/* V7.3.50 – Social Experience & Learning Passport. No AI, no live voice/video. */
.sn50-content{display:block;min-width:0}.sn50-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.42fr);gap:18px}.sn50-stack{display:grid;gap:16px}.sn50-card{background:var(--sn-card,#fff);border:1px solid var(--sn-line,#e5e8ec);border-radius:18px;padding:18px;min-width:0;box-shadow:0 1px 1px rgba(15,23,42,.02)}.sn50-card>header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:15px}.sn50-card h2,.sn50-card h3{margin:0;color:var(--sn-text,#172033);letter-spacing:-.02em}.sn50-card h2{font-size:18px}.sn50-card h3{font-size:15px}.sn50-card header small,.sn50-muted{color:var(--sn-muted,#748095);font-size:12px}.sn50-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.sn50-btn{border:1px solid var(--sn-line,#dfe4ea);background:var(--sn-card,#fff);color:var(--sn-text,#172033);border-radius:10px;min-height:38px;padding:8px 13px;font:600 13px/1.2 inherit;cursor:pointer}.sn50-btn:hover{border-color:var(--sn-brand,#b3262d);color:var(--sn-brand,#b3262d)}.sn50-btn.primary{background:var(--sn-brand,#b3262d);border-color:var(--sn-brand,#b3262d);color:#fff}.sn50-btn.danger{color:#b42318;border-color:#f1b7b2}.sn50-btn:disabled{opacity:.55;cursor:not-allowed}.sn50-empty{padding:44px 20px;text-align:center;border:1px dashed var(--sn-line,#dfe4ea);border-radius:16px;color:var(--sn-muted,#748095)}.sn50-empty i{display:grid;place-items:center;width:52px;height:52px;margin:0 auto 10px;border-radius:16px;background:var(--sn-soft,#f4f6f8);font:700 24px/1 "Microsoft YaHei","PingFang SC",sans-serif;color:var(--sn-brand,#b3262d)}.sn50-empty h3{margin:0 0 5px;color:var(--sn-text,#172033)}

