/* =========================
   Atlas4D Landing — Light Theme
   ========================= */

/* Theme (Light / Luxury) */
:root{
  --bg:#f7faff;              /* светъл синкаво-бял фон */
  --panel:#ffffff;           /* карти / панели */
  --panel-2:#f3f6ff;         /* леко тониран вторичен фон */
  --line:rgba(2,8,23,.10);   /* деликатни граници */
  --ink:#0b1220;             /* основен текст (много тъмно синьо) */
  --ink-dim:#475569;         /* вторичен текст */
  --heading:#0b1220;         /* заглавия */
  --brand:#2563eb;           /* royal blue */
  --brand-2:#60a5fa;         /* светъл акцент */
  --ok:#10b981;              /* зелено */
  --warn:#eab308;            /* златисто */
  --down:#ef4444;            /* червено */
  --shadow:0 10px 28px rgba(15,23,42,.08);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;line-height:1.6}
img{display:block;max-width:100%;height:auto}
a{color:var(--brand);text-decoration:none}
a:hover{filter:brightness(1.05)}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Navbar */
.navbar{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid var(--line)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-brand h1{margin:0;font-weight:800;letter-spacing:.3px;color:var(--heading)}
.brand-accent{color:var(--brand)}
.nav-links{display:flex;gap:1.1rem;align-items:center}
.nav-links a{padding:.45rem .7rem;border-radius:.6rem;color:var(--ink)}
.nav-links a:hover{background:#eef2ff}
.btn-primary{background:linear-gradient(180deg,var(--brand-2),var(--brand));padding:.55rem .9rem;border-radius:.7rem;color:#fff;border:1px solid rgba(0,0,0,.04);box-shadow:0 8px 20px rgba(37,99,235,.25)}
.btn-primary:hover{filter:brightness(1.03)}
@media (max-width:980px){ .nav-links{display:none} }

/* Hero */
.hero{position:relative;overflow:hidden;padding:80px 0 40px}
.hero-background{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(1200px 600px at 10% 10%, rgba(96,165,250,.20), transparent 60%),
    radial-gradient(900px 500px at 90% 20%, rgba(37,99,235,.18), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.6), rgba(255,255,255,.4));
  animation:glowShift 14s ease-in-out infinite alternate;
}
@keyframes glowShift{0%{filter:hue-rotate(0)}100%{filter:hue-rotate(8deg)}}
.hero-content{max-width:880px;margin:0 auto;text-align:center}
.hero-title{font-size:clamp(36px,5.2vw,64px);line-height:1.05;margin:0 0 10px;color:var(--heading);opacity:0;transform:translateY(8px);animation:heroDrop .7s ease-out .1s forwards}
.gradient-text{background:linear-gradient(90deg,#1d4ed8,#06b6d4);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-subtitle{max-width:880px;margin:0 auto 18px;color:#334155;opacity:0;transform:translateY(10px);animation:heroDrop .7s ease-out .22s forwards}
.hero-cta{display:flex;gap:.7rem;flex-wrap:wrap;justify-content:center;margin-top:12px;opacity:0;transform:translateY(12px);animation:heroDrop .7s ease-out .34s forwards}
.btn{display:inline-flex;gap:.5rem;align-items:center;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:.7rem;padding:.6rem .9rem;transition:transform .15s ease, box-shadow .15s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(15,23,42,.1)}
.btn-outline{background:#fff}
.btn-large{padding:.75rem 1rem}
.btn-white{background:#fff;color:#0b1220;border-color:rgba(0,0,0,.08)}
.btn-outline-white{color:#0b1220;border-color:rgba(0,0,0,.12);background:#ffffffb8}
.btn-outline-white:hover{background:#fff}
@keyframes heroDrop{to{opacity:1;transform:translateY(0)}}

/* Hero stats */
.hero-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:20px}
.stat{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:14px;padding:14px 16px;box-shadow:var(--shadow);min-width:0}
.stat-value{font-size:clamp(22px,3.3vw,36px);font-weight:800;color:#0b1220}
.stat-label{color:#3f4b5d;font-size:13px}
@media (max-width:640px){ .hero-stats{grid-template-columns:1fr} }

