/* ─── Reset & Base ─────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #374151;
  background: transparent;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(150deg, #ffffff 30%, rgba(30, 144, 255, var(--grad-blue, 0.10)) 100%);
  pointer-events: none;
}

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

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

ul {
  list-style: none;
}

/* ─── Tokens ────────────────────────────────────────────────────── */
:root {
  --navy:      #1B2A4A;
  --dark-gray: #374151;
  --mid-gray:  #6B7280;
  --light-gray:#F0F2F5;
  --off-white: #F8F9FA;
  --white:     #FFFFFF;
  --max-w:     1100px;
  --section-v: 76px;
  --transition: 150ms ease;
}

/* ─── Layout helpers ─────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-v) 0;
}

.section--alt {
  background: transparent;
}

/* ─── Section labels & headings ──────────────────────────────────── */
.section-label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid-gray);
  margin-bottom: 8px;
}

.section-heading {
  font-size: 32px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 40px;
  letter-spacing: -0.02em;
}

/* ─── Nav ─────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--light-gray);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.nav-logo:hover {
  opacity: 0.75;
  transition: opacity var(--transition);
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--mid-gray);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--navy);
}

/* ─── Hamburger ───────────────────────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--navy);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ─── Mobile menu overlay ─────────────────────────────────────────── */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background-color: var(--white);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu-close {
  position: absolute;
  top: 18px;
  right: 24px;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--mid-gray);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition);
}

.mobile-menu-close:hover {
  color: var(--navy);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.mobile-nav-link {
  font-size: 28px;
  font-weight: 600;
  color: var(--navy);
  transition: opacity var(--transition);
}

.mobile-nav-link:hover {
  opacity: 0.6;
}

/* ─── Hero ─────────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 40px;
}

.hero-inner {
  max-width: 640px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.hero-name {
  font-size: 64px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 24px;
  font-weight: 300;
  color: var(--mid-gray);
  line-height: 1.4;
}

.hero-bio {
  font-size: 16px;
  color: var(--mid-gray);
  max-width: 480px;
  line-height: 1.6;
  margin-top: 4px;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 12px;
}

/* ─── Pills ─────────────────────────────────────────────────────────── */
.pill {
  display: inline-block;
  padding: 9px 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 6px;
  background-color: var(--white);
  transition: background-color var(--transition), color var(--transition);
  cursor: pointer;
}

.pill:hover {
  background-color: var(--navy);
  color: var(--white);
}

/* ─── Project cards ───────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  position: relative;
  background-color: var(--white);
  border-top: 4px solid var(--navy);
  border-radius: 6px;
  padding: 28px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-link-arrow {
  position: absolute;
  top: 20px;
  right: 20px;
  color: var(--mid-gray);
  transition: color var(--transition);
  line-height: 1;
}

.card-link-arrow:hover {
  color: var(--navy);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--navy);
  padding-right: 28px;
  line-height: 1.3;
}

.card-desc {
  font-size: 14px;
  color: var(--mid-gray);
  line-height: 1.6;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.tag {
  font-size: 13px;
  color: var(--mid-gray);
  background-color: var(--light-gray);
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 400;
}

/* ─── About ────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 56px;
  align-items: start;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-text p {
  font-size: 16px;
  color: var(--dark-gray);
  line-height: 1.6;
}

.facts-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--light-gray);
}

.fact-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 13px 0;
  border-bottom: 1px solid var(--light-gray);
}

.fact-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.fact-value {
  font-size: 15px;
  color: var(--dark-gray);
  font-weight: 400;
}

/* ─── Skills ────────────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.skills-col-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skills-list li {
  font-size: 16px;
  color: var(--dark-gray);
  line-height: 1.4;
}

/* ─── Contact ───────────────────────────────────────────────────────── */
#contact {
  background-color: var(--white);
  border-top: 1px solid var(--light-gray);
}

.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.contact-heading {
  font-size: 36px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.02em;
}

.contact-body {
  font-size: 16px;
  color: var(--mid-gray);
  max-width: 400px;
}

.contact-email-plain {
  font-size: 16px;
  color: var(--mid-gray);
  letter-spacing: 0.01em;
  margin-top: 4px;
  user-select: all;
}

.contact-pill {
  margin-top: 8px;
}

.contact-links {
  display: flex;
  gap: 28px;
  margin-top: 8px;
}

.contact-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--mid-gray);
  transition: color var(--transition);
}

.contact-links a:hover {
  color: var(--navy);
}

/* ─── Footer ────────────────────────────────────────────────────────── */
.footer {
  padding: 32px 40px;
  text-align: center;
  border-top: 1px solid rgba(240, 242, 245, 0.6);
  background: transparent;
}

.footer p {
  font-size: 13px;
  color: var(--mid-gray);
}

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --section-v: 52px;
  }

  .container {
    padding: 0 24px;
  }

  /* Nav */
  .nav-inner {
    padding: 0 24px;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: 64px 24px;
    min-height: calc(100vh - 60px);
  }

  .hero-name {
    font-size: 44px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

  /* Cards */
  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  /* Skills */
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  /* Section heading */
  .section-heading {
    font-size: 26px;
    margin-bottom: 40px;
  }

  .contact-heading {
    font-size: 28px;
  }

  .footer {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-pills {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .pill {
    width: 200px;
    text-align: center;
  }
}