:root{--primary: #2f6f4e;--primary-dark: #1e4e34;--primary-light: #e0f2e8;--secondary: #2e6be6;--secondary-light: #e5edff;--bg: #f7f8fa;--surface: #ffffff;--text: #16181d;--text-muted: #5c6470;--divider: #e3e7e5;--danger: #c0392b;--success: #1e7a4a;--radius: 14px;--shadow: 0 8px 24px rgba(22, 24, 29, .08);--font: "Plus Jakarta Sans", "Noto Sans Bengali", system-ui, sans-serif}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}#root{min-height:100dvh}.shell{max-width:720px;margin:0 auto;padding:1rem 1.25rem 5rem}.topbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 0 1.25rem}.brand{display:flex;align-items:center;gap:.6rem;font-weight:800;letter-spacing:-.02em}.brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:grid;place-items:center;font-size:.85rem}.card{background:var(--surface);border:1px solid var(--divider);border-radius:var(--radius);padding:1.1rem 1.2rem;box-shadow:var(--shadow)}.card+.card{margin-top:.85rem}.card h2,.card h3{margin:0 0 .35rem;line-height:1.25}.muted{color:var(--text-muted);font-size:.92rem}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.65rem;margin-top:.75rem}.stat{background:var(--primary-light);border-radius:12px;padding:.75rem;text-align:center}.stat strong{display:block;font-size:1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:none;border-radius:999px;padding:.75rem 1.2rem;font-weight:700;transition:transform .15s ease,opacity .15s ease}.btn:active{transform:scale(.98)}.btn-primary{background:var(--primary);color:#fff}.btn-secondary{background:var(--secondary-light);color:var(--secondary)}.btn-block{width:100%}.bottom-nav{position:fixed;left:0;right:0;bottom:0;background:#ffffffeb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--divider);display:grid;grid-template-columns:repeat(2,1fr);padding:.5rem .75rem calc(.5rem + env(safe-area-inset-bottom))}.bottom-nav a{text-align:center;padding:.55rem;border-radius:12px;font-weight:600;font-size:.9rem;color:var(--text-muted)}.bottom-nav a.active{background:var(--primary-light);color:var(--primary-dark)}.quiz-options{display:grid;gap:.65rem;margin-top:1rem}.option{text-align:left;border:1.5px solid var(--divider);background:#fff;border-radius:12px;padding:.85rem 1rem}.option.selected{border-color:var(--secondary);background:var(--secondary-light)}.option.correct{border-color:var(--success);background:#e8f7ef}.option.wrong{border-color:var(--danger);background:#fdecea}.feedback{margin-top:1rem;padding:.85rem 1rem;border-radius:12px;background:var(--primary-light)}.error-banner{background:#fdecea;color:var(--danger);border-radius:12px;padding:.75rem 1rem;margin-bottom:1rem}.loading{text-align:center;padding:2rem 0;color:var(--text-muted)}.login-hero{min-height:70dvh;display:flex;flex-direction:column;justify-content:center;gap:1rem}.login-hero h1{font-size:clamp(1.75rem,5vw,2.25rem);margin:0;line-height:1.15}.login-hero p{margin:0;color:var(--text-muted);max-width:36ch}.landing .hero{padding:2.5rem 0 1.5rem}.landing .hero h1{font-size:clamp(1.8rem,5vw,2.5rem);margin:.75rem 0;line-height:1.15}.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.25rem}.btn-lg{padding:.85rem 1.4rem}.btn-ghost{background:transparent;color:var(--text-muted)}.topbar-actions{display:flex;gap:.5rem;align-items:center}.feature-grid{display:grid;gap:.85rem;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-top:1rem}.pill{display:inline-block;font-size:.75rem;font-weight:700;padding:.3rem .65rem;border-radius:999px;background:var(--primary-light);color:var(--primary-dark)}.auth-card{max-width:420px;margin:1rem auto 2rem}.auth-card h1{margin:0 0 .25rem;font-size:1.5rem}.form{display:grid;gap:.85rem;margin-top:1rem}.field{display:grid;gap:.35rem;font-size:.85rem;font-weight:600}.field input{padding:.7rem .85rem;border:1.5px solid var(--divider);border-radius:10px;font:inherit}.field input:focus{outline:2px solid var(--primary-light);border-color:var(--primary)}.tabs{display:flex;gap:.5rem;margin-top:1rem}.tab{flex:1;padding:.6rem;border-radius:10px;border:1.5px solid var(--divider);background:#fff;font-weight:600}.tab.active{background:var(--primary-light);border-color:var(--primary);color:var(--primary-dark)}.divider-text{text-align:center;color:var(--text-muted);font-size:.85rem;margin:1rem 0 .75rem}.center{text-align:center}.plan-row{display:flex;justify-content:space-between;align-items:center;gap:.75rem;padding:.65rem 0;border-top:1px solid var(--divider)}.plan-row strong{font-size:.95rem}