/* ==========================================================
   NIHONGO M4-M6 — Eye-care Theme
   Light = กระดาษเซเปีย (ลดแสงฟ้า)  |  Dark = เทาอมน้ำเงินนุ่ม
   ========================================================== */

:root{
  --bg:#F3EEE3;        --bg2:#EBE4D6;      --card:#FBF7EE;
  --ink:#3A352C;       --ink2:#6B6354;     --line:#DED5C2;
  --brand:#4C8C7B;     --brand2:#3C7265;   --accent:#A6794C;
  --ok:#3F7D4E;        --bad:#B04A3D;      --warn:#B5853B;
  --shadow:0 2px 10px rgba(90,75,45,.10);
  --r:14px;  --r2:22px;
  --fs:16.5px;  --lh:1.85;
  --nav-h:62px;
}
html[data-theme="dark"]{
  --bg:#171A1F;        --bg2:#1F242B;      --card:#222830;
  --ink:#D8D2C6;       --ink2:#9AA2AE;     --line:#333B45;
  --brand:#6FB3A0;     --brand2:#86C7B4;   --accent:#D2A878;
  --ok:#6FBF85;        --bad:#E08274;      --warn:#D9B169;
  --shadow:0 2px 12px rgba(0,0,0,.40);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:"Sarabun","Noto Sans Thai","Noto Sans JP",-apple-system,
              "Segoe UI",system-ui,sans-serif;
  font-size:var(--fs); line-height:var(--lh);
  padding-bottom:calc(var(--nav-h) + 18px);
  transition:background .25s ease,color .25s ease;
  -webkit-text-size-adjust:100%;
}
/* ---------- โหมดอ่านสบายตา (ขยายตัวอักษร) ---------- */
html[data-read="big"] body{--fs:18.5px;--lh:2}
html[data-read="xl"]  body{--fs:21px;--lh:2.05}

a{color:var(--brand2);text-decoration:none}
h1,h2,h3,h4{line-height:1.45;margin:0 0 .5em}
h1{font-size:1.42rem} h2{font-size:1.2rem} h3{font-size:1.06rem}
.jp,.jp-word,.ex-jp,.kana{font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}

/* ---------- Layout ---------- */
.wrap{max-width:860px;margin:0 auto;padding:0 14px}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;background:var(--card);
  border-bottom:1px solid var(--line);box-shadow:var(--shadow);
}
.topbar .in{max-width:860px;margin:0 auto;padding:9px 14px;
  display:flex;align-items:center;gap:10px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink)}
.brand .logo{
  width:38px;height:38px;border-radius:12px;background:var(--brand);
  color:#fff;display:grid;place-items:center;font-size:19px;flex:none;
  font-family:"Noto Sans JP",sans-serif;
}
.brand small{display:block;font-weight:400;font-size:.68rem;color:var(--ink2);line-height:1.3}
.tb-act{margin-left:auto;display:flex;gap:6px}
.iconbtn{
  width:40px;height:40px;border-radius:12px;border:1px solid var(--line);
  background:var(--bg2);color:var(--ink);font-size:17px;cursor:pointer;
  display:grid;place-items:center;transition:.18s;
}
.iconbtn:active{transform:scale(.92)}
.iconbtn.on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ---------- Cards ---------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r2);
  padding:16px;margin:14px 0;box-shadow:var(--shadow);
}
.card.pad-s{padding:12px}
.card h2:first-child,.card h3:first-child{margin-top:0}

/* ---------- Grid เมนูระดับ ---------- */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:620px){.grid{grid-template-columns:repeat(3,1fr)}}
.lv-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r2);
  padding:14px;display:block;color:var(--ink);box-shadow:var(--shadow);
  position:relative;overflow:hidden;transition:.2s;
}
.lv-card:active{transform:scale(.975)}
.lv-card .bar{position:absolute;inset:0 auto 0 0;width:5px}
.lv-ico{
  width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
  font-size:21px;color:#fff;margin-bottom:9px;font-family:"Noto Sans JP",sans-serif;
}
.lv-card b{display:block;font-size:.95rem}
.lv-card .g{font-size:.74rem;color:var(--ink2)}
.lv-card .d{font-size:.78rem;color:var(--ink2);margin-top:6px;line-height:1.6}

/* ---------- Progress ---------- */
.pbar{height:8px;border-radius:99px;background:var(--bg2);overflow:hidden;margin-top:9px}
.pbar i{display:block;height:100%;background:var(--brand);border-radius:99px;transition:width .5s}
.pct{font-size:.72rem;color:var(--ink2);margin-top:4px;display:block}

/* ---------- ปุ่ม ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:12px 18px;border-radius:14px;border:1px solid var(--line);
  background:var(--bg2);color:var(--ink);font:inherit;font-weight:600;
  cursor:pointer;transition:.18s;
}
.btn:active{transform:scale(.96)}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn.ghost{background:transparent}
.btn.wide{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}

