*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:#ffffff;color:#1d1d1f;font-family:Inter,-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit}#apple_dl_root{--white:#ffffff;--black:#1d1d1f;--gray1:#f5f5f7;--gray2:#e8e8ed;--gray3:#6e6e73;--gray4:#a1a1a6;--blue:#0071e3;--blue2:#34aadc;--blue-soft:#eaf2ff;--radius-xl:28px;--radius-lg:22px;--radius-md:18px;--pill:999px;width:100%;background:var(--white);color:var(--black);padding:18px}#apple_dl_root .page{max-width:1380px;margin:0 auto;background:var(--white);border:1px solid rgba(0,0,0,.04);border-radius:32px;overflow:hidden}#apple_dl_root .nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px 34px;border-bottom:.5px solid var(--gray2);background:rgba(255,255,255,.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}#apple_dl_root 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.section_title{font-size:clamp(28px,3.8vw,42px);font-weight:700;letter-spacing:-.04em;line-height:1.06;color:var(--black);margin:0 auto 10px;max-width:780px}#apple_dl_root .section_sub{font-size:16px;font-weight:300;line-height:1.6;color:var(--gray3);max-width:650px;margin:0 auto}#apple_dl_root .bento_wrap{padding:0 22px 24px}#apple_dl_root .bento{display:grid;grid-template-columns:1fr;grid-gap:14px;gap:14px}#apple_dl_root .card-link{display:block;color:inherit;text-decoration:none}#apple_dl_root .card-link:focus-visible .card{outline:2px solid rgba(0,113,227,.22);outline-offset:4px}#apple_dl_root .card{position:relative;overflow:hidden;background:var(--gray1);border-radius:var(--radius-lg);padding:28px;min-height:250px;transition:transform .2s ease,background .18s ease}#apple_dl_root .card:hover{transform:scale(1.015);background:#ededf1}#apple_dl_root .card.black{background:#000000;color:#fff}#apple_dl_root .card.black:hover{background:#111111}#apple_dl_root .card.blue{background:var(--blue);color:#fff}#apple_dl_root .card.blue:hover{background:#0069d1}#apple_dl_root .card.wide{grid-column:auto;min-height:280px}#apple_dl_root .card_top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}#apple_dl_root .landing-card-top-tight{margin-bottom:14px}#apple_dl_root .card_num{font-size:11px;font-weight:600;letter-spacing:.09em;opacity:.48;text-transform:uppercase}#apple_dl_root .card_icon{width:38px;height:38px;border-radius:12px;background:rgba(0,0,0,.06);display:grid;place-items:center;position:relative;flex:0 0 auto}#apple_dl_root .card.black .card_icon,#apple_dl_root .card.blue .card_icon{background:rgba(255,255,255,.16)}#apple_dl_root .icon_dot:before{content:"";width:10px;height:10px;border-radius:50%;background:currentColor;opacity:.9;display:block}#apple_dl_root .icon_grid:after,#apple_dl_root 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var(--gray2);background:rgba(255,255,255,.9);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);position:-webkit-sticky;position:sticky;top:0;z-index:20}#module_topics_root .nav-back{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--blue);font-weight:500;cursor:pointer;text-decoration:none}#module_topics_root .nav-back svg{width:14px;height:14px}#module_topics_root .nav-brand{font-size:13px;font-weight:500;color:var(--black)}#module_topics_root .nav-status{font-size:12px;color:var(--gray4)}#module_topics_root .module-hero{padding:42px 32px 30px;border-bottom:.5px solid var(--gray2)}#module_topics_root .hero-shell{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);grid-gap:18px;gap:18px;align-items:start}#module_topics_root .module-badge{display:inline-flex;align-items:center;gap:6px;background:var(--blue-light);color:var(--blue);font-size:11px;font-weight:500;padding:4px 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.hero-panel{background:linear-gradient(180deg,#fbfdff,#f4f8ff);border:1px solid rgba(0,113,227,.08);border-radius:20px;padding:18px;box-shadow:var(--shadow)}#module_topics_root .hero-panel-label{font-size:10px;color:var(--gray4);letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;font-weight:600}#module_topics_root .hero-panel-title{font-size:16px;font-weight:600;letter-spacing:-.02em;margin-bottom:14px}#module_topics_root .hero-points{display:flex;flex-direction:column;gap:10px}#module_topics_root .hero-point{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border-radius:14px;background:rgba(255,255,255,.7);border:1px solid rgba(0,0,0,.04)}#module_topics_root .hero-dot{width:8px;height:8px;border-radius:50%;background:var(--blue);margin-top:5px;flex:none}#module_topics_root .hero-point strong{display:block;font-size:12px;font-weight:600;color:var(--black);margin-bottom:2px}#module_topics_root .hero-point span{font-size:12px;line-height:1.45;color:var(--gray3)}#module_topics_root .topics-section{padding:30px 32px 36px}#module_topics_root .topics-shell{max-width:1200px;margin:0 auto}#module_topics_root .section-label{font-size:11px;font-weight:500;color:var(--gray3);letter-spacing:.07em;text-transform:uppercase;margin-bottom:16px}#module_topics_root .topics-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}#module_topics_root .topic-link{display:block;color:inherit;text-decoration:none}#module_topics_root .topic-link:focus-visible .topic-card{outline:2px solid rgba(0,113,227,.22);outline-offset:4px}#module_topics_root .topic-card{background:rgba(245,245,247,.88);border-radius:var(--radius-sm);padding:22px 22px 18px;cursor:pointer;transition:transform .18s ease,background .16s ease,border-color .16s