:root{--bg: #000000;--surface: #1c1c1e;--surface-2: #2c2c2e;--surface-3: #3a3a3c;--key: #333333;--key-utility: #a5a5a5;--key-measure: #232326;--accent: #ff9f0a;--accent-soft: rgba(255, 159, 10, .14);--green: #30d158;--red: #ff453a;--text: #f5f5f7;--text-dim: rgba(235, 235, 245, .6);--text-faint: rgba(235, 235, 245, .38);--hairline: rgba(255, 255, 255, .08);--font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", sans-serif;--font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace}@layer base{*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{background:var(--bg)}body{margin:0;min-width:320px;min-height:100dvh;background:var(--bg);color:var(--text);font-family:var(--font-ui);font-synthesis:none;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overscroll-behavior-y:none}button,input,select{font:inherit;color:inherit}button{cursor:pointer;border:0;background:none;padding:0}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:8px}::selection{background:var(--accent);color:#000}}@keyframes rise{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}@keyframes fade{0%{opacity:0}to{opacity:1}}@keyframes pop{0%,to{transform:scale(1)}50%{transform:scale(.92)}}@keyframes shimmer{0%{opacity:.4}50%{opacity:.75}to{opacity:.4}}.app-shell{min-height:100dvh;display:flex;flex-direction:column;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}.app-header{display:flex;align-items:center;justify-content:space-between;height:60px;padding:0 16px;position:sticky;top:0;z-index:10;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:#000000b8;border-bottom:1px solid var(--hairline)}.brand{display:flex;align-items:center;gap:11px;min-width:0}.brand-mark{display:grid;place-items:center;width:34px;height:34px;color:#000;background:linear-gradient(160deg,#ffb340,var(--accent));border-radius:9px;box-shadow:0 4px 14px #ff9f0a47;flex-shrink:0}.brand-name{font-size:17px;letter-spacing:-.02em;font-weight:700;line-height:1.15}.brand-sub{display:block;color:var(--text-faint);font-size:10px;font-weight:600;letter-spacing:.14em;text-transform:uppercase}.header-actions{display:flex;align-items:center;gap:8px}.icon-button{display:grid;place-items:center;width:38px;height:38px;color:var(--text-dim);background:var(--surface);border-radius:50%;transition:background .18s,color .18s,transform .12s}.icon-button:hover{background:var(--surface-2);color:var(--text)}.icon-button:active{transform:scale(.92)}.page-grid{width:min(1120px,100%);margin:0 auto;padding:14px 14px calc(18px + env(safe-area-inset-bottom));display:grid;gap:14px;align-items:start;flex:1}.calculator-card{border:1px solid var(--hairline);background:var(--surface);border-radius:28px;box-shadow:0 24px 60px #0000008c;overflow:hidden;animation:rise .5s cubic-bezier(.2,.8,.25,1) both}.display-panel{padding:18px 18px 20px;background:linear-gradient(180deg,#141416,#000 90%);border-bottom:1px solid var(--hairline);position:relative}.mode-switch{display:flex;padding:2px;gap:2px;border-radius:10px;background:var(--surface-2);margin-bottom:14px}.mode-switch button{flex:1;border-radius:8px;padding:8px 10px;color:var(--text-dim);background:transparent;font-size:13px;font-weight:600;transition:background .2s,color .2s}.mode-switch button.active{background:var(--surface-3);color:var(--text);box-shadow:0 1px 4px #0006}.expression-input{width:100%;border:0;padding:6px 0;background:transparent;color:var(--text-dim);font-family:var(--font-mono);font-size:17px;text-align:right;caret-color:var(--accent);transition:color .2s}.expression-input:focus{outline:none;color:var(--text)}.expression-input::placeholder{color:var(--text-faint)}.result-line{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding-top:2px;min-height:58px}.result-value{margin:0;font-size:clamp(38px,11vw,56px);font-weight:300;letter-spacing:-.03em;line-height:1.1;color:var(--text);white-space:nowrap;overflow-x:auto;scrollbar-width:none;max-width:100%;text-align:right}.result-value::-webkit-scrollbar{display:none}.result-value.compact{font-size:clamp(26px,7.5vw,40px)}.result-unit{color:var(--text-faint);font-size:13px;font-weight:600;white-space:nowrap;padding-bottom:6px}.input-strip{display:grid;grid-template-columns:1fr 1fr 44px;gap:8px;align-items:end;padding:16px 18px 0}.measure-field{min-width:0}.measure-field label,.unit-label{display:block;color:var(--text-faint);text-transform:uppercase;letter-spacing:.1em;font-size:9px;font-weight:700;font-family:var(--font-mono);margin:0 