:root {
  --blue: #003;
  --blue-soft: #1a1a44;
  --blue-bg: #f0f0f5;
  --text: #000;
  --text-secondary: #5d5d68;
  --line: #d9d9df;
  --gray: #f5f5f7;
  --gray-2: #f7f7f7;
  --white: #fff;
  --green: #0a6;
  --red: #c33;
  --orange: #d82;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 24px rgba(0,0,0,0.1);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; scroll-behavior: smooth; }
body {
  background: var(--white);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, Helvetica, sans-serif;
  line-height: 1.3;
  -webkit-font-smoothing: antialiased;
}
.cn-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
input, select, textarea { outline: none; }

.cn-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 100;
}
.cn-header__inner {
  display: flex; align-items: center; gap: 28px; height: 64px;
}
.cn-logo {
  display: flex; align-items: center; gap: 8px; font-size: 1.1rem; font-weight: 700; flex-shrink: 0;
}
.cn-logo__mark { font-size: 1.3rem; color: var(--blue); }
.cn-logo__mark b { font-weight: 800; }
.cn-logo__mark i { font-style: normal; animation: blink 1.2s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.cn-nav { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.cn-nav a {
  padding: 8px 14px; font-size: 0.8rem; font-weight: 700; text-transform: uppercase;
  color: var(--text-secondary); border-radius: 0; transition: color .15s, background .15s;
  letter-spacing: 0.02em; white-space: nowrap;
}
.cn-nav a:hover { color: var(--text); background: var(--gray); }
.cn-nav a.active { color: var(--text); background: var(--blue-bg); }

.cn-hero {
  padding: 48px 0 40px; background: var(--white);
  border-bottom: 1px solid var(--line);
}
.cn-hero__inner { display: flex; flex-direction: column; gap: 8px; }
.cn-hero h1 { font-size: 2rem; font-weight: 800; margin: 0; line-height: 1.15; }
.cn-hero h1 em { color: var(--blue); font-style: normal; }
.cn-hero p { color: var(--text-secondary); font-size: 1rem; line-height: 1.5; margin: 4px 0 0; max-width: 640px; }

.cn-services { padding: 32px 0 48px; }
.cn-services__grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px;
}
.cn-service-card {
  display: block; padding: 20px; border: 1px solid var(--line);
  transition: border-color .15s, box-shadow .15s; cursor: pointer;
}
.cn-service-card:hover { border-color: var(--blue); box-shadow: var(--shadow-hover); }
.cn-service-card.active { border-color: var(--blue); background: var(--blue-bg); }
.cn-service-card__top { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.cn-service-card__top span { font-size: 0.75rem; font-weight: 800; color: var(--blue); }
.cn-service-card h3 { margin: 0; font-size: 0.85rem; font-weight: 700; }
.cn-service-card p { margin: 4px 0 0; font-size: 0.78rem; color: var(--text-secondary); line-height: 1.4; }

.cn-tool { display: block; padding: 0 0 60px; }
.cn-tool__header { margin-bottom: 24px; }
.cn-tool__header h2 { font-size: 1.4rem; font-weight: 800; margin: 0; }
.cn-tool__header p { margin: 6px 0 0; color: var(--text-secondary); font-size: 0.9rem; line-height: 1.4; }
.cn-tool__card {
  background: var(--white); border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.cn-tool__form { padding: 24px; border-bottom: 1px solid var(--line); }
.cn-tool__result { padding: 24px; }

.cn-field { display: flex; flex-direction: column; gap: 6px; }
.cn-field label { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--blue); letter-spacing: 0.03em; }
.cn-field input, .cn-field select {
  height: 48px; border: 1px solid var(--line); background: var(--white);
  padding: 0 14px; font-size: 0.95rem; color: var(--text); transition: border-color .15s;
}
.cn-field input:focus, .cn-field select:focus { border-color: var(--blue); }
.cn-field textarea {
  border: 1px solid var(--line); background: var(--white);
  padding: 12px 14px; font-size: 0.95rem; color: var(--text); resize: vertical; min-height: 48px;
}
.cn-field textarea:focus { border-color: var(--blue); }
.cn-form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }

.cn-btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 48px; padding: 0 24px; border: 0; border-radius: 0;
  background: var(--blue); color: #fff; font-weight: 800; font-size: 0.85rem;
  text-transform: uppercase; cursor: pointer; letter-spacing: 0.02em;
  transition: background .15s; white-space: nowrap;
}
.cn-btn:hover { background: var(--blue-soft); }
.cn-btn:disabled { cursor: wait; opacity: 0.6; }

.cn-result-empty { color: var(--text-secondary); font-size: 0.85rem; }
.cn-error { background: #fef2f2; border-left: 3px solid var(--red); padding: 16px 20px; color: var(--red); font-size: 0.85rem; }
.cn-loading { text-align: center; padding: 40px; color: var(--text-secondary); font-size: 0.85rem; }

.cn-badge {
  display: inline-block; padding: 2px 10px; font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.03em;
}
.cn-badge-ok { background: var(--green); color: #fff; }
.cn-badge-warn { background: var(--orange); color: #fff; }
.cn-badge-error { background: var(--red); color: #fff; }
.cn-badge-info { background: var(--line); color: var(--text-secondary); }

.cn-score { font-size: 2.2rem; font-weight: 800; color: var(--blue); }
.cn-score-label { color: var(--text-secondary); font-size: 0.8rem; }

.cn-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.cn-table td, .cn-table th { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.cn-table th { font-weight: 700; color: var(--blue); text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.03em; }
.cn-table tr:hover { background: var(--gray); }
.cn-table-wrap { overflow-x: auto; }

.cn-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.cn-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }

.cn-stat {
  background: var(--gray); padding: 20px; border-left: 2px solid var(--blue);
}
.cn-stat-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; color: var(--blue); letter-spacing: 0.03em; }
.cn-stat-value { font-size: 1.8rem; font-weight: 800; margin-top: 4px; }
.cn-stat-desc { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }

pre { margin: 0; white-space: pre-wrap; word-break: break-all; font-size: 0.78rem; }
.cn-monospace { font-family: "SF Mono", Monaco, "Cascadia Code", monospace; font-size: 0.78rem; }

.cn-footer {
  border-top: 1px solid var(--line); padding: 24px 0;
  color: var(--text-secondary); font-size: 0.8rem; text-align: center;
}

.speed-progress { height: 8px; margin-top: 16px; overflow: hidden; background: var(--line); }
.speed-bar { width: 0%; height: 100%; background: var(--blue); transition: width 180ms ease; }
.speed-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
#captcha-container { position: fixed; opacity: 0; pointer-events: none; z-index: 9999; }

.cn-proto-grid { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.cn-proto-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 10px 16px; border: 1px solid var(--line); min-width: 80px;
}
.cn-proto-version { font-size: 0.78rem; font-weight: 700; }
.cn-proto-status { font-size: 1.1rem; font-weight: 800; }
.cn-proto-comment { font-size: 0.68rem; line-height: 1.3; text-align: center; max-width: 140px; }
.cn-proto-safe { color: var(--green); border-color: var(--green); }
.cn-proto-unsafe { color: var(--red); border-color: var(--red); }
.cn-proto-ok-bg { background: #f0fdf4; }
.cn-proto-err-bg { background: #fef2f2; }

@media (max-width: 860px) {
  .cn-header__inner { gap: 12px; }
  .cn-nav { gap: 2px; }
  .cn-nav a { padding: 6px 8px; font-size: 0.72rem; }
  .cn-hero h1 { font-size: 1.5rem; }
  .cn-hero { padding: 32px 0 24px; }
  .cn-services__grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .cn-grid-2, .cn-grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .cn-nav a { font-size: 0.65rem; padding: 4px 6px; }
  .cn-logo { font-size: 0.95rem; }
  .cn-services__grid { grid-template-columns: repeat(2, 1fr); }
  .cn-form-row { flex-direction: column; }
  .cn-tool__form { padding: 16px; }
  .cn-tool__result { padding: 16px; }
}