:root{--bg:#f4f5fb;--bg-grad-1:#eef0fb;--bg-grad-2:#f7f3fb;--surface:#fff;--surface-2:#fafbff;--text:#1c2030;--muted:#6b7180;--border:#e7e9f3;--border-strong:#d6d9ea;--primary:#6c5ce7;--primary-2:#8e7bff;--primary-ink:#4a3bcf;--primary-soft:#efeaff;--ring:#6c5ce759;--shadow-sm:0 1px 2px #1c20300f, 0 2px 8px #1c20300d;--shadow-md:0 6px 18px #1c203014, 0 2px 6px #1c20300d;--shadow-lg:0 18px 48px #4c3bcf2e, 0 6px 16px #1c203014;--radius:18px;--radius-sm:12px;--font:"Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);color:var(--text);background:radial-gradient(1200px 600px at 80% -10%, var(--bg-grad-2), transparent 60%), radial-gradient(1000px 500px at -10% 10%, var(--bg-grad-1), transparent 55%), var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility}.app{flex-direction:column;min-height:100vh;display:flex}.app-header{z-index:20;-webkit-backdrop-filter:saturate(140%)blur(12px);backdrop-filter:saturate(140%)blur(12px);border-bottom:1px solid var(--border);background:#ffffffc7;position:sticky;top:0}.app-header__inner{justify-content:space-between;align-items:center;gap:16px;max-width:1080px;margin:0 auto;padding:22px 24px;display:flex}.brand{align-items:center;gap:14px;display:flex}.brand__mark{color:#fff;background:linear-gradient(135deg, var(--primary), var(--primary-2));width:44px;height:44px;box-shadow:var(--shadow-md);border-radius:13px;place-items:center;font-size:22px;font-weight:800;display:grid}.brand__name{letter-spacing:-.02em;font-size:20px;font-weight:800}.brand__tag{color:var(--muted);margin-top:1px;font-size:13px}.header__pill{color:var(--primary-ink);background:var(--primary-soft);white-space:nowrap;border:1px solid #ddd6ff;border-radius:999px;padding:7px 13px;font-size:12px;font-weight:600}.container{width:100%;max-width:1080px;margin:0 auto;padding:0 24px}.content{flex:1;padding:40px 0 64px}.hero{text-align:center;margin-bottom:34px}.hero__title{letter-spacing:-.03em;background:linear-gradient(120deg, #2b2f44, var(--primary));color:#0000;-webkit-background-clip:text;background-clip:text;margin:0 0 10px;font-size:clamp(34px,6vw,52px);font-weight:800}.hero__sub{color:var(--muted);margin:0;font-size:16px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:30px}.tabs{justify-content:center;gap:8px;margin-bottom:30px;display:flex}.tab{appearance:none;cursor:pointer;color:var(--muted);background:var(--surface);border:0;border:1px solid var(--border);border-radius:14px;padding:13px 30px;font-family:inherit;font-size:15px;font-weight:700;transition:transform .18s,color .18s,box-shadow .18s,background .18s}.tab:hover{color:var(--text);transform:translateY(-1px)}.tab--active{color:#fff;background:linear-gradient(135deg, var(--primary), var(--primary-2));box-shadow:0 10px 24px var(--ring);border-color:#0000}.tab--active:hover{color:#fff}.seg{background:var(--surface-2);border:1px solid var(--border);border-radius:14px;gap:6px;padding:6px;display:flex}.seg__btn{appearance:none;cursor:pointer;color:var(--muted);background:0 0;border:0;border-radius:10px;flex:1;padding:11px 10px;font-family:inherit;font-size:14px;font-weight:700;transition:color .15s,background .15s,box-shadow .15s}.seg__btn:hover{color:var(--text)}.seg__btn--active{color:var(--primary-ink);background:var(--surface);box-shadow:var(--shadow-sm)}.field{margin-bottom:20px}.field__label{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px;font-size:13px;font-weight:600;display:block}.control{width:100%;color:var(--text);border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface-2);outline:none;padding:14px 16px;font-family:inherit;font-size:15px;transition:border-color .15s,box-shadow .15s,background .15s}.control::placeholder{color:#a6abc0}.control:focus{border-color:var(--primary);background:var(--surface);box-shadow:0 0 0 4px var(--ring)}select.control{appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%236b7180' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-position:right 16px center;background-repeat:no-repeat;padding-right:42px}.btn-convert{appearance:none;cursor:pointer;color:#fff;letter-spacing:.01em;border-radius:var(--radius-sm);background:linear-gradient(135deg, var(--primary), var(--primary-2));width:100%;box-shadow:0 12px 26px var(--ring);border:0;padding:16px;font-family:inherit;font-size:16px;font-weight:800;transition:transform .12s,box-shadow .18s,filter .18s}.btn-convert:hover{filter:brightness(1.04);box-shadow:0 16px 32px var(--ring)}.btn-convert:active{transform:scale(.985)}.results{margin-top:30px;animation:.35s both rise}.results__title{color:var(--text);margin:0 0 14px;font-size:15px;font-weight:700}.results__grid{grid-template-columns:repeat(2,1fr);gap:12px;display:grid}@media (min-width:640px){.results__grid{grid-template-columns:repeat(4,1fr)}}.result{background:linear-gradient(180deg, var(--surface), var(--surface-2));border:1px solid var(--border);border-radius:var(--radius-sm);text-align:center;padding:16px;transition:transform .15s,box-shadow .15s,border-color .15s}.result:hover{box-shadow:var(--shadow-md);border-color:#d9d2ff;transform:translateY(-3px)}.result__sys{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px;font-size:11px;font-weight:700}.result__size{color:var(--primary-ink);letter-spacing:-.02em;font-size:26px;font-weight:800}.divider{background:var(--border);border:0;height:1px;margin:26px 0}.stack{flex-direction:column;gap:20px;display:flex}.hint{color:var(--muted);margin-top:8px;font-size:12px;line-height:1.5}.app-footer{border-top:1px solid var(--border);background:#fff9}.app-footer__inner{text-align:center;max-width:1080px;color:var(--muted);margin:0 auto;padding:22px 24px;font-size:13px}@keyframes rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width:560px){.card{padding:22px}.app-header__inner{padding:18px}.container{padding:0 18px}.header__pill{display:none}}