:root{--bg: #0a0b10;--surface: #14161f;--surface-2: #1c1f2b;--text: #f1f3f8;--text-secondary: #8b92a5;--accent: #7c5cff;--accent-hover: #6a48ff;--accent-2: #22d3ee;--danger: #ef4444;--success: #22c55e;--warning: #eab308;--radius: 16px;--radius-sm: 10px;--maxw: 480px;--font-display: "Plus Jakarta Sans", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{max-width:100%;overflow-x:hidden;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}.container{max-width:var(--maxw);margin:0 auto;padding:0 16px}.section{padding:clamp(24px,4vw,48px) 0;min-height:100vh;display:flex;flex-direction:column}.calculator{background:var(--surface);border-radius:24px;border:1px solid rgba(255,255,255,.06);box-shadow:0 30px 60px -30px #0009;padding:24px;width:100%;max-width:420px;margin:auto;overflow:hidden}.calculator-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.calculator-header h1{font-family:var(--font-display);font-size:1.25rem;font-weight:600;color:var(--text);letter-spacing:-.02em}.badge{font-size:.7rem;padding:4px 10px;border-radius:999px;background:#7c5cff26;color:var(--accent);border:1px solid rgba(124,92,255,.2);font-weight:600;letter-spacing:.02em;text-transform:uppercase}.display{background:var(--bg);border-radius:var(--radius);padding:20px 24px;margin-bottom:20px;min-height:120px;display:flex;flex-direction:column;justify-content:flex-end;align-items:flex-end;font-family:var(--font-mono);overflow:hidden;border:1px solid rgba(255,255,255,.04)}.display-expression{font-size:.95rem;color:var(--text-secondary);word-break:break-all;text-align:right;line-height:1.4;min-height:1.4em;width:100%}.display-result{font-size:clamp(2rem,6vw,2.75rem);font-weight:700;color:var(--text);word-break:break-all;text-align:right;line-height:1.2;width:100%;transition:font-size .15s ease;overflow-wrap:anywhere}.display-result.small{font-size:1.5rem}.history-toggle{display:flex;align-items:center;gap:6px;background:none;border:none;color:var(--text-secondary);font-size:.8rem;cursor:pointer;padding:6px 10px;border-radius:var(--radius-sm);transition:background .15s ease,color .15s ease;font-family:inherit}.history-toggle:hover{background:#ffffff0a;color:var(--text)}.history-panel{background:var(--surface-2);border-radius:var(--radius-sm);margin-bottom:16px;max-height:200px;overflow-y:auto;border:1px solid rgba(255,255,255,.04)}.history-panel::-webkit-scrollbar{width:4px}.history-panel::-webkit-scrollbar-thumb{background:#ffffff14;border-radius:2px}.history-item{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.04);cursor:pointer;transition:background .12s ease}.history-item:last-child{border-bottom:none}.history-item:hover{background:#ffffff08}.history-expr{font-family:var(--font-mono);font-size:.85rem;color:var(--text-secondary)}.history-result{font-family:var(--font-mono);font-size:.9rem;color:var(--text);font-weight:600}.clear-history{display:block;width:100%;padding:8px;background:none;border:none;border-top:1px solid rgba(255,255,255,.06);color:var(--danger);font-size:.78rem;cursor:pointer;transition:background .12s ease;font-family:inherit;border-radius:0 0 var(--radius-sm) var(--radius-sm)}.clear-history:hover{background:#ef444414}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.keypad>.span-2{grid-column:span 2}.btn{display:flex;align-items:center;justify-content:center;height:64px;border:none;border-radius:var(--radius-sm);font-family:var(--font-display);font-size:1.3rem;font-weight:600;cursor:pointer;background:var(--surface-2);color:var(--text);transition:transform .1s ease,background .15s ease,box-shadow .15s ease;user-select:none;-webkit-user-select:none;position:relative}.btn:active{transform:scale(.95)}.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn-number{background:var(--surface-2);color:var(--text)}.btn-number:hover{background:#ffffff14}.btn-operator{background:#7c5cff1f;color:var(--accent)}.btn-operator:hover{background:#7c5cff38}.btn-operator.active{background:var(--accent);color:#fff;box-shadow:0 0 20px #7c5cff4d}.btn-equals{background:var(--accent);color:#fff;font-size:1.6rem}.btn-equals:hover{background:var(--accent-hover);box-shadow:0 8px 24px #7c5cff4d}.btn-equals:active{box-shadow:0 4px 12px #7c5cff33}.btn-function{background:transparent;color:var(--text-secondary);font-size:1rem}.btn-function:hover{background:#ffffff0a;color:var(--text)}.btn-danger{color:var(--danger)}.btn-danger:hover{background:#ef44441a}.btn-percent{font-size:1rem;color:var(--accent-2)}.btn-percent:hover{background:#22d3ee1a}.footer{text-align:center;padding:24px 0 16px;color:var(--text-secondary);font-size:.78rem}@media(max-width:480px){.calculator{padding:16px;border-radius:20px;max-width:100%}.btn{height:56px;font-size:1.15rem}.btn-equals{font-size:1.4rem}.display{padding:14px 18px;min-height:100px}.display-result{font-size:clamp(1.6rem,8vw,2.25rem)}.keypad{gap:8px}}@media(max-width:360px){.btn{height:48px;font-size:1rem}.keypad{gap:6px}}