@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');
:root{--primary:#4F46E5;--primary-dark:#4338CA;--secondary:#7C3AED;--accent:#F59E0B;--bg:#F8FAFC;--card:#FFFFFF;--text:#1E293B;--muted:#64748B;--border:#E2E8F0;--success:#10B981;--danger:#EF4444;--shadow:0 1px 3px rgba(0,0,0,.1);--shadow-md:0 4px 12px rgba(0,0,0,.1);--shadow-lg:0 10px 40px rgba(0,0,0,.12);--radius:12px;--radius-lg:16px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Plus Jakarta Sans',sans-serif;font-weight:700;line-height:1.2}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.section{padding:4rem 0}
.section-sm{padding:2rem 0}
.text-center{text-align:center}
img{max-width:100%;height:auto;display:block}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:50px;font-weight:600;font-size:.95rem;cursor:pointer;border:none;transition:all .2s;text-decoration:none}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:0 4px 15px rgba(79,70,229,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(79,70,229,.4);color:#fff}
.btn-secondary{background:var(--card);color:var(--primary);border:2px solid var(--primary)}
.btn-secondary:hover{background:var(--primary);color:#fff}
.btn-accent{background:var(--accent);color:#fff}
.btn-sm{padding:.5rem 1rem;font-size:.875rem}

/* Navbar */
.navbar{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:70px}
.nav-logo{font-family:'Plus Jakarta Sans',sans-serif;font-size:1.5rem;font-weight:800;color:var(--primary);text-decoration:none;display:flex;align-items:center;gap:.5rem}
.nav-links{display:flex;align-items:center;gap:2rem}
.nav-links a{color:var(--text);font-weight:500;font-size:.95rem;position:relative;padding:.25rem 0}
.nav-links a::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--primary);transition:width .2s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-actions{display:flex;align-items:center;gap:1rem}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:.5rem;background:none;border:none}
.hamburger span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:all .3s}
.mobile-menu{position:fixed;top:0;right:-100%;width:280px;height:100vh;background:var(--card);box-shadow:var(--shadow-lg);z-index:1001;transition:right .3s;padding:2rem;display:flex;flex-direction:column;gap:1.5rem}
.mobile-menu.open{right:0}
.mobile-menu-close{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--muted)}
.mobile-menu a{color:var(--text);font-weight:500;font-size:1.1rem;padding:.5rem 0;border-bottom:1px solid var(--border);display:block}
.mobile-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;opacity:0;pointer-events:none;transition:opacity .3s}
.mobile-overlay.open{opacity:1;pointer-events:all}

/* Hero */
.hero{background:linear-gradient(135deg,#4F46E5 0%,#7C3AED 50%,#4F46E5 100%);padding:5rem 0;color:#fff;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");opacity:.5}
.hero-content{position:relative;z-index:1}
.hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;margin-bottom:1rem;text-shadow:0 2px 10px rgba(0,0,0,.2)}
.hero p{font-size:clamp(1rem,2vw,1.25rem);opacity:.9;max-width:600px;margin:0 auto 2rem}
.hero-btns{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.hero-stats{display:flex;justify-content:center;gap:3rem;margin-top:3rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.2)}
.hero-stat{text-align:center}
.hero-stat .num{font-family:'Plus Jakarta Sans',sans-serif;font-size:2rem;font-weight:800}
.hero-stat .label{font-size:.875rem;opacity:.8}

/* Categories */
.categories-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem}
.category-card{background:var(--card);border-radius:var(--radius-lg);padding:2rem;border:1px solid var(--border);transition:all .3s;cursor:pointer;text-decoration:none;display:block;color:var(--text)}
.category-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--primary);color:var(--primary)}
.cat-icon{font-size:2.5rem;margin-bottom:1rem}
.category-card h3{font-size:1.1rem;margin-bottom:.5rem}
.category-card p{font-size:.875rem;color:var(--muted);margin-bottom:.75rem}
.cat-count{font-size:.8rem;font-weight:600;color:var(--primary);background:rgba(79,70,229,.1);padding:.25rem .75rem;border-radius:50px;display:inline-block}

/* Tool Cards */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}
.tool-card{background:var(--card);border-radius:var(--radius);padding:1.5rem;border:1px solid var(--border);transition:all .3s;display:flex;flex-direction:column;gap:.75rem;text-decoration:none;color:var(--text)}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--primary);color:var(--primary)}
.tool-icon{font-size:2rem}
.tool-card h3{font-size:1rem;font-weight:600}
.tool-card p{font-size:.85rem;color:var(--muted);flex-grow:1}
.tool-card .try-link{font-size:.85rem;font-weight:600;color:var(--primary);display:flex;align-items:center;gap:.25rem}
.tool-card .try-link::after{content:'→';transition:transform .2s}
.tool-card:hover .try-link::after{transform:translateX(4px)}

