:root{--bg:#080d18;--panel:#101a2a;--panel2:#131f31;--line:#25344a;--text:#edf4ff;--muted:#9aaac0;--mint:#70f0ce;--blue:#7aa8ff;--purple:#9d8cff;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input{font:inherit}.wrap{width:min(1160px,calc(100% - 40px));margin:auto}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100vw - 1160px)/2));border-bottom:1px solid #ffffff0c;background:#080d18ed;position:sticky;top:0;z-index:20;backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:850;letter-spacing:-.5px;line-height:1.05}.brand small{display:block;font-size:8px;letter-spacing:2px;color:var(--muted);margin-top:5px;font-weight:700}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#70f0ce,#7aa8ff);color:#08121e;font-size:23px}.brand-mark.small{width:34px;height:34px;font-size:20px}.accent{color:var(--mint)}nav{display:flex;gap:28px;color:#b9c7d9;font-size:13px}nav a:hover,.footer-links a:hover{color:var(--mint)}.top-cta{border:1px solid #70f0ce55;border-radius:10px;padding:10px 14px;color:var(--mint);font-size:12px;font-weight:750}.top-cta span{margin-left:8px}.menu-toggle{display:none;background:none;color:white;border:0;font-size:23px}.hero{min-height:520px;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:38px;padding-top:66px;padding-bottom:58px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:850;color:var(--mint);display:flex;align-items:center;gap:9px}.pulse,.live-dot{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 15px #70f0ce99;display:inline-block}.hero h1{font-size:clamp(44px,5.2vw,68px);letter-spacing:-3.8px;line-height:1.03;margin:22px 0}.gradient{background:linear-gradient(95deg,var(--mint),var(--blue) 62%,var(--purple));background-clip:text;color:transparent}.hero-lede{font-size:16px;color:#aebdd0;max-width:570px;line-height:1.8}.hero-actions{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;border-radius:11px;padding:13px 18px;font-size:13px;font-weight:800;cursor:pointer;border:1px solid transparent}.btn.primary{color:#07141d;background:var(--mint);box-shadow:0 8px 30px #70f0ce1a}.btn.primary:hover{filter:brightness(1.08);transform:translateY(-1px)}.btn.ghost{border-color:#ffffff20;color:#d4deec;background:#ffffff04}.trust-row{display:flex;gap:17px;flex-wrap:wrap;margin-top:27px;color:#8294ab;font-size:10px}.hero-visual{height:380px;position:relative;display:grid;place-items:center}.orbit{position:absolute;border:1px solid #7aa8ff22;border-radius:50%;transform:rotate(-24deg)}.orbit-a{width:370px;height:290px}.orbit-b{width:300px;height:380px;transform:rotate(39deg);border-color:#70f0ce25}.mini-device{position:relative;z-index:2;width:min(310px,85%);padding:16px;border:1px solid #41536d;border-radius:23px;background:linear-gradient(145deg,#1a2a40,#0c1524);box-shadow:0 35px 90px #0008,0 0 55px #70f0ce12;transform:rotate(-4deg)}.device-head{display:flex;justify-content:space-between;color:#90a6bf;font-size:8px;letter-spacing:2px;margin-bottom:12px}.device-led{width:6px;height:6px;background:var(--mint);border-radius:50%}.device-screen{background:#07131d;border:1px solid #2d4c5b;border-radius:10px;padding:10px}.screen-label{font-size:8px;letter-spacing:1px;color:#7897a5}.device-screen svg{width:100%;display:block;margin:6px 0}.screen-foot{display:flex;justify-content:space-between;color:#7cead0;font:8px ui-monospace,monospace}.live-dot{width:5px;height:5px}.device-keys{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin-top:14px}.device-keys i{height:14px;border-radius:4px;border:1px solid #40516a;background:linear-gradient(#283950,#172337)}.float-chip{position:absolute;z-index:3;padding:10px 13px;border:1px solid #344761;background:#111d2cdd;backdrop-filter:blur(12px);border-radius:12px;font-size:11px;color:var(--mint);box-shadow:0 12px 35px #0004}.float-chip