/* ============================ RESET & VARIABLES ============================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg-deep:#03051a;
  --glass-bg:rgba(255,255,255,0.045);
  --glass-border:rgba(255,255,255,0.12);
  --glass-hover:rgba(255,255,255,0.08);
  --neon-blue:#00d4ff;
  --neon-purple:#a855f7;
  --text-primary:#ffffff;
  --text-secondary:rgba(255,255,255,0.72);
  --text-muted:rgba(255,255,255,0.5);
  --radius-lg:28px;
  --radius-md:18px;
  --radius-sm:12px;
  --font-display:'Space Grotesk',sans-serif;
  --font-body:'Inter',sans-serif;
  --ease:cubic-bezier(0.22,1,0.36,1);
}
html{}
body{
  font-family:var(--font-body);
  background:var(--bg-deep);
  color:var(--text-primary);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
a{text-decoration:none;color:inherit}
button{font-family:inherit;cursor:pointer;border:none;outline:none}

/* ============================ BACKGROUND ============================ */
body::before{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:url('../img/ecosystem.webp') center/cover no-repeat;z-index:0}
body::after{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(3,5,26,0.20) 0%,rgba(3,5,26,0.40) 50%,rgba(3,5,26,0.90) 100%);pointer-events:none;z-index:0}

/* ============================ TOP BAR ============================ */
.back-bar{position:fixed;top:24px;right:max(28px,calc(50% - 800px + 28px));z-index:5;display:flex;gap:8px;align-items:center}
.back-home{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;color:var(--text-secondary);background:var(--glass-bg);border:1px solid var(--glass-border);transition:all 0.3s}
.back-home:hover{color:#fff;background:var(--glass-hover)}
.nav-lang{padding:10px 16px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;color:var(--neon-blue);background:var(--glass-bg);border:1px solid var(--glass-border);transition:all 0.3s}
.nav-lang:hover{background:var(--glass-hover)}

/* ============================ PAGE LAYOUT ============================ */
.page-wrap{position:relative;z-index:2;max-width:860px;margin:0 auto;padding:120px 40px 80px}
.page-logo{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:22px;letter-spacing:3px;color:#fff;margin-bottom:40px}
.page-logo .logo-dot{width:11px;height:11px;border-radius:50%;background:linear-gradient(135deg,var(--neon-blue),var(--neon-purple));box-shadow:0 0 14px rgba(0,212,255,0.7)}
.page-title{font-family:var(--font-display);font-size:clamp(32px,5vw,48px);font-weight:700;line-height:1.15;margin-bottom:16px;background:linear-gradient(135deg,#fff 0%,#e0e7ff 45%,var(--neon-blue) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.page-subtitle{font-size:18px;color:var(--text-secondary);margin-bottom:48px}

/* ============================ CONTENT CARDS ============================ */
.content-card{padding:36px 32px;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);margin-bottom:24px}
.content-card h2{font-family:var(--font-display);font-size:22px;font-weight:600;margin-bottom:14px;color:#fff}
.content-card h3{font-family:var(--font-display);font-size:17px;font-weight:600;margin-top:24px;margin-bottom:10px;color:var(--neon-blue)}
.content-card p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:12px}
.content-card ul{list-style:none;padding:0;margin:12px 0}
.content-card ul li{font-size:15px;color:var(--text-secondary);padding:6px 0;padding-left:24px;position:relative;line-height:1.7}
.content-card ul li::before{content:'';position:absolute;left:0;top:13px;width:6px;height:6px;border-radius:50%;background:var(--neon-blue)}
.content-card a{color:var(--neon-blue);text-decoration:underline}
.content-card strong{color:#fff;font-weight:600}

/* ============================ TOC SIDEBAR ============================ */
.page-layout{display:flex;gap:48px;max-width:1160px;margin:0 auto;padding:120px 40px 80px;position:relative;z-index:2;align-items:flex-start}
.page-layout .page-wrap{flex:1;min-width:0;max-width:none;margin:0;padding:0}
.page-toc{width:200px;flex-shrink:0;align-self:stretch}
.page-toc .toc-inner{position:sticky;top:100px}
.page-toc h3{font-family:var(--font-display);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:1.5px;color:var(--text-muted);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--glass-border)}
.page-toc ul{list-style:none;padding:0;margin:0}
.page-toc ul li{margin-bottom:1px}
.page-toc ul li a{display:block;padding:6px 10px;font-size:13px;color:var(--text-muted);border-radius:8px;transition:all 0.2s;line-height:1.4;border-left:2px solid transparent}
.page-toc ul li a:hover{color:#fff;background:var(--glass-bg)}
html{scroll-behavior:smooth}
.page-toc ul li a.active{color:var(--neon-blue);background:rgba(0,212,255,0.08);border-left-color:var(--neon-blue)}
.content-card h2{scroll-margin-top:100px}
@media(max-width:1024px){.page-toc{display:none}.page-layout{max-width:860px}}
@media(max-width:768px){.page-layout{padding:100px 24px 60px}}

/* ============================ FOOTER ============================ */
.page-footer{position:relative;z-index:2;text-align:center;padding:28px 32px;margin:0 40px 32px;font-size:14px;color:var(--text-muted);background:rgba(3,5,26,0.55);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border:1px solid var(--glass-border);border-radius:24px;box-shadow:0 8px 40px rgba(0,0,0,0.3)}

/* ============================ RESPONSIVE ============================ */
@media(max-width:768px){
  .page-wrap{padding:100px 24px 60px}
  .content-card{padding:28px 20px}
  .back-bar{right:24px}
  .page-footer{margin:0 16px 20px;padding:22px 20px;border-radius:18px}
}