/* Article Cards */
.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}
.article-card{background:var(--card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:all .3s;text-decoration:none;color:var(--text);display:flex;flex-direction:column}
.article-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.article-img{width:100%;height:180px;object-fit:cover}
.article-body{padding:1.25rem;flex-grow:1;display:flex;flex-direction:column}
.article-meta{display:flex;align-items:center;gap:1rem;font-size:.8rem;color:var(--muted);margin-bottom:.5rem}
.article-badge{background:rgba(79,70,229,.1);color:var(--primary);padding:.2rem .6rem;border-radius:50px;font-weight:600;font-size:.75rem}
.article-card h3{font-size:1rem;margin-bottom:.5rem;line-height:1.4}
.article-card p{font-size:.85rem;color:var(--muted);flex-grow:1;margin-bottom:.75rem}
.read-time{font-size:.8rem;font-weight:500;color:var(--primary)}

/* Search & Filter */
.search-bar{max-width:500px;margin:0 auto 2rem}
.search-input{width:100%;padding:.875rem 1rem .875rem 3rem;border:2px solid var(--border);border-radius:50px;font-size:1rem;outline:none;transition:border-color .2s;background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") 1rem center no-repeat}
.search-input:focus{border-color:var(--primary)}
.filter-bar{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center;margin-bottom:2rem}
.filter-btn{padding:.5rem 1.25rem;border-radius:50px;border:1px solid var(--border);background:var(--card);color:var(--text);font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s}
.filter-btn:hover,.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}
.feature-card{background:var(--card);border-radius:var(--radius-lg);padding:2rem;text-align:center;border:1px solid var(--border)}
.feature-icon{font-size:2.5rem;margin-bottom:1rem}
.feature-card h3{font-size:1.1rem;margin-bottom:.5rem}
.feature-card p{font-size:.9rem;color:var(--muted)}

/* Stats */
.stats-section{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:3rem 0;border-radius:var(--radius-lg)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;text-align:center}
.stat-item .stat-num{font-family:'Plus Jakarta Sans',sans-serif;font-size:2.5rem;font-weight:800}
.stat-item .stat-label{font-size:.9rem;opacity:.85}

/* FAQ */
.faq-list{max-width:700px;margin:0 auto;display:flex;flex-direction:column;gap:1rem}
.faq-item{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden}
.faq-q{padding:1.25rem 1.5rem;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem;border:none;background:none;width:100%;text-align:left;font-size:1rem;font-family:inherit;color:var(--text)}
.faq-q:hover{color:var(--primary)}
.faq-q::after{content:'+';font-size:1.5rem;color:var(--muted);transition:transform .2s;flex-shrink:0}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 1.5rem;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:var(--muted);font-size:.95rem}
.faq-item.open .faq-a{padding:0 1.5rem 1.25rem;max-height:500px}

/* Tool Detail Page */
.tool-detail{max-width:800px;margin:0 auto}
.tool-calc{background:var(--card);border-radius:var(--radius-lg);padding:2rem;border:1px solid var(--border);margin-bottom:2rem}
.calc-form{display:flex;flex-direction:column;gap:1rem}
.calc-row{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.calc-field{flex:1;min-width:200px}
.calc-field label{display:block;font-weight:500;margin-bottom:.5rem;font-size:.9rem}
.calc-field input,.calc-field select,.calc-field textarea{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:var(--radius);font-size:1rem;font-family:inherit;outline:none;transition:border-color .2s;background:var(--card)}
.calc-field input:focus,.calc-field select:focus,.calc-field textarea:focus{border-color:var(--primary)}
.calc-result{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:1.5rem;border-radius:var(--radius);text-align:center;margin-top:1rem;display:none}
.calc-result.show{display:block}
.calc-result .result-value{font-family:'Plus Jakarta Sans',sans-serif;font-size:2rem;font-weight:800;margin-bottom:.25rem}
.calc-result .result-label{font-size:.9rem;opacity:.85}
.calc-btn{width:100%;padding:1rem;border-radius:var(--radius);background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-size:1rem;font-weight:700;border:none;cursor:pointer;transition:all .2s;font-family:inherit}
.calc-btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px rgba(79,70,229,.3)}
.related-tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}
.related-tool{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;text-align:center;text-decoration:none;color:var(--text);transition:all .2s}
.related-tool:hover{border-color:var(--primary);color:var(--primary)}

