:root {
  --bg: #ffffff;
  --panel: #f7f9fc;
  --panel-2: #eef1f6;
  --border: #dde3ec;
  --text: #141a21;
  --muted: #5b6b7c;
  --accent: #3ba7ff;
  --accent-2: #0f9d68;
  --danger: #d9342b;
  --warn: #b3760a;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
  gap: 10px;
}

.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark { font-weight: 700; font-size: 1.3rem; color: var(--accent); letter-spacing: 0.5px; }
.brand-sub { color: var(--muted); font-size: 0.9rem; }

.topnav { display: flex; flex-wrap: wrap; gap: 6px; }
.topnav button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
}
.topnav button:hover { color: var(--text); border-color: var(--border); }
.topnav button.active { color: var(--bg); background: var(--accent); font-weight: 600; }
.topnav a {
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.85rem;
  white-space: nowrap;
  text-decoration: none;
}
.topnav a:hover { color: var(--text); border-color: var(--border); }
.brand-link { text-decoration: none; color: inherit; display: flex; align-items: baseline; gap: 10px; }

.langswitch { display: flex; gap: 4px; }
.langswitch button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
}
.langswitch button.active { color: #fff; background: var(--accent); border-color: var(--accent); }

.app { max-width: 1100px; margin: 0 auto; padding: 24px 20px 60px; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.tool-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card h3 { margin: 0 0 6px; font-size: 1rem; color: var(--text); }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.85rem; line-height: 1.4; }
.tool-card .badge {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--accent-2);
  border: 1px solid var(--accent-2);
  border-radius: 999px;
  padding: 1px 8px;
  margin-bottom: 8px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.panel h2 { margin-top: 0; }
.panel .desc { color: var(--muted); font-size: 0.9rem; margin-bottom: 16px; }

.back-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: 16px;
  display: inline-block;
}

.form-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  align-items: center;
}
.form-row label { font-size: 0.85rem; color: var(--muted); margin-right: 4px; }
input[type="text"], input[type="number"], select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
  min-width: 200px;
}
input[type="checkbox"] { accent-color: var(--accent); }
button.primary {
  background: var(--accent);
  color: #04121e;
  border: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
button.primary:hover { filter: brightness(1.08); }
button.primary:disabled { opacity: 0.6; cursor: not-allowed; }
button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
}

.result-box {
  background: #f4f6fa;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin-top: 14px;
  max-height: 480px;
  overflow: auto;
}
.result-box pre { margin: 0; white-space: pre-wrap; word-break: break-word; font-size: 0.82rem; color: #1c2733; }

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 0.72rem; font-weight: 600; }
.tag.ok { background: rgba(52,211,153,0.15); color: var(--accent-2); }
.tag.warn { background: rgba(251,191,36,0.15); color: var(--warn); }
.tag.bad { background: rgba(248,113,113,0.15); color: var(--danger); }

.loading { color: var(--muted); font-size: 0.9rem; }
.error-msg { color: var(--danger); font-size: 0.9rem; margin-top: 10px; }

.stat-row { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 10px; }
.stat { background: var(--panel-2); border-radius: 8px; padding: 10px 16px; min-width: 100px; }
.stat .num { font-size: 1.3rem; font-weight: 700; color: var(--accent); }
.stat .label { font-size: 0.75rem; color: var(--muted); }

.gauge-bar { height: 8px; background: var(--panel-2); border-radius: 999px; overflow: hidden; margin-top: 8px; }
.gauge-bar > div { height: 100%; background: var(--accent); transition: width 0.2s; }

.note { font-size: 0.78rem; color: var(--muted); margin-top: 8px; font-style: italic; }

.footer {
  text-align: center;
  padding: 24px 16px;
  margin-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.footer p { margin: 4px 0; }
.footer-copy { font-size: 0.78rem; }
.footer-link { color: var(--muted); }
.footer-link:hover { color: var(--accent); }

/* ---- Статьи (SEO-контент) ---- */
.article { max-width: 720px; margin: 0 auto; padding: 32px 20px 60px; line-height: 1.65; }
.article h1 { font-size: 1.7rem; margin: 0 0 6px; }
.article .lead { color: var(--muted); font-size: 0.95rem; margin-bottom: 24px; }
.article h2 { font-size: 1.25rem; margin: 32px 0 10px; }
.article p { margin: 0 0 14px; }
.article ul, .article ol { margin: 0 0 14px; padding-left: 22px; }
.article li { margin-bottom: 6px; }
.article code { background: var(--panel-2); border-radius: 4px; padding: 1px 6px; font-size: 0.88em; }
.article .cta {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 28px 0;
  text-decoration: none;
  color: var(--text);
}
.article .cta strong { color: var(--accent); }
.article .cta:hover { border-color: var(--accent); }
.breadcrumb { max-width: 720px; margin: 20px auto 0; padding: 0 20px; font-size: 0.82rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.lang-links { font-size: 0.8rem; }
.lang-links a { color: var(--muted); margin-left: 8px; text-decoration: none; border: 1px solid var(--border); border-radius: 8px; padding: 5px 10px; }
.lang-links a:hover { color: var(--text); border-color: var(--accent); }

.article-list { max-width: 720px; margin: 0 auto; padding: 32px 20px 60px; }
.article-list h1 { font-size: 1.6rem; margin-bottom: 20px; }
.article-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 12px;
  text-decoration: none;
  color: var(--text);
}
.article-card:hover { border-color: var(--accent); }
.article-card h2 { margin: 0 0 6px; font-size: 1.05rem; }
.article-card p { margin: 0; color: var(--muted); font-size: 0.88rem; }