/* ---------- ปุ่มฟังเสียง ---------- */
.spk{
  border:none;background:var(--brand);color:#fff;width:30px;height:30px;
  border-radius:50%;cursor:pointer;font-size:13px;line-height:1;
  vertical-align:middle;transition:.15s;flex:none;
}
.spk:active{transform:scale(.85)}
.spk.playing{animation:pulse .7s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 7px rgba(76,140,123,.25)}}

/* ---------- ตารางคำศัพท์ ---------- */
.vtable{width:100%;border-collapse:collapse;font-size:.92rem;margin:10px 0}
.vtable th{
  background:var(--bg2);color:var(--ink2);font-size:.76rem;font-weight:600;
  text-align:left;padding:8px 9px;border-bottom:1px solid var(--line);
}
.vtable td{padding:9px;border-bottom:1px solid var(--line);vertical-align:middle}
.vtable tr:last-child td{border-bottom:none}
.v-jp .jp-word{font-size:1.12rem;font-weight:600;font-family:"Noto Sans JP",sans-serif}
.v-kana{display:block;font-size:.74rem;color:var(--ink2);font-family:"Noto Sans JP",sans-serif}
.v-ro{color:var(--accent);font-size:.84rem;font-style:italic}
.v-sp{width:42px;text-align:right}

/* ---------- ตัวอย่างประโยค ---------- */
.ex-item{
  background:var(--bg2);border-left:4px solid var(--brand);
  border-radius:0 12px 12px 0;padding:12px 14px;margin:10px 0;
}
.ex-no{font-size:.7rem;color:var(--brand2);font-weight:700;letter-spacing:.5px;margin-bottom:5px}
.ex-jp{font-size:1.12rem;font-weight:600;font-family:"Noto Sans JP",sans-serif;line-height:1.7}
.ex-kana{font-size:.84rem;color:var(--ink2);font-family:"Noto Sans JP",sans-serif}
.ex-ro{font-size:.8rem;color:var(--accent);font-style:italic}
.ex-th{margin-top:4px}
.ex-note{
  margin-top:7px;font-size:.82rem;color:var(--ink2);
  background:var(--card);border-radius:9px;padding:7px 10px;
}

/* ---------- กล่องไวยากรณ์ / ข้อสังเกต ---------- */
.gbox{
  border:1.5px dashed var(--brand);border-radius:14px;
  padding:13px 15px;margin:12px 0;background:var(--bg2);
}
.gbox .t{font-weight:700;color:var(--brand2);margin-bottom:6px;font-size:.92rem}
.formula{
  font-family:"Noto Sans JP",monospace;background:var(--card);
  border:1px solid var(--line);border-radius:10px;padding:11px 13px;
  margin:8px 0;font-size:1rem;text-align:center;font-weight:600;line-height:2;
}
.tip{border-left:4px solid var(--warn);background:var(--bg2);
  border-radius:0 12px 12px 0;padding:11px 14px;margin:11px 0;font-size:.9rem}
.warnbox{border-left:4px solid var(--bad);background:var(--bg2);
  border-radius:0 12px 12px 0;padding:11px 14px;margin:11px 0;font-size:.9rem}

/* ---------- รูปภาพประกอบ ---------- */
figure.lsn-img{margin:14px 0;text-align:center}
figure.lsn-img img{
  max-width:100%;border-radius:14px;border:1px solid var(--line);
  background:#fff;box-shadow:var(--shadow);
}
html[data-theme="dark"] figure.lsn-img img{opacity:.92}
figure.lsn-img figcaption{font-size:.76rem;color:var(--ink2);margin-top:6px}

/* ---------- ตารางคานะ ---------- */
.kana-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:12px 0}
.kana-cell{
  background:var(--bg2);border:1px solid var(--line);border-radius:11px;
  padding:9px 3px;text-align:center;cursor:pointer;transition:.15s;
}
.kana-cell:active{transform:scale(.92);background:var(--brand);color:#fff}
.kana-cell .k{font-size:1.4rem;font-family:"Noto Sans JP",sans-serif;font-weight:600;line-height:1.3}
.kana-cell .r{font-size:.68rem;color:var(--ink2)}
.kana-cell.empty{visibility:hidden}

/* ---------- Quiz ---------- */
.q-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.q-chip{background:var(--brand);color:#fff;border-radius:99px;padding:3px 12px;font-size:.78rem;font-weight:700}
.q-text{font-size:1.06rem;font-weight:600;margin:10px 0 14px;line-height:1.8}
.opt{
  display:flex;align-items:flex-start;gap:11px;width:100%;text-align:left;
  background:var(--bg2);border:1.5px solid var(--line);border-radius:14px;
  padding:12px 14px;margin-bottom:9px;color:var(--ink);font:inherit;cursor:pointer;transition:.15s;
}
.opt:active{transform:scale(.985)}
.opt .k{
  width:26px;height:26px;border-radius:8px;background:var(--card);
  border:1px solid var(--line);display:grid;place-items:center;
  font-size:.8rem;font-weight:700;flex:none;margin-top:1px;
}
.opt.sel{border-color:var(--brand);background:rgba(76,140,123,.12)}
.opt.right{border-color:var(--ok);background:rgba(63,125,78,.15)}
.opt.wrong{border-color:var(--bad);background:rgba(176,74,61,.15)}
.opt[disabled]{cursor:default}
.explain{
  margin-top:10px;border-radius:14px;padding:12px 14px;font-size:.9rem;
  border-left:4px solid var(--warn);background:var(--bg2);
}
.explain b{color:var(--brand2)}