/* Section headers */
.section-header{text-align:center;margin:64px 0 24px}
.section-header h2{margin:0 0 8px;font-size:clamp(24px,3vw,32px);color:var(--heading)}
.section-header p{color:#3f4b5d}

/* Evolution timeline */
.evolution-timeline{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;margin:12px auto 0}
.evolution-step{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;min-width:220px;text-align:center;box-shadow:var(--shadow);color:var(--ink)}
.evolution-icon{font-size:22px;margin-bottom:6px}
.evolution-arrow{opacity:.6;color:#64748b}

/* Generic cards/grids */
.philosophy-card,.feature-card,.use-case-card,.screenshot-card,.service-category,.tech-category{
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1px solid var(--line);border-radius:14px;padding:16px;box-shadow:var(--shadow);min-width:0;color:var(--ink)
}
.philosophy-card h3,.feature-card h3,.use-case-card h3,.service-category h3,.tech-category h3{color:#0b1220;margin-top:0}
.philosophy-card p,.feature-card p,.use-case-card p,.service-item p,.tech-item{color:#334155}
.philosophy-card:hover,.feature-card:hover,.use-case-card:hover,.screenshot-card:hover,.service-category:hover,.tech-category:hover{
  transform:translateY(-2px);transition:transform .18s ease;box-shadow:0 16px 36px rgba(15,23,42,.12)
}
.philosophy-grid,.features-grid,.screenshot-grid,.use-cases-grid,.services-grid,.tech-grid{display:grid;gap:16px}
.philosophy-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.features-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.screenshot-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.use-cases-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.services-grid{grid-template-columns:repeat(auto-fit,minmax(420px,1fr))}
.tech-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* Service lists – prevent overflow of small panels */
.service-category h3{margin:0 0 10px;border-bottom:1px dashed var(--line);padding-bottom:8px}
.service-items{display:grid;grid-template-columns:1fr;gap:10px}
.service-item{display:flex;gap:10px;align-items:flex-start;padding:10px;border:1px dashed var(--line);border-radius:10px;background:#fcfdff;min-width:0}
.service-icon{width:26px;display:inline-flex;justify-content:center}

/* Code examples (тъмен блок за контраст) */
.code-examples{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.code-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.code-title{font-weight:600;color:var(--heading)}
.code-link{font-size:14px;color:var(--brand)}
.code-block{background:#0f172a;border:1px solid #0b1220; border-color:rgba(255,255,255,.08);border-radius:12px;padding:14px;overflow:auto;color:#eaf2ff}
.code-block code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre}
.comment{color:#93c5fd;opacity:.95}
.btn-copy{font-size:12px;border:1px solid var(--line);padding:.25rem .5rem;border-radius:.5rem;background:var(--panel);color:#334155;cursor:pointer}
.btn-copy:hover{color:#0b1220}
.btn-copy.copied{border-color:var(--ok);color:#047857}

/* Screenshots */
.screenshot-card img{border-radius:10px;border:1px solid var(--line);margin-bottom:10px;transition:transform .2s ease}
.screenshot-card:hover img{transform:scale(1.015)}

/* Technology items */
.tech-items{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:10px}
.tech-item{display:flex;gap:8px;align-items:center;padding:10px;border:1px dashed var(--line);border-radius:10px;background:#fcfdff;min-width:0}
.tech-icon{width:18px}

/* Performance comparison — stacked (vertical) */
.performance-comparison{margin-top:26px}
.performance-comparison h3{color:var(--heading)}
.comparison-grid{display:grid;grid-template-columns:1fr;gap:14px}
.comparison-item{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px}
.comparison-label{font-size:14px;color:#334155;margin-bottom:8px}
.comparison-bar{height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.comparison-item.old .comparison-bar{background:var(--down)}
.comparison-item.new .comparison-bar{background:var(--ok)}
.comparison-details{display:flex;gap:8px;margin-top:8px;color:#475569;font-size:13px}
.result-badge{display:inline-block;background:#065f46;color:#e6fffb;border:1px solid #0d9488;padding:.25rem .5rem;border-radius:999px;margin-right:.5rem}

