.sbs-page{display:grid;gap:1rem;min-width:0}.sbs-hero,.sbs-control-card,.sbs-workspace,.sbs-bottom-bar{background:var(--mk-surface);border:1px solid var(--mk-line);border-radius:var(--mk-radius-lg);box-shadow:var(--mk-shadow)}.sbs-hero{display:flex;justify-content:space-between;gap:1rem;padding:1.25rem 1.35rem;align-items:flex-start}.sbs-hero h1{margin:.25rem 0 .35rem;font-size:clamp(1.7rem,3vw,2.35rem)}.sbs-hero p{margin:0;color:var(--mk-muted);max-width:850px}.section-kicker{font-size:.72rem;font-weight:900;letter-spacing:.12em;color:var(--mk-red);text-transform:uppercase}.sbs-help{flex:0 0 auto;width:34px;height:34px;border:1px solid var(--mk-line);border-radius:50%;background:var(--mk-surface-alt);color:var(--mk-ink);font-weight:900;font-size:1rem;cursor:pointer}.sbs-help:hover{border-color:var(--mk-red);color:var(--mk-red)}.sbs-control-card{display:grid;grid-template-columns:minmax(260px,1.6fr) minmax(150px,.45fr) minmax(330px,.95fr);gap:1rem;padding:1rem 1.1rem;align-items:end}.sbs-control-card label,.sbs-mode-field legend{display:block;font-size:.78rem;font-weight:800;color:var(--mk-muted);margin-bottom:.38rem}.sbs-url-row{display:flex;gap:.55rem}.sbs-url-row input,.sbs-select-field select{width:100%;min-height:42px;border:1px solid var(--mk-line);border-radius:10px;background:var(--mk-bg);color:var(--mk-ink);padding:.65rem .75rem;font:inherit}.sbs-url-row input:focus,.sbs-select-field select:focus{outline:2px solid color-mix(in srgb,var(--mk-red) 35%,transparent);border-color:var(--mk-red)}.sbs-primary{border:1px solid var(--mk-red-dark);border-radius:10px;background:var(--mk-red);color:#fff;padding:.62rem 1rem;font-weight:850;cursor:pointer;white-space:nowrap}.sbs-primary:hover{background:var(--mk-red-dark)}.sbs-field-note{font-size:.72rem;color:var(--mk-muted);margin:.35rem 0 0}.sbs-status{min-height:1.1em;margin:.3rem 0 0;font-size:.75rem;font-weight:750;color:var(--mk-success)}.sbs-status.error{color:var(--mk-red)}.sbs-mode-field{border:0;padding:0;margin:0;min-width:0}.sbs-segmented{display:grid;grid-template-columns:repeat(4,1fr);padding:3px;border:1px solid var(--mk-line);border-radius:11px;background:var(--mk-bg)}.sbs-segmented button{min-height:36px;border:0;border-radius:8px;background:transparent;color:var(--mk-ink);font:inherit;font-size:.8rem;font-weight:750;cursor:pointer}.sbs-segmented button.active{background:var(--mk-red);color:#fff;box-shadow:0 2px 8px rgba(0,0,0,.12)}.sbs-workspace{display:grid;grid-template-columns:minmax(0,1fr) 34px minmax(0,1fr);padding:.75rem;gap:.15rem;min-height:610px}.sbs-pane{display:flex;flex-direction:column;min-width:0;border:1px solid var(--mk-line);border-radius:14px;overflow:hidden;background:var(--mk-bg)}.sbs-pane-head{display:flex;justify-content:space-between;align-items:center;padding:.72rem .85rem;border-bottom:1px solid var(--mk-line);background:var(--mk-surface)}.sbs-pane-head>div{display:flex;align-items:center;gap:.45rem}.sbs-pane-head small{color:var(--mk-muted);margin-left:.15rem}.sbs-dot{width:9px;height:9px;border-radius:50%;display:inline-block}.sbs-dot.source{background:var(--mk-gold)}.sbs-dot.japanese{background:var(--mk-red)}.sbs-pane-scroll{height:540px;overflow:auto;scrollbar-gutter:stable;padding:1.05rem}.sbs-demo-site{max-width:720px;margin:0 auto;background:var(--mk-surface);border:1px solid var(--mk-line);border-radius:12px;padding:1.15rem 