/* Fast-Lite JSON Tools - Enhanced Visual Design */
/* Optimized for user engagement and conversion */

/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  line-height:1.6;
  transition:all .3s ease;
  background:var(--bg);
  color:var(--text);
  overflow-x:hidden;
}

/* Enhanced CSS Variables */
:root{
  --primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#dbeafe;
  --secondary:#64748b;--secondary-hover:#475569;--secondary-light:#f1f5f9;
  --accent:#06b6d4;--accent-hover:#0891b2;--accent-light:#cffafe;
  --success:#10b981;--error:#ef4444;--warning:#f59e0b;
  --bg:#ffffff;--bg-alt:#f8fafc;--bg-card:#ffffff;
  --text:#1e293b;--text-muted:#64748b;--text-light:#94a3b8;
  --border:#e2e8f0;--border-light:#f1f5f9;
  --shadow:0 1px 3px rgba(0,0,0,.1);
  --shadow-lg:0 10px 25px rgba(0,0,0,.1);
  --shadow-xl:0 20px 40px rgba(0,0,0,.1);
  --radius:12px;--radius-sm:8px;--radius-lg:16px;
  --gradient-primary:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
  --gradient-hero:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
}

[data-theme="dark"]{
  --bg:#0f172a;--bg-alt:#1e293b;--bg-card:#1e293b;
  --text:#f1f5f9;--text-muted:#94a3b8;--text-light:#64748b;
  --border:#334155;--border-light:#475569;
  --shadow:0 1px 3px rgba(0,0,0,.3);
  --shadow-lg:0 10px 25px rgba(0,0,0,.2);
  --shadow-xl:0 20px 40px rgba(0,0,0,.2);
  --gradient-hero:linear-gradient(135deg,#1e3a8a 0%,#1e40af 100%);
}

/* Layout & Container */
.container{max-width:1200px;margin:0 auto;padding:0 1rem}
.main{min-height:calc(100vh - 200px)}

/* Enhanced Header */
.header{
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border-light);
  position:sticky;top:0;z-index:100;
  transition:all .3s ease;
}
[data-theme="dark"] .header{
  background:rgba(15,23,42,.95);
}
.header:hover{
  box-shadow:var(--shadow-lg);
}
.header .container{
  display:flex;align-items:center;justify-content:space-between;
  height:70px;
}
.logo{
  font-size:1.5rem;font-weight:800;
  background:var(--gradient-primary);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  display:flex;align-items:center;gap:.75rem;
  text-decoration:none;
  transition:transform .3s ease;
}
.logo:hover{transform:scale(1.05)}
.logo-icon{
  font-size:2rem;
  background:var(--gradient-primary);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  animation:pulse 2s infinite;
}

/* Enhanced Controls */
.lang-selector select,.theme-toggle{
  background:var(--bg-card);
  border:2px solid var(--border);
  border-radius:var(--radius-sm);
  padding:.75rem 1rem;
  color:var(--text);
  cursor:pointer;
  transition:all .3s ease;
  font-weight:500;
}
.lang-selector select:hover,.theme-toggle:hover{
  border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-light);
  transform:translateY(-1px);
}
.theme-toggle{
  font-size:1.2rem;width:50px;height:50px;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;
}

/* Hero Section */
.hero{
  text-align:center;padding:4rem 0;
  background:var(--gradient-hero);
  color:white;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1000 1000'%3e%3cpolygon fill='%23ffffff' fill-opacity='0.05' points='1000,0 1000,1000 0,1000'/%3e%3c/svg%3e");
  background-size:100% 100%;
}
.hero *{position:relative;z-index:1}
.hero-title{
  font-size:3rem;margin-bottom:1.5rem;font-weight:800;
  text-shadow:0 2px 4px rgba(0,0,0,.1);
  animation:slideInUp .8s ease;
}
.hero-description{
  font-size:1.25rem;max-width:700px;margin:0 auto 2rem auto;
  opacity:.95;
  animation:slideInUp .8s ease .2s both;
}

/* Tool Interface */
.tool-section{margin:3rem 0}
.upload-area{
  border:3px dashed var(--border);
  border-radius:var(--radius-lg);
  padding:3rem 2rem;
  text-align:center;
  cursor:pointer;
  transition:all .3s ease;
  margin-bottom:2rem;
  background:var(--bg-card);
}
.upload-area:hover,.upload-area.dragover{
  border-color:var(--primary);
  background:var(--primary-light);
  transform:translateY(-2px);
  box-shadow:var(--shadow-lg);
}
.upload-icon{font-size:4rem;margin-bottom:1rem;opacity:.7}
.upload-content p{font-size:1.1rem;color:var(--text-muted);font-weight:500}

.tool-interface{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:2rem;
  align-items:start;
}

/* Enhanced Panels */
.panel{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:all .3s ease;
}
.panel:hover{
  box-shadow:var(--shadow-lg);
  transform:translateY(-2px);
}
.panel-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:1.5rem;
  border-bottom:1px solid var(--border);
  background:var(--bg-alt);
}
.panel-header h3{font-size:1.1rem;color:var(--text);font-weight:600}
.panel-controls{display:flex;gap:.75rem}