/* CTA & Footer */
.cta{padding:56px 0;background:
  radial-gradient(800px 400px at 10% 0%, rgba(96,165,250,.22), transparent 58%),
  radial-gradient(700px 380px at 90% 10%, rgba(37,99,235,.18), transparent 58%),
  linear-gradient(180deg, rgba(255,255,255,.65), rgba(255,255,255,.35));
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center}
.cta .btn{box-shadow:0 10px 24px rgba(37,99,235,.14)}
.footer{border-top:1px solid var(--line);background:#fff;color:#475569}
.footer-content{display:flex;gap:24px;justify-content:space-between;flex-wrap:wrap;padding-top:26px}
.footer-brand h3{color:#0b1220;margin:0 0 8px}
.footer-bottom{text-align:center;color:#64748b;padding:16px 0;border-top:1px solid var(--line)}

/* Utilities */
section{padding:32px 0}
.min-w-0{min-width:0}
.hidden{display:none}

/* Responsive tweaks */
@media (max-width:900px){
  .services-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .hero{padding:70px 0 20px}
  .hero-cta{flex-direction:column}
}

/* ===== MODERN ENHANCEMENTS ===== */

/* Enhanced Gradients */
.hero-background {
  background:
    radial-gradient(1400px 700px at 15% 15%, rgba(96,165,250,.28), transparent 65%),
    radial-gradient(1000px 600px at 85% 25%, rgba(37,99,235,.22), transparent 65%),
    linear-gradient(180deg, rgba(255,255,255,.7), rgba(247,250,255,.5));
}

/* Improved Cards with Depth */
.philosophy-card, .feature-card, .use-case-card, .service-category, .tech-category {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid rgba(37,99,235,0.08);
  box-shadow: 0 4px 16px rgba(15,23,42,.04), 0 1px 3px rgba(15,23,42,.08);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.philosophy-card:hover, .feature-card:hover, .use-case-card:hover,
.service-category:hover, .tech-category:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(37,99,235,.12), 0 4px 8px rgba(37,99,235,.08);
  border-color: rgba(37,99,235,0.15);
}

/* Enhanced Buttons */
.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  box-shadow: 0 4px 16px rgba(37,99,235,.3), 0 2px 4px rgba(37,99,235,.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37,99,235,.4), 0 4px 8px rgba(37,99,235,.25);
  filter: brightness(1.05);
}

.btn {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15,23,42,.12);
}

/* Enhanced Stats */
.stat {
  background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
  border: 1px solid rgba(37,99,235,0.1);
  box-shadow: 0 4px 20px rgba(37,99,235,.08);
  transition: all 0.3s ease;
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37,99,235,.14);
}

/* Improved Typography */
.hero-title {
  letter-spacing: -0.02em;
  text-shadow: 0 2px 12px rgba(37,99,235,.08);
}

.section-header h2 {
  letter-spacing: -0.01em;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Better Focus States */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Responsive Improvements */
@media (max-width: 768px) {
  .hero-stats {
    gap: 12px;
  }
  
  .stat {
    padding: 12px 14px;
  }
  
  .features-grid, .philosophy-grid, .services-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .hero-title {
    font-size: 32px;
    line-height: 1.1;
  }
}

/* Loading Animation for Images */
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* Smooth Transitions */
* {
  transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}


/* Footer Improvements */
.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin: 2rem 0;
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-column h4 {
  color: var(--heading);
  font-weight: 600;
  font-size: 0.95rem;
  margin: 0 0 0.5rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--brand);
  display: inline-block;
}

.footer-column a {
  color: var(--ink-dim);
  font-size: 0.9rem;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.footer-column a:hover {
  color: var(--brand);
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .footer-links {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Footer Layout Fix */
.footer {
  background: var(--bg);
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--line);
}

.footer-content {
  display: block !important;
  width: 100%;
}

.footer-brand {
  margin-bottom: 2.5rem;
  text-align: center;
}

.footer-links {
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: 3rem !important;
  margin: 2rem 0 !important;
}

@media (max-width: 900px) {
  .footer-links {
    grid-template-columns: 1fr !important;
  }
}