:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #eef4f7;
  --text: #17212b;
  --muted: #5b6875;
  --line: #d7e0e7;
  --accent: #1f6f78;
  --accent-dark: #174f57;
  --accent-soft: #dbecee;
  --secondary: #7a5c28;
  --shadow: 0 18px 45px rgba(23, 33, 43, 0.08);
  --radius: 8px;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(31, 111, 120, 0.35);
  outline-offset: 3px;
}

ul {
  margin: 0;
  padding: 0;
}

.container {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.section {
  padding: 88px 0;
  scroll-margin-top: 82px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 252, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

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

.brand {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-menu a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hero {
  padding-top: 96px;
  background:
    linear-gradient(135deg, rgba(219, 236, 238, 0.9), rgba(248, 250, 252, 0.88)),
    var(--bg);
}

.hero-grid,
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.35fr);
  gap: 56px;
  align-items: start;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.7rem, 3vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.08rem;
  line-height: 1.25;
}

.hero-subtitle {
  max-width: 720px;
  margin-bottom: 14px;
  color: var(--text);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.hero-summary,
.section-body p,
.contact-card p {
  color: var(--muted);
}

.hero-summary {
  max-width: 700px;
  margin-bottom: 28px;
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 700;
}

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

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

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

.button.secondary:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.hero-panel,
.feature-card,
.project-card,
.skill-group,
.roadmap-item,
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 28px;
}

.hero-panel h2 {
  margin-bottom: 16px;
  font-size: 1.2rem;
}

.focus-list {
  display: grid;
  gap: 10px;
  list-style: none;
}

.focus-list li {
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.section-body p:last-child {
  margin-bottom: 0;
}

.process-list,
.interest-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.process-list span,
.interest-grid span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 650;
}

.skills-grid,
.project-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.skill-group {
  padding: 24px;
}

.skill-group ul,
.project-points {
  display: grid;
  gap: 8px;
  padding-left: 18px;
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  padding: 0 0 22px 22px;
  border-left: 2px solid var(--line);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-meta,
.card-meta,
.roadmap-status {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--secondary);
  font-size: 0.82rem;
  font-weight: 800;
}

.feature-card {
  padding: 28px;
}

.project-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
}

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

.project-points {
  margin-bottom: 22px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--accent-dark);
  font-weight: 700;
}

.project-links a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.roadmap {
  display: grid;
  gap: 16px;
}

.roadmap-item {
  padding: 24px;
}

.roadmap-item.current {
  border-color: rgba(31, 111, 120, 0.35);
}

.roadmap-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.contact-section {
  padding-bottom: 56px;
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
  padding: 32px;
}

.contact-links {
  display: grid;
  gap: 10px;
  min-width: 220px;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--accent-dark);
  font-weight: 700;
}

.contact-links a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 20px;
  color: var(--muted);
  font-size: 0.94rem;
}

.footer-content p {
  margin: 0;
}

.footer-content a {
  color: var(--accent-dark);
  font-weight: 700;
}

.error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 32px;
  background:
    linear-gradient(135deg, rgba(219, 236, 238, 0.9), rgba(248, 250, 252, 0.88)),
    var(--bg);
}

.error-card {
  width: min(100%, 680px);
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.error-card h1 {
  margin-bottom: 16px;
  font-size: clamp(2.4rem, 6vw, 4.4rem);
}

.error-card p {
  max-width: 560px;
  color: var(--muted);
}

@media (max-width: 980px) {
  .hero-grid,
  .section-grid,
  .contact-card {
    grid-template-columns: 1fr;
  }

  .skills-grid,
  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-links {
    min-width: 0;
  }
}

@media (max-width: 760px) {
  .section {
    padding: 64px 0;
  }

  .hero {
    padding-top: 72px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu a {
    border-radius: var(--radius);
  }

  .skills-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel,
  .feature-card,
  .project-card,
  .skill-group,
  .roadmap-item,
  .contact-card {
    padding: 22px;
  }

  .footer-content {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 460px) {
  .container {
    width: min(100% - 24px, var(--container));
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .process-list,
  .interest-grid {
    flex-direction: column;
  }
}