:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-muted: #eef2f7;
  --text: #172033;
  --text-muted: #5d6b82;
  --heading: #101827;
  --border: #d9e1ec;
  --accent: #1f4f8f;
  --accent-dark: #183d6e;
  --accent-soft: #e6f0ff;
  --shadow: 0 18px 45px rgba(16, 24, 39, 0.08);
  --radius: 20px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: inherit;
  text-decoration: none;
}

p {
  margin: 0 0 1rem;
}

h1,
h2,
h3 {
  color: var(--heading);
  line-height: 1.15;
  margin: 0 0 1rem;
}

h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.narrow {
  width: min(100% - 2rem, 860px);
}

.section {
  padding: 6.5rem 0;
}

.section-muted {
  background: var(--surface-muted);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 250, 252, 0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(217, 225, 236, 0.8);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  font-weight: 800;
  color: var(--heading);
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.nav-links a {
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  padding: 10px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--heading);
  margin: 5px 0;
  border-radius: 999px;
}

.hero {
  padding-top: 7.5rem;
  background:
    radial-gradient(circle at top left, rgba(31, 79, 143, 0.16), transparent 36rem),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr);
  gap: 3rem;
  align-items: center;
}

.eyebrow,
.section-label,
.article-status {
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  margin-bottom: 0.9rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text);
  max-width: 760px;
  margin-bottom: 1.4rem;
}

.hero-copy {
  color: var(--text-muted);
  max-width: 740px;
  font-size: 1.05rem;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button:hover,
.button:focus {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
}

.button.primary:hover,
.button.primary:focus {
  background: var(--accent-dark);
}

.button.secondary {
  background: var(--surface);
  color: var(--accent);
  border-color: var(--border);
}

.hero-card,
.card,
.work-item,
.article-card,
.theme-panel,
.contact-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}

.hero-card {
  padding: 2rem;
}

.profile-initials {
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 900;
  border-radius: 22px;
  margin-bottom: 1.3rem;
  letter-spacing: -0.04em;
}

.hero-card p {
  color: var(--text-muted);
}

.quick-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.quick-list li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--text-muted);
}

.quick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68rem;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 2.8rem;
}

.section-heading p:not(.section-label) {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  gap: 1.2rem;
}

.five-grid {
  grid-template-columns: repeat(5, 1fr);
}

.card {
  padding: 1.4rem;
}

.card p,
.work-item p,
.article-card p,
.theme-panel p,
.contact-panel p {
  color: var(--text-muted);
}

.work-list {
  display: grid;
  gap: 1.1rem;
}

.work-item {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 2rem;
  padding: 1.6rem;
}

.tag {
  display: inline-flex;
  margin-bottom: 0.8rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
}

.theme-panel {
  padding: 2rem;
  max-width: 900px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.article-card {
  padding: 1.5rem;
}

.article-status {
  font-size: 0.72rem;
}

.contact-section {
  background:
    radial-gradient(circle at bottom right, rgba(31, 79, 143, 0.16), transparent 28rem),
    var(--bg);
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 2.3rem;
}

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.footer-grid p {
  margin: 0;
}

@media (max-width: 1024px) {
  .five-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .hero-card {
    max-width: 560px;
  }
}

@media (max-width: 760px) {
  .section {
    padding: 4.5rem 0;
  }

  .hero {
    padding-top: 5.5rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
  }

  .nav-links.active {
    display: flex;
  }

  .five-grid,
  .work-item,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .contact-actions {
    margin-top: 0;
  }

  .footer-grid {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 1.2rem, var(--max-width));
  }

  .hero-actions,
  .contact-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-card,
  .card,
  .work-item,
  .article-card,
  .theme-panel,
  .contact-panel {
    border-radius: 16px;
  }
}