/* ================================================================
   SAT QR Code Generator — sat.qc.ca aesthetic
   DM Sans · Black + White + SAT Accent Colors · 19px Radius · Bold
   ================================================================ */

:root {
  --sat-black:      #000000;
  --sat-white:      #ffffff;
  --sat-red:        #ed1c24;
  --sat-green:      #1ced7c;
  --sat-blue:       #4a46ff;
  --sat-purple:     #D20EE3;
  --sat-orange:     #FB7D4C;
  --sat-grey:       #434343;
  --gray-100:       #f5f5f5;
  --gray-200:       #e5e5e5;
  --gray-300:       #d4d4d4;
  --gray-400:       #a3a3a3;
  --gray-500:       #737373;
  --gray-600:       #525252;
  --gray-700:       #404040;
  --gray-800:       #262626;
  --gray-900:       #171717;

  --font:           'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --br-main:        19px;
  --radius:         8px;
  --radius-lg:      16px;
  --nav-height:     70px;
  --ease:           cubic-bezier(.25,.1,.25,1);

  /* Theme colors — dark default */
  --bg-primary:     var(--sat-black);
  --bg-secondary:   var(--sat-white);
  --text-primary:   var(--sat-white);
  --text-secondary: var(--sat-black);
  --header-bg:      rgba(0,0,0,.85);
  --input-bg:       var(--sat-white);
  --input-border:   var(--gray-200);
  --input-text:     var(--sat-black);
  --tab-bg:         var(--gray-100);
  --tab-border:     var(--gray-200);
  --tab-active-bg:  var(--sat-black);
  --tab-active-text:var(--sat-white);
  --card-bg:        var(--sat-white);
  --card-border:    var(--gray-200);
  --accent:         var(--sat-green);
}

:root.light {
  --bg-primary:     var(--sat-white);
  --bg-secondary:   #fafafa;
  --text-primary:   var(--sat-black);
  --text-secondary: var(--sat-black);
  --header-bg:      rgba(255,255,255,.85);
  --input-bg:       var(--sat-white);
  --input-border:   var(--gray-300);
  --input-text:     var(--sat-black);
  --tab-bg:         var(--gray-100);
  --tab-border:     var(--gray-300);
  --tab-active-bg:  var(--sat-black);
  --tab-active-text:var(--sat-white);
  --card-bg:        var(--sat-white);
  --card-border:    var(--gray-200);
  --accent:         var(--sat-blue);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);font-size:16px;line-height:1.5;color:var(--sat-black);background:var(--sat-white);overflow-x:hidden;-webkit-font-smoothing:antialiased;transition:background .36s var(--ease),color .36s var(--ease)}
:root.light body{background:var(--sat-white);color:var(--sat-black)}
::selection{background:var(--sat-black);color:var(--sat-white)}
:root.light ::selection{background:var(--sat-blue);color:var(--sat-white)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== HEADER — SAT style ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-height);
  background:var(--header-bg);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.06);
  transition:all .36s var(--ease);
}
:root.light .site-header{border-bottom-color:var(--gray-200)}

.nav{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;max-width:1200px;margin:0 auto;padding:0 24px;
}

/* SAT Logo image */
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-logo-img{
  height:36px;width:auto;
  border-radius:6px;
  transition:all .2s var(--ease);
  display:block;
}
.brand:hover .brand-logo-img{transform:scale(1.03);opacity:.9}

.header-center{display:flex;align-items:center;gap:6px}

.nav-link{
  font-size:13px;font-weight:600;color:rgba(255,255,255,.5);
  padding:6px 16px;border-radius:var(--br-main);
  transition:all .2s var(--ease);letter-spacing:.02em;
}
:root.light .nav-link{color:var(--gray-500)}
.nav-link:hover{color:var(--sat-white);background:rgba(255,255,255,.1)}
:root.light .nav-link:hover{color:var(--sat-black);background:var(--gray-100)}
.nav-link.active{color:var(--sat-white);background:rgba(255,255,255,.15)}
:root.light .nav-link.active{color:var(--sat-black);background:var(--gray-200)}

.header-right{display:flex;align-items:center;gap:8px}

/* Language toggle — SAT pill style */
.lang-toggle{
  font-size:12px;font-weight:700;font-family:var(--font);
  padding:5px 12px;border-radius:var(--br-main);
  background:var(--sat-white);color:var(--sat-black);
  border:none;cursor:pointer;
  transition:all .2s var(--ease);
  letter-spacing:.03em;
}
:root.light .lang-toggle{background:var(--sat-black);color:var(--sat-white)}
.lang-toggle:hover{transform:scale(1.05)}

