/* ── Variables ── */
:root {
  --bg:           #FFFFFF;
  --bg-alt:       #F8FAFC;
  --accent:       #0284C7;
  --accent-light: #E0F2FE;
  --accent-dark:  #0369A1;
  --text:         #1E293B;
  --text-muted:   #64748B;
  --border:       #E2E8F0;
  --card:         #FFFFFF;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:    0 10px 30px rgba(0,0,0,.12);
  --radius:       10px;
  --nav-h:        64px;
  --font:         'Inter', system-ui, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; font-family: var(--font); border: none; background: none; }

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section {
  padding-block: 6rem;
}
.section--alt {
  background: var(--bg-alt);
}
.section__title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: .5rem;
}
.section__title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: .5rem;
}
.section__sub {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .7rem 1.5rem;
  border-radius: 6px;
  font-size: .95rem;
  font-weight: 500;
  transition: all .2s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--outline {
  border: 1.5px solid var(--accent);
  color: var(--accent);
}
.btn--outline:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn--sm { padding: .45rem 1rem; font-size: .85rem; }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: background .3s, box-shadow .3s;
}
.nav.scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}
.nav__inner {
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.3px;
}
.nav__logo span { color: var(--accent); }
.nav__links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
}
.nav__links a {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color .2s;
}
.nav__links a:hover { color: var(--accent); }
.nav__cta { margin-left: 1rem; }
.nav__burger { display: none; color: var(--text); margin-left: auto; }

/* Mobile drawer */
.nav__drawer {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 1rem 1.5rem 1.5rem;
}
.nav__drawer.open { display: block; }
.nav__drawer ul { display: flex; flex-direction: column; gap: .75rem; }
.nav__drawer a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  display: block;
  padding: .3rem 0;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-h);
  background: linear-gradient(160deg, #fff 60%, #F0F9FF 100%);
  position: relative;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4rem;
  padding-block: 4rem;
}
.hero__greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: .5rem;
}
.hero__name {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.5px;
  margin-bottom: .75rem;
}
.hero__role {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 1.25rem;
  min-height: 1.8em;
}
.typewriter { color: var(--accent); font-weight: 500; }
.cursor {
  color: var(--accent);
  animation: blink .7s step-end infinite;
}
@keyframes blink { 50% { opacity: 0 } }

.hero__bio {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2rem; }
.hero__social {
  display: flex;
  gap: 1rem;
}
.hero__social a {
  color: var(--text-muted);
  transition: color .2s, transform .2s;
}
.hero__social a:hover { color: var(--accent); transform: translateY(-2px); }

.hero__avatar-wrap {
  position: relative;
  flex-shrink: 0;
}
.avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg);
}
.avatar svg { width: 100%; height: 100%; }
.avatar__ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px dashed var(--accent);
  opacity: .35;
  animation: spin 20s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0) } 50% { transform: translateX(-50%) translateY(6px) } }

/* ── About ── */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about__text p { margin-bottom: 1rem; color: var(--text-muted); line-height: 1.75; }
.about__text p strong { color: var(--text); }
.about__links { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-card__number { font-size: 2rem; font-weight: 700; color: var(--accent); line-height: 1; }
.stat-card__label { font-size: .8rem; color: var(--text-muted); font-weight: 500; }

/* ── Skills ── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.skill-group {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.skill-group__title {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: .75rem;
}
.tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tag {
  font-size: .78rem;
  font-weight: 500;
  padding: .25rem .7rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  transition: border-color .2s, color .2s;
}
.tag:hover { border-color: var(--accent); color: var(--accent); }
.tag--accent { background: var(--accent-light); border-color: #BAE6FD; color: var(--accent-dark); }

/* ── Projects ── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2rem;
}
.filter-btn {
  padding: .45rem 1.1rem;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 500;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  background: var(--bg);
  transition: all .2s;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s, opacity .3s;
}
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.project-card.hidden { display: none; }

