:root{--primary:#2563EB;--secondary:#1E40AF;--accent:#10B981;--accent-hover:#059669;--bg:#F8FAFC;--surface:#FFFFFF;--text:#1E293B;--muted:#64748B;--border:#E2E8F0;--shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);--shadow-lg:0 10px 25px -5px rgba(0,0,0,.08),0 8px 10px -6px rgba(0,0,0,.04);--radius:8px;--radius-sm:6px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg,canvas{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 1.25rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:700;font-size:1.15rem;color:var(--text);display:flex;align-items:center;gap:.5rem}
.logo-mark{width:28px;height:28px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:6px;display:inline-block}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:.5rem;color:var(--text)}
.nav-toggle svg{width:24px;height:24px}
.main-nav ul{display:flex;gap:1.75rem;list-style:none;align-items:center}
.main-nav a{color:var(--text);font-weight:500;font-size:.95rem}
.main-nav a:hover{color:var(--primary);text-decoration:none}
.main-nav a.cta{background:var(--accent);color:#fff;padding:.5rem 1rem;border-radius:var(--radius-sm);transition:background .15s}
.main-nav a.cta:hover{background:var(--accent-hover)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:inherit;font-weight:600;font-size:1rem;padding:.85rem 1.5rem;border-radius:var(--radius-sm);border:0;cursor:pointer;transition:transform .15s,background .15s,box-shadow .15s;text-decoration:none}
.btn:hover{transform:translateY(-1px);text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--secondary);color:#fff}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-hover);color:#fff}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-sm{padding:.55rem 1rem;font-size:.875rem}

/* Hero */
.hero{padding:5rem 0 4rem;background:linear-gradient(180deg,#EFF6FF 0%,var(--bg) 100%)}
.hero-inner{text-align:center;max-width:820px;margin:0 auto}
.hero h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.15;font-weight:700;color:var(--text);margin-bottom:1.25rem}
.hero h1 span{background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:1.2rem;color:var(--muted);margin-bottom:2rem}
.hero-cta{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}

/* Sections */
section{padding:4rem 0}
.section-title{text-align:center;font-size:2rem;font-weight:700;margin-bottom:.75rem}
.section-sub{text-align:center;color:var(--muted);margin-bottom:3rem;max-width:640px;margin-left:auto;margin-right:auto}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem}
.feature-card{background:var(--surface);padding:1.75rem;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.feature-icon{width:48px;height:48px;background:#DBEAFE;color:var(--primary);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;margin-bottom:1rem;font-size:1.5rem;font-weight:700}
.feature-card h3{font-size:1.15rem;margin-bottom:.5rem}
.feature-card p{color:var(--muted);font-size:.95rem}

/* Steps */
.steps{background:var(--surface)}
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:2rem}
.step{text-align:center;padding:1rem}
.step-num{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin:0 auto 1rem}
.step h3{margin-bottom:.5rem}
.step p{color:var(--muted)}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:.75rem;overflow:hidden}
.faq-item summary{padding:1.25rem 1.5rem;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--primary);transition:transform .2s}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 1.5rem 1.25rem;color:var(--muted)}

/* Footer */
.site-footer{background:#0F172A;color:#CBD5E1;padding:3rem 0 1.5rem;margin-top:4rem}
.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:2rem;margin-bottom:2rem}
.footer-col h4{color:#fff;margin-bottom:1rem;font-size:1rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:.5rem}
.footer-col a{color:#CBD5E1;font-size:.9rem}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1E293B;padding-top:1.5rem;text-align:center;font-size:.85rem;color:#94A3B8}
.footer-desc{font-size:.9rem;line-height:1.6;margin-top:.75rem;color:#94A3B8}

/* Breadcrumbs */
.breadcrumbs{padding:1rem 0;font-size:.875rem;color:var(--muted)}
.breadcrumbs ol{list-style:none;display:flex;gap:.5rem;flex-wrap:wrap}
.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:.5rem;color:var(--border)}

/* Generator layout */
.tool-page{padding:2rem 0 4rem}
.tool-page h1{font-size:clamp(1.75rem,4vw,2.5rem);margin-bottom:.75rem}
.tool-page>.container>p.lead{color:var(--muted);margin-bottom:2rem;font-size:1.1rem;max-width:780px}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
@media(max-width:900px){.tool-grid{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow)}
.panel h2{font-size:1.25rem;margin-bottom:1.25rem}

/* Tabs */
.tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.5rem;border-bottom:1px solid var(--border);padding-bottom:.5rem}
.tab{background:transparent;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.5rem 1rem;font-family:inherit;font-size:.875rem;font-weight:500;cursor:pointer;color:var(--muted);transition:all .15s}
.tab:hover{color:var(--primary);border-color:var(--primary)}
.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Forms */
.field{margin-bottom:1rem}
.field label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.4rem;color:var(--text)}
.field input[type=text],.field input[type=url],.field input[type=email],.field input[type=tel],.field input[type=number],.field textarea,.field select{width:100%;padding:.65rem .85rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:.95rem;background:#fff;color:var(--text);transition:border-color .15s,box-shadow .15s}
.field input:focus,.field textarea:focus,.field select:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.field textarea{resize:vertical;min-height:90px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media(max-width:500px){.field-row{grid-template-columns:1fr}}
.field input[type=color]{width:100%;height:42px;padding:.2rem;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;background:#fff}
.checkbox-field{display:flex;align-items:center;gap:.5rem}
.checkbox-field input{width:auto}

