.landing{max-width:1000px;margin:auto;padding:0 28px}.site-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 0;border-bottom:1px solid var(--border)}.site-brand{display:inline-flex;align-items:center;color:var(--text);font-size:23px;font-weight:750;letter-spacing:-.7px}.site-brand:hover{text-decoration:none}.site-brand>span:not(.brand-bot):not(.brand-dot){font-weight:450}.brand-bot{width:36px;height:36px;margin-right:8px;color:var(--accent)}.brand-bot svg{width:100%;height:100%}.brand-dot{color:var(--accent)}.site-header nav{display:flex;flex-wrap:wrap;gap:20px}.site-header nav a{display:inline-flex;align-items:center;min-height:44px;color:var(--text-dim);font-size:15px}.site-header nav a[aria-current]{color:var(--accent)}.welcome{padding:36px 0 32px}.welcome h1{font-size:clamp(30px,4vw,40px);line-height:1.2;margin:0 0 10px;letter-spacing:-1px}.welcome p{margin:0 0 20px;color:var(--text-dim)}.landing .btn,.landing .btn.primary{border-radius:10px;box-shadow:none}.game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.activity-card{min-width:0;padding:22px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px}.game-symbol{display:block;font-size:28px;height:42px}.activity-card h2{font-size:20px;margin:8px 0}.activity-card p{color:var(--text-dim);font-size:15px;line-height:1.5;min-height:46px;margin:0 0 12px}.activity-links{display:flex;gap:20px;flex-wrap:wrap}.activity-links a{display:inline-flex;align-items:center;min-height:44px;font-size:15px;font-weight:650}.activity-links a+a{color:var(--text-dim)}.site-footer{display:flex;flex-wrap:wrap;gap:28px;margin-top:36px;padding:18px 0;border-top:1px solid var(--border)}.site-footer a{padding:8px 0;color:var(--text-dim);font-size:14px}.explanation{max-width:700px;padding:32px 0;margin:auto}.explanation .eyebrow{display:none}.explanation h1{font-size:clamp(28px,4vw,36px);line-height:1.25}.explanation-lead{color:var(--text-dim)}.explanation-steps{list-style:none;padding:0;display:grid;gap:16px;margin:24px 0}.explanation-steps li{padding:18px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px}.explanation-steps p,.discovery-note p{margin-bottom:0}.discovery-note{border-left:3px solid var(--accent);padding:4px 18px}.explanation details{margin:24px 0}.explanation summary{cursor:pointer;padding:12px 0;font-weight:650}@media(max-width:760px){.site-header{align-items:flex-start;flex-direction:column;gap:8px}.game-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:500px){.landing{padding-inline:18px}.site-header nav{gap:14px}.site-header nav a{font-size:14px}.welcome{padding-block:26px}.game-grid{grid-template-columns:1fr;gap:12px}.activity-card{padding:18px}.game-symbol{float:right;margin-left:12px}.activity-card h2{margin-top:0}.activity-card p{min-height:0}}