:root{--color-background: #1a1625;--color-surface: #251f33;--color-border: #3d3452;--color-primary: #a855f7;--color-primary-glow: rgba(168, 85, 247, .3);--color-secondary: #fb923c;--color-secondary-glow: rgba(251, 146, 60, .3);--color-text-primary: #f4f4f5;--color-text-secondary: #a1a1aa;--color-text-muted: #71717a;--color-disabled: #52525b;--color-disabled-bg: #27272a;--font-mono: "JetBrains Mono", monospace;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--max-width: 700px;--card-max-width: 600px;--card-padding: 48px;--border-radius: 16px;--border-radius-sm: 8px;--transition-fast: .15s ease;--transition-normal: .3s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--color-background);color:var(--color-text-primary);line-height:1.6;min-height:100vh}#app{min-height:100vh;display:flex;flex-direction:column}.header{padding:20px 24px;position:sticky;top:0;z-index:100;background:linear-gradient(to bottom,var(--color-background) 80%,transparent)}.header-content{max-width:var(--max-width);margin:0 auto;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--color-text-primary);font-family:var(--font-mono);font-size:24px;font-weight:700}.logo-icon{width:64px;height:64px}.nav{display:flex;align-items:center;gap:24px}.nav-link{background:none;border:none;color:var(--color-text-secondary);font-family:var(--font-sans);font-size:14px;text-decoration:none;cursor:pointer;transition:color var(--transition-fast);display:flex;align-items:center;gap:4px}.nav-link:hover{color:var(--color-text-primary)}.nav-link-external svg{opacity:.7}.lang-switcher{display:flex;gap:4px;background:var(--color-surface);padding:4px;border-radius:var(--border-radius-sm)}.lang-btn{background:none;border:none;color:var(--color-text-muted);font-family:var(--font-mono);font-size:12px;font-weight:500;padding:6px 10px;border-radius:4px;cursor:pointer;transition:all var(--transition-fast)}.lang-btn:hover{color:var(--color-text-secondary)}.lang-btn.active{background:var(--color-primary);color:var(--color-text-primary)}.hero{text-align:center;padding:32px 24px 24px;max-width:var(--max-width);margin:0 auto}.hero-headline{font-family:var(--font-mono);font-size:48px;font-weight:700;line-height:1.1;margin-bottom:16px}.hero-headline span{display:block}.hero-headline span:first-child{color:var(--color-primary)}.hero-subheadline{font-size:18px;color:var(--color-text-secondary)}.calculator-section{display:flex;flex-direction:column;align-items:center;padding:0 24px 24px;gap:24px}.calculator-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:var(--card-padding);width:100%;max-width:var(--card-max-width);position:relative}.calculator-card:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border-radius:var(--border-radius);padding:1px;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.3;pointer-events:none}.step-question{display:flex;align-items:center;gap:8px;position:relative}.step-question>span{font-size:16px;font-weight:500;color:var(--color-text-primary)}.tooltip-trigger{background:none;border:none;color:var(--color-text-muted);cursor:pointer;padding:2px;display:flex;align-items:center;justify-content:center;transition:color var(--transition-fast)}.tooltip-trigger:hover{color:var(--color-text-secondary)}.tooltip{position:absolute;left:0;top:calc(100% + 8px);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius-sm);padding:12px 16px;font-size:14px;color:var(--color-text-secondary);white-space:pre-line;z-index:50;width:280px;box-shadow:0 4px 20px #0000004d;opacity:0;visibility:hidden;transform:translateY(-4px);transition:all var(--transition-fast)}.tooltip-trigger:hover+.tooltip,.tooltip-trigger:focus+.tooltip{opacity:1;visibility:visible;transform:translateY(0)}.step{display:flex;flex-direction:column;gap:16px}.step-header{display:flex;flex-direction:column;gap:8px}.step-label{font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--color-text-muted);letter-spacing:.1em;text-transform:uppercase}.step-question{font-size:16px;font-weight:500;color:var(--color-text-primary)}.step-divider{height:1px;background:var(--color-border);margin:24px 0}.options{display:flex;gap:12px}.option-btn{flex:1;padding:12px 