:root{--qc-primary: #1d7a5f;--qc-primary-strong: #155e49;--qc-ink: #1c2422;--qc-ink-soft: #4b5a55;--qc-paper: #fafaf7;--qc-card: #ffffff;--qc-line: #e3e8e5;--qc-pro: #7c5cbf;--qc-flagship: #b3542e;--qc-radius: 12px;--qc-shadow: 0 1px 3px rgba(20, 40, 34, .08), 0 8px 24px rgba(20, 40, 34, .06)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--qc-paper);color:var(--qc-ink);font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:var(--qc-primary-strong);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;letter-spacing:.01em}h1{font-size:2.4rem}h2{font-size:1.7rem}h3{font-size:1.2rem}p{margin:0 0 1em}.qc-container{max-width:1080px;margin:0 auto;padding:0 24px}.qc-section{padding:64px 0}.qc-section--tint{background:#f1f4f1}.qc-nav{position:sticky;top:0;z-index:50;background:#fafaf7eb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--qc-line)}.qc-nav__inner{display:flex;align-items:center;gap:28px;height:60px}.qc-nav__brand{font-weight:700;color:var(--qc-ink);font-size:1.05rem}.qc-nav__brand:hover{text-decoration:none}.qc-nav__links{display:flex;gap:20px;margin-left:auto}.qc-nav__links a{color:var(--qc-ink-soft);font-weight:500}.qc-nav__links a[aria-current=page]{color:var(--qc-primary-strong);font-weight:700}.qc-footer{border-top:1px solid var(--qc-line);padding:36px 0 44px;color:var(--qc-ink-soft);font-size:.9rem}.qc-footer__inner{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between}.qc-btn{display:inline-block;padding:10px 22px;border-radius:8px;background:var(--qc-primary);color:#fff;font-weight:600;border:none;cursor:pointer;transition:background .15s}.qc-btn:hover{background:var(--qc-primary-strong);text-decoration:none;color:#fff}.qc-btn--ghost{background:transparent;color:var(--qc-primary-strong);border:1px solid var(--qc-primary)}.qc-btn--ghost:hover{background:#eef5f1;color:var(--qc-primary-strong)}.qc-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.qc-card{background:var(--qc-card);border:1px solid var(--qc-line);border-radius:var(--qc-radius);padding:22px 24px;box-shadow:var(--qc-shadow)}.qc-card h3{margin-top:0}.qc-tag{display:inline-block;font-size:.75rem;font-weight:600;padding:2px 10px;border-radius:999px;vertical-align:middle;margin-left:8px}.qc-tag--free{background:#e4f2ec;color:var(--qc-primary-strong)}.qc-tag--pro{background:#efe9f9;color:var(--qc-pro)}.qc-tag--flagship{background:#f8e9e0;color:var(--qc-flagship)}.qc-hero{padding:80px 0 56px}.qc-hero__sub{color:var(--qc-ink-soft)}.qc-stats{display:flex;flex-wrap:wrap;gap:14px 40px;margin:26px 0 0;font-weight:600}.qc-list{list-style:none;padding:0}.qc-list li{padding:10px 0;border-bottom:1px dashed var(--qc-line)}.qc-list li:before{content:"· ";color:var(--qc-primary);font-weight:800}.qc-prose{max-width:780px}.qc-prose h2{margin-top:1.6em}.qc-prose code{background:#eef2ef;padding:1px 6px;border-radius:4px;font-size:.9em}.qc-prose li{margin-bottom:.4em}.qc-404{padding:120px 24px;text-align:center}