/* Layout: one phone-width column (max 520px) like an installed app; bottom tab bar; lessons open as a full-screen sheet.
   Look: hanji paper, 쪽빛 indigo ink, a red teacher's seal (도장) for "checked by the teacher" moments. */
:root{
  --paper:#F2F4F3; --card:#FFFFFF; --ink:#1B2430; --muted:#5B6773; --line:#DBE1E4;
  --indigo:#23507C; --indigo-ink:#FFFFFF; --indigo-soft:#E2EBF4;
  --seal:#B5322A; --seal-soft:#F7E4E1;
  --good:#2C7A4B; --good-soft:#E1F1E7; --bad:#B4532A; --bad-soft:#F8E7DD;
  --shadow:0 1px 2px rgba(27,36,48,.06),0 4px 14px rgba(27,36,48,.05);
  --f-ui:"Manrope","Gowun Dodum",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-ko:"Gowun Batang","Noto Serif KR","Apple SD Gothic Neo",serif;
  --f-ko-sans:"Gowun Dodum","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#11161B; --card:#1A2128; --ink:#E6EBEE; --muted:#98A5B0; --line:#2A333C;
  --indigo:#8FB8E2; --indigo-ink:#0F1A26; --indigo-soft:#1D3045;
  --seal:#E46B60; --seal-soft:#3A2220;
  --good:#6CC793; --good-soft:#1C3326; --bad:#E89A70; --bad-soft:#3A2619;
  --shadow:0 1px 2px rgba(0,0,0,.3); color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#11161B; --card:#1A2128; --ink:#E6EBEE; --muted:#98A5B0; --line:#2A333C;
  --indigo:#8FB8E2; --indigo-ink:#0F1A26; --indigo-soft:#1D3045;
  --seal:#E46B60; --seal-soft:#3A2220;
  --good:#6CC793; --good-soft:#1C3326; --bad:#E89A70; --bad-soft:#3A2619;
  --shadow:0 1px 2px rgba(0,0,0,.3); color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--f-ui);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}
.app{max-width:520px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:0 calc(88px + env(safe-area-inset-bottom,0px))}
.ko{font-family:var(--f-ko);font-weight:700;letter-spacing:-.01em}
.kos{font-family:var(--f-ko-sans)}
.muted{color:var(--muted)}
.small{font-size:13px}
h1,h2,h3{text-wrap:balance;margin:0}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:18px 10px}
.brand{display:flex;flex-direction:column;line-height:1.1}
.brand b{font-family:var(--f-ko);font-size:22px;letter-spacing:-.02em}
.brand b span{color:var(--seal)}
.brand small{font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:4px}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--indigo-soft);color:var(--indigo);font-size:12px;font-weight:700}
.stack{display:flex;flex-direction:column;gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;min-width:0}
.eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;font-weight:700;background:var(--indigo);color:var(--indigo-ink)}
.btn.ghost{background:transparent;color:var(--indigo);border:1.5px solid var(--line)}
.btn.block{width:100%}
.btn:disabled{opacity:.4;cursor:not-allowed}
.icon-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--indigo);flex:none}
.icon-btn svg{width:18px;height:18px}
.row{display:flex;align-items:center;gap:12px}
.grow{flex:1;min-width:0}
/* hero */
.hero{padding:20px 18px;border-radius:20px;background:var(--indigo);color:var(--indigo-ink);position:relative;overflow:hidden}
.hero .ko{font-size:28px;line-height:1.2}
.hero p{margin:6px 0 0;opacity:.85}
.hero::after{content:"한";position:absolute;right:-6px;bottom:-34px;font-family:var(--f-ko);font-size:150px;opacity:.09;line-height:1}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat b{display:block;font-size:26px;font-variant-numeric:tabular-nums;line-height:1.1}
/* seal */
.seal{display:inline-grid;place-items:center;width:58px;height:58px;border:2.5px solid var(--seal);border-radius:50%;color:var(--seal);font-family:var(--f-ko);font-weight:700;font-size:13px;line-height:1.05;text-align:center;transform:rotate(-12deg);flex:none}
.seal.sm{width:22px;height:22px;font-size:9px;border-width:1.5px;transform:rotate(-8deg)}
.seal.big{width:120px;height:120px;font-size:26px;border-width:4px}
.teacher{display:flex;gap:14px;align-items:flex-start}
.teacher q{quotes:none;display:block;font-size:15px}
/* lesson list */
