:root{
  --navy:#0c2f57;--navy-2:#061d39;--navy-3:#123e6d;--gold:#e7ad39;--gold-2:#f6c65f;
  --ink:#10213a;--muted:#5d6a7e;--bg:#f6f8fb;--card:#fff;--line:#dfe5ed;--success:#0a7a55;--danger:#b42318;
  --radius:18px;--shadow:0 18px 50px rgba(10,37,69,.12);--max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);line-height:1.55}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
.container{width:min(var(--max),calc(100% - 36px));margin-inline:auto}
.site-header{background:linear-gradient(180deg,var(--navy-2),var(--navy));border-bottom:1px solid rgba(255,255,255,.12);position:relative;z-index:10}
.header-inner{min-height:74px;display:flex;align-items:center;justify-content:center;gap:28px;position:relative}
.header-inner.internal{justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:11px;color:#fff;font-size:27px;font-weight:800;letter-spacing:-.7px;white-space:nowrap}
.brand img{width:44px;height:40px;object-fit:cover;border-radius:10px}
.header-search{width:min(540px,52vw);position:relative}
.header-search input,.hero-search input{width:100%;border:1px solid rgba(255,255,255,.2);background:#fff;color:var(--ink);outline:none}
.header-search input{height:44px;border-radius:12px;padding:0 46px 0 50px}
.hero{position:relative;overflow:hidden;background:radial-gradient(circle at 50% 20%,#174d86 0,#0b3566 36%,#061f40 78%);color:#fff;padding:44px 0 94px;text-align:center}
.hero:before,.hero:after{content:"";position:absolute;border:1px solid rgba(255,255,255,.06);border-radius:50%;width:740px;height:240px;transform:rotate(9deg)}
.hero:before{left:-260px;bottom:15px}.hero:after{right:-260px;top:100px}
.hero h1{position:relative;font-size:clamp(38px,5vw,62px);line-height:1.03;letter-spacing:-2.3px;margin:0 auto 14px;max-width:780px}
.hero h1 span{color:var(--gold-2)}
.hero p{position:relative;margin:0 auto 27px;font-size:clamp(15px,2vw,19px);opacity:.9}
.hero-search{position:relative;width:min(670px,100%);margin:0 auto}
.hero-search input{height:60px;border-radius:13px;padding:0 54px 0 54px;box-shadow:0 12px 34px rgba(0,0,0,.24);font-size:16px}
.search-icon{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;font-size:0;pointer-events:none;z-index:2}
.search-icon:before{content:"";position:absolute;width:11px;height:11px;border:2px solid var(--navy);border-radius:50%;left:1px;top:1px}
.search-icon:after{content:"";position:absolute;width:8px;height:2px;background:var(--navy);border-radius:2px;transform:rotate(45deg);transform-origin:left center;left:12px;top:13px}
.search-results{display:none;position:absolute;top:calc(100% + 8px);left:0;right:0;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow);max-height:360px;overflow:auto;text-align:left;z-index:100}
.search-results.open{display:block}
.search-results a{display:flex;justify-content:space-between;gap:15px;padding:12px 15px;border-bottom:1px solid #edf1f5}
.search-results a:last-child{border-bottom:0}
.search-results a:hover,.search-results a:focus{background:#f6f8fb}
.search-results small{color:var(--muted)}
.home-main{margin-top:-56px;position:relative;z-index:2;padding-bottom:70px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.feature-card{padding:28px;margin-bottom:26px}
.feature-head,.tool-title-row{display:flex;align-items:center;gap:16px;margin-bottom:22px}
.icon-tile{width:58px;height:58px;border-radius:14px;background:linear-gradient(145deg,var(--navy-3),var(--navy-2));color:var(--gold-2);display:grid;place-items:center;font-weight:800;font-size:27px;flex:0 0 auto}
.feature-head h2,.tool-title-row h1{margin:0;line-height:1.15}
.feature-head p,.tool-title-row p{margin:5px 0 0;color:var(--muted)}
.feature-badge{margin-left:auto;color:#b77913;font-size:14px}
.calc-shell{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.calc-tabs{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid var(--line)}
