.nch-home,.nch-home *{box-sizing:border-box}.nch-home{--home-ink:#17231f;--home-muted:#5f6d67;--home-line:#d9e0dc;--home-brand:#0d7a66;--home-brand-dark:#075b4c;--home-brand-soft:#dff3ec;--home-accent:#9b461f;min-height:100svh;color:var(--home-ink);background:radial-gradient(circle at 7% 0,#db75481f,#0000 24rem),radial-gradient(circle at 96% 3%,#0d7a661a,#0000 28rem),#f6f3ec;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif}:is(.nch-home a:focus-visible,.nch-home summary:focus-visible,.nch-home button:focus-visible){outline-offset:3px;outline:3px solid #1e62d0}.nch-home button{font:inherit}.nch-home__topbar{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffdb;border-bottom:1px solid #17231f1a}.nch-home__topbar-inner,.nch-home__content{width:min(100%,76rem);margin:0 auto}.nch-home__topbar-inner{justify-content:space-between;align-items:center;gap:1rem;min-height:4.75rem;padding:.75rem clamp(1rem,4vw,2rem);display:flex}.nch-home__brand{align-items:center;gap:.75rem;display:flex}.nch-home__brand-mark{color:#fff;background:var(--home-brand);border-radius:.85rem;place-items:center;width:2.6rem;height:2.6rem;font-weight:850;display:grid}.nch-home__brand p,.nch-home__brand strong{margin:0}.nch-home__brand p{color:var(--home-brand-dark);letter-spacing:.1em;font-size:.7rem;font-weight:800}.nch-home__brand strong{margin-top:.06rem;font-size:.98rem;display:block}.nch-home__mode{min-height:2.2rem;color:var(--home-brand-dark);background:var(--home-brand-soft);white-space:nowrap;border:1px solid #bddbd2;border-radius:999px;align-items:center;padding:.4rem .78rem;font-size:.76rem;font-weight:760;display:inline-flex}.nch-home__content{gap:clamp(2rem,5vw,3.5rem);padding:clamp(1.2rem,4vw,3rem) clamp(1rem,4vw,2rem) 3rem;display:grid}.nch-home__intro-panel{background:#fffffff0;border:1px solid #17231f1a;border-radius:1.5rem;grid-template-columns:minmax(0,1.35fr) minmax(18rem,.65fr);align-items:center;gap:clamp(1.25rem,4vw,3rem);padding:clamp(1.35rem,4vw,2.5rem);display:grid;box-shadow:0 20px 54px #293a3312}.nch-home__kicker{color:var(--home-accent);letter-spacing:.1em;margin:0 0 .6rem;font-size:.74rem;font-weight:850}.nch-home__intro-panel h1{letter-spacing:-.05em;max-width:13em;margin:0;font-size:clamp(2rem,5vw,3.6rem);line-height:1.08}.nch-home__intro{max-width:42rem;color:var(--home-muted);margin:1rem 0 0;font-size:.98rem;line-height:1.7}.nch-home__catalog-facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:.55rem;margin:0;display:grid}.nch-home__catalog-facts div{background:#f3f6f3;border-radius:.9rem;justify-content:space-between;align-items:center;gap:1rem;padding:.85rem 1rem;display:flex}.nch-home__catalog-facts dt{color:var(--home-muted);font-size:.76rem}.nch-home__catalog-facts dd{color:var(--home-brand-dark);margin:0;font-size:.84rem;font-weight:850}.nch-home__warning{color:#68450b;background:#fff8e8;border:1px solid #e5c88c;border-radius:.9rem;margin:-2.3rem 0 0;padding:.85rem 1rem;font-size:.86rem}.nch-home__catalog-section,.nch-home__book-stack{gap:1rem;display:grid}.nch-home__section-head{justify-content:space-between;align-items:end;gap:2rem;display:flex}.nch-home__section-head p,.nch-home__section-head h2{margin:0}.nch-home__section-head p{color:var(--home-accent);letter-spacing:.1em;font-size:.72rem;font-weight:850}.nch-home__section-head h2{letter-spacing:-.035em;margin-top:.12rem;font-size:clamp(1.55rem,3vw,2.25rem)}.nch-home__section-head>span{max-width:26rem;color:var(--home-muted);text-align:right;font-size:.84rem}.nch-home__book{background:#fffffff0;border:1px solid #17231f1c;border-radius:1.25rem;overflow:hidden;box-shadow:0 14px 38px #293a330d}.nch-home__book summary{cursor:pointer;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:.9rem;min-height:5.8rem;padding:1rem 1.15rem;list-style:none;display:grid}.nch-home__book summary::-webkit-details-marker{display:none}.nch-home__book[open] summary{border-bottom:1px solid var(--home-line)}.nch-home__book-number{color:#fff;background:var(--home-brand);border-radius:.9rem;place-items:center;width:2.8rem;height:2.8rem;font-size:1.15rem;font-weight:850;display:grid}.nch-home__book-copy h3,.nch-home__book-copy p{margin:0}.nch-home__book-copy h3{font-size:1.08rem}.nch-home__book-copy