:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e5e7eb;
  --shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
  --input-bg: #fff;
  --tag-bg: #eef2ff;
  --tag-text: #4338ca;
}

body.dark-theme {
  --bg: #111827;
  --surface: #1f2937;
  --text: #f9fafb;
  --muted: #cbd5e1;
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --border: #374151;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  --input-bg: #374151;
  --tag-bg: #312e81;
  --tag-text: #bfdbfe;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.2s ease, color 0.2s ease;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.site-header,
.site-footer {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.site-header h1,
.site-header p {
  margin: 0;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
}

.brand-link,
.button,
.contact-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.brand-link:hover,
.button:hover,
.contact-toggle:hover {
  transform: translateY(-1px);
  background: var(--primary-dark);
}

.contact-panel {
  padding-bottom: 1.5rem;
}

.contact-form {
  display: grid;
  gap: 1rem;
  max-width: 28rem;
  margin-left: auto;
  padding: 1.25rem;
  border-radius: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.contact-form-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.contact-form-header h3 {
  margin: 0;
}

.contact-close {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.4rem;
  cursor: pointer;
}

.contact-form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
}

.hero {
  display: grid;
  gap: 2rem;
  padding: 3rem 0 2rem;
}

.hero h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 1rem;
}

.hero p {
  max-width: 45rem;
  margin: 0;
  color: var(--muted);
}

.search-card {
  padding: 1.5rem;
  border-radius: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: grid;
  gap: 1rem;
}

.search-card label {
  font-size: 0.95rem;
  color: var(--muted);
}

.search-card input,
.search-card select {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--input-bg);
  color: var(--text);
}

.posts-section {
  padding-bottom: 4rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-header h3 {
  margin: 0;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.post-card h4 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.post-card p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.post-card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.post-card .tag {
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.empty-state {
  color: var(--muted);
  margin-top: 1.5rem;
  display: none;
}

.post-detail {
  padding: 2rem 0 4rem;
}

.post-detail .post-card {
  padding: 2rem;
}

.post-detail h2 {
  margin-top: 0;
}

.post-detail .post-content {
  margin-top: 1.5rem;
  color: var(--text);
}

.post-detail .post-content p {
  margin: 1.1rem 0;
}

.post-detail .post-content h3 {
  margin-top: 2rem;
}

@media (max-width: 760px) {
  .header-inner,
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer {
    padding: 1.5rem 0 2rem;
  }
}