/* ============================================================
   MyDiary Course — ธีมหลัก
   หัวข้อ: IBM Plex Sans Thai · เนื้อหา: Sarabun · โค้ด: IBM Plex Mono
   ============================================================ */

:root{
  --bg:#f4f4fb;
  --surface:#ffffff;
  --ink:#1f1b3a;
  --muted:#6b6785;
  --faint:#9793b0;
  --line:#e5e3f2;
  --line-strong:#d5d2ea;

  --indigo:#4f46e5;
  --indigo-deep:#3730a3;
  --indigo-soft:#eeecfb;

  --lab:#0d9488;
  --lab-soft:#e2f5f2;
  --hw:#d97706;
  --hw-soft:#fdf1df;

  --code-bg:#1e1b39;
  --code-ink:#e7e5f5;

  --accent:var(--indigo);
  --accent-soft:var(--indigo-soft);
  --accent-deep:var(--indigo-deep);

  --maxw:74ch;
  --radius:14px;
  --radius-lg:22px;
  --shadow:0 1px 2px rgba(31,27,58,.05), 0 10px 30px -18px rgba(31,27,58,.28);
  --shadow-lift:0 2px 6px rgba(31,27,58,.06), 0 22px 48px -24px rgba(31,27,58,.35);
}

/* accent ประจำประเภทเอกสาร (lesson = คราม ค่าเริ่มต้น) */
.page-lab{--accent:var(--lab);--accent-soft:var(--lab-soft);--accent-deep:#0b5f57}
.page-hw{--accent:var(--hw);--accent-soft:var(--hw-soft);--accent-deep:#985506}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Sarabun",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:18px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  font-family:"IBM Plex Sans Thai","Sarabun",system-ui,sans-serif;
  line-height:1.3;
  color:var(--ink);
  font-weight:600;
}
a{color:var(--indigo-deep);text-underline-offset:3px;text-decoration-thickness:1.5px}
code,pre,kbd{font-family:"IBM Plex Mono","JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace}

/* ---------- Header / top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:40;
  background:rgba(244,244,251,.82);
  backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar .inner{
  max-width:1180px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;
  font-family:"IBM Plex Sans Thai",sans-serif;color:var(--ink);text-decoration:none;font-size:1.12rem}
.brand .mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--indigo),#7c74f0);color:#fff;
  box-shadow:0 6px 16px -6px rgba(79,70,229,.7);
}
.brand .mark svg{width:19px;height:19px}
.brand small{display:block;font-size:.68rem;font-weight:500;color:var(--muted);letter-spacing:.02em;margin-top:-2px}
.topbar .spacer{flex:1}
.backlink{
  display:inline-flex;align-items:center;gap:7px;font-size:.92rem;font-weight:500;
  color:var(--muted);text-decoration:none;padding:7px 13px;border-radius:999px;
  border:1px solid var(--line-strong);background:var(--surface);
}
.backlink:hover{color:var(--ink);border-color:var(--faint)}
.backlink svg{width:15px;height:15px}

/* ---------- Doc-type pills (content pages) ---------- */
.pills{display:flex;gap:8px;flex-wrap:wrap}
.pill{
  display:inline-flex;align-items:center;gap:7px;text-decoration:none;
  font-size:.9rem;font-weight:500;color:var(--muted);
  padding:7px 14px;border-radius:999px;border:1px solid var(--line);
  background:var(--surface);white-space:nowrap;
}
.pill svg{width:15px;height:15px;opacity:.75}
.pill:hover{color:var(--ink);border-color:var(--line-strong)}
.pill.is-active{color:#fff;border-color:transparent;background:var(--accent)}
.pill.is-active svg{opacity:1}

/* ---------- Layout for content pages ---------- */
.layout{max-width:1180px;margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:1fr;gap:40px}
@media(min-width:1080px){
  .layout{grid-template-columns:minmax(0,1fr) 250px;align-items:start;padding-top:8px}
}
main.doc{min-width:0;padding:38px 0 90px}

.doctag{
  display:inline-flex;align-items:center;gap:9px;
  font-size:.82rem;font-weight:600;letter-spacing:.01em;
  color:var(--accent);background:var(--accent-soft);
  padding:6px 14px;border-radius:999px;margin-bottom:22px;
}
.doctag svg{width:15px;height:15px}

