/* Tocc Signal — Brand Stylesheet */

:root {
  --tocc-navy: #1B2A4A;
  --tocc-red: #F84C3D;
  --tocc-red-dark: #e0392e;
  --tocc-teal: #0E8A7E;
  --tocc-white: #FFFFFF;
  --tocc-light-gray: #F5F5F5;
  --tocc-dark-text: #111827;
  --tocc-body-text: #374151;
  --tocc-muted: #6B7280;
  --tocc-lighter-muted: #9CA3AF;
  --tocc-border: #E5E7EB;

  --font-body: 'DM Sans', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: 'Space Mono', ui-monospace, SFMono-Regular, monospace;
  --font-logo: 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --max-width: 720px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--tocc-body-text);
  background: var(--tocc-white);
  line-height: 1.7;
}

/* Header */
.signal-header {
  background: var(--tocc-navy);
  padding: 16px 24px;
}

.signal-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.signal-logo {
  font-family: var(--font-logo);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  text-decoration: none;
  line-height: 1;
}

.signal-logo .at { color: var(--tocc-red); }
.signal-logo .text { color: #f0f0eb; }
.signal-logo .dot { color: var(--tocc-red); }

.signal-nav-link {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: #9CA3AF;
  text-decoration: none;
  transition: color 0.15s;
}

.signal-nav-link:hover {
  color: #f0f0eb;
}

/* Main content */
.signal-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* Index page */
.signal-page-title {
  font-family: var(--font-body);
  font-size: 2rem;
  font-weight: 700;
  color: var(--tocc-dark-text);
  margin-bottom: 4px;
}

.signal-tagline {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--tocc-muted);
  margin-bottom: 48px;
}

.signal-post-list {
  list-style: none;
}

.signal-post-item {
  padding: 28px 0;
  border-bottom: 1px solid var(--tocc-border);
}

.signal-post-item:first-child {
  padding-top: 0;
}

.signal-post-item:last-child {
  border-bottom: none;
}

.signal-post-link {
  text-decoration: none;
  display: block;
}

.signal-post-link:hover .signal-post-title {
  color: var(--tocc-red);
}

.signal-post-title {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--tocc-dark-text);
  line-height: 1.3;
  margin-bottom: 6px;
  transition: color 0.15s;
}

.signal-post-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--tocc-lighter-muted);
  margin-bottom: 8px;
}

.signal-post-description {
  font-size: 0.95rem;
  color: var(--tocc-muted);
  line-height: 1.6;
}

/* Single post */
.signal-article-title {
  font-family: var(--font-body);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--tocc-dark-text);
  line-height: 1.2;
  margin-bottom: 12px;
}

.signal-article-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--tocc-lighter-muted);
  margin-bottom: 40px;
}

.signal-article-meta a {
  color: var(--tocc-red);
  text-decoration: none;
}

.signal-article-meta a:hover {
  text-decoration: underline;
}

/* Post body */
.signal-content h2 {
  font-family: var(--font-body);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--tocc-dark-text);
  margin-top: 48px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.signal-content h3 {
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--tocc-dark-text);
  margin-top: 36px;
  margin-bottom: 12px;
}

.signal-content p {
  margin-bottom: 20px;
}

.signal-content a {
  color: var(--tocc-red);
  text-decoration: underline;
  text-decoration-color: rgba(248, 76, 61, 0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s;
}

.signal-content a:hover {
  text-decoration-color: var(--tocc-red);
}

.signal-content strong {
  font-weight: 700;
  color: var(--tocc-dark-text);
}

.signal-content blockquote {
  border-left: 3px solid var(--tocc-red);
  margin: 28px 0;
  padding: 4px 0 4px 20px;
  color: var(--tocc-muted);
  font-style: italic;
}

.signal-content blockquote p {
  margin-bottom: 0;
}

.signal-content ul, .signal-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.signal-content li {
  margin-bottom: 8px;
}

.signal-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--tocc-light-gray);
  padding: 2px 6px;
  border-radius: 3px;
}

.signal-content pre {
  background: var(--tocc-navy);
  color: #e5e7eb;
  padding: 20px 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 24px;
  line-height: 1.5;
}

.signal-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  color: inherit;
}

.signal-content hr {
  border: none;
  border-top: 1px solid var(--tocc-border);
  margin: 40px 0;
}

.signal-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 24px 0;
}

/* CTA */
.signal-cta {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--tocc-border);
  font-size: 0.95rem;
  color: var(--tocc-body-text);
}

.signal-cta .at {
  font-family: var(--font-logo);
  color: var(--tocc-red);
  font-weight: 700;
  font-size: 1.05em;
}

.signal-cta a {
  color: var(--tocc-red);
  text-decoration: none;
  font-weight: 600;
}

.signal-cta a:hover {
  text-decoration: underline;
}

/* Footer */
.signal-footer {
  border-top: 1px solid var(--tocc-border);
  padding: 24px;
  text-align: center;
}

.signal-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.8rem;
  color: var(--tocc-lighter-muted);
}

.signal-footer a {
  color: var(--tocc-lighter-muted);
  text-decoration: none;
}

.signal-footer a:hover {
  color: var(--tocc-muted);
}

.signal-footer-sep {
  margin: 0 8px;
}

/* Responsive */
@media (max-width: 640px) {
  .signal-main {
    padding: 32px 20px 64px;
  }

  .signal-page-title {
    font-size: 1.6rem;
  }

  .signal-article-title {
    font-size: 1.7rem;
  }

  .signal-post-title {
    font-size: 1.15rem;
  }

  .signal-content h2 {
    font-size: 1.3rem;
  }

  .signal-tagline {
    margin-bottom: 32px;
  }
}