/* Passport */
.sn50-passport-hero{position:relative;overflow:hidden;background:linear-gradient(135deg,rgba(179,38,45,.09),rgba(255,255,255,.78) 45%,rgba(14,116,144,.06));border:1px solid rgba(179,38,45,.16);border-radius:22px;padding:24px}.sn50-passport-hero:after{content:"学";position:absolute;right:24px;top:-28px;font:800 150px/1 "Microsoft YaHei","PingFang SC",sans-serif;color:rgba(179,38,45,.055);pointer-events:none}.sn50-passport-main{position:relative;z-index:1;display:flex;align-items:center;gap:17px}.sn50-passport-avatar{display:grid;place-items:center;width:76px;height:76px;border-radius:24px;background:#fff;border:1px solid rgba(179,38,45,.2);font-size:34px;box-shadow:0 8px 25px rgba(50,50,80,.08)}.sn50-passport-title{min-width:0;flex:1}.sn50-passport-title h1{font-size:26px;margin:0 0 4px}.sn50-passport-title p{margin:0;color:var(--sn-muted,#748095)}.sn50-passport-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}.sn50-pill{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:5px 9px;background:var(--sn-soft,#f3f5f7);color:var(--sn-muted,#637083);font-size:12px;font-weight:600}.sn50-pill.brand{background:rgba(179,38,45,.1);color:var(--sn-brand,#b3262d)}.sn50-stat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:18px}.sn50-stat{background:rgba(255,255,255,.78);border:1px solid rgba(100,116,139,.15);border-radius:14px;padding:12px}.sn50-stat b{display:block;font-size:20px;color:var(--sn-text,#172033)}.sn50-stat small{display:block;margin-top:2px;color:var(--sn-muted,#748095)}
.sn50-skill-list{display:grid;gap:11px}.sn50-skill{display:grid;grid-template-columns:95px minmax(0,1fr) 34px;align-items:center;gap:10px;font-size:13px}.sn50-skill>span:first-child{font-weight:600}.sn50-skill-track{height:8px;border-radius:999px;background:var(--sn-soft,#edf0f4);overflow:hidden}.sn50-skill-track i{display:block;height:100%;border-radius:inherit;background:var(--sn-brand,#b3262d)}.sn50-skill b{text-align:right;font-size:12px}.sn50-heatmap{display:grid;grid-template-columns:repeat(17,minmax(8px,1fr));gap:4px}.sn50-heat{aspect-ratio:1;border-radius:3px;background:var(--sn-soft,#edf0f4)}.sn50-heat[data-level="1"]{background:rgba(179,38,45,.18)}.sn50-heat[data-level="2"]{background:rgba(179,38,45,.36)}.sn50-heat[data-level="3"]{background:rgba(179,38,45,.58)}.sn50-heat[data-level="4"]{background:rgba(179,38,45,.82)}.sn50-week-bars{height:130px;display:grid;grid-template-columns:repeat(14,1fr);align-items:end;gap:6px}.sn50-week-bar{display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:5px;height:100%;font-size:10px;color:var(--sn-muted,#748095)}.sn50-week-bar i{display:block;width:100%;min-height:3px;border-radius:6px 6px 2px 2px;background:var(--sn-brand,#b3262d)}
.sn50-goal-list{display:grid;gap:10px}.sn50-goal{border:1px solid var(--sn-line,#e4e8ed);border-radius:14px;padding:13px}.sn50-goal-head{display:flex;justify-content:space-between;gap:10px}.sn50-goal-head strong{font-size:14px}.sn50-goal-head small{white-space:nowrap}.sn50-progress{height:8px;background:var(--sn-soft,#edf0f4);border-radius:999px;overflow:hidden;margin:10px 0 7px}.sn50-progress i{display:block;height:100%;background:var(--sn-brand,#b3262d);border-radius:inherit}.sn50-goal-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--sn-muted,#748095);font-size:11px}.sn50-milestones{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.sn50-milestone{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--sn-line,#e4e8ed);border-radius:14px;padding:12px}.sn50-milestone i{display:grid;place-items:center;flex:0 0 38px;height:38px;border-radius:12px;background:rgba(179,38,45,.1);font:700 18px/1 "Microsoft YaHei","PingFang SC",sans-serif;color:var(--sn-brand,#b3262d)}.sn50-milestone strong{display:block;font-size:13px}.sn50-milestone small{display:block;margin-top:3px;color:var(--sn-muted,#748095)}

/* Sentence Lab */
.sn50-lab-list{display:grid;gap:14px}.sn50-lab-card{display:grid;grid-template-columns:54px minmax(0,1fr) auto;gap:13px;align-items:start;background:var(--sn-card,#fff);border:1px solid var(--sn-line,#e4e8ed);border-radius:18px;padding:17px;transition:border-color .18s,transform .18s}.sn50-lab-card:hover{border-color:rgba(179,38,45,.4);transform:translateY(-1px)}.sn50-lab-avatar{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:var(--sn-soft,#f3f5f7);font-size:21px}.sn50-lab-body{min-width:0}.sn50-lab-meta{display:flex;gap:7px;align-items:center;flex-wrap:wrap;color:var(--sn-muted,#748095);font-size:11px}.sn50-lab-body h2{font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",sans-serif;font-size:21px;line-height:1.5;margin:9px 0 4px;color:var(--sn-text,#172033);overflow-wrap:anywhere}.sn50-lab-body p{margin:0;color:var(--sn-muted,#748095);font-size:13px}.sn50-lab-counts{display:grid;gap:6px;min-width:90px;text-align:right;color:var(--sn-muted,#748095);font-size:11px}.sn50-lab-counts b{font-size:14px;color:var(--sn-text,#172033)}.sn50-lab-solved{border-left:4px solid #198754}.sn50-lab-detail-head{background:var(--sn-soft,#f6f7f9);border-radius:16px;padding:17px}.sn50-lab-original{font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",sans-serif;font-size:24px;line-height:1.6;margin:8px 0;color:var(--sn-text,#172033)}.sn50-proposals{display:grid;gap:12px;margin-top:16px}.sn50-proposal{border:1px solid var(--sn-line,#e4e8ed);border-radius:16px;padding:15px}.sn50-proposal.accepted{border-color:#58a677;background:rgba(25,135,84,.055)}.sn50-proposal.verified{box-shadow:inset 3px 0 var(--sn-brand,#b3262d)}.sn50-proposal-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.sn50-proposal-author{display:flex;gap:9px;align-items:center}.sn50-proposal-author i{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:var(--sn-soft,#f3f5f7);font-style:normal}.sn50-proposal-author small{display:block;color:var(--sn-muted,#748095)}.sn50-corrected{font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",sans-serif;font-size:22px;line-height:1.55;margin:14px 0 5px}.sn50-pinyin{color:var(--sn-brand,#b3262d);font-size:13px;margin:0 0 5px}.sn50-explanation{white-space:pre-wrap;line-height:1.65;color:var(--sn-text,#172033);font-size:13px}.sn50-proposal-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;padding-top:10px;border-top:1px solid var(--sn-line,#e4e8ed)}

