:root {
  --bg: #0b0f19;
  --fg: #f8fafc;
  --muted: #94a3b8;
  --primary: #ff7a1a; /* ярко-оранжевый */
  --primary-600: #e06900;
  --accent: #0ea5e9;  /* голубой акцент */
  --danger: #ff3b57;
  --card: #0f172a;
  --border: #233143;
  --glow: 0 0 22px rgba(255,122,26,0.35), 0 0 44px rgba(14,165,233,0.18);
  --radius: 16px;
  --space: 8px;
  --maxw: 980px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 10% -10%, rgba(255,122,26,0.18), transparent 60%),
              radial-gradient(1200px 600px at 90% -10%, rgba(14,165,233,0.12), transparent 60%),
              linear-gradient(180deg, #0b0f19, #0b0f19 200px, #0b0f19);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 calc(var(--space) * 2); }

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  padding: 10px 16px;
  background: var(--primary);
  color: #020617;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
  z-index: 200;
}

.skip-link:focus { top: 16px; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6,8,22,0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: calc(var(--space) * 1.5); font-weight: 700; }
.brand .logo { font-size: 22px; filter: drop-shadow(0 0 12px rgba(124,58,237,0.5)); }
.brand .brand-name { color: var(--fg); text-decoration: none; }
.actions { display: flex; align-items: center; gap: calc(var(--space) * 2); }
.actions a { display:flex; align-items:center; gap:10px; color: var(--fg); text-decoration:none; padding:8px 12px; border-radius:12px; border:1px solid transparent; }
.actions a .icon { opacity:.9; font-size:16px; }
.actions a:hover { background: rgba(255,122,26,0.08); border-color: rgba(255,122,26,0.25); box-shadow: var(--glow); }
.actions a[aria-current="page"] { background: rgba(255,122,26,0.12); border-color: rgba(255,122,26,0.45); color: var(--primary); font-weight: 600; }
.user-status { color: var(--muted); font-size: 14px; }

.main { padding: calc(var(--space) * 4) 0; }

.hero {
  display: grid;
  gap: calc(var(--space) * 3);
  margin-bottom: calc(var(--space) * 5);
}

.hero-header {
  display: grid;
  gap: calc(var(--space) * 2);
}

.page-title { margin: 0; font-size: clamp(32px, 4vw, 48px); text-shadow: 0 2px 24px rgba(124,58,237,0.35); }
.page-subtitle { margin: 0; color: var(--muted); font-size: 18px; }

.cta-row { display: flex; flex-wrap: wrap; gap: calc(var(--space) * 2); margin-top: calc(var(--space) * 2); }
.hero-cta { min-width: 180px; text-align: center; }

.hero-benefits {
  display: grid;
  gap: calc(var(--space) * 1.5);
  margin: 0;
  padding: calc(var(--space) * 3);
  list-style: none;
  background: linear-gradient(180deg, rgba(12,18,48,0.9), rgba(10,15,40,0.9));
  border: 1px solid rgba(124,58,237,0.25);
  border-radius: var(--radius);
  box-shadow: var(--glow);
}

.hero-benefits li { display: flex; gap: calc(var(--space) * 1.5); align-items: flex-start; }
.hero-benefits span { font-size: 26px; line-height: 1; }
.hero-benefits strong { color: var(--primary); display: block; font-size: 16px; }
.hero-benefits p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }

.controls { display: grid; grid-template-columns: 1fr 1fr; gap: calc(var(--space) * 2); margin-bottom: calc(var(--space) * 2); }
.control-group { display: grid; gap: calc(var(--space) * 1); }
label { color: var(--muted); font-size: 14px; }
select, input[type="checkbox"] { accent-color: var(--primary); }
select { height: 40px; border-radius: 10px; background: var(--card); color: var(--fg); border: 1px solid var(--border); padding: 0 12px; }

.messages {
  display: grid; gap: calc(var(--space) * 2);
  background: linear-gradient(180deg, rgba(12,18,48,0.9), rgba(10,15,40,0.9));
  border: 1px solid rgba(124,58,237,0.25);
  border-radius: var(--radius);
  box-shadow: var(--glow);
  padding: calc(var(--space) * 2); min-height: 220px; max-height: min(60vh, 560px); overflow: auto;
}
.messages.messages-static { max-height: none; overflow: visible; }
.msg { display: grid; gap: 6px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: #0b132a; }
.msg.user { background: rgba(99,102,241,0.12); border-color: rgba(99,102,241,0.3); }
.msg .role { font-size: 12px; color: var(--muted); }
.msg .text { line-height: 1.6; white-space: pre-wrap; }