.project-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .5rem;
}
.project-card__title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}
.badge {
  font-size: .7rem;
  font-weight: 600;
  padding: .2rem .6rem;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}
.badge--green { background: #DCFCE7; color: #15803D; }
.badge--blue  { background: #DBEAFE; color: #1D4ED8; }
.badge--amber { background: #FEF9C3; color: #A16207; }

.project-card__desc {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}
.project-card__links {
  display: flex;
  gap: .6rem;
  margin-top: auto;
}
.project-card__links a {
  font-size: .8rem;
  font-weight: 500;
  padding: .35rem .8rem;
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: .3rem;
  transition: all .2s;
}
.project-card__links a:hover { border-color: var(--accent); color: var(--accent); }
.project-card__links a.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.project-card__links a.primary:hover { background: var(--accent-dark); }

/* ── Timeline / Experience ── */
.timeline { position: relative; padding-left: 1.5rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: .5rem; bottom: 0;
  width: 2px;
  background: var(--border);
  border-radius: 1px;
}
.timeline__item { position: relative; margin-bottom: 2rem; }
.timeline__dot {
  position: absolute;
  left: -1.84rem;
  top: .4rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}
.timeline__card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.timeline__role { font-size: 1.05rem; font-weight: 600; }
.timeline__company { font-size: .875rem; color: var(--accent); font-weight: 500; margin-top: .2rem; }
.timeline__date { font-size: .8rem; color: var(--text-muted); white-space: nowrap; background: var(--bg-alt); padding: .25rem .7rem; border-radius: 999px; border: 1px solid var(--border); }
.timeline__list { padding-left: 1rem; display: flex; flex-direction: column; gap: .4rem; }
.timeline__list li { font-size: .875rem; color: var(--text-muted); line-height: 1.6; list-style: disc; }

/* ── Education ── */
.edu__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}
.edu-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}
.edu-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.edu-card__icon { font-size: 1.5rem; flex-shrink: 0; margin-top: .1rem; }
.edu-card__degree { font-size: .95rem; font-weight: 600; margin-bottom: .25rem; line-height: 1.35; }
.edu-card__school { font-size: .825rem; color: var(--accent); font-weight: 500; }
.edu-card__year { font-size: .775rem; color: var(--text-muted); margin-top: .25rem; }

/* ── Contact ── */
.contact__wrap { text-align: center; }
.contact__links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
  text-align: left;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  color: var(--text);
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); color: var(--accent); }
.contact-card svg { flex-shrink: 0; color: var(--accent); }
.contact-card__label { display: block; font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }
.contact-card__value { display: block; font-size: .875rem; font-weight: 500; margin-top: .1rem; }
.contact__location {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .875rem;
  color: var(--text-muted);
}

/* ── Footer ── */
.footer {
  background: var(--text);
  color: rgba(255,255,255,.6);
  padding-block: 1.75rem;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: .85rem;
}
.footer__links { display: flex; gap: 1.5rem; }
.footer__links a { color: rgba(255,255,255,.6); transition: color .2s; }
.footer__links a:hover { color: #fff; }

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .nav.scrolled { background: rgba(255,255,255,.98); }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
    padding-block: 3rem;
  }
  .hero__bio { margin-inline: auto; }
  .hero__actions, .hero__social { justify-content: center; }
  .hero__avatar-wrap { order: -1; display: flex; justify-content: center; }
  .avatar { width: 160px; height: 160px; }

  .about__grid { grid-template-columns: 1fr; }
  .skills__grid { grid-template-columns: 1fr; }
  .projects__grid { grid-template-columns: 1fr; }
  .edu__grid { grid-template-columns: 1fr; }
  .contact__links { grid-template-columns: 1fr; }

  .timeline__header { flex-direction: column; }
  .footer__inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .section { padding-block: 4rem; }
  .hero__name { font-size: 2rem; }
  .about__stats { grid-template-columns: 1fr 1fr; }
}