/* Article Page */
.article-header{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:3rem 0;text-align:center}
.article-header h1{font-size:clamp(1.5rem,4vw,2.5rem);margin-bottom:1rem}
.article-meta-bar{display:flex;justify-content:center;gap:1.5rem;font-size:.9rem;opacity:.85;flex-wrap:wrap}
.article-content{max-width:750px;margin:0 auto;padding:3rem 1.5rem}
.article-content h2{font-size:1.5rem;margin:2rem 0 1rem;color:var(--text)}
.article-content h3{font-size:1.2rem;margin:1.5rem 0 .75rem}
.article-content p{margin-bottom:1rem;line-height:1.8;font-size:1.05rem}
.article-content ul,.article-content ol{margin:1rem 0 1rem 1.5rem}
.article-content li{margin-bottom:.5rem;line-height:1.7}
.article-content img{border-radius:var(--radius);margin:1.5rem auto;max-width:100%}
.article-content strong{color:var(--primary)}
.toc{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:2rem}
.toc h4{font-size:1rem;margin-bottom:.75rem}
.toc ol{margin:0 0 0 1.25rem;font-size:.9rem}
.toc li{margin-bottom:.35rem}

/* Forms */
.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-weight:500;margin-bottom:.5rem}
.form-control{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:var(--radius);font-size:1rem;outline:none;transition:border-color .2s;background:var(--card);font-family:inherit}
.form-control:focus{border-color:var(--primary)}
textarea.form-control{resize:vertical;min-height:120px}

/* Footer */
.footer{background:#1E293B;color:#94A3B8;padding:4rem 0 2rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:3rem;margin-bottom:3rem}
.footer-brand .nav-logo{color:#fff;margin-bottom:.75rem;display:inline-flex}
.footer-brand p{font-size:.9rem;line-height:1.6}
.footer h4{color:#fff;font-size:.95rem;margin-bottom:1rem;font-weight:600}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:.5rem}
.footer-links a{color:#94A3B8;font-size:.9rem;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:1.5rem;text-align:center;font-size:.85rem}
.footer-social{display:flex;gap:1rem;margin-top:1rem}
.footer-social a{font-size:1.25rem}

/* 404 */
.error-page{text-align:center;padding:5rem 1.5rem}
.error-page .error-code{font-family:'Plus Jakarta Sans',sans-serif;font-size:8rem;font-weight:800;color:var(--primary);line-height:1}
.error-page h1{font-size:1.5rem;margin:.5rem 0 1rem}
.error-page p{color:var(--muted);margin-bottom:2rem}
.error-search{max-width:400px;margin:0 auto 2rem}

/* Pagination */
.pagination{display:flex;justify-content:center;gap:.5rem;margin-top:2rem}
.page-btn{padding:.5rem 1rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);cursor:pointer;font-size:.9rem;transition:all .2s}
.page-btn:hover,.page-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Alert */
.alert{padding:1rem 1.25rem;border-radius:var(--radius);margin-bottom:1rem;font-size:.95rem}
.alert-info{background:rgba(79,70,229,.1);border:1px solid rgba(79,70,229,.2);color:var(--primary)}
.alert-danger{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.2);color:var(--danger)}

/* Table of contents for articles */
.article-content table{width:100%;border-collapse:collapse;margin:1.5rem 0}
.article-content th,.article-content td{padding:.75rem 1rem;border:1px solid var(--border);text-align:left;font-size:.95rem}
.article-content th{background:rgba(79,70,229,.05);font-weight:600}
.article-content tr:hover{background:rgba(79,70,229,.02)}

/* Responsive */
@media(max-width:1024px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:768px){
.nav-links{display:none}
.hamburger{display:flex}
.hero{padding:3rem 0}
.hero-stats{gap:1.5rem}
.hero-stat .num{font-size:1.5rem}
.stats-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:1fr;gap:2rem}
.categories-grid{grid-template-columns:repeat(2,1fr)}
.tools-grid{grid-template-columns:1fr}
.articles-grid{grid-template-columns:1fr}
.features-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
.categories-grid{grid-template-columns:1fr}
.calc-row{flex-direction:column}
.calc-field{min-width:100%}
.hero-stats{flex-direction:column;gap:1rem}
}

/* Article card - uniform height */
.article-card img{width:100%;height:180px;object-fit:cover;border-radius:.5rem .5rem 0 0;display:block}
.article-card-body{padding:1.25rem 1.25rem 1.5rem;display:flex;flex-direction:column;flex-grow:1}
.article-card h3{font-size:1rem;margin:.375rem 0 .5rem;line-height:1.4;flex-grow:1}
.article-card p{font-size:.875rem;color:var(--muted);line-height:1.5;margin:0}
.article-card .tool-category{font-size:.7rem;font-weight:600;text-transform:uppercase;color:var(--secondary);letter-spacing:.03em}

/* Ensure all cards in grid have equal height */
.cards-grid{align-items:stretch}
.cards-grid .card{display:flex;flex-direction:column;padding:0;overflow:hidden}