:root{--blue:#1565d8;--blue2:#0b4db4;--ink:#10213b;--muted:#64748b;--line:#dfe8f5;--soft:#f4f8ff;--white:#fff;--danger:#e05252;--shadow:0 18px 55px rgba(31,75,140,.11)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink);background:#fff;line-height:1.6}a{color:inherit;text-decoration:none}.container{width:min(1120px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-wrap{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:20px;color:var(--ink)}.brand-mark{width:36px;height:36px;border-radius:11px;background:var(--blue);color:white;display:grid;place-items:center;font-weight:800;box-shadow:0 7px 20px rgba(21,101,216,.24)}.nav{display:flex;gap:26px;font-size:14px;font-weight:600;color:#43536b}.nav a:hover{color:var(--blue)}.menu-btn{display:none;border:0;background:transparent;font-size:24px}.hero{background:linear-gradient(135deg,#f4f8ff 0%,#fff 68%);border-bottom:1px solid var(--line);padding:76px 0 72px}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;align-items:center;gap:70px}.eyebrow{font-size:12px;letter-spacing:.14em;font-weight:800;color:var(--blue)}h1{font-size:clamp(42px,5vw,68px);line-height:1.05;margin:14px 0 22px;letter-spacing:-.04em}h1 span{color:var(--blue)}h2{font-size:30px;line-height:1.2;letter-spacing:-.025em;margin:8px 0 14px}h3{margin:0 0 7px}.hero-copy{font-size:18px;color:#52647d;max-width:650px}.hero-pills{display:flex;gap:10px;flex-wrap:wrap;margin-top:25px}.hero-pills span{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#52647d;font-size:13px;font-weight:600}.hero-card{background:#0f2442;border-radius:26px;padding:28px;color:white;box-shadow:var(--shadow);transform:rotate(0deg)}.mini-display{color:#a9c5f5;font-size:18px;text-align:right}.mini-result{font-size:42px;font-weight:700;text-align:right;margin:20px 0}.mini-bars{display:flex;gap:9px;align-items:end;height:80px}.mini-bars i{display:block;background:#3e83ea;border-radius:7px 7px 0 0;width:18%;height:var(--h,50%)}.mini-bars i:nth-child(1){height:35%}.mini-bars i:nth-child(2){height:60%}.mini-bars i:nth-child(3){height:82%}.mini-bars i:nth-child(4){height:55%}.mini-bars i:nth-child(5){height:72%}.workspace{padding:70px 0 30px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:22px}.status-dot{font-size:12px;color:#2b7a4b;background:#eaf8ef;border:1px solid #ccebd7;padding:6px 10px;border-radius:999px;font-weight:700}.calculator-layout{display:grid;grid-template-columns:1.65fr .85fr;gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.calculator{padding:18px}.calc-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.mode-toggle{display:flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}.mode-toggle button{border:0;background:white;padding:7px 12px;color:var(--muted);font-weight:700;cursor:pointer}.mode-toggle button.active{background:var(--blue);color:white}.ghost-btn{border:0;background:transparent;color:var(--muted);cursor:pointer}.display{background:#f6f9ff;border:1px solid var(--line);border-radius:15px;padding:14px 18px;margin-bottom:10px;text-align:right;min-height:95px}.expression{font-size:15px;color:#8090a8;min-height:24px;overflow:hidden}.result{font-size:34px;font-weight:700;letter-spacing:-.03em;overflow:auto;white-space:nowrap}.memory-row{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-bottom:8px}.memory-row button,.keypad button{border:1px solid var(--line);background:#fff;border-radius:10px;min-height:43px;font-weight:650;cursor:pointer;color:var(--ink);transition:.15s}.memory-row button:hover,.keypad button:hover{border-color:#a9c6ef;background:#f6f9ff}.keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.keypad button{min-height:53px;font-size:16px}.keypad .fn{color:var(--blue);background:#f8fbff}.keypad .operator{background:#eef5ff;color:var(--blue);font-size:20px}.keypad .equals{background:var(--blue);color:white;border-color:var(--blue);font-size:21px}.danger-soft{color:var(--danger)!important}.history{padding:20px;min-height:500px}.panel-title{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:13px}.panel-title h3{font-size:16px}.panel-title span{font-size:12px;background:var(--soft);color:var(--blue);padding:4px 8px;border-radius:8px}.history-list{display:flex;flex-direction:column;gap:10px;margin-top:14px;max-height:430px;overflow:auto}.history-item{padding:11px;border:1px solid var(--line);border-radius:12px;background:#fbfdff}.history-item small{color:var(--muted);display:block}.history-item strong{display:block;text-align:right;font-size:17px}.muted{color:var(--muted);font-size:13px}.tools-section{padding:45px 0 65px}.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.tool{padding:22px}.tool-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:#eaf2ff;color:var(--blue);font-weight:800;margin-bottom:14px}.tool p{color:var(--muted);font-size:14px;margin-top:0}.inputs{display:flex;gap:8px;margin:12px 0}.inputs.three{display:grid;grid-template-columns:repeat(3,1fr)}input,textarea,select{font:inherit;width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;outline:none;background:#fff;color:var(--ink)}input:focus,textarea:focus,select:focus{border-color:#80aef1;box-shadow:0 0 0 3px #e9f2ff}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;padding:11px 16px;font-weight:750;cursor:pointer}.primary{background:var(--blue);color:white}.primary:hover{background:var(--blue2)}.secondary{background:#eaf2ff;color:var(--blue)}.full{width:100%}.tool-output{margin-top:12px;min-height:24px;color:#263b59;font-size:14px}.feature-strip{margin-bottom:80px;background:#0f2442;color:white;border-radius:24px;padding:36px 40px;display:flex;justify-content:space-between;gap:30px;align-items:center}.feature-strip p{color:#b9c8dd;max-width:680px}.feature-strip .eyebrow{color:#8db8ff}.page-hero{padding:65px 0;background:#f4f8ff;border-bottom:1px solid var(--line)}.page-hero h1{font-size:50px}.page-hero p{font-size:18px;color:var(--muted);max-width:700px}.narrow{max-width:850px}.faq-list{padding:45px 0 80px}.faq-list details{border-bottom:1px solid var(--line);padding:20px 0}.faq-list summary{list-style:none;cursor:pointer;font-weight:700;display:flex;justify-content:space-between}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary span{color:var(--blue);font-size:22px}.faq-list p{color:var(--muted);max-width:760px}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:50px 0 85px}.article-card{border:1px solid var(--line);border-radius:20px;padding:25px;box-shadow:var(--shadow);transition:.2s}.article-card:hover{transform:translateY(-4px);border-color:#b4cdf2}.article-card h2{font-size:23px}.article-card p{color:var(--muted)}.article-card span:last-child{color:var(--blue);font-weight:700}.article-tag{display:inline-block;color:var(--blue);background:#eaf2ff;padding:5px 9px;border-radius:999px;font-size:11px;font-weight:800;letter-spacing:.06em}.article-page{max-width:820px;padding:60px 20px 90px}.article-page h1{font-size:52px}.article-page h2{margin-top:38px;font-size:27px}.article-page p,.article-page li{color:#4f6077;font-size:16px}.lead{font-size:20px!important;color:#62748b!important}.article-page code{background:#f0f5fc;padding:2px 5px;border-radius:5px}.callout{margin:30px 0;padding:18px 20px;background:#f3f8ff;border-left:4px solid var(--blue);border-radius:10px}.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:25px;padding:50px 0 85px}.contact-info,.contact-form{padding:28px}.contact-info p{color:var(--muted)}.info-item{display:flex;flex-direction:column;border-top:1px solid var(--line);padding:16px 0}.info-item span{color:var(--muted);font-size:14px}.contact-form{display:flex;flex-direction:column;gap:16px}.contact-form label{font-size:13px;font-weight:700}.contact-form input,.contact-form textarea{display:block;margin-top:6px}.success-msg{color:#2b7a4b}.error-msg{color:#c33}.footer{background:#f4f8ff;border-top:1px solid var(--line);padding:48px 0 22px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:35px}.footer-grid p{color:var(--muted);max-width:430px}.footer-grid strong{display:block;margin-bottom:10px}.footer-grid a:not(.brand){display:block;color:#61728a;font-size:14px;margin:7px 0}.copyright{border-top:1px solid var(--line);margin-top:35px;padding-top:18px;color:#8190a4;font-size:12px}
