/* CoDee — สไตล์หลัก (mobile-first) */
:root {
  --ink: #1D2550;
  --ink-2: #4A5378;
  --ink-3: #8A92B2;
  --paper: #F5F7FB;
  --card: #FFFFFF;
  --line: #E3E7F1;
  --blue: #2A6AB0;
  --blue-soft: #E6EFFA;
  --sun: #F5B00A;
  --gold: #C98A00;
  --sun-soft: #FFF4D1;
  --green: #1F9D55;
  --green-soft: #E3F5EA;
  --coral: #E0484B;
  --coral-soft: #FDE8E8;
  --radius: 14px;
  --radius-sm: 10px;
  --head: "Bai Jamjuree", "IBM Plex Sans Thai", system-ui, sans-serif;
  --body: "IBM Plex Sans Thai", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --nav-h: 64px;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body { font-family: var(--body); font-size: 17px; line-height: 1.6; -webkit-text-size-adjust: 100%; }
h1, h2, h3 { font-family: var(--head); font-weight: 700; line-height: 1.3; margin: 0 0 .5em; letter-spacing: -.005em; }
h2, h3 { font-weight: 600; }
h1 { font-size: 1.6rem; } h2 { font-size: 1.3rem; } h3 { font-size: 1.1rem; }
p { margin: 0 0 .8em; }
a { color: var(--blue); }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; }
.hidden { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- โครงหน้า ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--paper); border-bottom: 1px solid var(--line);
}
.brand { display: block; line-height: 0; }
.brand img { height: 30px; width: auto; }
@media (max-width: 430px) { body:not(.dash) .brand img { height: 38px; width: 38px; margin: -4px 0; } .topstats { gap: 6px; font-size: .85rem; } .topstats .chip { padding: 4px 8px; } }
.topstats { margin-left: auto; display: flex; align-items: center; gap: 10px; font-size: .9rem; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); white-space: nowrap; }
.chip svg { width: 16px; height: 16px; }
.help-btn { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); cursor: pointer; font-family: var(--head); }

main { max-width: 720px; margin: 0 auto; padding: 16px 16px calc(var(--nav-h) + 24px); }

.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 20; height: var(--nav-h);
  display: flex; justify-content: space-around; background: var(--card); border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; text-decoration: none; color: var(--ink-3); font-size: .78rem; }
.tabbar a svg { width: 24px; height: 24px; }
.tabbar a.on { color: var(--blue); }

footer.site { text-align: center; font-size: .8rem; color: var(--ink-3); padding: 8px 0 0; }

/* ---------- ปุ่มและฟอร์ม ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 10px 20px;
  border-radius: var(--radius-sm); border: 0; cursor: pointer; font-family: var(--head); font-size: 1.02rem; font-weight: 600;
  background: var(--blue); color: #fff; text-decoration: none;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--blue); border: 1.5px solid var(--blue); }
.btn.sun { background: var(--sun); color: var(--ink); }
.btn.block { width: 100%; }
.btn.small { min-height: 38px; padding: 6px 14px; font-size: .9rem; }
.field { display: block; margin: 0 0 16px; }
.field > span { display: block; font-size: .92rem; color: var(--ink-2); margin-bottom: 6px; }
.input { width: 100%; min-height: 48px; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: var(--radius-sm); background: var(--card); font-size: 1.05rem; }
.input:focus { border-color: var(--blue); outline: none; }
.seg { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.seg button { min-height: 44px; border: 1.5px solid var(--line); border-radius: var(--radius-sm); background: var(--card); cursor: pointer; }
.seg.two { grid-template-columns: 1fr 1fr; }
#beT summary { list-style: none; }
#beT summary::-webkit-details-marker { display: none; }
#beT[open] summary { margin-bottom: 4px; }
.seg button.on { border-color: var(--blue); background: var(--blue-soft); color: var(--blue); font-weight: 600; }
.note { font-size: .88rem; color: var(--ink-2); }
.err { color: var(--coral); font-size: .92rem; min-height: 1.4em; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }

/* ---------- หน้าเข้าสู่ระบบ ---------- */
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.login-box { width: 100%; max-width: 420px; }
.login-logo { display: block; width: min(300px, 80%); height: auto; margin: 0 0 14px -4px; }
.login .lead { font-size: 1.1rem; color: var(--ink-2); margin-bottom: 1.6em; }
.login .route { margin: 0 0 28px; padding: 0; list-style: none; position: relative; }
.login .route::before { content: ""; position: absolute; left: 11px; top: 12px; bottom: 12px; width: 6px; border-radius: 3px; background: linear-gradient(var(--blue), var(--sun)); }
.login .route li { position: relative; padding: 6px 0 6px 40px; }
.login .route li::before { content: ""; position: absolute; left: 4px; top: 11px; width: 20px; height: 20px; border-radius: 50%; background: var(--card); border: 5px solid var(--blue); }
.login .route li:last-child::before { border-color: var(--sun); }
.gbtn { background: var(--ink); }

/* ---------- แผนที่ด่าน (เส้นทางรถไฟฟ้า) ---------- */
.hello { margin-bottom: 18px; }
.hello p { color: var(--ink-2); margin: 0; }
.metro { position: relative; margin: 8px 0 0; padding: 0; list-style: none; }
.metro::before { content: ""; position: absolute; left: 21px; top: 26px; bottom: 26px; width: 8px; border-radius: 4px; background: var(--line); }
.metro .fill { position: absolute; left: 21px; top: 26px; width: 8px; border-radius: 4px; background: linear-gradient(var(--blue), var(--sun)); }
.station { position: relative; padding: 0 0 18px 64px; }
.station .dot {
  position: absolute; left: 7px; top: 8px; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--head); font-weight: 600; font-size: 1rem; background: var(--card); border: 6px solid var(--blue); color: var(--ink);
}
.station.locked .dot { border-color: var(--line); color: var(--ink-3); }
.station.done .dot { background: var(--blue); color: #fff; }
.station.current .dot { border-color: var(--sun); box-shadow: 0 0 0 6px var(--sun-soft); }
.station-head { width: 100%; text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; cursor: pointer; display: block; }
.station.locked .station-head { background: transparent; cursor: default; }
.station-head h3 { margin: 0; font-size: 1.05rem; }
.station-head .sub { color: var(--ink-2); font-size: .88rem; }
.station.locked h3, .station.locked .sub { color: var(--ink-3); }
.bar { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; margin-top: 8px; }
.bar > i { display: block; height: 100%; background: var(--blue); border-radius: 4px; transition: width .5s ease; }
.bar.green > i { background: var(--green); }
.stops { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 8px; }
.stop { display: grid; grid-template-columns: 44px 1fr auto; align-items: center; gap: 10px; padding: 10px 12px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); text-decoration: none; color: inherit; }
.stop .code { font-family: var(--head); color: var(--blue); }
.stop .t { font-size: .97rem; }
.stop .pct { font-size: .85rem; color: var(--ink-2); }
.stop.empty { opacity: .55; pointer-events: none; }
.stop .bar { margin-top: 4px; height: 6px; }

/* ---------- หน้าทักษะ ---------- */
.back { display: inline-flex; align-items: center; gap: 4px; color: var(--ink-2); text-decoration: none; font-size: .92rem; margin-bottom: 8px; }
.skill-head h1 { font-size: 1.35rem; margin-bottom: .2em; }
.skill-head .sub { color: var(--ink-2); font-size: .92rem; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin: 14px 0 6px; padding: 0; list-style: none; counter-reset: s; }
.steps li { counter-increment: s; text-align: center; font-size: .78rem; color: var(--ink-3); padding-top: 34px; position: relative; }
.steps li::before { content: counter(s); position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--card); border: 2px solid var(--line); font-family: var(--head); color: var(--ink-3); }
.steps li.on { color: var(--ink); font-weight: 600; }
.steps li.on::before { border-color: var(--blue); color: var(--blue); }
.steps li.ok::before { background: var(--blue); border-color: var(--blue); color: #fff; }
.steps li.lock::before { content: "🔒"; font-size: .8rem; }
.mastery-line { display: flex; align-items: center; gap: 10px; font-size: .9rem; color: var(--ink-2); margin: 6px 0 16px; }
.mastery-line .bar { flex: 1; margin: 0; }

