:root{
  --paper:#EEF1F8;
  --paper-raised:#F9FAFD;
  --ink:#1C2A47;
  --ink-light:#57627C;
  --ink-faint:#8892A67d;
  --accent:#2E55A6;
  --accent-deep:#122C63;
  --accent-soft:#2E55A61a;
  --warn:#B0473C;
  --line:#D7DCEA;
  --grid:#DDE2EF;
  --serif:'Noto Serif KR', 'Nanum Myeongjo', Georgia, serif;
  --sans:-apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
.page{max-width:520px; margin:0 auto; min-height:100vh; display:flex; flex-direction:column;}
a{color:inherit;}
button, input{font-family:var(--sans);}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}

.topbar{
  position:sticky; top:0; z-index:5; background:var(--paper);
  padding:calc(14px + env(safe-area-inset-top)) 20px 12px;
  display:flex; align-items:center; justify-content:space-between;
  border-bottom:1px solid var(--line);
}
.topbar-left{display:flex; flex-direction:column; gap:2px; min-width:0;}
.topbar-date{font-size:13px; color:var(--ink-light);}
.topbar-dday{font-size:12.5px; font-weight:700; color:var(--accent);}
.topbar-actions{display:flex; align-items:center; gap:8px;}
.back-btn{
  background:none; border:none; color:var(--ink); font-size:15px;
  padding:6px 4px; cursor:pointer; display:flex; align-items:center; gap:4px;
}
.icon-btn{
  background:none; border:1px solid var(--line); border-radius:8px;
  width:34px; height:34px; display:flex; align-items:center; justify-content:center;
  color:var(--ink-light); cursor:pointer; flex:none;
}
.icon-btn:active{background:var(--paper-raised);}
.avatar-btn{
  border-radius:50%; border:1px solid var(--accent); background:var(--accent-soft);
  color:var(--accent); font-family:var(--serif); font-weight:700; font-size:13px;
}

.timer-wrap{display:flex; flex-direction:column; align-items:flex-end; gap:6px; min-width:92px;}
.timer-num{font-variant-numeric:tabular-nums; font-size:20px; font-weight:600; color:var(--ink);}
.timer-num.low{color:var(--warn);}
.timerbar{width:92px; height:4px; background:var(--line); border-radius:2px; overflow:hidden;}
.timerbar-fill{height:100%; background:var(--ink); width:100%; transition:width 1s linear;}
.timerbar-fill.low{background:var(--warn);}
@media (prefers-reduced-motion: reduce){ .timerbar-fill{transition:none;} }
.pulse{animation:pulse 1.1s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.45;}}
@media (prefers-reduced-motion: reduce){ .pulse{animation:none;} }

main{flex:1; padding:22px 20px 48px;}

.greeting{font-size:13px; font-weight:600; color:var(--accent); margin:0 0 8px;}
h1{
  font-family:'Fraunces', var(--serif);
  font-size:44px; font-weight:600; margin:0 0 14px;
  letter-spacing:-0.01em; color:var(--accent-deep);
}
.lede{font-size:14.5px; color:var(--ink-light); line-height:1.55; margin:0 0 22px;}
.quote-block{margin:0 0 26px; padding:14px 16px; border-left:3px solid var(--accent); background:var(--paper-raised);}
.quote-text{font-family:var(--serif); font-style:italic; font-size:15px; line-height:1.65; color:var(--ink); margin:0;}
.quote-author{display:block; margin-top:8px; font-size:12.5px; font-style:normal; color:var(--ink-light);}

.prob-list{list-style:none; margin:0; padding:0; border-top:1px solid var(--line);}
.prob-item{
  border-bottom:1px solid var(--line); display:flex; align-items:stretch; gap:14px;
  padding:16px 2px; background:none; border-left:none; border-right:none; border-top:none;
  width:100%; text-align:left; cursor:pointer;
}
.prob-item.solved{opacity:.55;}
.prob-tab{flex:none; width:28px; padding-top:2px; font-family:var(--serif); font-weight:700; font-size:15px; color:var(--accent);}
.prob-body{flex:1; min-width:0;}
.prob-skill{font-size:12.5px; color:var(--ink-light); margin-bottom:3px;}
.prob-topic{font-size:16.5px; font-weight:600; line-height:1.4;}
.prob-meta{flex:none; display:flex; flex-direction:column; align-items:flex-end; justify-content:space-between; gap:4px;}
.prob-time{font-size:12.5px; color:var(--ink-light); white-space:nowrap;}
.prob-arrow{color:var(--ink-faint); font-size:16px;}
.prob-check{
  width:20px; height:20px; border-radius:50%; border:1.5px solid var(--accent); color:var(--accent);
  font-size:12px; font-weight:700; line-height:1; display:flex; align-items:center; justify-content:center;
}

