:root{--navy:#173b6c;--green:#16a085;--bg:#f7f9fc;--soft:#eef3fb;--mint:#eaf7f5;--text:#263238;--muted:#687783;--border:#d6dee8;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg);line-height:1.65}
.topbar{position:sticky;top:0;z-index:20;min-height:72px;background:#fff;display:flex;align-items:center;gap:28px;padding:0 6%;box-shadow:0 2px 14px #00000012}.logo{font-weight:900;font-size:22px;color:var(--navy);text-decoration:none;white-space:nowrap}.logo span{color:var(--green)}.topbar nav{display:flex;gap:18px;flex:1;align-items:center}.topbar nav a{color:#405060;text-decoration:none;font-size:14px;font-weight:700}.topbar nav a:hover{color:var(--green)}.menu-toggle{display:none;border:0;background:none;font-size:26px;margin-left:auto}
.hero{padding:62px 8%;background:linear-gradient(135deg,var(--mint),var(--soft));border-bottom:1px solid #e6edf4}.badge,.eyebrow{font-size:12px;font-weight:800;letter-spacing:1.4px;color:var(--green)}.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.12;margin:13px 0;color:var(--navy)}.hero h1 span{color:var(--green)}.hero p{max-width:820px;font-size:18px;color:#566575;margin:0}.wrap{width:min(1050px,90%);margin:38px auto 70px}.card{background:#fff;border-radius:18px;padding:28px;box-shadow:0 7px 25px #1b35510d;margin-bottom:24px}.card h2{color:var(--navy);margin-top:0}.card h3{color:var(--green)}.vocab{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.word{padding:13px 15px;background:#f5f9fc;border-left:4px solid var(--green);border-radius:8px}.dialogue{background:#eef7f5;border-radius:14px;padding:20px}.example{background:#f4f7fb;border:1px solid #e2e9f0;border-radius:12px;padding:16px;margin:10px 0}.tip{border-left:5px solid var(--navy);padding:14px 18px;background:#f0f4fa;border-radius:8px}.buttons,.pager{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}.btn{display:inline-block;border:0;border-radius:10px;padding:13px 20px;font-weight:700;text-decoration:none;cursor:pointer}.primary{background:var(--navy);color:#fff}.secondary{background:#fff;color:var(--navy);border:1px solid var(--border)}.accent{background:var(--green);color:#fff}.btn:hover{filter:brightness(.96);transform:translateY(-1px)}.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.topic{background:#fff;border-radius:16px;padding:22px;box-shadow:0 7px 25px #1b35510d;text-decoration:none;color:var(--text);border-top:4px solid var(--green)}.topic strong{display:block;color:var(--navy);font-size:18px}.topic span{color:var(--muted);font-size:14px}.question{padding:16px;background:#f7fafc;border-radius:10px;margin:12px 0}.answer-line{border-bottom:1px solid #9aa9b4;height:32px;margin-top:8px}footer{background:var(--navy);color:#dce5ee;padding:30px 8%;display:flex;justify-content:space-between;gap:20px;align-items:center}.logo-footer{font-weight:900;color:#fff;text-decoration:none}.logo-footer span{color:#5fe0c7}
@media(max-width:760px){.menu-toggle{display:block}.topbar{padding:0 5%;min-height:72px}.topbar nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;padding:20px;flex-direction:column;align-items:flex-start;box-shadow:0 10px 20px #0001}.topbar nav.open{display:flex}.hero{padding:45px 6%}.wrap{width:92%}.vocab,.topic-grid{grid-template-columns:1fr}.card{padding:20px}footer{flex-direction:column;align-items:flex-start}}
@media print{.topbar,.buttons,.pager,footer,.menu-toggle{display:none!important}body{background:#fff}.hero{padding:25px 0;background:#fff}.wrap{width:100%;margin:15px auto}.card{box-shadow:none;border:1px solid #ddd;break-inside:avoid}.hero h1{font-size:30px}}