.os-mobile-root{--gutter:9px;--r-card:3px;--r-btn:3px;--r-img:3px;--pu:var(--color-lang-purple,#7c52d4);--puh:var(--color-lang-purple-hover,#6b43c4);--putint:#f3e8ff;--bd:var(--color-border-subtle,#e5e8ee);--bg-app:var(--color-bg-app,#fff);--bg-subtle:var(--color-bg-subtle,#f8fafc);--text-main:var(--color-ink-primary,#0b0d12);--text-sub:var(--color-ink-tertiary,#64748b);background:var(--bg-app);width:100%;max-width:480px;min-height:100vh;color:var(--text-main);font-family:var(--font-text,system-ui, -apple-system, sans-serif);padding:12px var(--gutter) calc(76px + env(safe-area-inset-bottom));box-sizing:border-box;margin-inline:auto}.os-mobile-root *,.os-mobile-root :before,.os-mobile-root :after{box-sizing:border-box}.os-hero{justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;padding:0 1px;display:flex}.os-hero-left{flex:1;align-items:center;gap:12px;min-width:0;display:flex}.os-hero-avatar-box{border-radius:var(--r-card);background:#e0d7fa;border:1px solid #7c52d433;flex-shrink:0;justify-content:center;align-items:center;width:62px;height:62px;display:flex;overflow:hidden}.os-hero-avatar-img{object-fit:contain;width:52px;height:52px}.os-hero-info{flex-direction:column;min-width:0;display:flex}.os-hero-name{font-family:var(--font-display,inherit);letter-spacing:-.015em;color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:20px;font-weight:700;line-height:1.25;overflow:hidden}.os-hero-path{color:var(--text-sub);white-space:nowrap;text-overflow:ellipsis;margin-top:3px;font-size:13px;overflow:hidden}.os-hero-pills{flex-shrink:0;align-items:center;gap:6px;display:flex}.os-pill{background:var(--putint);color:var(--pu);white-space:nowrap;border-radius:9999px;align-items:center;gap:4px;padding:4px 10px;font-size:13px;font-weight:700;line-height:1.3;display:inline-flex}.os-guest-banner{border-radius:var(--r-card);background:#fbf9fe;border:1px solid #e9d5ff;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;padding:10px 12px;display:flex}.os-guest-banner-text{color:#6b21a8;font-size:13px;font-weight:600}.os-guest-banner-btn{background:var(--pu);color:#fff;border-radius:var(--r-btn);cursor:pointer;white-space:nowrap;border:none;flex-shrink:0;justify-content:center;align-items:center;min-height:44px;padding:0 14px;font-size:13px;font-weight:700;text-decoration:none;display:inline-flex}.os-stats-strip{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;grid-template-columns:repeat(4,1fr);margin-bottom:12px;display:grid;overflow:hidden}.os-stat-col{text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:12px 4px;display:flex;position:relative}.os-stat-col:not(:last-child):after{content:"";background:var(--bd);width:1px;position:absolute;top:12px;bottom:12px;right:0}.os-stat-val{color:var(--text-main);font-size:17px;font-weight:700;line-height:1.2}.os-stat-label{color:var(--text-sub);margin-top:3px;font-size:12px;line-height:1.2}.os-tabs-bar{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;grid-template-columns:repeat(3,1fr);margin-bottom:12px;display:grid;overflow:hidden}.os-tab-btn{min-height:44px;color:var(--text-sub);cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;background:0 0;border:none;justify-content:center;align-items:center;padding:0 8px;font-size:14px;font-weight:600;transition:color .15s;display:flex;position:relative}.os-tab-btn.active{color:var(--pu);font-weight:700}.os-tab-indicator{background:var(--pu);border-radius:9999px;height:2px;position:absolute;bottom:0;left:20%;right:20%}.os-tab-content{flex-direction:column;gap:12px;display:flex}.os-review-due-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;display:flex}.os-review-due-title{color:var(--text-main);margin:0;font-size:16px;font-weight:700;line-height:1.3}.os-review-due-btn{background:var(--pu);color:#fff;border-radius:var(--r-btn);cursor:pointer;white-space:nowrap;border:none;flex-shrink:0;justify-content:center;align-items:center;min-height:44px;padding:0 16px;font-size:13px;font-weight:700;text-decoration:none;transition:background-color .15s;display:inline-flex}.os-review-due-btn:hover{background:var(--puh)}.os-streak-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;padding:14px 16px}.os-card-head{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.os-card-title{color:var(--text-main);margin:0;font-size:16px;font-weight:700}.os-streak-week-row{grid-template-columns:repeat(7,1fr);gap:8px;margin-bottom:14px;display:grid}.os-day-col{flex-direction:column;align-items:center;gap:6px;display:flex}.os-day-label{color:var(--text-sub);font-size:11px;font-weight:600}.os-day-box{aspect-ratio:1;border-radius:var(--r-card);color:#fff;background:#f1f5f9;justify-content:center;align-items:center;width:100%;max-width:38px;font-size:14px;display:flex}.os-day-box.done{background:var(--pu)}.os-card-divider{background:#f1f5f9;height:1px;margin:14px 