:root{
  color-scheme:light;
  --bg:#f4f5f3;
  --surface:#ffffff;
  --surface-2:#eef0ed;
  --surface-3:#e5e8e4;
  --text:#182028;
  --muted:#68717a;
  --line:#d9ddd8;
  --line-strong:#c4cac4;
  --accent:#2f5f83;
  --accent-soft:#e8f0f6;
  --accent-ink:#173f5d;
  --good:#1d6b4b;
  --good-soft:#e8f5ef;
  --bad:#9a3f35;
  --bad-soft:#f8ecea;
  --warn:#8a641b;
  --warn-soft:#fbf4df;
  --shadow:0 8px 24px rgba(22,32,43,.07);
  --radius:18px;
  --radius-sm:12px;
  --content:1180px;
  --font-scale:1;
  --header-h:64px;
  --dock-h:72px;
}
html[data-theme="dark"]{
  color-scheme:dark;
  --bg:#11161c;
  --surface:#182029;
  --surface-2:#202a34;
  --surface-3:#29343f;
  --text:#edf1f4;
  --muted:#aeb7bf;
  --line:#303b45;
  --line-strong:#46525e;
  --accent:#7eb4d6;
  --accent-soft:#183247;
  --accent-ink:#c9e8fa;
  --good:#70c69e;
  --good-soft:#183b2d;
  --bad:#ef9d94;
  --bad-soft:#472723;
  --warn:#dfbd69;
  --warn-soft:#42371c;
  --shadow:0 10px 28px rgba(0,0,0,.2);
}
@media (prefers-color-scheme:dark){
  html:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#11161c;--surface:#182029;--surface-2:#202a34;--surface-3:#29343f;
    --text:#edf1f4;--muted:#aeb7bf;--line:#303b45;--line-strong:#46525e;
    --accent:#7eb4d6;--accent-soft:#183247;--accent-ink:#c9e8fa;
    --good:#70c69e;--good-soft:#183b2d;--bad:#ef9d94;--bad-soft:#472723;
    --warn:#dfbd69;--warn-soft:#42371c;--shadow:0 10px 28px rgba(0,0,0,.2)
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",sans-serif;
  font-size:calc(16px * var(--font-scale));line-height:1.62;letter-spacing:-.014em;
  text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased
}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.45}
img{display:block;max-width:100%}
a{color:inherit}
.skip-link{position:fixed;left:12px;top:-80px;z-index:9999;background:var(--text);color:var(--surface);padding:10px 14px;border-radius:8px;text-decoration:none}
.skip-link:focus{top:12px}
.app-shell{min-height:100vh}
.app-header{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.header-inner{height:var(--header-h);max-width:var(--content);margin:auto;padding:0 24px;display:flex;align-items:center;gap:24px}
.brand-button{display:flex;align-items:center;gap:10px;background:none;border:0;padding:4px;min-width:210px;text-align:left}
.brand-button img{width:31px;height:31px}
.brand-copy{display:flex;flex-direction:column;line-height:1.2}
.brand-copy b{font-size:15px;letter-spacing:-.025em}
.brand-copy small{font-size:11px;color:var(--muted);margin-top:3px}
.desktop-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.desktop-nav button,.icon-btn{border:0;background:transparent;color:var(--muted);border-radius:9px;padding:8px 11px;font-size:14px;font-weight:700}
.desktop-nav button:hover,.desktop-nav button.is-active,.icon-btn:hover{background:var(--surface-2);color:var(--text)}
.header-actions{display:flex;align-items:center;gap:4px}
.header-progress{font-size:13px;color:var(--muted);white-space:nowrap;margin-right:4px}
.global-progress{height:2px;background:transparent}
.global-progress span{display:block;height:100%;width:0;background:var(--accent);transition:width .25s ease}
main{max-width:var(--content);margin:0 auto;padding:42px 24px 112px}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(29px,4vw,46px);line-height:1.16;letter-spacing:-.045em;margin-bottom:12px}
h2{font-size:22px;line-height:1.3;letter-spacing:-.03em}
h3{font-size:17px;line-height:1.35;letter-spacing:-.02em}
.lead{max-width:690px;color:var(--muted);font-size:17px;margin-bottom:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 0 rgba(0,0,0,.01)}
.primary-btn,.secondary-btn,.quiet-btn{min-height:44px;border-radius:11px;padding:0 16px;font-weight:800;border:1px solid transparent}
.primary-btn{background:var(--text);color:var(--surface)}
.primary-btn:hover{filter:brightness(1.08)}
.secondary-btn{background:var(--surface);border-color:var(--line-strong)}
.secondary-btn:hover{background:var(--surface-2)}
.quiet-btn{background:transparent;color:var(--muted)}
.quiet-btn:hover{background:var(--surface-2);color:var(--text)}
.resume-card{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;padding:24px;margin-bottom:24px;border-color:color-mix(in srgb,var(--accent) 32%,var(--line));background:linear-gradient(140deg,var(--surface),color-mix(in srgb,var(--accent-soft) 45%,var(--surface)))}
