:root{--ink:#10213a;--muted:#627089;--brand:#0c6b58;--brand2:#e7f5ef;--line:#dde4ea;--paper:#fff;--bg:#f4f7f8;--danger:#b3261e}*{box-sizing:border-box}body{color:var(--ink);background:var(--bg);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}.container{width:min(1160px,100% - 40px);margin:auto}.site-header{z-index:20;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff0;position:sticky;top:0}.nav-row{justify-content:space-between;align-items:center;height:72px;display:flex}.brand{letter-spacing:-.03em;font-size:1.35rem;font-weight:900}.site-header nav{align-items:center;gap:22px;display:flex}.link-button{cursor:pointer;color:var(--ink);background:0 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var(--line);background:#fff;border-radius:12px;padding:13px}.error{color:var(--danger);background:#fff0ef;border-radius:10px;padding:12px}.notice{background:var(--brand2);border-radius:12px;padding:16px}.empty{border:1px dashed var(--line);text-align:center;color:var(--muted);background:#fff;border-radius:18px;padding:40px}.cart-layout{grid-template-columns:1fr 340px;gap:28px;display:grid}.cart-item{border:1px solid var(--line);background:#fff;border-radius:16px;grid-template-columns:1fr auto auto;align-items:center;gap:22px;margin-bottom:14px;padding:20px;display:grid}.danger{color:var(--danger)}.summary{flex-direction:column;gap:18px;height:max-content;display:flex;position:sticky;top:94px}.summary>strong{font-size:2rem}.summary small{color:var(--muted);line-height:1.5}.order-list{gap:15px;display:grid}.order>div{justify-content:space-between;align-items:center;display:flex}.status{background:#edf0f3;border-radius:999px;padding:6px 9px;font-size:.72rem;font-weight:850}.status.paid{color:#15603e;background:#daf5e8}.status.pending_payment{color:#775700;background:#fff2c6}footer{border-top:1px solid var(--line);color:var(--muted);background:#fff;padding:28px 0}@media (max-width:850px){.site-header nav a:not(.button),.site-header nav .link-button{display:none}.hero-grid{grid-template-columns:1fr;padding:70px 0}.hero-panel{display:none}.feature-grid,.course-grid,.cart-layout,.cart-item{grid-template-columns:1fr}.summary{position:static}}.nav-row{gap:20px}.brand{letter-spacing:.025em;white-space:nowrap;flex-shrink:0;font-size:clamp(1.05rem,3.6vw,1.35rem)}.brand.image{align-items:center;height:52px;display:flex}.brand-logo{object-fit:contain;width:auto;max-width:min(240px,34vw);height:auto;max-height:48px;display:block}.lesson-row{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:24px;padding:18px 0;display:flex}.lesson-row:first-of-type{border-top:0}.lesson-row 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