/* ==============================
   DESIGN TOKENS
   ============================== */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-accent: #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-accent-light: #eff6ff;
  --color-border: #e2e8f0;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

  --size-max: 1100px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.04);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);

  --transition: 150ms ease;
}

/* ==============================
   RESET
   ============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

/* ==============================
   UTILITIES
   ============================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--size-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 96px;
}

/* ==============================
   SECTION HEADER
   ============================== */
.section-header {
  margin-bottom: 56px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.2;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background-color: var(--color-accent);
  margin-top: 12px;
  border-radius: 2px;
}

.section-subtitle {
  margin-top: 16px;
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 600px;
  line-height: 1.6;
}

/* ==============================
   TAGS
   ============================== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: 100px;
  letter-spacing: 0.01em;
}

/* ==============================
   BUTTONS
   ============================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap;
  line-height: 1;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  box-shadow: 0 4px 12px rgb(37 99 235 / 0.3);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==============================
   HEADER / NAV
   ============================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgb(255 255 255 / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-header--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  transition: background-color var(--transition);
}

.logo:hover {
  background-color: var(--color-accent-dark);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 6px 14px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
}

.nav-link:hover,
.nav-link--active {
  color: var(--color-text);
  background-color: var(--color-bg-alt);
}

.nav-link--cta {
  margin-left: 8px;
  padding: 8px 18px;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav-link--cta:hover {
  background-color: var(--color-accent-dark);
  color: #ffffff;
}

.nav-link--cta.nav-link--active {
  background-color: var(--color-accent-dark);
  color: #ffffff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.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);
}

/* ==============================
   HERO
   ============================== */
.hero {
  padding-block: 120px 80px;
  min-height: calc(100svh - 64px);
  display: flex;
  align-items: center;
  background-color: var(--color-bg);
  position: relative;
}

.hero-content {
  max-width: 680px;
}

.hero-eyebrow {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-name {
  font-size: clamp(2.75rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-text);
}

.hero-headline {
  font-size: clamp(1.25rem, 3vw, 1.625rem);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: -0.01em;
  margin-top: 12px;
  line-height: 1.3;
}

.hero-tagline {
  margin-top: 20px;
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 520px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 36px;
  padding-top: 36px;
  border-top: 1px solid var(--color-border);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.social-link:hover {
  color: var(--color-accent);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  opacity: 0.6;
  animation: hero-bounce 2s ease infinite;
}

@keyframes hero-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ==============================
   EXPERIENCE TIMELINE
   ============================== */
.experience {
  background-color: var(--color-bg-alt);
}

.timeline {
  display: flex;
  flex-direction: column;
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent) 0%, var(--color-border) 100%);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: 28px;
}

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

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-border);
  border: 3px solid var(--color-bg-alt);
  z-index: 1;
  transition: background-color var(--transition);
}

.timeline-item--current .timeline-marker {
  background-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgb(37 99 235 / 0.15);
}

.timeline-body {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.timeline-body:hover {
  border-color: rgb(37 99 235 / 0.3);
  box-shadow: var(--shadow-md);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.timeline-company {
  margin-top: 3px;
  font-size: 0.9375rem;
  color: var(--color-accent);
  font-weight: 500;
}

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

.timeline-date {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding: 4px 12px;
  background-color: var(--color-bg-alt);
  border-radius: 100px;
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.timeline-highlights {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-highlights li {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.timeline-highlights li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
  opacity: 0.5;
}

/* ==============================
   PROJECTS
   ============================== */
.projects {
  background-color: var(--color-bg);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 460px), 1fr));
  gap: 24px;
}

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

.project-card:hover {
  border-color: rgb(37 99 235 / 0.35);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.project-card__body {
  flex: 1;
  padding: 28px;
}

.project-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.project-card__description {
  margin-top: 10px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.project-card__footer {
  padding: 16px 28px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 16px;
  background-color: var(--color-bg-alt);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}

.project-link:hover {
  color: var(--color-accent);
}

.project-link--live {
  color: var(--color-accent);
}

.projects-more {
  margin-top: 48px;
  text-align: center;
}

/* ==============================
   CONTACT
   ============================== */
.contact {
  background-color: var(--color-bg-alt);
}

.contact-inner {
  max-width: 640px;
  margin-inline: auto;
}

.contact-inner .section-header {
  text-align: center;
}

.contact-inner .section-title::after {
  margin-inline: auto;
}

.contact-linkedin {
  display: flex;
  justify-content: center;
  margin-top: 32px;
}

.contact-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-block: 32px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.contact-divider::before,
.contact-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-input {
  width: 100%;
  padding: 11px 14px;
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
}

.form-input::placeholder {
  color: #94a3b8;
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.12);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
}

.contact-form .btn {
  align-self: flex-start;
}

/* ==============================
   FOOTER
   ============================== */
.site-footer {
  padding-block: 32px;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

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

.footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

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

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--color-accent);
}

/* ==============================
   RESPONSIVE — TABLET
   ============================== */
@media (max-width: 768px) {
  .section {
    padding-block: 64px;
  }

  .hero {
    padding-block: 72px 56px;
    min-height: calc(100svh - 64px);
  }

  .hero-scroll {
    display: none;
  }

  /* Mobile nav */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    z-index: 99;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 8px;
    box-shadow: var(--shadow-md);
  }

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

  .nav-list-item {
    display: flex;
  }

  .nav-link {
    padding: 10px 14px;
  }

  .nav-link--cta {
    margin-left: 0;
    text-align: center;
    justify-content: center;
    margin-top: 4px;
  }

  /* Timeline */
  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  /* Contact form */
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* ==============================
   RESPONSIVE — MOBILE
   ============================== */
@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
    width: 100%;
  }

  .hero-social {
    gap: 20px;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-marker {
    left: -24px;
  }

  .timeline-body {
    padding: 20px;
  }

  .project-card__body {
    padding: 22px;
  }

  .project-card__footer {
    padding: 14px 22px;
  }

  .contact-form .btn {
    align-self: stretch;
    justify-content: center;
  }
}