/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-surface: #f6f7fb;
  --color-text: #1b1f27;
  --color-text-muted: #5b6270;
  --color-border: #e3e5ea;
  --color-primary: #3357e0;
  --color-primary-hover: #2645c0;
  --color-primary-soft: #eaeeff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(20, 20, 40, 0.06), 0 8px 24px rgba(20, 20, 40, 0.06);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 5rem;

  --max-width: 1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12141a;
    --color-surface: #191c24;
    --color-text: #eef0f4;
    --color-text-muted: #a3a8b5;
    --color-border: #2a2e38;
    --color-primary: #7d92ff;
    --color-primary-hover: #93a4ff;
    --color-primary-soft: #232a4a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* ---------- Reset / base ---------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

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

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

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

ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  margin: 0 0 var(--space-2);
}

p {
  margin: 0 0 var(--space-2);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.nav {
  display: flex;
  gap: var(--space-4);
}

.nav-link {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-6) 0;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.hero-text {
  flex: 1.2;
}

.eyebrow {
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin-bottom: var(--space-1);
}

.hero-text h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
}

.tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 500;
  color: var(--color-text-muted);
}

.hero-pitch {
  max-width: 46ch;
  color: var(--color-text-muted);
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  margin: var(--space-3) 0;
  flex-wrap: wrap;
}

.social-links {
  display: flex;
  gap: var(--space-3);
}

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

.social-links a:hover {
  color: var(--color-primary);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.hero-image img {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow);
}

/* ---------- Sections ---------- */
.section {
  padding: var(--space-6) 0;
}

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

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: var(--space-4);
}

.section-intro {
  color: var(--color-text-muted);
  max-width: 60ch;
}

.subsection-title {
  font-size: 1.2rem;
  margin-top: var(--space-5);
  margin-bottom: var(--space-3);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-5);
  align-items: start;
}

.about-text p {
  color: var(--color-text-muted);
}

.quick-facts {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quick-facts li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.fact-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* ---------- Resume ---------- */
.resume-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.resume-header .section-title {
  margin-bottom: 0;
}

.timeline {
  border-left: 2px solid var(--color-border);
  padding-left: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.timeline-item {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-4) - 6px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg);
}

.timeline-content h4 {
  font-size: 1.05rem;
}

.timeline-company {
  font-weight: 400;
  color: var(--color-text-muted);
}

.timeline-dates {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.timeline-content ul {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.timeline-content li {
  position: relative;
  padding-left: 1rem;
  color: var(--color-text-muted);
}

.timeline-content li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-text-muted);
}

.education-item h4 {
  font-size: 1.05rem;
}

.additional-experience {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.additional-experience li {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.additional-experience li:last-child {
  border-bottom: none;
}

.skills-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
}

.skills-group-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.project-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.project-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-surface);
}

.project-card-body {
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
}

.project-card h3 {
  font-size: 1.1rem;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.25rem 0;
}

.project-tags .chip {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
}

.project-links {
  display: flex;
  gap: var(--space-2);
  margin-top: 0.5rem;
}

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

/* ---------- Contact ---------- */
.contact-inner {
  text-align: center;
}

.contact-inner .section-intro {
  margin-left: auto;
  margin-right: auto;
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-pitch {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions,
  .social-links {
    justify-content: center;
  }

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

  .nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .nav.is-open {
    max-height: 300px;
  }

  .nav-link {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
    border-left: 2px solid transparent;
  }

  .nav-link.active {
    border-left-color: var(--color-primary);
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 480px) {
  .hero-image img {
    width: 180px;
    height: 180px;
  }

  .resume-header {
    flex-direction: column;
    align-items: flex-start;
  }
}