:root{--bg-color: #fafafa;--container-bg: #333;--display-bg: #a7af7c;--button-bg: linear-gradient(180deg, #2f2f2f, #3f3f3f);--button-before-bg: linear-gradient(90deg, #2d2d2d, #4d4d4d);--text-color: #fff;--shadow-color: rgba(0, 0, 0, .25);--button-border: rgba(0, 0, 0, .75);--button-glow: rgba(0, 0, 0, .4);--transition: all .3s cubic-bezier(.4, 0, .2, 1);--glow-effect: 0 0 15px rgba(33, 150, 243, .4)}[data-theme=light]{--bg-color: #f0f2f5;--container-bg: rgba(255, 255, 255, .8);--btn-bg: rgba(255, 255, 255, .9);--btn-shadow: 0 4px 6px rgba(0, 0, 0, .05), inset 0 1px 0 rgba(255, 255, 255, .8);--btn-hover: #ffffff;--text-color: #333;--display-bg: #e1e4e8;--display-text: #2c3e50;--primary-btn: #3498db;--secondary-btn: #e74c3c;--glow: 0 0 15px rgba(52, 152, 219, .3);--transition: all .3s cubic-bezier(.4, 0, .2, 1)}@font-face{font-family:digital-7;src:url(/assets/fonts/digital-7.ttf);font-style:normal}*{margin:0;padding:0;box-sizing:border-box;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;transition:background-color .3s ease,color .3s ease,transform .1s ease}body{background-color:var(--bg-color);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;font-family:Arial,Helvetica,sans-serif}.controls{margin-bottom:20px;display:flex;gap:15px}.toggle-btn{padding:8px 16px;border-radius:20px;border:none;background:var(--container-bg);color:var(--text-color);cursor:pointer;box-shadow:0 4px 6px var(--shadow-color);font-weight:700;transition:all .3s ease}.container{background-color:var(--container-bg);padding:40px 20px 30px 30px;border-radius:20px;min-width:300px;min-height:400px;box-shadow:25px 25px 75px var(--shadow-color),10px 10px 70px var(--shadow-color),inset -5px -5px 15px var(--shadow-color),inset 5px 5px 15px var(--shadow-color);transition:all .3s ease}.calculator{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.scientific-keys{display:none;grid-column:span 2;grid-template-columns:repeat(2,1fr);gap:10px}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}50%{transform:translate(5px)}75%{transform:translate(-5px)}}.shake{animation:shake .3s ease-in-out;color:#e74c3c!important}.container.scientific .scientific-keys{display:grid;animation:fadeIn .4s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.container.scientific .calculator{grid-template-columns:repeat(6,1fr)}.container.scientific{min-width:500px}.calculator .value{grid-column:span 4;height:100px;width:calc(100% - 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