b{display:block;color:#e7f0fb;font-size:10px;margin-top:3px}.chip-one{top:43px;right:0}.chip-two{bottom:38px;left:0}.stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0}.stats div{display:flex;align-items:center;gap:13px;border-right:1px solid var(--line);padding-left:24px}.stats div:first-child{padding-left:0}.stats div:last-child{border:0}.stats strong{font-size:22px;color:var(--mint);letter-spacing:-1px}.stats span{font-size:11px;color:#9aabc1}.calc-section,.content-section,.faq-section{padding-top:90px;padding-bottom:76px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:27px}.section-heading h2,.cta-inner h2{font-size:clamp(28px,3vw,40px);line-height:1.15;letter-spacing:-1.6px;margin:12px 0 8px}.section-heading p,.cta-inner p{color:var(--muted);margin:0;font-size:13px}.status-pill{font-size:10px;color:#a9bdd2;border:1px solid var(--line);border-radius:99px;padding:8px 12px;white-space:nowrap}.status-pill i{display:inline-block;width:6px;height:6px;background:var(--mint);border-radius:50%;margin-right:7px}.calculator-shell{display:grid;grid-template-columns:220px minmax(0,1fr);border:1px solid #304058;border-radius:19px;overflow:hidden;background:#0d1625;box-shadow:0 24px 80px #0003}.calc-sidebar{padding:22px 14px;background:#0a1220;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:8px}.calc-brand{display:flex;gap:10px;align-items:center;padding:0 5px 23px}.calc-brand b{display:block;font-size:10px;letter-spacing:1px}.calc-brand small{display:block;color:#7488a1;font-size:7px;letter-spacing:1px;margin-top:3px}.mode{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid transparent;background:transparent;color:#9eb0c6;border-radius:10px;padding:12px 10px;cursor:pointer}.mode>span:first-child{font-size:21px;color:#8ea4bd;width:25px;text-align:center}.mode b{display:block;font-size:11px;color:#dce7f6}.mode small{display:block;font-size:9px;color:#7e91a9;margin-top:3px}.mode.active{background:#70f0ce12;border-color:#70f0ce2c}.mode.active>span:first-child{color:var(--mint)}.sidebar-note{margin-top:auto;border:1px solid #26384f;background:#101c2c;border-radius:12px;padding:13px}.note-icon{color:var(--mint);font-size:17px}.sidebar-note b{display:block;font-size:10px;margin-top:8px}.sidebar-note p{font-size:9px;line-height:1.6;color:#8c9fb5;margin-bottom:0}.calc-main{min-width:0;padding:22px}.calc-topline{display:flex;justify-content:space-between;align-items:center;color:#8ea4bd;font-size:9px;font-weight:800;letter-spacing:1.3px;margin-bottom:14px}.calc-topline>div{display:flex;gap:7px}.tiny-toggle{font-size:8px;letter-spacing:.5px;color:#a8bdd1;background:#111f30;border:1px solid #2c3f56;border-radius:6px;padding:6px 9px;cursor:pointer}.tiny-toggle:hover{border-color:var(--mint)}.display{background:#07101c;border:1px solid #263b50;border-radius:12px;padding:15px 17px;margin-bottom:15px}.display label,.result-line span{display:block;font-size:8px;letter-spacing:1.4px;color:#718ba4;font-weight:800}.display input{background:transparent;border:0;border-bottom:1px solid #1b2b3d;width:100%;padding:10px 0;color:#e6f2ff;font:18px ui-monospace,SFMono-Regular,Consolas,monospace;outline:none}.display input:focus{border-color:var(--mint)}.result-line{display:flex;align-items:end;justify-content:space-between;padding-top:12px;gap:10px}.result-line output{font:clamp(18px,2.4vw,28px) ui-monospace,monospace;color:var(--mint);overflow-wrap:anywhere;text-align:right}.error{font-size:10px;color:#ff9aab;margin-top:5px}.calc-workspace{min-height:280px}.keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}.keypad button{border:1px solid #263a51;background:linear-gradient(145deg,#18263a,#121d2e);color:#d9e7f7;border-radius:8px;min-height:41px;cursor:pointer;font-size:13px;font-weight:700;transition:transform .12s,border-color .12s}.keypad button:hover{border-color:#70f0ce88;transform:translateY(-1px)}.keypad button:nth-child(-n+5){color:var(--mint);background:#122b32}.keypad .utility{color:#ffb3c1}.keypad .equals{grid-column:span 4;background:var(--mint);color:#07141d;border-color:var(--mint);font-size:12px}.calc-bottom{display:flex;justify-content:space-between;gap:10px;color:#71869d;font-size:9px;border-top:1px solid #1e2e43;margin-top:19px;padding-top:14px}.secure-dot{display:inline-block;width:5px;height:5px;background:var(--mint);border-radius:50%;margin-right:5px}.graph-panel,.history-panel{border:1px solid #273b52;background:#091320;border-radius:12px;padding:13px}.graph-controls{display:flex;align-items:center;gap:8px;margin-bottom:12px}.graph-controls label{font:12px ui-monospace,monospace;color:var(--mint)}.graph-controls input{flex:1;min-width:0;background:#111e2d;color:#edf5ff;border:1px solid #2c4057;border-radius:7px;padding:9px;font:12px ui-monospace,monospace}.btn.compact{padding:8px 12px;font-size:11px}#graph-canvas{width:100%;height:auto;display:block;border:1px solid #23364b;border-radius:8px;background:#07101b}.graph-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;color:#91a5bd;font-size:9px;margin-top:10px}.zoom-btn{border:1px solid #2d4159;background:#122034;color:#dbe9f7;border-radius:6px;padding:4px 9px;cursor:pointer}.microcopy{font-size:9px;color:#71849b;line-height:1.5}.hidden{display:none!important}.history-panel h3{font-size:13px;margin:3px 0 10px}.history-panel ul{list-style:none;padding:0;margin:0}.history-panel li{padding:10px 0;border-top:1px solid #1c2e43;font-size:11px;color:#b6c7d9;display:flex;justify-content:space-between;gap:12px}.history-panel li b{color:var(--mint);font-family:ui-monospace,monospace}.empty-history{color:#72869e!important}.feature-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.feature-strip>div{border:1px solid var(--line);background:#0d1725;border-radius:12px;padding:17px;display:grid;grid-template-columns:30px 1fr;column-gap:9px}.feature-strip>div>span{grid-row:span 2;font-size:22px;color:var(--mint)}.feature-strip b{font-size:11px}.feature-strip small{color:#8296ae;font-size:9px;margin-top:3px}.content-section{border-top:1px solid #1a293d}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.info-card{padding:24px;border:1px solid var(--line);background:linear-gradient(145deg,#111d2d,#0c1422);border-radius:15px}.card-icon{width:42px;height:42px;display:grid;place-items:center;background:#70f0ce12;color:var(--mint);border:1px solid #70f0ce28;border-radius:12px;font-size:22px}.info-card h3{font-size:16px;margin:20px 0 9px}.info-card p,.guide-card p{color:#9aabc0;font-size:12px;line-height:1.8}.info-card code{color:#b9f8e9;background:#172a35;padding:2px 4px;border-radius:4px}.info-card>a,.guide-card>a{font-size:11px;font-weight:800;color:var(--mint);display:inline-block;margin-top:8px}.guides-section{padding:80px 0;background:#0b1321;border-top:1px solid #1b2b40;border-bottom:1px solid #1b2b40}.guide-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.guide-card{padding:20px;border:1px solid #283951;background:#101b2b;border-radius:13px}.guide-number{font-size:8px;letter-spacing:1.5px;color:var(--mint);font-weight:800}.guide-card h3{font-size:14px;line-height:1.35;margin:16px 0 8px}.faq-section{padding-top:82px;padding-bottom:85px}.faq-list{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line);padding:0 3px}summary{cursor:pointer;list-style:none;padding:19px 30px 19px 0;font-size:13px;font-weight:750;position:relative}summary::-webkit-details-marker{display:none}summary:after{content:'+';position:absolute;right:3px;color:var(--mint);font-size:20px;top:14px}details[open] summary:after{content:'−'}details p{font-size:12px;color:#9caec3;max-width:850px;line-height:1.8;margin:0 0 20px}.bottom-cta{border-top:1px solid #25344a;background:radial-gradient(ellipse at 10% 0%,#70f0ce10,transparent 45%),#0d1726;padding:45px 0}.