:root{--red: #C0392B;--red-light: #FDECEA;--red-mid: #E8746A;--ink: #1A1A1A;--ink-2: #444;--ink-3: #888;--paper: #FAFAF8;--paper-2: #F2F1ED;--paper-3: #E8E6DF;--white: #FFFFFF;--green: #1D7A55;--green-light: #E3F4EC;--serif: "Noto Serif SC", serif;--sans: "Noto Sans SC", sans-serif;--mono: "DM Mono", monospace;--radius: 10px;--radius-sm: 6px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--sans);background:var(--paper);color:var(--ink);font-size:15px;line-height:1.7;min-height:100vh;display:flex;flex-direction:column}nav{position:sticky;top:0;z-index:100;background:#fafaf8eb;backdrop-filter:blur(12px);border-bottom:1px solid var(--paper-3);padding:0 40px;display:flex;align-items:center;justify-content:space-between;height:58px}.logo{font-family:var(--serif);font-size:20px;font-weight:600;color:var(--ink);letter-spacing:.03em;display:flex;align-items:center;gap:8px;text-decoration:none}.logo-dot{width:8px;height:8px;background:var(--red);border-radius:50%;display:inline-block}.nav-links{display:flex;gap:28px}.nav-links a{font-size:13px;color:var(--ink-2);text-decoration:none;letter-spacing:.02em;transition:color .15s}.nav-links a:hover,.nav-links a.active{color:var(--red)}.nav-right{display:flex;align-items:center;gap:14px}.lang-switcher{display:flex;align-items:center;gap:4px;border:1px solid var(--paper-3);border-radius:999px;padding:3px 10px;background:transparent}.lang-opt{font-size:11px;font-family:var(--mono);background:none;border:none;color:var(--ink-3);cursor:pointer;padding:1px 4px;border-radius:4px;transition:all .15s;text-decoration:none}.lang-opt:hover{color:var(--ink)}.lang-opt.active{color:var(--ink);background:var(--paper-2);font-weight:500}.lang-sep{font-size:10px;color:var(--paper-3)}.submit-nav-btn{background:var(--ink);color:#fff;border:none;padding:7px 14px;border-radius:var(--radius-sm);font-size:12px;font-family:var(--sans);cursor:pointer;transition:background .15s}.submit-nav-btn:hover{background:var(--red);color:#fff}.nav-toggle{display:none;width:36px;height:36px;padding:0;background:transparent;border:1px solid var(--paper-3);border-radius:8px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:4px}.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--ink-2);transition:transform .2s,opacity .2s}nav.open .nav-toggle span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}nav.open .nav-toggle span:nth-child(2){opacity:0}nav.open .nav-toggle span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}.en-only{display:none}.zh-only,body.lang-en .en-only{display:block}body.lang-en .zh-only{display:none}.page-hero{background:var(--ink);color:#fff;padding:52px 40px 48px;text-align:center}.page-hero .eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--red-mid);text-transform:uppercase;margin-bottom:16px;display:flex;align-items:center;justify-content:center;gap:8px}.page-hero .eyebrow:before,.page-hero .eyebrow:after{content:"";display:block;width:20px;height:1px;background:var(--red-mid)}.page-hero h1{font-family:var(--serif);font-size:34px;font-weight:300;line-height:1.35;margin-bottom:12px}.page-hero h1 em{font-style:normal;color:var(--red-mid)}.page-hero p{font-size:14px;color:#ffffff8c;max-width:560px;margin:0 auto;line-height:1.8}.page-main{flex:1;max-width:980px;margin:0 auto;width:100%;padding:48px 40px}.rules-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px}.rule-card{background:var(--white);border:1px solid var(--paper-3);border-radius:var(--radius);padding:22px 22px 20px;position:relative;transition:border-color .15s,transform .15s}.rule-card:hover{border-color:var(--ink);transform:translateY(-2px)}.rule-card-head{display:flex;align-items:flex-start;gap:12px;margin-bottom:12px}.rule-icon{width:36px;height:36px;border-radius:var(--radius-sm);background:var(--paper-2);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.rule-title{font-family:var(--serif);font-size:17px;font-weight:500;color:var(--ink);line-height:1.4}.rule-title-en{font-size:11px;font-family:var(--mono);color:var(--ink-3);letter-spacing:.04em;margin-top:3px}.rule-summary{font-size:13px;color:var(--ink-2);line-height:1.75;margin-bottom:12px}.rule-points{list-style:none;display:flex;flex-direction:column;gap:6px;margin-bottom:12px}.rule-points li{font-size:12.5px;color:var(--ink-2);padding-left:14px;position:relative;line-height:1.7}.rule-points li:before{content:"·";position:absolute;left:4px;color:var(--red-mid);font-weight:700}.rule-points li.tip{background:var(--red-light);color:var(--red);font-weight:500;padding:8px 12px 8px 22px;border-radius:6px;margin:0 -2px 4px}.rule-points li.tip:before{content:"⭐";left:6px;font-size:11px;top:8px}.rule-tip{font-size:11.5px;color:var(--ink-3);background:var(--paper-2);padding:9px 12px;border-radius:var(--radius-sm);border-left:2px solid var(--red-mid);line-height:1.7}.about-body{max-width:680px;margin:0 auto}.about-body h2{font-family:var(--serif);font-size:22px;font-weight:500;color:var(--ink);margin:36px 0 14px;letter-spacing:.01em}.about-body h2:first-child{margin-top:0}.about-body p{font-size:14.5px;color:var(--ink-2);line-height:1.9;margin-bottom:14px}.about-body a{color:var(--red);text-decoration:none;border-bottom:1px solid rgba(192,57,43,.3)}.about-body a:hover{border-bottom-color:var(--red)}.about-body ul{list-style:none;padding-left:0;margin:10px 0 18px}.about-body ul li{font-size:14px;color:var(--ink-2);padding:8px 0 8px 18px;position:relative;border-bottom:1px dashed var(--paper-3)}.about-body ul li:last-child{border-bottom:none}.about-body ul li:before{content:"▸";position:absolute;left:0;color:var(--red-mid);font-size:11px;top:11px}.about-cta{margin-top:36px;padding:24px;background:var(--ink);color:#fff;border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;gap:20px}.about-cta .cta-text{font-size:14px;line-height:1.7}.about-cta .cta-text strong{font-weight:500;color:var(--red-mid)}.about-cta a{background:var(--white);color:var(--ink);padding:10px 18px;border-radius:var(--radius-sm);font-size:13px;text-decoration:none;white-space:nowrap;transition:all .15s}.about-cta a:hover{background:var(--red);color:#fff}footer{background:var(--paper-2);border-top:1px solid var(--paper-3);padding:24px 40px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--ink-3);font-family:var(--mono)}footer a{color:var(--ink-3);text-decoration:none}footer a:hover{color:var(--ink)}@media(max-width:768px){nav{padding:0 16px;gap:10px;position:relative}.nav-toggle{display:flex}.submit-nav-btn{display:none}.nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;padding:8px 16px 16px;background:#fafaf8fa;backdrop-filter:blur(12px);border-bottom:1px solid var(--paper-3);font-size:15px}.nav-links a{padding:12px 0;border-bottom:1px solid var(--paper-2)}.nav-links a:last-child{border-bottom:none}nav.open .nav-links{display:flex}.page-hero{padding:40px 20px 36px}.page-hero h1{font-size:26px}.page-main{padding:32px 20px}.rules-grid{grid-template-columns:1fr;gap:14px}.about-cta{flex-direction:column;align-items:flex-start}footer{flex-direction:column;gap:10px;text-align:center}}