16px;background:transparent;border:1px solid var(--color-border);border-radius:var(--border-radius-sm);color:var(--color-text-secondary);font-family:var(--font-sans);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.option-btn:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-text-primary);box-shadow:0 0 20px var(--color-primary-glow)}.option-btn.selected{background:var(--color-primary);border-color:var(--color-primary);color:var(--color-text-primary);box-shadow:0 0 20px var(--color-primary-glow)}.option-btn:disabled{background:var(--color-disabled-bg);border-color:var(--color-disabled-bg);color:var(--color-disabled);cursor:not-allowed}.option-btn:disabled:hover{box-shadow:none}.result-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:var(--card-padding);width:100%;max-width:var(--card-max-width);text-align:center;display:none;flex-direction:column;align-items:center;gap:8px;position:relative}.result-card.visible{display:flex}.result-card:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border-radius:var(--border-radius);padding:1px;background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-primary) 100%);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.4;pointer-events:none}.result-label{font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--color-text-muted);letter-spacing:.1em;text-transform:uppercase}.result-number{font-family:var(--font-mono);font-size:72px;font-weight:700;color:var(--color-secondary);line-height:1;text-shadow:0 0 40px var(--color-secondary-glow)}.result-unit{font-size:16px;color:var(--color-text-secondary);margin-bottom:16px}.result-summary{display:flex;gap:24px;margin-bottom:24px;padding:16px 24px;background:#0003;border-radius:var(--border-radius-sm)}.result-summary-item{display:flex;flex-direction:column;gap:4px;text-align:center}.result-summary-label{font-size:11px;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.05em}.result-summary-value{font-family:var(--font-mono);font-size:14px;font-weight:500;color:var(--color-primary)}.calculator-card.hidden{display:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--border-radius-sm);font-family:var(--font-sans);font-size:14px;font-weight:500;text-decoration:none;cursor:pointer;transition:all var(--transition-fast)}.btn-primary{background:var(--color-primary);border:1px solid var(--color-primary);color:var(--color-text-primary)}.btn-primary:hover{box-shadow:0 0 20px var(--color-primary-glow)}.btn-secondary{background:transparent;border:1px solid var(--color-secondary);color:var(--color-secondary)}.btn-secondary:hover,.btn-secondary.copied{background:var(--color-secondary);color:var(--color-background)}.btn-ghost{background:transparent;border:1px solid var(--color-border);color:var(--color-text-secondary)}.btn-ghost:hover{border-color:var(--color-text-secondary);color:var(--color-text-primary)}.teaser-section{text-align:center;padding:48px 24px 24px;max-width:var(--card-max-width);margin:24px auto 0;border-top:1px solid var(--color-border)}.teaser-headline{font-family:var(--font-mono);font-size:20px;font-weight:700;margin-bottom:12px;color:var(--color-text-primary)}.teaser-body{color:var(--color-text-secondary);margin-bottom:20px;line-height:1.6;font-size:15px}.teaser-link{display:inline-flex}.cta-section{text-align:center;padding:24px 24px 48px;max-width:var(--card-max-width);margin:0 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var(--color-border);border-radius:var(--border-radius);padding:32px;max-width:480px;width:100%;transform:translateY(20px);transition:transform var(--transition-normal)}.modal.open .modal-content{transform:translateY(0)}.modal-close{position:absolute;top:16px;right:16px;background:none;border:none;color:var(--color-text-muted);cursor:pointer;padding:4px;transition:color var(--transition-fast)}.modal-close:hover{color:var(--color-text-primary)}.modal-title{font-family:var(--font-mono);font-size:24px;font-weight:700;margin-bottom:16px;color:var(--color-primary)}.modal-intro{color:var(--color-text-secondary);margin-bottom:24px}.modal-dimensions{display:flex;flex-direction:column;gap:20px;margin-bottom:24px}.modal-dimension