p{color:var(--home-muted);margin-top:.15rem;font-size:.78rem}.nch-home__book-meta{align-items:center;gap:.45rem;display:flex}.nch-home__book-meta span,.nch-home__book-meta strong{border-radius:999px;padding:.32rem .58rem;font-size:.7rem}.nch-home__book-meta span{color:var(--home-muted);background:#edf0ee}.nch-home__book-meta strong{color:var(--home-brand-dark);background:var(--home-brand-soft)}.nch-home__book-chevron{color:var(--home-muted);font-size:1.3rem;transition:transform .16s}.nch-home__book[open] .nch-home__book-chevron{transform:rotate(180deg)}.nch-home__lesson-catalog{grid-template-columns:repeat(5,minmax(0,1fr));gap:.55rem;padding:1rem;display:grid}.nch-home__lesson-tile{border:1px solid var(--home-line);border-radius:.85rem;flex-direction:column;justify-content:space-between;gap:.28rem;min-width:0;min-height:5.4rem;padding:.72rem;text-decoration:none;display:flex}.nch-home__lesson-tile strong{font-size:.84rem}.nch-home__lesson-tile-head{justify-content:space-between;align-items:center;gap:.35rem;min-width:0;display:flex;overflow:visible}.nch-home__lesson-complete-mark{color:#fff;background:var(--home-brand);border-radius:50%;flex:0 0 1.25rem;place-items:center;width:1.25rem;height:1.25rem;display:inline-grid;box-shadow:0 2px 6px #0d7a662e}.nch-home__lesson-complete-mark svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2.2px;width:.9rem;height:.9rem}.nch-home__lesson-tile>span:not(.nch-home__lesson-tile-head),.nch-home__lesson-tile>small{color:var(--home-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.68rem;overflow:hidden}.nch-home__lesson-tile--available{color:var(--home-brand-dark);background:#f2faf7;border-color:#a9d2c5;box-shadow:inset 0 0 0 1px #0d7a660a}.nch-home__lesson-tile--available:hover{border-color:var(--home-brand);background:var(--home-brand-soft)}.nch-home__lesson-tile--completed{background:#eaf7f2;border-color:#72b9a5;box-shadow:inset 0 0 0 1px #0d7a6614}.nch-home__lesson-tile--unavailable{color:#69726e;background:#f4f5f3}.nch-home__ai-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:.75rem;display:grid}.nch-home__ai-card{background:#fffdf7f5;border:1px solid #d8d2c3;border-radius:1.1rem;min-width:0;padding:1rem;box-shadow:0 12px 32px #4733220d}.nch-home__ai-card header{justify-content:space-between;align-items:center;gap:.6rem;display:flex}.nch-home__ai-mark{color:#fff;background:var(--home-accent);border-radius:.85rem;place-items:center;width:2.65rem;height:2.65rem;font-size:.8rem;font-weight:850;display:grid}.nch-home__status-pill{color:#6e6256;white-space:nowrap;background:#f0ebe2;border-radius:999px;padding:.3rem .52rem;font-size:.66rem;font-weight:800}.nch-home__ai-card h3,.nch-home__ai-card p{margin:0}.nch-home__ai-card h3{margin-top:.75rem;font-size:1rem}.nch-home__ai-card>strong{color:var(--home-accent);margin-top:.18rem;font-size:.7rem;display:block}.nch-home__ai-card p{color:var(--home-muted);margin-top:.48rem;font-size:.74rem;line-height:1.52}.nch-home__hsk-level{background:#263c78;font-size:.7rem}.nch-home__hsk-meta strong{color:#263c78;background:#e8ecf8}.nch-home__mock-catalog{grid-template-columns:repeat(5,minmax(0,1fr))}.nch-home__mock-tile{color:#4f596f;background:#f6f7fa;border-color:#d9deeb}.nch-home__mock-tile strong{color:#263c78}.nch-home__catalog-note{color:#68450b;background:#fff8e8;border:1px solid #e5c88c;border-radius:.95rem;align-items:baseline;gap:.8rem;padding:1rem 1.1rem;display:flex}.nch-home__catalog-note strong{flex:none;font-size:.8rem}.nch-home__catalog-note p{margin:0;font-size:.78rem;line-height:1.55}.nch-home__local-data{color:var(--home-muted);border-top:1px solid #17231f1f;justify-content:space-between;align-items:center;gap:1rem;padding:.9rem 1rem;display:flex}.nch-home__local-data strong,.nch-home__local-data p{margin:0}.nch-home__local-data strong{color:var(--home-ink);font-size:.8rem}.nch-home__local-data p,.nch-home__local-data span{margin-top:.16rem;font-size:.72rem;line-height:1.45;display:block}.nch-home__local-data span{color:var(--home-brand-dark);font-weight:700}.nch-home__local-data>button,.nch-home__data-dialog button{border:1px solid var(--home-line);min-height:2.75rem;color:var(--home-ink);cursor:pointer;background:#fff;border-radius:.65rem;padding:.55rem .9rem;font-size:.8rem;font-weight:700}.nch-home__local-data>button:hover,.nch-home__data-dialog