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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.10);
  --transition: 0.25s ease;
  --max-w: 1100px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* ===========================
   UTILITIES
=========================== */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

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

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
  margin-top: 0.5rem;
}

/* ===========================
   BUTTONS
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: transparent;
}

.btn-ghost:hover {
  background: rgba(37, 99, 235, 0.06);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
  padding: 0.5rem 1.1rem;
  font-size: 0.875rem;
}

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

/* ===========================
   HEADER / NAV
=========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===========================
   HERO
=========================== */
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  padding: 4rem 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
}

.hero-eyebrow {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.photo-frame {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow-md);
  background: var(--color-bg-alt);
  flex-shrink: 0;
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.photo-placeholder::after {
  content: 'JT';
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-accent);
}

/* ===========================
   ABOUT
=========================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  font-size: 1.02rem;
}

.about-text p strong {
  color: var(--color-text);
  font-weight: 600;
}

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.info-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: var(--shadow);
}

.info-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.info-card-value {
  font-size: 0.9rem;
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.5;
}

/* ===========================
   SKILLS
=========================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-group {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.skill-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.skill-list li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
}

.skill-list li:last-child {
  border-bottom: none;
}

/* ===========================
   TIMELINE / EXPERIENCE
=========================== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-content {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.timeline-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.timeline-company {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.08);
  padding: 0.15rem 0.6rem;
  border-radius: 99px;
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.timeline-bullets {
  list-style: disc;
  padding-left: 1.25rem;
}

.timeline-bullets li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
  line-height: 1.6;
}

/* ===========================
   PROJECTS
=========================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.projects-status {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  padding: 2rem 0;
}

.project-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.project-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

.project-course {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 99px;
  padding: 0.15rem 0.55rem;
  white-space: nowrap;
  align-self: center;
}

.project-link {
  color: var(--color-text-muted);
  transition: color var(--transition);
  flex-shrink: 0;
  margin-top: 2px;
}

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

.project-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
}

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

.project-tags span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.08);
  border-radius: 99px;
  padding: 0.2rem 0.65rem;
}

/* ===========================
   CONTACT
=========================== */
.contact-inner {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.contact-sub {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.social-links {
  display: flex;
  gap: 1.25rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(37, 99, 235, 0.06);
  transform: translateY(-2px);
}

/* ===========================
   FOOTER
=========================== */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  text-align: center;
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ===========================
   ANIMATIONS
=========================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.7s ease forwards;
}

.fade-delay {
  animation-delay: 0.2s;
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .hero-actions {
    justify-content: center;
  }

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

  .photo-frame {
    width: 200px;
    height: 200px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem;
    gap: 1rem;
    box-shadow: var(--shadow-md);
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: relative;
  }

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

  .timeline {
    padding-left: 1.5rem;
  }

  .section {
    padding: 3.5rem 0;
  }
}