/*
Theme Name: Ramven Simple
Theme URI: https://ramven.com
Author: Ramven
Description: A clean, simple engineering knowledge theme for Ramven with four primary navigation items: Home, Articles, Tools and About.
Version: 5.1.0
License: GNU General Public License v2 or later
Text Domain: ramven
Tags: blog, engineering, water-treatment, simple, responsive
*/
:root{
  --ink:#102733; --muted:#5f737d; --blue:#096c8f; --blue-dark:#07536d;
  --aqua:#eaf6f9; --line:#dce8ec; --surface:#fff; --bg:#f7fafb;
  --radius:14px; --shadow:0 12px 30px rgba(16,39,51,.07);
  --body:'DM Sans',Arial,sans-serif; --display:'Source Serif 4',Georgia,serif;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased} a{color:inherit;text-decoration:none} img{max-width:100%;height:auto;display:block}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.site-header-inner{max-width:1160px;margin:auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}.site-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px}.site-logo{max-width:42px;max-height:42px;object-fit:contain}.brand-mark{width:38px;height:38px;border-radius:11px;background:var(--blue);color:#fff;display:grid;place-items:center;font-family:var(--display);font-weight:700}.brand-text{letter-spacing:.2px}.simple-nav{display:flex;align-items:center;gap:6px}.simple-nav a{padding:8px 13px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600}.simple-nav a:hover,.simple-nav a.active{background:var(--aqua);color:var(--blue-dark)}
.menu-toggle{display:none;border:0;background:transparent;padding:7px;cursor:pointer}.menu-toggle span{display:block;width:23px;height:2px;background:var(--ink);margin:5px 0;border-radius:2px}
.site-main{min-height:calc(100vh - 145px)}.simple-container{max-width:1080px;margin:0 auto;padding-left:24px;padding-right:24px}
.hero{padding-top:92px;padding-bottom:86px;max-width:900px;text-align:center}.hero-kicker,.section-kicker{display:block;color:var(--blue);font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:12px}.hero h1{font:700 clamp(48px,8vw,82px)/1 var(--display);margin:0 0 18px}.hero-copy{font-size:20px;line-height:1.6;color:var(--muted);max-width:720px;margin:0 auto}.hero-actions{margin-top:30px;display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.button{display:inline-flex;padding:12px 20px;border-radius:10px;font-weight:700;font-size:14px}.button-primary{background:var(--blue);color:white}.button-primary:hover{background:var(--blue-dark)}.button-secondary{background:white;border:1px solid var(--line);color:var(--ink)}
.home-section{padding-top:64px;padding-bottom:72px}.home-section-soft{background:var(--aqua)}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:26px}.section-heading h2,.about-strip h2,.page-top h1{font:700 36px/1.15 var(--display);margin:0}.section-heading>a{color:var(--blue);font-size:14px;font-weight:700}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.content-card,.list-card,.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 2px 10px rgba(16,39,51,.025)}.content-card{padding:24px;display:flex;flex-direction:column;min-height:250px}.card-meta{display:flex;gap:10px;justify-content:space-between;color:var(--muted);font-size:12px;margin-bottom:14px}.card-meta span:first-child{color:var(--blue);font-weight:700}.content-card h3,.list-card h2{font:700 25px/1.25 var(--display);margin:0 0 12px}.content-card p,.list-card p{color:var(--muted);font-size:14px;margin:0 0 20px}.text-link{margin-top:auto;color:var(--blue);font-size:14px;font-weight:700}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.tool-card{padding:22px;background:#fff;display:grid;gap:6px;transition:.2s ease}.tool-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.tool-card span{font-size:12px;color:var(--blue);font-weight:700}.tool-card strong{font-family:var(--display);font-size:21px}.tool-card small{color:var(--muted)}