/* ---------- Prose ---------- */
.prose{max-width:var(--maxw)}
.prose>*{margin-inline:0}
.prose h1{font-size:2.05rem;font-weight:700;margin:.2em 0 .55em;letter-spacing:-.01em}
.prose h1:first-child{margin-top:0}
.prose h1{padding-bottom:.3em;border-bottom:2px solid var(--accent)}
.prose h1:not(:first-of-type){margin-top:2.4em}
.prose h2{font-size:1.42rem;margin:2em 0 .5em;color:var(--accent-deep)}
.prose h3{font-size:1.15rem;margin:1.6em 0 .4em}
.prose h4{font-size:1rem;margin:1.3em 0 .3em;color:var(--muted)}
.prose p{margin:.85em 0}
.prose strong{font-weight:700;color:var(--ink)}
.prose a{font-weight:500}
.prose ul,.prose ol{margin:.7em 0;padding-left:1.4em}
.prose li{margin:.3em 0}
.prose li::marker{color:var(--accent)}
.prose hr{border:0;height:1px;background:var(--line-strong);margin:2.4em 0}
.prose img{max-width:100%;border-radius:12px}

/* inline code */
.prose :not(pre)>code{
  font-size:.86em;background:var(--indigo-soft);color:var(--indigo-deep);
  padding:.12em .4em;border-radius:6px;font-weight:500;
  word-break:break-word;
}

/* blockquote — used for tips/goals/checkpoints */
.prose blockquote{
  margin:1.3em 0;padding:14px 18px;
  background:var(--surface);border:1px solid var(--line);
  border-left:4px solid var(--accent);border-radius:12px;
  color:var(--ink);box-shadow:var(--shadow);
}
.prose blockquote p{margin:.35em 0}
.prose blockquote strong{color:var(--accent)}

/* tables */
.prose table{
  width:100%;border-collapse:separate;border-spacing:0;margin:1.5em 0;
  font-size:.95rem;background:var(--surface);border:1px solid var(--line);
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow);
}
.prose thead th{
  background:var(--accent-soft);color:var(--accent-deep);
  font-family:"IBM Plex Sans Thai",sans-serif;font-weight:600;text-align:left;
  padding:11px 15px;font-size:.9rem;
}
.prose tbody td{padding:11px 15px;border-top:1px solid var(--line);vertical-align:top}
.prose tbody tr:nth-child(even) td{background:#faf9fe}
.prose td code{font-size:.82em}

.prose mark{background:var(--hw-soft);color:#8a4b04;padding:.05em .35em;border-radius:5px;font-weight:600}

/* ---------- Code blocks (Pygments) ---------- */
.codehilite{
  margin:1.4em 0;background:var(--code-bg);border-radius:14px;
  border:1px solid #322d5c;overflow:hidden;box-shadow:var(--shadow-lift);
}
.codehilite pre{
  margin:0;padding:20px 22px;overflow-x:auto;
  font-size:.86rem;line-height:1.7;color:var(--code-ink);
  -webkit-text-size-adjust:100%;
}
.codehilite pre code{font-family:inherit;background:none;padding:0;color:inherit;font-size:1em}
.codehilite::-webkit-scrollbar,.codehilite pre::-webkit-scrollbar{height:9px}
.codehilite pre::-webkit-scrollbar-thumb{background:#4b447f;border-radius:9px}

/* token colors */
.codehilite .c,.codehilite .c1,.codehilite .cm,.codehilite .ch,.codehilite .cs{color:#8b87b8;font-style:italic}
.codehilite .k,.codehilite .kd,.codehilite .kn,.codehilite .kc,.codehilite .kr,.codehilite .kp{color:#c4b5fd}
.codehilite .kt{color:#5ed1e6}
.codehilite .s,.codehilite .s1,.codehilite .s2,.codehilite .sb,.codehilite .se,.codehilite .sc,.codehilite .dl{color:#9be8a3}
.codehilite .mi,.codehilite .mf,.codehilite .mh,.codehilite .il,.codehilite .m{color:#fbbf24}
.codehilite .nc,.codehilite .nn{color:#7dd3fc}
.codehilite .nf,.codehilite .fm{color:#93c5fd}
.codehilite .nb,.codehilite .bp{color:#c4b5fd}
.codehilite .nd{color:#f0abfc}
.codehilite .o,.codehilite .ow,.codehilite .p{color:#b9b4e0}
.codehilite .n,.codehilite .na,.codehilite .nx,.codehilite .nv,.codehilite .nl{color:#e7e5f5}
.codehilite .err{color:#fca5a5}

