/* HEADER */
.site-header{position:sticky;top:0;z-index:1000;background:rgba(10,25,47,0.97);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,0.06);height:var(--header-height);}
.header-inner{display:flex;align-items:center;gap:24px;height:var(--header-height);}
.site-logo{display:flex;align-items:center;flex-shrink:0;}
.logo-text{display:flex;align-items:center;gap:10px;}
.logo-icon{font-size:1.8rem;}
.logo-name{font-family:var(--font-heading);font-size:1.4rem;font-weight:800;color:#fff;letter-spacing:-0.02em;}
.header-search{flex:1;max-width:500px;position:relative;}
.search-wrapper{position:relative;}
.search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);font-size:1rem;pointer-events:none;}
.search-input{width:100%;padding:10px 16px 10px 40px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.12);border-radius:999px;color:#fff;font-family:var(--font-body);font-size:0.9rem;transition:all 0.25s;}
.search-input::placeholder{color:rgba(255,255,255,0.4);}
.search-input:focus{outline:none;background:rgba(255,255,255,0.12);border-color:var(--color-accent);box-shadow:0 0 0 3px rgba(0,217,255,0.15);}
.search-results{position:absolute;top:calc(100% + 8px);left:0;right:0;background:#fff;border-radius:var(--radius-md);box-shadow:0 20px 60px rgba(0,0,0,0.15);max-height:360px;overflow-y:auto;display:none;z-index:2000;}
.search-results.active{display:block;}
.search-result-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--color-border);text-decoration:none;transition:background 0.15s;}
.search-result-item:hover{background:var(--color-bg);}
.search-result-item:last-child{border:none;}
.sri-icon{font-size:1.4rem;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--color-bg);border-radius:8px;flex-shrink:0;}
.sri-title{font-weight:600;font-size:0.9rem;color:var(--color-text);}
.sri-cat{font-size:0.75rem;color:var(--color-text-muted);}
.primary-nav{margin-left:auto;}
.nav-menu{display:flex;align-items:center;gap:4px;}
.nav-menu li a{padding:8px 14px;color:rgba(255,255,255,0.75);font-size:0.9rem;font-weight:500;border-radius:var(--radius-sm);transition:all 0.2s;white-space:nowrap;}
.nav-menu li a:hover{color:#fff;background:rgba(255,255,255,0.08);}
.mobile-toggle{display:none;flex-direction:column;gap:5px;padding:8px;}
.mobile-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:all 0.3s;}
.mobile-toggle.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px);}
.mobile-toggle.open span:nth-child(2){opacity:0;}
.mobile-toggle.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px);}
.mobile-drawer{display:none;background:rgba(10,25,47,0.98);padding:16px 0;}
.mobile-drawer.open{display:block;}
.mobile-menu{display:flex;flex-direction:column;}
.mobile-menu li a{display:block;padding:12px 0;color:rgba(255,255,255,0.8);font-size:1rem;border-bottom:1px solid rgba(255,255,255,0.06);}

