/* ===== Variables ===== */
:root {
  --color-bg: #ecfdfa;
  --color-bg-alt: #d1faf5;
  --color-text: #134e4a;
  --color-text-muted: #0f766e;
  --color-accent: #0d9488;
  --color-accent-hover: #0f766e;
  --color-border: #99f6e4;
  --font-sans: "Montserrat", system-ui, sans-serif;
  --space-xs: 0.35rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.25rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 2.5rem;
  --max-width: 720px;
  --header-height: 56px;
  --radius: 6px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

ul {
  margin: 0 0 var(--space-sm);
  padding-left: 1.25rem;
}

li {
  margin-bottom: var(--space-xs);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: rgba(236, 253, 250, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: var(--space-md);
}

.nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Main ===== */
main {
  padding-top: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

/* ===== Sections ===== */
.section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section-compact {
  padding: var(--space-xl) 0;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
}

/* ===== Hero ===== */
.hero {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  min-height: 45vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-sm);
}

.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(2.25rem, 7vw, 3.5rem);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}

.hero-title-accent {
  color: var(--color-accent);
  font-style: italic;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-lg);
  max-width: 32ch;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
  text-decoration: none;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  text-decoration: none;
}

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

.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

/* ===== About ===== */
.about-content {
  max-width: 58ch;
}

.about-lead {
  font-size: 1.1rem;
  margin: 0 0 var(--space-sm);
}

.about-meta {
  margin-top: var(--space-md);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.about-meta a {
  color: var(--color-accent);
}

/* ===== Experience / Timeline ===== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.timeline-item {
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.timeline-meta h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
}

.timeline-meta .company {
  font-weight: 500;
  color: var(--color-text);
  margin: 0 0 var(--space-xs);
}

.timeline-meta .date {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-sm);
}

.timeline-desc {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ===== Education ===== */
.education-grid {
  display: grid;
  gap: var(--space-md);
}

.education-card {
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

.education-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
}

.education-card .school {
  color: var(--color-text-muted);
  margin: 0 0 var(--space-xs);
}

.education-card .date {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-md);
}

.skill-group h4,
.certifications h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--color-text);
}

.skill-group p,
.certifications p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0;
}

.certifications {
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* ===== Projects ===== */
.projects-content p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text-muted);
}

.projects-content p:last-child {
  margin-bottom: 0;
}

/* ===== Extra ===== */
.extra-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.extra-grid h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
}

.extra-grid p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===== Contact ===== */
.section-contact {
  background: var(--color-bg-alt);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  padding-left: max(var(--space-lg), calc(50vw - var(--max-width) / 2));
  padding-right: max(var(--space-lg), calc(50vw - var(--max-width) / 2));
}

.contact-lead {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
  max-width: 42ch;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.contact-link {
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  padding: var(--space-md) var(--space-lg);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: var(--space-lg);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.2s, opacity 0.2s, visibility 0.2s;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav a {
    padding: var(--space-sm) 0;
    font-size: 1rem;
  }

  main {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

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

  .hero {
    min-height: 40vh;
    padding-top: var(--space-xl);
  }

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

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

  .section-contact {
    margin-left: 0;
    margin-right: 0;
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
}

@media (max-width: 480px) {
  .header {
    padding: 0 var(--space-md);
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .contact-links {
    flex-direction: column;
  }
}