#ftp-online-calculator{--primary: #2563eb;--primary-dark: #1d4ed8;--primary-light: #eff6ff;--secondary: #7c3aed;--secondary-light: #f5f3ff;--success: #15803d;--success-light: #f0fdf4;--warning: #b45309;--warning-light: #fffbeb;--danger: #b91c1c;--text: #1f2937;--muted: #64748b;--background: #f4f7fb;--surface: #ffffff;--border: #dbe3ef;--calculator-bg: #1e293b;--calculator-panel: #273449;--display-bg: #0f172a;--number-button: #334155;--number-hover: #475569;--operator-button: #d97706;--operator-hover: #b45309;--scientific-button: #7c3aed;--scientific-hover: #6d28d9;--memory-button: #ca8a04;--memory-hover: #a16207;--equal-button: #15803d;--equal-hover: #166534;--clear-button: #b91c1c;--clear-hover: #991b1b;--shadow: 0 12px 32px rgba(15, 23, 42, .08);--small-shadow: 0 5px 16px rgba(15, 23, 42, .07);--calculator-shadow: 0 20px 45px rgba(15, 23, 42, .28);--radius-large: 18px;--radius-medium: 12px;--radius-small: 8px;width:100%;min-height:100vh;margin:0;color:var(--text);background:radial-gradient(circle at top left,rgba(37,99,235,.08),transparent 32%),var(--background);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.65}#ftp-online-calculator,#ftp-online-calculator *{box-sizing:border-box}#ftp-online-calculator button{font:inherit}#ftp-online-calculator a{color:var(--primary-dark)}#ftp-online-calculator .page-container{width:min(100% - 32px,1100px);margin:0 auto;padding:24px 0 50px}#ftp-online-calculator .page-navigation{position:sticky;top:10px;z-index:100;display:flex;align-items:center;gap:7px;margin-bottom:22px;padding:9px;overflow-x:auto;background:#fffffff5;border:1px solid var(--border);border-radius:14px;box-shadow:var(--small-shadow);backdrop-filter:blur(10px);scrollbar-width:thin}#ftp-online-calculator .page-navigation a,#ftp-online-calculator .page-navigation a:visited{flex:0 0 auto;padding:9px 13px;color:#1f2937;background:transparent;border-radius:8px;font-size:.92rem;font-weight:700;text-decoration:none;white-space:nowrap;transition:color .2s ease,background-color .2s ease,transform .2s ease}#ftp-online-calculator .page-navigation a:hover,#ftp-online-calculator .page-navigation a:focus-visible{color:#000;background:var(--primary-light);outline:none}#ftp-online-calculator .page-navigation a.active,#ftp-online-calculator .page-navigation a.active:visited,#ftp-online-calculator .page-navigation a:active{color:#000!important;background:#dbeafe!important}#ftp-online-calculator .page-navigation a:hover{transform:translateY(-1px)}#ftp-online-calculator .breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:17px;color:var(--muted);font-size:.9rem}#ftp-online-calculator .breadcrumb a{font-weight:700;text-decoration:none}#ftp-online-calculator .breadcrumb a:hover,#ftp-online-calculator .breadcrumb a:focus-visible{color:#000;text-decoration:underline;outline:none}#ftp-online-calculator .hero-section{position:relative;margin-bottom:24px;padding:clamp(30px,6vw,58px);overflow:hidden;color:#fff;background:linear-gradient(135deg,#2563ebfa,#7c3aedf0);border-radius:var(--radius-large);box-shadow:var(--shadow);animation:ftpCalculatorFadeUp .6s ease both}#ftp-online-calculator .hero-section:before{content:"";position:absolute;top:-90px;right:-75px;width:240px;height:240px;background:#ffffff1a;border-radius:50%}#ftp-online-calculator .hero-section:after{content:"";position:absolute;bottom:-100px;left:-70px;width:210px;height:210px;background:#ffffff14;border-radius:50%}#ftp-online-calculator .hero-content{position:relative;z-index:1;max-width:830px}#ftp-online-calculator .hero-label{display:inline-block;margin-bottom:14px;padding:6px 12px;color:#fff;background:#ffffff29;border:1px solid rgba(255,255,255,.3);border-radius:999px;font-size:.82rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}#ftp-online-calculator .hero-section h1{margin:0 0 14px;color:#fff;font-size:clamp(2rem,6vw,3.25rem);line-height:1.15}#ftp-online-calculator .hero-section