1.2rem;min-height:760px}.sbs-demo-brand{font-weight:950;font-size:1.12rem;color:var(--mk-success);padding-bottom:.8rem;border-bottom:1px solid var(--mk-line)}.sbs-breadcrumb{font-size:.76rem;color:var(--mk-success);margin:.8rem 0}.sbs-demo-site h2{font-size:1.65rem;margin:1rem 0}.sbs-demo-site h3{margin-top:1.8rem}.sbs-demo-site p,.sbs-demo-site li{line-height:1.85}.sbs-japanese{font-family:var(--mk-font-jp)}ruby rt{font-size:.56em;color:var(--mk-muted)}.sbs-demo-diagram{margin:2rem auto;display:flex;align-items:center;justify-content:center;gap:.8rem;min-height:120px}.sbs-demo-diagram span{display:grid;place-items:center;width:82px;height:82px;border:7px solid var(--mk-success);border-radius:50%;font-weight:900}.sbs-demo-diagram span:last-child{border-color:var(--mk-gold)}.sbs-demo-diagram b{font-size:4rem;color:var(--mk-red);line-height:1}.sbs-divider{display:grid;place-items:center;position:relative}.sbs-divider:before{content:"";width:1px;height:100%;background:var(--mk-line);position:absolute}.sbs-divider span{z-index:1;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;border:1px solid var(--mk-line);background:var(--mk-surface);color:var(--mk-red);font-weight:900}.sbs-bottom-bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 1rem}.sbs-switch{display:flex;align-items:center;gap:.55rem;cursor:pointer}.sbs-switch input{position:absolute;opacity:0;pointer-events:none}.sbs-switch span{width:42px;height:24px;border-radius:999px;background:var(--mk-surface-alt);border:1px solid var(--mk-line);position:relative;transition:.2s}.sbs-switch span:after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:var(--mk-muted);transition:.2s}.sbs-switch input:checked+span{background:color-mix(in srgb,var(--mk-success) 24%,var(--mk-surface));border-color:var(--mk-success)}.sbs-switch input:checked+span:after{left:21px;background:var(--mk-success)}.sbs-phase-note{font-size:.78rem;color:var(--mk-muted);text-align:right}.sbs-phase-note span{display:inline-block;margin-right:.5rem;padding:.18rem .45rem;border-radius:999px;background:color-mix(in srgb,var(--mk-gold) 18%,var(--mk-surface));color:var(--mk-ink);font-weight:850}.sbs-help-dialog{width:min(690px,calc(100vw - 2rem));padding:0;border:1px solid var(--mk-line);border-radius:18px;background:var(--mk-surface);color:var(--mk-ink);box-shadow:0 25px 80px rgba(0,0,0,.45)}.sbs-help-dialog::backdrop{background:rgba(8,15,25,.72)}.sbs-help-dialog form{padding:1.2rem}.sbs-help-dialog header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;padding-bottom:.8rem;border-bottom:1px solid var(--mk-line)}.sbs-help-dialog h2{margin:.2rem 0 0}.sbs-help-dialog header button{border:0;background:transparent;color:inherit;font-size:2rem;cursor:pointer}.sbs-help-copy p{line-height:1.65}.sbs-help-warning{padding:.8rem;border-radius:10px;background:color-mix(in srgb,var(--mk-red) 8%,var(--mk-surface));border:1px solid color-mix(in srgb,var(--mk-red) 30%,var(--mk-line))}
@media(max-width:1180px){.sbs-control-card{grid-template-columns:1fr 180px}.sbs-mode-field{grid-column:1/-1}.sbs-workspace{grid-template-columns:minmax(0,1fr) 28px minmax(0,1fr)}}
@media(max-width:820px){.sbs-control-card{grid-template-columns:1fr}.sbs-mode-field{grid-column:auto}.sbs-workspace{grid-template-columns:1fr;min-height:0;gap:.75rem}.sbs-divider{display:none}.sbs-pane-scroll{height:min(62vh,560px)}.sbs-bottom-bar{align-items:flex-start;flex-direction:column}.sbs-phase-note{text-align:left}.sbs-hero{padding:1rem}.sbs-control-card{padding:.9rem}.sbs-workspace{padding:.6rem}.sbs-demo-site{min-height:680px}}
