:root {
  --bg: #ffffff;
  --text: #060606;
  --text-muted: #4b4b4b;
  --header-bg: #060606;
  --header-text: #ffffff;
  --primary: #21ffca;
  --primary-text: #ffffff;
  --tertiary: #f6f6f6;
  --link: #0052b7db;
  --border: #e3e3e3;
  --sans: "DM Sans", sans-serif;
  --mono: "IBM Plex Mono", monospace;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--header-bg);
  color: var(--header-text);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 19px;
  color: var(--header-text);
}

.logo:hover {
  text-decoration: none;
}

.main-nav > ul {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--header-text);
  font-size: 16px;
  font-weight: 500;
}

.main-nav > ul > li {
  position: relative;
}

.has-submenu {
  padding: 28px 0;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  display: block;
}

.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--header-bg);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 8px 0;
  min-width: 260px;
  list-style: none;
  margin: 0;
  z-index: 20;
}

.submenu li {
  border: none;
}

.submenu a {
  display: block;
  padding: 10px 18px;
  font-size: 14.5px;
  font-weight: 400;
  white-space: nowrap;
}

.submenu a:hover {
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--header-text);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 14px;
  cursor: pointer;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 15px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  border: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-text);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background: var(--tertiary);
}

/* ---------- Hero ---------- */

.hero {
  padding: 96px 0 80px;
}

.hero h1 {
  font-size: 52px;
  line-height: 1.15;
  margin: 0 0 20px;
  max-width: 820px;
  letter-spacing: -0.01em;
}

.hero .tagline {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 0 36px;
}

/* ---------- Sections ---------- */

section {
  padding: 72px 0;
}

.section-alt {
  background: var(--tertiary);
}

.section-head {
  margin-bottom: 40px;
}

.section-head h2 {
  font-size: 32px;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.section-head p {
  color: var(--text-muted);
  margin: 0;
  font-size: 16px;
}

/* ---------- Bio ---------- */

.bio {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: start;
}

.bio img {
  border-radius: 12px;
  width: 100%;
}

.bio h2 {
  font-size: 30px;
  margin: 0 0 4px;
}

.bio .role {
  font-family: var(--mono);
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 20px;
}

.bio ul {
  padding-left: 20px;
  margin: 0 0 24px;
  color: var(--text-muted);
  font-size: 15.5px;
}

.bio ul li {
  margin-bottom: 8px;
}

/* ---------- Areas of Expertise grid ---------- */

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.expertise-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px;
  color: var(--text);
}

.expertise-card:hover {
  border-color: var(--primary);
  text-decoration: none;
}

.expertise-card h3 {
  font-size: 18px;
  margin: 0;
}

/* ---------- Consultation process ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: left;
}

.step img {
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
}

.step p {
  font-size: 16px;
  margin: 0;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--header-bg);
  color: var(--header-text);
  text-align: center;
}

.cta-band h2 {
  margin: 0 0 24px;
  font-size: 28px;
}

/* ---------- Expertise detail page ---------- */

.expertise-detail {
  max-width: 720px;
}

.expertise-detail h1 {
  font-size: 36px;
  margin: 0 0 20px;
}

.expertise-detail p {
  font-size: 16.5px;
  color: var(--text-muted);
  margin: 0 0 20px;
}

.expertise-related {
  margin-top: 16px;
}

.expertise-related h3 {
  font-family: var(--mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0 0 14px;
}

.expertise-related ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.expertise-related a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--text);
}

.expertise-related a.active {
  border-color: var(--primary);
  background: var(--tertiary);
}

.expertise-related a:hover {
  text-decoration: none;
  border-color: var(--primary);
}

/* ---------- Contact page ---------- */

.contact-body {
  max-width: 560px;
}

.contact-body p {
  font-size: 17px;
  color: var(--text-muted);
}

.contact-body a {
  font-weight: 500;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--header-bg);
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 0;
}

.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer p {
  margin: 0;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.footer-links a:hover {
  color: #fff;
}

/* ---------- Responsive ---------- */

@media (max-width: 800px) {
  .nav-toggle {
    display: inline-block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--header-bg);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav > ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
  }

  .main-nav li {
    width: 100%;
  }

  .has-submenu {
    padding: 0;
  }

  .main-nav a {
    display: block;
    padding: 14px 0;
  }

  .submenu {
    display: none;
    position: static;
    border: none;
    background: transparent;
    padding: 0 0 0 14px;
    min-width: 0;
  }

  .has-submenu.open .submenu {
    display: block;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero .tagline {
    font-size: 17px;
  }

  .bio,
  .expertise-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .bio img {
    width: 160px;
  }
}