:root{--bg: #05080f;--glass: rgba(255, 255, 255, .08);--glass-border: rgba(255, 255, 255, .18);--text: #e5e7eb;--muted: rgba(255, 255, 255, .6);--neon-blue: #38bdf8;--neon-purple: #a855f7;--neon-red: #ef4444;--btn-bg: rgba(255, 255, 255, .12);--btn-hover: rgba(255, 255, 255, .22);--shadow: 0 25px 60px rgba(0, 0, 0, .8)}body.light{--bg: #e5e7eb;--glass: rgba(255, 255, 255, .65);--glass-border: rgba(0, 0, 0, .1);--text: #020617;--muted: #475569;--btn-bg: rgba(255, 255, 255, .9);--btn-hover: rgba(226, 232, 240, 1);--shadow: 0 20px 40px rgba(0, 0, 0, .15)}*{margin:0;padding:0;box-sizing:border-box;font-family:Inter,system-ui,sans-serif}body{height:100vh;display:flex;justify-content:center;align-items:center;background:radial-gradient(circle at top,#1e293b,var(--bg)),linear-gradient(120deg,#0f172a,#020617);color:var(--text);transition:background .4s ease}.calculator{width:360px;padding:22px;border-radius:22px;background:linear-gradient(135deg,#ffffff26,#ffffff0d);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid var(--glass-border);box-shadow:var(--shadow);animation:fadeIn .6s ease}.calculator-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.title{font-weight:700;font-size:18px;letter-spacing:.5px}.actions button{background:none;border:none;color:var(--text);font-size:16px;cursor:pointer;padding:6px;transition:transform .2s ease}.actions button:hover{transform:scale(1.2)}.display{background:#00000059;border-radius:16px;padding:16px;margin-bottom:14px;border:1px solid var(--glass-border);box-shadow:inset 0 0 20px #0009}.previous{font-size:14px;opacity:.6;text-align:right}.current{font-size:34px;text-align:right;margin-top:6px;color:var(--neon-blue);text-shadow:0 0 12px rgba(56,189,248,.6)}.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.btn{background:var(--btn-bg);border:1px solid var(--glass-border);border-radius:14px;padding:18px;font-size:18px;color:var(--text);cursor:pointer;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);transition:all .2s ease;box-shadow:inset 0 0 #fff0,0 8px 20px #0006}.btn:hover{background:var(--btn-hover);transform:translateY(-2px)}.btn:active{transform:scale(.96)}.operator{color:var(--neon-purple);text-shadow:0 0 10px rgba(168,85,247,.7)}.equal{grid-column:span 2;background:linear-gradient(135deg,var(--neon-blue),var(--neon-purple));color:#fff;font-weight:700;box-shadow:0 0 20px #38bdf899,0 0 40px #a855f766}.equal:hover{filter:brightness(1.1)}.danger{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;box-shadow:0 0 18px #ef444499}.zero{grid-column:span 2}.scientific-panel{display:none;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:12px}.scientific-panel.active{display:grid}.scientific-panel .btn{font-size:15px;color:var(--neon-blue);text-shadow:0 0 8px rgba(56,189,248,.6)}.history{background:#00000059;border-radius:14px;padding:10px;margin-bottom:14px;border:1px solid var(--glass-border);max-height:160px;overflow-y:auto}.history-header{display:flex;justify-content:space-between;font-size:14px;margin-bottom:8px}.history-header button{background:none;border:none;color:var(--neon-blue);cursor:pointer}#historyList{list-style:none;display:flex;flex-direction:column;gap:6px}#historyList li{background:var(--btn-bg);padding:8px;border-radius:10px;font-size:14px;cursor:pointer;animation:slideUp .3s ease forwards}#historyList li:hover{background:var(--btn-hover)}@keyframes fadeIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes appEnter{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.calculator{animation:appEnter .6s cubic-bezier(.25,.8,.25,1)}#app-splash{position:fixed;inset:0;z-index:9999;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:12px;background:radial-gradient(circle at top,#1e293b,#05080f);animation:splashOut .6s ease forwards;animation-delay:1.6s}#app-splash span{font-size:20px;font-weight:600;color:#38bdf8;letter-spacing:1px;text-shadow:0 0 12px rgba(56,189,248,.7)}#app-splash{position:fixed;inset:0;z-index:9999;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:18px;background:radial-gradient(circle at top,#1e293b,#05080f)}#app-splash img{width:90px;height:90px;animation:logoPulse 1.2s ease infinite}#app-splash span{font-size:22px;font-weight:600;color:#38bdf8;letter-spacing:1px;text-shadow:0 0 12px rgba(56,189,248,.7)}.progress-container{width:180px;height:6px;border-radius:10px;background:#ffffff1a;overflow:hidden}.progress-bar{width:0%;height:100%;background:linear-gradient(90deg,#38bdf8,#22d3ee,#38bdf8);box-shadow:0 0 10px #38bdf8cc;animation:loadingBar 1.8s ease forwards}@keyframes loadingBar{to{width:100%}}@keyframes logoPulse{0%{transform:scale(1)}50%{transform:scale(1.08)}to{transform:scale(1)}}.hide-splash{animation:splashOut .6s ease forwards}@keyframes splashOut{to{opacity:0;visibility:hidden}}