.unit-h{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.lessons{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.lesson{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--line)}
.lesson:first-child{border-top:0}
.ln{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:13px;border:1.5px solid var(--line);color:var(--muted);flex:none;font-variant-numeric:tabular-nums}
.lesson.done .ln{background:var(--good-soft);border-color:var(--good);color:var(--good)}
.lesson.now .ln{background:var(--indigo);border-color:var(--indigo);color:var(--indigo-ink)}
.lesson.locked{opacity:.5}
.lesson button.grow{all:unset;cursor:pointer;flex:1;min-width:0}
.lesson.locked button.grow{cursor:not-allowed}
.lesson .t{font-weight:700}
.lesson .s{font-size:13px;color:var(--muted)}
.soon{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px dashed var(--line);font-size:14px}
.soon:first-of-type{border-top:0}
/* bottom nav */
.nav{position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--card);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom,0px);padding-left:max(8px,env(safe-area-inset-left,0px));padding-right:max(8px,env(safe-area-inset-right,0px))}
.nav-in{max-width:520px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr)}
.nav button{border:0;background:none;display:flex;flex-direction:column;align-items:center;gap:3px;padding:9px 2px 8px;font-size:11px;font-weight:600;color:var(--muted)}
.nav button svg{width:22px;height:22px}
.nav button[aria-current="page"]{color:var(--indigo)}
/* lesson sheet */
.sheet{position:fixed;inset:0;z-index:40;background:var(--paper);display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.sheet-in{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}
.sheet-col{max-width:560px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:8px 24px}
.sheet-top{max-width:560px;width:100%;margin:0 auto;display:flex;align-items:center;gap:10px;padding-block:12px 8px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.bar{flex:1;height:8px;border-radius:99px;background:var(--line);overflow:hidden}
.bar i{display:block;height:100%;background:var(--indigo);border-radius:99px;transition:width .3s}
.sheet-foot{border-top:1px solid var(--line);background:var(--card)}
.sheet-foot .in{max-width:560px;margin:0 auto;display:flex;gap:10px;padding-block:12px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.sheet-foot .btn{flex:1}
.ask-fab{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:7px 12px;font-size:13px;font-weight:700;color:var(--indigo)}
.ask-fab svg{width:16px;height:16px}
.step-h{margin:10px 0 14px}
.step-h .eyebrow{color:var(--indigo)}
.step-h h2{font-size:22px;margin-top:4px}
.goal{font-family:var(--f-ko);font-size:26px;line-height:1.35;margin:8px 0 12px}
/* dialogue */
.dlg{display:flex;flex-direction:column;gap:10px}
.line{display:flex;gap:10px;align-items:flex-start}
.line.r{flex-direction:row-reverse}
.av{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-family:var(--f-ko);font-weight:700;background:var(--indigo-soft);color:var(--indigo);flex:none;font-size:13px}
.line.r .av{background:var(--seal-soft);color:var(--seal)}
.bub{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px 12px;max-width:82%;min-width:0}
.bub .k{font-family:var(--f-ko);font-size:18px;font-weight:700;line-height:1.35}
.bub .tr{font-size:13px;color:var(--muted);margin-top:2px}
.bub button{border:0;background:none;padding:0;text-align:left;width:100%}
.hide-tr .tr{visibility:hidden}
.toggles{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.chip{border:1.5px solid var(--line);background:var(--card);border-radius:999px;padding:6px 12px;font-size:13px;font-weight:700}
.chip[aria-pressed="true"]{background:var(--indigo-soft);border-color:var(--indigo);color:var(--indigo)}
/* words */
.words{display:grid;grid-template-columns:1fr;gap:8px}
.word{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px 12px}
.word .k{font-family:var(--f-ko);font-size:20px;font-weight:700}