/* HERO */
.hero-section{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--color-primary) 0%,#0d2137 50%,var(--color-secondary) 100%);padding:90px 0 80px;min-height:88vh;display:flex;align-items:center;}
.hero-bg{position:absolute;inset:0;pointer-events:none;}
.hero-blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:0.15;animation:blobFloat 8s ease-in-out infinite alternate;}
.blob-1{width:600px;height:600px;background:var(--color-accent);top:-200px;right:-100px;}
.blob-2{width:400px;height:400px;background:var(--color-accent-2);bottom:-100px;left:-50px;animation-delay:3s;}
@keyframes blobFloat{from{transform:translate(0,0) scale(1);}to{transform:translate(30px,20px) scale(1.05);}}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1;}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(0,217,255,0.12);border:1px solid rgba(0,217,255,0.25);color:var(--color-accent);padding:8px 18px;border-radius:999px;font-size:0.85rem;font-weight:600;margin-bottom:24px;}
.hero-title{color:#fff;margin-bottom:20px;line-height:1.1;}
.gradient-text{background:linear-gradient(135deg,var(--color-accent),var(--color-accent-2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.hero-desc{color:rgba(255,255,255,0.65);font-size:1.1rem;max-width:480px;margin-bottom:32px;}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px;}
.btn-outline{color:#fff;border-color:rgba(255,255,255,0.3);}
.btn-outline:hover{background:#fff;color:var(--color-primary);border-color:#fff;}
.hero-stats{display:flex;gap:32px;}
.hstat{text-align:center;}
.hstat strong{display:block;font-size:1.6rem;font-weight:800;color:#fff;font-family:var(--font-heading);}
.hstat span{font-size:0.78rem;color:rgba(255,255,255,0.5);text-transform:uppercase;letter-spacing:0.08em;}
.hero-visual{display:flex;align-items:center;justify-content:center;}
.floating-cards{position:relative;width:340px;height:340px;}
.float-card{position:absolute;background:rgba(255,255,255,0.1);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.15);border-radius:var(--radius-md);padding:10px 16px;display:flex;align-items:center;gap:10px;color:#fff;font-size:0.85rem;font-weight:600;white-space:nowrap;animation:floatCard 4s ease-in-out infinite alternate;}
.float-card span{font-size:0.8rem;}
.fc-1{top:0;left:20px;animation-delay:0s;}.fc-2{top:60px;right:0;animation-delay:0.5s;}.fc-3{top:130px;left:0;animation-delay:1s;}.fc-4{top:130px;right:20px;animation-delay:1.5s;}.fc-5{top:210px;left:30px;animation-delay:2s;}.fc-6{top:210px;right:0;animation-delay:2.5s;}
@keyframes floatCard{from{transform:translateY(0);}to{transform:translateY(-10px);}}

/* CATEGORY TABS */
.cat-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px;}
.cat-tab{padding:8px 18px;border-radius:999px;font-size:0.85rem;font-weight:600;border:2px solid var(--color-border);color:var(--color-text-muted);cursor:pointer;transition:all 0.2s;background:#fff;}
.cat-tab:hover{border-color:var(--color-accent);color:var(--color-accent);}
.cat-tab.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary);}
.tab-count{background:rgba(255,255,255,0.2);padding:1px 6px;border-radius:999px;font-size:0.72rem;margin-left:4px;}
.cat-tab:not(.active) .tab-count{background:var(--color-bg);color:var(--color-text-muted);}

/* TOOLS GRID */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;}
.tool-card{background:var(--color-card);border-radius:var(--radius-lg);border:1px solid var(--color-border);overflow:hidden;transition:all 0.25s;}
.tool-card:hover{transform:translateY(-4px);box-shadow:0 10px 40px rgba(0,0,0,0.12);border-color:transparent;}
.card-link{display:flex;flex-direction:column;gap:12px;padding:20px;height:100%;}
.card-top{display:flex;align-items:center;justify-content:space-between;}
.tool-icon{width:48px;height:48px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.5rem;}
.cat-finance{background:rgba(16,185,129,0.12);}.cat-health{background:rgba(245,158,11,0.12);}.cat-math{background:rgba(59,130,246,0.12);}.cat-physics{background:rgba(139,92,246,0.12);}.cat-unit{background:rgba(236,72,153,0.12);}.cat-other{background:rgba(239,68,68,0.12);}
.card-title{font-size:1rem;font-weight:700;color:var(--color-primary);margin:0;}
.card-excerpt{font-size:0.85rem;color:var(--color-text-muted);margin:0;flex:1;}
.card-footer{display:flex;align-items:center;justify-content:space-between;padding-top:12px;border-top:1px solid var(--color-border);margin-top:auto;}
.use-btn{font-size:0.82rem;font-weight:700;color:var(--color-accent);display:flex;align-items:center;gap:4px;transition:gap 0.2s;}
.tool-card:hover .use-btn{gap:8px;}
.free-tag{font-size:0.7rem;font-weight:700;color:#10B981;letter-spacing:0.05em;}
.tool-card.hidden{display:none;}