/* ---------- ผลคะแนน ---------- */
.score-ring{
  width:148px;height:148px;border-radius:50%;margin:8px auto 14px;
  display:grid;place-items:center;font-size:2.3rem;font-weight:800;
  background:conic-gradient(var(--brand) var(--p,0%),var(--bg2) 0);
  position:relative;
}
.score-ring::after{
  content:"";position:absolute;inset:11px;border-radius:50%;background:var(--card);
}
.score-ring span{position:relative;z-index:1}

/* ---------- Badge / Pill ---------- */
.pill{display:inline-block;padding:3px 11px;border-radius:99px;font-size:.74rem;
  background:var(--bg2);border:1px solid var(--line);color:var(--ink2)}
.pill.ok{background:rgba(63,125,78,.16);color:var(--ok);border-color:transparent}
.pill.bad{background:rgba(176,74,61,.16);color:var(--bad);border-color:transparent}

/* ---------- ฟอร์ม ---------- */
.field{margin:10px 0}
.field label{display:block;font-size:.82rem;color:var(--ink2);margin-bottom:5px;font-weight:600}
.field input,.field select{
  width:100%;padding:12px 14px;border-radius:13px;border:1.5px solid var(--line);
  background:var(--bg2);color:var(--ink);font:inherit;
}
.field input:focus,.field select:focus{outline:2px solid var(--brand);border-color:transparent}

/* ---------- Breadcrumb ---------- */
.crumb{font-size:.78rem;color:var(--ink2);margin:12px 0 4px;display:flex;gap:5px;
  flex-wrap:wrap;align-items:center}
.crumb i{font-style:normal;opacity:.5}

/* ---------- Accordion บทเรียน ---------- */
.acc{border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden;background:var(--card)}
.acc>summary{
  padding:13px 15px;cursor:pointer;font-weight:600;list-style:none;
  display:flex;align-items:center;gap:10px;background:var(--bg2);
}
.acc>summary::-webkit-details-marker{display:none}
.acc>summary::after{content:"＋";margin-left:auto;color:var(--brand2);font-weight:700}
.acc[open]>summary::after{content:"−"}
.acc .acc-body{padding:14px 15px}

/* ---------- Bottom Nav ---------- */
.bnav{
  position:fixed;left:0;right:0;bottom:0;z-index:60;height:var(--nav-h);
  background:var(--card);border-top:1px solid var(--line);
  display:flex;padding-bottom:env(safe-area-inset-bottom);
  box-shadow:0 -2px 14px rgba(0,0,0,.08);
}
.bnav a{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;color:var(--ink2);font-size:.66rem;text-decoration:none;transition:.15s;
}
.bnav a .i{font-size:19px;line-height:1}
.bnav a.active{color:var(--brand)}
.bnav a:active{background:var(--bg2)}

/* ---------- Drawer เมนูเต็ม ---------- */
.drawer{position:fixed;inset:0;z-index:90;display:none}
.drawer.show{display:block}
.drawer .sc{position:absolute;inset:0;background:rgba(0,0,0,.45);backdrop-filter:blur(2px)}
.drawer .pn{
  position:absolute;top:0;right:0;bottom:0;width:min(82vw,320px);
  background:var(--card);border-left:1px solid var(--line);
  padding:16px;overflow:auto;animation:slide .22s ease;
}
@keyframes slide{from{transform:translateX(100%)}}
.drawer .pn h3{margin-bottom:12px}
.dlink{
  display:flex;align-items:center;gap:11px;padding:12px;border-radius:13px;
  color:var(--ink);margin-bottom:5px;font-size:.93rem;
}
.dlink:active{background:var(--bg2)}
.dlink .i{width:30px;text-align:center;font-size:17px}
.dsep{height:1px;background:var(--line);margin:11px 0}

/* ---------- Utilities ---------- */
.muted{color:var(--ink2)} .center{text-align:center}
.mt0{margin-top:0}.mb0{margin-bottom:0}
.hr{height:1px;background:var(--line);border:0;margin:16px 0}
.flex{display:flex;gap:10px;align-items:center}
.sp{margin-left:auto}
.hide{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media print{.topbar,.bnav,.btn-row,.drawer{display:none!important}body{padding:0;background:#fff}}