/* OLCalc Scientific Calculator
   Tailwind CSS is loaded from the official Play CDN in index.html.
   This stylesheet contains the page-specific component styling that preserves
   the supplied reference design; utility classes can be used directly in HTML.
*/
:root{--blue:#2d5bdb;--blue-dark:#2048bd;--ink:#17233d;--muted:#61708a;--line:#e4eaf3;--bg:#f6f8fc;--mint:#dff8ef;--white:#fff;--shadow:0 18px 50px rgba(31,57,108,.09)}
    *{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.container{width:min(1160px,calc(100% - 40px));margin-inline: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{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;letter-spacing:-.03em}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--blue);color:#fff;font-weight:900}.nav-links{display:flex;align-items:center;gap:24px;font-size:14px;font-weight:650}.nav-links a{color:#465570}.nav-cta,.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue);color:white;border:0;border-radius:12px;padding:12px 18px;font-weight:750;cursor:pointer;box-shadow:0 8px 18px rgba(45,91,219,.17)}.nav-cta:hover,.primary-btn:hover{background:var(--blue-dark);text-decoration:none}.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px;font-size:20px}.hero{padding:66px 0 38px;text-align:center;background:radial-gradient(ellipse at 50% 0%,#e9efff 0,transparent 60%)}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid #dce5ff;background:#fff;border-radius:999px;color:var(--blue);font-size:12px;font-weight:850;letter-spacing:.08em}.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:#25b98a}.hero h1{font-size:clamp(36px,5vw,56px);line-height:1.12;letter-spacing:-.045em;margin:20px auto 16px;max-width:850px}.hero p{max-width:760px;margin:0 auto;color:var(--muted);font-size:18px}.hero-points{display:flex;justify-content:center;flex-wrap:wrap;gap:10px 22px;margin-top:22px;color:#52617a;font-size:14px;font-weight:650}.hero-points span:before{content:'✓';color:#19a77b;font-weight:900;margin-right:7px}.section{padding:38px 0}.section-head{text-align:center;max-width:760px;margin:0 auto 26px}.section-kicker{color:var(--blue);font-size:12px;font-weight:850;letter-spacing:.12em;text-transform:uppercase}.section h2{font-size:clamp(27px,3.5vw,38px);line-height:1.2;letter-spacing:-.035em;margin:8px 0 12px}.section-head p,.muted{color:var(--muted)}.calculator-layout{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(260px,.7fr);gap:22px;align-items:start}.calculator-card,.side-card,.content-card,.faq-item{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.calculator-card{padding:22px;max-width:100%;}.calc-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.calc-title{font-weight:850;font-size:16px}.calc-subtitle{font-size:12px;color:var(--muted)}.mode-toggle{display:flex;background:#f0f4fb;padding:4px;border-radius:10px;gap:3px}.mode-toggle button{border:0;background:transparent;color:#63708a;padding:8px 12px;border-radius:7px;font-size:12px;font-weight:850;cursor:pointer}.mode-toggle button.active{background:#fff;color:var(--blue);box-shadow:0 2px 8px #1d315010}.display{border:1px solid #dce4f2;background:#f9fbff;border-radius:16px;padding:16px 18px;margin-bottom:16px;min-height:112px;display:flex;flex-direction:column;justify-content:space-between;gap:8px}.expression{font-size:15px;color:#72809a;min-height:24px;overflow-wrap:anywhere}.result-line{display:flex;align-items:end;justify-content:space-between;gap:12px}.result{font-size:clamp(28px,4vw,40px);line-height:1.15;font-weight:800;letter-spacing:-.035em;overflow-wrap:anywhere}.result.error{font-size:17px;color:#c2413a;letter-spacing:0}.copy-btn{border:1px solid var(--line);background:#fff;color:#56647d;border-radius:9px;padding:7px 10px;cursor:pointer;font-size:12px;font-weight:750}.keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.key{min-height:48px;border:1px solid #e3e9f3;background:#fff;border-radius:12px;color:#253550;font-size:15px;font-weight:750;cursor:pointer;transition:transform .12s,border-color .12s,background .12s}.key:hover{border-color:#b8c9fa;background:#f6f8ff}.key:active{transform:scale(.97)}.key.fn{background:#f1f5ff;color:#2d55c5;border-color:#e0e8ff}.key.op{background:#edf2ff;color:#244fc9}.key.clear{background:#fff2f0;color:#bd4b43;border-color:#ffe1dc}.key.equals{background:var(--blue);color:#fff;border-color:var(--blue);font-size:19px}.key.equals:hover{background:var(--blue-dark)}.calc-foot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:14px;color:#7b879c;font-size:12px}.side-card{padding:22px}.side-card h3{font-size:17px;margin:0 0 5px}.side-card p{font-size:13px;color:var(--muted);margin:0 0 16px}.history-list{display:grid;gap:9px}.history-empty{padding:16px 12px;border:1px dashed #dce4f0;border-radius:12px;text-align:center;color:#8994a8;font-size:13px}.history-item{border:1px solid var(--line);background:#fbfcff;border-radius:12px;padding:10px 12px;text-align:left;cursor:pointer;min-width:0}.history-item:hover{border-color:#b8c9fa}.history-expression{display:block;color:#73809a;font-size:12px;overflow-wrap:anywhere}.history-result{display:block;font-weight:800;color:#243654;overflow-wrap:anywhere}.side-tip{margin-top:18px;background:#effbf6;border:1px solid #d7f4e8;border-radius:13px;padding:13px;font-size:12px;color:#426958}.content-card{padding:28px}.content-card h3{margin:0 0 8px;font-size:19px}.content-card p{color:var(--muted);margin:0 0 12px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.feature-icon{width:42px;height:42px;display:grid;place-items:center;background:#eef3ff;color:var(--blue);border-radius:13px;font-size:21px;margin-bottom:14px}.feature-card h3{font-size:17px;margin:0 0 7px}.feature-card p{margin:0;color:var(--muted);font-size:14px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.step{padding:22px;border-radius:18px;background:#fff;border:1px solid var(--line)}.step-number{font-size:12px;font-weight:900;color:var(--blue);background:#eef3ff;border-radius:8px;padding:6px 9px;display:inline-block;margin-bottom:12px}.step h3{margin:0 0 8px;font-size:17px}.step p{color:var(--muted);font-size:14px;margin:0}.function-table{width:100%;border-collapse:collapse;font-size:14px}.function-table th,.function-table td{text-align:left;padding:13px 12px;border-bottom:1px solid var(--line)}.function-table th{background:#f7f9fd;color:#4d5c75;font-size:12px;text-transform:uppercase;letter-spacing:.06em}.function-table code{background:#f0f4fb;padding:3px 6px;border-radius:6px;color:#254ec3}.example-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.example{padding:16px;border:1px solid var(--line);border-radius:14px;background:#fbfcff}.example code{display:block;font-size:16px;font-weight:800;color:#244fc9;margin-bottom:4px}.example span{font-size:13px;color:var(--muted)}.faq-list{display:grid;gap:12px;max-width:850px;margin:auto}.faq-item{padding:19px 22px;box-shadow:none}.faq-item h3{font-size:16px;margin:0 0 6px}.faq-item p{margin:0;color:var(--muted);font-size:14px}.cta-panel{background:linear-gradient(120deg,#edf2ff,#e7fbf4);border:1px solid #dce7fb;border-radius:22px;padding:32px;text-align:center}.cta-panel h2{margin-top:0}.site-footer{margin-top:30px;background:#fff;border-top:1px solid var(--line);padding:30px 0}.footer-row{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}.footer-links{display:flex;gap:16px;flex-wrap:wrap;font-size:13px}.footer-links a{color:#5c6a82}.copyright{color:#8994a8;font-size:12px;margin-top:16px}.small-note{font-size:12px;color:#8490a4}.mobile-nav{display:none}
    @media(max-width:850px){.nav-links{gap:13px}.nav-links a:not(.nav-cta){display:none}.calculator-layout{grid-template-columns:1fr}.side-card{order:2}.feature-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:560px){.container{width:min(100% - 24px,1160px)}.nav{height:64px}.nav-links{display:none}.menu-btn{display:block}.mobile-nav.open{display:grid;gap:0;background:#fff;border-top:1px solid var(--line);padding:6px 12px 12px}.mobile-nav a{padding:10px 8px;color:#465570;font-weight:650}.hero{padding:45px 0 24px}.hero p{font-size:16px}.section{padding:27px 0}.calculator-card,.side-card,.content-card{padding:15px;border-radius:17px}.keypad{gap:6px}.key{min-height:45px;border-radius:10px;font-size:14px}.calc-top{align-items:flex-start}.feature-grid,.steps,.example-list{grid-template-columns:1fr}.function-table th,.function-table td{padding:10px 7px;font-size:12px}.content-card{overflow-x:auto}.cta-panel{padding:25px 17px}.footer-row{align-items:flex-start;flex-direction:column}}