0 12px}.os-daily-goal-row{color:var(--text-main);justify-content:space-between;align-items:center;margin-bottom:8px;font-size:14px;font-weight:600;display:flex}.os-daily-goal-count{color:var(--text-sub);font-size:13px;font-weight:700}.os-goal-progress-track{background:#f1f5f9;border-radius:3px;width:100%;height:6px;overflow:hidden}.os-goal-progress-fill{background:var(--pu);border-radius:3px;height:100%;transition:width .3s}.os-trophies-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;padding:14px 16px}.os-trophies-count{color:var(--text-sub);font-size:14px;font-weight:700}.os-trophies-grid{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.os-medallion-tile{aspect-ratio:1;border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;justify-content:center;align-items:center;padding:6px;display:flex}.os-weekly-rank-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;padding:14px 16px}.os-leaderboard-list{flex-direction:column;gap:6px;display:flex}.os-lb-row{align-items:center;gap:12px;min-height:44px;padding:6px 4px;display:flex}.os-lb-row.highlight-you{background:var(--putint);border-radius:var(--r-card);padding:6px 10px}.os-lb-rank{color:var(--text-main);text-align:center;flex-shrink:0;width:22px;font-size:14px;font-weight:700}.os-lb-row.highlight-you .os-lb-rank{color:var(--pu)}.os-lb-avatar{background:#e2e8f0;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex;overflow:hidden}.os-lb-name{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;font-size:14px;font-weight:600;overflow:hidden}.os-lb-row.highlight-you .os-lb-name{color:var(--pu);font-weight:700}.os-lb-score{color:var(--text-main);text-align:right;flex-shrink:0;font-size:14px;font-weight:700}.os-lb-row.highlight-you .os-lb-score{color:var(--pu)}.os-lb-delta{color:#16a34a;align-items:center;gap:2px;margin-left:6px;font-size:12px;font-weight:700;display:inline-flex}.os-decks-list{flex-direction:column;gap:10px;display:flex}.os-deck-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;align-items:center;gap:12px;padding:12px 14px;display:flex}.os-deck-art-thumb{border-radius:var(--r-img);object-fit:cover;background:var(--bg-subtle);border:1px solid var(--bd);flex-shrink:0;width:54px;height:54px}.os-deck-info{flex:1;min-width:0}.os-deck-title{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:15px;font-weight:700;overflow:hidden}.os-deck-meta{color:var(--text-sub);margin-top:3px;font-size:12px}.os-take-test-btn{background:var(--pu);color:#fff;border-radius:var(--r-btn);cursor:pointer;white-space:nowrap;border:none;flex-shrink:0;justify-content:center;align-items:center;min-height:44px;padding:0 14px;font-size:13px;font-weight:700;text-decoration:none;transition:background-color .15s;display:inline-flex}.os-take-test-btn:hover{background:var(--puh)}.os-words-counters{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.os-word-stat-card{border:1px solid var(--bd);border-radius:var(--r-card);color:inherit;background:#fff;flex-direction:column;justify-content:center;align-items:center;min-height:44px;padding:14px 8px;text-decoration:none;transition:border-color .15s;display:flex}.os-word-stat-card:hover{border-color:var(--pu)}.os-word-stat-val{color:var(--pu);font-size:20px;font-weight:700;line-height:1.2}.os-word-stat-label{color:var(--text-sub);margin-top:4px;font-size:12px;font-weight:600}.os-words-preview-card{border:1px solid var(--bd);border-radius:var(--r-card);background:#fff;padding:14px 16px}.os-word-item-row{border-bottom:1px solid #f1f5f9;justify-content:space-between;align-items:center;padding:10px 0;display:flex}.os-word-item-row:last-child{border-bottom:none}.os-word-item-left{flex-direction:column;min-width:0;display:flex}.os-word-item-text{color:var(--text-main);font-size:15px;font-weight:700}.os-word-item-vi{color:var(--text-sub);margin-top:2px;font-size:13px}.os-word-badge{color:var(--text-sub);background:#f1f5f9;border-radius:9999px;flex-shrink:0;padding:2px 7px;font-size:11px;font-weight:700}.os-view-dict-btn{background:var(--pu);color:#fff;border-radius:var(--r-btn);cursor:pointer;border:none;justify-content:center;align-items:center;gap:6px;min-height:44px;margin-top:14px;padding:0 16px;font-size:14px;font-weight:700;text-decoration:none;transition:background-color .15s;display:flex}.os-view-dict-btn:hover{background:var(--puh)}