/* ห้องติวของนารา — โทนสมุดการบ้าน ตัวหนังสือใหญ่ อ่านง่ายสำหรับเด็ก ป.3
   ตั้งใจใช้ธีมสว่างธีมเดียว (กำหนดสีพื้นและสีตัวอักษรเองทั้งหมด) */
:root {
  --paper: #fbfaf4;
  --grid: #e9eef7;
  --card: #ffffff;
  --ink: #1f2544;
  --muted: #5d6385;
  --line: #dfe3ef;
  --sun: #ffb81c;
  --sun-ink: #7a5200;
  --ok: #1f8f55;
  --ok-bg: #e2f5ea;
  --no: #cf3b3b;
  --no-bg: #fde9e7;
  --pick: #3b63d6;
  --warn-bg: #fff1dc;
  --c: #3b63d6;
  --radius: 16px;
  --lift: 0 2px 0 rgba(31, 37, 68, .08), 0 6px 18px rgba(31, 37, 68, .07);
  --f-ui: 'Mali', 'Leelawadee UI', 'Thonburi', 'Sarabun', system-ui, sans-serif;
  --f-read: 'Sarabun', 'Leelawadee UI', 'Thonburi', system-ui, sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--f-ui);
  font-size: 18px;
  line-height: 1.6;
}
#app { max-width: 760px; margin: 0 auto; padding: 20px 16px 64px; }
h1, h2, h3 { text-wrap: balance; line-height: 1.3; margin: 0; }
button { font: inherit; color: inherit; cursor: pointer; }
button:focus-visible { outline: 3px solid var(--pick); outline-offset: 2px; }
button:disabled { cursor: default; }

/* ---------- home ---------- */
.hero { padding: 8px 0 20px; }
.hello { margin: 0; font-size: 20px; color: var(--muted); }
.hero h1 { font-size: clamp(30px, 7vw, 42px); font-weight: 700; }
.sub { margin: 2px 0 14px; color: var(--muted); font-size: 16px; }
.starbank {
  display: inline-flex; align-items: baseline; gap: 8px;
  background: var(--card); border: 2px solid var(--sun); border-radius: 999px;
  padding: 4px 18px; font-size: 24px; font-weight: 700; color: var(--sun-ink);
}
.starbank span { color: var(--sun); }
.starbank small { font-size: 15px; font-weight: 400; color: var(--muted); }

.synccard {
  margin-top: 14px; background: var(--card); border: 2px dashed #9db4ea; border-radius: var(--radius);
  padding: 12px 14px; max-width: 460px;
}
.synccard p { margin: 0; }
.synccard small { color: var(--muted); }
.pinrow { display: flex; gap: 8px; margin-top: 8px; }
.pinrow input {
  flex: 1; min-width: 0; font: inherit; font-size: 22px; letter-spacing: 6px; text-align: center;
  border: 2px solid var(--line); border-radius: 12px; padding: 6px 10px; background: #fff; color: var(--ink);
}
.pinrow input:focus { outline: 3px solid var(--pick); outline-offset: 1px; }
.pinerr { color: var(--no); margin-top: 6px !important; font-size: 15px; }
.syncpill { margin: 12px 0 0; font-size: 15px; color: var(--ok); }
.syncpill.offline { color: #b04a00; }
.day { margin-top: 22px; }
.dayhead { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-bottom: 10px; }
.dayhead h2 { font-size: 21px; }
.count { font-size: 15px; font-weight: 700; padding: 2px 12px; border-radius: 999px; background: #e7ebf7; color: var(--muted); }
.count.hot { background: var(--no); color: #fff; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.subj {
  display: flex; flex-direction: column; align-items: flex-start; gap: 2px; text-align: left;
  background: var(--card); border: 2px solid var(--line); border-bottom: 5px solid var(--c);
  border-radius: var(--radius); padding: 14px 16px 12px; box-shadow: var(--lift);
  transition: transform .12s ease;
}
.subj:hover { transform: translateY(-2px); }
.subj .ic { font-size: 34px; line-height: 1.2; }
.subj .nm { font-size: 21px; font-weight: 700; color: var(--c); }
.subj .tm { font-size: 14px; color: var(--muted); }
.subj .prog { width: 100%; height: 8px; border-radius: 99px; background: #eef0f6; margin: 8px 0 2px; overflow: hidden; }
.subj .prog i { display: block; height: 100%; background: var(--c); border-radius: 99px; }
.subj .meta { font-size: 14px; color: var(--muted); }
.subj.soon { border-bottom-style: dashed; }
.subj.soon .nm { color: var(--muted); }

