/* BRAIVの黒・赤・白と余白を、1項目ずつ読む学習画面へ。 */
:root{--ink:#211b1b;--muted:#706667;--green:#df101d;--green-dark:#171010;--lime:#fff0ec;--paper:#faf8f6;--line:#e7dfdc;--red:#b51722;--radius:12px;background:var(--paper);color:var(--ink)}
body{font-weight:500}a,button,input,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #e30b17;outline-offset:4px}
.sidebar{display:none}.app-shell{margin-left:0}.topbar{height:72px;padding:0 max(24px,calc((100vw - 760px)/2));background:#171010;color:#fff;border:0;position:relative;z-index:10}.desktop-title{display:none}.mobile-brand{display:block;text-decoration:none;font-size:21px;letter-spacing:.02em;font-weight:800}.mobile-brand span{color:#ff554a;margin-left:4px}.mobile-brand small{font-size:11px;color:#c5b7b6;margin-left:10px}.mobile-brand:after{content:"";display:block;background:#e30b17;width:30px;height:3px;margin-top:5px}
.app-menu{position:relative;font-size:13px}.app-menu>summary{cursor:pointer;padding:14px 4px;list-style:none;font-weight:700}.app-menu>summary::-webkit-details-marker{display:none}.app-menu>summary:after{content:" +";color:#ff554a}.app-menu[open]>summary:after{content:" −"}.app-menu nav{position:absolute;right:0;top:46px;width:220px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 40px #17101022;color:var(--ink)}.app-menu nav a{display:block;text-decoration:none;padding:13px 15px;min-height:48px}.app-menu nav a:hover{background:#fff0ed}
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.memory-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;gap:12px}.memory-heading h1{font-size:30px;margin:9px 0 0}.memory-count{font-size:28px;font-weight:800;white-space:nowrap}.memory-count small{font-size:14px;color:var(--muted);font-weight:500}progress::-webkit-progress-bar{background:#eae2df}progress::-webkit-progress-value{background:#df101d}progress::-moz-progress-bar{background:#df101d}.memory-status{display:flex;align-items:flex-start;justify-content:space-between;font-size:12px;color:#766668;margin:13px 0 23px;gap:10px;position:relative;min-height:26px}.memory-filter>summary{cursor:pointer;font-size:12px;font-weight:600;min-height:30px;text-align:right}.memory-filter .field-chips{position:absolute;right:0;top:34px;max-width:100%;background:#fff;z-index:3;padding:12px;border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 30px #17101010}
.recall-card{padding:28px;background:white;border:1px solid var(--line);border-top:4px solid #df101d;border-radius:10px;min-height:330px;display:flex;flex-direction:column}.recall-card.mastered{background:#fff7f3;border-color:#efb6b1;border-top-color:#df101d}.recall-field{font-size:12px;color:#a92129;margin-bottom:22px}.recall-card h2{font-size:16px;font-weight:600;color:#766668;line-height:1.7;margin:0 0 15px}.recall-card .memory-rule{font-size:25px;line-height:1.85;font-weight:750;letter-spacing:-.02em;margin:0 0 26px;overflow-wrap:anywhere}.recall-card .memory-toggle{align-self:flex-end;margin-top:auto;gap:10px;color:#453738;font-size:15px;min-height:52px}.memory-toggle input{width:24px;height:24px;accent-color:#df101d}.recall-test{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:60px;padding:12px 4px;font-size:15px;text-decoration:none}.recall-test span{color:#df101d}.recall-footer{display:flex;gap:12px;margin-top:12px}.recall-footer .button:first-child{flex:0 0 30%}.recall-footer .button:last-child{flex:1}.recall-note{font-size:12px;color:#857879;text-align:center;margin:20px 0 0}