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:25px}.cta-inner h2{font-size:30px}.footer{border-top:1px solid #1e2e43;padding:32px 0 20px;background:#070c15}.footer-top{display:grid;grid-template-columns:200px 1fr 1.3fr;gap:25px;align-items:start}.footer-top>p{font-size:10px;color:#8497ad;max-width:290px;margin:3px 0}.footer-links{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:10px 18px;font-size:10px;color:#a9b9cc}.footer-bottom{display:flex;justify-content:space-between;gap:18px;border-top:1px solid #1b293b;margin-top:27px;padding-top:15px;font-size:9px;color:#70839a}.legal-main{min-height:60vh;padding:65px 0 90px}.legal-main h1{font-size:clamp(34px,4vw,48px);letter-spacing:-1.5px}.legal-main .lead{font-size:16px;color:#a6b8cd;max-width:780px}.legal-main article{max-width:850px}.legal-main h2{font-size:21px;margin-top:34px}.legal-main p,.legal-main li{color:#b2c1d4;font-size:14px;line-height:1.85}.legal-main a{color:var(--mint);text-decoration:underline}.legal-card{border:1px solid var(--line);background:#0e1928;padding:22px;border-radius:14px;margin:24px 0}.legal-main label{display:block;font-size:12px;margin:12px 0 5px}.legal-main input,.legal-main textarea{width:100%;background:#07111e;border:1px solid #2b3d53;border-radius:8px;color:white;padding:12px}.legal-main textarea{min-height:130px}.form-note{color:#f5d08a!important;font-size:12px!important}
@media(max-width:900px){nav{gap:15px}.hero{grid-template-columns:1fr .8fr;gap:12px}.hero h1{font-size:52px}.calculator-shell{grid-template-columns:170px minmax(0,1fr)}.calc-main{padding:15px}.calc-sidebar{padding:15px 9px}.guide-grid{grid-template-columns:repeat(2,1fr)}.footer-top{grid-template-columns:1fr 1fr}.footer-links{grid-column:1/-1;justify-content:flex-start}}
@media(max-width:680px){.topbar{height:68px}.topbar nav{display:none;position:absolute;top:68px;left:0;right:0;background:#0b1422;padding:20px;flex-direction:column;border-bottom:1px solid var(--line)}.topbar nav.open{display:flex}.top-cta{margin-left:auto;margin-right:12px;padding:8px 10px;font-size:10px}.menu-toggle{display:block}.hero{grid-template-columns:1fr;padding-top:48px;padding-bottom:35px}.hero h1{font-size:48px;letter-spacing:-2.5px}.hero-visual{height:330px;margin-top:15px}.orbit-a{width:300px;height:240px}.orbit-b{height:310px}.stats{grid-template-columns:repeat(2,1fr);gap:18px}.stats div{padding:0;border:0}.section-heading{align-items:start;flex-direction:column}.status-pill{display:none}.calc-section,.content-section,.faq-section{padding-top:62px;padding-bottom:55px}.calculator-shell{grid-template-columns:1fr}.calc-sidebar{border-right:0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:12px}.calc-brand{grid-column:1/-1;padding:0 3px 7px}.mode{padding:9px 6px;gap:5px}.mode>span:first-child{width:20px;font-size:17px}.mode b{font-size:10px}.mode small,.sidebar-note{display:none}.calc-main{padding:12px}.keypad{gap:6px}.keypad button{min-height:42px;font-size:12px}.display input{font-size:16px}.calc-bottom{font-size:8px}.feature-strip{grid-template-columns:1fr}.feature-grid{grid-template-columns:1fr}.guide-grid{grid-template-columns:1fr}.guides-section{padding:60px 0}.cta-inner{align-items:flex-start;flex-direction:column}.footer-top{grid-template-columns:1fr}.footer-links{grid-column:auto;justify-content:flex-start}.footer-bottom{flex-direction:column}.wrap{width:min(100% - 28px,1160px)}}

/* Theme switcher and cross-device refinements */
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;gap:7px;flex-shrink:0;border:1px solid var(--line);border-radius:10px;padding:9px 11px;background:var(--panel);color:var(--text);font-size:11px;font-weight:750;cursor:pointer;min-height:38px;white-space:nowrap}
.theme-toggle:hover,.theme-toggle:focus-visible{border-color:var(--mint);outline-offset:3px}
.theme-icon{font-size:16px;line-height:1;color:var(--mint)}
