:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #111111;
  --focus: #11111122;
  --radius: 10px;
  --container: 1000px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Noto Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Layout helpers */
.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.logo-mark {
  width: 10px;
  height: 10px;
  display: inline-block;
  background: var(--text);
  border-radius: 50%;
}

.logo-text {
  font-size: 1.1rem;
}

/* Nav (Second block) */
.site-nav {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.nav-inner {
  padding: 8px 0;
}

.menu {
  list-style: none;
  display: flex;
  gap: 18px;
  padding: 0;
  margin: 0;
  align-items: center;
}

.menu .spacer {
  flex: 1;
}

.menu a {
  text-decoration: none;
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  transition: background 120ms ease, color 120ms ease;
}

.menu a:hover,
.menu a:focus {
  background: #f7f7f7;
  outline: none;
}

.menu a.active {
  font-weight: 600;
}

/* Content (Third block) */
.site-main .content {
  padding: 36px 0 28px;
}

.post-header {
  margin-bottom: 16px;
}

.post-title {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.post-meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

.post-body h2 {
  font-size: clamp(1.2rem, 2.2vw, 1.4rem);
  margin-top: 28px;
  margin-bottom: 10px;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
  display: grid;
  gap: 8px;
}

.post-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}

.post-link {
  color: var(--text);
  text-decoration: none;
}

.post-link:hover,
.post-link:focus {
  text-decoration: underline;
  outline: none;
}

.post-date {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Contact (Fourth block) */
.contact {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
}

.contact h2 {
  margin: 0 0 14px;
  font-size: 1.2rem;
}

.contact-form {
  display: grid;
  gap: 14px;
}

.contact-form .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  font-size: 0.95rem;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 12px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input::placeholder,
textarea::placeholder {
  color: #9aa0a6;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #c8cdd4;
  box-shadow: 0 0 0 6px var(--focus);
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.btn {
  appearance: none;
  border: 1px solid var(--text);
  background: var(--text);
  color: #fff;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 80ms ease, filter 120ms ease, background 120ms ease, color 120ms ease;
}

.btn:hover {
  filter: brightness(0.95);
}

.btn:active {
  transform: translateY(1px);
}

.form-note {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

/* Footer (Fifth block) */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.footer-inner {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0 26px;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--text);
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 720px) {
  .menu {
    flex-wrap: wrap;
    gap: 10px 14px;
  }
  .menu .spacer {
    display: none;
  }
  .contact-form .grid {
    grid-template-columns: 1fr;
  }
}