.about-strip{padding-top:70px;padding-bottom:80px;display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center}.about-strip p{color:var(--muted);font-size:16px}.about-strip a{color:var(--blue);font-weight:700}
.page-top{padding-top:70px;padding-bottom:30px}.page-top h1{font-size:48px;margin-bottom:12px}.page-top p{margin:0;color:var(--muted);max-width:700px}.article-list{padding-bottom:70px;max-width:820px}.list-card{padding:26px;margin-bottom:16px}.list-card h2{font-size:30px}.pagination{display:flex;gap:8px;flex-wrap:wrap;margin-top:28px}.pagination a,.pagination span{padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:13px}.pagination .current{background:var(--blue);color:white;border-color:var(--blue)}
.article-container{max-width:780px;margin:0 auto;padding:64px 24px 80px}.back-link{display:inline-block;color:var(--blue);font-size:14px;font-weight:700;margin-bottom:36px}.article-header{margin-bottom:28px}.article-meta{display:flex;gap:9px;color:var(--muted);font-size:13px;margin-bottom:14px}.article-meta span:first-child{color:var(--blue);font-weight:700}.article-header h1{font:700 clamp(38px,7vw,60px)/1.07 var(--display);margin:0}.featured-image{border-radius:var(--radius);overflow:hidden;margin-bottom:34px}.article-content,.page-content-wrap{font-size:17px;line-height:1.8;color:#304852}.article-content h2,.article-content h3,.page-content-wrap h2,.page-content-wrap h3{font-family:var(--display);color:var(--ink);line-height:1.25;margin-top:38px}.article-content h2,.page-content-wrap h2{font-size:31px}.article-content h3,.page-content-wrap h3{font-size:24px}.article-content p,.page-content-wrap p{margin:0 0 20px}.article-content a,.page-content-wrap a{color:var(--blue);text-decoration:underline}.article-content ul,.article-content ol,.page-content-wrap ul,.page-content-wrap ol{padding-left:24px}.article-content blockquote,.page-content-wrap blockquote{border-left:4px solid var(--blue);background:var(--aqua);padding:15px 20px;margin:26px 0;border-radius:0 8px 8px 0}.page-content-wrap{max-width:900px;margin:0 auto;padding:10px 24px 80px}.page-content-wrap .elementor{font-size:initial}
.site-footer{border-top:1px solid var(--line);background:#fff}.site-footer-inner{max-width:1080px;margin:auto;padding:26px 24px;display:flex;justify-content:space-between;align-items:center;gap:24px;color:var(--muted);font-size:13px}.site-footer-inner div{display:grid;gap:2px}.site-footer-inner strong{color:var(--ink);font-size:14px}.site-footer p{margin:0}
.search-form{display:flex;gap:8px;max-width:500px;margin:0 auto 30px;padding:0 24px}.search-form input{flex:1;padding:11px 13px;border:1px solid var(--line);border-radius:9px}.search-form button{border:0;border-radius:9px;background:var(--blue);color:#fff;padding:10px 16px;font-weight:700}.resources-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.resource-card{border:1px solid var(--line);background:#fff;border-radius:var(--radius);padding:22px}.contact-grid{display:grid;grid-template-columns:1fr 320px;gap:30px}.form-input,.form-textarea{width:100%;padding:11px;border:1px solid var(--line);border-radius:8px}.form-group{margin-bottom:16px}.btn-send,.download-btn,.buy-button{background:var(--blue);color:#fff;border:0;border-radius:8px;padding:10px 16px;font-weight:700}.contact-info-card{background:var(--ink);color:#fff;border-radius:var(--radius);padding:24px}
@media(max-width:800px){.site-header-inner{padding:12px 18px}.menu-toggle{display:block}.simple-nav{display:none;position:absolute;top:64px;left:12px;right:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.simple-nav.open{display:flex}.simple-nav a{padding:11px 12px}.hero{padding-top:64px;padding-bottom:60px}.hero-copy{font-size:17px}.card-grid,.tool-grid,.about-strip,.contact-grid{grid-template-columns:1fr}.about-strip{gap:24px}.section-heading{align-items:start}.page-top h1{font-size:40px}.site-footer-inner{flex-direction:column;align-items:flex-start}}