/* Collections */
.sn50-collections-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px}.sn50-collection-nav{display:grid;gap:7px;align-content:start}.sn50-collection-link{display:grid;grid-template-columns:38px minmax(0,1fr) auto;align-items:center;gap:9px;width:100%;border:1px solid transparent;background:transparent;border-radius:12px;padding:9px;text-align:left;color:var(--sn-text,#172033);cursor:pointer}.sn50-collection-link:hover,.sn50-collection-link.active{background:var(--sn-soft,#f3f5f7);border-color:var(--sn-line,#e4e8ed)}.sn50-collection-link>i{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:#fff;border:1px solid var(--sn-line,#e4e8ed);font-style:normal}.sn50-collection-link span{min-width:0}.sn50-collection-link strong,.sn50-collection-link small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sn50-collection-link small{color:var(--sn-muted,#748095);font-size:11px}.sn50-saved-list{display:grid;gap:10px}.sn50-saved-item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px;border:1px solid var(--sn-line,#e4e8ed);border-radius:14px;padding:14px}.sn50-saved-item h3{margin:0 0 5px;font-size:15px}.sn50-saved-item p{margin:0;color:var(--sn-muted,#748095);font-size:12px;line-height:1.5}.sn50-saved-item small{display:block;margin-top:6px;color:var(--sn-muted,#748095)}

/* Activity and settings */
.sn50-timeline{position:relative;display:grid;gap:0;padding-left:24px}.sn50-timeline:before{content:"";position:absolute;left:8px;top:12px;bottom:12px;width:2px;background:var(--sn-line,#e4e8ed)}.sn50-event{position:relative;padding:0 0 20px 16px}.sn50-event:before{content:"";position:absolute;left:-21px;top:6px;width:10px;height:10px;border:3px solid var(--sn-card,#fff);border-radius:50%;background:var(--sn-brand,#b3262d);box-shadow:0 0 0 1px var(--sn-line,#e4e8ed)}.sn50-event strong{display:block;font-size:14px}.sn50-event p{margin:4px 0;color:var(--sn-muted,#748095);font-size:12px;line-height:1.55}.sn50-event small{color:var(--sn-muted,#748095);font-size:11px}.sn50-settings{display:grid;gap:16px}.sn50-settings-section{background:var(--sn-card,#fff);border:1px solid var(--sn-line,#e4e8ed);border-radius:18px;padding:18px}.sn50-settings-section h2{font-size:17px;margin:0 0 5px}.sn50-settings-section>p{margin:0 0 16px;color:var(--sn-muted,#748095);font-size:12px}.sn50-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.sn50-field{display:grid;gap:6px}.sn50-field.full{grid-column:1/-1}.sn50-field>span{font-size:12px;font-weight:650;color:var(--sn-text,#172033)}.sn50-field input,.sn50-field select,.sn50-field textarea{width:100%;border:1px solid var(--sn-line,#dfe4ea);background:var(--sn-card,#fff);color:var(--sn-text,#172033);border-radius:11px;padding:10px 11px;font:400 14px/1.4 inherit;outline:none}.sn50-field textarea{min-height:90px;resize:vertical}.sn50-field input:focus,.sn50-field select:focus,.sn50-field textarea:focus{border-color:var(--sn-brand,#b3262d);box-shadow:0 0 0 3px rgba(179,38,45,.1)}.sn50-switch-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}.sn50-switch{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--sn-line,#edf0f2);padding:10px 0;font-size:13px}.sn50-switch input{width:38px;height:21px;accent-color:var(--sn-brand,#b3262d)}

