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var(--border);background:var(--key);color:var(--key-text);border-radius:var(--radius-sm);padding:14px;font-size:1.15rem;font-weight:500;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out);-webkit-tap-highlight-color:transparent}.btn:hover:not(:disabled){background:var(--key-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn:active:not(:disabled){transform:translateY(1px) scale(.97);box-shadow:none;transition-duration:60ms}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.is-pressed{transform:translateY(1px) scale(.96);box-shadow:none;filter:brightness(1.08)}.key,.btn-small,.btn-primary{overflow:hidden}.key:after,.btn-small:after,.btn-primary:after{content:"";position:absolute;left:var(--ripple-x, 50%);top:var(--ripple-y, 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12px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--key);color:var(--text);transition:border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out)}.filter select:hover,.inline-form input:hover{border-color:var(--accent)}.table-wrap{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--border)}.table{width:100%;border-collapse:separate;border-spacing:0;font-size:.92rem}.table th,.table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:middle}.table thead th{position:sticky;top:0;background:var(--key-control);color:var(--muted);font-weight:600;font-size:.75rem;letter-spacing:.04em;text-transform:uppercase}.table tbody tr{animation:fade-up var(--dur) var(--ease-out) both;transition:background var(--dur-fast) var(--ease-out)}.table tbody tr:hover{background:var(--accent-soft)}.table tbody tr:last-child td{border-bottom:none}.table tbody tr.is-removing{animation:row-out var(--dur) var(--ease-out) forwards}.expression{white-space:nowrap}.expression .op-badge{margin-right:8px}.mono{font-family:var(--font-mono)}.note{font-style:italic}.nowrap{white-space:nowrap}.confirm-label{color:var(--danger);font-weight:600;font-size:.85rem}.numeric{font-family:var(--font-mono);font-weight:600;color:var(--accent)}.inline-form{display:inline-flex;align-items:center;gap:6px;animation:fade-in var(--dur-fast) var(--ease-out) both}.inline-form input{min-width:200px}.actions{white-space:nowrap}.pagination{display:flex;align-items:center;gap:14px;margin-top:16px}.page-info{font-size:.9rem;color:var(--muted)}.op-badge{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:7px;font-family:var(--font-mono);font-size:.85rem;font-weight:700;color:#fff;background:var(--op-color, var(--accent));box-shadow:0 4px 10px -4px var(--op-color, var(--accent));flex-shrink:0}[data-operation=ADD]{--op-color: #16a34a}[data-operation=SUBTRACT]{--op-color: #ea580c}[data-operation=MULTIPLY]{--op-color: #7c3aed}[data-operation=DIVIDE]{--op-color: #0284c7}[data-operation=POWER]{--op-color: #db2777}[data-operation=SQRT]{--op-color: #0d9488}.filter-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.filter-chip{border:1px solid var(--border);background:var(--key);color:var(--text-soft);border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:500;cursor:pointer;transition:transform var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out),color var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out)}.filter-chip:hover{transform:translateY(-1px);border-color:var(--op-color, var(--accent));color:var(--text)}.filter-chip.is-active{background:var(--op-color, var(--accent));border-color:transparent;color:#fff;box-shadow:0 8px 18px -8px var(--op-color, var(--accent))}.filter-chip:focus-visible{box-shadow:var(--ring)}.empty-state{text-align:center;padding:40px 20px;animation:fade-up var(--dur-slow) var(--ease-out) both}.empty-state-icon{display:inline-grid;place-items:center;width:56px;height:56px;border-radius:18px;background:var(--accent-soft);color:var(--accent);font-size:1.6rem;margin-bottom:10px}.skeleton-table{display:flex;flex-direction:column;gap:10px;padding:6px 0}.skeleton-row{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:12px;animation:fade-in var(--dur) var(--ease-out) both}.skeleton-cell{height:36px}.route{animation:route-in var(--dur-slow) var(--ease-out) both}.toast-container{position:fixed;right:24px;bottom:24px;z-index:50;display:flex;flex-direction:column;gap:10px;pointer-events:none}.toast{display:flex;align-items:center;gap:10px;min-width:240px;max-width:360px;padding:12px 16px;border-radius:var(--radius-md);background:var(--surface-strong);color:var(--text);border:1px solid