/* Preview */
.preview-box{display:flex;align-items:center;justify-content:center;min-height:280px;background:#fff;border:2px dashed var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:1.25rem}
.preview-box canvas,.preview-box svg,.preview-box img{max-width:100%;max-height:340px}
.download-row{display:flex;gap:.75rem;flex-wrap:wrap}

/* Bulk grid */
.bulk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:1rem;margin-top:1.25rem}
.bulk-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.75rem;text-align:center}
.bulk-item canvas{margin:0 auto}
.bulk-item .label{font-size:.75rem;color:var(--muted);margin-top:.5rem;word-break:break-all;max-height:32px;overflow:hidden}

/* Spinner */
.spinner{display:inline-block;width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* Mobile nav */
@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);padding:1rem 1.25rem;display:none;box-shadow:var(--shadow-lg)}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;gap:.75rem;align-items:stretch}
  .main-nav a{padding:.65rem 0;display:block}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero{padding:3rem 0}
}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}

/* Content pages */
.content-page{padding:3rem 0;max-width:780px;margin:0 auto}
.content-page h1{font-size:2.25rem;margin-bottom:1.25rem}
.content-page h2{font-size:1.5rem;margin:2rem 0 .75rem}
.content-page p{margin-bottom:1rem;color:var(--text)}
.content-page ul{margin:0 0 1rem 1.5rem}
.content-page li{margin-bottom:.4rem}

/* ============ Advanced QR Generator ============ */
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border)}
.btn-ghost:hover{color:var(--text);background:#F1F5F9}

/* Templates bar */
.templates-bar{margin-bottom:1.5rem}
.tb-title{font-size:.95rem;font-weight:600;color:var(--muted);margin-bottom:.6rem;text-transform:uppercase;letter-spacing:.05em}
.templates-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:.6rem}
.tpl{display:flex;align-items:center;gap:.5rem;padding:.55rem .75rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:.85rem;font-weight:500;color:var(--text);cursor:pointer;transition:all .15s}
.tpl:hover{border-color:var(--primary);transform:translateY(-1px)}
.tpl-swatch{width:18px;height:18px;border-radius:4px;flex-shrink:0;border:1px solid rgba(0,0,0,.1)}

/* Layout */
.qr-layout{display:grid;grid-template-columns:1.2fr .9fr;gap:1.5rem;align-items:start}
@media(max-width:960px){.qr-layout{grid-template-columns:1fr}}

.qr-options{display:flex;flex-direction:column;gap:.85rem}

/* Accordion */
.acc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.acc summary{list-style:none;padding:1.1rem 1.4rem;cursor:pointer;font-weight:600;font-size:1.05rem;display:flex;align-items:center;gap:.75rem;user-select:none}
.acc summary::-webkit-details-marker{display:none}
.acc-num{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-size:.85rem;font-weight:700;flex-shrink:0}
.acc-icon{margin-left:auto;width:20px;height:20px;position:relative;flex-shrink:0}
.acc-icon::before,.acc-icon::after{content:"";position:absolute;background:var(--muted);top:50%;left:50%;transform:translate(-50%,-50%);transition:transform .2s}
.acc-icon::before{width:12px;height:2px}
.acc-icon::after{width:2px;height:12px}
.acc[open] .acc-icon::after{transform:translate(-50%,-50%) scaleY(0)}
.acc-body{padding:0 1.4rem 1.4rem;border-top:1px solid var(--border)}
.acc-body>:first-child{margin-top:1.1rem}

/* Sticky preview */
.qr-preview-wrap{position:sticky;top:80px}
.preview-panel h2{font-size:1.1rem;margin-bottom:1rem}
.preview-frame{position:relative;display:flex;align-items:center;justify-content:center;padding:1rem;background:#fff;border-radius:var(--radius);transition:all .2s}
.preview-checker{background-image:linear-gradient(45deg,#E2E8F0 25%,transparent 25%),linear-gradient(-45deg,#E2E8F0 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#E2E8F0 75%),linear-gradient(-45deg,transparent 75%,#E2E8F0 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0;padding:.5rem;border-radius:6px;display:inline-block}
#qr-canvas{display:flex;align-items:center;justify-content:center}
#qr-canvas canvas,#qr-canvas svg{max-width:100%;height:auto;display:block}
.preview-meta{text-align:center;color:var(--muted);font-size:.85rem;margin:.75rem 0 1rem}