.resume-copy small{display:block;color:var(--muted);font-weight:700;margin-bottom:5px}
.resume-copy strong{display:block;font-size:21px;letter-spacing:-.025em;margin-bottom:5px}
.resume-copy p{margin:0;color:var(--muted);font-size:14px}
.resume-actions{display:flex;gap:8px}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:34px 0 14px}
.section-head h2{margin:0}
.section-head p{margin:0;color:var(--muted);font-size:13px}
.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.quick-card{appearance:none;text-align:left;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);min-height:132px;display:flex;flex-direction:column;justify-content:space-between}
.quick-card:hover{border-color:var(--accent);transform:translateY(-1px)}
.quick-card .quick-icon{font-size:12px;color:var(--accent);font-weight:900;letter-spacing:.05em}
.quick-card strong{display:block;font-size:17px;margin-top:16px}
.quick-card small{display:block;color:var(--muted);margin-top:4px}
.course-list{display:grid;gap:12px}
.course-row{padding:20px 22px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:center}
.course-title-line{display:flex;align-items:center;gap:9px;margin-bottom:6px}
.course-title-line h3{margin:0;font-size:19px}
.course-dot{width:9px;height:9px;border-radius:99px;background:var(--course-color,var(--accent))}
.course-meta{color:var(--muted);font-size:14px;margin:0}
.meter{height:5px;background:var(--surface-2);border-radius:99px;overflow:hidden;margin-top:14px}
.meter span{display:block;height:100%;background:var(--course-color,var(--accent));border-radius:inherit}
.course-actions{display:flex;gap:8px}
.metric-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.metric{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm)}
.metric small{display:block;color:var(--muted);font-size:12px;font-weight:700;margin-bottom:4px}
.metric strong{font-size:23px;letter-spacing:-.035em}
/* study */
.study-page{max-width:1100px;margin:auto}
.study-toolbar{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:18px}
.study-kicker{font-size:13px;color:var(--muted);font-weight:700;margin-bottom:4px}
.study-title{font-size:26px;margin:0 0 4px}
.study-source{font-size:13px;color:var(--muted);margin:0}
.study-actions{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.icon-action{height:40px;min-width:40px;padding:0 11px;border:1px solid var(--line);background:var(--surface);border-radius:10px;font-size:13px;font-weight:800}
.icon-action:hover,.icon-action.is-active{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-ink)}
.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px;align-items:start}
.question-card{overflow:hidden}
.question-meta{display:flex;justify-content:space-between;gap:12px;padding:13px 16px;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.question-canvas{position:relative;background:#f5f5f1;overflow:auto;min-height:220px;max-height:min(64vh,760px);display:flex;justify-content:center;align-items:flex-start;padding:16px;overscroll-behavior:contain}
html[data-theme="dark"] .question-canvas{background:#d9d9d5}
.question-canvas img{width:auto;max-width:none;height:auto;transform-origin:top center;transition:width .15s ease;box-shadow:0 1px 3px rgba(0,0,0,.12)}
.question-canvas[data-mode="fit"] img{width:min(100%,var(--natural-width,900px))}
.question-canvas[data-mode="actual"] img{width:var(--natural-width,900px)}
.question-canvas[data-mode="zoom"] img{width:calc(min(100%,var(--natural-width,900px)) * var(--zoom,1.2))}
.question-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.question-tool-buttons{display:flex;gap:4px}
.question-tool-buttons button{height:34px;min-width:36px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:0 9px;font-size:12px;font-weight:800}
.question-tool-buttons button.is-active{background:var(--surface-2);color:var(--text)}
.answer-card{position:sticky;top:calc(var(--header-h) + 18px);padding:18px}
.answer-card h2{font-size:16px;margin-bottom:4px}
.answer-help{font-size:12px;color:var(--muted);margin-bottom:16px}
.answer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
.answer-btn{height:58px;border:1px solid var(--line-strong);background:var(--surface);border-radius:12px;font-size:24px;font-weight:700}
.answer-btn:hover{border-color:var(--accent);background:var(--accent-soft)}
