:root{--qc-ink:#172c3b;--qc-muted:#516779;--qc-teal:#087f8c;--qc-coral:#de6b4a;--qc-paper:#faf9f5;--md-text-font:"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;--md-code-font:Consolas,monospace;--md-primary-fg-color:#172c3b;--md-accent-fg-color:#087f8c}
[data-md-color-scheme="default"]{--md-default-bg-color:var(--qc-paper);--md-default-fg-color:var(--qc-ink)}
[data-md-color-scheme="slate"]{--qc-paper:#16232e;--qc-ink:#e2edf2;--qc-muted:#acbec8;--qc-teal:#66d0d5;--qc-coral:#f4a086;--md-default-bg-color:var(--qc-paper)}
.md-header{box-shadow:none;border-bottom:1px solid #ffffff20}.md-tabs{background:#172c3b}.md-main__inner{margin-top:1.6rem}.md-typeset{font-size:.83rem;line-height:1.85}.md-typeset h1,.md-typeset h2,.md-typeset h3{color:var(--qc-ink);font-weight:650;letter-spacing:-.025em}.md-typeset h1{font-size:2rem;line-height:1.22}.md-typeset h2{margin-top:2rem;border-bottom:1px solid #8195a333;padding-bottom:.4rem}.md-typeset a{color:var(--qc-teal)}.md-typeset .admonition{font-size:.76rem;border-radius:8px}.md-typeset .arithmatex{overflow-x:auto;overflow-y:hidden;padding:.3rem 0}.md-nav__link{line-height:1.5}.md-typeset img{border-radius:14px}.qc-reading-bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;font-size:.64rem;letter-spacing:.06em;border-bottom:1px solid #8195a333;padding:.7rem 0;margin-bottom:1.4rem;color:var(--qc-muted)}.qc-language-switch{font-weight:650;white-space:nowrap;padding:.25rem .65rem;border:1px solid #8195a34a;border-radius:20px;letter-spacing:0}.qc-maintainer{margin-top:3rem;padding:1.2rem;border-top:2px solid var(--qc-teal);font-size:.68rem;color:var(--qc-muted)}
.qc-home{margin-top:-.7rem}.qc-eyebrow{font-family:Consolas,monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--qc-teal);font-size:.63rem;font-weight:700}.qc-home h1{font-family:Georgia,"Noto Serif SC","SimSun",serif;font-size:clamp(2.15rem,5vw,3.7rem);line-height:1.1;font-weight:500;max-width:750px;margin:.6rem 0 1.2rem}.qc-home h1 em{color:var(--qc-teal);font-style:normal}.qc-hero{display:grid;grid-template-columns:1.1fr 1fr;gap:1.6rem;align-items:center;padding:1.7rem 0 2.3rem}.qc-intro{font-size:.94rem;max-width:36rem;color:var(--qc-muted)}.qc-hero img{width:100%;border-radius:0}.qc-actions{display:flex;gap:.65rem;flex-wrap:wrap;margin-top:1.2rem}.qc-home .md-button{font-size:.7rem;border-radius:6px;padding:.65em 1.2em;border-width:1px}.qc-home .md-button--primary{background:var(--qc-teal);border-color:var(--qc-teal);color:white}.qc-statline{display:flex;gap:2rem;border-top:1px solid #8195a333;border-bottom:1px solid #8195a333;padding:1rem 0;color:var(--qc-muted);font-size:.7rem}.qc-statline strong{display:block;color:var(--qc-ink);font-size:1.25rem}.qc-section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:1rem;margin:2.4rem 0 1.1rem}.qc-section-heading h2{border:0;margin:0;font-size:1.45rem}.qc-path-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.qc-path{display:block;border:1px solid #8195a333;border-radius:12px;padding:1.1rem;background:var(--md-default-bg-color);transition:transform .2s,border-color .2s}.qc-path:hover{transform:translateY(-4px);border-color:var(--qc-teal)}.qc-path-number{color:var(--qc-coral);font-family:Consolas,monospace;font-size:.62rem;letter-spacing:.06em}.qc-path h3{margin:.35rem 0;font-size:1rem}.qc-path p{font-size:.7rem;line-height:1.65;color:var(--qc-muted);margin:.5rem 0}.qc-path span:last-child{font-size:.65rem;color:var(--qc-teal)}.qc-route{border-left:3px solid var(--qc-coral);padding:1rem 1.3rem;background:#8195a30c;margin:2rem 0}.qc-route h2{border:0;margin:0}.qc-footer-note{display:flex;justify-content:space-between;gap:2rem;padding:2rem 0 1rem;font-size:.7rem;color:var(--qc-muted);border-top:1px solid #8195a333}.qc-lesson-list{counter-reset:lesson}.qc-lesson-list li{margin-bottom:.8rem}.qc-figure-caption{font-size:.68rem;color:var(--qc-muted)}
@media(min-width:1220px){.md-grid{max-width:74rem}.md-sidebar--primary{width:12rem}.md-sidebar--secondary{width:11rem}.md-content{max-width:47rem}}
@media(max-width:760px){.qc-hero{grid-template-columns:1fr;padding-top:.8rem}.qc-hero img{max-height:260px;object-fit:contain}.qc-path-grid{grid-template-columns:1fr 1fr}.qc-statline{gap:1rem;justify-content:space-between}.qc-footer-note{flex-direction:column;gap:.6rem}.md-typeset h1{font-size:1.65rem}.qc-reading-bar{font-size:.57rem;gap:.4rem}}
@media(max-width:450px){.qc-path-grid{grid-template-columns:1fr}.qc-home h1{font-size:2.15rem}.qc-section-heading{align-items:flex-start;flex-direction:column}.qc-statline{font-size:.61rem}.qc-statline strong{font-size:1rem}}
@media(prefers-reduced-motion:reduce){.qc-path{transition:none}.qc-path:hover{transform:none}}

[data-md-color-primary="blue-grey"]{--md-primary-fg-color:#172c3b}
.md-content:has(.qc-home){max-width:none;width:100%;margin-left:auto;margin-right:auto}
.md-content__inner:has(.qc-home){max-width:1180px;margin-left:auto;margin-right:auto;padding:0 24px}
.md-main__inner:has(.qc-home){max-width:1220px}
.qc-reading-bar:has(+ .qc-home) span{font-size:0}.qc-reading-bar:has(+ .qc-home) span:after{content:"ENGLISH / 中文";font-size:.64rem}
@media(max-width:760px){.md-content__inner:has(.qc-home){padding:0}.qc-hero{gap:.8rem}}

@media(max-width:760px){.md-content__inner:has(.qc-home){padding:0 16px}}
.qc-check{border:1px solid #8195a333;border-radius:8px;padding:.55rem .8rem;margin:.5rem 0 1.2rem}.qc-check summary{cursor:pointer;font-weight:600;color:var(--qc-teal)}

.qc-language-option{display:flex;align-items:center;gap:.3rem}.qc-language-label{font-size:.65rem;color:#d8e4e9}.qc-language-select{font:inherit;font-size:.65rem;color:#eef7fa;background:#172c3b;border:1px solid #91a9b866;border-radius:6px;padding:.35rem .55rem;cursor:pointer}.qc-language-select option{background:#172c3b;color:#fff}@media(max-width:760px){.qc-language-label{display:none}.qc-language-select{max-width:98px;font-size:.6rem;padding:.25rem}.md-header__title{margin-left:.2rem;margin-right:.1rem}}