:root{--font-sans:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;--font-heading:'Outfit',sans-serif;--bg-base:#0a0e17;--bg-surface:#111827;--bg-surface-elevated:#1f2937;--bg-input:#161f30;--border-subtle:#2d3748;--border-accent:#3b82f6;--text-main:#f9fafb;--text-muted:#9ca3af;--text-dim:#6b7280;--primary:#3b82f6;--primary-hover:#2563eb;--primary-glow:rgba(59,130,246,0.25);--accent:#10b981;--accent-hover:#059669;--danger:#ef4444;--warning:#f59e0b;--card-shadow:0 10px 25px -5px rgba(0,0,0,0.5),0 8px 10px -6px rgba(0,0,0,0.5);--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--transition:all 0.2s cubic-bezier(0.4,0,0.2,1)}
[data-theme='light']{--bg-base:#f8fafc;--bg-surface:#ffffff;--bg-surface-elevated:#f1f5f9;--bg-input:#ffffff;--border-subtle:#e2e8f0;--border-accent:#3b82f6;--text-main:#0f172a;--text-muted:#475569;--text-dim:#94a3b8;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-glow:rgba(37,99,235,0.15);--accent:#059669;--accent-hover:#047857;--danger:#dc2626;--warning:#d97706;--card-shadow:0 10px 25px -5px rgba(15,23,42,0.08),0 8px 10px -6px rgba(15,23,42,0.04)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-family:var(--font-sans);background-color:var(--bg-base);color:var(--text-main);scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{min-height:100vh;display:flex;flex-direction:column;line-height:1.6;overflow-x:hidden;width:100%}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-hover)}
button,input,select,textarea{font-family:inherit;font-size:inherit}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-container{width:100%;max-width:1240px;margin:0 auto;padding:0 20px}
.header-nav{position:sticky;top:0;z-index:1000;background:var(--bg-surface);border-bottom:1px solid var(--border-subtle);backdrop-filter:blur(8px)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-heading);font-weight:700;font-size:1.35rem;color:var(--text-main)}
.brand-icon{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;color:#ffffff}
.brand-text span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:24px;list-style:none}
.nav-item{position:relative}
.nav-link{font-weight:500;color:var(--text-muted);display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:var(--radius-sm);cursor:pointer;background:none;border:none}
.nav-link:hover{color:var(--text-main);background:var(--bg-surface-elevated)}
.dropdown-chevron{transition:transform 0.2s ease}
.tools-dropdown:hover .dropdown-chevron,.tools-dropdown.open .dropdown-chevron{transform:rotate(180deg)}
.tools-dropdown-menu{display:none;position:absolute;top:100%;left:-120px;width:760px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);box-shadow:var(--card-shadow);padding:20px;z-index:1100}
.tools-dropdown:hover .tools-dropdown-menu,.tools-dropdown.open .tools-dropdown-menu{display:block}
.tools-grid-mega{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.mega-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--radius-sm);color:var(--text-muted);font-size:0.875rem;transition:var(--transition)}
.mega-item:hover{background:var(--bg-surface-elevated);color:var(--primary);transform:translateX(2px)}
.mega-dot{width:6px;height:6px;background:var(--primary);border-radius:50%;flex-shrink:0}
.nav-actions{display:flex;align-items:center;gap:12px}
.theme-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);color:var(--text-main);cursor:pointer;transition:var(--transition)}
.theme-btn:hover{border-color:var(--border-accent);color:var(--primary)}
.mobile-toggle{display:none;align-items:center;justify-content:center;width:40px;height:40px;background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-main);cursor:pointer}
.breadcrumb-wrapper{background:var(--bg-surface-elevated);border-bottom:1px solid var(--border-subtle);padding:10px 0;font-size:0.875rem}
.breadcrumb-list{display:flex;align-items:center;gap:8px;list-style:none;flex-wrap:wrap}
.breadcrumb-item{display:flex;align-items:center;gap:8px;color:var(--text-dim)}
.breadcrumb-item a{color:var(--text-muted)}
.breadcrumb-item a:hover{color:var(--primary)}
.breadcrumb-item.active{color:var(--text-main);font-weight:500}
.hero-section{padding:48px 0 32px}
.hero-header{text-align:center;max-width:820px;margin:0 auto 36px}
.badge-pill{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;background:rgba(59,130,246,0.1);border:1px solid rgba(59,130,246,0.25);border-radius:999px;font-size:0.825rem;font-weight:600;color:var(--primary);margin-bottom:16px}
.hero-title{font-family:var(--font-heading);font-size:clamp(2rem,4vw,2.75rem);font-weight:800;line-height:1.2;color:var(--text-main);margin-bottom:14px}
.hero-title span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-desc{font-size:1.1rem;color:var(--text-muted);max-width:700px;margin:0 auto}
