:root{
  --bg:#fbfaf7;
  --paper:#ffffff;
  --ink:#1f2428;
  --muted:#65707a;
  --line:#e5ded4;
  --accent:#7a2e2e;
  --accent-soft:#f7eeee;
  --shade:#f2efe9;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Noto Sans",Arial,sans-serif;line-height:1.65;font-size:17px}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.site-header{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.header-grid{display:grid;grid-template-columns:290px 1fr;gap:24px;align-items:center;padding-top:18px;padding-bottom:16px}
.brand{display:block;font-size:1.35rem;font-weight:720;letter-spacing:.01em;color:var(--ink)}
.tagline{margin:.1rem 0 0;color:var(--muted);font-size:.92rem}
.main-nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px 16px;font-size:.95rem}.main-nav a{color:var(--ink)}
.layout{display:grid;grid-template-columns:220px 1fr;gap:40px;padding-top:34px;padding-bottom:50px}
.sidebar{position:sticky;top:108px;align-self:start;color:var(--muted);font-size:.94rem}.sidebar h2{font-size:.95rem;color:var(--ink);text-transform:uppercase;letter-spacing:.08em}.sidebar hr{border:0;border-top:1px solid var(--line);margin:20px 0}
.week-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}.week-grid a{display:block;text-align:center;border:1px solid var(--line);border-radius:8px;padding:4px 0;background:var(--paper);font-size:.82rem;color:var(--ink)}.week-grid a:hover{background:var(--accent-soft);text-decoration:none}
.content{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:42px 48px;box-shadow:0 2px 20px rgba(0,0,0,.025)}
h1{font-size:2.25rem;line-height:1.15;margin:0 0 18px}h2{font-size:1.35rem;margin:34px 0 12px}h3{font-size:1.08rem;margin:26px 0 8px}.lead{font-size:1.15rem;color:#30363d}.small{font-size:.92rem;color:var(--muted)}
.card{border:1px solid var(--line);background:#fff;border-radius:16px;padding:22px 24px;margin:18px 0}.card h2{margin-top:0}.note{background:var(--shade);border-left:4px solid var(--accent);padding:14px 18px;border-radius:8px;margin:18px 0}.callout{background:var(--accent-soft);border:1px solid #ead0d0;border-radius:16px;padding:18px 20px;margin:20px 0}
.dev{font-family:"Noto Serif Devanagari","Noto Sans Devanagari","Kohinoor Devanagari","Mangal",serif;font-size:1.32rem}.iast{font-family:"Times New Roman",Georgia,serif;font-style:italic;color:#343a40}.translation{color:#3e454b}.verse{border-left:4px solid var(--line);padding:12px 0 12px 18px;margin:16px 0;background:#fff}.verse .dev{display:block;font-size:1.48rem;line-height:1.8}.verse .iast{display:block;margin-top:8px}
.table-wrap{overflow-x:auto;margin:16px 0}table{border-collapse:collapse;width:100%;font-size:.96rem}th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}th{background:var(--shade)}
ul,ol{padding-left:1.35rem}.exercise-list li{margin-bottom:14px}.answer{border:1px solid var(--line);background:var(--shade);border-radius:12px;padding:12px 16px;margin:18px 0}.answer summary{cursor:pointer;font-weight:650;color:var(--accent)}
.buttons{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.button{display:inline-block;padding:10px 16px;border:1px solid var(--accent);border-radius:999px;color:var(--accent);background:#fff;font-weight:600}.button:hover{background:var(--accent-soft);text-decoration:none}.prev-next{display:flex;justify-content:space-between;margin-top:40px;border-top:1px solid var(--line);padding-top:24px}
.progress{height:8px;background:var(--shade);border-radius:999px;overflow:hidden;margin:18px 0}.bar{height:100%;background:var(--accent)}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;padding:24px 0;background:var(--paper)}
.codeblock{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#f6f8fa;border:1px solid var(--line);border-radius:12px;padding:14px;overflow:auto}
@media(max-width:900px){.header-grid{grid-template-columns:1fr}.main-nav{justify-content:flex-start}.layout{grid-template-columns:1fr}.sidebar{position:static}.content{padding:28px 22px}h1{font-size:1.8rem}.week-grid{grid-template-columns:repeat(9,1fr)}}