details.history{margin-top:30px; border-top:1px solid var(--line); padding-top:14px;}
details.history summary{list-style:none; cursor:pointer; font-size:14px; color:var(--ink-light); display:flex; align-items:center; gap:6px;}
details.history summary::-webkit-details-marker{display:none;}
details.history summary::after{content:'▾'; font-size:11px; transition:transform .15s;}
details.history[open] summary::after{transform:rotate(180deg);}
.hist-row{display:flex; align-items:center; gap:10px; padding:10px 0; border-bottom:1px dashed var(--line); font-size:13.5px;}
.hist-row:last-child{border-bottom:none;}
.hist-date{color:var(--ink-faint); width:44px; flex:none;}
.hist-skill{color:var(--ink-light); flex:none;}
.hist-topic{flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.hist-score{flex:none; font-weight:700; color:var(--accent);}
.hist-empty{font-size:13.5px; color:var(--ink-faint); padding:10px 0;}
.reset-link{display:inline-block; margin-top:10px; font-size:12.5px; color:var(--ink-faint); text-decoration:underline; background:none; border:none; padding:0; cursor:pointer;}

.skill-tag{display:inline-block; font-size:12.5px; color:var(--accent); border:1px solid var(--accent); border-radius:999px; padding:3px 10px; margin-bottom:16px;}
.passage{font-family:var(--serif); font-size:16px; line-height:1.75; margin-bottom:14px;}
.passage-label{color:var(--accent); font-weight:700; margin-right:4px;}

.chart-block{background:var(--paper-raised); border:1px solid var(--line); border-radius:10px; padding:14px 16px 6px; margin:18px 0;}
.chart-title{font-size:14px; font-weight:700; margin-bottom:12px;}
.chart-cat{margin-bottom:12px;}
.chart-cat-label{font-size:13px; color:var(--ink-light); margin-bottom:4px;}
.chart-bar-row{display:flex; align-items:center; gap:8px; margin-bottom:4px;}
.chart-bar-series{font-size:11px; color:var(--ink-faint); width:44px; flex:none; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.chart-bar-track{flex:1; height:14px; background:var(--line); border-radius:3px; overflow:hidden;}
.chart-bar-fill{height:100%; background:var(--accent); opacity:.8; border-radius:3px;}
.chart-bar-value{font-size:12px; width:44px; flex:none; text-align:right; font-variant-numeric:tabular-nums;}

.question-box{font-size:15.5px; font-weight:600; line-height:1.6; margin:22px 0 14px; padding-left:12px; border-left:3px solid var(--ink);}

textarea.answer{
  width:100%; min-height:220px; resize:vertical;
  font-family:var(--serif); font-size:18px; line-height:32px;
  color:var(--ink); background:var(--paper-raised);
  border:1px solid var(--line); border-radius:6px; padding:8px 12px;
  background-image:
    repeating-linear-gradient(to bottom, transparent 0, transparent 31px, var(--grid) 31px, var(--grid) 32px),
    repeating-linear-gradient(to right, transparent 0, transparent 31px, var(--grid) 31px, var(--grid) 32px);
  background-size:100% 32px, 32px 100%;
}
.counter{display:flex; justify-content:space-between; font-size:12.5px; color:var(--ink-light); margin-top:8px;}

.primary-btn{
  width:100%; margin-top:20px; padding:15px; border:none; border-radius:8px;
  background:var(--ink); color:var(--paper); font-size:16px; font-weight:600; cursor:pointer;
}
.primary-btn:disabled{opacity:.45;}
.primary-btn:active:not(:disabled){opacity:.85;}
.secondary-btn{
  width:100%; margin-top:10px; padding:14px; border:1px solid var(--line); border-radius:8px;
  background:none; color:var(--ink); font-size:15px; cursor:pointer;
}
.time-up-note{font-size:13px; color:var(--warn); margin-top:10px; text-align:center;}

.loading{padding:80px 20px; text-align:center; color:var(--ink-light); font-size:15px; line-height:1.7;}
.spinner{
  width:26px; height:26px; margin:0 auto 18px; border-radius:50%;
  border:3px solid var(--line); border-top-color:var(--accent); animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}
@media (prefers-reduced-motion: reduce){ .spinner{animation:none;} }

.error-box{padding:60px 20px; text-align:center;}
.error-box p{color:var(--ink-light); font-size:14.5px; line-height:1.6; margin-bottom:20px;}