.calc-wrapper{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--card-shadow);overflow:hidden;margin-bottom:40px}
.calc-nav-tabs{display:flex;background:var(--bg-surface-elevated);border-bottom:1px solid var(--border-subtle);overflow-x:auto}
.tab-trigger{flex:1;min-width:180px;padding:16px 20px;border:none;background:transparent;color:var(--text-muted);font-weight:600;font-size:0.95rem;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;border-bottom:3px solid transparent;transition:var(--transition)}
.tab-trigger:hover{color:var(--text-main);background:rgba(255,255,255,0.02)}
.tab-trigger.active{color:var(--primary);border-bottom-color:var(--primary);background:var(--bg-surface)}
.tab-panel{display:none;padding:28px 24px}
.tab-panel.active{display:block}
.grid-variants{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-bottom:24px}
.variant-card{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:20px;position:relative}
.variant-card.control-card{border-left:4px solid var(--primary)}
.variant-card.variation-card{border-left:4px solid var(--accent)}
.card-header-flex{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.card-title{font-family:var(--font-heading);font-size:1.15rem;font-weight:700;display:flex;align-items:center;gap:8px}
.badge-tag{font-size:0.75rem;padding:3px 8px;border-radius:4px;font-weight:700;text-transform:uppercase}
.badge-ctrl{background:rgba(59,130,246,0.15);color:var(--primary)}
.badge-var{background:rgba(16,185,129,0.15);color:var(--accent)}
.form-group{margin-bottom:16px}
.form-label{display:flex;justify-content:space-between;align-items:center;font-size:0.875rem;font-weight:500;color:var(--text-main);margin-bottom:6px}
.label-hint{font-size:0.75rem;color:var(--text-dim)}
.input-with-icon{position:relative}
.input-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-dim);pointer-events:none}
.form-input{width:100%;padding:10px 12px 10px 38px;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-main);font-size:0.95rem;transition:var(--transition)}
.form-input:focus{outline:none;border-color:var(--border-accent);box-shadow:0 0 0 3px var(--primary-glow)}
.form-input.is-invalid{border-color:var(--danger)}
.input-feedback{font-size:0.75rem;color:var(--danger);margin-top:4px;min-height:16px}
.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:16px 20px;margin-bottom:24px}
.select-input{width:100%;padding:10px 12px;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-main);font-size:0.95rem;cursor:pointer}
.actions-bar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:20px}
.actions-left{display:flex;gap:10px;flex-wrap:wrap}
.actions-right{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--radius-sm);font-weight:600;font-size:0.95rem;cursor:pointer;border:none;transition:var(--transition)}
.btn-primary{background:var(--primary);color:#ffffff}
.btn-primary:hover:not(:disabled){background:var(--primary-hover);box-shadow:0 4px 12px var(--primary-glow)}
.btn-primary:disabled{opacity:0.6;cursor:not-allowed}
.btn-secondary{background:var(--bg-surface-elevated);color:var(--text-main);border:1px solid var(--border-subtle)}
.btn-secondary:hover{background:var(--bg-input);border-color:var(--border-accent)}
.btn-outline{background:transparent;color:var(--text-muted);border:1px solid var(--border-subtle)}
.btn-outline:hover{color:var(--text-main);border-color:var(--border-subtle);background:var(--bg-surface-elevated)}
.btn-sm{padding:8px 14px;font-size:0.85rem}
.results-container{display:none;margin-top:32px;padding-top:32px;border-top:1px solid var(--border-subtle)}
.results-container.visible{display:block;animation:fadeIn 0.3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.verdict-banner{padding:20px;border-radius:var(--radius-md);display:flex;align-items:center;gap:16px;margin-bottom:24px}
.verdict-banner.winner{background:rgba(16,185,129,0.12);border:1px solid rgba(16,185,129,0.3);color:var(--text-main)}
.verdict-banner.loser{background:rgba(239,68,68,0.12);border:1px solid rgba(239,68,68,0.3);color:var(--text-main)}
.verdict-banner.inconclusive{background:rgba(245,158,11,0.12);border:1px solid rgba(245,158,11,0.3);color:var(--text-main)}
.verdict-icon{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.winner .verdict-icon{background:#10b981;color:#fff}
.loser .verdict-icon{background:#ef4444;color:#fff}
.inconclusive .verdict-icon{background:#f59e0b;color:#fff}
.verdict-text h3{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;margin-bottom:4px}
.verdict-text p{color:var(--text-muted);font-size:0.925rem}
.stats-cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:28px}
.stat-metric-card{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:16px;text-align:center}