/* Theme toggle */
.theme-toggle{
  width:36px;height:36px;border-radius:var(--br-main);
  background:rgba(255,255,255,.1);border:none;
  color:var(--sat-white);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:all .2s var(--ease);
}
:root.light .theme-toggle{background:var(--gray-100);color:var(--sat-black)}
:root.light .theme-toggle:hover{background:var(--gray-200)}
:root:not(.light) .theme-toggle:hover{background:rgba(255,255,255,.2)}

.icon-sun{display:none}
:root.light .icon-sun{display:block}
:root.light .icon-moon{display:none}
:root:not(.light) .icon-moon{display:block}

/* ===== HERO — SAT black bg ===== */
.hero{
  background:var(--sat-black);
  min-height:42vh;
  display:flex;align-items:center;justify-content:center;
  text-align:center;
  padding:calc(var(--nav-height) + 40px) 24px 60px;
  position:relative;
  overflow:hidden;
}

/* SAT accent line at top of hero */
.hero::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg, var(--sat-red), var(--sat-orange), var(--sat-green), var(--sat-blue), var(--sat-purple));
}

.hero-content{max-width:800px;position:relative;z-index:1}
.hero h1{
  font-size:clamp(40px,8vw,82px);
  font-weight:700;
  line-height:.95;
  letter-spacing:-.03em;
  color:var(--sat-white);
  margin-bottom:20px;
}
.hero-lead{
  font-size:clamp(16px,2vw,20px);
  color:rgba(255,255,255,.6);
  max-width:560px;
  margin:0 auto;
  line-height:1.6;
  font-weight:400;
}

/* ===== TOOL SECTION ===== */
.tool-section{
  background:var(--sat-white);
  padding:60px 0 80px;
  transition:background .36s var(--ease);
}
:root.light .tool-section{background:var(--sat-white)}

/* ===== TOOL LAYOUT ===== */
.tool-layout{
  display:grid;
  grid-template-columns:1fr;
  gap:40px;
  max-width:1100px;
  margin:0 auto;
}
@media(min-width:900px){.tool-layout{grid-template-columns:1.1fr .9fr}}

/* ===== OPTIONS PANEL ===== */
.options-panel{overflow-y:auto;max-height:none}
@media(min-width:900px){.options-panel{max-height:calc(100vh - 140px)}}

.option-group{margin-bottom:18px}
.option-group:last-child{margin-bottom:0}
.option-label{
  display:block;font-size:11px;font-weight:600;
  color:var(--gray-500);text-transform:uppercase;
  letter-spacing:.08em;margin-bottom:6px;
}

.tool-input{
  width:100%;padding:10px 14px;
  border:1px solid var(--input-border);border-radius:var(--radius);
  background:var(--input-bg);color:var(--input-text);
  font-family:var(--font);font-size:15px;
  transition:all .2s var(--ease);resize:vertical;
}
.tool-input:focus{
  outline:none;border-color:var(--sat-black);
  box-shadow:0 0 0 3px rgba(0,0,0,.08);
}
:root.light .tool-input:focus{border-color:var(--sat-blue);box-shadow:0 0 0 3px rgba(74,70,255,.1)}
.tool-input::placeholder{color:var(--gray-400)}

/* Type tabs — SAT 19px pill */
.type-tabs{display:flex;flex-wrap:wrap;gap:5px}
.type-tab{
  padding:6px 14px;border-radius:var(--br-main);
  font-size:12px;font-weight:600;font-family:var(--font);
  background:var(--tab-bg);border:1px solid var(--tab-border);
  color:var(--gray-600);cursor:pointer;
  transition:all .2s var(--ease);letter-spacing:.01em;
}
.type-tab:hover{background:var(--gray-200);border-color:var(--gray-300);color:var(--sat-black)}
.type-tab.active{background:var(--sat-black);color:var(--sat-white);border-color:var(--sat-black)}
:root.light .type-tab.active{background:var(--sat-black);color:var(--sat-white);border-color:var(--sat-black)}

.option-divider{border:0;border-top:1px solid var(--gray-200);margin:18px 0}

/* Color row */
.color-row{display:flex;align-items:center;gap:8px}
.color-picker{width:36px;height:32px;border:1px solid var(--gray-200);border-radius:var(--radius);cursor:pointer;background:0;padding:2px;flex-shrink:0}
.color-picker::-webkit-color-swatch-wrapper{padding:0}
.color-picker::-webkit-color-swatch{border-radius:4px;border:0}
.color-hex{width:90px!important;flex-shrink:0;font-family:var(--font)!important;font-size:12px!important;padding:8px 10px!important}

/* Transparent toggle */
.toggle-transparent{font-size:10px!important;padding:5px 10px!important;white-space:nowrap}
.toggle-transparent.active{background:var(--sat-black);color:var(--sat-white);border-color:var(--sat-black)}

/* Image upload */
.image-upload-row{display:flex;gap:8px;flex-wrap:wrap}
.logo-preview-img{width:48px;height:48px;border-radius:var(--radius);object-fit:cover;border:1px solid var(--gray-200)}