html[data-theme="light"]{color-scheme:light;--bg:#f5f8fc;--panel:#ffffff;--panel2:#edf3f9;--line:#dce5ef;--text:#152338;--muted:#586b82;--mint:#087f70;--blue:#315fc5;--purple:#7654bd}
html[data-theme="light"] body{background:var(--bg);color:var(--text)}
html[data-theme="light"] .topbar{background:rgba(255,255,255,.94);border-color:#dce5ef}
html[data-theme="light"] nav{color:#42536a}
html[data-theme="light"] .top-cta{color:#087f70;border-color:#087f7044}
html[data-theme="light"] .hero-lede,html[data-theme="light"] .section-heading p,html[data-theme="light"] .cta-inner p{color:#53667d}
html[data-theme="light"] .trust-row,html[data-theme="light"] .stats span{color:#5f7187}
html[data-theme="light"] .mini-device{background:linear-gradient(145deg,#ffffff,#e8f0f8);border-color:#cbd8e7;box-shadow:0 24px 65px #28415b20,0 0 45px #087f7010}
html[data-theme="light"] .device-screen{background:#f8fbff;border-color:#c8d7e6}
html[data-theme="light"] .device-head,html[data-theme="light"] .screen-label{color:#60758d}
html[data-theme="light"] .screen-foot{color:#087f70}
html[data-theme="light"] .device-keys i{background:linear-gradient(#e9eff7,#dbe5f0);border-color:#c6d3e2}
html[data-theme="light"] .float-chip{background:#ffffffed;border-color:#d5e0eb;color:#087f70;box-shadow:0 12px 35px #22354a15}
html[data-theme="light"] .float-chip b{color:#263951}
html[data-theme="light"] .calculator-shell{background:#fff;border-color:#d3dfeb;box-shadow:0 24px 65px #29415c12}
html[data-theme="light"] .calc-sidebar{background:#edf3f9;border-color:#d7e2ed}
html[data-theme="light"] .mode{color:#526780}
html[data-theme="light"] .mode b{color:#243950}
html[data-theme="light"] .mode small,html[data-theme="light"] .calc-brand small{color:#657b93}
html[data-theme="light"] .mode.active{background:#087f7010;border-color:#087f7038}
html[data-theme="light"] .sidebar-note{background:#fff;border-color:#d7e2ed}
html[data-theme="light"] .sidebar-note p{color:#5e7188}
html[data-theme="light"] .calc-topline{color:#5a718b}
html[data-theme="light"] .tiny-toggle{background:#f3f7fb;color:#3e536b;border-color:#d4e0eb}
html[data-theme="light"] .display{background:#f8fbff;border-color:#d6e2ed}
html[data-theme="light"] .display label,html[data-theme="light"] .result-line span{color:#637991}
html[data-theme="light"] .display input{color:#14283f;border-color:#dbe5ef}
html[data-theme="light"] .result-line output{color:#087f70}
html[data-theme="light"] .keypad button{background:linear-gradient(145deg,#fff,#edf3f9);color:#243950;border-color:#d6e1ec}
html[data-theme="light"] .keypad button:nth-child(-n+5){color:#087f70;background:#e5f5f1}
html[data-theme="light"] .keypad .equals{background:#087f70;color:#fff;border-color:#087f70}
html[data-theme="light"] .calc-bottom{color:#657a91;border-color:#dce5ef}
html[data-theme="light"] .graph-panel,html[data-theme="light"] .history-panel{background:#f8fbff;border-color:#d7e2ed}
html[data-theme="light"] .graph-controls label{color:#087f70}
html[data-theme="light"] .graph-controls input{background:#fff;color:#172b42;border-color:#d4e0eb}
html[data-theme="light"] #graph-canvas{background:#fff;border-color:#d5e0eb}
html[data-theme="light"] .graph-foot,html[data-theme="light"] .microcopy{color:#5d7289}
html[data-theme="light"] .zoom-btn{background:#edf3f9;color:#2c435b;border-color:#d0dce8}
html[data-theme="light"] .history-panel li{color:#354b63;border-color:#dce5ef}
html[data-theme="light"] .info-card,html[data-theme="light"] .guide-card,html[data-theme="light"] .faq-list details,html[data-theme="light"] .legal-card{background:#fff;border-color:#dce5ef;color:#20344b}
html[data-theme="light"] .info-card p,html[data-theme="light"] .guide-card p,html[data-theme="light"] .faq-list details p,html[data-theme="light"] .legal-main article{color:#4f637a}
