:root{--bg: #000000;--panel: #1a2038;--panel-border: #3e4a78;--text: #f2f5ff;--muted: #b8c2ea;--field-bg: #232b47;--field-border: #4e5e91;--primary-a: #6e7bff;--primary-b: #9d5cff;--secondary-bg: #2b3558;--secondary-border: #55679d;--secondary-text: #f2f5ff;--danger: #ff9db1}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);transition:background-color .2s ease,color .2s ease}body{padding:20px}.app{max-width:680px;margin:0 auto}.topbar{display:flex;gap:16px;justify-content:space-between;align-items:flex-start;margin-bottom:20px}.topbar h1{margin:0 0 8px;font-size:1.8rem}.topbar p{margin:0;color:var(--muted)}.theme-toggle{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--muted);white-space:nowrap;padding-top:10px}.theme-switch{position:relative;display:inline-flex;align-items:center;flex:0 0 auto}.panel{background:var(--panel);border:1px solid var(--panel-border);border-radius:28px;padding:22px;box-shadow:0 20px 60px #00000040}.field{display:block;margin-bottom:16px}.field span{display:block;margin-bottom:6px;font-weight:700}input,select,button{font:inherit}input:not([type=checkbox]):not([type=radio]),select{width:100%;height:52px;border-radius:18px;border:1px solid var(--field-border);background:var(--field-bg);color:var(--text);padding:0 14px}.theme-toggle input[type=checkbox]{position:absolute;top:0;right:0;bottom:0;left:0;width:52px;height:32px;margin:0;opacity:0;cursor:pointer}.theme-switch-slider{position:relative;width:52px;height:32px;border-radius:999px;background:var(--secondary-bg);border:1px solid var(--secondary-border);transition:background-color .2s ease,border-color .2s ease}.theme-switch-slider:after{content:"";position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:#fff;box-shadow:0 2px 8px #0003;transition:transform .2s ease}.theme-toggle input[type=checkbox]:checked+.theme-switch-slider{background:linear-gradient(90deg,var(--primary-a),var(--primary-b));border-color:transparent}.theme-toggle input[type=checkbox]:checked+.theme-switch-slider:after{transform:translate(20px)}.theme-toggle input[type=checkbox]:focus-visible+.theme-switch-slider{outline:2px solid var(--primary-a);outline-offset:3px}button{width:100%;height:56px;border:0;border-radius:22px;cursor:pointer;font-weight:700}button.primary{background:linear-gradient(90deg,var(--primary-a),var(--primary-b));color:#fff}button.secondary{background:var(--secondary-bg);color:var(--secondary-text);border:1px solid var(--secondary-border)}.status{min-height:24px;color:var(--danger)}.result.hidden{display:none}.result h2{margin:0 0 8px}.result p{margin:0 0 16px;color:var(--muted)}.actions{display:grid;gap:10px}html.theme-light,body.theme-light{--bg: #ffffff;--panel: #eef2ff;--panel-border: #c8d2ff;--text: #1a2240;--muted: #5d6888;--field-bg: #fbfcff;--field-border: #ccd7ff;--secondary-bg: #dde5ff;--secondary-border: #b7c6ff;--secondary-text: #33406a;--danger: #a63a52}@media (max-width: 640px){body{padding:16px}.topbar{flex-direction:column;align-items:stretch}.theme-toggle{padding-top:0;justify-content:space-between}}