/* CATEGORY CARDS */
.cat-cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px;}
.cat-card{background:var(--color-card);border-radius:var(--radius-lg);padding:28px;border:1px solid var(--color-border);border-top:4px solid var(--cat-color);transition:all 0.25s;}
.cat-card:hover{box-shadow:0 10px 40px rgba(0,0,0,0.12);transform:translateY(-3px);}
.cat-card-header{display:flex;gap:16px;align-items:flex-start;margin-bottom:20px;}
.cat-big-icon{font-size:2.5rem;line-height:1;flex-shrink:0;}
.cat-card-header h3{font-size:1.25rem;margin-bottom:6px;}
.cat-card-header p{font-size:0.82rem;color:var(--color-text-muted);margin:0;}
.cat-tool-list{display:flex;flex-direction:column;gap:4px;margin-bottom:20px;}
.cat-tool-list li a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--radius-sm);font-size:0.88rem;color:var(--color-text);transition:background 0.15s;}
.cat-tool-list li a:hover{background:var(--color-bg);color:var(--cat-color);}
.cat-tool-list li a span{font-size:1.1rem;width:24px;}
.cat-view-all{display:flex;align-items:center;gap:8px;color:var(--cat-color);font-weight:700;font-size:0.88rem;padding-top:16px;border-top:1px solid var(--color-border);transition:gap 0.2s;}
.cat-view-all:hover{gap:12px;}

/* RECENT TOOLS */
.recent-section{background:var(--color-primary);}
.recent-section .section-header h2{color:#fff;}
.recent-section .label{color:var(--color-accent);}
.recent-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;}
.recent-card{display:flex;align-items:center;gap:14px;padding:16px 20px;background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.08);border-radius:var(--radius-md);transition:all 0.2s;color:#fff;}
.recent-card:hover{background:rgba(255,255,255,0.1);transform:translateX(4px);}
.recent-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0;}
.recent-info{flex:1;min-width:0;}
.recent-info .badge{margin-bottom:4px;}
.recent-info h5{color:#fff;font-size:0.9rem;margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.recent-info p{color:rgba(255,255,255,0.5);font-size:0.78rem;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.recent-arrow{color:var(--color-accent);font-size:1.1rem;flex-shrink:0;}

/* FEATURES */
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px;}
.feature-card{background:var(--color-card);border-radius:var(--radius-lg);padding:28px;border:1px solid var(--color-border);text-align:center;transition:all 0.25s;}
.feature-card:hover{box-shadow:0 4px 16px rgba(0,0,0,0.10);transform:translateY(-3px);}
.feature-icon{font-size:2.5rem;margin-bottom:16px;}
.feature-card h4{margin-bottom:8px;}
.feature-card p{margin:0;font-size:0.88rem;}

/* SINGLE TOOL */
.tool-hero{background:var(--color-primary);padding:48px 0;}
.breadcrumb{display:flex;gap:8px;align-items:center;font-size:0.82rem;color:rgba(255,255,255,0.5);margin-bottom:20px;}
.breadcrumb a{color:rgba(255,255,255,0.6);}.breadcrumb a:hover{color:var(--color-accent);}
.breadcrumb span{color:rgba(255,255,255,0.8);}
.tool-hero-content{display:flex;align-items:flex-start;gap:20px;}
.tool-hero-icon{width:64px;height:64px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:2rem;flex-shrink:0;}
.tool-hero-content h1{color:#fff;font-size:clamp(1.5rem,3vw,2.2rem);margin:8px 0;}
.tool-desc{color:rgba(255,255,255,0.65);margin:0;}
.tool-layout{display:grid;grid-template-columns:1fr 300px;gap:32px;padding-top:40px;padding-bottom:60px;}
.tool-calculator-box{background:var(--color-card);border-radius:var(--radius-lg);padding:32px;box-shadow:0 1px 3px rgba(0,0,0,0.08);border:1px solid var(--color-border);}
.related-tools{margin-top:32px;}
.related-tools h3{margin-bottom:16px;}
.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.related-card{display:flex;align-items:center;gap:10px;padding:12px 16px;background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:0.88rem;font-weight:500;color:var(--color-text);transition:all 0.2s;}
.related-card:hover{border-color:var(--color-accent);color:var(--color-accent);transform:translateY(-2px);}
.related-icon{font-size:1.2rem;}

