/* CSS Reset & Base Styles */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;-moz-tab-size:4;tab-size:4;line-height:1.5}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:var(--text-primary);background:var(--bg-primary);transition:background .3s,color .3s}img,svg{display:block;max-width:100%}button,input,select{font:inherit;-webkit-appearance:none;-moz-appearance:none;appearance:none}button{cursor:pointer}a{color:inherit;text-decoration:none}select{background-image:url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%236b7280' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center;padding-right:3rem}

/* CSS Variables - Light Mode */
:root{
--primary:#6366f1;
--primary-dark:#4f46e5;
--primary-light:#818cf8;
--secondary:#8b5cf6;
--accent:#ec4899;
--success:#10b981;
--warning:#f59e0b;
--error:#ef4444;
--bg-primary:#ffffff;
--bg-secondary:#f9fafb;
--bg-tertiary:#f3f4f6;
--text-primary:#111827;
--text-secondary:#6b7280;
--text-tertiary:#9ca3af;
--border:#e5e7eb;
--shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);
--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);
--shadow-xl:0 20px 25px -5px rgba(0,0,0,.1),0 10px 10px -5px rgba(0,0,0,.04);
}

/* Dark Mode */
[data-theme="dark"]{
--bg-primary:#0f172a;
--bg-secondary:#1e293b;
--bg-tertiary:#334155;
--text-primary:#f1f5f9;
--text-secondary:#cbd5e1;
--text-tertiary:#94a3b8;
--border:#334155;
--shadow:0 1px 3px rgba(0,0,0,.3),0 1px 2px rgba(0,0,0,.2);
--shadow-lg:0 10px 15px -3px rgba(0,0,0,.3),0 4px 6px -2px rgba(0,0,0,.2);
--shadow-xl:0 20px 25px -5px rgba(0,0,0,.3),0 10px 10px -5px rgba(0,0,0,.2);
}

/* Container */
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}

/* Navigation */
.nav{background:var(--bg-primary);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;backdrop-filter:blur(10px);background:rgba(255,255,255,.9)}
[data-theme="dark"] .nav{background:rgba(15,23,42,.9)}
.nav-content{display:flex;align-items:center;justify-content:space-between;height:64px;gap:2rem}
.logo{display:flex;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700;color:var(--primary);transition:opacity .2s}
.logo:hover{opacity:.8}
.logo-icon{color:var(--primary)}
.nav-links{display:none;gap:2rem}
.nav-links a{font-weight:500;color:var(--text-secondary);transition:color .2s;white-space:nowrap}
.nav-links a:hover{color:var(--primary)}
.theme-toggle{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:8px;padding:.5rem;display:flex;align-items:center;justify-content:center;width:40px;height:40px;transition:all .2s}
.theme-toggle:hover{background:var(--primary);border-color:var(--primary);color:#fff}
.sun-icon{display:block}
.moon-icon{display:none}
[data-theme="dark"] .sun-icon{display:none}
[data-theme="dark"] .moon-icon{display:block}

@media(min-width:768px){
.nav-links{display:flex}
}

/* Hero Section */
.hero{padding:4rem 0;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-primary) 100%)}
.hero-content{max-width:900px;margin:0 auto;text-align:center}
.hero h1{font-size:2.5rem;font-weight:800;margin-bottom:1rem;line-height:1.2;color:var(--primary);background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);-webkit-background-clip:text;-moz-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}@supports not (-webkit-background-clip:text){.hero h1{color:var(--primary);background:none}}
.hero-subtitle{font-size:1.125rem;color:var(--text-secondary);margin-bottom:3rem;line-height:1.7}

/* Generator Card */
.generator-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:16px;padding:2rem;box-shadow:var(--shadow-xl);margin-bottom:2rem}
.generator-options{display:grid;gap:1.5rem;margin-bottom:1.5rem}
.form-group label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--text-primary);font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}
.form-control{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:8px;background:var(--bg-secondary);color:var(--text-primary);transition:all .2s;font-size:1rem}
.form-control:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.1)}
.form-control::placeholder{color:var(--text-tertiary)}

.btn-primary{width:100%;padding:1rem 2rem;background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;border:0;border-radius:8px;font-weight:600;font-size:1rem;display:flex;align-items:center;justify-content:center;gap:.5rem;transition:all .2s;box-shadow:var(--shadow-lg)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-xl)}
.btn-primary:active{transform:translateY(0)}

