px; font-size: 1rem; }
.meta { color: var(--muted); font-size: .9rem; margin: 0 0 8px; }
.pill {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand); font-size: .8rem; font-weight: 600;
}
.pill.warn { background: var(--warn-soft); color: var(--warn); }

.block { border-left: 3px solid var(--brand); padding-left: 12px; margin: 12px 0; }
.block .label { font-size: .8rem; font-weight: 700; color: var(--brand); text-transform: uppercase; letter-spacing: .03em; }

ul.topics { padding-left: 18px; margin: 6px 0; }
ul.topics li { margin-bottom: 10px; }

a.video {
  display: block; margin-top: 4px; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 8px; color: var(--text); text-decoration: none; font-size: .9rem;
}
a.video:hover { border-color: var(--brand); }
a.video .lang { font-weight: 700; color: var(--brand); margin-right: 6px; }
a.video .ch { color: var(--muted); }

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.btn {
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--text); font: inherit; cursor: pointer;
}
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
.btn:disabled { opacity: .4; cursor: default; }
.spacer { flex: 1; }

.progress { height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; margin: 8px 0 4px; }
.progress div { height: 100%; background: var(--brand); }

select { font: inherit; padding: 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); }

table.week { width: 100%; border-collapse: collapse; }
table.week td { padding: 10px 6px; border-top: 1px solid var(--line); vertical-align: top; }
table.week td.d { width: 46px; font-weight: 700; }
table.week td.s { width: 120px; }
table.week tr.done td { color: var(--muted); }
table.week tr.done td.d::after { content: " ✓"; color: var(--done); }
table.week tr { cursor: pointer; }

details { border-top: 1px solid var(--line); padding: 8px 0; }
details summary { cursor: pointer; font-weight: 600; }

@media (max-width: 480px) {
  table.week td.s { width: 90px; font-size: .9rem; }
}

.install {
  display: flex; gap: 10px; align-items: center; justify-content: space-between;
  background: var(--brand-soft); border-radius: 10px; padding: 10px 12px; margin-bottom: 12px; font-size: .9rem;
}
.install[hidden] { display: none; }

.title-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.lang-switch { display: flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: var(--card); }
.lang-switch button {
  border: 0; background: none; color: var(--muted); font: inherit; font-size: .85rem; font-weight: 600;
  padding: 6px 12px; cursor: pointer;
}
.lang-switch button.active { background: var(--brand); color: #fff; }
.orig { display: block; color: var(--muted); font-size: .8rem; }