:root {
  --bg: #0a0a0c;
  --bg-alt: #121215;
  --card: #16161a;
  --border: #26262b;
  --red: #e0263a;
  --red-dim: #7a1420;
  --text: #e8e8ea;
  --text-muted: #9a9aa2;
  --font: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
}

a { color: var(--red); text-decoration: none; }
a:hover { color: #ff4a5c; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner { position: static; }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.5px;
}
.brand-mark { color: var(--text); }
.brand-mark-accent { color: var(--red); }
.main-nav a {
  color: var(--text-muted);
  margin-left: 28px;
  font-size: 0.95rem;
  font-weight: 500;
}
.main-nav a:hover, .main-nav a.active { color: var(--red); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(circle at top right, rgba(224,38,58,0.08), transparent 60%);
}
.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 16px;
  letter-spacing: -0.5px;
}
.hero-sub {
  color: var(--text-muted);
  max-width: 640px;
  font-size: 1.05rem;
}

/* Tools grid */
.tools-section { padding: 48px 0 80px; }
.tool-category { margin-bottom: 44px; }
.category-title {
  font-size: 1.1rem;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.tool-card:hover {
  border-color: var(--red-dim);
  transform: translateY(-2px);
}
.tool-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--text);
}
.tool-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Tool page */
.tool-page { padding: 48px 0 80px; }
.back-link {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.back-link:hover { color: var(--red); }
.tool-page h1 { margin-bottom: 10px; }
.tool-description { color: var(--text-muted); margin-bottom: 32px; max-width: 640px; }

.tool-form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  max-width: 640px;
}
.field-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.field-inline { margin-top: 18px; }
.field-message { margin-top: 18px; }

input[type="text"], input[type="password"], textarea, select, input[type="file"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.95rem;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--red);
}

.btn-primary {
  margin-top: 22px;
  background: var(--red);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn-primary:hover { background: #ff4a5c; color: #fff; }
.btn-primary:disabled { background: var(--red-dim); cursor: not-allowed; }

.tool-result {
  max-width: 640px;
  margin-top: 28px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.9rem;
}
.tool-result { white-space: normal; }
.result-table { width: 100%; border-collapse: collapse; }
.result-table > tr > td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  font-size: 0.9rem;
}
.result-table > tr:last-child > td { border-bottom: none; }
.result-table > tr > td:first-child {
  color: var(--text-muted);
  width: 34%;
  font-weight: 600;
  padding-top: 12px;
}

.sub-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.sub-table th {
  text-align: left;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--red);
  background: rgba(224,38,58,0.06);
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.sub-table td {
  padding: 8px 10px;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
}
.sub-table tr:last-child td { border-bottom: none; }

.sub-table-kv td:first-child {
  color: var(--text-muted);
  width: 38%;
  font-weight: 500;
}

.value-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.9rem;
}
.value-list li { margin-bottom: 4px; }

.value-empty {
  color: var(--text-muted);
  font-style: italic;
}

.tool-error {
  max-width: 640px;
  margin-top: 28px;
  background: rgba(224,38,58,0.08);
  border: 1px solid var(--red-dim);
  color: #ff8a94;
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 0.9rem;
}

/* Static pages */
.static-page { padding: 56px 0 80px; max-width: 720px; margin: 0 auto; }
.static-page h1 { margin-bottom: 24px; }
.static-page h2 { margin-top: 32px; font-size: 1.2rem; color: var(--red); }
.static-page p { color: var(--text-muted); }
.contact-list { list-style: none; padding: 0; color: var(--text-muted); }
.contact-list li { margin-bottom: 10px; }
.error-page { text-align: center; }
.error-page h1 { font-size: 3rem; color: var(--red); }

/* Footer */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  margin-top: 40px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding: 52px 0 36px;
  text-align: left;
}
.footer-brand-block { max-width: 300px; }
.footer-brand { font-weight: 700; font-size: 1.15rem; margin-bottom: 12px; }
.footer-desc { color: var(--text-muted); font-size: 0.88rem; margin: 0 0 18px; }

.footer-social { display: flex; gap: 10px; }
.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.footer-social a:hover { color: var(--red); border-color: var(--red-dim); }

.footer-col { text-align: left; }
.footer-col-group {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.footer-col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin: 0 0 16px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 11px; }
.footer-col a { color: var(--text); font-size: 0.88rem; }
.footer-col a:hover { color: var(--red); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 16px 0;
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  gap: 12px;
}
.footer-bottom-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}
.footer-bottom-company {
  color: var(--text-muted);
  font-size: 0.75rem;
}
.footer-bottom-copyright {
  color: var(--text-muted);
  font-size: 0.66rem;
  opacity: 0.8;
}
.footer-top-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-size: 0.9rem;
  flex-shrink: 0;
  position: absolute;
  right: 0;
}
.footer-top-link:hover { background: #ff4a5c; color: #fff; }

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
  }
  .main-nav.open { max-height: 220px; }
  .main-nav a {
    margin-left: 0;
    padding: 14px 24px;
    border-top: 1px solid var(--border);
    font-size: 0.95rem;
  }
  .main-nav a:first-child { border-top: none; }

  .hero h1 { font-size: 1.8rem; }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px 20px;
    padding: 40px 0 28px;
  }
  .footer-brand-block { grid-column: 1 / -1; max-width: 100%; }

  .footer-bottom-company { font-size: 0.72rem; }
  .footer-bottom-copyright { font-size: 0.64rem; }
}