:root{--glass-bg: rgba(255, 255, 255, .08);--glass-border: rgba(255, 255, 255, .18);--barrier: rgba(15, 18, 45, .45);--text: #f5f7ff;--text-dim: rgba(245, 247, 255, .6);--accent: #7c5cff;--accent-2: #ff7ac6}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh;font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;color:var(--text);background:linear-gradient(135deg,#1e1b4b,#4c1d95,#be185d 70%,#f97316);background-size:300% 300%;animation:gradientShift 18s ease infinite}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 20px;gap:24px}.app-header{text-align:center}.app-header h1{font-size:2rem;font-weight:700;letter-spacing:-.5px}.app-header p{color:var(--text-dim);font-size:.9rem;margin-top:4px}.card{position:relative;background:var(--glass-bg);backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);border:1px solid var(--glass-border);border-radius:24px;box-shadow:0 8px 40px #00000059}.layout{display:flex;gap:24px;align-items:stretch;flex-wrap:wrap;justify-content:center}.history{width:280px;padding:20px;display:flex;flex-direction:column}.history-title{font-size:1.1rem;margin-bottom:14px;font-weight:600}.history-empty{color:var(--text-dim);font-size:.9rem}.history-list{list-style:none;overflow-y:auto;max-height:440px;display:flex;flex-direction:column;gap:10px}.history-item{background:var(--barrier);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:10px 14px}.history-expr{font-size:.95rem;color:var(--text-dim)}.history-result{font-size:1.15rem;font-weight:600}.history-time{font-size:.72rem;color:var(--text-dim);margin-top:2px}.calculator{width:340px;padding:22px}.display{background:var(--barrier);border-radius:18px;padding:18px 20px;margin-bottom:18px;text-align:right;min-height:96px}.display-sub{color:var(--text-dim);font-size:.9rem;min-height:1.1em}.display-main{font-size:2.6rem;font-weight:600;line-height:1.2;overflow-wrap:anywhere}.display-error{color:#ffb4b4;font-size:.8rem;margin-top:4px}.keys{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.key{height:62px;border:1px solid rgba(255,255,255,.12);border-radius:16px;background:#ffffff0f;color:var(--text);font-size:1.3rem;font-weight:500;cursor:pointer;transition:transform .08s ease,background .2s ease,box-shadow .2s ease}.key:hover{background:#ffffff29}.key:active{transform:scale(.94)}.key-fn{background:#ffffff1a;color:var(--text-dim)}.key-op{background:linear-gradient(135deg,var(--accent),var(--accent-2));font-weight:600}.key-op.active{box-shadow:0 0 0 2px #fff inset}.key-zero{grid-column:span 2}.key-equals{background:linear-gradient(135deg,var(--accent-2),var(--accent));font-weight:700}@media (max-width: 640px){.history{width:340px}}