:root{font-family:Inter,"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;color:#19302c;background:#f5f7f5;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px}button,select{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible{outline:3px solid #d5a459;outline-offset:3px}[hidden]{display:none!important}
.app-shell{max-width:840px;margin:0 auto;padding:0 28px}.site-header{height:82px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #dce4df}.brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:800;letter-spacing:.03em}.brand-mark{display:grid;place-items:center;width:29px;height:29px;border-radius:9px;color:#fff;background:#2d695b;font-size:20px;line-height:1}.header-action{border:1px solid #cddad3;border-radius:9px;padding:10px 14px;color:#285e52;background:#fff;font-size:12px;font-weight:700}.header-action:hover{background:#ebf3ee}
.header-controls{display:flex;align-items:center;gap:12px}.sync-status{color:#628473;font-size:11px;font-weight:700}.sync-status::before{content:"";display:inline-block;width:6px;height:6px;margin-right:6px;border-radius:50%;background:#65a781;vertical-align:middle}.sync-status.is-error{color:#b26052}.sync-status.is-error::before{background:#b26052}
.intro{padding:58px 0 37px}.eyebrow{margin:0;color:#6e9a86;font-size:10px;font-weight:800;letter-spacing:.22em}.intro h1{margin:14px 0 15px;font-size:clamp(30px,6vw,47px);line-height:1.36;letter-spacing:-.045em;font-weight:800}.intro-copy{max-width:610px;margin:0;color:#6b7b74;font-size:14px;line-height:1.9}.tabs{display:flex;gap:35px;border-bottom:1px solid #dce4df}.tab{position:relative;border:0;background:none;padding:0 2px 15px;color:#87958d;font-size:13px;font-weight:700}.tab.is-active{color:#245d4f}.tab.is-active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:#2f755f}.view{padding:31px 0 65px;min-height:370px}
.empty-panel{min-height:360px;border:1px dashed #c9d9ce;border-radius:18px;background:#fff;padding:47px 25px;text-align:center}.empty-icon{display:grid;place-items:center;width:56px;height:56px;margin:0 auto 19px;border-radius:16px;color:#3c7a63;background:#e9f3eb;font-size:30px}.empty-panel h2{margin:0 0 9px;font-size:19px}.empty-panel p{max-width:380px;margin:0 auto 23px;color:#74817a;font-size:13px;line-height:1.9}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border:1px solid transparent;border-radius:10px;min-height:50px;padding:11px 19px;font-size:13px;font-weight:800;transition:transform .15s,background .15s}.button:hover{transform:translateY(-1px)}.button-primary{background:#286b56;color:#fff}.button-primary:hover{background:#1c5745}.button-wide{width:100%;justify-content:space-between;padding-left:22px;padding-right:22px}.text-button{border:0;background:none;color:#2b735c;font-size:12px;font-weight:800;text-decoration:underline;text-underline-offset:3px}.empty-panel .text-button{display:block;margin:16px auto 0}
.study-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:25px}.deck-summary{display:flex;gap:9px;align-items:center;color:#536f5f;font-size:12px;font-weight:700;min-width:0}.deck-summary span:nth-child(2){max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.summary-dot{width:7px;height:7px;background:#63a67a;border-radius:50%;flex:none}.summary-divider{color:#c3d2c7}.mode-select-wrap{display:flex;align-items:center;gap:9px;color:#809087;font-size:11px;font-weight:700;flex:none}.mode-select-wrap select{border:1px solid #d8e2d9;border-radius:8px;background:#fff;color:#2c594a;padding:8px 27px 8px 10px;font-size:11px;font-weight:700}.card-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:11px;color:#85948b;font-size:11px;font-weight:700}.flash-card{overflow:hidden;border:1px solid #e1e7df;border-radius:16px;background:#fff;box-shadow:0 12px 28px rgba(31,67,45,.035)}.card-part{padding:29px 31px 35px}.question-part{min-height:210px}.answer-part{border-top:1px