@media(max-width:850px){.nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;padding:18px 20px;border-bottom:1px solid var(--line);flex-direction:column;gap:14px}.nav.open{display:flex}.menu-btn{display:block}.hero-grid,.calculator-layout,.contact-grid{grid-template-columns:1fr}.hero-card{max-width:520px}.tool-grid,.article-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.container{width:min(100% - 24px,1120px)}.hero{padding:52px 0}.hero-grid{gap:35px}h1{font-size:42px}.page-hero h1,.article-page h1{font-size:40px}.tool-grid,.article-grid,.footer-grid{grid-template-columns:1fr}.feature-strip{padding:27px;display:block}.feature-strip .primary{margin-top:10px}.keypad{gap:5px}.keypad button{min-height:48px}.calculator{padding:12px}.history{min-height:280px}.inputs{flex-direction:column}.inputs.three{display:flex;flex-direction:row}}

/* Private admin inbox */
.admin-narrow{max-width:620px;padding:44px 0 80px}.admin-card{padding:28px}.admin-form{display:flex;flex-direction:column;gap:18px;margin:20px 0}.admin-form label{font-size:13px;font-weight:700}.admin-form input{display:block;margin-top:6px}.admin-form button:disabled{opacity:.55;cursor:not-allowed}.admin-alert{padding:12px 14px;border-radius:10px;margin:12px 0;font-size:14px}.admin-alert.error{background:#fff0f0;color:#a52d2d;border:1px solid #f2caca}.admin-alert.success{background:#eaf8ef;color:#21683c;border:1px solid #ccebd7}.admin-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.admin-heading h1{font-size:clamp(36px,5vw,52px)}.admin-content{padding:32px 0 80px}.admin-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.admin-stat{padding:20px}.admin-stat span{display:block;color:var(--muted);font-size:14px}.admin-stat strong{display:block;font-size:32px;color:var(--blue);margin-top:4px}.admin-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:34px 0 18px}.admin-toolbar h2{font-size:25px}.admin-filters{display:flex;gap:8px;flex-wrap:wrap}.admin-filters .selected{background:var(--blue);color:white}.admin-message-list{display:flex;flex-direction:column;gap:15px}.admin-message{padding:22px}.admin-message.unread{border-color:#8ab5f4;box-shadow:0 8px 28px rgba(21,101,216,.09)}.admin-message-top{display:flex;justify-content:space-between;gap:15px}.admin-message-top h3{font-size:18px;margin:0 0 4px}.admin-message-top a{color:var(--blue);font-size:14px;overflow-wrap:anywhere}.admin-message-top time{color:var(--muted);font-size:12px;white-space:nowrap}.admin-unread-pill{display:inline-block;vertical-align:middle;background:#eaf2ff;color:var(--blue);border-radius:999px;padding:3px 8px;font-size:11px;margin-left:5px}.admin-message-body{white-space:pre-wrap;overflow-wrap:anywhere;background:#f8fbff;border-radius:12px;padding:15px;margin:18px 0;color:#33445d}.admin-message-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.admin-message-actions form{margin:0}.admin-delete{border:1px solid #f0caca;background:#fff7f7;color:#b42323;border-radius:10px;padding:10px 14px;font:inherit;font-weight:700;cursor:pointer}.admin-empty{padding:28px}.admin-empty p{color:var(--muted)}@media(max-width:680px){.admin-heading,.admin-toolbar,.admin-message-top{align-items:flex-start;flex-direction:column}.admin-stats{grid-template-columns:1fr}.admin-card{padding:20px}.admin-message{padding:17px}.admin-message-top time{white-space:normal}}