@media(max-width:520px){.sbs-url-row{flex-direction:column}.sbs-segmented{grid-template-columns:repeat(2,1fr);gap:2px}.sbs-pane-scroll{padding:.65rem}.sbs-demo-site{padding:.9rem}.sbs-demo-site h2{font-size:1.35rem}}
.sbs-primary:disabled{opacity:.62;cursor:wait}.sbs-status.loading{color:var(--mk-gold)}
/* Phase 4 structured Reader View. Remote HTML is never injected directly. */
.sbs-reader-content{max-width:760px;margin:0 auto;min-height:100%;color:var(--mk-ink)}
.sbs-reader-empty{background:var(--mk-surface);border:1px dashed var(--mk-line);border-radius:12px;padding:1.2rem;color:var(--mk-muted)}
.sbs-reader-empty strong{display:block;color:var(--mk-ink);font-size:1.05rem;margin-bottom:.35rem}
.sbs-reader-article{background:var(--mk-surface);border:1px solid var(--mk-line);border-radius:12px;padding:1.15rem 1.2rem;overflow-wrap:anywhere}
.sbs-reader-meta{padding-bottom:1rem;margin-bottom:1.2rem;border-bottom:1px solid var(--mk-line)}
.sbs-reader-meta h2{margin:0 0 .35rem;font-size:1.55rem}
.sbs-reader-meta p{margin:.2rem 0;color:var(--mk-muted);font-size:.78rem}
.sbs-original-link{display:inline-flex;margin-top:.45rem;color:var(--mk-success);font-weight:850;text-decoration:none}
.sbs-original-link:hover{text-decoration:underline}
.sbs-reader-article h2,.sbs-reader-article h3,.sbs-reader-article h4,.sbs-reader-article h5,.sbs-reader-article h6{color:var(--mk-ink);line-height:1.3;margin:1.55rem 0 .65rem}
.sbs-reader-article h2{font-size:1.4rem}.sbs-reader-article h3{font-size:1.18rem}.sbs-reader-article h4{font-size:1.03rem}
.sbs-reader-article p,.sbs-reader-list-item,.sbs-reader-article blockquote{line-height:1.8;margin:.75rem 0}
.sbs-reader-list-item{position:relative;padding-left:1.25rem}
.sbs-reader-list-item:before{content:"•";position:absolute;left:.2rem;color:var(--mk-red);font-weight:900}
.sbs-reader-article blockquote{border-left:4px solid var(--mk-gold);margin-left:0;padding:.7rem 1rem;background:var(--mk-bg);border-radius:0 8px 8px 0}
.sbs-reader-article pre{overflow:auto;background:color-mix(in srgb,var(--mk-ink) 92%,#000);color:var(--mk-surface);border-radius:10px;padding:1rem;white-space:pre-wrap;word-break:break-word}
.sbs-reader-article code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.9em}
.sbs-reader-links{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.45rem}
.sbs-reader-links a{font-size:.75rem;color:var(--mk-success);text-decoration:none;border:1px solid var(--mk-line);border-radius:999px;padding:.18rem .48rem;background:var(--mk-bg)}
.sbs-reader-links a:hover{border-color:var(--mk-success);text-decoration:underline}
.sbs-reader-table-wrap{overflow:auto;margin:1rem 0;border:1px solid var(--mk-line);border-radius:10px}
.sbs-reader-table-wrap table{border-collapse:collapse;width:100%;min-width:420px;background:var(--mk-surface)}
.sbs-reader-table-wrap th,.sbs-reader-table-wrap td{border-bottom:1px solid var(--mk-line);border-right:1px solid var(--mk-line);padding:.55rem .65rem;text-align:left;vertical-align:top;font-size:.86rem}
.sbs-reader-table-wrap th{background:var(--mk-bg);font-weight:850}.sbs-reader-table-wrap tr:last-child td{border-bottom:0}
.sbs-translation-pending{text-align:left}.sbs-translation-pending>strong{font-family:var(--mk-font-jp);font-size:1.4rem;color:var(--mk-red)}
/* Phase 5 Japanese translation states. */
.sbs-segmented button:disabled{opacity:.42;cursor:not-allowed}