.calc-tab{border:0;background:#fff;padding:14px 10px;color:var(--muted);font-weight:650;border-bottom:2px solid transparent}
.calc-tab.active{color:var(--navy);border-color:var(--gold)}
.calc-panel{padding:22px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}
.form-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.field{display:grid;gap:7px;text-align:left}
.field label{font-size:13px;font-weight:700;color:#31415a}
.input-wrap{position:relative}
.input-wrap input,.field select,.field textarea,.tool-input{width:100%;border:1px solid #cfd8e3;border-radius:10px;background:#fff;color:var(--ink);outline:none;transition:.2s}
.input-wrap input,.field select,.tool-input{height:46px;padding:0 13px}
.field textarea{min-height:150px;padding:12px;resize:vertical}
.input-wrap input.has-unit{padding-right:62px}
.input-wrap input.has-unit-prefix{padding-left:34px}
.unit{position:absolute;right:13px;top:50%;transform:translateY(-50%);color:#68758a;font-size:13px;pointer-events:none;white-space:nowrap}
.unit.prefix{left:13px;right:auto;color:#53647b;font-weight:700}
.calc-formula{margin-bottom:16px;padding:11px 13px;border:1px solid #e3e9f0;border-radius:10px;background:#f8fafc;color:#53647b;font-size:13px;text-align:left}
.calc-formula strong{color:var(--navy)}
input:focus,select:focus,textarea:focus{border-color:#8aaccd;box-shadow:0 0 0 3px rgba(22,58,95,.08)}
.actions{display:flex;gap:10px;justify-content:center;margin-top:20px;flex-wrap:wrap}
.btn{min-height:45px;border:1px solid transparent;border-radius:10px;padding:0 22px;font-weight:750;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn-primary{background:linear-gradient(180deg,#103f73,#072a52);color:#fff;box-shadow:0 7px 18px rgba(6,42,82,.16)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-secondary{background:#fff;border-color:#ccd6e2;color:var(--navy)}
.result-box{margin-top:20px;border-top:1px solid var(--line);padding-top:18px;display:grid;grid-template-columns:180px 1fr;align-items:start;gap:14px}
.result-box strong{font-size:14px}
.result-content{min-height:48px;border:1px solid #dbe3ec;background:#f9fbfd;border-radius:10px;padding:12px 14px;overflow-wrap:anywhere}
.result-content.empty{color:#8793a5}
.result-primary{font-size:24px;font-weight:800;color:var(--navy)}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:9px}
.result-item{padding:10px 12px;border-radius:9px;background:#fff;border:1px solid #e4e9ef}
.result-item span{display:block;color:var(--muted);font-size:12px}.result-item b{font-size:16px}
.helper{display:flex;gap:18px;align-items:flex-start;padding:0 32px;margin:22px 0 34px}
.helper-icon{width:52px;height:52px;border-radius:50%;background:#fff8e9;color:#c78913;display:grid;place-items:center;font-size:25px;flex:0 0 auto}
.helper h3{margin:0 0 6px;font-size:17px}.helper p{margin:3px 0;color:var(--muted)}
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:22px 0 34px}
.category-card{padding:26px;text-align:center;transition:.2s;box-shadow:none}
.category-card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(10,37,69,.09)}
.category-card .round{width:56px;height:56px;border-radius:50%;margin:0 auto 13px;background:var(--navy);color:var(--gold);display:grid;place-items:center;font-size:24px}
.category-card h3{margin:0 0 7px;font-size:20px}.category-card p{margin:0;color:var(--muted);font-size:14px}
.directory{padding:32px}
.section-title{text-align:center;margin:0 0 26px;font-size:26px;letter-spacing:-.5px}
.section-title:before,.section-title:after{content:"";display:inline-block;width:55px;height:1px;background:var(--gold);vertical-align:middle;margin:0 17px}
.directory-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:30px}