button:not(:disabled):hover{background:#f5f7f5;border-color:#aebbb5}.nch-home__local-data>button:disabled{color:#98a29e;cursor:wait;background:#f3f5f4}.nch-home__data-overlay{z-index:100;place-items:center;padding:1rem;display:grid;position:fixed;inset:0}.nch-home__data-backdrop{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);cursor:default;background:#0a181485;border:0;width:100%;padding:0;position:absolute;inset:0}.nch-home__data-dialog{z-index:1;width:min(100% - 2rem,30rem);color:var(--home-ink);background:#fff;border:0;border-radius:1rem;padding:0;position:relative;overflow:hidden;box-shadow:0 28px 80px #17231f3d}.nch-home__data-dialog-panel>header,.nch-home__data-dialog-panel>footer{justify-content:space-between;align-items:center;gap:.75rem;padding:1rem 1.15rem;display:flex}.nch-home__data-dialog-panel>header{border-bottom:1px solid var(--home-line)}.nch-home__data-dialog-panel>header p,.nch-home__data-dialog-panel>header h2{margin:0}.nch-home__data-dialog-panel>header p{color:var(--home-muted);font-size:.68rem;font-weight:750}.nch-home__data-dialog-panel>header h2{margin-top:.08rem;font-size:1.2rem}.nch-home__data-dialog .nch-home__dialog-close{place-items:center;width:2.75rem;padding:0;display:inline-grid}.nch-home__dialog-close .control-icon{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.65px;width:1.125rem;height:1.125rem}.nch-home__data-dialog-copy{background:#f4f7f5;border-radius:.8rem;gap:.25rem;margin:1.15rem;padding:1rem;display:grid}.nch-home__data-dialog-copy strong{font-size:1rem}.nch-home__data-dialog-copy span{color:var(--home-brand-dark);font-size:.78rem;font-weight:700}.nch-home__data-dialog-copy p{color:var(--home-muted);margin:.5rem 0 0;font-size:.78rem;line-height:1.55}.nch-home__data-dialog-panel>footer{border-top:1px solid var(--home-line);background:#fafbf9;justify-content:flex-end}.nch-home__data-dialog .nch-home__danger-action{color:#922f35;background:#fff7f7;border-color:#e4b9bd}.nch-home__data-dialog .nch-home__danger-action:not(:disabled):hover{background:#fff0f1;border-color:#cc8f95}.nch-home__data-dialog button:disabled{opacity:.48;cursor:not-allowed}@media (max-width:820px){.nch-home__intro-panel{grid-template-columns:1fr}.nch-home__catalog-facts{grid-template-columns:repeat(4,minmax(0,1fr))}.nch-home__catalog-facts div{flex-direction:column;align-items:flex-start;gap:.15rem}.nch-home__lesson-catalog{grid-template-columns:repeat(4,minmax(0,1fr))}.nch-home__ai-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (max-width:560px){.nch-home__topbar-inner{min-height:4.2rem}.nch-home__brand-mark{width:2.3rem;height:2.3rem}.nch-home__brand p{font-size:.63rem}.nch-home__brand strong{font-size:.86rem}.nch-home__mode{padding-inline:.58rem;font-size:.66rem}.nch-home__content{gap:2.25rem;padding-top:1rem}.nch-home__intro-panel{border-radius:1.2rem;padding:1.2rem 1rem}.nch-home__intro-panel h1{font-size:clamp(1.85rem,9vw,2.45rem)}.nch-home__intro{margin-top:.75rem;font-size:.88rem;line-height:1.55}.nch-home__catalog-facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:.38rem}.nch-home__catalog-facts div{padding:.62rem}.nch-home__catalog-facts dt{font-size:.65rem}.nch-home__catalog-facts dd{font-size:.72rem}.nch-home__section-head{flex-direction:column;align-items:flex-start;gap:.35rem}.nch-home__section-head>span{text-align:left}.nch-home__book summary{grid-template-columns:auto minmax(0,1fr) auto;gap:.65rem}.nch-home__book-copy p{display:none}.nch-home__book-meta{grid-column:2;justify-content:flex-start}.nch-home__book-chevron{grid-area:1/3/span 2}.nch-home__lesson-catalog{grid-template-columns:repeat(3,minmax(0,1fr));gap:.42rem;padding:.65rem}.nch-home__lesson-tile{min-height:4.8rem;padding:.58rem}.nch-home__ai-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:.55rem}.nch-home__ai-card{padding:.8rem}.nch-home__ai-card p{font-size:.7rem}.nch-home__catalog-note{flex-direction:column;align-items:flex-start;gap:.28rem}.nch-home__local-data{align-items:flex-start}}@media (max-width:360px){.nch-home__lesson-catalog{grid-template-columns:repeat(2,minmax(0,1fr))}.nch-home__ai-grid{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){.nch-home *,.nch-home :before,.nch-home :after{scroll-behavior:auto!important;transition-duration:.01ms!important}}