h4{font-family:var(--font-mono);font-size:14px;font-weight:700;margin-bottom:4px;color:var(--color-text-primary)}.modal-dimension p{font-size:14px;color:var(--color-text-secondary)}.modal-outro{font-size:14px;color:var(--color-text-muted);font-style:italic;margin-bottom:24px}.modal-close-btn{width:100%}@media (max-width: 768px){:root{--card-padding: 24px}.header{padding:16px 20px}.logo{font-size:20px}.logo-icon{width:56px;height:56px}.nav{gap:16px}.nav-link{font-size:13px}.hero{padding:24px 20px 20px}.hero-headline{font-size:36px}.hero-subheadline{font-size:16px}.calculator-section{padding:0 20px 20px}.step-question>span{font-size:15px}.step-question{font-size:15px}.options{gap:8px}.option-btn{padding:10px 12px;font-size:13px}.result-number{font-size:56px}.result-summary{gap:16px;padding:12px 16px}.cta-section{padding:20px 20px 32px}.cta-headline{font-size:20px}.modal-content{padding:24px}}@media (max-width: 400px){.options{flex-direction:column}.option-btn{width:100%}.result-summary{flex-direction:column;gap:12px}}.breadcrumb{display:flex;align-items:center;gap:8px;padding:16px 24px;max-width:900px;margin:0 auto;font-size:14px}.breadcrumb-link{color:var(--color-text-muted);text-decoration:none;transition:color var(--transition-fast)}.breadcrumb-link:hover{color:var(--color-primary)}.breadcrumb-separator{color:var(--color-text-muted);display:flex;align-items:center}.breadcrumb-current{color:var(--color-text-secondary)}.guide-content{padding:0 24px 48px;max-width:900px;margin:0 auto}.guide-article{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:48px;position:relative}.guide-article:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border-radius:var(--border-radius);padding:1px;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.2;pointer-events:none}.guide-title{font-family:var(--font-mono);font-size:28px;font-weight:700;line-height:1.3;margin-bottom:24px;color:var(--color-primary)}.guide-intro{font-size:18px;line-height:1.7;color:var(--color-text-secondary);margin-bottom:32px;padding-bottom:32px;border-bottom:1px solid var(--color-border)}.guide-toc{background:#0003;border-radius:var(--border-radius-sm);padding:24px;margin-bottom:40px}.guide-toc-title{font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--color-text-muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:16px}.guide-toc-list{list-style:none;counter-reset:toc-counter;display:flex;flex-direction:column;gap:12px}.guide-toc-list li{counter-increment:toc-counter}.guide-toc-list a{color:var(--color-text-secondary);text-decoration:none;font-size:15px;transition:color var(--transition-fast);display:flex;align-items:baseline;gap:12px}.guide-toc-list a:before{content:counter(toc-counter) ".";font-family:var(--font-mono);font-size:14px;color:var(--color-text-muted);min-width:20px}.guide-toc-list a:hover{color:var(--color-primary)}.guide-section{margin-bottom:40px}.guide-section:last-of-type{margin-bottom:48px}.guide-section h2{font-family:var(--font-mono);font-size:20px;font-weight:700;color:var(--color-text-primary);margin-bottom:20px;padding-top:8px}.guide-section p{font-size:16px;line-height:1.75;color:var(--color-text-secondary);margin-bottom:16px}.guide-section p:last-child{margin-bottom:0}.guide-section em{font-style:italic;color:var(--color-primary)}.guide-section strong{font-weight:600;color:var(--color-text-primary)}.guide-list{margin:20px 0;padding-left:24px}.guide-list li{font-size:16px;line-height:1.75;color:var(--color-text-secondary);margin-bottom:12px}.guide-list li:last-child{margin-bottom:0}.guide-list li strong{color:var(--color-text-primary)}ol.guide-list{list-style-type:decimal}ul.guide-list{list-style-type:disc}.guide-cta{padding-top:32px;border-top:1px solid var(--color-border);display:flex;justify-content:center}@media (max-width: 768px){.guide-article{padding:32px 24px}.guide-title{font-size:22px}.guide-intro{font-size:16px}.guide-toc{padding:20px}.guide-section h2{font-size:18px}.guide-section p,.guide-list li{font-size:15px}.teaser-section{padding:32px 20px 20px}.teaser-headline{font-size:18px}.teaser-body{font-size:14px}}