/* บัตรความรู้ */
.lesson-card { min-height: 260px; }
.lesson-card h2 { font-size: 1.2rem; }
.lesson-nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 14px; }
.pager { display: flex; gap: 6px; }
.pager i { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.pager i.on { background: var(--blue); }

/* โจทย์ */
.q-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.tag { font-size: .8rem; padding: 2px 10px; border-radius: 999px; background: var(--blue-soft); color: var(--blue); }
.tag.ct { background: var(--sun-soft); color: #8A6500; }
.tag.lv { background: var(--paper); color: var(--ink-2); border: 1px solid var(--line); }
.q-title { font-size: 1.15rem; }
.q-body { font-size: 1.02rem; }
.choices { display: grid; gap: 10px; margin: 16px 0 0; padding: 0; list-style: none; }
.choice {
  width: 100%; text-align: left; display: grid; grid-template-columns: 34px 1fr; gap: 10px; align-items: center;
  min-height: 54px; padding: 10px 14px; border-radius: var(--radius-sm); border: 2px solid var(--line); background: var(--card); cursor: pointer;
}
.choice .k { width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; background: var(--paper); font-family: var(--head); color: var(--ink-2); }
.choice .tx { font-family: var(--mono); font-size: .95rem; white-space: pre-wrap; word-break: break-word; }
.choice .tx.th { font-family: var(--body); font-size: 1rem; }
.choice.sel { border-color: var(--blue); background: var(--blue-soft); }
.choice.sel .k { background: var(--blue); color: #fff; }
.choice.right { border-color: var(--green); background: var(--green-soft); }
.choice.right .k { background: var(--green); color: #fff; }
.choice.wrong { border-color: var(--coral); background: var(--coral-soft); }
.choice.wrong .k { background: var(--coral); color: #fff; }
.choice:disabled { cursor: default; }
.fill { margin-top: 16px; }
.fill .input { font-family: var(--mono); }
.q-actions { display: flex; gap: 10px; margin-top: 18px; }
.q-actions .btn { flex: 1; }
.hint-box { margin-top: 14px; padding: 12px 14px; border-radius: var(--radius-sm); background: var(--sun-soft); border-left: 5px solid var(--sun); }
.hint-box .who { font-family: var(--head); font-size: .9rem; color: #8A6500; margin-bottom: 2px; }

/* แผ่นผลลัพธ์ */
.sheet-back { position: fixed; inset: 0; background: rgba(29, 37, 80, .28); z-index: 30; }
.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 31; max-height: 82vh; overflow: auto;
  background: var(--card); border-radius: 20px 20px 0 0; padding: 20px 16px calc(20px + env(safe-area-inset-bottom));
  transform: translateY(0); animation: up .28s ease-out;
}
.sheet-inner { max-width: 720px; margin: 0 auto; }
@keyframes up { from { transform: translateY(100%); } }
.sheet.ok { border-top: 6px solid var(--green); }
.sheet.no { border-top: 6px solid var(--coral); }
.sheet h2 { margin-bottom: .3em; }
.sheet.ok h2 { color: var(--green); }
.sheet.no h2 { color: var(--coral); }
.gain { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 14px; }
.gain .chip { background: var(--paper); }
.explain { background: var(--paper); border-radius: var(--radius-sm); padding: 12px 14px; margin: 10px 0; }
.ai-reply { background: var(--blue-soft); border-radius: var(--radius-sm); padding: 12px 14px; margin: 10px 0; }
.ai-reply .who { font-family: var(--head); color: var(--blue); font-size: .9rem; }
.ai-report { background: none; border: 0; color: var(--ink-3); font-size: .8rem; cursor: pointer; padding: 4px 0 0; text-decoration: underline; }