0 6px 4px}.measure-field input,.unit-select,.custom-unit{width:100%;min-width:0;border:1px solid var(--hairline);border-radius:12px;background:var(--surface-2);color:var(--text);padding:11px 12px;font-family:var(--font-mono);font-size:16px;font-weight:600;transition:border-color .18s,background .18s}.measure-field input::placeholder,.custom-unit::placeholder{color:var(--text-faint)}.measure-field input:focus,.unit-select:focus,.custom-unit:focus{outline:none;border-color:var(--accent);background:var(--surface-3)}.use-quick{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;color:#000;background:var(--accent);transition:transform .12s,filter .15s}.use-quick:hover{filter:brightness(1.08)}.use-quick:active{transform:scale(.92)}.unit-field{padding:12px 18px 0;display:flex;gap:8px;align-items:end}.unit-control{flex:1;min-width:0}.unit-select{appearance:none;font-family:var(--font-ui);font-size:13px;padding:11px 32px 11px 12px;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a1a1a6' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}.custom-unit{font-size:13px;padding:11px 12px}.display-conversion{margin:14px 18px 0}.conversion-heading{display:none}.conversion-grid{display:grid;grid-auto-flow:column;grid-auto-columns:max-content;gap:7px;overflow-x:auto;scrollbar-width:none;padding:2px;margin:-2px;-webkit-overflow-scrolling:touch}.conversion-grid::-webkit-scrollbar{display:none}.conversion-grid span{display:inline-flex;align-items:baseline;gap:6px;white-space:nowrap;color:var(--text-faint);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;border:1px solid var(--hairline);border-radius:999px;padding:6px 11px;background:var(--surface-2)}.conversion-grid b{color:var(--text);font:600 12px var(--font-mono);text-transform:none;letter-spacing:0}.error-banner{margin:12px 18px 0;padding:11px 13px;border-radius:12px;background:#ff453a1f;color:var(--red);font-size:12.5px;font-weight:500;display:flex;gap:8px;align-items:center;animation:fade .2s ease both}.error-banner svg{flex-shrink:0}.keypad-wrap{padding:16px}.keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;max-width:420px;margin:0 auto}.key{aspect-ratio:1 / 1;width:100%;max-height:76px;border-radius:50%;font-size:22px;font-weight:500;background:var(--key);color:var(--text);-webkit-user-select:none;user-select:none;touch-action:manipulation;transition:filter .12s ease,transform .08s ease;box-shadow:inset 0 1px #ffffff0a}.key:hover{filter:brightness(1.22)}.key:active{filter:brightness(1.65);transform:scale(.96)}.key.utility{background:var(--key-utility);color:#000;font-weight:600;font-size:19px}.key.utility:hover{filter:brightness(1.06)}.key.utility:active{filter:brightness(1.25);transform:scale(.96)}.key.measure{background:var(--key-measure);color:var(--accent);font-weight:600;font-size:16px;font-family:var(--font-mono)}.key.operator{background:var(--accent);color:#fff;font-size:26px;font-weight:400}.key.equals{background:var(--accent);color:#fff;font-size:26px}.action-row{display:none}.side-stack{display:grid;gap:14px;animation:rise .55s .08s cubic-bezier(.2,.8,.25,1) both}.side-card{padding:18px;border:1px solid var(--hairline);background:var(--surface);border-radius:22px}.side-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.side-heading h2{margin:0;font-size:17px;font-weight:700;letter-spacing:-.02em}.side-heading p{margin:3px 0 0;color:var(--text-faint);font-size:12px}.side-heading svg{color:var(--accent)}.text-button{padding:6px 4px;color:var(--accent);font-size:12px;font-weight:600;border-radius:8px}.text-button:hover{text-decoration:underline}.history-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}.history-item{display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;padding:11px 12px;border-radius:14px;cursor:pointer;transition:background .16s}.history-item:hover{background:var(--surface-2)}.history-item:active{background:var(--surface-3)}.history-expression{margin:0 0 3px;font:12px var(--font-mono);color:var(--text-dim);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-result{margin:0;font:600 16px var(--font-mono);color:var(--text)}.history-secondary{margin:3px 0 0;color:var(--text-faint);font:10px var(--font-mono)}.history-meta{margin:0;color:var(--text-faint);font-size:10px;text-align:right}.history-recall{display:inline-flex;align-items:center;gap:3px;color:var(--accent);padding:4px 0 0;font-size:11px;font-weight:600}.empty-state{text-align:center;padding:24px 