/* plain (unhighlighted) fenced block, e.g. ascii tree */
pre.plainblock,.prose>pre{
  margin:1.4em 0;background:var(--code-bg);color:var(--code-ink);
  border:1px solid #322d5c;border-radius:14px;padding:20px 22px;
  overflow-x:auto;font-size:.86rem;line-height:1.7;box-shadow:var(--shadow-lift);
}

/* ---------- TOC sidebar ---------- */
.toc-aside{position:sticky;top:78px;align-self:start;font-size:.9rem}
.toc-aside .toc-head{
  font-family:"IBM Plex Sans Thai",sans-serif;font-weight:600;font-size:.8rem;
  color:var(--faint);margin:0 0 10px;padding-left:14px;
}
.toc-aside nav{border-left:2px solid var(--line);max-height:calc(100vh - 120px);overflow:auto}
.toc-aside ul{list-style:none;margin:0;padding:0}
.toc-aside li{margin:0}
.toc-aside a{
  display:block;padding:5px 14px;color:var(--muted);text-decoration:none;
  border-left:2px solid transparent;margin-left:-2px;line-height:1.45;
}
.toc-aside a:hover{color:var(--ink)}
.toc-aside ul ul a{padding-left:26px;font-size:.94em;color:var(--faint)}
.toc-aside ul ul ul{display:none}
@media(max-width:1079px){
  .toc-aside{position:static;margin:0 0 8px}
  .toc-aside nav{border-left:0;max-height:none}
  .toc-details summary{
    cursor:pointer;font-family:"IBM Plex Sans Thai",sans-serif;font-weight:600;
    padding:12px 16px;background:var(--surface);border:1px solid var(--line);
    border-radius:12px;color:var(--ink);list-style:none;
  }
  .toc-details summary::-webkit-details-marker{display:none}
  .toc-details[open] summary{border-bottom-left-radius:0;border-bottom-right-radius:0}
  .toc-details .toc-aside{border:1px solid var(--line);border-top:0;
    border-radius:0 0 12px 12px;padding:8px 4px;background:var(--surface)}
}
.toc-desktop{display:block}
.toc-mobile{display:none}
@media(max-width:1079px){.toc-desktop{display:none}.toc-mobile{display:block;margin-bottom:24px}}

/* ---------- Prev / next footer ---------- */
.docnav{
  max-width:var(--maxw);margin:56px 0 0;padding-top:26px;
  border-top:1px solid var(--line-strong);
  display:flex;gap:14px;justify-content:space-between;flex-wrap:wrap;
}
.docnav a{
  flex:1 1 220px;text-decoration:none;padding:16px 18px;border-radius:14px;
  border:1px solid var(--line);background:var(--surface);color:var(--ink);
  box-shadow:var(--shadow);transition:border-color .15s,transform .15s;
}
.docnav a:hover{border-color:var(--accent);transform:translateY(-2px)}
.docnav .dir{font-size:.78rem;color:var(--muted);font-weight:500}
.docnav .ttl{font-family:"IBM Plex Sans Thai",sans-serif;font-weight:600;margin-top:3px}
.docnav a.next{text-align:right}

/* ---------- Footer ---------- */
.site-foot{border-top:1px solid var(--line);color:var(--muted);font-size:.88rem}
.site-foot .inner{max-width:1180px;margin:0 auto;padding:26px 24px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* ============================================================
   INDEX PAGE
   ============================================================ */
.hero{max-width:1180px;margin:0 auto;padding:60px 24px 30px}
.hero .eyebrow{color:var(--indigo);font-weight:600;font-family:"IBM Plex Sans Thai",sans-serif;
  margin:0 0 14px;font-size:1rem}
.hero h1{font-size:clamp(2.4rem,6vw,3.9rem);font-weight:700;margin:0;letter-spacing:-.02em;line-height:1.08}
.hero h1 .app{
  background:linear-gradient(120deg,var(--indigo),#8b5cf6);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .lead{font-size:1.2rem;color:var(--muted);max-width:60ch;margin:20px 0 0}
.hero .meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:26px;font-size:.95rem;color:var(--muted)}
.hero .meta b{color:var(--ink);font-weight:700}

.legend{max-width:1180px;margin:0 auto;padding:6px 24px 4px;
  display:flex;gap:22px;flex-wrap:wrap;font-size:.9rem;color:var(--muted)}
.legend .key{display:inline-flex;align-items:center;gap:8px}
.legend .dot{width:11px;height:11px;border-radius:4px}