.chat-form { display: grid; gap: calc(var(--space) * 2); margin-top: calc(var(--space) * 2); }
.chat-form textarea { width: 100%; resize: vertical; border-radius: var(--radius); background: var(--card); color: var(--fg); border: 1px solid rgba(124,58,237,0.25); padding: 12px 14px; box-shadow: inset 0 0 24px rgba(124,58,237,0.08); }
.form-row { display: flex; gap: calc(var(--space) * 2); align-items: center; }
.hint { color: var(--muted); font-size: 13px; margin: 0; }

.btn { height: 44px; padding: 0 16px; border-radius: 12px; border: 1px solid transparent; background: var(--card); color: var(--fg); cursor: pointer; box-shadow: var(--glow); }
.btn-primary { background: linear-gradient(90deg, var(--primary), var(--primary-600)); border-color: rgba(255,122,26,0.6); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-secondary { border-color: var(--border); background: rgba(15,23,42,0.8); }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.btn:disabled { opacity: .6; cursor: not-allowed; }

.site-footer { border-top: 1px solid var(--border); margin-top: calc(var(--space) * 6); padding: calc(var(--space) * 3) 0; color: var(--muted); text-align:center }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,1px,1px); white-space: nowrap; border: 0; }

/* Blog styles */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: calc(var(--space) * 3); margin-top: calc(var(--space) * 3); }
.blog-card { 
  background: var(--card); 
  border: 1px solid var(--border); 
  border-radius: var(--radius); 
  padding: calc(var(--space) * 3); 
  transition: all 0.3s ease;
}
.blog-card:hover { 
  border-color: rgba(255,122,26,0.4); 
  box-shadow: 0 8px 32px rgba(255,122,26,0.12);
  transform: translateY(-2px);
}
.blog-card h3 { margin: 0 0 calc(var(--space) * 1); font-size: 18px; }
.blog-card h3 a { color: var(--fg); text-decoration: none; }
.blog-card h3 a:hover { color: var(--primary); }
.blog-card .excerpt { color: var(--muted); font-size: 14px; line-height: 1.5; margin: calc(var(--space) * 1) 0; }
.blog-card .meta { color: var(--muted); font-size: 12px; display: flex; gap: calc(var(--space) * 2); }

/* Article styles */
.article-header { margin-bottom: calc(var(--space) * 4); }
.article-meta { color: var(--muted); font-size: 14px; margin: calc(var(--space) * 1) 0; }
.article-content { line-height: 1.7; }
.article-content h2 { margin: calc(var(--space) * 4) 0 calc(var(--space) * 2); color: var(--primary); }
.article-content h3 { margin: calc(var(--space) * 3) 0 calc(var(--space) * 1); }
.article-content ul, .article-content ol { margin: calc(var(--space) * 2) 0; padding-left: calc(var(--space) * 3); }
.article-content li { margin: calc(var(--space) * 1) 0; }
.article-content a { color: var(--primary); text-decoration: none; border-bottom: 1px solid rgba(255,122,26,0.3); }
.article-content a:hover { border-bottom-color: var(--primary); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: calc(var(--space) * 3);
  margin: calc(var(--space) * 4) 0;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: calc(var(--space) * 3);
  display: grid;
  gap: calc(var(--space) * 1.5);
  box-shadow: 0 10px 30px rgba(15,23,42,0.35);
}

.feature-card h3 { margin: 0; font-size: 18px; display: flex; gap: calc(var(--space) * 1); align-items: center; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }
.feature-card span[aria-hidden="true"] { font-size: 22px; }

.internal-links {
  margin-top: calc(var(--space) * 4);
  padding: calc(var(--space) * 3);
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.internal-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: calc(var(--space) * 2);
  list-style: none;
  padding: 0;
  margin: calc(var(--space) * 2) 0 0;
}

.internal-links a { color: var(--primary); text-decoration: none; }
.internal-links a:hover { text-decoration: underline; }

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: calc(var(--space) * 2);
  font-size: 16px;
}

.contact-list a { color: var(--primary); text-decoration: none; font-weight: 600; }
.contact-list a:hover { text-decoration: underline; }

/* Breadcrumbs */
.breadcrumbs { margin: calc(var(--space) * 2) 0; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--primary); }

@media (max-width: 767px) {
  .hero { gap: calc(var(--space) * 2); }
  .cta-row { flex-direction: column; align-items: stretch; }
  .controls { grid-template-columns: 1fr; }
  .actions { gap: 6px; flex-wrap: wrap; }
  .actions a { padding:6px 10px; }
  .blog-grid { grid-template-columns: 1fr; gap: calc(var(--space) * 2); }
  .blog-card { padding: calc(var(--space) * 2); }
}