.stat-metric-label{font-size:0.8rem;text-transform:uppercase;letter-spacing:0.05em;color:var(--text-dim);margin-bottom:6px}
.stat-metric-value{font-family:var(--font-heading);font-size:1.6rem;font-weight:800;color:var(--text-main)}
.stat-metric-sub{font-size:0.75rem;color:var(--text-muted);margin-top:4px}
.positive{color:var(--accent)!important}
.negative{color:var(--danger)!important}
.neutral{color:var(--text-muted)!important}
.chart-card{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:20px;margin-bottom:28px}
.chart-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:10px}
.chart-title{font-family:var(--font-heading);font-size:1.1rem;font-weight:700}
.chart-canvas-box{position:relative;width:100%;height:320px}
.srm-warning-box{display:none;background:rgba(239,68,68,0.15);border:1px solid var(--danger);border-radius:var(--radius-md);padding:16px;margin-bottom:24px}
.srm-warning-box.show{display:flex;gap:12px;align-items:flex-start}
.export-toolbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;background:var(--bg-surface-elevated);padding:14px 18px;border-radius:var(--radius-md);border:1px solid var(--border-subtle)}
.export-title{font-weight:600;font-size:0.9rem;color:var(--text-muted)}
.export-buttons{display:flex;gap:8px;flex-wrap:wrap}
.viewport-controls{display:flex;align-items:center;justify-content:space-between;background:var(--bg-surface-elevated);padding:12px 16px;border-radius:var(--radius-md);margin-bottom:20px;border:1px solid var(--border-subtle);flex-wrap:wrap;gap:10px}
.device-toggle-group{display:flex;gap:6px}
.preview-mode-btn{padding:6px 12px;border:1px solid var(--border-subtle);background:var(--bg-surface);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;font-size:0.825rem;font-weight:600;display:flex;align-items:center;gap:6px}
.preview-mode-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.side-by-side-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}
.webpage-column{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;display:flex;flex-direction:column}
.webpage-col-header{padding:14px 18px;background:var(--bg-surface);border-bottom:1px solid var(--border-subtle);display:flex;justify-content:space-between;align-items:center}
.webpage-col-url{font-size:0.85rem;color:var(--primary);font-weight:600;word-break:break-all}
.frame-container{width:100%;height:450px;background:#ffffff;position:relative;overflow:hidden;transition:var(--transition);margin:0 auto}
.frame-container.tablet{max-width:768px}
.frame-container.mobile{max-width:375px}
.preview-frame{width:100%;height:100%;border:none}
.webpage-meta-summary{padding:16px 20px;background:var(--bg-surface);border-top:1px solid var(--border-subtle);display:grid;grid-template-columns:1fr 1fr;gap:12px;font-size:0.825rem}
.webpage-meta-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--border-subtle);padding:6px 0}
.code-generator-box{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:24px;margin-bottom:24px}
.code-snippet-pre{background:#0b0f19;border:1px solid var(--border-subtle);border-radius:var(--radius-sm);padding:16px;color:#38bdf8;font-family:monospace;font-size:0.85rem;overflow-x:auto;white-space:pre-wrap;line-height:1.5}
.section-block{padding:48px 0}
.section-header{text-align:center;max-width:760px;margin:0 auto 36px}
.section-tag{font-size:0.8rem;font-weight:700;text-transform:uppercase;color:var(--primary);letter-spacing:0.1em;margin-bottom:8px}
.section-title{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-main);margin-bottom:12px}
.section-subtitle{font-size:1rem;color:var(--text-muted)}
.tools-showcase-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.tool-chip-card{display:flex;align-items:center;gap:12px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:14px 16px;color:var(--text-main);transition:var(--transition)}
.tool-chip-card:hover{border-color:var(--border-accent);background:var(--bg-surface-elevated);transform:translateY(-2px);color:var(--primary)}
.tool-chip-icon{width:32px;height:32px;border-radius:8px;background:rgba(59,130,246,0.1);display:flex;align-items:center;justify-content:center;color:var(--primary);flex-shrink:0}
.tool-chip-text{font-size:0.9rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.feature-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:28px 24px;transition:var(--transition)}
.feature-card:hover{border-color:var(--border-accent);transform:translateY(-4px);box-shadow:var(--card-shadow)}
.feature-icon-wrapper{width:48px;height:48px;border-radius:12px;background:rgba(59,130,246,0.1);display:flex;align-items:center;justify-content:center;color:var(--primary);margin-bottom:18px}
.feature-title{font-family:var(--font-heading);font-size:1.2rem;font-weight:700;color:var(--text-main);margin-bottom:10px}