/* Frame styles (preview only — download composes via canvas) */
.preview-frame.frame-simple{border:4px solid var(--frame-color);border-radius:0;padding:1.25rem}
.preview-frame.frame-rounded{border:4px solid var(--frame-color);border-radius:18px;padding:1.25rem}
.preview-frame.frame-scanme,.preview-frame.frame-custom{border:4px solid var(--frame-color);border-radius:12px;padding:1.25rem 1.25rem 3rem}
.frame-label{position:absolute;left:1.25rem;right:1.25rem;bottom:.6rem;color:#fff;text-align:center;font-weight:700;letter-spacing:.05em;padding:.4rem;border-radius:6px;font-size:.95rem}

/* Tabs */
.tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1.25rem;border-bottom:1px solid var(--border);padding-bottom:.5rem}

/* Visual thumb selectors */
.thumb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:.55rem}
.thumb{display:flex;flex-direction:column;align-items:center;gap:.3rem;padding:.5rem .35rem;background:#fff;border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-family:inherit;font-size:.7rem;font-weight:500;color:var(--muted);transition:all .15s}
.thumb svg{display:block;border-radius:4px}
.thumb:hover{transform:scale(1.04);border-color:var(--primary)}
.thumb.active{border-color:var(--primary);color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}

/* Swatches */
.swatches{display:flex;gap:.35rem;flex-wrap:wrap;margin-top:.5rem}
.swatch{width:24px;height:24px;border-radius:6px;border:2px solid var(--border);cursor:pointer;padding:0;transition:transform .15s}
.swatch:hover{transform:scale(1.15);border-color:var(--primary)}

/* Color groups */
.color-group{padding:.85rem 0;border-bottom:1px solid var(--border)}
.color-group:last-child{border-bottom:0}
.color-group-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem;flex-wrap:wrap;gap:.5rem}
.color-group-head strong{font-size:.9rem}
.gradient-controls{margin-top:.5rem;padding:.75rem;background:#F1F5F9;border-radius:var(--radius-sm)}

/* Logo upload + gallery */
.upload-row{display:flex;align-items:center;gap:.65rem;flex-wrap:wrap}
.upload-name{font-size:.85rem;color:var(--muted)}
.logo-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:.45rem;margin-top:.5rem}
.logo-tile{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.4rem;cursor:pointer;transition:all .15s}
.logo-tile:hover{border-color:var(--primary);transform:scale(1.08);background:#EFF6FF}
.logo-tile svg{width:100%;height:100%;display:block}

/* Range input */
input[type=range]{width:100%;accent-color:var(--primary)}

/* Download row */
.preview-panel .download-row{margin-top:.75rem}
.preview-panel .download-row .btn{flex:1}

/* ============ i18n: language switcher + RTL ============ */
.lang-switch-host{display:flex;align-items:center}
.lang-select{appearance:none;-webkit-appearance:none;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%2364748B' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E") no-repeat right .55rem center;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.45rem 1.6rem .45rem .65rem;font-family:inherit;font-size:.85rem;font-weight:500;color:var(--text);cursor:pointer;max-width:140px;transition:border-color .15s,box-shadow .15s}
.lang-select:hover{border-color:var(--primary)}
.lang-select:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
@media(max-width:768px){.lang-switch-host{padding:.5rem 0}.lang-select{max-width:100%;width:100%}}

/* RTL support */
html[dir=rtl] body{direction:rtl;text-align:right}
html[dir=rtl] .main-nav ul{flex-direction:row-reverse}
html[dir=rtl] .breadcrumbs ol{flex-direction:row-reverse}
html[dir=rtl] .breadcrumbs li:not(:last-child)::after{margin-left:0;margin-right:.5rem}
html[dir=rtl] .acc summary{flex-direction:row-reverse}
html[dir=rtl] .acc-icon{margin-left:0;margin-right:auto}
html[dir=rtl] .footer-col ul{padding:0}
html[dir=rtl] .feature-card,html[dir=rtl] .step{text-align:right}
html[dir=rtl] .hero-inner,html[dir=rtl] .section-title,html[dir=rtl] .section-sub,html[dir=rtl] .step{text-align:center}
html[dir=rtl] .lang-select{background-position:left .55rem center;padding:.45rem .65rem .45rem 1.6rem}
html[dir=rtl] .faq-item summary{flex-direction:row-reverse}

/* Lighthouse / a11y fixes */
.feature-icon,.step-num{user-select:none}
img,svg{max-width:100%}
.btn:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,details:focus-visible{outline:3px solid rgba(37,99,235,.4);outline-offset:2px;border-radius:var(--radius-sm)}
.main-nav a{padding:.55rem .25rem;min-height:44px;display:inline-flex;align-items:center}
.faq-item summary{min-height:48px}
@media(max-width:768px){.main-nav a{min-height:48px;width:100%}}
/* Better contrast for muted text */
.section-sub,.feature-card p,.step p,.preview-meta,.hero p{color:#475569}