/* ARCHIVE */
.archive-hero{background:var(--color-primary);padding:48px 0;}
.archive-hero h1{color:#fff;}
.archive-hero p{color:rgba(255,255,255,0.65);margin:8px 0 0;}
.archive-count{font-size:0.85rem !important;color:var(--color-accent) !important;}
.pagination{margin-top:40px;display:flex;justify-content:center;gap:8px;}
.pagination .page-numbers{padding:8px 16px;border-radius:var(--radius-sm);border:1px solid var(--color-border);color:var(--color-text);transition:all 0.2s;}
.pagination .page-numbers.current{background:var(--color-primary);color:#fff;border-color:var(--color-primary);}
.pagination .page-numbers:hover:not(.current){border-color:var(--color-accent);color:var(--color-accent);}

/* 404 */
.error-page{min-height:60vh;display:flex;align-items:center;}
.error-inner{padding:60px 0;text-align:center;}
.error-emoji{font-size:5rem;margin-bottom:16px;}
.error-inner h1{font-size:8rem;color:var(--color-primary);opacity:0.1;line-height:1;margin-bottom:-20px;}
.error-inner h2{margin-bottom:12px;}
.error-search{margin-top:32px;}

/* FOOTER */
.site-footer{background:var(--color-primary);color:rgba(255,255,255,0.7);}
.footer-top{padding:60px 0 40px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;color:#fff;}
.footer-logo .logo-name{font-family:var(--font-heading);font-size:1.3rem;font-weight:800;}
.footer-brand p{font-size:0.88rem;margin-bottom:24px;}
.footer-stats{display:flex;gap:24px;}
.footer-stats .stat strong{display:block;font-size:1.4rem;color:#fff;font-family:var(--font-heading);}
.footer-stats .stat span{font-size:0.72rem;text-transform:uppercase;letter-spacing:0.08em;}
.footer-heading{color:#fff;font-size:0.85rem;text-transform:uppercase;letter-spacing:0.12em;margin-bottom:20px;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links li a{display:flex;align-items:center;justify-content:space-between;font-size:0.88rem;color:rgba(255,255,255,0.6);transition:color 0.2s;}
.footer-links li a:hover{color:var(--color-accent);}
.cat-count{background:rgba(255,255,255,0.1);padding:2px 8px;border-radius:999px;font-size:0.72rem;}
.footer-newsletter{margin-top:28px;}
.footer-newsletter h6{color:#fff;font-size:0.82rem;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:10px;}
.newsletter-form{display:flex;gap:8px;}
.newsletter-input{flex:1;padding:9px 14px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);border-radius:var(--radius-sm);color:#fff;font-size:0.85rem;min-width:0;}
.newsletter-input::placeholder{color:rgba(255,255,255,0.35);}
.newsletter-input:focus{outline:none;border-color:var(--color-accent);}
.btn-sm{padding:8px 16px;font-size:0.82rem;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding:20px 0;}
.footer-bottom-inner{display:flex;align-items:center;justify-content:space-between;}
.footer-bottom p{margin:0;font-size:0.82rem;color:rgba(255,255,255,0.4);}

/* UTILS */
.section-header{margin-bottom:40px;}
.section-header.flex-between{display:flex;align-items:flex-end;justify-content:space-between;}
.label{display:inline-block;font-size:0.78rem;font-weight:700;text-transform:uppercase;letter-spacing:0.15em;color:var(--color-accent);margin-bottom:8px;}
.widget{background:var(--color-card);border-radius:var(--radius-lg);padding:24px;border:1px solid var(--color-border);margin-bottom:24px;}
.widget-title{font-size:1rem;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--color-border);}
.popular-tools-list{display:flex;flex-direction:column;gap:4px;}
.popular-tools-list li a{display:flex;align-items:center;gap:10px;padding:8px;border-radius:var(--radius-sm);font-size:0.88rem;color:var(--color-text);transition:background 0.15s;}
.popular-tools-list li a:hover{background:var(--color-bg);color:var(--color-accent);}