.directory-group h3{font-size:15px;margin:0 0 10px;color:var(--navy)}
.tool-link{display:block;padding:7px 0;border-bottom:1px solid #edf0f4;font-size:13px;color:#35445c}
.tool-link:hover{color:#b77913}
.more-link{display:inline-block;margin-top:10px;color:#a66b00;font-weight:700;font-size:13px}
.site-footer{background:var(--navy-2);color:#d9e3ee;padding:32px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:34px}
.footer-brand .brand{margin-bottom:10px}.footer-brand p{font-size:13px;color:#aebdcd;max-width:280px}
.footer-col h3{color:#fff;margin:4px 0 10px;font-size:14px}
.footer-col a{display:block;font-size:13px;color:#b9c7d5;padding:3px 0}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:24px;padding-top:18px;font-size:12px;color:#8fa3b8;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.page-hero{background:linear-gradient(180deg,var(--navy-2),var(--navy));color:#fff;padding:46px 0 64px}
.breadcrumbs{font-size:13px;color:#b9cbdd;margin-bottom:18px}.breadcrumbs a:hover{color:#fff}
.page-hero h1{font-size:clamp(34px,5vw,52px);line-height:1.06;margin:0 0 10px;letter-spacing:-1.5px}
.page-hero p{margin:0;max-width:720px;color:#d6e0ea}
.page-main{margin-top:-34px;padding-bottom:70px;position:relative}
.tool-card{padding:28px}
.tool-layout{display:grid;grid-template-columns:minmax(0,760px) 1fr;gap:24px;align-items:start}
.side-card{padding:20px;position:sticky;top:20px}
.side-card h3{margin:0 0 10px}.side-card a{display:block;padding:8px 0;border-bottom:1px solid #edf1f5;font-size:13px}
.explain-card{margin-top:22px;padding:25px;box-shadow:none}
.explain-card h2{font-size:20px;margin:0 0 8px}.explain-card p{color:var(--muted);margin:7px 0}
.notice{padding:12px 14px;border-radius:10px;background:#fff8e8;border:1px solid #f2d89f;color:#745414;font-size:13px;margin-top:15px}
.error{padding:10px 12px;border-radius:9px;background:#fff1f0;border:1px solid #f1c5c1;color:var(--danger);font-size:13px;margin-top:12px}
.success{color:var(--success)}
.category-page{padding:40px 0 70px}
.category-intro{margin-bottom:25px}.category-intro h1{font-size:40px;margin:0 0 8px}.category-intro p{color:var(--muted);max-width:720px}
.tool-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.tool-nav-card{padding:20px;box-shadow:none;transition:.2s}.tool-nav-card:hover{box-shadow:0 10px 30px rgba(10,37,69,.08);transform:translateY(-2px)}
.tool-nav-card h2{font-size:17px;margin:0 0 6px}.tool-nav-card p{font-size:13px;color:var(--muted);margin:0 0 10px}
.tool-nav-card span{font-size:12px;color:#a66b00;font-weight:700}
.legal{padding:44px 0 70px}.legal article{max-width:860px;margin:auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;box-shadow:0 10px 30px rgba(10,37,69,.06)}
.legal h1{font-size:38px;margin:0 0 8px}.legal .updated{color:var(--muted);font-size:13px;margin-bottom:28px}.legal h2{font-size:21px;margin-top:30px}.legal h3{font-size:16px;margin-top:22px}.legal p,.legal li{color:#47566c}
.legal a{color:#0d5ba6;text-decoration:underline}.legal ul{padding-left:20px}
.contact-panel{display:grid;gap:12px;background:#f8fafc;border:1px solid var(--line);border-radius:13px;padding:18px;margin-top:18px}
.codebox{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;background:#071e39;color:#eaf2f9;padding:15px;border-radius:10px;overflow:auto}
.tool-workspace{min-height:180px}
.textarea-large{min-height:220px;width:100%;border:1px solid #cfd8e3;border-radius:10px;padding:12px;resize:vertical}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:15px}
.preview-box{border:1px dashed #c7d2df;border-radius:12px;padding:14px;min-height:140px;background:#fafcff;display:grid;place-items:center;overflow:auto}
.preview-box canvas,.preview-box img{max-width:100%;height:auto}
.download-link{display:none;margin-top:12px}
.download-link.ready{display:inline-flex}