12px;border:1px dashed var(--hairline);border-radius:16px}.empty-state-mark{width:36px;height:36px;display:grid;place-items:center;margin:0 auto 10px;border-radius:50%;background:var(--accent-soft);color:var(--accent)}.empty-state p{margin:0;color:var(--text-dim);font-size:12.5px;line-height:1.55}.help-copy{color:var(--text-dim);font-size:13.5px;line-height:1.6}.help-copy strong{color:var(--text)}.shortcut-list{display:grid;gap:8px;margin:14px 0 0;padding:0;list-style:none}.shortcut-list li{display:flex;justify-content:space-between;align-items:center;gap:10px;border-top:1px solid var(--hairline);padding-top:8px;font-size:12.5px;color:var(--text-dim)}kbd{border:1px solid var(--hairline);border-bottom-width:2px;border-radius:6px;background:var(--surface-2);padding:2px 7px;color:var(--text);font:600 10px var(--font-mono)}.dialog-backdrop{position:fixed;inset:0;z-index:30;display:grid;place-items:end center;padding:16px;padding-bottom:calc(16px + env(safe-area-inset-bottom));background:#0009;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fade .2s ease both}.dialog{width:min(100%,440px);border:1px solid var(--hairline);border-radius:24px;padding:22px;background:var(--surface);box-shadow:0 30px 80px #0009;animation:rise .3s cubic-bezier(.2,.8,.25,1) both}.dialog-header{display:flex;align-items:start;justify-content:space-between;gap:14px;margin-bottom:12px}.dialog-header h2{margin:0;font-size:21px;font-weight:700;letter-spacing:-.03em}.dialog-header p{margin:4px 0 0;color:var(--text-faint);font-size:12.5px}.dialog-actions{display:flex;justify-content:stretch;margin-top:18px}.dialog-primary{width:100%;min-height:48px;border-radius:14px;background:var(--accent);color:#fff;font-weight:600;font-size:15px;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:filter .15s,transform .1s}.dialog-primary:hover{filter:brightness(1.08)}.dialog-primary:active{transform:scale(.98)}.app-footer{padding:0 18px calc(20px + env(safe-area-inset-bottom));text-align:center;color:var(--text-faint);font-size:11px;letter-spacing:.05em}.app-footer strong{color:var(--text-dim);font-weight:600}.skeleton-shell{width:min(430px,calc(100% - 32px));margin:18px auto}.skeleton{height:84px;border-radius:22px;background:var(--surface);animation:shimmer 1.3s ease-in-out infinite}.skeleton+.skeleton{margin-top:12px;height:420px}@media(min-width:720px){.app-header{height:66px;padding:0 26px}.page-grid{grid-template-columns:minmax(0,430px) minmax(300px,400px);justify-content:center;gap:22px;padding:26px 26px 34px}.mode-switch{max-width:260px}.result-value{font-size:clamp(42px,6vw,56px)}.result-value.compact{font-size:clamp(32px,4.5vw,44px)}.conversion-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 4px 9px}.conversion-heading span{color:var(--text-faint);font-size:11px;font-weight:600}.conversion-heading strong{font:600 13px var(--font-mono);color:var(--accent);text-align:right}.action-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding-top:14px;max-width:420px;margin:0 auto}.action-button{min-height:46px;border-radius:14px;background:var(--surface-2);color:var(--text-dim);font-weight:600;font-size:13.5px;display:inline-flex;align-items:center;justify-content:center;gap:7px;transition:background .16s,transform .1s}.action-button:hover{background:var(--surface-3);color:var(--text)}.action-button:active{transform:scale(.98)}.action-button.primary{background:var(--accent-soft);color:var(--accent)}.action-button.primary:hover{background:#ff9f0a38}}@media(min-width:1024px){.app-header{height:70px;padding:0 34px}.brand-name{font-size:18px}.keypad-wrap{padding:20px}.dialog-backdrop{place-items:center;padding-bottom:16px}}@media(max-width:719px){.app-header{height:54px}.brand-mark{width:31px;height:31px;border-radius:8px}.brand-name{font-size:15.5px}.brand-sub{font-size:8.5px}.icon-button{width:36px;height:36px}.page-grid{padding:10px 10px calc(14px + env(safe-area-inset-bottom));gap:10px}.calculator-card{border-radius:24px}.display-panel{padding:14px 16px 16px}.expression-input{font-size:15px;min-height:32px}.input-strip,.unit-field{padding-left:14px;padding-right:14px}.unit-field{flex-wrap:wrap}.custom-unit{max-width:130px}.display-conversion{margin:12px 14px 0}.error-banner{margin:10px 14px 0}.keypad{gap:8px;max-width:none}.key{font-size:20px}.key.utility{font-size:16px}.key.measure{font-size:14px}.side-card{border-radius:20px;padding:15px}.history-item{padding:11px 8px}}