.answer-btn.is-selected{outline:2px solid var(--accent);outline-offset:1px}
.answer-btn.is-correct{border-color:var(--good);background:var(--good-soft);color:var(--good)}
.answer-btn.is-wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}
.answer-summary{margin-top:14px;padding:13px;border-radius:10px;font-size:13px;font-weight:700}
.answer-summary.good{background:var(--good-soft);color:var(--good)}
.answer-summary.bad{background:var(--bad-soft);color:var(--bad)}
.confidence{margin-top:16px;border-top:1px solid var(--line);padding-top:14px}
.confidence-label{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:8px}
.confidence-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}
.confidence-buttons button{height:34px;border:1px solid var(--line);background:var(--surface);border-radius:8px;font-size:11px;font-weight:800}
.confidence-buttons button.is-active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-ink)}
.explanation-card{margin-top:18px;overflow:hidden}
.explanation-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start;padding:20px 22px;border-bottom:1px solid var(--line)}
.result-title{display:flex;align-items:center;gap:12px}
.result-mark{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:900}
.result-mark.good{background:var(--good-soft);color:var(--good)}
.result-mark.bad{background:var(--bad-soft);color:var(--bad)}
.result-title strong{display:block;font-size:18px}
.result-title small{display:block;color:var(--muted);margin-top:2px}
.status-badge{white-space:nowrap;font-size:11px;font-weight:800;padding:5px 8px;border-radius:99px;background:var(--surface-2);color:var(--muted)}
.status-badge.verified{background:var(--good-soft);color:var(--good)}
.status-badge.review{background:var(--warn-soft);color:var(--warn)}
.ex-tabs{display:flex;gap:4px;padding:10px 14px;border-bottom:1px solid var(--line);overflow:auto}
.ex-tabs button{border:0;background:transparent;border-radius:8px;padding:8px 11px;font-size:13px;font-weight:800;color:var(--muted);white-space:nowrap}
.ex-tabs button.is-active{background:var(--surface-2);color:var(--text)}
.ex-panel{padding:22px;display:none}
.ex-panel.is-active{display:block}
.ex-block{margin-bottom:24px}
.ex-block:last-child{margin-bottom:0}
.ex-block h3{font-size:13px;text-transform:none;color:var(--muted);margin-bottom:8px}
.ex-block p{margin:0;white-space:pre-line}
.key-answer{font-size:18px;font-weight:800;line-height:1.55;padding:16px 18px;background:var(--accent-soft);border-radius:12px;color:var(--accent-ink)}
.option-analysis{display:grid;gap:9px}
.option-row{display:grid;grid-template-columns:34px 1fr;gap:10px;padding:14px;border:1px solid var(--line);border-radius:12px}
.option-row.is-answer{border-color:color-mix(in srgb,var(--good) 55%,var(--line));background:var(--good-soft)}
.option-number{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:var(--surface-2);font-weight:900}
.option-row.is-answer .option-number{background:var(--good);color:white}
.option-text{font-size:14px;font-weight:700;margin-bottom:5px;word-break:keep-all}
.option-verdict{font-size:13px;color:var(--muted)}
.option-row.is-answer .option-verdict{color:var(--good)}
.reference-list{display:grid;gap:8px}
.reference-item{padding:12px 14px;border-left:3px solid var(--line-strong);background:var(--surface-2);font-size:13px}
.audit-note{padding:14px;background:var(--warn-soft);color:var(--warn);border-radius:10px;font-size:13px}
.note-card{margin-top:18px;padding:18px}
.note-card label{display:flex;justify-content:space-between;gap:12px;font-size:13px;font-weight:800;margin-bottom:8px}
.note-card label span{color:var(--muted);font-weight:600}
.note-card textarea{width:100%;min-height:92px;resize:vertical;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:12px;outline:none}
.note-card textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
/* library */
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.filter-bar input,.filter-bar select{height:42px;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:0 12px;outline:none}
.filter-bar input{min-width:260px;flex:1}
.filter-bar input:focus,.filter-bar select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.library-list{display:grid;gap:9px}
.library-row{display:grid;grid-template-columns:58px minmax(0,1fr) auto;gap:14px;align-items:center;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:12px}