.color-swatch{height:70px;border-radius:10px;border:1px solid #d9e0e8;margin-top:10px}
.palette{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:15px}
.palette button{border:0;border-radius:10px;min-height:95px;padding:55px 4px 7px;font-weight:800;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08)}
.scientific-display{width:100%;height:58px;border:1px solid #cfd8e3;border-radius:11px;padding:0 15px;font-size:22px;text-align:right;background:#f9fbfd}
.sci-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}.sci-grid button{min-height:45px;border:1px solid #d7e0e9;background:#fff;border-radius:9px;color:var(--navy);font-weight:700}.sci-grid button.primary{background:var(--navy);color:#fff}
.shape-fields{margin-top:16px}
.countdown-display{font-size:clamp(26px,5vw,42px);font-weight:850;color:var(--navy);text-align:center;padding:20px 0}
.ad-slot[hidden]{display:none!important}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.not-found{text-align:center;padding:80px 0}.not-found .code{font-size:100px;line-height:1;color:var(--gold);font-weight:900}.not-found h1{font-size:38px;margin:8px 0}.not-found p{color:var(--muted)}
@media(max-width:900px){
  .directory-grid{grid-template-columns:repeat(2,1fr)}
  .tool-card-grid{grid-template-columns:repeat(2,1fr)}
  .tool-layout{grid-template-columns:1fr}.side-card{position:static}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .container{width:min(100% - 24px,var(--max))}
  .header-inner{min-height:66px}.header-inner.internal{gap:12px;align-items:center}.brand{font-size:23px}.brand img{width:39px;height:35px}
  .header-search{width:48px;height:44px;flex:0 0 auto}.header-search input{width:48px;padding:0;color:transparent;cursor:pointer}.header-search .search-icon{left:14px}.header-search:focus-within{position:absolute;left:0;right:0;width:auto;z-index:30}.header-search:focus-within input{width:100%;color:var(--ink);padding:0 44px 0 48px;cursor:text}.header-search:focus-within .search-icon{left:16px}.header-search:focus-within .search-results{top:calc(100% + 8px)}.header-search input::placeholder{color:transparent}.header-search:focus-within input::placeholder{color:#8793a5}
  .hero{padding:38px 0 86px}.hero h1{font-size:39px;letter-spacing:-1.3px}.hero p{font-size:15px;padding:0 8px}.hero-search input{height:56px;font-size:15px}
  .home-main{margin-top:-48px}.feature-card,.tool-card{padding:18px}.feature-head{align-items:flex-start}.feature-badge{display:none}
  .calc-tabs{grid-template-columns:1fr}.calc-tab{border-bottom:1px solid var(--line);text-align:left;padding:12px 14px}.calc-tab.active{border-left:3px solid var(--gold);border-bottom-color:var(--line)}
  .calc-panel{padding:16px}.form-grid,.form-grid.three,.two-col{grid-template-columns:1fr}.result-box{grid-template-columns:1fr}.actions .btn{flex:1}
  .helper{padding:0 6px;gap:12px}.helper-icon{width:44px;height:44px}
  .category-grid{grid-template-columns:1fr}.category-card{padding:22px}
  .directory{padding:22px 18px}.directory-grid{grid-template-columns:1fr}.section-title{font-size:23px}.section-title:before,.section-title:after{width:25px;margin:0 7px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px 15px}.footer-brand{grid-column:1/-1}
  .page-hero{padding:34px 0 55px}.page-hero h1{font-size:36px}.page-main{margin-top:-28px}.tool-title-row{align-items:flex-start}
  .tool-card-grid{grid-template-columns:1fr}.legal{padding:26px 0 50px}.legal article{padding:24px 19px}.legal h1{font-size:32px}
  .palette{grid-template-columns:1fr 1fr}.sci-grid{gap:6px}.sci-grid button{min-height:43px;padding:0}
}

@media(max-width:440px){
  .footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}
  .feature-head{gap:11px}.icon-tile{width:50px;height:50px;font-size:23px}
  .page-hero h1{font-size:32px}
}