:root {
  --primary: #16324F;
  --secondary: #1E6F78;
  --background: #FFFFFF;
  --accent: #F5F7F8;
  --text: #172331;
  --muted: #5F6F7D;
  --border: #DCE4E8;
  --focus: rgba(30, 111, 120, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  color-scheme: light;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration-color: rgba(22, 50, 79, 0.28);
  text-underline-offset: 0.24em;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

a:hover {
  color: var(--secondary);
  text-decoration-color: currentColor;
}

.site-main {
  min-height: calc(100vh - 76px);
  display: flex;
  align-items: center;
  padding: 8vh clamp(22px, 5vw, 80px) 6vh;
}

.intro {
  width: min(760px, 100%);
  margin: 0 auto;
}

.kicker {
  margin: 0 0 24px;
  color: var(--secondary);
  font-size: 0.93rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--primary);
  font-size: clamp(2.45rem, 7vw, 5rem);
  line-height: 1.03;
  font-weight: 720;
  letter-spacing: 0;
}

.subtitle {
  margin: 20px 0 0;
  color: var(--secondary);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  font-weight: 600;
}

.description {
  margin-top: 34px;
  max-width: 690px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.18rem);
}

.description p {
  margin: 0 0 16px;
}

.topics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.topics li {
  padding: 8px 13px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--accent);
  color: var(--primary);
  font-size: 0.98rem;
}

.contact-button,
.admin-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  margin-top: 42px;
  padding: 0 24px;
  border: 1px solid var(--primary);
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.contact-button:hover,
.admin-button:hover {
  background: var(--secondary);
  border-color: var(--secondary);
  transform: translateY(-1px);
}

.contact-button:focus-visible,
.admin-button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
}

.site-footer {
  min-height: 76px;
  display: flex;
  align-items: center;
  padding: 0 clamp(22px, 5vw, 80px) 24px;
  color: #758290;
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  gap: 10px;
}

.plain-page {
  max-width: 830px;
  margin: 0 auto;
  padding: 64px clamp(22px, 5vw, 46px);
}

.plain-page h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
}

.plain-page h2 {
  margin: 38px 0 10px;
  color: var(--primary);
  font-size: 1.22rem;
  line-height: 1.35;
}

.plain-page p,
.plain-page li {
  color: var(--muted);
  font-size: 1.02rem;
}

.back-link {
  display: inline-block;
  margin-bottom: 34px;
  color: var(--secondary);
  font-weight: 650;
}

.admin-page {
  min-height: 100vh;
  background: var(--accent);
  padding: 42px 18px;
}

.admin-panel {
  width: min(900px, 100%);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}

.admin-panel h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.admin-field {
  display: grid;
  gap: 7px;
  margin-top: 18px;
}

.admin-field.full {
  grid-column: 1 / -1;
}

.admin-field label {
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 700;
}

.admin-field input,
.admin-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 13px;
  color: var(--text);
  font: inherit;
}

.admin-field textarea {
  min-height: 150px;
  resize: vertical;
}

.admin-message {
  margin: 24px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--secondary);
  background: var(--accent);
  color: var(--primary);
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 26px;
}

.admin-actions .admin-button {
  margin-top: 0;
}

.logout-link {
  color: var(--muted);
  font-weight: 650;
}

@media (max-width: 700px) {
  .site-main {
    align-items: flex-start;
    padding-top: 58px;
  }

  .contact-button,
  .admin-button {
    width: 100%;
  }

  .admin-grid {
    grid-template-columns: 1fr;
  }
}