.btn-secondary{display:inline-flex;align-items:center;gap:.5rem;padding:.875rem 1.75rem;background:var(--bg-tertiary);color:var(--text-primary);border:2px solid var(--border);border-radius:8px;font-weight:600;transition:all .2s}
.btn-secondary:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Results */
.results{display:grid;gap:.75rem;margin-top:1.5rem}
.result-item{display:flex;align-items:center;justify-content:space-between;padding:1rem;background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;transition:all .2s}
.result-item:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.result-username{font-weight:600;font-size:1.125rem;color:var(--text-primary)}
.result-actions{display:flex;gap:.5rem}
.btn-copy,.btn-check{padding:.5rem 1rem;border-radius:6px;font-size:.875rem;font-weight:600;border:1px solid var(--border);background:var(--bg-primary);color:var(--text-primary);transition:all .2s}
.btn-copy:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-check{background:var(--success);color:#fff;border-color:var(--success)}
.btn-check:hover{opacity:.9}
.availability{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.5rem}
.availability-badge{padding:.25rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600;text-transform:uppercase}
.available{background:#d1fae5;color:#065f46}
.taken{background:#fee2e2;color:#991b1b}
[data-theme="dark"] .available{background:#064e3b;color:#6ee7b7}
[data-theme="dark"] .taken{background:#7f1d1d;color:#fca5a5}

/* Privacy Note */
.privacy-note{display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem;background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;font-size:.875rem;color:var(--text-secondary)}
.privacy-note svg{width:16px;height:16px;color:var(--success)}

/* Categories Section */
.categories{padding:4rem 0;background:var(--bg-primary)}
.categories h2{font-size:2rem;font-weight:700;text-align:center;margin-bottom:3rem}
.category-grid{display:grid;gap:1.5rem}
.category-card{background:var(--bg-secondary);border:2px solid var(--border);border-radius:12px;padding:2rem;transition:all .3s;position:relative;overflow:hidden}
.category-card:hover{border-color:var(--primary);box-shadow:var(--shadow-xl);transform:translateY(-4px)}
.category-card:hover .category-arrow{transform:translateX(4px)}
.category-icon{width:48px;height:48px;margin-bottom:1rem;color:var(--primary)}
.category-card h3{font-size:1.25rem;font-weight:700;margin-bottom:.75rem}
.category-card p{color:var(--text-secondary);line-height:1.6;margin-bottom:1rem}
.category-arrow{font-size:1.5rem;color:var(--primary);font-weight:700;transition:transform .2s}

@media(min-width:640px){
.generator-options{grid-template-columns:repeat(2,1fr)}
.category-grid{grid-template-columns:repeat(2,1fr)}
}

@media(min-width:1024px){
.generator-options{grid-template-columns:repeat(3,1fr)}
.category-grid{grid-template-columns:repeat(2,1fr)}
.hero h1{font-size:3.5rem}
}

/* Platforms Section */
.platforms{padding:4rem 0;background:var(--bg-secondary)}
.platforms h2{font-size:2rem;font-weight:700;text-align:center;margin-bottom:3rem}
.platform-list{display:grid;gap:1rem;max-width:800px;margin:0 auto}
.platform-link{display:flex;align-items:center;gap:1rem;padding:1.25rem 1.5rem;background:var(--bg-primary);border:2px solid var(--border);border-radius:12px;font-weight:600;transition:all .2s}
.platform-link:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateX(4px)}
.platform-link svg{width:24px;height:24px;color:var(--primary);flex-shrink:0}

@media(min-width:640px){
.platform-list{grid-template-columns:repeat(2,1fr)}
}

/* Features Section */
.features{padding:4rem 0;background:var(--bg-primary)}
.features h2{font-size:2rem;font-weight:700;text-align:center;margin-bottom:3rem}
.feature-grid{display:grid;gap:2rem}
.feature-item{text-align:center}
.feature-icon{width:64px;height:64px;margin:0 auto 1rem;color:var(--primary);background:var(--bg-secondary);border-radius:12px;display:flex;align-items:center;justify-content:center}
.feature-item h3{font-size:1.25rem;font-weight:700;margin-bottom:.75rem}
.feature-item p{color:var(--text-secondary);line-height:1.6}

