/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Design tokens */
:root {
  --color-bg: #fafaf8;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-accent: #2d7d6e;
  --color-surface: #e8f0ee;

  --font-heading: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

h1,
h2,
h3 {
  font-family: var(--font-heading);
  line-height: 1.2;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  z-index: 100;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-4);
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    padding: var(--space-3);
    gap: var(--space-2);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  }

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

  .nav-toggle {
    display: block;
  }
}

/* Hero */
.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-6) var(--space-5);
  max-width: 720px;
}

.eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.hero-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin-bottom: var(--space-4);
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
}

.btn {
  padding: var(--space-2) var(--space-4);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid rgba(0, 0, 0, 0.15);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.about {
  padding: var(--space-6) var(--space-5);
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.section-heading {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--space-3);
}

.about-text {
  color: var(--color-text-secondary);
  margin-bottom: 0 auto var(--space-3);
  max-width: 55ch;
  text-align: left;
}

.about-facts {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
  margin: 0 auto;
  max-width: 55ch;
  text-align: left;
}

.about-facts strong {
  color: var(--color-text);
}

.contact {
  padding: var(--space-6) var(--space-5);
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.contact-desc {
  color: var(--color-text-secondary);
  max-width: 50ch;
  margin: 0 auto var(--space-5);
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1.5px solid rgba(0, 0, 0, 0.1);
  border-radius: 16px;
  color: var(--color-text);
  transition:
    transform 0.15s ease,
    border-color 0.15s ease;
}

.contact-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.contact-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  color: var(--color-accent);
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.9rem;
}

.contact-label {
  font-weight: 600;
}

.contact-value {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.projects {
  padding: var(--space-6) var(--space-5);
  max-width: 1100px;
  margin: 0 auto;
}

.projects .section-heading {
  text-align: center;
  margin-bottom: var(--space-5);
}

.project-grid {
  display: grip;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
}

.project-card {
  background: #fff;
  border-radius: 16px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.project-info {
  padding: var(--space-3);
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-1);
}

.project-desc {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-3);
}

.tag {
  background: var(--color-surface);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 600;
}

.resume {
  padding: var(--space-6) var(--space-5);
  max-width: 800px;
  margin: 0 auto;
}

.resume .section-heading {
  text-align: center;
}

.timeline {
  position: relative;
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-surface);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-5);
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-4) - 6px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
}

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

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.timeline-title {
  font-size: 1.2rem;
  margin-top: var(--space-1);
}

.timeline-org {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: var(--space-1);
}

.timeline-desc {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.timeline-group-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  margin-top: var(--space-2);
}

.timeline-group-label:first-child {
  margin-top: 0;
}

.skills {
  padding: var(--space-6) var(--space-5);
  max-width: 1100px;
  margin: 0 auto;
  background: var(--color-surface);
  border-radius: 24px;
}

.skills .section-heading {
  text-align: center;
  margin-bottom: var(--space-5);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

.skill-category {
  background: #fff;
  padding: var(--space-3);
  border-radius: 12px;
}

.skill-category-title {
  font-size: 1.1rem;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 2px solid var(--color-surface);
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.skill-list li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-list li::before {
  content: "◆";
  font-size: 0.55em;
  color: var(--color-accent);
  flex-shrink: 0;
}

section,
header {
  scroll-margin-top: 90px;
}

.footer {
  text-align: center;
  padding: var(--space-4);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-links a {
  position: relative;
  padding-bottom: 6px;
}

.nav-links a.active {
  color: var(--color-accent);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}

.back-to-top {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s;
  z-index: 200;
}

.back-to-top::before {
  content: "";
  width: 10px;
  height: 10px;
  border-top: 2.5px solid #fff;
  border-right: 2.5px solid #fff;
  transform: rotate(-45deg) translate(-1px, 1px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
}