/* Enhanced Inputs */
.json-input,.json-output{
  width:100%;height:450px;border:none;
  background:var(--bg-card);color:var(--text);
  font-family:'SF Mono','Monaco','Cascadia Code','Roboto Mono',monospace;
  font-size:14px;line-height:1.5;
  resize:none;padding:1.5rem;
  transition:all .3s ease;
}
.json-input:focus{
  outline:none;
  box-shadow:inset 0 0 0 2px var(--primary);
}
.json-output{
  overflow:auto;white-space:pre-wrap;word-break:break-all;
}

/* Enhanced Buttons */
.btn{
  padding:1rem 2rem;border:none;border-radius:var(--radius);
  cursor:pointer;font-weight:600;font-size:.95rem;
  transition:all .3s ease;
  display:flex;align-items:center;gap:.75rem;
  justify-content:center;text-decoration:none;
  position:relative;overflow:hidden;
}
.btn::before{
  content:'';position:absolute;top:0;left:-100%;
  width:100%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);
  transition:left .5s;
}
.btn:hover::before{left:100%}
.btn-primary{
  background:var(--gradient-primary);color:white;
  box-shadow:0 4px 15px rgba(37,99,235,.3);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 25px rgba(37,99,235,.4);
}
.btn-secondary{
  background:var(--bg-card);color:var(--text);
  border:2px solid var(--border);
}
.btn-secondary:hover{
  border-color:var(--primary);
  color:var(--primary);
  transform:translateY(-1px);
}
.btn-accent{
  background:linear-gradient(135deg,var(--accent),var(--accent-hover));
  color:white;
}

/* Controls Grid */
.controls{
  display:flex;flex-direction:column;gap:1rem;
  padding:1.5rem 0;
}

/* Enhanced Stats */
.input-stats,.output-stats{
  display:flex;gap:1.5rem;padding:1rem 1.5rem;
  font-size:.875rem;color:var(--text-muted);
  border-top:1px solid var(--border);
  background:var(--bg-alt);
}

/* Enhanced Messages */
.error-message{
  background:linear-gradient(135deg,#fef2f2,#fee2e2);
  border:1px solid #fecaca;color:#dc2626;
  padding:1rem 1.5rem;margin:1rem;
  border-radius:var(--radius);
  font-weight:500;
}
[data-theme="dark"] .error-message{
  background:linear-gradient(135deg,#450a0a,#7f1d1d);
  border-color:#7f1d1d;color:#f87171;
}
.success-message{
  position:fixed;top:90px;right:2rem;
  background:var(--success);color:white;
  padding:1rem 1.5rem;border-radius:var(--radius);
  z-index:1000;transform:translateX(100%);
  transition:transform .3s ease;
  box-shadow:var(--shadow-lg);
  font-weight:500;
}
.success-message.show{transform:translateX(0)}

/* Enhanced Features Grid */
.features{margin:5rem 0;padding:4rem 0;background:var(--bg-alt)}
.features-title{
  text-align:center;margin-bottom:3rem;
  font-size:2.5rem;font-weight:700;color:var(--text);
}
.features-grid{
  display:grid;grid-template-columns:repeat(4, 1fr);
  gap:2rem;
}
.feature-card{
  background:var(--bg-card);
  padding:2.5rem 2rem;
  border-radius:var(--radius-lg);
  border:1px solid var(--border);
  text-align:center;
  transition:all .3s ease;
  position:relative;
  overflow:hidden;
}
.feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;
  height:4px;background:var(--gradient-primary);
}
.feature-card:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-xl);
}
.feature-icon{
  font-size:3rem;margin-bottom:1.5rem;
  background:var(--gradient-primary);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
}
.feature-card h3{
  margin-bottom:1rem;color:var(--text);
  font-size:1.25rem;font-weight:600;
}
.feature-card p{color:var(--text-muted);line-height:1.6}

/* Enhanced Steps */
.usage-guide{margin:4rem 0}
.usage-title{
  font-size:2.5rem;font-weight:700;text-align:center;
  margin-bottom:3rem;color:var(--text);
}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}
.step{
  background:var(--bg-card);
  padding:2rem;border-radius:var(--radius-lg);
  border:1px solid var(--border);
  transition:all .3s ease;
}
.step:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-lg);
}
.step-number{
  width:50px;height:50px;
  background:var(--gradient-primary);
  color:white;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:1.25rem;
  margin-bottom:1.5rem;
}
.step-content h3{
  margin-bottom:1rem;color:var(--text);
  font-weight:600;
}
.step-content p{color:var(--text-muted);line-height:1.6}