/* Extension dialog */
.sn50-dialog{border:0;padding:0;background:transparent;max-width:min(640px,calc(100vw - 24px));width:100%}.sn50-dialog::backdrop{background:rgba(15,23,42,.46);backdrop-filter:blur(2px)}.sn50-dialog-card{background:var(--sn-card,#fff);color:var(--sn-text,#172033);border:1px solid var(--sn-line,#e4e8ed);border-radius:20px;box-shadow:0 24px 70px rgba(15,23,42,.22);overflow:hidden}.sn50-dialog-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:18px 20px;border-bottom:1px solid var(--sn-line,#e4e8ed)}.sn50-dialog-head h2{margin:2px 0 0;font-size:20px}.sn50-dialog-head small{color:var(--sn-brand,#b3262d);font-weight:700}.sn50-dialog-close{border:0;background:var(--sn-soft,#f3f5f7);width:36px;height:36px;border-radius:10px;font-size:22px;cursor:pointer}.sn50-dialog-body{padding:18px 20px;max-height:min(70vh,720px);overflow:auto}.sn50-dialog-foot{display:flex;justify-content:flex-end;gap:9px;padding:14px 20px;border-top:1px solid var(--sn-line,#e4e8ed)}

html[data-theme="dark"] .sn50-passport-hero{background:linear-gradient(135deg,rgba(216,76,82,.12),rgba(24,29,39,.85),rgba(14,116,144,.08))}html[data-theme="dark"] .sn50-stat{background:rgba(20,25,34,.72)}html[data-theme="dark"] .sn50-collection-link>i{background:var(--sn-soft,#252b35)}

@media(max-width:1100px){.sn50-grid{grid-template-columns:1fr}.sn50-stat-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.sn50-collections-layout{grid-template-columns:220px minmax(0,1fr)}}
@media(max-width:760px){.sn50-card{border-radius:14px;padding:14px}.sn50-passport-hero{border-radius:16px;padding:16px}.sn50-passport-main{align-items:flex-start}.sn50-passport-avatar{width:58px;height:58px;border-radius:17px}.sn50-passport-title h1{font-size:21px}.sn50-passport-actions{display:none}.sn50-stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sn50-stat b{font-size:17px}.sn50-milestones{grid-template-columns:1fr}.sn50-lab-card{grid-template-columns:42px minmax(0,1fr);padding:13px}.sn50-lab-avatar{width:40px;height:40px;border-radius:13px}.sn50-lab-counts{grid-column:2;display:flex;text-align:left;min-width:0}.sn50-lab-body h2{font-size:19px}.sn50-collections-layout{grid-template-columns:1fr}.sn50-collection-nav{display:flex;overflow:auto;padding-bottom:5px}.sn50-collection-link{flex:0 0 190px}.sn50-form-grid,.sn50-switch-list{grid-template-columns:1fr}.sn50-heatmap{grid-template-columns:repeat(15,minmax(8px,1fr))}.sn50-saved-item{grid-template-columns:1fr}.sn50-dialog{max-width:calc(100vw - 12px)}.sn50-dialog-card{border-radius:16px}.sn50-dialog-body{padding:14px}.sn50-corrected{font-size:20px}}
@media(max-width:390px){.sn50-stat-grid{gap:7px}.sn50-stat{padding:10px}.sn50-passport-main{gap:11px}.sn50-passport-avatar{width:50px;height:50px}.sn50-heatmap{gap:3px}.sn50-lab-card{grid-template-columns:36px minmax(0,1fr);gap:9px}.sn50-lab-avatar{width:34px;height:34px}.sn50-btn{padding:8px 10px}}