/* === Базовые стили === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
html,body{width:100%;max-width:100%;overflow-x:hidden;font-family:'Inter',sans-serif;line-height:1.6;transition:background .3s,color .3s;scroll-behavior:smooth;}
a{text-decoration:none;color:inherit;transition:color .3s ease;}

/* === Светлая тема === */
:root {
  --bg-color:#ffffff;
  --text-color:#111;
  --secondary-text:#444;
  --hero-bg:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  --nav-bg:rgba(255,255,255,0.9);
  --cta-bg:#111;
  --cta-text:#fff;
  --section-bg:#f8f9fa;
  --feature-bg:#fff;
  --footer-bg:#111;
  --footer-text:#ccc;
  --hero-text:#fff;
}

/* === Тёмная тема === */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color:#0b0b0b;
    --text-color:#f5f5f5;
    --secondary-text:#aaa;
    --hero-bg:linear-gradient(135deg,#111 0%,#333 100%);
    --nav-bg:rgba(15,15,15,0.85);
    --cta-bg:#f5f5f5;
    --cta-text:#111;
    --section-bg:#111;
    --feature-bg:#1c1c1c;
    --footer-bg:#0b0b0b;
    --footer-text:#888;
    --hero-text:#fff;
  }
}

/* === Общие цвета === */
body{background:var(--bg-color);color:var(--text-color);}
nav{position:fixed;top:0;left:0;right:0;width:100%;background:var(--nav-bg);backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,0.1);z-index:1000;padding:1rem 0;overflow-x:clip;}
.nav-container{max-width:1200px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center;}
.logo{font-size:1.5rem;font-weight:700;}
.nav-links{display:flex;list-style:none;gap:2rem;}
.nav-links a:hover{color:var(--cta-bg);}
.cta-button{background:var(--cta-bg);color:var(--cta-text);padding:.75rem 1.5rem;border-radius:8px;font-weight:500;transition:all .3s;}
.cta-button:hover{opacity:.85;transform:translateY(-1px);}

/* === Hero === */
.hero{
  min-height:calc(100vh - 80px);
  display:flex;
  align-items:center;
  justify-content:center;
  position:relative;
  overflow:hidden;
  padding-top:80px;
  width:100%;
  background:var(--hero-bg);
}
.hero-canvas{position:absolute;inset:0;z-index:1;}
.hero-content{max-width:1200px;margin:0 auto;padding:0 2rem;text-align:center;position:relative;z-index:2;}
.hero h1{font-size:clamp(2.5rem,5vw,4rem);font-weight:700;color:var(--hero-text);margin-bottom:1.5rem;line-height:1.2;}
.hero p{font-size:1.25rem;color:rgba(255,255,255,0.9);margin-bottom:2rem;max-width:600px;margin:auto;}
.hero-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;}
.btn-primary{background:#fff;color:#111;padding:1rem 2rem;border-radius:12px;font-weight:600;box-shadow:0 4px 20px rgba(0,0,0,0.1);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(0,0,0,0.15);}
.btn-secondary{background:transparent;color:#fff;padding:1rem 2rem;border:2px solid rgba(255,255,255,0.3);border-radius:12px;font-weight:600;}
.btn-secondary:hover{background:rgba(255,255,255,0.1);border-color:rgba(255,255,255,0.5);}

/* === Features === */
.features{padding:6rem 0;background:var(--section-bg);}
.container{max-width:1200px;margin:0 auto;padding:0 2rem;}
.section-header{text-align:center;margin-bottom:4rem;}
.section-header h2{font-size:2.5rem;font-weight:700;margin-bottom:1rem;}
.section-header p{font-size:1.125rem;color:var(--secondary-text);max-width:600px;margin:0 auto;}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;}
.feature-card{background:var(--feature-bg);padding:2rem;border-radius:16px;box-shadow:0 4px 20px rgba(0,0,0,0.05);transition:all .3s ease;}
.feature-card:hover{transform:translateY(-5px);box-shadow:0 8px 40px rgba(0,0,0,0.1);}
.feature-icon{width:60px;height:60px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:1.5rem;font-size:1.5rem;color:white;}
.feature-card h3{font-size:1.25rem;font-weight:600;margin-bottom:1rem;}
.feature-card p{color:var(--secondary-text);line-height:1.6;}

/* === CTA === */
.cta-section{padding:6rem 0;background:linear-gradient(135deg,#111 0%,#333 100%);color:#fff;text-align:center;}
.cta-section h2{font-size:2.5rem;font-weight:700;margin-bottom:1rem;}
.cta-section p{font-size:1.125rem;margin-bottom:2rem;opacity:.9;}

/* === Footer === */
footer{background:var(--footer-bg);color:var(--footer-text);padding:3rem 0;text-align:center;}
.footer-links{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap;margin-bottom:2rem;}
.footer-links a:hover{color:#fff;}
.footer-bottom{border-top:1px solid #333;padding-top:2rem;color:var(--footer-text);}

/* === Адаптивность === */
@media(max-width:768px){
  .nav-links{display:none;}
  .hero-buttons{flex-direction:column;align-items:center;}
  .btn-primary,.btn-secondary{width:100%;max-width:300px;}
  .features-grid{grid-template-columns:1fr;}
  .footer-links{flex-direction:column;gap:1rem;}
}