*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-page);color:var(--text-primary);line-height:1.5;min-height:100dvh}:root{--navy: #1A3C5E;--blue: #2E86C1;--blue-light: #D6EAF8;--tier-found: #1E8449;--tier-inter: #E07B20;--tier-adv: #C0392B;--bg-page: #F4F6F7;--bg-card: #FFFFFF;--bg-subtle: #F4F6F7;--bg-input: #FFFFFF;--text-primary: #1A1A1A;--text-secondary: #555555;--text-muted: #888888;--text-inverse: #FFFFFF;--border: #D5D8DC;--border-focus: #2E86C1;--green: #1E8449;--green-bg: #D5F5E3;--orange: #CA6F1E;--orange-bg: #FDEBD0;--red: #C0392B;--red-bg: #FADBD8;--purple: #6C3483;--purple-bg: #E8DAEF;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(0,0,0,.08);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--max-width: 480px;--nav-height: 60px;--header-height: 56px}h1{font-size:1.5rem;font-weight:700;line-height:1.2;color:var(--navy)}h2{font-size:1.2rem;font-weight:600;line-height:1.3}h3{font-size:1rem;font-weight:600}p{color:var(--text-secondary)}.page{max-width:var(--max-width);margin:0 auto;padding:var(--space-4);padding-bottom:calc(var(--nav-height) + var(--space-6));min-height:100dvh}.page-no-nav{max-width:var(--max-width);margin:0 auto;padding:var(--space-4);min-height:100dvh}.card{background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);padding:var(--space-4)}.card-subtle{background:var(--bg-subtle);border-radius:var(--radius-lg);padding:var(--space-4)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:12px 20px;border-radius:var(--radius-md);font-size:.9375rem;font-weight:600;cursor:pointer;border:none;transition:opacity .15s,transform .1s;font-family:inherit;text-decoration:none;white-space:nowrap}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.45;pointer-events:none}.btn-primary{background:var(--navy);color:var(--text-inverse)}.btn-primary:hover{opacity:.88}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-subtle)}.btn-brand{background:linear-gradient(135deg,#1a3c5e,#2e86c1);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.btn-brand:hover{opacity:.92}.btn-full{width:100%}.btn-sm{padding:8px 14px;font-size:.875rem}.btn-lg{padding:16px 28px;font-size:1.0625rem}.input{width:100%;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;background:var(--bg-input);color:var(--text-primary);transition:border-color .15s;outline:none}.input:focus{border-color:var(--border-focus)}.input::placeholder{color:var(--text-muted)}.label{display:block;font-size:.875rem;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.form-group{margin-bottom:var(--space-4)}.input-error{border-color:var(--red)!important}.error-msg{color:var(--red);font-size:.8125rem;margin-top:4px}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600}.badge-found{background:var(--green-bg);color:var(--tier-found)}.badge-inter{background:var(--orange-bg);color:var(--tier-inter)}.badge-adv{background:var(--red-bg);color:var(--tier-adv)}.badge-burn{background:var(--orange-bg);color:var(--orange)}.badge-learn{background:var(--blue-light);color:var(--navy)}.badge-earn{background:var(--green-bg);color:var(--green)}.avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9375rem;flex-shrink:0}.progress-track{width:100%;height:8px;background:var(--bg-subtle);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;border-radius:var(--radius-full);background:linear-gradient(90deg,var(--blue) 0%,var(--navy) 100%);transition:width .4s ease}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:var(--nav-height);background:var(--bg-card);border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-around;padding:0 var(--space-2);z-index:100;max-width:var(--max-width);margin:0 auto}.nav-item{display:flex;flex-direction:column;align-items:center;gap:3px;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);cursor:pointer;border:none;background:none;font-family:inherit;transition:background .15s;flex:1;text-decoration:none;color:var(--text-muted)}.nav-item.active{color:var(--navy)}.nav-item:hover{background:var(--bg-subtle)}.nav-icon{font-size:1.375rem;line-height:1}.nav-label{font-size:.6875rem;font-weight:600}.divider{height:1px;background:var(--border);margin:var(--space-4) 0}.spinner{width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--navy);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-center{display:flex;align-items:center;justify-content:center;min-height:60vh}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease forwards}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.12)}to{transform:scale(1)}}.pop{animation:pop .3s ease}