:root{color-scheme:light;--ink:#173e35;--text:#263c36;--muted:#6c7c73;--paper:#f6f7f2;--line:#dce3d9;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--text);-webkit-text-size-adjust:100%}a{color:inherit;text-decoration:none}button,summary,a{-webkit-tap-highlight-color:transparent}a:focus-visible,summary:focus-visible{outline:3px solid #d6a63c;outline-offset:6px;border-radius:8px}.skip-link{position:absolute;left:16px;top:-100px;padding:12px;background:white;z-index:10}.skip-link:focus{top:16px}.page{width:min(1120px,100% - 80px);margin:0 auto}.masthead{display:flex;align-items:center;justify-content:space-between;padding:32px 0;border-bottom:1px solid var(--line)}.wordmark{display:flex;align-items:center;gap:11px;font-weight:750;font-size:18px;letter-spacing:.04em;color:var(--ink)}.wordmark svg{width:36px;height:36px}.header-note{font-size:13px;color:var(--muted);letter-spacing:.08em}.intro{padding:65px 0 50px}.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:13px;color:#546a5d;letter-spacing:.1em}.dot{display:block;width:7px;height:7px;background:#72925e;border-radius:50%}h1{margin:17px 0 17px;font-weight:720;font-size:clamp(30px,4vw,46px);letter-spacing:-.045em;line-height:1.3;color:var(--ink)}.intro>p{font-size:16px;line-height:1.85;margin:0;color:var(--muted)}.mobile-break{display:none}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.section-heading h2{font-size:15px;font-weight:650;margin:0}.section-heading>span{font-size:12px;color:var(--muted)}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.subject-card{background:#fff;border:1px solid var(--line);border-radius:18px;display:flex;flex-direction:column;min-width:0;min-height:268px;padding:25px;transition:transform .18s,border-color .18s,box-shadow .18s}.subject-card:hover{border-color:#9db49b;transform:translateY(-3px);box-shadow:0 12px 28px #173e350b}.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:24px}.subject-symbol{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:44px;padding:0 5px;background:#eef3e9;color:#52724a;border-radius:12px;font-family:Georgia,"Times New Roman",serif;font-size:26px;font-weight:600;letter-spacing:-.06em}.card-category{font-size:11px;color:var(--muted)}.subject-card h3{font-size:19px;line-height:1.45;margin:0 0 10px;font-weight:650;letter-spacing:-.035em}.subject-card p{font-size:13px;line-height:1.85;color:var(--muted);margin:0 0 25px}.card-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:11px;gap:8px;color:#6c7c73}.card-arrow{font-size:20px;color:var(--ink)}.featured{background:var(--ink);color:white;border-color:var(--ink)}.featured .subject-symbol{background:#ffffff16;color:#deebbe;font-family:inherit;font-size:21px;letter-spacing:-.07em;padding:0 8px}.featured .card-category,.featured .card-bottom{color:#b1c9bd}.featured p{color:#c5d7cd}.featured .card-arrow{color:#e5edcb}.featured:hover{border-color:#41745d;box-shadow:0 12px 28px #173e3525}.code .subject-symbol{color:#817146;background:#f5f0e3;font-size:25px}.math .subject-symbol{color:#4b7284;background:#edf4f7;font-size:33px}.english .subject-symbol{color:#8a6b7b;background:#f5eef1;font-size:23px}.politics .subject-symbol{color:#856b4e;background:#f6f0e6;font-family:inherit;font-size:23px}.study-note{padding:25px 18px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start}.note-mark{font-size:35px;font-weight:400;color:#99aa85;line-height:1}.study-note p{font-size:23px;line-height:1.65;letter-spacing:-.04em;color:#566d55;margin:14px 0}.study-note>span:last-child{font-size:11px;line-height:1.8;color:var(--muted)}.help{margin:36px 0 0;border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line)}summary{display:flex;list-style:none;align-items:center;justify-content:space-between;gap:15px;cursor:pointer;min-height:62px;font-size:13px;padding:16px 2px}summary::-webkit-details-marker{display:none}.plus{font-size:23px;color:#82917e;line-height:1}details[open] .plus{transform:rotate(45deg)}.help-body{max-width:650px;padding:0 0 17px;font-size:13px;line-height:1.9;color:var(--muted)}.help-body ol{padding-left:22px;margin:0 0 9px}.help-body p{margin:0 0 7px}footer{display:flex;justify-content:space-between;color:#7a897e;font-size:11px;padding:25px 0 32px}
@media(max-width:900px){.page{width:calc(100% - 48px)}.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.intro{padding:50px 0 38px}.subject-card{min-height:260px}}
@media(max-width:560px){.page{width:calc(100% - 40px)}.masthead{padding:22px 0 19px}.wordmark{gap:8px;font-size:16px}.wordmark svg{width:31px;height:31px}.header-note{font-size:10px;letter-spacing:0}.intro{padding:34px 0 31px}.eyebrow{font-size:11px}h1{font-size:29px;letter-spacing:-.045em;margin:15px 0 13px}.intro>p{font-size:13px;line-height:1.85}.mobile-break{display:block}.section-heading{margin-bottom:14px}.section-heading h2{font-size:13px}.section-heading>span{font-size:10px}.subject-grid{grid-template-columns:1fr;gap:13px}.subject-card{padding:20px;min-height:210px;border-radius:15px}.card-top{margin-bottom:17px}.subject-symbol{height:37px;min-width:39px;border-radius:10px;font-size:23px}.card-category{font-size:10px}.subject-card h3{font-size:19px;margin-bottom:7px}.subject-card p{font-size:12px;line-height:1.9;margin-bottom:19px}.card-bottom{font-size:10px}.study-note{display:none}.help{margin-top:27px}summary{font-size:12px;min-height:59px}.help-body{font-size:12px}footer{font-size:10px;padding-bottom:max(28px,env(safe-area-inset-bottom))}body{padding-top:env(safe-area-inset-top);padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.subject-card{transition:none}.subject-card:hover{transform:none}}