html[data-theme="light"] .info-card h3,html[data-theme="light"] .guide-card h3,html[data-theme="light"] .legal-main h1,html[data-theme="light"] .legal-main h2{color:#182b42}
html[data-theme="light"] .legal-main article a,html[data-theme="light"] .guide-card a,html[data-theme="light"] .info-card a{color:#087f70}
html[data-theme="light"] .footer{background:#eaf0f7;border-color:#d7e1ec}
html[data-theme="light"] .footer p,html[data-theme="light"] .footer-bottom{color:#5b6f86}
html[data-theme="light"] .footer-links a{color:#354b63}
html[data-theme="light"] .topbar nav.open{background:#fff;border-color:#dce5ef}
html[data-theme="light"] .legal-main input,html[data-theme="light"] .legal-main textarea{background:#fff;color:#172b42;border-color:#d3dfeb}
html[data-theme="light"] .status-pill{color:#526780}
html[data-theme="light"] .orbit{border-color:#315fc51c}
html[data-theme="light"] .orbit-b{border-color:#087f701c}

/* Tablet layout */
@media (min-width:681px) and (max-width:1024px){
  .topbar{padding-left:22px;padding-right:22px;gap:12px}
  .topbar nav{gap:13px;font-size:12px}
  .brand{font-size:15px}
  .brand small{font-size:7px;letter-spacing:1.5px}
  .top-cta{padding:9px 10px;font-size:11px}
  .theme-toggle{padding:8px 9px}
  .wrap{width:min(100% - 40px,1160px)}
  .hero{gap:20px;grid-template-columns:1fr .8fr}
  .hero h1{font-size:clamp(42px,5vw,56px);letter-spacing:-2.8px}
  .hero-visual{transform:scale(.92);transform-origin:center}
  .calculator-shell{grid-template-columns:180px minmax(0,1fr)}
  .calc-main{padding:18px}
  .keypad{gap:7px}
  .keypad button{min-height:44px}
  .feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
/* Small tablets and phones */
@media(max-width:680px){
  .topbar{padding:0 14px;gap:8px}
  .brand{font-size:14px;gap:7px}
  .brand-mark{width:33px;height:33px;border-radius:10px;font-size:20px}
  .brand small{font-size:7px;letter-spacing:1.1px}
  .theme-toggle{padding:7px 9px;min-height:36px;font-size:10px;gap:5px}
  .theme-icon{font-size:15px}
  .top-cta{display:none}
  .menu-toggle{margin-left:0;padding:7px;min-width:36px;min-height:36px;color:var(--text)}
  .topbar nav{top:68px;padding:16px 20px;gap:0;box-shadow:0 15px 25px #0002}
  .topbar nav a{padding:11px 0;border-bottom:1px solid var(--line)}
  .topbar nav a:last-child{border-bottom:0}
  .hero h1{font-size:clamp(38px,10vw,48px);letter-spacing:-2.2px}
  .hero-lede{font-size:15px}
  .hero-visual{max-width:440px;width:100%;margin-left:auto;margin-right:auto;overflow:hidden}
  .chip-one{right:0}.chip-two{left:0}
  .stats strong{font-size:20px}
  .calc-section,.content-section,.faq-section{padding-top:48px;padding-bottom:44px}
  .calculator-shell{border-radius:14px}
  .calc-sidebar{grid-template-columns:repeat(3,minmax(0,1fr))}
  .calc-main{padding:10px}
  .calc-topline{font-size:8px;letter-spacing:.8px}
  .tiny-toggle{padding:7px 8px}
  .display{padding:12px;margin-bottom:12px}
  .keypad{grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}
  .keypad button{min-width:0;min-height:44px;padding:4px 1px;font-size:clamp(11px,3vw,13px);border-radius:7px}
  .keypad .equals{grid-column:span 4}
  .graph-controls{flex-wrap:wrap}
  .graph-controls label{flex:0 0 auto}
  .graph-controls input{flex:1 1 60%;width:60%}
  .graph-controls .btn{flex:1 0 100%}
  .graph-foot{flex-wrap:wrap}
  .legal-main{padding-top:38px;padding-bottom:44px}
  .legal-main h1{font-size:clamp(32px,8vw,44px);letter-spacing:-1.8px}
  .legal-main article h2{font-size:22px}
  .legal-card{padding:18px}
  .footer{padding-top:28px}
  .footer-links{gap:12px 18px}
}
@media(max-width:380px){
  .theme-label{display:none}
  .theme-toggle{width:36px;padding:6px}
  .hero h1{font-size:37px}
  .hero-visual{height:290px}
  .mini-device{width:270px}
  .float-chip{padding:8px 9px;font-size:10px}
  .keypad button{min-height:41px;font-size:11px}
  .calc-topline>div{gap:4px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}