/* Range */
.tool-range{width:100%;height:4px;border-radius:2px;background:var(--gray-200);-webkit-appearance:none;appearance:none;outline:none;cursor:pointer}
.tool-range::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--sat-black);cursor:pointer;border:2px solid var(--sat-white);box-shadow:0 1px 4px rgba(0,0,0,.2)}
.tool-range::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--sat-black);cursor:pointer;border:2px solid var(--sat-white)}
.range-value{font-size:11px;color:var(--gray-500);font-family:var(--font);margin-top:4px;text-align:right}

/* EC hint */
.ec-hint{font-size:11px;color:var(--gray-500);margin-top:6px;line-height:1.4}

/* ===== BUTTONS — SAT style, 19px radius ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:8px 20px;border-radius:var(--br-main);
  font-size:13px;font-weight:600;border:none;cursor:pointer;
  transition:all .2s var(--ease);font-family:var(--font);
  min-height:36px;letter-spacing:.01em;
}

/* SAT primary button — white bg + black text (like sat.qc.ca BILLETS) */
.btn-sat{background:var(--sat-white);color:var(--sat-black)}
.btn-sat:hover{background:var(--gray-100);transform:scale(1.02)}
:root.light .btn-sat{background:var(--sat-black);color:var(--sat-white)}
:root.light .btn-sat:hover{background:var(--gray-800)}

/* Green accent variant */
.btn-green{background:var(--sat-green);color:var(--sat-black)}
.btn-green:hover{filter:brightness(1.1);transform:scale(1.02)}

.btn-outline{background:transparent;color:var(--sat-black);border:1px solid var(--gray-300)}
.btn-outline:hover{border-color:var(--sat-black);background:var(--gray-100)}
.btn-sm{padding:6px 14px!important;font-size:12px!important;min-height:30px!important}
.btn-block{width:100%;justify-content:center;margin-top:4px}

/* ===== PREVIEW PANEL ===== */
.preview-panel{display:flex;flex-direction:column;align-items:center;position:sticky;top:calc(var(--nav-height) + 10px)}
@media(max-width:899px){.preview-panel{position:static}}
.preview-label{
  font-size:11px;font-weight:600;color:var(--gray-500);
  text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px;
}

.qr-preview-wrap{
  background:var(--sat-white);
  border:1px solid var(--gray-200);
  border-radius:var(--radius-lg);
  padding:16px;
  margin-bottom:24px;
  line-height:0;
  overflow:hidden;
  display:flex;align-items:center;justify-content:center;
  position:relative;
}
.qr-preview-wrap.transparent-bg{
  background:repeating-conic-gradient(var(--gray-200) 0% 25%, var(--sat-white) 0% 50%) 50%/16px 16px;
  border:1px solid var(--gray-300);
}

#qr-container{line-height:0}
#qr-container canvas,#qr-container svg{max-width:100%!important;height:auto!important;display:block}

.preview-actions{display:flex;flex-wrap:wrap;gap:8px;width:100%;justify-content:center}
.action-feedback{font-size:13px;font-weight:500;color:var(--sat-black);margin-top:10px;min-height:20px}

/* ===== INFO SECTION — Black bg with accent line ===== */
.info-section{
  background:var(--sat-black);
  padding:40px 0;
  text-align:center;
  position:relative;
}
.info-section::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg, var(--sat-green), var(--sat-blue));
}
.info-text{
  font-size:14px;
  color:rgba(255,255,255,.5);
  font-weight:400;
}

/* ===== FOOTER — SAT style ===== */
.site-footer{
  background:var(--sat-black);
  padding:32px 0;
  border-top:1px solid rgba(255,255,255,.1);
}
.foot{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:16px;
}
.foot p{font-size:12px;color:rgba(255,255,255,.4)}
.foot p a{transition:color .2s}
.foot p a:hover{color:var(--sat-green)}
.foot-nav{display:flex;gap:16px;flex-wrap:wrap}
.foot-nav a{font-size:12px;color:rgba(255,255,255,.4);transition:color .2s}
.foot-nav a:hover{color:var(--sat-green)}

/* ===== RESPONSIVE ===== */
@media(max-width:899px){
  .hero{padding:calc(var(--nav-height) + 20px) 20px 40px;min-height:auto}
  .hero h1{font-size:clamp(36px,10vw,52px)}
  .tool-section{padding:40px 0 60px}
  .preview-actions{flex-direction:column}
  .preview-actions .btn{width:100%;justify-content:center}
  .header-center{display:none}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .type-tabs{gap:4px}
  .type-tab{padding:4px 10px;font-size:10px}
  .nav{padding:0 16px}
}

@media(prefers-reduced-motion:reduce){
  *{transition-duration:0ms!important;animation-duration:0ms!important}
}
:focus-visible{outline:2px solid var(--sat-blue);outline-offset:2px}