.library-row:hover{border-color:var(--accent)}
.library-index{font-size:12px;color:var(--muted);font-weight:800}
.library-main{min-width:0}
.library-main strong{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.library-main small{display:block;color:var(--muted);font-size:12px;margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.library-state{display:flex;align-items:center;gap:6px}
.mini-badge{font-size:10px;font-weight:800;padding:4px 7px;border-radius:99px;background:var(--surface-2);color:var(--muted)}
.mini-badge.good{background:var(--good-soft);color:var(--good)}
.mini-badge.bad{background:var(--bad-soft);color:var(--bad)}
.pagination{display:flex;justify-content:center;gap:8px;margin-top:18px}
/* stats */
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.stats-card{padding:20px}
.stats-card h3{margin-bottom:14px}
.stat-line{display:flex;justify-content:space-between;gap:12px;font-size:14px;margin:8px 0}
.stat-line span{color:var(--muted)}
.bar-list{display:grid;gap:14px}
.bar-item-head{display:flex;justify-content:space-between;font-size:13px;margin-bottom:6px}
/* modal */
.modal-backdrop{position:fixed;inset:0;z-index:100;background:rgba(10,15,20,.54);display:grid;place-items:center;padding:20px}
.modal{width:min(680px,100%);max-height:min(88vh,860px);overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:0 20px 70px rgba(0,0,0,.28)}
.modal.wide{width:min(960px,100%)}
.modal-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px;background:var(--surface);border-bottom:1px solid var(--line)}
.modal-head h2{margin:0;font-size:19px}
.modal-close{border:0;background:var(--surface-2);width:36px;height:36px;border-radius:9px;font-weight:900}
.modal-body{padding:20px}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.field{display:grid;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:12px;color:var(--muted);font-weight:800}
.field select,.field input{height:44px;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:0 11px}
.check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.check-item{display:flex;align-items:center;gap:8px;padding:10px;border:1px solid var(--line);border-radius:10px;font-size:13px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;padding:16px 20px;border-top:1px solid var(--line)}
.setting-list{display:grid;gap:10px}
.setting-row{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;padding:15px 0;border-bottom:1px solid var(--line)}
.setting-row:last-child{border-bottom:0}
.setting-row b{display:block;font-size:14px}
.setting-row p{margin:3px 0 0;color:var(--muted);font-size:12px}
.setting-row select,.setting-row button{height:38px;border:1px solid var(--line);background:var(--surface);border-radius:9px;padding:0 10px;font-size:13px;font-weight:700}
.queue-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:6px}
.queue-grid button{aspect-ratio:1;border:1px solid var(--line);background:var(--surface);border-radius:8px;font-size:11px;font-weight:800}
.queue-grid button.is-current{outline:2px solid var(--accent)}
.queue-grid button.is-correct{background:var(--good-soft);color:var(--good);border-color:var(--good)}
.queue-grid button.is-wrong{background:var(--bad-soft);color:var(--bad);border-color:var(--bad)}
.image-viewer{width:min(1200px,100%);height:min(94vh,980px);display:flex;flex-direction:column}
.image-viewer .modal-body{flex:1;overflow:auto;background:#d9d9d5;display:flex;justify-content:center;align-items:flex-start}
.image-viewer img{max-width:none;width:var(--viewer-width,100%);height:auto}
.viewer-controls{display:flex;gap:8px;align-items:center}
.viewer-controls input{width:160px}
/* navigation */
.mobile-nav{display:none}
.study-dock{position:fixed;z-index:70;left:50%;bottom:max(12px,env(safe-area-inset-bottom));transform:translateX(-50%);width:min(520px,calc(100% - 24px));height:58px;padding:6px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);display:grid;grid-template-columns:1fr .8fr 1.2fr;gap:6px}
.study-dock.is-hidden{display:none}
.study-dock button{border:0;background:transparent;border-radius:10px;font-weight:800}
.study-dock button:hover{background:var(--surface-2)}
.study-dock .primary{background:var(--text);color:var(--surface)}