.quiz-meta{margin-bottom:15px;flex-wrap:nowrap;gap:8px;font-size:14px}.quiz-meta>strong{font-size:24px;font-weight:800}.quiz-meta>strong small{font-size:13px;color:var(--muted);font-weight:500}.quiz-mode-label{font-size:11px;color:var(--muted)}.quiz-meta .subtle-link{font-size:14px;text-decoration:none}.quiz-meta .timer{font-size:16px}.quiz-progress{margin-bottom:25px;height:4px}.quiz-layout{display:block}.question{padding:0;border:0;background:transparent;border-radius:0}.question-tools{margin:0 0 12px}.quiz-topic{font-size:12px;color:#8a252b;font-weight:650}.favorite{font-size:24px;border:0;color:#7e6c6e;padding:5px 10px;min-height:44px;line-height:1}.favorite.is-favorite{background:#ffefdf;color:#a34a00}.question h1{font-size:21px;line-height:1.95;margin:8px 0 25px;font-weight:700;letter-spacing:0}.option-list{gap:14px}.option{background:#fff;border-color:#ded3d0;border-radius:10px;font-size:18px;line-height:1.95;padding:20px 16px;gap:14px;min-height:76px}.option:hover{background:#fffaf8;border-color:#dca19f}.option.selected{background:#fff3ef;border-color:#df101d;padding:19px 15px}.option-num{width:30px;height:30px;font-size:14px;background:#faf6f4;border-color:#e1d7d3;font-weight:700;margin-top:3px}.option.selected .option-num{background:#df101d;border-color:#df101d}.option.correct{background:#f0f5f1;border-color:#66816d}.option.incorrect{background:#fff0ed;border-color:#c42b34}.question-index{position:static;border:0;border-top:1px solid var(--line);background:transparent;padding:12px 0 0;margin-top:32px;border-radius:0}.question-index summary{color:#7b686a;font-size:13px!important}.question-index .number-grid button{min-height:44px;color:#5c494a;font-size:13px}.number-grid button.current{background:#fff0ed;border-color:#df101d;color:#a61a23}.number-grid button.answered{background:#efe7e4}.explanation{margin-top:0}.answer-banner{border-radius:9px;font-size:21px;background:#eef4ef;color:#2f5c3d;padding:20px}.answer-banner.wrong{background:#fff0ed;color:#ab1622}.answer-banner small{font-size:13px;margin-top:6px}.study-point{background:white;border:1px solid var(--line);border-top:4px solid #df101d;border-radius:10px;padding:24px;margin:20px 0}.study-point>strong{font-size:12px;color:#a91d27}.study-point p{font-size:24px;line-height:1.85;font-weight:750;margin:15px 0 0;letter-spacing:-.02em}.explanation>.answer-details,.explanation>.source-box,.question-recap{border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;padding:0;margin:0}.answer-details>summary,.source-box>summary,.question-recap>summary{padding:18px 2px;min-height:56px;font-size:14px;color:#695558;font-weight:600;cursor:pointer}.explanation details details{background:#fff;border:1px solid var(--line);border-radius:8px;margin:10px 0;padding:15px}.explanation details details p{font-size:17px;line-height:2}.explanation .source-box p{font-size:13px}.question-recap[open]{padding-bottom:20px}.quiz-footer .button{font-size:16px}.score-card{background:#171010}.score-card .eyebrow{color:#ffb2a7}.score-big small{color:#d0bdb9}.tag{background:#fff3ef;border-color:#ecd6d1;color:#8c282e}.tag.priority-A,.tag.priority-B,.tag.priority-C{background:#fff3ef;border-color:#ecd6d1}.empty{background:#fff;color:#79676a}.nav-link.active{color:#a91923;background:#fff0ed}.status-dot{background:#df101d}#toast{background:#211b1b}footer{color:#8b7a7d;font-size:10px;padding:22px 24px 100px}.report-header{background:#171010;color:white;border:0}.report-header small{color:#f2a49d}.report-jump a{background:#fff0ed;color:#a91923}.report-field h2 small{color:#8c797a}.report-bottom-nav{background:#fff}.report-bottom-nav a{color:#aa1824}.memory-card:not(.recall-card){background:white}.memory-card-top>span{color:#986268}.memory-question-link{color:#ac1823}