/* Accessibility and visual refresh: consistent typography, readable controls, true light theme */
:root{
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
html{font-size:16px}
body{font-family:var(--font-body);font-size:16px;line-height:1.7}
button,input,textarea,select{font:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
nav{font-size:14px}
.hero-lede{font-size:18px;line-height:1.75}
.eyebrow{font-size:11px;letter-spacing:1.7px}
.trust-row{font-size:12px}
.stats span{font-size:13px}
.section-heading p,.cta-inner p{font-size:15px;line-height:1.7}
.btn{font-size:14px;min-height:46px}
.top-cta{font-size:13px}
.theme-toggle{font-size:13px;min-height:42px;padding:10px 13px}
.calc-topline{font-size:12px}
.tiny-toggle{font-size:11px;padding:8px 11px}
.display label,.result-line span{font-size:11px}
.display input{font-size:clamp(18px,2vw,22px);min-height:46px}
.keypad button{font-size:15px;min-height:48px}
.keypad .equals{font-size:14px}
.calc-bottom{font-size:11px}
.mode b{font-size:13px}
.mode small{font-size:11px}
.calc-brand small{font-size:10px}
.sidebar-note b{font-size:12px}
.sidebar-note p{font-size:11px}
.graph-controls label{font-size:14px}
.graph-controls input{font-size:14px;min-height:42px}
.graph-foot{font-size:12px}
.zoom-btn{font-size:14px;min-width:34px;min-height:34px}
.microcopy{font-size:12px}
.history-panel h3{font-size:16px}
.history-panel li{font-size:13px}
.feature-strip b{font-size:14px}
.feature-strip small{font-size:12px}
.info-card h3{font-size:19px}
.info-card p,.guide-card p{font-size:14px;line-height:1.8}
.info-card>a,.guide-card>a{font-size:13px}
.guide-number{font-size:10px}
.guide-card h3{font-size:17px}
summary{font-size:16px}
details p{font-size:14px}
.cta-inner h2{font-size:clamp(26px,3vw,34px)}
.footer-top>p{font-size:12px}
.footer-links{font-size:12px}
.footer-bottom{font-size:11px}
.legal-main .lead{font-size:18px;line-height:1.7}
.legal-main h2{font-size:24px}
.legal-main p,.legal-main li{font-size:16px}
.legal-main label{font-size:14px;font-weight:650}
.legal-main input,.legal-main textarea{font-size:16px;min-height:46px}
.form-note{font-size:13px!important}
html[data-theme="light"]{
  color-scheme:light;
  --bg:#f4f7fb;--panel:#ffffff;--panel2:#edf2f8;--line:#d9e2ed;
  --text:#17263a;--muted:#52657b;--mint:#087e70;--blue:#285fc7;--purple:#7553bd;
}
html[data-theme="light"] .topbar{background:rgba(255,255,255,.96);border-color:#d9e2ed;box-shadow:0 4px 18px #20365008}
html[data-theme="light"] nav{color:#344960}
html[data-theme="light"] .menu-toggle{color:#17263a}
html[data-theme="light"] .hero-lede{color:#4d6178}
html[data-theme="light"] .trust-row,html[data-theme="light"] .stats span{color:#52657b}
html[data-theme="light"] .calc-section,html[data-theme="light"] .content-section,html[data-theme="light"] .faq-section{border-color:#d9e2ed}
html[data-theme="light"] .calculator-shell{background:#fff;border-color:#d4dfeb;box-shadow:0 22px 55px #20365012}
html[data-theme="light"] .calc-sidebar{background:#edf2f8;border-color:#d4dfeb}
html[data-theme="light"] .mode{color:#354a61}
html[data-theme="light"] .mode b{color:#20344b}
html[data-theme="light"] .mode small,html[data-theme="light"] .calc-brand small{color:#5b7087}
html[data-theme="light"] .sidebar-note{background:#fff;border-color:#d5e0eb}
html[data-theme="light"] .sidebar-note p{color:#52677e}
html[data-theme="light"] .calc-topline{color:#536980}
html[data-theme="light"] .tiny-toggle{background:#f3f7fb;color:#354b63;border-color:#d2deea}
html[data-theme="light"] .display{background:#f8fbff;border-color:#d4dfeb}
html[data-theme="light"] .display label,html[data-theme="light"] .result-line span{color:#526980}
html[data-theme="light"] .display input{color:#172b42;border-color:#d5e0eb}
html[data-theme="light"] .result-line output{color:#087e70}