/* Related Tools */
.related-tools{margin:4rem 0}
.related-title{
  font-size:2rem;font-weight:700;margin-bottom:2rem;
  color:var(--text);text-align:center;
}
.tools-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:1.5rem;
}
.tool-link{text-decoration:none}
.tool-card{
  background:var(--bg-card);
  padding:2rem;border-radius:var(--radius-lg);
  border:1px solid var(--border);
  text-align:center;
  transition:all .3s ease;
}
.tool-card:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-lg);
  border-color:var(--primary);
}
.tool-icon{font-size:2.5rem;margin-bottom:1rem}
.tool-card h3{
  margin-bottom:.75rem;color:var(--text);
  font-weight:600;
}
.tool-card p{color:var(--text-muted);font-size:.9rem}

/* Tutorial Section */
.tutorial-section{margin:4rem 0}
.tutorial-card{
  background:var(--gradient-primary);
  padding:3rem 2rem;border-radius:var(--radius-lg);
  text-align:center;color:white;
  position:relative;overflow:hidden;
}
.tutorial-card::before{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3e%3cpath d='M0,0 Q50,20 100,0 L100,100 L0,100 Z' fill='%23ffffff' fill-opacity='0.1'/%3e%3c/svg%3e");
}
.tutorial-card *{position:relative;z-index:1}
.tutorial-card h2{margin-bottom:1rem;font-size:2rem}
.tutorial-card .btn{
  margin-top:1.5rem;background:white;
  color:var(--primary);font-weight:600;
}

/* Enhanced Footer */
.footer{
  background:var(--bg-alt);
  border-top:1px solid var(--border);
  margin-top:5rem;padding:3rem 0 2rem 0;
}
.footer-content{
  max-width:1200px;margin:0 auto;padding:0 1rem;
}
.footer-text{
  color:var(--text-muted);line-height:1.6;
}
.footer-text > p:first-child{
  text-align:center;font-weight:600;
  margin-bottom:2rem;padding-bottom:1rem;
  border-bottom:1px solid var(--border);
}
.footer-section{
  margin-bottom:3rem;
}
.footer-section h3{
  color:var(--text);font-weight:700;
  font-size:1.25rem;margin-bottom:1.5rem;
  padding-bottom:.5rem;
  border-bottom:2px solid var(--primary);
  display:inline-block;
}
.footer-section h4{
  color:var(--text);font-weight:600;
  margin:1.5rem 0 .75rem 0;
  font-size:1rem;
}
.footer-section p{
  margin-bottom:1rem;
  text-align:justify;
}
.footer-section a{
  color:var(--primary);text-decoration:none;
  font-weight:500;transition:color .3s ease;
}
.footer-section a:hover{
  color:var(--primary-hover);
  text-decoration:underline;
}

/* Loading */
.loading{
  position:fixed;top:0;left:0;right:0;bottom:0;
  background:rgba(0,0,0,.7);
  display:none;flex-direction:column;
  align-items:center;justify-content:center;
  z-index:2000;
}
.loading-spinner{
  width:50px;height:50px;
  border:4px solid var(--border);
  border-top:4px solid var(--primary);
  border-radius:50%;
  animation:spin 1s linear infinite;
  margin-bottom:1rem;
}

/* External Links */
.external-links{margin:3rem 0}
.external-title{
  font-size:1.5rem;font-weight:600;
  margin-bottom:1rem;color:var(--text);
}
.link-list{list-style:none}
.link-list li{margin-bottom:.75rem}
.link-list a{
  color:var(--primary);text-decoration:none;
  font-weight:500;transition:all .3s ease;
}
.link-list a:hover{
  text-decoration:underline;
  color:var(--primary-hover);
}

/* Related Sites Section */
.related-sites-section {
  margin-bottom: 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.related-sites-section h3 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.related-sites-description {
  color: var(--secondary);
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
}

.sites-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.category {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.category h4 {
  color: var(--primary);
  margin-bottom: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.sites-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sites-list li {
  margin-bottom: 0.5rem;
}

.sites-list a {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.sites-list a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.current-site {
  color: var(--success);
  font-weight: 500;
  font-size: 0.9rem;
}

/* Animations */
@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.7}}
@keyframes slideInUp{
  0%{opacity:0;transform:translateY(30px)}
  100%{opacity:1;transform:translateY(0)}
}

/* Responsive Design */
@media (max-width:768px){
  .hero-title{font-size:2.25rem}
  .hero-description{font-size:1.1rem}
  .tool-interface{grid-template-columns:1fr;gap:1.5rem}
  .controls{flex-direction:row;flex-wrap:wrap}
  .features-grid{grid-template-columns:repeat(2, 1fr)}
  .json-input,.json-output{height:300px;font-size:13px}
  .features-title{font-size:2rem}
  .usage-title{font-size:2rem}
  .steps{grid-template-columns:1fr}
  .sites-categories{grid-template-columns:1fr;gap:1rem}
  .category{padding:0.75rem}
}

@media (max-width:480px){
  .container{padding:0 1rem}
  .hero{padding:3rem 0}
  .hero-title{font-size:2rem}
  .btn{padding:.75rem 1.5rem;font-size:.9rem}
  .feature-card{padding:2rem 1.5rem}
  .step{padding:1.5rem}
  .tutorial-card{padding:2rem 1.5rem}
  .features-grid{grid-template-columns:1fr}
}