/* Tools page — v5 */
.tools-library{padding-bottom:42px}.tools-library-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:16px}.tool-feature-card,.tool-coming-card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:26px;display:flex;gap:18px;align-items:flex-start}.tool-feature-card{box-shadow:0 10px 30px rgba(12,43,55,.06)}.tool-feature-number{font-size:12px;font-weight:800;color:var(--blue);letter-spacing:.08em;padding-top:4px}.tool-feature-card h2,.tool-coming-card h2{font-size:25px;margin:0 0 8px}.tool-feature-card p,.tool-coming-card p{color:var(--muted);margin:0 0 20px;line-height:1.6}.tool-coming-card h2{font-size:20px}.ramven-calculator-section{padding-top:60px;padding-bottom:68px}.calculator-heading{margin-bottom:22px}.ramven-calculator{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:22px;align-items:start}.calculator-inputs,.calculator-results{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}.calculator-inputs label{display:block;font-size:14px;font-weight:700;color:var(--ink);margin-bottom:14px}.calculator-inputs label span{float:right;color:var(--muted);font-size:12px;font-weight:600}.calculator-inputs input{width:100%;box-sizing:border-box;margin-top:7px;padding:11px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff}.calculator-inputs input:focus{outline:2px solid rgba(17,130,164,.18);border-color:var(--blue)}.calculator-inputs .button{width:100%;margin-top:4px}.calculator-results>div{display:flex;justify-content:space-between;gap:18px;padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}.calculator-results>div:last-child{border-bottom:0}.calculator-results span{color:var(--muted)}.calculator-results strong{text-align:right;color:var(--ink)}.calculator-results .pump-result{margin-top:6px;padding:16px 14px;border:0;border-radius:9px;background:var(--aqua)}.calculator-results .pump-result strong{color:var(--blue)}.calculator-note{font-size:12px;line-height:1.6;color:var(--muted);margin:16px 0 0}.tools-extra-content{padding-top:50px}
@media(max-width:850px){.tools-library-grid{grid-template-columns:1fr}.ramven-calculator{grid-template-columns:1fr}.tool-feature-card,.tool-coming-card{padding:20px}}


/* Ramven v5 — books, about and expanded tools */
.tool-grid-four{grid-template-columns:repeat(4,1fr)}
.section-intro{max-width:760px;color:var(--muted);margin:-8px 0 28px}
.books-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.book-card{border:1px solid var(--line);background:#fff;border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;min-height:210px}
.book-card h3{font:700 23px/1.3 var(--display);margin:10px 0 20px}
.book-topic{font-size:12px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:.06em}
.book-card .text-link{margin-top:auto}
.books-grid-home .book-card{min-height:225px}

.about-hero{padding-top:76px;padding-bottom:70px;display:grid;grid-template-columns:minmax(0,1.45fr) minmax(270px,.65fr);gap:60px;align-items:center}
.about-hero h1{font:700 clamp(42px,6vw,64px)/1.05 var(--display);margin:0 0 20px}
.about-lead{font-size:20px;color:#304852;line-height:1.65;margin:0 0 16px}
.about-hero p:not(.about-lead){color:var(--muted);max-width:760px}
.about-actions{justify-content:flex-start;margin-top:26px}
.about-summary-card{background:var(--ink);color:#fff;border-radius:var(--radius);padding:28px;display:grid;gap:10px;box-shadow:var(--shadow)}
.about-summary-card span{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#9bd6e6;margin-bottom:4px}
.about-summary-card strong{font-size:16px;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.12)}
.about-summary-card strong:last-child{border-bottom:0}
