/* Palette and layout adapted from YunSangYeong/electrician-cbt (MIT). */
:root{font-family:"Noto Sans KR",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#24353f;background:#f6f8fa;--teal:#087f76;--navy:#152d38;--line:#e8edef;line-height:1.65}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;color:inherit;border:1px solid var(--line);background:white;border-radius:10px;padding:12px 18px;min-height:46px}button:hover:not(:disabled){border-color:var(--teal);background:#eef8f6}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #55bdb1;outline-offset:3px}a{color:var(--teal)}aside{position:fixed;inset:0 auto 0 0;width:242px;background:white;border-right:1px solid var(--line);padding:34px 20px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-size:21px;font-weight:800;letter-spacing:-1px}.brand small{display:block;font-size:10px;font-weight:400;color:#7d8993;letter-spacing:0}.symbol{background:var(--teal);color:white;padding:0 10px;border-radius:12px;font-size:30px}.caption{font-size:10px;letter-spacing:1.5px;color:#839099;margin:45px 12px 14px}nav{display:grid;gap:8px}nav button{text-align:left;border:0;color:#687b86;font-size:13px}nav button.active{background:#e8f5f2;color:var(--teal);font-weight:700}.aside-bottom{margin-top:auto;font-size:11px;color:#7d8993;padding:16px}.shell{margin-left:242px}header{padding:20px 36px;background:#fff;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;font-size:12px;color:#72818a}.badge,.tag{display:inline-block;border-radius:30px;padding:4px 12px;background:#e8f5f2;color:var(--teal);font-size:12px}main{max-width:1200px;margin:auto;padding:40px}h1{font-size:clamp(24px,3vw,34px);line-height:1.4;letter-spacing:-1px;margin:12px 0}h2{font-size:20px}h3{font-size:16px}.muted,small{color:#6f808b}.hero{padding:38px;background:var(--navy);color:#fff;border-radius:20px}.hero p{color:#c7d6dc}.hero .tag{background:#294950;color:#a6e2d7}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:24px 0}.card,.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px}.card strong{display:block;font-size:27px;color:var(--navy)}.card span{font-size:12px;color:#6f808b}.warning{border:1px solid #edcf97;background:#fff9eb;border-radius:12px;padding:16px;color:#79511d;margin:18px 0;font-size:14px}.primary{background:var(--teal);color:white;border-color:var(--teal)}.primary:hover:not(:disabled){background:#06675f;color:white}.center{text-align:center}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.center .actions{justify-content:center}.exam-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:24px}.exam-top{display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;background:#f6f8faf5;z-index:5;padding:12px 0;margin-bottom:16px}.timer{font-variant-numeric:tabular-nums;font-size:22px;color:var(--teal);font-weight:800}.timer.urgent{color:#bb3535}.question{font-size:20px;overflow-wrap:anywhere;white-space:pre-wrap;margin:22px 0}.choices{display:grid;gap:12px}.choice{text-align:left;display:flex;align-items:flex-start;gap:14px;padding:16px}.choice.selected{border:2px solid var(--teal);background:#e8f5f2}.choice b{border:1px solid #cbd5d9;border-radius:50%;width:28px;height:28px;flex-shrink:0;text-align:center}.numbers{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}.numbers button{padding:3px;min-height:38px;border-radius:7px;font-size:12px}.numbers .answered{background:#e8f5f2;color:var(--teal)}.numbers .current{border:2px solid var(--teal)}progress{width:100%;accent-color:var(--teal)}.result-score{font-size:58px;font-weight:800;color:var(--teal)}.fail{color:#b14343}.review{margin:18px 0;overflow-wrap:anywhere}.review .correct{background:#edf7f2;padding:12px;border-radius:8px}.review .incorrect{color:#b14343}.review ol{padding-left:24px}.filters{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:20px}input,select{padding:12px;border:1px solid #d8e0e3;border-radius:9px;max-width:100%;background:white}input{flex:1;min-width:150px}.pagination{display:flex;align-items:center;gap:15px;margin:20px 0}footer{padding:24px;text-align:center;color:#7d8993;font-size:11px}#notice:not(:empty){padding:14px;background:#fff1d7;color:#79511d}dialog{border:0;border-radius:18px;max-width:440px;width:calc(100% - 32px);padding:28px}dialog::backdrop{background:#152d3870}dialog .actions{justify-content:flex-end}details summary{cursor:pointer} .mono{font-variant-numeric:tabular-nums}
@media(max-width:1000px){aside{width:205px;padding:24px 12px}.shell{margin-left:205px}main{padding:24px}.exam-grid{grid-template-columns:minmax(0,1fr)}.numbers{grid-template-columns:repeat(10,minmax(0,1fr))}.cards{gap:10px}.card{padding:16px}}
@media(max-width:680px){aside{position:static;width:100%;padding:16px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:19px}.caption,.aside-bottom{display:none}nav{display:flex;gap:6px;margin-top:16px}nav button{flex:1;font-size:11px;padding:9px 4px}.shell{margin:0}header{padding:12px 18px}main{padding:20px 14px}.hero{padding:26px 22px}.cards{grid-template-columns:repeat(2,1fr)}.panel{padding:20px 16px}.question{font-size:18px}.choices button{font-size:15px}.exam-top{top:0}.numbers{grid-template-columns:repeat(6,minmax(0,1fr))}.filters>*{width:100%}h1{font-size:25px}footer{padding:18px}.actions button{flex:1}.badge{font-size:10px}}