/* roadmap timeline */
.roadmap{max-width:1180px;margin:0 auto;padding:26px 24px 70px}
.week{position:relative;padding-left:66px;padding-bottom:14px}
.week::before{ /* the spine */
  content:"";position:absolute;left:26px;top:8px;bottom:-14px;width:2px;background:var(--line-strong);
}
.week:last-child::before{display:none}
.week .node{
  position:absolute;left:8px;top:6px;width:38px;height:38px;border-radius:12px;
  display:grid;place-items:center;font-family:"IBM Plex Sans Thai",sans-serif;
  font-weight:700;font-size:1.05rem;background:var(--surface);
  border:2px solid var(--line-strong);color:var(--faint);z-index:1;
}
.week.open .node{background:linear-gradient(145deg,var(--indigo),#7c74f0);border-color:transparent;
  color:#fff;box-shadow:0 8px 20px -8px rgba(79,70,229,.75)}
.week .card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px 24px;box-shadow:var(--shadow);margin-bottom:16px;
}
.week.open .card{border-color:var(--line-strong)}
.week.locked .card{background:#fbfbfe;border-style:dashed}
.week .whead{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.week .wnum{flex:0 0 100%;font-size:.8rem;font-weight:600;color:var(--indigo);font-family:"IBM Plex Sans Thai",sans-serif;margin-bottom:2px}
.week.locked .wnum{color:var(--faint)}
.week h2{font-size:1.3rem;margin:2px 0 0;flex:1 1 auto}
.week.locked h2{color:var(--muted)}
.week .status{font-size:.78rem;font-weight:600;color:var(--faint);
  display:inline-flex;align-items:center;gap:6px;background:var(--bg);
  padding:5px 11px;border-radius:999px;border:1px solid var(--line)}
.week .status svg{width:13px;height:13px}
.week .wdesc{color:var(--muted);margin:12px 0 0;font-size:.98rem}

.doclinks{display:grid;gap:12px;margin-top:20px;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.doclink{
  display:flex;align-items:flex-start;gap:14px;text-decoration:none;color:var(--ink);
  padding:15px 16px;border-radius:14px;border:1px solid var(--line);
  background:var(--bg);transition:border-color .15s,transform .15s,background .15s;
}
.doclink:hover{transform:translateY(-2px)}
.doclink .ic{width:38px;height:38px;flex:none;border-radius:11px;display:grid;place-items:center}
.doclink .ic svg{width:19px;height:19px;color:#fff}
.doclink .tx{display:flex;flex-direction:column;min-width:0}
.doclink .t{display:block;font-family:"IBM Plex Sans Thai",sans-serif;font-weight:600;line-height:1.35}
.doclink .d{display:block;font-size:.82rem;color:var(--muted);margin-top:3px;line-height:1.4}
.doclink .go{margin-left:auto;align-self:center;color:var(--faint)}
.doclink .go svg{width:18px;height:18px}

.doclink.lesson:hover{border-color:var(--indigo);background:var(--indigo-soft)}
.doclink.lesson .ic{background:var(--indigo)}
.doclink.lab:hover{border-color:var(--lab);background:var(--lab-soft)}
.doclink.lab .ic{background:var(--lab)}
.doclink.hw:hover{border-color:var(--hw);background:var(--hw-soft)}
.doclink.hw .ic{background:var(--hw)}

@media(max-width:560px){
  body{font-size:16.5px}
  .hero{padding-top:40px}
  .week{padding-left:56px}
  .week::before{left:22px}
  .week .node{width:32px;height:32px;left:6px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* โน้ต "เอกสารที่ยังไม่มา" ในการ์ดสัปดาห์ที่เปิดแต่ยังไม่ครบ */
.week .soon-note{
  display:flex;align-items:center;gap:8px;margin:14px 0 0;
  font-size:.86rem;color:var(--faint);
}
.week .soon-note svg{width:14px;height:14px;flex:none}

/* โหมดข้อสอบ — accent ชมพูเข้ม แยกจากบทเรียน */
.page-exam{--accent:#be123c;--accent-soft:#fde7ec;--accent-deep:#9f1239}
.exam-meta{display:flex;gap:20px;flex-wrap:wrap;margin:2px 0 4px;font-size:.92rem;color:var(--muted)}
.exam-meta b{color:var(--ink);font-weight:700}