:root{--navy-900:#061233;--navy-800:#0a1a44;--navy-700:#10275f;--blue-600:#1d4ed8;--blue-500:#2563eb;--yellow:#ffd60a;--yellow-600:#f5c400;--ink:#0f172a;--muted:#5b6478;--line:#e3e8f2;--bg:#f4f7fc;--white:#fff;--green:#16a34a;--red:#dc2626;--radius:16px;--shadow:0 10px 30px -12px #0a1a4440;--font:"Hind Siliguri", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-en:"Poppins", "Hind Siliguri", system-ui, sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.65}img{max-width:100%;display:block}h1,h2,h3{margin:0;line-height:1.25}p{margin:0}button{font:inherit}.container{width:100%;max-width:1120px;margin:0 auto;padding-inline:18px}.container.narrow{max-width:760px}.center{justify-content:center;margin-top:32px;display:flex}.muted{color:var(--muted);font-size:15px}.muted-light{color:#b9c5e6;font-size:15px}.btn{cursor:pointer;-webkit-tap-highlight-color:transparent;border:0;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:12px 20px;font-size:17px;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.7;cursor:wait}.btn-lg{min-height:56px;padding:15px 24px;font-size:18px}.btn-block{width:100%}.btn-primary{background:var(--yellow);color:var(--navy-900);box-shadow:0 8px 22px -8px #ffd60acc}.btn-primary:hover{background:var(--yellow-600)}.btn-ghost{color:#fff;background:#ffffff1a;border:1.5px solid #ffffff59}.btn-ghost:hover{background:#ffffff2e}.btn-outline{color:var(--navy-800);border:2px solid var(--navy-800);background:#fff}.btn-outline:hover{background:var(--navy-800);color:#fff}.link-btn{color:var(--blue-600);cursor:pointer;background:0 0;border:0;margin-top:18px;font-weight:600}.icon-btn{color:inherit;cursor:pointer;background:0 0;border:0;border-radius:10px;place-items:center;padding:6px;display:grid}.icon-btn:hover{background:#ffffff1f}:focus-visible{outline:3px solid var(--blue-500);outline-offset:2px}.topbar{background:var(--yellow);color:var(--navy-900);text-align:center;padding:8px 14px;font-size:15px;font-weight:600;line-height:1.4}.hero{color:#fff;background:radial-gradient(900px 500px at 80% 10%, #2563eb73, transparent 60%), radial-gradient(600px 400px at 0% 100%, #1d4ed859, transparent 60%), linear-gradient(180deg, var(--navy-800), var(--navy-900));padding:32px 0 44px;position:relative;overflow:hidden}.hero:before{content:"";pointer-events:none;background-image:linear-gradient(#ffffff0a 1px,#0000 1px),linear-gradient(90deg,#ffffff0a 1px,#0000 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var(--navy-900));color:#fff}.kicker{text-align:center;color:var(--blue-600);letter-spacing:.3px;font-size:15px;font-weight:700}.kicker-light{color:var(--yellow)}.section-title{text-align:center;margin:6px 0 30px;font-size:clamp(26px,5.5vw,36px);font-weight:700}.section-title.light{color:#fff}.books{gap:18px;display:grid}.book-card{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;grid-template-columns:112px 1fr;gap:16px;padding:16px;display:grid}.book-img{align-self:start;position:relative}.book-img img{border-radius:8px;width:100%;box-shadow:0 8px 18px -8px #00000073}.book-num{background:var(--yellow);width:30px;height:30px;color:var(--navy-900);border-radius:50%;place-items:center;font-size:16px;font-weight:700;display:grid;position:absolute;top:-8px;left:-8px;box-shadow:0 2px 6px #0003}.chip{color:var(--blue-600);background:#e8efff;border-radius:999px;padding:1px 10px;font-size:13px;font-weight:700;display:inline-block}.book-body 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button{width:44px;height:44px;color:var(--navy-800);cursor:pointer;background:#f1f5fd;border:0;font-size:22px;font-weight:700}.qty button:disabled{color:#b9c1d1;cursor:not-allowed}.qty output{text-align:center;min-width:44px;font-size:18px;font-weight:700}.totals{gap:8px;margin:12px 0 14px;display:grid}.totals div{justify-content:space-between;gap:12px;display:flex}.totals dt{color:var(--muted)}.totals dd{text-align:right;margin:0;font-weight:600}.totals .saving dd{color:var(--green)}.totals .grand{border-top:2px solid var(--ink);margin-top:4px;padding-top:10px}.totals .grand dt{color:var(--ink);font-size:18px;font-weight:700}.totals .grand dd{font-family:var(--font-en);color:var(--navy-800);font-size:24px;font-weight:800}.pay-note{color:#166534;background:#effaf3;border-radius:12px;align-items:center;gap:10px;margin-bottom:14px;padding:10px 12px;font-size:15px;font-weight:600;display:flex}.pay-note 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