.foot { margin-top: 36px; text-align: center; font-size: 15px; color: var(--muted); }
.linkbtn { background: none; border: 0; color: var(--pick); text-decoration: underline; font-size: 16px; padding: 6px; }

/* ---------- subject / lesson ---------- */
.back {
  background: none; border: 0; padding: 6px 0; font-size: 17px; color: var(--muted);
}
.back:hover { color: var(--ink); }
.shead { display: flex; gap: 14px; align-items: center; margin: 8px 0 18px; }
.shead .ic {
  font-size: 36px; width: 64px; height: 64px; flex: none; display: grid; place-items: center;
  background: var(--card); border: 3px solid var(--c); border-radius: 18px;
}
.shead h1 { font-size: clamp(26px, 6vw, 34px); color: var(--c); }
.shead p { margin: 0; color: var(--muted); font-size: 16px; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 18px; }
.btn {
  border: 0; border-radius: 12px; padding: 8px 16px; font-weight: 600; font-size: 17px;
  background: var(--c); color: #fff; box-shadow: 0 3px 0 rgba(0, 0, 0, .18);
}
.btn:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(0, 0, 0, .18); }
.btn.big { padding: 12px 20px; font-size: 18px; border-radius: 14px; }
.btn.big small { font-weight: 400; opacity: .9; }
.btn.alt { background: var(--card); color: var(--c); border: 2px solid var(--c); box-shadow: none; }
.btn.ghost { background: var(--card); color: var(--ink); border: 2px solid var(--line); box-shadow: none; }
.btn.danger { color: var(--no); }
.btn.full { width: 100%; }
.btn:disabled { opacity: .45; }

.unit { font-size: 17px; color: var(--muted); margin: 18px 0 8px; font-weight: 600; }
.topics { display: flex; flex-direction: column; gap: 10px; }
.topics .unit:first-child { margin-top: 0; }
.topic {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 12px 14px;
}
.tnum {
  width: 34px; height: 34px; flex: none; border-radius: 50%; display: grid; place-items: center;
  background: var(--c); color: #fff; font-weight: 700; font-size: 16px;
}
.tbody { flex: 1 1 200px; min-width: 0; }
.tbody b { font-size: 18px; }
.tmeta { font-size: 15px; color: var(--muted); }
.new { color: var(--muted); }
.tact { display: flex; gap: 8px; }
.focus {
  display: inline-block; font-size: 13px; font-weight: 700; padding: 0 8px; border-radius: 6px;
  background: var(--warn-bg); color: #b04a00; border: 1px solid #f3c58f; vertical-align: middle;
}
.tdoc {
  display: inline-block; font-size: 13px; font-weight: 700; padding: 0 8px; border-radius: 6px;
  background: #e8f1ff; color: #2455b8; border: 1px solid #b9cff5; vertical-align: middle;
}
.teacher {
  background: #eef4ff; border-left: 5px solid #3b63d6; border-radius: 10px;
  padding: 10px 14px; margin: 12px 0; font-size: 18px;
}
.stars b { color: var(--sun); font-weight: 400; }
.stars i { color: #d9dce8; font-style: normal; }

.soonbox { background: var(--card); border: 2px dashed var(--line); border-radius: var(--radius); padding: 16px 20px; }
.soonbox p { margin: 0 0 8px; }

.lesson {
  background: var(--card); border: 2px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; margin-bottom: 16px; font-family: var(--f-read); font-size: 19px; line-height: 1.75;
}
.lesson .eyebrow { margin: 0; font-family: var(--f-ui); font-size: 14px; color: var(--muted); letter-spacing: .02em; }
.lesson h1 { font-family: var(--f-ui); font-size: clamp(24px, 5.5vw, 30px); color: var(--c); margin-bottom: 12px; }
.lesson h3 { font-family: var(--f-ui); font-size: 20px; margin: 18px 0 6px; color: var(--c); }
.lesson p { margin: 8px 0; }
.lesson ul { padding-left: 22px; margin: 8px 0; }
.lesson u { text-decoration-color: var(--c); text-decoration-thickness: 2px; }
.ex {
  display: inline-block; background: #f1f4fb; border: 1px solid var(--line); border-radius: 8px;
  padding: 0 8px; margin: 2px 2px; font-weight: 600;
}
.tip {
  background: var(--warn-bg); border-left: 5px solid var(--sun); border-radius: 10px;
  padding: 10px 14px; margin: 12px 0; font-size: 18px;
}
.tbl { overflow-x: auto; margin: 10px 0; }
table { border-collapse: collapse; width: 100%; font-size: 17px; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: #f1f4fb; font-family: var(--f-ui); font-weight: 600; }
tr.weak td { background: var(--warn-bg); }
tr.none td { color: var(--muted); }