.about-values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.about-values-grid article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.about-values-grid article>span{font-size:12px;color:var(--blue);font-weight:800}
.about-values-grid h3{font:700 24px/1.2 var(--display);margin:8px 0 10px}
.about-values-grid p{margin:0;color:var(--muted)}
.about-note{padding-top:35px;padding-bottom:78px;display:grid;grid-template-columns:1.05fr .95fr;gap:55px;align-items:start}
.about-note h2{font:700 32px/1.2 var(--display);margin:0}
.about-note p{color:var(--muted);margin:0}

.tools-index{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;padding-bottom:44px}
.tools-index a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;display:grid;gap:4px;min-height:115px;transition:.2s ease}
.tools-index a:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#bcd7df}
.tools-index span{font-size:11px;font-weight:800;color:var(--blue)}
.tools-index strong{font-size:14px;line-height:1.3}
.tools-index small{font-size:11px;color:var(--muted);line-height:1.35}
.calculator-library{padding-bottom:60px;display:grid;gap:14px}
.calc-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.calc-panel[open]{box-shadow:0 8px 28px rgba(16,39,51,.055)}
.calc-panel summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:16px;padding:20px 24px;font-weight:700}
.calc-panel summary::-webkit-details-marker{display:none}
.calc-panel summary>span{font-size:12px;color:var(--blue);font-weight:800;width:26px}
.calc-panel summary>div{display:grid;gap:1px}
.calc-panel summary strong{font-family:var(--display);font-size:22px}
.calc-panel summary small{font-size:12px;color:var(--muted);font-family:var(--body);font-weight:500}
.calc-panel summary:after{content:"+";margin-left:auto;color:var(--blue);font-size:24px;font-weight:500}
.calc-panel[open] summary:after{content:"−"}
.calc-body{border-top:1px solid var(--line);background:var(--aqua);padding:24px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px}
.calc-panel .calculator-inputs,.calc-panel .calculator-results{box-shadow:none}
.calculator-inputs select{width:100%;box-sizing:border-box;margin-top:7px;padding:11px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink);background:#fff}
.highlight-result{margin-top:5px;padding:15px 13px!important;border:0!important;border-radius:9px;background:var(--aqua)}
.calc-body .highlight-result{background:#e2f2f6}
.highlight-result strong{color:var(--blue)!important}
.calc-panel>.calculator-note{margin:0;padding:0 24px 20px;background:#fff}
.tools-safety-note{margin-bottom:72px;border-left:4px solid var(--blue);background:#fff;border-radius:0 12px 12px 0;padding-top:20px;padding-bottom:20px}
.tools-safety-note strong{display:block;margin-bottom:4px}
.tools-safety-note p{margin:0;color:var(--muted);max-width:900px}

@media(max-width:950px){
  .tool-grid-four{grid-template-columns:repeat(2,1fr)}
  .tools-index{grid-template-columns:repeat(2,1fr)}
  .books-grid{grid-template-columns:repeat(2,1fr)}
  .about-hero,.about-note{grid-template-columns:1fr;gap:28px}
  .about-values-grid{grid-template-columns:1fr}
}
@media(max-width:650px){
  .tool-grid-four,.tools-index,.books-grid{grid-template-columns:1fr}
  .calc-body{grid-template-columns:1fr;padding:16px}
  .calc-panel summary{padding:17px 18px}
  .calc-panel summary strong{font-size:19px}
  .about-hero{padding-top:54px;padding-bottom:48px}
}


/* Articles page — v5.1 */
.articles-hero{padding-bottom:34px}
.articles-page-list{max-width:900px}
.article-list-card{display:flex;flex-direction:column}
.article-list-card .text-link{align-self:flex-start}
.empty-articles-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-bottom:70px}
.empty-articles-card h2{font:700 28px/1.2 var(--display);margin:0 0 8px}
.empty-articles-card p{margin:0;color:var(--muted)}
.empty-articles-card .admin-hint{margin-top:16px;padding:12px 14px;background:var(--aqua);border-radius:8px;color:var(--ink)}