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summary:before{content:"+ ";white-space:pre}.original[open] summary:before{content:"− "}.original p{color:var(--muted);font-size:.875rem}.actions{grid-template-columns:1fr auto;gap:8px;margin-top:28px;display:grid}.upload-form{gap:16px;display:grid}.upload-form label{gap:8px;font-weight:600;display:grid}.upload-form input[type=file]{border:1px solid var(--line);background:var(--surface);border-radius:6px;width:100%;padding:14px}.edit-class{border:1px solid var(--line);background:var(--surface);border-radius:12px;margin-top:28px}.edit-class>summary{cursor:pointer;padding:16px;font-weight:600;list-style:none}.edit-class>summary::-webkit-details-marker{display:none}.edit-class>summary:after{content:"+";float:right;color:var(--muted)}.edit-class[open]>summary:after{content:"−"}.edit-class-body{border-top:1px solid var(--line);padding:18px 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0;font-size:1.25rem}.profile-weaknesses{gap:10px;display:grid}.profile-weakness{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:0 14px}.profile-weakness summary{cursor:pointer;justify-content:space-between;align-items:center;gap:12px;min-height:48px;font-weight:600;list-style:none;display:flex}.profile-weakness summary::-webkit-details-marker{display:none}.profile-weakness .terms{padding-bottom:8px}.profile-card{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:16px}.profile-card h3{margin:18px 0 8px;font-size:1rem}.profile-card h3:first-child{margin-top:0}@media (max-width:480px){.profile-hero{align-items:start;display:grid}.profile-hero .button{width:100%}}.profile-section{margin-top:28px}.profile-section h2{margin:0 0 12px;font-size:1.25rem}.profile-action{margin-top:12px}.attempt-result{border-top:1px solid var(--line);gap:8px;margin-top:20px;padding-top:20px;display:grid}.attempt-result h3,.attempt-result h4{margin:10px 0 0;font-size:1rem}.attempt-result h3{font-size:1rem}.tone-base{--tone:var(--score-base)}.tone-low{--tone:var(--score-low)}.tone-mid{--tone:var(--score-mid)}.tone-high{--tone:var(--score-high)}.tone-top{--tone:var(--score-top)}.attempt-result{position:relative;overflow:hidden}.score-head{align-items:center;gap:18px;display:flex}.score-meta{gap:8px;min-width:0;display:grid}.score-ring{flex-shrink:0;width:120px;height:120px;position:relative}.score-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.score-ring circle{fill:none;stroke-width:10px}.score-ring-track{stroke:var(--line)}.score-ring-value{stroke:var(--tone);stroke-linecap:round}.score-ring-label{text-align:center;place-content:center;display:grid;position:absolute;inset:0}.score-ring-label strong{font-variant-numeric:tabular-nums;letter-spacing:-.01em;font-size:2.75rem;line-height:1}.score-ring-label 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.stat-row{visibility:hidden}.panel-score{align-items:baseline;gap:6px;margin-top:2px;display:flex}.panel-score strong{letter-spacing:-.01em;color:var(--tone);font-size:2.75rem;font-weight:700;line-height:1}.panel-score>span:not(.delta){color:var(--muted);font-weight:600}.trend-chart{width:100%;height:auto;color:var(--accent);margin:10px 0 6px;display:block;overflow:visible}.trend-guide{stroke:var(--line);stroke-dasharray:3 5}.trend-label{fill:var(--muted);font-size:11px}.trend-dot{fill:var(--surface);stroke:currentColor;stroke-width:2.5px}.kpi-grid{grid-template-columns:repeat(2,1fr);gap:10px;display:grid}@media (min-width:560px){.kpi-grid{grid-template-columns:repeat(3,1fr)}}.kpi-tile{border:1px solid 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var(--line);background:var(--surface);border-radius:12px;align-items:center;gap:14px;padding:14px 16px;transition:border-color .15s;display:flex}.class-card:hover{border-color:var(--accent)}.class-index{background:var(--accent-soft);width:40px;height:40px;color:var(--accent);font-variant-numeric:tabular-nums;border-radius:12px;flex-shrink:0;place-items:center;font-weight:700;display:grid}.words-section{margin-top:12px;scroll-margin-top:20px}.exercise-page{gap:18px}.exercise-page header h1{margin-bottom:20px}.new-exercise{padding:0}.new-exercise>summary{color:var(--accent);cursor:pointer;padding:16px 20px;font-weight:700;list-style:none}.new-exercise>summary::-webkit-details-marker{display:none}.new-exercise>form{padding:0 20px 20px}.exercise-card{border-radius:12px;transition:border-color .15s}.xp-bar{background:var(--surface);border:1px solid 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var(--score-base) 14%, transparent)}.attempt-states{align-items:center;gap:6px;display:inline-flex}.attempt.is-shown{color:var(--text)}.attempt.button{border-radius:12px;min-height:44px;padding:9px 14px}.teacher-note{border-left:3px solid var(--score-base);background:color-mix(in srgb, var(--score-base) 8%, transparent);border-radius:12px;gap:4px;margin-bottom:14px;padding:12px 14px;display:grid}.teacher-note.is-good{border-left-color:var(--score-high);background:color-mix(in srgb, var(--score-high) 8%, transparent)}.submit-box,.review-box{border-top:1px solid var(--line);gap:8px;margin-top:16px;padding-top:16px;display:grid}.review-box textarea{border:1px solid var(--line);background:var(--bg);width:100%;font:inherit;resize:vertical;border-radius:6px;padding:11px 12px}.skill-tabs{background:var(--surface-2);border-radius:12px;gap:6px;margin:0 0 16px;padding:4px;display:flex}.skill-tabs a{min-height:40px;color:var(--muted);border-radius:6px;flex:1;justify-content:center;align-items:center;gap:6px;font-size:.875rem;font-weight:600;display:inline-flex}.skill-tabs a.is-on{background:var(--surface);color:var(--text);box-shadow:var(--glow)}.tab-count{background:var(--accent);min-width:20px;color:var(--on-accent);text-align:center;border-radius:999px;padding:0 6px;font-size:.8125rem;line-height:20px}.type-picker{flex-wrap:wrap;gap:6px;display:flex}.type-picker label{border:1px solid var(--line);color:var(--text-2);cursor:pointer;border-radius:6px;align-items:center;padding:8px 12px;font-weight:600;display:inline-flex}.type-picker label.is-on{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.type-picker input{opacity:0;pointer-events:none;position:absolute}.exercise-form select{border:1px solid var(--line);background:var(--bg);border-radius:6px;width:100%;padding:11px 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