ease,box-shadow .16s ease;position:relative;display:flex;flex-direction:column;border:.5px solid transparent;min-height:188px;overflow:hidden}#module_topics_root .topic-card:hover{transform:translateY(-2px);background:#f1f4f9;border-color:#dde7f5;box-shadow:0 14px 30px rgba(0,0,0,.04)}#module_topics_root .topic-card.featured{background:#000000;color:#fff;box-shadow:0 22px 50px rgba(0,0,0,.18)}#module_topics_root .topic-card.featured:hover{background:#111111}#module_topics_root .topic-card.featured:after{content:"";position:absolute;inset:auto -40px -40px auto;width:160px;height:160px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.16),rgba(255,255,255,0) 65%);pointer-events:none}#module_topics_root .topic-card.wide{grid-column:1/3;min-height:auto}#module_topics_root .topic-card.split .topic-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;grid-gap:18px;gap:18px;align-items:start}#module_topics_root .topic-num{font-size:10px;font-weight:600;color:var(--gray4);letter-spacing:.08em;margin-bottom:10px}#module_topics_root .topic-card.featured .topic-num{color:rgba(255,255,255,.72)}#module_topics_root .topic-icon{width:34px;height:34px;border-radius:10px;background:rgba(0,0,0,.06);display:flex;align-items:center;justify-content:center;margin-bottom:14px}#module_topics_root .topic-card.featured .topic-icon{background:rgba(255,255,255,.16)}#module_topics_root .topic-icon svg{width:17px;height:17px;stroke:var(--gray3);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}#module_topics_root .topic-card.featured .topic-icon svg{stroke:#ffffff}#module_topics_root .topic-title{font-size:15px;font-weight:600;letter-spacing:-.015em;line-height:1.25;margin-bottom:6px}#module_topics_root .topic-card.featured .topic-title{color:#fff}#module_topics_root .topic-sub{font-size:12px;color:var(--gray3);line-height:1.52;max-width:34ch}#module_topics_root .topic-card.featured .topic-sub{color:rgba(255,255,255,.82)}#module_topics_root .topic-footer{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:16px}#module_topics_root .topic-tag{font-size:10px;font-weight:600;background:rgba(0,0,0,.055);color:var(--black);padding:4px 10px;border-radius:100px;letter-spacing:.01em}#module_topics_root .topic-card.featured .topic-tag{background:rgba(255,255,255,.16);color:#fff}#module_topics_root .topic-arrow{font-size:13px;color:var(--gray4);line-height:1}#module_topics_root .topic-card.featured .topic-arrow{color:rgba(255,255,255,.78)}#module_topics_root .mini-preview{display:flex;flex-direction:column;gap:10px}#module_topics_root .preview-box{border-radius:14px;padding:12px 14px;background:#ffffff;border:1px solid rgba(0,0,0,.05)}#module_topics_root .preview-label{font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--gray4);font-weight:600;margin-bottom:4px}#module_topics_root .preview-value{font-size:13px;font-weight:600;color:var(--black);letter-spacing:-.01em}#module_topics_root .preview-sub{font-size:11px;color:var(--gray3);margin-top:3px;line-height:1.45}#module_topics_root .footer-strip{display:flex;align-items:center;justify-content:center;gap:8px;padding:18px 32px 24px;border-top:.5px solid var(--gray2);font-size:12px;color:var(--gray4)}.placeholder-root{min-height:100vh;background:radial-gradient(circle at top right,rgba(0,113,227,.06),transparent 24%),linear-gradient(180deg,#ffffff 0,#fbfcff);color:#1d1d1f;padding:18px}.placeholder-page{min-height:calc(100vh - 36px);max-width:1100px;margin:0 auto;border:1px solid rgba(0,0,0,.04);border-radius:26px;overflow:hidden;background:#fff;box-shadow:0 18px 44px rgba(34,62,132,.08);display:flex;flex-direction:column}.placeholder-nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 32px;border-bottom:.5px solid #e8e8ed;background:rgba(255,255,255,.9);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.placeholder-nav a{color:#0071e3;text-decoration:none;font-size:13px;font-weight:500}.placeholder-nav-brand{font-size:13px;color:#1d1d1f;font-weight:500}.placeholder-shell{flex:1 1;display:grid;place-items:center;padding:42px 32px 54px}.placeholder-main{flex:1 1;display:flex;flex-direction:column}.placeholder-shell.has-teaching-notes{display:block;padding-bottom:16px}.placeholder-panel{width:min(720px,100%);background:linear-gradient(180deg,#fbfdff,#f4f8ff);border:1px solid rgba(0,113,227,.08);border-radius:24px;padding:30px;box-shadow:0 18px 40px rgba(0,77,163,.06)}.placeholder-badge{display:inline-flex;align-items:center;gap:6px;background:#e8f0fe;color:#0071e3;font-size:11px;font-weight:600;padding:4px 12px;border-radius:999px;margin-bottom:14px}.placeholder-title{font-size:clamp(30px,4vw,42px);font-weight:700;letter-spacing:-.03em;line-height:1.06;margin-bottom:10px}.placeholder-title span{background:linear-gradient(135deg,#0071e3,#58a6ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.placeholder-desc{font-size:15px;color:#6e6e73;line-height:1.65;margin-bottom:22px;max-width:56ch}.placeholder-meta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}.placeholder-pill{font-size:11px;font-weight:600;color:#1d1d1f;background:rgba(0,0,0,.055);padding:6px 11px;border-radius:999px}.placeholder-actions{display:flex;flex-wrap:wrap;gap:10px}.placeholder-btn-primary,.placeholder-btn-secondary{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:11px 18px;font-size:13px;font-weight:500;text-decoration:none;transition:transform .18s ease,background .18s 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