/* Markdown */
.md pre { background: #1D2550; color: #EDEFF7; padding: 12px 14px; border-radius: var(--radius-sm); overflow-x: auto; font-family: var(--mono); font-size: .9rem; line-height: 1.55; margin: 8px 0 12px; }
.md pre.out { background: var(--paper); color: var(--ink); border: 1px dashed var(--ink-3); }
.md code { font-family: var(--mono); font-size: .92em; background: var(--blue-soft); color: var(--ink); padding: 1px 5px; border-radius: 5px; }
.md pre code { background: none; color: inherit; padding: 0; }
.md ul { padding-left: 1.2em; margin: 0 0 .8em; }
.md h2 { font-size: 1.15rem; }
.tok-k { color: #FFC93C; } .tok-s { color: #8EE3A8; } .tok-n { color: #9CC8FF; } .tok-c { color: #8A92B2; font-style: italic; } .tok-f { color: #F7A8D0; }

/* สรุปและโปรไฟล์ */
.done-box { text-align: center; padding: 28px 18px; }
.done-box .big { font-family: var(--head); font-size: 2.6rem; color: var(--blue); line-height: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px; }
.stat b { display: block; font-family: var(--head); font-size: 1.5rem; font-weight: 500; }
.stat span { font-size: .85rem; color: var(--ink-2); }
.ct-rows { display: grid; gap: 10px; }
.ct-row { display: grid; grid-template-columns: 130px 1fr 44px; align-items: center; gap: 10px; font-size: .92rem; }
.ct-row .bar { margin: 0; }
.badges { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 10px; }
.badge { text-align: center; padding: 10px 6px; border-radius: var(--radius-sm); background: var(--card); border: 1px solid var(--line); font-size: .82rem; }
.badge .ic { width: 46px; height: 46px; margin: 0 auto 6px; border-radius: 50%; display: grid; place-items: center; background: var(--sun-soft); font-size: 1.4rem; }
.badge.off { opacity: .4; }
.badge.off .ic { background: var(--paper); filter: grayscale(1); }
.section { margin: 22px 0; }
.section > h2 { font-size: 1.1rem; }

/* กระดานผู้นำ */
.board { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.board li { display: grid; grid-template-columns: 36px 1fr auto; gap: 10px; align-items: center; padding: 10px 14px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.board li.me { border-color: var(--blue); background: var(--blue-soft); }
.board .rank { font-family: var(--head); font-size: 1.1rem; color: var(--ink-2); text-align: center; }
.board li:nth-child(1) .rank { color: #C99400; }
.board .nm small { display: block; color: var(--ink-3); font-size: .8rem; }
.board .xp { font-family: var(--head); }

/* ป๊อปอัป เหรียญ/เลเวล */
.toast { position: fixed; left: 50%; top: 70px; transform: translateX(-50%); z-index: 50; background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 999px; font-size: .95rem; animation: pop .3s ease-out; max-width: calc(100% - 32px); }
@keyframes pop { from { opacity: 0; transform: translate(-50%, -10px); } }
.modal-back { position: fixed; inset: 0; z-index: 60; background: rgba(29, 37, 80, .5); display: grid; place-items: center; padding: 16px; }
.modal { background: var(--card); border-radius: 20px; padding: 24px 20px; max-width: 360px; width: 100%; text-align: center; }
.modal .ic { width: 84px; height: 84px; margin: 0 auto 10px; border-radius: 50%; display: grid; place-items: center; background: var(--sun-soft); font-size: 2.4rem; }

.faq details { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; margin-bottom: 8px; }
.faq summary { cursor: pointer; font-family: var(--head); }
.loading { color: var(--ink-3); text-align: center; padding: 40px 0; }

@media (min-width: 760px) {
  body { font-size: 18px; }
  .topbar { padding: 12px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}