.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.mode-grid .panel{display:flex;flex-direction:column;align-items:center}.mode-grid h2{font-size:26px}.mode-grid .actions{margin-top:auto;padding-top:24px}.practice-mode{background:linear-gradient(145deg,#fff,#edf8f5)}.subject-picker{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:20px 0}.subject-picker button{font-size:13px;padding:9px 12px}.subject-picker .picked{background:var(--teal);color:white;border-color:var(--teal)}.practice-toolbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:20px 0}.practice-toolbar label{margin-left:auto;font-size:12px}.practice-toolbar select{max-width:260px}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}.bookmark-button{font-size:12px;padding:8px 12px;flex-shrink:0}.bookmark-button[aria-pressed=true]{color:#8d6200;background:#fff8df;border-color:#e4c968}.answer-feedback{padding:16px;border-radius:10px;margin:20px 0;font-weight:700}.answer-feedback.good{background:#e8f5f2;color:#087f76}.answer-feedback.bad{background:#fff0ee;color:#a53636}.choice:disabled{opacity:1}.choice.answer-correct{background:#e8f5f2;border:2px solid var(--teal)}.practice-explanation{background:#f6f8fa;padding:20px;border-radius:12px;overflow-wrap:anywhere}.practice-question{overflow-wrap:anywhere}.practice-question .question{white-space:pre-wrap}kbd{border:1px solid #cbd5d9;background:white;border-radius:5px;padding:2px 7px;font-size:12px}.collection-item{margin:16px 0}.history-panel{margin-top:24px}#question-title{scroll-margin-top:90px}
@media(max-width:1000px){.mode-grid{grid-template-columns:1fr}.practice-toolbar label{margin-left:0}}
@media(max-width:680px){nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}nav button{min-width:0;font-size:11px}.practice-toolbar{gap:10px}.practice-toolbar label,.practice-toolbar select{width:100%;max-width:100%}.question-meta{align-items:flex-start}.question-meta>.muted{min-width:0}.subject-picker{width:100%}.subject-picker button{width:100%}.mode-grid .actions{width:100%}}
/* Match the reference dashboard: quiet heading, navy exam card, white practice card. */
.hero{padding:0;background:transparent;color:var(--navy);border-radius:0}.hero h1{font-size:28px}.hero p{color:#8b969e;font-size:13px;margin:8px 0}.hero .tag{background:transparent;color:var(--teal);padding:0}.criteria-note{font-size:12px;color:#7d8993;margin:18px 0 24px}.mode-grid .panel{align-items:stretch;text-align:left;border-radius:13px;padding:28px 30px 23px}.mode-grid h2{font-size:24px;margin-top:22px}.mode-grid .tag{align-self:flex-start}.exam-mode{background:linear-gradient(115deg,#163b44,#182d39);color:white}.exam-mode p,.exam-mode .muted{color:#b9cccf;font-size:13px}.exam-mode .tag{background:#ffffff10;color:#bed0d2}.mode-facts{display:flex;gap:22px;margin:22px 0;color:#b5c9cb;font-size:13px}.exam-mode .primary{background:#e4f5ee;color:#265b52;border:0}.exam-mode .primary:hover:not(:disabled){background:#ccebdc;color:#265b52}.practice-mode{background:white}.practice-mode p{color:#7d8993;font-size:13px}.mode-grid .subject-picker{justify-content:flex-start;margin:18px 0}.mode-grid .actions{width:100%;gap:8px}.mode-grid .actions button{flex:1}.mode-grid .subject-picker button{font-size:12px;padding:8px 10px}.mode-grid .subject-picker .picked{background:#eaf6f1;color:var(--teal);border-color:#c9e4da}
@media(max-width:680px){.hero h1{font-size:25px}.mode-grid .panel{padding:24px 20px}.mode-grid .subject-picker button{width:100%;min-height:44px}}
.practice-question .choice.selected:disabled:not(.answer-correct){border-color:#cf6c61;background:#fff1ee}
aside{overflow-y:auto}.study-tools{margin-top:auto;padding:32px 9px 0;color:#7f8f94}.local-note{display:flex;gap:9px;align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:13px}.study-tools svg{width:17px;height:17px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.local-note>svg{width:20px;height:20px;margin-top:2px}.local-note strong{font-size:11px;color:#536c73;font-weight:600}.local-note p{font-size:9px;margin:5px 0 0;color:#95a0a5;white-space:nowrap}.study-tools .text-button{display:flex;align-items:center;gap:6px;padding:6px 0;min-height:34px;background:none;border:0;border-radius:4px;font-size:11px;color:#8f9ba1}.study-tools .text-button:hover{color:var(--teal);background:#f3f8f7}.sidebar-disclaimer{font-size:9px;color:#a0a9af;line-height:1.8;margin:16px 0 0}.danger{background:#ab3737;color:white;border-color:#ab3737}
@media(max-width:680px){.study-tools{display:grid;grid-template-columns:1fr 1fr;gap:4px 12px;padding:18px 4px 0}.local-note{grid-column:1/-1;padding-bottom:12px;margin-bottom:4px}.study-tools .text-button{min-height:44px}.sidebar-disclaimer{display:none}}
.danger:hover:not(:disabled){background:#8e2929;color:#fff;border-color:#8e2929}