solid #e4ebe6;background:#fbfdfb}.card-label{display:flex;align-items:center;gap:9px;margin:0 0 22px;color:#37806a;font-size:11px;font-weight:800;letter-spacing:.07em}.label-line{width:15px;height:2px;background:#65aa84}.card-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:17px;font-weight:700;line-height:1.9;letter-spacing:.015em}.answer-part .card-text{font-weight:500}.answer-actions{margin-top:17px}.grade-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px}.button-wrong{color:#a05646;background:#fff;border-color:#e8cfc6}.button-wrong:hover{background:#fdf4f0}.button-correct{color:#fff;background:#286b56}.button-correct:hover{background:#1c5745}.study-hint{margin:13px 0;text-align:center;color:#99a59e;font-size:11px}
.section-heading{margin:5px 0 25px}.section-heading h2{margin:9px 0 8px;font-size:26px;letter-spacing:-.04em}.section-heading>p:last-child{margin:0;color:#7a8a80;font-size:13px;line-height:1.7}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.stat-card{display:flex;flex-direction:column;gap:20px;min-height:113px;padding:18px;border:1px solid #e1e9e2;border-radius:12px;background:#fff}.stat-card span{color:#7d9085;font-size:11px}.stat-card strong{color:#245f4d;font-size:25px;line-height:1}.list-heading{display:flex;justify-content:space-between;align-items:baseline;margin:37px 0 13px}.list-heading h3{margin:0;font-size:16px}.list-heading span{color:#8b9a91;font-size:11px}.question-stats{display:grid;gap:8px}.question-stat{display:flex;align-items:center;gap:12px;padding:15px 17px;border:1px solid #e2e9e2;border-radius:10px;background:#fff}.question-stat .id{flex:none;color:#3f7b65;font-size:11px;font-weight:800}.question-stat .question{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.question-stat .score{flex:none;color:#708077;font-size:11px}.no-stats{padding:25px;color:#8a988d;text-align:center;font-size:12px;border:1px dashed #d6e2d8;border-radius:10px}.stats-note{margin:22px 0;color:#8e9c92;font-size:11px;line-height:1.7}
.upload-panel{padding:34px 22px;border:1px dashed #b9d2c2;border-radius:15px;background:#fff;text-align:center}.upload-icon{display:grid;place-items:center;margin:0 auto 13px;width:46px;height:46px;border-radius:14px;color:#397d61;background:#e9f4e9;font-size:26px}.upload-panel h3{margin:0 0 5px;font-size:16px}.upload-panel p{margin:0 0 16px;color:#7f9184;font-size:12px}.upload-caption{display:block;margin:11px 0 0;color:#a1afa4;font-size:10px}.format-panel{margin-top:23px;padding:22px;border:1px solid #e1e9e2;border-radius:12px;background:#fff}.format-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.format-head h3{margin:0;font-size:14px}.format-panel pre{overflow:auto;margin:16px 0;padding:17px;border-radius:8px;color:#3a6752;background:#f4f8f4;font-size:12px;line-height:1.8}.format-panel p{margin:0;color:#819084;font-size:11px;line-height:1.8}.format-panel code{font-size:13px}.current-deck{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:18px;padding:18px 21px;border:1px solid #dce9dc;border-radius:12px;background:#edf6ee}.current-deck h3{margin:7px 0 4px;font-size:14px}.current-deck p{margin:0;color:#819487;font-size:11px}.danger{color:#aa675a;flex:none}footer{padding:22px 0 30px;border-top:1px solid #e3e9e3;color:#a0ada2;text-align:center;font-size:11px}.toast{position:fixed;z-index:10;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);max-width:min(90vw,460px);padding:12px 18px;border-radius:10px;background:#214b3e;color:#fff;box-shadow:0 10px 30px #183d3233;text-align:center;font-size:12px;line-height:1.5}