.result-skill{font-size:13.5px; color:var(--ink-light); margin-bottom:24px;}
.score-wrap{display:flex; align-items:baseline; justify-content:center; gap:10px; margin:10px 0 30px;}
.score-circle{
  width:104px; height:104px; border:3px solid var(--accent); color:var(--accent);
  border-radius:48% 52% 45% 55%/52% 48% 55% 45%;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--serif); font-weight:700; font-size:44px; transform:rotate(-4deg);
}
.score-outof{font-size:16px; color:var(--ink-light);}
.feedback{
  font-family:var(--serif); font-size:16px; line-height:1.8; color:var(--ink);
  padding:16px 18px; background:var(--paper-raised); border:1px solid var(--line); border-radius:8px;
}
details.myanswer{margin-top:18px;}
details.myanswer summary{cursor:pointer; font-size:13.5px; color:var(--ink-light);}
details.myanswer p{font-family:var(--serif); font-size:15px; line-height:1.7; margin-top:10px; white-space:pre-wrap;}

.account-avatar{
  width:72px; height:72px; margin:8px auto 18px; border-radius:50%;
  background:var(--accent-soft); border:1px solid var(--accent); color:var(--accent);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--serif); font-weight:700; font-size:28px;
}
.account-name-row{display:flex; align-items:baseline; justify-content:center; gap:10px; margin-bottom:6px;}
.nickname-input{
  font-family:var(--serif); font-size:17px; color:var(--ink); text-align:center;
  border:none; border-bottom:1px solid var(--line); background:none; padding:2px 4px; max-width:180px;
}
.nickname-input:focus{border-bottom-color:var(--accent); outline:none;}
.save-link{background:none; border:none; color:var(--accent); font-size:13px; cursor:pointer; padding:0;}
.account-joined{font-size:12.5px; color:var(--ink-faint); text-align:center; margin:0 0 28px;}
.stat-grid{display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
.stat-box{padding:16px 6px; text-align:center; border-left:1px solid var(--line);}
.stat-box:first-child{border-left:none;}
.stat-num{display:block; font-family:var(--serif); font-weight:700; font-size:22px; color:var(--accent); margin-bottom:4px;}
.stat-label{font-size:11.5px; color:var(--ink-light);}

.dday-edit{margin-top:30px; padding-top:20px; border-top:1px solid var(--line);}
.dday-edit-label{font-size:13px; font-weight:600; color:var(--ink-light); margin-bottom:10px;}
.dday-edit-row{display:flex; gap:8px; margin-bottom:10px;}
.dday-label-input, .dday-date-input{
  flex:1; min-width:0; font-size:14px; padding:8px 10px;
  border:1px solid var(--line); border-radius:6px;
  background:var(--paper-raised); color:var(--ink); font-family:var(--sans);
}
.dday-actions{display:flex; align-items:center; gap:14px;}

#charCount.over {
  color: #e5484d;
  font-weight: 700;
}

/* 로그인 / 관리자 페이지 전용 */
.auth-wrap{padding:56px 24px;}
.auth-tabs{display:flex; gap:0; margin-bottom:28px; border-bottom:1px solid var(--line);}
.auth-tab{
  flex:1; text-align:center; padding:10px 0; background:none; border:none; cursor:pointer;
  font-size:14.5px; color:var(--ink-light); border-bottom:2px solid transparent; margin-bottom:-1px;
}
.auth-tab.active{color:var(--accent-deep); border-bottom-color:var(--accent); font-weight:600;}
.field-label{font-size:13px; color:var(--ink-light); margin:0 0 6px;}
.text-input{
  width:100%; font-size:15px; padding:12px 14px; margin-bottom:16px;
  border:1px solid var(--line); border-radius:8px; background:var(--paper-raised); color:var(--ink);
}
.text-input:focus{outline:none; border-color:var(--accent);}
.auth-msg{font-size:13.5px; color:var(--warn); margin:-6px 0 14px; min-height:1em;}
.section-title {
  margin: 28px 0 12px;
  font-size: 15px;
  font-weight: 700;
}
.empty-note {
  color: #8a8f9c;
  font-size: 13px;
  padding: 8px 0;
}
.chart-bar-fill.weak {
  background: #e5484d;
}
.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.leaderboard-row {
  display: grid;
  grid-template-columns: 24px 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 10px;
  background: #f5f6fa;
  font-size: 13px;
}
.leaderboard-row.mine {
  background: #e8ecff;
  font-weight: 700;
}
.leaderboard-rank {
  font-weight: 700;
  color: #8a8f9c;
}
.leaderboard-solved, .leaderboard-score {
  font-variant-numeric: tabular-nums;
  color: #555;
}