.toast{position:fixed;z-index:200;left:50%;bottom:96px;transform:translate(-50%,12px);background:var(--text);color:var(--surface);border-radius:10px;padding:10px 14px;font-size:13px;font-weight:700;opacity:0;pointer-events:none;transition:.2s ease}
.toast.is-visible{opacity:1;transform:translate(-50%,0)}
.empty-state{text-align:center;padding:56px 20px;color:var(--muted)}
.empty-state h2{color:var(--text)}
.skeleton{background:linear-gradient(90deg,var(--surface-2),var(--surface-3),var(--surface-2));background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:10px}
@keyframes shimmer{to{background-position:-200% 0}}
@media (max-width:900px){
  .quick-grid{grid-template-columns:repeat(2,1fr)}
  .study-layout{grid-template-columns:1fr}
  .answer-card{position:static}
  .stats-grid{grid-template-columns:1fr}
  .metric-strip{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:700px){
  :root{--header-h:58px}
  body{font-size:calc(15px * var(--font-scale))}
  .header-inner{padding:0 16px;gap:8px}
  .brand-button{min-width:0}
  .brand-copy small{display:none}
  .brand-copy b{font-size:14px}
  .desktop-nav{display:none}
  .header-actions{margin-left:auto}
  .header-progress{font-size:11px}
  .icon-btn{padding:7px 8px;font-size:12px}
  main{padding:28px 16px 120px}
  .page-head{align-items:flex-start;flex-direction:column;margin-bottom:22px}
  h1{font-size:31px}
  .lead{font-size:15px}
  .resume-card{grid-template-columns:1fr;padding:19px;gap:16px}
  .resume-actions{width:100%}
  .resume-actions button{flex:1}
  .quick-grid{gap:9px}
  .quick-card{min-height:118px;padding:15px}
  .course-row{grid-template-columns:1fr;padding:17px}
  .course-actions button{flex:1}
  .course-actions{width:100%}
  .metric-strip{grid-template-columns:repeat(2,1fr)}
  .metric{padding:14px}
  .study-toolbar{align-items:flex-start}
  .study-title{font-size:23px}
  .study-actions .icon-action{height:36px}
  .question-canvas{padding:8px;min-height:180px;max-height:58vh}
  .question-meta{padding:11px 12px}
  .question-tools{padding:8px 10px}
  .answer-card{padding:15px}
  .answer-grid{grid-template-columns:repeat(4,1fr)}
  .answer-btn{height:52px;font-size:21px}
  .explanation-head,.ex-panel{padding:17px}
  .option-row{padding:12px;grid-template-columns:30px 1fr}
  .option-number{width:28px;height:28px}
  .note-card{padding:15px}
  .filter-bar{display:grid;grid-template-columns:1fr 1fr}
  .filter-bar input{grid-column:1/-1;min-width:0}
  .library-row{grid-template-columns:44px minmax(0,1fr);padding:12px}
  .library-state{grid-column:2;justify-content:flex-start}
  .form-grid{grid-template-columns:1fr}
  .field.full{grid-column:auto}
  .queue-grid{grid-template-columns:repeat(8,1fr)}
  .mobile-nav{position:fixed;z-index:55;left:0;right:0;bottom:0;height:calc(62px + env(safe-area-inset-bottom));padding:5px 16px env(safe-area-inset-bottom);background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(14px);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr)}
  .mobile-nav button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:800;border-radius:9px}
  .mobile-nav button.is-active{color:var(--text);background:var(--surface-2)}
  body.is-studying .mobile-nav{display:none}
  .study-dock{bottom:max(10px,env(safe-area-inset-bottom));height:58px}
  .toast{bottom:84px}
}
@media (max-width:400px){
  .brand-copy b{max-width:130px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .quick-grid{grid-template-columns:1fr 1fr}
  .quick-card strong{font-size:15px}
  .quick-card small{font-size:11px}
  .answer-btn{height:48px}
  .queue-grid{grid-template-columns:repeat(7,1fr)}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* v3: 다양한 원문 비율 자동 가독성 보정 */
.question-canvas[data-mode="auto"] img{width:min(100%,var(--natural-width,900px))}
.question-canvas[data-aspect="wide"]{align-items:center;min-height:clamp(150px,24vw,240px)}
.question-canvas[data-aspect="tall"]{max-height:min(72vh,820px)}
.question-tools{flex-wrap:wrap}
.status-badge.standard{background:var(--warn-soft);color:var(--warn)}
@media (max-width:700px){
  .question-canvas[data-mode="auto"][data-aspect="wide"]{justify-content:flex-start;scrollbar-gutter:stable}
  .question-canvas[data-mode="auto"][data-aspect="wide"] img{width:min(var(--natural-width,900px),max(165%,560px))}
  .question-tools>span{flex:1 1 120px}
  .question-tool-buttons{margin-left:auto}
  .question-tool-buttons button{min-width:34px;padding:0 7px}
}