@media(min-width:640px){
.feature-grid{grid-template-columns:repeat(2,1fr)}
}

@media(min-width:1024px){
.feature-grid{grid-template-columns:repeat(3,1fr)}
}

/* Guide Preview */
.guide-preview{padding:4rem 0;background:var(--bg-secondary)}
.guide-content{max-width:800px;margin:0 auto}
.guide-content h2{font-size:2rem;font-weight:700;margin-bottom:1rem}
.guide-content>p{color:var(--text-secondary);line-height:1.7;margin-bottom:2rem;font-size:1.125rem}
.guide-list{display:grid;gap:1.5rem;margin-bottom:2rem}
.guide-item{display:flex;gap:1.5rem;padding:1.5rem;background:var(--bg-primary);border:1px solid var(--border);border-radius:12px}
.guide-number{width:40px;height:40px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.125rem;flex-shrink:0}
.guide-item h3{font-size:1.125rem;font-weight:700;margin-bottom:.5rem}
.guide-item p{color:var(--text-secondary);line-height:1.6}

/* FAQ Section */
.faq{padding:4rem 0;background:var(--bg-primary)}
.faq h2{font-size:2rem;font-weight:700;text-align:center;margin-bottom:3rem}
.faq-grid{display:grid;gap:2rem;max-width:900px;margin:0 auto}
.faq-item{padding:2rem;background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px}
.faq-item h3{font-size:1.125rem;font-weight:700;margin-bottom:1rem;color:var(--primary)}
.faq-item p{color:var(--text-secondary);line-height:1.7}

@media(min-width:768px){
.faq-grid{grid-template-columns:repeat(2,1fr)}
}

/* Footer */
.footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:3rem 0 1.5rem}
.footer-content{display:grid;gap:2rem;margin-bottom:2rem}
.footer-section h4{font-weight:700;margin-bottom:1rem;font-size:1rem}
.footer-section p{color:var(--text-secondary);line-height:1.6;font-size:.875rem}
.footer-section ul{list-style:none}
.footer-section ul li{margin-bottom:.5rem}
.footer-section ul a{color:var(--text-secondary);font-size:.875rem;transition:color .2s}
.footer-section ul a:hover{color:var(--primary)}
.footer-bottom{text-align:center;padding-top:2rem;border-top:1px solid var(--border);color:var(--text-tertiary);font-size:.875rem}

@media(min-width:640px){
.footer-content{grid-template-columns:repeat(2,1fr)}
}

@media(min-width:1024px){
.footer-content{grid-template-columns:2fr 1fr 1fr 1fr}
}

/* Page Content Styles */
.page-header{padding:3rem 0;background:var(--bg-secondary);text-align:center;border-bottom:1px solid var(--border)}
.page-header h1{font-size:2.5rem;font-weight:800;margin-bottom:1rem;color:var(--primary);background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);-webkit-background-clip:text;-moz-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}@supports not (-webkit-background-clip:text){.page-header h1{color:var(--primary);background:none}}
.page-header p{font-size:1.125rem;color:var(--text-secondary);max-width:700px;margin:0 auto;line-height:1.7}

.page-content{padding:4rem 0}
.content-section{margin-bottom:3rem}
.content-section h2{font-size:1.75rem;font-weight:700;margin-bottom:1.5rem;color:var(--text-primary)}
.content-section h3{font-size:1.25rem;font-weight:700;margin:2rem 0 1rem;color:var(--text-primary)}
.content-section p{color:var(--text-secondary);line-height:1.7;margin-bottom:1rem;font-size:1.0625rem}
.content-section ul,.content-section ol{margin:1rem 0 1rem 1.5rem;color:var(--text-secondary);line-height:1.7}
.content-section li{margin-bottom:.5rem}
.content-section strong{color:var(--text-primary);font-weight:600}

.examples-grid{display:grid;gap:1rem;margin:2rem 0}
.example-item{padding:1rem;background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;font-family:monospace;font-size:.9375rem;color:var(--primary)}

@media(min-width:640px){
.examples-grid{grid-template-columns:repeat(2,1fr)}
}

@media(min-width:1024px){
.examples-grid{grid-template-columns:repeat(3,1fr)}
}

/* Utility Classes */
.text-center{text-align:center}
.mb-1{margin-bottom:.5rem}
.mb-2{margin-bottom:1rem}
.mb-3{margin-bottom:1.5rem}
.mb-4{margin-bottom:2rem}
.mt-1{margin-top:.5rem}
.mt-2{margin-top:1rem}
.mt-3{margin-top:1.5rem}
.mt-4{margin-top:2rem}

/* Loading State */
.loading{opacity:.6;pointer-events:none}

/* Animations */
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeIn .3s ease-out}

/* Safari-specific fixes */
@supports (-webkit-backdrop-filter:blur(10px)){
.nav{-webkit-backdrop-filter:blur(10px)}
}

/* Print Styles */
@media print{
.nav,.footer,.generator-card,.theme-toggle{display:none}
}