.word .m{font-size:13.5px;color:var(--muted)}
/* grammar */
.gram p{margin:0 0 10px}
.gram .ex{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.ex-row{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;background:var(--paper)}
.ex-row .k{font-family:var(--f-ko);font-size:17px;font-weight:700}
.ex-row .m{font-size:13px;color:var(--muted)}
.analogy{border-left:3px solid var(--seal);padding:8px 12px;background:var(--seal-soft);border-radius:0 10px 10px 0;margin:10px 0}
.analogy b{color:var(--seal)}
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
.tbl th{font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.tbl .k{font-family:var(--f-ko);font-weight:700;font-size:16px}
.bat{color:var(--seal)}
/* batchim tool */
.tool{background:var(--indigo-soft);border-radius:16px;padding:14px}
.tool input{width:100%;font-family:var(--f-ko);font-size:22px;font-weight:700;padding:10px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--card);color:var(--ink)}
.syl{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:12px 0 8px;font-size:14px}
.syl .big{font-family:var(--f-ko);font-size:40px;font-weight:700;line-height:1}
.jamo{display:inline-grid;place-items:center;min-width:34px;height:34px;padding:0 6px;border-radius:8px;background:var(--card);border:1px solid var(--line);font-family:var(--f-ko-sans);font-size:18px}
.jamo.fin{border-color:var(--seal);color:var(--seal);background:var(--seal-soft)}
.forms{display:grid;grid-template-columns:1fr;gap:6px;margin-top:6px}
.form{display:flex;align-items:center;gap:10px;background:var(--card);border-radius:10px;padding:8px 10px}
.form .k{font-family:var(--f-ko);font-size:18px;font-weight:700}
.form .k em{font-style:normal;color:var(--seal)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
/* practice */
.q{font-size:17px;font-weight:700;margin:0 0 4px}
.q-ko{font-family:var(--f-ko);font-size:24px;font-weight:700;margin:8px 0 12px;line-height:1.35}
.blank{display:inline-block;min-width:44px;border-bottom:2.5px solid var(--indigo);text-align:center;color:var(--indigo)}
.opts{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.opt{display:flex;align-items:center;gap:10px;text-align:left;border:1.5px solid var(--line);background:var(--card);border-radius:14px;padding:13px 14px;font-weight:600}
.opt.ko-opt{font-family:var(--f-ko);font-size:18px;font-weight:700}
.opt[data-state="right"]{border-color:var(--good);background:var(--good-soft);color:var(--good)}
.opt[data-state="wrong"]{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}
.opt:disabled{cursor:default}
.fb{margin-top:14px;padding:12px 14px;border-radius:14px;font-size:14.5px}
.fb.ok{background:var(--good-soft);color:var(--ink)}
.fb.no{background:var(--bad-soft);color:var(--ink)}
.fb > b{display:block;margin-bottom:2px}
.fb.ok > b{color:var(--good)} .fb.no > b{color:var(--bad)}
.listen-big{display:flex;justify-content:center;gap:12px;margin:14px 0}
.listen-big .btn{padding:16px 22px;border-radius:999px}
.build{min-height:58px;border:2px dashed var(--line);border-radius:14px;padding:8px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:12px 0}
.tiles{display:flex;flex-wrap:wrap;gap:8px}
.tile{border:1.5px solid var(--line);background:var(--card);border-radius:10px;padding:8px 12px;font-family:var(--f-ko);font-size:18px;font-weight:700}
.tile.used{visibility:hidden}
.namecard{max-width:330px;margin:4px auto 14px;aspect-ratio:1.75/1;border-radius:12px;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);padding:16px 18px;display:flex;flex-direction:column;justify-content:space-between;font-family:var(--f-ko-sans)}
.namecard .co{font-size:12px;color:var(--muted);letter-spacing:.08em}
.namecard .nm{font-family:var(--f-ko);font-size:24px;font-weight:700}
.namecard .nm small{font-size:13px;color:var(--muted);font-weight:400;margin-left:8px}
.namecard .ph{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
/* mission + done */