p{max-width:790px;margin:0;color:#fffffff0;font-size:1.08rem}#ftp-online-calculator .hero-note{display:inline-block;margin-top:16px;padding:8px 12px;color:#fff;background:#ffffff21;border:1px solid rgba(255,255,255,.24);border-radius:8px;font-size:.9rem;font-weight:700}#ftp-online-calculator .quick-access{margin-bottom:24px;padding:22px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-large);box-shadow:var(--shadow);text-align:center}#ftp-online-calculator .quick-access h2{margin:0 0 14px;color:var(--text);font-size:1.3rem}#ftp-online-calculator .quick-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(185px,1fr));gap:11px}#ftp-online-calculator .quick-link,#ftp-online-calculator .quick-link:visited{display:block;padding:11px 14px;color:var(--primary-dark);background:var(--primary-light);border:1px solid #bfdbfe;border-radius:9px;font-size:.94rem;font-weight:700;text-decoration:none;transition:color .2s ease,background-color .2s ease,transform .2s ease}#ftp-online-calculator .quick-link:hover,#ftp-online-calculator .quick-link:focus-visible{color:#000;background:#dbeafe;transform:translateY(-1px);outline:none}#ftp-online-calculator .calculator-section,#ftp-online-calculator .content-section,#ftp-online-calculator .related-tools,#ftp-online-calculator .footer-section{margin-top:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-large);box-shadow:var(--shadow);scroll-margin-top:100px}#ftp-online-calculator .calculator-section,#ftp-online-calculator .content-section,#ftp-online-calculator .related-tools{padding:clamp(22px,5vw,36px);animation:ftpCalculatorFadeUp .65s ease both}#ftp-online-calculator .calculator-section h2,#ftp-online-calculator .content-section h2,#ftp-online-calculator .related-tools h2{margin:0 0 13px;color:var(--text);font-size:clamp(1.35rem,4vw,1.85rem);line-height:1.3}#ftp-online-calculator .calculator-section>h2:after,#ftp-online-calculator .content-section h2:after,#ftp-online-calculator .related-tools h2:after{content:"";display:block;width:50px;height:4px;margin-top:8px;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:999px}#ftp-online-calculator .section-introduction{max-width:840px;margin:0 0 23px;color:var(--muted)}#ftp-online-calculator .content-section h3{margin:25px 0 8px;color:var(--text);font-size:1.18rem}#ftp-online-calculator .content-section p{margin:0 0 14px;color:#334155}#ftp-online-calculator .content-section p:last-child{margin-bottom:0}#ftp-online-calculator .content-section ul,#ftp-online-calculator .content-section ol{margin:0;padding-left:23px}#ftp-online-calculator .content-section li{margin-bottom:9px;color:#334155}#ftp-online-calculator .content-section li:last-child{margin-bottom:0}#ftp-online-calculator .content-section li::marker{color:var(--primary);font-weight:700}#ftp-online-calculator .information-note,#ftp-online-calculator .warning-note{margin-top:17px;padding:15px 17px;border-radius:var(--radius-small)}#ftp-online-calculator .information-note{color:#334155;background:var(--primary-light);border:1px solid #bfdbfe;border-left:4px solid var(--primary)}#ftp-online-calculator .warning-note{color:#78350f;background:var(--warning-light);border:1px solid #fde68a;border-left:4px solid var(--warning)}#ftp-online-calculator .calculator{width:min(100%,470px);margin:0 auto;overflow:hidden;color:#fff;background:var(--calculator-bg);border:1px solid #334155;border-radius:18px;box-shadow:var(--calculator-shadow)}#ftp-online-calculator .display{position:relative;display:flex;min-height:118px;padding:22px;flex-direction:column;justify-content:flex-end;overflow:hidden;background:linear-gradient(145deg,#0f172a,#111827);text-align:right;word-wrap:break-word}#ftp-online-calculator .previous-operand{min-height:27px;overflow:hidden;color:#ffffffa6;font-size:1rem;text-overflow:ellipsis;white-space:nowrap}#ftp-online-calculator .current-operand{min-height:51px;overflow:hidden;color:#fff;font-size:clamp(2rem,8vw,2.8rem);font-weight:700;line-height:1.2;text-overflow:ellipsis;white-space:nowrap}#ftp-online-calculator .memory-indicator{position:absolute;top:11px;left:14px;padding:3px 8px;color:#bae6fd;background:#0ea5e921;border:1px solid rgba(125,211,252,.2);border-radius:999px;font-size:.78rem;font-weight:700}#ftp-online-calculator .calculator-history{max-height:125px;padding:12px 18px;overflow-y:auto;background:#182235;border-top:1px solid #334155;border-bottom:1px solid #334155;font-size:.83rem}#ftp-online-calculator .history-header{margin-bottom:6px;color:#cbd5e1;font-weight:800;text-transform:uppercase;letter-spacing:.04em}#ftp-online-calculator .history-item{padding:6px 0;color:#e2e8f0;border-bottom:1px solid rgba(255,255,255,.08);overflow-wrap:anywhere}#ftp-online-calculator .history-item:last-child{border-bottom:0}#ftp-online-calculator .mode-toggle{display:grid;grid-template-columns:repeat(2,1fr);gap:9px;padding:13px 18px 4px;background:var(--calculator-panel)}#ftp-online-calculator .mode-toggle button{min-height:43px;padding:9px 15px;color:#e2e8f0;background:var(--number-button);border:1px solid #475569;border-radius:8px;cursor:pointer;font-weight:700;transition:color .2s ease,background-color .2s ease,transform .2s ease}#ftp-online-calculator .mode-toggle button:hover,#ftp-online-calculator .mode-toggle button:focus-visible{color:#fff;background:#475569;outline:none}#ftp-online-calculator .mode-toggle button.active{color:#fff;background:linear-gradient(135deg,var(--primary),var(--secondary));border-color:transparent}#ftp-online-calculator .keys{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;padding:18px;background:var(--calculator-panel)}#ftp-online-calculator #scientific-keys{grid-template-columns:repeat(5,1fr)}#ftp-online-calculator .keys button{min-width:0;min-height:50px;padding:10px 7px;color:#fff;border:0;border-radius:8px;cursor:pointer;font-size:.96rem;font-weight:700;box-shadow:inset 0 -2px #00000021;transition:transform .15s ease,filter .15s ease,box-shadow .15s ease}#ftp-online-calculator .keys button:hover,#ftp-online-calculator .keys button:focus-visible{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 5px 12px #00000038;outline:none}#ftp-online-calculator .keys button:active{transform:translateY(0)}#ftp-online-calculator button.number{background:var(--number-button)}#ftp-online-calculator button.number:hover{background:var(--number-hover)}#ftp-online-calculator button.operator{background:var(--operator-button)}#ftp-online-calculator button.operator:hover{background:var(--operator-hover)}#ftp-online-calculator button.equal{background:var(--equal-button)}#ftp-online-calculator button.equal:hover{background:var(--equal-hover)}#ftp-online-calculator button.clear{background:var(--clear-button)}#ftp-online-calculator button.clear:hover{background:var(--clear-hover)}#ftp-online-calculator button.scientific{background:var(--scientific-button)}#ftp-online-calculator button.scientific:hover{background:var(--scientific-hover)}#ftp-online-calculator button.memory{background:var(--memory-button)}#ftp-online-calculator button.memory:hover{background:var(--memory-hover)}#ftp-online-calculator .hidden{display:none}#ftp-online-calculator .calculator-tip{max-width:600px;margin:21px auto 0;padding:13px 15px;color:#334155;background:#f8fafc;border:1px solid var(--border);border-radius:9px;font-size:.9rem;text-align:center}#ftp-online-calculator .feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(205px,1fr));gap:14px;margin-top:20px}#ftp-online-calculator .feature-card{padding:18px;background:#fbfdff;border:1px solid var(--border);border-radius:var(--radius-medium)}#ftp-online-calculator .feature-card h3{margin:0 0 7px;color:var(--text)}#ftp-online-calculator .feature-card p{margin:0;color:var(--muted);font-size:.93rem}#ftp-online-calculator .table-wrap{margin-top:18px;overflow-x:auto}#ftp-online-calculator .function-table{width:100%;min-width:630px;overflow:hidden;background:#fff;border:1px solid var(--border);border-collapse:separate;border-spacing:0;border-radius:10px}#ftp-online-calculator .function-table th,#ftp-online-calculator .function-table td{padding:12px 14px;border-bottom:1px solid #edf2f7;text-align:left;vertical-align:top}#ftp-online-calculator .function-table th{color:var(--text);background:#eaf2ff;font-weight:800}#ftp-online-calculator .function-table tr:last-child td{border-bottom:0}#ftp-online-calculator details{margin-bottom:11px;background:#fbfdff;border:1px solid var(--border);border-radius:var(--radius-medium);transition:border-color .2s ease,box-shadow .2s ease}#ftp-online-calculator details:last-child{margin-bottom:0}#ftp-online-calculator details:hover{border-color:#b6c4d8}#ftp-online-calculator details[open]{border-color:#93c5fd;box-shadow:var(--small-shadow)}#ftp-online-calculator summary{padding:14px 16px;color:var(--text);cursor:pointer;font-weight:700}#ftp-online-calculator details p{margin:0;padding:0 16px 15px}#ftp-online-calculator .related-tools{text-align:center}#ftp-online-calculator .related-tools h2:after{margin-right:auto;margin-left:auto}#ftp-online-calculator .related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(195px,1fr));gap:12px;margin-top:18px}#ftp-online-calculator .related-card,#ftp-online-calculator .related-card:visited{display:block;padding:17px 14px;color:var(--text);background:linear-gradient(135deg,var(--primary-light),var(--secondary-light));border:1px solid #c4b5fd;border-radius:10px;font-weight:800;text-decoration:none;transition:color .2s ease,transform .2s ease,box-shadow .2s ease}#ftp-online-calculator .related-card:hover,#ftp-online-calculator .related-card:focus-visible{color:#000;transform:translateY(-2px);box-shadow:var(--small-shadow);outline:none}#ftp-online-calculator .footer-section{padding:23px;text-align:center}#ftp-online-calculator .footer-section p{margin:0 0 10px;color:var(--muted)}#ftp-online-calculator .footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:9px 16px}#ftp-online-calculator .footer-links a,#ftp-online-calculator .footer-links a:visited{color:var(--primary-dark);font-weight:700;text-decoration:none}#ftp-online-calculator .footer-links a:hover,#ftp-online-calculator .footer-links a:focus-visible{color:#000;text-decoration:underline;outline:none}@keyframes ftpCalculatorFadeUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@media(max-width:760px){#ftp-online-calculator .page-container{width:min(100% - 20px,1100px);padding-top:12px}#ftp-online-calculator .page-navigation{top:5px;margin-bottom:15px;border-radius:11px}#ftp-online-calculator .hero-section{padding:31px 22px;border-radius:15px}#ftp-online-calculator .calculator-section,#ftp-online-calculator .content-section,#ftp-online-calculator .quick-access,#ftp-online-calculator .related-tools,#ftp-online-calculator .footer-section{border-radius:14px}}@media(max-width:520px){#ftp-online-calculator{font-size:15px}#ftp-online-calculator .page-container{width:min(100% - 14px,1100px)}#ftp-online-calculator .page-navigation a{padding:8px 11px;font-size:.86rem}#ftp-online-calculator .hero-section{padding:27px 18px}#ftp-online-calculator .calculator-section,#ftp-online-calculator .content-section,#ftp-online-calculator .quick-access,#ftp-online-calculator .related-tools{padding:19px 15px}#ftp-online-calculator .keys{gap:7px;padding:14px}#ftp-online-calculator #scientific-keys{grid-template-columns:repeat(4,1fr)}#ftp-online-calculator .keys button{min-height:46px;padding:9px 5px;font-size:.85rem}#ftp-online-calculator .quick-links,#ftp-online-calculator .feature-grid,#ftp-online-calculator .related-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){#ftp-online-calculator,#ftp-online-calculator *,#ftp-online-calculator *:before,#ftp-online-calculator *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}