.practice-shell{padding:42px 0 86px}.practice-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:end;margin-bottom:18px}.practice-head h1{margin:5px 0 8px;font-size:44px;line-height:1.08;letter-spacing:-.045em}.practice-head p{margin:0;color:var(--muted);font-size:13px;line-height:1.75}.practice-guide{border:1px solid var(--line);border-radius:22px;background:var(--card);padding:17px 18px;margin-bottom:14px}.practice-guide summary{cursor:pointer;font-size:13px;font-weight:850;list-style:none}.practice-guide summary::-webkit-details-marker{display:none}.practice-guide summary:after{content:'＋';float:right;color:var(--muted);font-weight:500}.practice-guide[open] summary:after{content:'−'}.practice-guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin-top:14px}.practice-guide-grid article{padding:13px;border:1px solid var(--line);border-radius:15px;background:var(--soft)}.practice-guide-grid strong{display:block;font-size:12px}.practice-guide-grid p{margin:5px 0 0;color:var(--muted);font-size:11px;line-height:1.65}.practice-rule{display:flex;gap:12px;align-items:flex-start;margin-top:10px;padding:12px 13px;border:1px solid color-mix(in srgb,var(--red) 17%,var(--line));border-radius:14px;background:color-mix(in srgb,var(--red) 4%,var(--card));font-size:11px;line-height:1.65}.practice-rule strong{color:var(--red);white-space:nowrap}.practice-rule span{color:var(--muted)}
.practice-metrics{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:9px;margin-bottom:12px}.practice-metric{padding:15px 16px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.practice-metric span{display:block;color:var(--muted);font-size:9px;font-weight:780;letter-spacing:.03em}.practice-metric strong{display:block;margin-top:4px;font-size:25px;line-height:1.15;letter-spacing:-.04em;font-variant-numeric:tabular-nums}.practice-progress-card{padding:15px 17px;border:1px solid var(--line);border-radius:19px;background:var(--card);margin-bottom:12px}.practice-progress-card>div:first-child{display:flex;align-items:center;justify-content:space-between;gap:14px;font-size:11px;font-weight:800}.practice-progress-track{height:8px;margin-top:8px;border-radius:999px;background:var(--soft);overflow:hidden}.practice-progress-track i{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--red),#ff6b75);transition:width .22s ease}.practice-message{margin:9px 0 0;color:var(--muted);font-size:10px}.practice-message.success{color:#25734c}.practice-message.error{color:var(--red)}
.practice-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:12px 0}.practice-tabs button{min-height:48px;padding:0 12px;border:1px solid var(--line);border-radius:15px;background:var(--card);color:var(--muted);font:inherit;font-size:12px;font-weight:800;cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease,transform .12s ease}.practice-tabs button span{margin-left:5px;font-size:9px;font-weight:700;opacity:.75}.practice-tabs button.active{background:var(--ink);border-color:var(--ink);color:var(--paper)}.practice-tabs button:active{transform:scale(.98)}
.practice-toolbar{display:grid;grid-template-columns:minmax(230px,1fr) minmax(180px,.48fr) minmax(170px,.42fr);gap:8px;padding:10px;border:1px solid var(--line);border-radius:19px;background:var(--card);margin-bottom:12px;position:relative;z-index:8}.practice-search{min-height:48px;display:grid;grid-template-columns:24px minmax(0,1fr);align-items:center;gap:6px;padding:0 12px;border:1px solid var(--line);border-radius:15px;background:var(--card)}.practice-search>span{display:grid;place-items:center;color:var(--muted);font-size:17px}.practice-search input{min-width:0;width:100%;height:46px;border:0;outline:0;background:transparent;color:var(--ink);font:inherit;font-size:12px}.practice-toolbar-actions{grid-column:1/-1;display:flex;gap:7px;flex-wrap:wrap}.practice-action{min-height:38px;padding:0 12px;border:1px solid var(--line);border-radius:11px;background:var(--card);color:var(--ink);font:inherit;font-size:10px;font-weight:780;cursor:pointer}.practice-action:hover{background:var(--soft)}.practice-action:active{transform:scale(.98)}.practice-action.primary{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.practice-chapter{border:1px solid var(--line);border-radius:21px;background:var(--card);overflow:hidden;margin-bottom:12px}.practice-chapter>header{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 17px;border-bottom:1px solid var(--line);background:var(--soft)}.practice-chapter header