@media(min-width:851px){.mobile-nav{display:flex;position:fixed;inset:auto 0 0;z-index:5;justify-content:center;background:#fffffff5;border-top:1px solid var(--line);padding:8px;gap:24px}.mobile-nav a{min-width:160px;justify-content:center}.simple-hero h1{font-size:56px}.simple-hero{padding:42px}.simple-entries{grid-template-columns:1fr 1fr}.in-quiz .mobile-nav{display:none}.quiz-footer{margin:28px 0 0}.quiz-footer .button{min-width:150px}.recall-card .memory-rule{font-size:29px}.in-quiz footer{padding-bottom:30px}}
@media(max-width:850px){.topbar{height:64px;padding:0 20px}.mobile-nav{background:#fffffff7;border-color:var(--line);padding:6px 12px max(6px,env(safe-area-inset-bottom));gap:10px}.mobile-nav a{font-size:12px;color:#79696a;min-height:56px;flex:1;gap:3px}.mobile-nav a.active{background:#fff0ed;color:#b51622;border-radius:8px}.mobile-nav .nav-icon{font-size:22px}.in-quiz .quiz-footer{padding:12px 18px max(12px,env(safe-area-inset-bottom));background:#faf8f6f5;border-color:var(--line);gap:12px}.in-quiz .quiz-footer .button:first-child{flex:0 0 30%}.in-quiz .quiz-footer .button:last-child{flex:1}.in-quiz main{padding-bottom:125px}.in-quiz .question-index{margin-bottom:0}.in-quiz footer{display:none}.in-quiz .topbar{display:none}body[data-page="memorize"] main{padding-bottom:170px}.recall-footer{position:fixed;bottom:76px;left:0;right:0;background:#faf8f6f5;z-index:4;margin:0;padding:12px 18px;max-width:808px;margin-inline:auto;bottom:calc(76px + env(safe-area-inset-bottom))}.recall-note{margin-bottom:0}.recall-card{min-height:330px}.report-bottom-nav{border-color:var(--line)}}
@media(max-width:580px){main{padding:26px 20px 25px}.simple-hero{padding:29px 25px;border-radius:10px}.simple-hero h1{font-size:40px;line-height:1.45;margin:20px 0 14px}.simple-hero p{font-size:15px}.simple-kicker{font-size:10px}.simple-entry{padding:18px;gap:15px;min-height:96px}.simple-entry strong{font-size:23px}.simple-entry small{font-size:11px}.simple-hero{margin-bottom:18px}.simple-review{font-size:15px;padding:22px 2px}.quiet-details{margin:8px 0 18px}.heading-row h1{font-size:28px}.heading-row p{font-size:14px}.memory-heading{margin-bottom:20px}.memory-heading h1{font-size:28px}.recall-card{padding:23px 21px;min-height:310px}.recall-card .memory-rule{font-size:24px;line-height:1.9}.recall-card h2{font-size:15px;margin-bottom:15px}.recall-field{margin-bottom:20px}.recall-test{font-size:14px}.memory-status{margin-bottom:19px}.recall-footer .button{padding-inline:10px;font-size:16px}.quiz-meta{margin-top:0}.question h1{font-size:20px;line-height:1.95}.option{font-size:18px;padding:18px 15px;gap:12px}.option.selected{padding:17px 14px}.option-num{width:28px;height:28px}.study-point{padding:22px 20px}.study-point p{font-size:23px;line-height:1.9}.quiz-mode-label{font-size:10px}.focus-question-row{padding:17px 0;min-height:86px}.scope-tabs a{font-size:12px}.report-header{padding:18px}.report-field .memory-rule{font-size:21px}.report-bottom-nav a{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}