.feature-desc{color:var(--text-muted);font-size:0.925rem}
.workflow-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;position:relative}
.step-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:24px;position:relative}
.step-num{position:absolute;top:16px;right:16px;font-family:var(--font-heading);font-size:2rem;font-weight:800;color:var(--border-subtle);line-height:1}
.step-title{font-family:var(--font-heading);font-size:1.1rem;font-weight:700;color:var(--text-main);margin-bottom:8px}
.step-desc{color:var(--text-muted);font-size:0.875rem}
.seo-article-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:36px;margin:0 auto;box-shadow:var(--card-shadow)}
.seo-article-card h2{font-family:var(--font-heading);font-size:1.6rem;font-weight:700;color:var(--text-main);margin-bottom:16px}
.seo-article-card h3{font-family:var(--font-heading);font-size:1.2rem;font-weight:600;color:var(--text-main);margin:24px 0 10px}
.seo-article-card p{color:var(--text-muted);font-size:0.975rem;line-height:1.75;margin-bottom:18px}
.seo-callout{background:var(--bg-surface-elevated);border-left:4px solid var(--primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:16px 20px;margin:20px 0}
.faq-container{max-width:840px;margin:0 auto}
.faq-item{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden}
.faq-question{width:100%;padding:20px 24px;background:none;border:none;display:flex;align-items:center;justify-content:space-between;text-align:left;font-family:var(--font-heading);font-size:1.05rem;font-weight:600;color:var(--text-main);cursor:pointer;transition:var(--transition)}
.faq-question:hover{color:var(--primary)}
.faq-icon{transition:transform 0.2s ease;flex-shrink:0}
.faq-item.open .faq-icon{transform:rotate(180deg)}
.faq-answer{display:none;padding:0 24px 20px;color:var(--text-muted);font-size:0.95rem;line-height:1.7}
.faq-item.open .faq-answer{display:block}
.cta-banner{background:linear-gradient(135deg,rgba(59,130,246,0.15),rgba(16,185,129,0.15));border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:48px 32px;text-align:center;margin:32px 0}
.cta-title{font-family:var(--font-heading);font-size:2rem;font-weight:800;color:var(--text-main);margin-bottom:12px}
.cta-desc{color:var(--text-muted);max-width:620px;margin:0 auto 24px;font-size:1.05rem}
.cta-btn-group{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.site-footer{background:var(--bg-surface);border-top:1px solid var(--border-subtle);padding:56px 0 24px;margin-top:auto}
.footer-cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.footer-col h4{font-family:var(--font-heading);font-size:1rem;font-weight:700;color:var(--text-main);margin-bottom:16px}
.footer-links{list-style:none}
.footer-links li{margin-bottom:8px}
.footer-links a{color:var(--text-muted);font-size:0.875rem}
.footer-links a:hover{color:var(--primary)}
.trademark-box{background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);padding:14px;font-size:0.775rem;color:var(--text-dim);line-height:1.5;margin-bottom:24px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:20px;border-top:1px solid var(--border-subtle);font-size:0.85rem;color:var(--text-dim)}
.cookie-banner{position:fixed;bottom:20px;left:20px;right:20px;max-width:540px;background:var(--bg-surface);border:1px solid var(--border-subtle);box-shadow:var(--card-shadow);border-radius:var(--radius-md);padding:18px 20px;z-index:9999;display:none;align-items:center;justify-content:space-between;gap:16px;animation:slideUp 0.3s ease}
@keyframes slideUp{from{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}
.cookie-banner.show{display:flex}
.cookie-text{font-size:0.825rem;color:var(--text-muted);line-height:1.4}
.cookie-actions{display:flex;gap:8px;flex-shrink:0}
.toast-notice{position:fixed;bottom:30px;right:30px;background:#10b981;color:#ffffff;padding:12px 20px;border-radius:var(--radius-sm);box-shadow:var(--card-shadow);font-size:0.875rem;font-weight:600;z-index:10000;display:none}
.toast-notice.show{display:block;animation:fadeIn 0.2s ease}
@media (max-width:992px){.nav-links{display:none}.mobile-toggle{display:flex}.footer-cols{grid-template-columns:1fr 1fr}.tools-dropdown-menu{width:100%;left:0}.side-by-side-grid{grid-template-columns:1fr}}
@media (max-width:640px){.nav-inner{height:60px}.hero-section{padding:32px 0 20px}.calc-nav-tabs{flex-direction:column}.tab-trigger{width:100%;justify-content:flex-start}.tab-panel{padding:20px 14px}.actions-bar,.export-toolbar{flex-direction:column;align-items:stretch}.actions-left,.actions-right,.export-buttons{width:100%}.btn{width:100%}.footer-cols{grid-template-columns:1fr}.cookie-banner{flex-direction:column;left:10px;right:10px;bottom:10px}.cookie-actions{width:100%}}