.sbs-japanese-article{font-family:var(--mk-font-jp)}
.sbs-translation-limit{padding:.55rem .7rem;border:1px solid color-mix(in srgb,var(--mk-gold) 45%,var(--mk-line));border-radius:8px;background:color-mix(in srgb,var(--mk-gold) 9%,var(--mk-surface));color:var(--mk-ink)!important}
.sbs-translation-skipped{padding:.55rem .7rem;border:1px dashed var(--mk-line);border-radius:8px;color:var(--mk-muted);font-style:italic;background:var(--mk-bg)}
/* Phase 6 Japanese reading modes. Furigana is built from local text/ruby nodes only. */
.sbs-japanese-article ruby{ruby-position:over;ruby-align:center;margin:0 .02em}
.sbs-japanese-article rt{font-size:.52em;line-height:1;color:var(--mk-muted);font-weight:650;letter-spacing:.01em}
.sbs-japanese-article [lang="ja-Latn"]{font-family:var(--mk-font-ui);letter-spacing:.01em}
.sbs-segmented button.active{box-shadow:inset 0 -2px 0 color-mix(in srgb,var(--mk-red) 72%,transparent)}
/* Phase 7 block-anchored synchronized scrolling. */
.sbs-pane-scroll[data-sbs-pane]{scroll-behavior:auto}
.sbs-reader-article [data-source-block-id]{scroll-margin-top:72px}
/* Phase 8 mobile/foldable refinement. */
.sbs-pane-actions{display:flex;align-items:center;gap:.45rem}
.sbs-mobile-jump{display:none;border:1px solid var(--mk-line);background:var(--mk-surface-alt);color:var(--mk-ink);border-radius:999px;padding:.28rem .55rem;font:inherit;font-size:.72rem;font-weight:850;cursor:pointer}
.sbs-mobile-jump:hover,.sbs-mobile-jump:focus-visible{border-color:var(--mk-red);outline:none;box-shadow:0 0 0 2px color-mix(in srgb,var(--mk-red) 18%,transparent)}
.sbs-layout-badge{display:inline-block;margin-right:.5rem;padding:.18rem .45rem;border-radius:999px;border:1px solid var(--mk-line);background:var(--mk-surface-alt);color:var(--mk-ink);font-size:.72rem}
@media(max-width:820px){
  .sbs-mobile-jump{display:inline-flex;align-items:center;justify-content:center}
  .sbs-pane{scroll-margin-top:12px}
  .sbs-pane-head{position:sticky;top:0;z-index:3;background:var(--mk-surface)}
  .sbs-pane-scroll{overscroll-behavior:contain}
}
/* Phase 9 Reader Experience. */
.sbs-reader-tools{display:flex;align-items:center;gap:.65rem;flex-wrap:wrap}.sbs-text-tools{display:inline-flex;align-items:center;border:1px solid var(--mk-line);border-radius:999px;overflow:hidden;background:var(--mk-bg)}.sbs-text-tools button{border:0;background:transparent;color:var(--mk-ink);padding:.34rem .55rem;font:inherit;font-weight:850;cursor:pointer}.sbs-text-tools output{min-width:48px;text-align:center;font-size:.72rem;color:var(--mk-muted)}.sbs-tool-button{display:inline-flex;align-items:center;justify-content:center;min-height:34px;border:1px solid var(--mk-line);border-radius:999px;background:var(--mk-surface-alt);color:var(--mk-ink);padding:.35rem .65rem;font:inherit;font-size:.74rem;font-weight:850;text-decoration:none;cursor:pointer}.sbs-tool-button:hover{border-color:var(--mk-red);color:var(--mk-red)}.sbs-reader-content{font-size:var(--sbs-reader-scale,1rem)}.sbs-reader-article p,.sbs-reader-list-item,.sbs-reader-article blockquote{line-height:var(--sbs-reader-line-height,1.8)}.sbs-reader-article [data-source-block-id]{transition:background-color .16s ease,box-shadow .16s ease;border-radius:6px}.sbs-reader-article [data-source-block-id].sbs-counterpart-active{background:color-mix(in srgb,var(--mk-gold) 18%,transparent);box-shadow:0 0 0 2px color-mix(in srgb,var(--mk-gold) 40%,transparent)}