html[data-theme="light"] .keypad button{background:linear-gradient(145deg,#fff,#edf3f9);color:#243950;border-color:#d4dfeb}
html[data-theme="light"] .keypad button:nth-child(-n+5){color:#087e70;background:#e4f5f1}
html[data-theme="light"] .keypad .equals,html[data-theme="light"] .btn.primary{background:#087e70;color:#fff;border-color:#087e70}
html[data-theme="light"] .calc-bottom{color:#52677e;border-color:#d9e2ed}
html[data-theme="light"] .graph-panel,html[data-theme="light"] .history-panel{background:#f8fbff;border-color:#d4dfeb}
html[data-theme="light"] .graph-controls label{color:#087e70}
html[data-theme="light"] .graph-controls input{background:#fff;color:#172b42;border-color:#d2deea}
html[data-theme="light"] #graph-canvas{background:#fff;border-color:#d4dfeb}
html[data-theme="light"] .graph-foot,html[data-theme="light"] .microcopy{color:#52677e}
html[data-theme="light"] .zoom-btn{background:#edf3f9;color:#2c435b;border-color:#d0dce8}
html[data-theme="light"] .history-panel li{color:#354b63;border-color:#d9e2ed}
html[data-theme="light"] .feature-strip>div{background:#fff;border-color:#d9e2ed}
html[data-theme="light"] .feature-strip small{color:#52677e}
html[data-theme="light"] .info-card,html[data-theme="light"] .guide-card,html[data-theme="light"] .faq-list details,html[data-theme="light"] .legal-card{background:#fff;border-color:#d9e2ed;color:#20344b}
html[data-theme="light"] .info-card p,html[data-theme="light"] .guide-card p,html[data-theme="light"] .faq-list details p,html[data-theme="light"] .legal-main article{color:#4b6077}
html[data-theme="light"] .info-card h3,html[data-theme="light"] .guide-card h3,html[data-theme="light"] .legal-main h1,html[data-theme="light"] .legal-main h2{color:#172b42}
html[data-theme="light"] .info-card code{background:#e9f4f3;color:#075e55}
html[data-theme="light"] .legal-main .lead{color:#4b6077}
html[data-theme="light"] .legal-main p,html[data-theme="light"] .legal-main li{color:#354b63}
html[data-theme="light"] .legal-main input,html[data-theme="light"] .legal-main textarea{background:#fff;color:#172b42;border-color:#cbd8e6}
html[data-theme="light"] .footer{background:#e9eff6;border-color:#d4dfeb}
html[data-theme="light"] .footer-top>p,html[data-theme="light"] .footer-bottom{color:#52677e}
html[data-theme="light"] .footer-links a{color:#354b63}
html[data-theme="light"] .topbar nav.open{background:#fff;border-color:#d9e2ed}
html[data-theme="light"] .guides-section{background:#edf2f8;border-color:#d9e2ed}
html[data-theme="light"] .bottom-cta{background:radial-gradient(ellipse at 10% 0%,#087e7010,transparent 45%),#edf3f9;border-color:#d9e2ed}
html[data-theme="light"] .btn.ghost{color:#243950;border-color:#cbd8e6;background:#fff}
html[data-theme="light"] .status-pill{color:#52677e}
@media(max-width:680px){
 body{font-size:16px}
 .hero-lede{font-size:16px}
 .trust-row{font-size:11px}
 .calc-topline{font-size:10px;letter-spacing:.5px}
 .keypad button{font-size:14px;min-height:46px}
 .display input{font-size:17px}
 .calc-bottom{font-size:10px}
 .mode b{font-size:12px}
 .mode small{font-size:10px}
 .section-heading p,.cta-inner p{font-size:14px}
 .info-card p,.guide-card p{font-size:14px}
 .footer-links{font-size:12px}
 .footer-bottom{font-size:10px}
}

.history-tools{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px}.history-reuse{padding:0;border:0;background:transparent;color:inherit;text-align:left;cursor:pointer;font:inherit;overflow-wrap:anywhere}.history-reuse:hover{color:var(--mint);text-decoration:underline}.history-panel li{align-items:center}.keypad button:active,.zoom-btn:active,.theme-toggle:active{transform:translateY(1px)}

/* Contact form bot trap: hidden from people and keyboard navigation */
.contact-honeypot{position:absolute!important;left:-10000px!important;width:1px!important;height:1px!important;overflow:hidden!important;}