span{font-size:8px;letter-spacing:.15em;color:var(--red);font-weight:900}.practice-chapter header h3{margin:2px 0 0;font-size:16px;line-height:1.35}.practice-chapter header>strong{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.practice-source-rows{display:grid}.practice-source-row{display:grid;grid-template-columns:minmax(180px,.72fr) minmax(360px,1.5fr) minmax(220px,.8fr);gap:12px;align-items:start;padding:13px 15px;border-top:1px solid var(--line);transition:background .14s ease}.practice-source-row:first-child{border-top:0}.practice-source-row.done{background:color-mix(in srgb,#25a86a 5%,var(--card))}.practice-source-row.none{opacity:.64}.practice-point strong{display:block;font-size:11px;line-height:1.45}.practice-point span{display:block;margin-top:4px;color:var(--muted);font-size:9px}.practice-question-chips{display:flex;flex-wrap:wrap;gap:6px}.practice-question-chip{min-height:31px;padding:0 9px;border:1px solid #d9dde2;border-radius:999px;background:var(--card);color:#41464f;font:inherit;font-size:10px;font-weight:760;cursor:pointer;transition:transform .12s ease,background .14s ease,border-color .14s ease,color .14s ease}.dark .practice-question-chip{color:var(--ink)}.practice-question-chip:hover{border-color:color-mix(in srgb,var(--ink) 25%,var(--line))}.practice-question-chip.checked{background:#25a86a;border-color:#25a86a;color:#fff}.practice-question-chip:active{transform:scale(.95)}.practice-no-question{display:inline-flex;align-items:center;min-height:31px;color:var(--muted);font-size:10px}.practice-row-side{display:grid;grid-template-columns:auto minmax(0,1fr);gap:7px;align-items:center}.practice-row-check{min-height:38px;padding:0 9px;border:1px solid var(--line);border-radius:11px;background:var(--soft);display:flex;align-items:center;gap:6px;cursor:pointer;color:var(--muted);font-size:9px;font-weight:760;white-space:nowrap}.practice-row-check input{position:absolute;opacity:0;pointer-events:none}.practice-row-check i{width:17px;height:17px;border:1.8px solid #b9bec5;border-radius:6px;background:var(--card);position:relative;flex:0 0 17px}.practice-row-check input:checked+i{background:#25a86a;border-color:#25a86a}.practice-row-check input:checked+i:after{content:'';position:absolute;left:5px;top:2px;width:4px;height:8px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}.practice-row-note{width:100%;min-height:38px;border:1px solid var(--line);border-radius:11px;background:var(--paper);color:var(--ink);padding:0 10px;font:inherit;font-size:10px}.practice-row-note:focus{outline:none;border-color:color-mix(in srgb,var(--ink) 28%,var(--line));box-shadow:0 0 0 3px color-mix(in srgb,var(--ink) 6%,transparent)}.practice-empty{padding:54px 22px;border:1px dashed var(--line);border-radius:21px;background:var(--card);text-align:center;color:var(--muted)}.practice-empty strong{display:block;color:var(--ink);font-size:17px}.practice-empty p{max-width:600px;margin:7px auto 0;font-size:11px;line-height:1.7}
@media(max-width:980px){.practice-metrics{grid-template-columns:repeat(3,minmax(0,1fr))}.practice-source-row{grid-template-columns:1fr}.practice-row-side{grid-template-columns:120px minmax(0,1fr)}.practice-guide-grid{grid-template-columns:1fr}.practice-toolbar{grid-template-columns:1fr 1fr}.practice-search{grid-column:1/-1}.practice-toolbar-actions{grid-column:1/-1}}
@media(max-width:640px){.practice-shell{padding:27px 0 58px}.practice-head{grid-template-columns:1fr;align-items:start}.practice-head h1{font-size:33px}.practice-guide{padding:15px;border-radius:19px}.practice-rule{display:grid;gap:4px}.practice-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.practice-metric{padding:13px;border-radius:16px}.practice-metric strong{font-size:22px}.practice-tabs{grid-template-columns:repeat(2,1fr);gap:7px}.practice-tabs button{min-height:46px}.practice-toolbar{grid-template-columns:1fr;padding:8px}.practice-search{grid-column:auto}.practice-toolbar-actions{grid-column:auto;display:grid;grid-template-columns:1fr 1fr}.practice-action{min-height:42px}.practice-chapter{border-radius:18px}.practice-chapter>header{padding:13px}.practice-source-row{padding:13px}.practice-question-chip{min-height:34px;padding-inline:10px}.practice-row-side{grid-template-columns:1fr}.practice-row-check{width:max-content}.practice-row-note{min-height:43px;font-size:11px}.practice-progress-card{border-radius:17px}}
@media(max-width:360px){.practice-metrics{grid-template-columns:1fr 1fr}.practice-toolbar-actions{grid-template-columns:1fr}.practice-tabs{grid-template-columns:1fr 1fr}}