.planimetry{color:#243830;font-size:17px;line-height:1.65}
.planimetry .wrapper{display:block;max-width:1100px;padding:28px 20px 64px;box-sizing:border-box}
.planimetry h1{font-size:clamp(28px,4vw,42px);line-height:1.2;text-align:left;margin:10px 0 20px;max-width:850px}
.planimetry h2{font-size:26px;line-height:1.3;margin:0 0 22px;text-align:left}
.planimetry h3{font-size:22px;line-height:1.4;margin:0 0 18px;text-align:left}
.planimetry h4{font-size:19px;line-height:1.4;margin:0 0 10px;text-align:left}
.planimetry .pt-grade{display:block;scroll-margin-top:24px;margin-top:40px}
.planimetry .pt-grade>h2{padding:16px 0;border-top:3px solid #009966}
.planimetry .pt-grade-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:14px}
.planimetry .pt-grade-nav a{font-size:20px;font-weight:600;text-decoration:none}
.planimetry .pt-grade-nav span{display:block;font-size:14px;font-weight:400;margin-top:4px}
.planimetry .pt-formula>.math{display:block;max-width:100%;padding:4px;box-sizing:border-box}
.planimetry .pt-list-title{font:600 16px var(--t-font);color:#006b47;text-align:left;margin:18px 0 8px}
.planimetry .pt-formula .katex{font-size:1.05em}
.planimetry p{line-height:inherit;margin:0 0 12px;max-width:none}
.planimetry .pt-kicker{color:#00754e;font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
.planimetry .pt-intro{font-size:19px;max-width:850px}
.planimetry a{color:#00754e;text-decoration:underline;text-underline-offset:3px}
.planimetry .pt-toc{display:block;background:#f1f8f4;border:1px solid #d5e7dd;border-radius:10px;padding:20px 24px;margin:24px 0 32px}
.planimetry .pt-toc ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 30px;margin:10px 0 0;padding-left:22px}
.planimetry .pt-note{font-size:15px;color:#52665d}
.planimetry section{display:block;margin:0 0 36px;scroll-margin-top:24px}
.planimetry .pt-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;gap:16px}
.planimetry .pt-card{display:block;border:1px solid #dce6e0;border-radius:9px;padding:22px;background:white;min-width:0}
.planimetry ul{padding-left:21px;margin:0}
.planimetry li{margin:0 0 10px}
.planimetry li:last-child{margin-bottom:0}
.planimetry .pt-formula{background:#f1f8f4;border-left:3px solid #009966;padding:10px 14px;margin:12px 0;font-size:19px;line-height:1.65;overflow-wrap:anywhere}
.planimetry .pt-wide{grid-column:1/-1}
.planimetry figure{margin:14px auto;max-width:340px}
.planimetry svg{display:block;width:100%;height:auto}
.planimetry svg text{font:16px Georgia,serif;fill:#243830}
.planimetry figcaption{font-size:14px;color:#52665d;text-align:center}
.planimetry .pt-table-wrap{overflow:auto}
.planimetry table{border-collapse:collapse;width:100%;font-size:16px}
.planimetry th,.planimetry td{border-bottom:1px solid #dce6e0;text-align:center;padding:10px 12px}
.planimetry th{background:#f1f8f4;font-weight:600}
.planimetry th:first-child,.planimetry td:first-child{text-align:left}
.planimetry a:focus-visible,.planimetry button:focus-visible{outline:3px solid #ff9933;outline-offset:4px}
@media(max-width:700px){.planimetry .pt-grade-nav{grid-template-columns:1fr}.planimetry h3{font-size:20px}.planimetry h4{font-size:18px}}
@media(max-width:400px){.planimetry .pt-compact .katex{font-size:14px}.planimetry .pt-formula{padding:10px}.planimetry th,.planimetry td{padding:6px}}
@media(max-width:700px){.planimetry{font-size:16px}.planimetry .wrapper{padding:20px 16px 40px}.planimetry .pt-grid{grid-template-columns:1fr}.planimetry .pt-toc ol{grid-template-columns:1fr}.planimetry h2{font-size:23px}.planimetry .pt-card{padding:18px}.planimetry .pt-intro{font-size:17px}.planimetry .pt-formula{font-size:18px}.planimetry th,.planimetry td{padding:8px}}
@media print{header,footer,.breadcrumbs,.pt-tools,.pt-toc{display:none!important}.planimetry .wrapper{max-width:none;padding:0}.planimetry{font-size:10pt;line-height:1.4;color:#000}.planimetry h1{font-size:22pt}.planimetry h2{font-size:16pt;break-after:avoid}.planimetry h3{font-size:12pt}.planimetry .pt-grid{display:block;columns:2;column-gap:16px}.planimetry .pt-card{break-inside:avoid;margin-bottom:12px;padding:12px}.planimetry .pt-formula{font-size:12pt}.planimetry section{margin-bottom:18px}.planimetry a{color:#000;text-decoration:none}.planimetry figure{max-width:220px}}