.flow { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 10px 0; }
.flow span {
  position: relative; background: #f1f4fb; border: 2px solid var(--c); border-radius: 12px;
  padding: 4px 12px; font-family: var(--f-ui); font-size: 16px; text-align: center; line-height: 1.4;
}
.flow span + span::before {
  content: '→'; position: absolute; left: -19px; top: 50%; transform: translateY(-50%); color: var(--c); font-weight: 700;
}
.formula { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; margin: 8px 0; }
.formula div { background: #f1f4fb; border-radius: 12px; padding: 8px 12px; text-align: center; font-family: var(--f-ui); }
.formula b { display: block; font-size: 18px; }
.formula span { color: var(--c); font-weight: 700; font-size: 22px; }
.pie-wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin: 10px 0; }
.pie-wrap svg { max-width: 100%; height: auto; transform: none; }
.legend { list-style: none; padding: 0 !important; margin: 0; font-size: 17px; }
.legend i { display: inline-block; width: 14px; height: 14px; border-radius: 4px; margin-right: 8px; vertical-align: -1px; }
.aqi { display: flex; flex-wrap: wrap; gap: 6px; }
.aqi span { flex: 1 1 90px; color: #fff; border-radius: 10px; padding: 6px 8px; text-align: center; font-family: var(--f-ui); font-size: 15px; line-height: 1.35; font-weight: 600; }

/* ---------- math & english helpers ---------- */
.frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; line-height: 1.15; font-weight: 700; margin: 0 3px; }
.frac span:first-child { border-bottom: 2px solid currentColor; padding: 0 4px; }
.fbar { display: inline-flex; width: min(320px, 100%); height: 38px; border: 2px solid var(--ink); border-radius: 6px; overflow: hidden; vertical-align: middle; }
.fbar i { flex: 1; border-right: 2px solid var(--ink); }
.fbar i:last-child { border-right: 0; }
.fbar i.on { background: var(--c); }
.clock, .shape { display: block; max-width: 100%; height: auto; }
.qtext .clock { margin: 4px auto 8px; }
.shapes { display: flex; flex-wrap: wrap; gap: 12px 18px; margin: 10px 0; }
.shapes figure { margin: 0; text-align: center; font-family: var(--f-ui); font-size: 15px; color: var(--muted); }
.shapes figure .shape, .shapes figure .clock { margin: 0 auto 2px; }
.bigchar { font-size: 40px; font-weight: 700; line-height: 1; font-family: 'Sarabun', system-ui, sans-serif; }
.pic { font-size: 44px; line-height: 1.1; display: inline-block; vertical-align: middle; margin-right: 6px; }
.picto { font-family: var(--f-read); font-weight: 400; font-size: 17px; background: #f6f8fd; border-radius: 12px; padding: 8px 12px; margin-bottom: 10px; }
.picto .cap { margin: 0; font-weight: 700; text-align: center; }
.picto .key { margin: 4px 0 0; font-size: 15px; color: var(--muted); }
.picto td:last-child { letter-spacing: 2px; }
.calc { font-family: ui-monospace, 'Consolas', monospace; font-size: 20px; background: #f6f8fd; border-radius: 10px; padding: 8px 16px; display: inline-block; margin: 4px 12px 4px 0; line-height: 1.4; }
.words { display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 8px 0; }
.words > span { font-family: var(--f-ui); font-size: 16px; }
.words .th { color: var(--muted); }
.say {
  border: 2px solid var(--c); background: var(--card); color: var(--c); border-radius: 999px;
  padding: 1px 12px; font-family: var(--f-ui); font-weight: 600; font-size: 17px; margin: 2px 0;
}
.say:active { background: var(--c); color: #fff; }