@media(max-width:820px){.sbs-reader-tools{width:100%}.sbs-phase-note{width:100%}}
/* Phase 10 Learning Integration. */
.sbs-learning-panel{margin-top:1rem;padding:1rem;border:1px solid var(--mk-line);border-radius:16px;background:var(--mk-surface);box-shadow:var(--mk-shadow)}
.sbs-learning-panel[hidden]{display:none}.sbs-learning-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem}.sbs-learning-head h2{margin:.2rem 0 .65rem}.sbs-learning-close{border:1px solid var(--mk-line);background:var(--mk-surface-alt);color:var(--mk-ink);border-radius:999px;width:34px;height:34px;font-size:1.2rem;cursor:pointer}
.sbs-learning-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem}.sbs-learning-copy{padding:.7rem;border:1px solid var(--mk-line);border-radius:10px;background:var(--mk-bg);min-width:0}.sbs-learning-copy small{display:block;color:var(--mk-muted);font-weight:800;margin-bottom:.25rem}.sbs-learning-copy strong,.sbs-learning-copy span{display:block;overflow-wrap:anywhere}
.sbs-grammar-cues{margin-top:.7rem;padding:.65rem .75rem;border-left:3px solid var(--mk-gold);background:color-mix(in srgb,var(--mk-gold) 7%,var(--mk-surface));border-radius:8px}.sbs-grammar-cues b{margin-right:.5rem}.sbs-learning-actions{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.8rem}.sbs-learning-actions button,.sbs-learning-actions a{border:1px solid var(--mk-line);border-radius:999px;background:var(--mk-surface-alt);color:var(--mk-ink);padding:.42rem .68rem;font:inherit;font-size:.76rem;font-weight:850;text-decoration:none;cursor:pointer}.sbs-learning-actions button:hover,.sbs-learning-actions a:hover{border-color:var(--mk-red);color:var(--mk-red)}.sbs-learning-note{margin:.7rem 0 0;color:var(--mk-muted);font-size:.78rem}
@media(max-width:820px){.sbs-learning-grid{grid-template-columns:1fr}.sbs-learning-actions>*{flex:1 1 auto;text-align:center}}

/* Phase 11 Beta UX patch: long-running reader progress feedback. */
.sbs-load-progress{margin-top:.5rem;padding:.65rem .75rem;border:1px solid var(--mk-line);border-radius:10px;background:color-mix(in srgb,var(--mk-gold) 7%,var(--mk-surface));}
.sbs-load-progress[hidden]{display:none!important}.sbs-load-progress-head{display:flex;justify-content:space-between;gap:1rem;align-items:center;font-size:.76rem;color:var(--mk-ink)}
.sbs-load-progress-head strong{font-weight:850}.sbs-load-progress-head span{font-variant-numeric:tabular-nums;color:var(--mk-muted);font-weight:800}
.sbs-load-progress progress{display:block;width:100%;height:10px;margin:.45rem 0 .38rem;border:0;border-radius:999px;overflow:hidden;background:var(--mk-surface-alt);accent-color:var(--mk-red)}
.sbs-load-progress progress::-webkit-progress-bar{background:var(--mk-surface-alt);border-radius:999px}.sbs-load-progress progress::-webkit-progress-value{background:linear-gradient(90deg,var(--mk-gold),var(--mk-red));border-radius:999px;transition:width .45s ease}.sbs-load-progress progress::-moz-progress-bar{background:var(--mk-red);border-radius:999px}
.sbs-load-progress p{margin:0;font-size:.71rem;line-height:1.35;color:var(--mk-muted)}
.sbs-load-progress.is-waiting progress{animation:sbs-progress-pulse 1.4s ease-in-out infinite}
@keyframes sbs-progress-pulse{0%,100%{filter:brightness(1)}50%{filter:brightness(1.18)}}
@media(prefers-reduced-motion:reduce){.sbs-load-progress.is-waiting progress{animation:none}.sbs-load-progress progress::-webkit-progress-value{transition:none}}