@media(max-width:600px){.app-shell{padding:0 20px}.site-header{height:68px}.header-controls{gap:8px}.sync-status{max-width:78px;font-size:9px;line-height:1.2}.header-action{padding:9px;font-size:10px}.intro{padding:39px 0 31px}.intro h1{font-size:32px}.intro-copy{font-size:12px}.tabs{gap:26px}.view{padding-top:25px}.card-part{padding:24px 22px 28px}.question-part{min-height:200px}.card-text{font-size:16px}.study-toolbar{align-items:flex-start}.mode-select-wrap span{display:none}.stat-grid{grid-template-columns:repeat(2,1fr)}.stat-card{min-height:105px}.question-stat{flex-wrap:wrap}.question-stat .question{flex-basis:calc(100% - 55px)}.question-stat .score{margin-left:auto}.current-deck{align-items:flex-start}.format-head{align-items:flex-start}}
.feedback-editor{width:100%;margin-top:14px;padding:15px;border:1px solid #dce8df;border-radius:11px;background:#fff}.feedback-editor summary{color:#2b735c;font-size:12px;font-weight:800;cursor:pointer}.feedback-editor[open] summary{margin-bottom:14px}.feedback-editor label{display:grid;gap:6px;color:#5d7568;font-size:11px;font-weight:700}.feedback-editor select,.feedback-editor textarea{width:100%;border:1px solid #cadbd0;border-radius:8px;background:#fff;color:#19302c;padding:10px;font:inherit;font-size:13px}.feedback-editor textarea{display:block;margin:12px 0;resize:vertical;line-height:1.6}.feedback-editor textarea:focus-visible,.feedback-editor select:focus-visible{outline:3px solid #d5a459;outline-offset:2px}.feedback-editor .button{min-height:42px}.feedback-actions{display:flex;align-items:center;gap:12px}.feedback-status{color:#63836e;font-size:11px}.card-feedback{margin-top:23px}.question-stat{flex-wrap:wrap}.question-stat .feedback-editor{margin-top:0}.feedback-badge{order:3;flex:none;border-radius:99px;background:#eaf3ec;color:#2b735c;padding:5px 8px;font-size:10px;font-weight:700}.question-stat .feedback-editor{order:4}.export-panel{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:22px;padding:21px;border:1px solid #dce9dc;border-radius:12px;background:#fff}.export-panel h3{margin:0 0 5px;font-size:14px}.export-panel p{margin:0;color:#819487;font-size:11px;line-height:1.7}.export-panel .button{flex:none}.button:disabled{opacity:.5;cursor:not-allowed}
@media(max-width:600px){.export-panel{display:block}.export-panel .button{width:100%;margin-top:16px}.question-stat .feedback-editor{flex-basis:100%}}
.login-shell{max-width:420px;margin:0 auto;padding:28px 20px}.login-shell .brand{margin-bottom:80px}.login-card{padding:30px;border:1px solid #dce8df;border-radius:18px;background:#fff;box-shadow:0 12px 28px rgba(31,67,45,.035)}.login-card h1{margin:10px 0;font-size:30px}.login-card>p:not(.eyebrow){margin:0 0 25px;color:#6b7b74;font-size:13px;line-height:1.8}.login-card form{display:grid;gap:12px}.login-card label{font-size:12px;font-weight:800}.login-card input{width:100%;border:1px solid #cadbd0;border-radius:9px;padding:13px;font:inherit;font-size:22px;letter-spacing:.2em;text-align:center}.login-card .button{width:100%}.login-card #loginMessage{min-height:20px;margin:0;color:#b26052;font-size:12px}.header-controls #logoutButton{color:#708077}
.category-setup{padding:27px;border:1px solid #dce8df;border-radius:16px;background:#fff}.category-setup h2{margin:10px 0 7px;font-size:22px}.category-setup>p:not(.eyebrow){color:#728276;font-size:12px;line-height:1.7}.category-fields{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:24px 0 12px}.category-fields label{display:grid;gap:7px;color:#5e7666;font-size:11px;font-weight:800}.category-fields select{min-width:0;width:100%;padding:12px;border:1px solid #cadbd0;border-radius:9px;background:#fff;color:#19302c;font:inherit;font-size:12px}.category-count{margin:15px 0!important;color:#2b735c!important;font-weight:800}.study-toolbar #changeCategory{white-space:nowrap}.level-badge{flex:none;border-radius:99px;background:#edf1f8;color:#526b8c;padding:5px 8px;font-size:10px;font-weight:700}@media(max-width:600px){.category-fields{grid-template-columns:1fr}.study-toolbar{flex-wrap:wrap}.study-toolbar #changeCategory{order:3;margin-left:auto}}