/* ---------- quiz ---------- */
.qbar { display: flex; align-items: center; gap: 12px; }
.x { background: var(--card); border: 2px solid var(--line); border-radius: 50%; width: 40px; height: 40px; flex: none; font-size: 18px; }
.track { flex: 1; height: 14px; background: #e6e9f3; border-radius: 99px; overflow: hidden; }
.track i { display: block; height: 100%; background: var(--c); border-radius: 99px; transition: width .3s ease; }
.qn { font-weight: 700; font-variant-numeric: tabular-nums; min-width: 52px; text-align: right; }
.qtitle { margin: 10px 0 8px; color: var(--muted); font-size: 16px; }
.qcard {
  position: relative; background: var(--card); border: 2px solid var(--line); border-radius: var(--radius);
  padding: 18px 58px 18px 20px; box-shadow: var(--lift);
}
.qtext { font-size: 22px; line-height: 1.6; font-weight: 600; }
.qtext b { color: var(--c); }
.passage {
  font-family: var(--f-read); font-weight: 400; font-size: 19px; line-height: 1.75;
  background: #f6f8fd; border-radius: 12px; padding: 10px 14px; margin-bottom: 10px;
}
.sign { font-size: 72px; line-height: 1.1; }
.speak {
  position: absolute; right: 10px; top: 10px; width: 40px; height: 40px; border-radius: 50%;
  border: 2px solid var(--line); background: var(--card); font-size: 18px;
}
.choices { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.choice {
  display: flex; align-items: center; gap: 12px; text-align: left; min-height: 60px;
  background: var(--card); border: 3px solid var(--line); border-radius: 14px; padding: 8px 14px;
  font-size: 20px; transition: border-color .1s ease, background-color .1s ease;
}
.choice:not(:disabled):hover { border-color: var(--c); }
.choice .lab {
  width: 34px; height: 34px; flex: none; border-radius: 50%; display: grid; place-items: center;
  background: #eef0f6; font-weight: 700; font-size: 17px;
}
.choice.right { border-color: var(--ok); background: var(--ok-bg); }
.choice.right .lab { background: var(--ok); color: #fff; }
.choice.wrong { border-color: var(--no); background: var(--no-bg); }
.choice.wrong .lab { background: var(--no); color: #fff; }
.choice.picked { border-color: var(--pick); background: #e8eefc; }
.choice.picked .lab { background: var(--pick); color: #fff; }
.choice:disabled:not(.right):not(.wrong):not(.picked) { opacity: .6; }
.feedback { margin-top: 14px; display: flex; flex-direction: column; gap: 12px; }
.fbbox { border-radius: 14px; padding: 12px 16px; font-size: 19px; }
.fbbox.ok { background: var(--ok-bg); border: 2px solid var(--ok); }
.fbbox.ok b { color: var(--ok); }
.fbbox.no { background: var(--no-bg); border: 2px solid var(--no); }
.fbbox.no b { color: var(--no); }
.fbbox p { margin: 4px 0 0; font-family: var(--f-read); }

.result { text-align: center; background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 20px 16px; margin-bottom: 16px; box-shadow: var(--lift); }
.bigstars { font-size: 54px; line-height: 1.1; letter-spacing: 6px; }
.score { margin: 6px 0 0; font-size: 22px; font-variant-numeric: tabular-nums; }
.score b { font-size: 44px; color: var(--c); }
.score span { color: var(--muted); }
.msg { margin: 4px 0 0; font-size: 22px; font-weight: 700; }
.result + .actions .btn { flex: 1 1 220px; }
.revh { font-size: 21px; margin: 18px 0 10px; }
.rev { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 10px; }
.rev .qtext { font-size: 19px; }
.rev .passage { font-size: 17px; }
.rev p { margin: 6px 0 0; }
.rev .yours { color: var(--no); }
.rev .right { color: var(--ok); font-weight: 700; }
.rev .why { font-family: var(--f-read); color: var(--muted); }

/* ---------- parent ---------- */
.pcard { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 14px; }
.pcard h2 { font-size: 20px; color: var(--c); }
.pcard h2 small { display: block; font-size: 15px; color: var(--muted); font-weight: 400; }

/* ---------- confetti ---------- */
.confetti { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 10; }
.confetti span { position: absolute; top: -40px; animation: fall 2.6s ease-in forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(540deg); opacity: .7; } }

@media (max-width: 480px) {
  body { font-size: 17px; }
  .qtext { font-size: 20px; }
  .choice { font-size: 18px; }
  .lesson { padding: 16px; font-size: 18px; }
  .tact { width: 100%; }
  .tact .btn { flex: 1; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}