var(--surface-border);box-shadow:var(--shadow-lg);font-size:.9rem;font-weight:500;pointer-events:auto;cursor:pointer;animation:toast-in var(--dur-slow) var(--ease-spring) both}.toast.is-leaving{animation:toast-out var(--dur) var(--ease-out) forwards}.toast-icon{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;color:#fff;font-size:.8rem;font-weight:700;background:var(--success);flex-shrink:0}.toast-info .toast-icon{background:var(--accent)}.toast-error .toast-icon{background:var(--danger)}.login-screen{position:relative;min-height:100vh;display:grid;place-items:center;padding:72px 20px 40px}.login-tools{position:absolute;top:16px;right:20px;display:flex;align-items:center;gap:12px;animation:fade-in var(--dur-slow) var(--ease-out) both}.login-card{width:100%;max-width:400px;padding:32px 28px 24px;display:flex;flex-direction:column;gap:16px;box-shadow:var(--shadow-lg);animation:fade-up var(--dur-slow) var(--ease-out) both}.login-brand{display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;margin-bottom:8px}.login-brand h1{margin:8px 0 0;font-size:1.5rem;font-weight:700;letter-spacing:-.02em}.login-brand .muted{margin:0}.logo-large{width:56px;height:56px;border-radius:18px;font-size:1.6rem;box-shadow:0 14px 30px -10px var(--accent);animation:result-pop var(--dur-slow) var(--ease-spring) both}.field{display:flex;flex-direction:column;gap:6px}.field>span{font-size:.8rem;font-weight:600;letter-spacing:.02em;text-transform:uppercase;color:var(--muted)}.field input{width:100%;padding:12px 14px;font-size:1rem;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--key);color:var(--text);transition:border-color var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out)}.field input:hover:not(:disabled){border-color:var(--accent)}.field input:focus-visible{border-color:var(--accent);background:var(--key-hover)}.field input:disabled{opacity:.6;cursor:not-allowed}#login-error:empty{display:none}#login-error .error-message{margin:0}.btn-block{width:100%;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 16px;font-size:1rem}.spinner-light{border-color:#ffffff59;border-top-color:#fff}.login-demo{display:flex;flex-direction:column;gap:10px;margin-top:4px;padding-top:18px;border-top:1px solid var(--surface-border)}.login-demo>.muted{font-size:.8rem}.login-demo-list{display:flex;flex-direction:column;gap:8px}.demo-user{display:flex;align-items:center;gap:12px;width:100%;padding:8px 10px;text-align:left;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--key);color:var(--text);cursor:pointer;transition:transform var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out);-webkit-tap-highlight-color:transparent}.demo-user:hover:not(:disabled){background:var(--key-hover);border-color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.demo-user:active:not(:disabled){transform:translateY(1px) scale(.99);box-shadow:none}.demo-user:disabled{opacity:.5;cursor:not-allowed}.demo-user[data-role=calculator-admin] .avatar{background:linear-gradient(135deg,var(--danger),#f59e0b)}.demo-user-text{display:flex;flex-direction:column;min-width:0;line-height:1.25}.demo-user-name{font-weight:600;font-size:.9rem}.demo-user-role{font-size:.72rem;color:var(--muted);font-family:var(--font-mono)}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes fade-up{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slide-down{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}@keyframes result-pop{0%{opacity:0;transform:translateY(8px) scale(.96)}60%{opacity:1}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-2px)}80%{transform:translate(2px)}}@keyframes ripple{0%{opacity:.35;transform:translate(-50%,-50%) scale(0)}to{opacity:0;transform:translate(-50%,-50%) scale(18)}}@keyframes row-out{to{opacity:0;transform:translate(24px)}}@keyframes route-in{0%{opacity:0;transform:translateY(12px) scale(.995)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes toast-in{0%{opacity:0;transform:translateY(16px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes toast-out{to{opacity:0;transform:translateY(8px) scale(.98)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media(max-width:820px){.header{flex-wrap:wrap;gap:12px;padding:12px 16px}.nav{order:3;width:100%}.nav a{min-width:0;flex:1}.title-text{min-width:0}.main{padding:20px 16px 40px}.calculator,.history-panel{width:100%}.history-page .panel{min-width:0;width:100%}.login-screen{padding:64px 16px 24px;align-items:start}.login-tools{right:16px}.login-card{padding:26px 20px 20px}}