textarea,.field{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--card);color:var(--ink);font:inherit}
textarea.kos{font-size:18px}
.done-wrap{text-align:center;padding-top:16px}
.done-wrap .score{font-size:15px;margin:14px 0 4px}
.videobox{aspect-ratio:16/9;max-width:100%;border-radius:16px;background:var(--ink);color:var(--paper);display:grid;place-items:center;text-align:center;padding:16px}
.videobox b{font-size:16px}
/* Q&A */
.search{position:relative}
.search input{width:100%;padding:13px 14px 13px 42px;border-radius:14px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-size:16px}
.search svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--muted)}
.faq{border-top:1px solid var(--line);padding:12px 0}
.faq:first-child{border-top:0;padding-top:0}
.faq summary{list-style:none;cursor:pointer;display:flex;gap:10px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq .qt{font-weight:700;flex:1;min-width:0}
.faq .meta{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px;align-items:center}
.tag{font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:6px;background:var(--paper);color:var(--muted);border:1px solid var(--line)}
.verified{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;color:var(--seal)}
.ans{margin-top:10px;padding:12px 14px;border-radius:12px;background:var(--paper)}
.ans p{margin:0}
.thanks{margin-top:10px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.filters{display:flex;gap:6px;overflow-x:auto;padding-bottom:2px}
.filters .chip{flex:none}
.similar{border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--paper);font-size:14px}
.similar button{all:unset;cursor:pointer;display:block;padding:6px 0;color:var(--indigo);font-weight:700}
.status{font-size:12px;font-weight:700;padding:2px 8px;border-radius:6px;background:var(--indigo-soft);color:var(--indigo)}
/* review */
.flash{min-height:230px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:10px;cursor:pointer}
.flash .k{font-family:var(--f-ko);font-size:40px;font-weight:700;line-height:1.2}
.flash .m{font-size:18px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.toast{position:fixed;left:50%;bottom:calc(96px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:12px;font-size:14px;z-index:60;max-width:calc(100% - 32px)}
.seg{display:flex;flex-wrap:wrap;gap:6px}
label.lbl{display:block;font-weight:700;margin-bottom:6px}
.note-demo{font-size:12px;color:var(--muted);font-style:italic}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@keyframes stamp{0%{transform:rotate(-12deg) scale(1.8);opacity:0}60%{transform:rotate(-12deg) scale(.92);opacity:1}100%{transform:rotate(-12deg) scale(1)}}
.stamp-in{animation:stamp .5s ease-out both}

/* ---------- 2026-10-17: 한글 표, 로그인, 운영자 ---------- */
.grid-wrap{overflow-x:auto;margin:6px -4px 0;padding:0 4px}
.hg{border-collapse:separate;border-spacing:4px;margin:0 auto}
.hg th{font-family:var(--f-ko-sans);font-size:15px;color:var(--muted);font-weight:700;padding:0 4px}
.hg td button{width:44px;height:44px;border-radius:10px;border:1px solid var(--line);background:var(--card);font-family:var(--f-ko);font-size:20px;font-weight:700}
.hg td button:active{background:var(--indigo-soft);border-color:var(--indigo)}
.jamo-big{font-size:34px!important;line-height:1.1}
.slow-btn{font-size:11px;font-weight:800;width:auto;padding:0 10px;border-radius:999px}
.linkish{all:unset;cursor:pointer;color:var(--indigo);font-weight:700;text-decoration:underline;text-underline-offset:3px}
.linkish:focus-visible{outline:2px solid var(--indigo)}
.top .pill{border:0;cursor:pointer;text-decoration:none;gap:6px}
.top .pill svg{width:16px;height:16px}
.admin-pill{background:var(--seal-soft)!important;color:var(--seal)!important}
.avatar{width:36px;height:36px;border-radius:50%;border:0;background:var(--indigo);color:var(--indigo-ink);font-weight:800}
.status.ok{background:var(--good-soft);color:var(--good)}
a.btn{text-decoration:none}
.btn svg{width:18px;height:18px}