:root {
  --bg: #0e1216;
  --surface: #161b22;
  --surface-soft: #1f252e;
  --text: #f5f7fb;
  --muted: #9ca3af;
  --primary: #6c63ff;
  --primary-soft: rgba(108, 99, 255, 0.16);
  --accent: #52d1ff;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.18);
}

[data-theme="light"] {
  --bg: #f3f4f8;
  --surface: #ffffff;
  --surface-soft: #f9fafc;
  --text: #111827;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-soft: rgba(79, 70, 229, 0.12);
  --accent: #0ea5e9;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: radial-gradient(circle at top, rgba(79, 70, 229, 0.08), transparent 30%), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

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

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

button {
  font: inherit;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(14, 18, 22, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.nav__link {
  color: var(--muted);
  transition: color 0.25s ease;
}

.nav__link:hover,
.nav__link.active {
  color: var(--primary);
}

.theme-toggle,
.mobile-toggle {
  border: none;
  background: none;
  color: var(--text);
  cursor: pointer;
  font-size: 1.1rem;
}

.mobile-toggle {
  display: none;
}

.section {
  padding: 5rem 0;
}

.section__header {
  text-align: center;
  margin-bottom: 2rem;
}

.section__tag {
  display: inline-flex;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.section h2 {
  font-size: clamp(2rem, 2.2vw, 2.75rem);
  margin: 0;
}

.hero {
  position: relative;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
}

.hero__text {
  max-width: 640px;
}

.eyebrow {
  display: inline-block;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(3rem, 5vw, 4.25rem);
  line-height: 0.95;
  margin: 0;
}

.hero__subtitle {
  margin: 1.5rem 0 2rem;
  max-width: 58ch;
  color: var(--muted);
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.85rem;
  padding: 0.95rem 1.6rem;
  border: 1px solid transparent;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}

.button:hover {
  transform: translateY(-2px);
}

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

.button.secondary {
  background: transparent;
  border-color: rgba(255,255,255,0.15);
  color: var(--text);
}

.social-links {
  display: inline-flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  color: var(--text);
  font-weight: 600;
  transition: background 0.25s ease;
}

.social-links a .icon,
.contact-icons a .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  font-size: 1rem;
}

.icon.linkedin {
  width: 1.4rem;
  height: 1.4rem;
  background: #0A66C2;
  color: #ffffff;
  border-radius: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
}

.icon.github {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 0.35rem;
  background: rgba(255,255,255,0.08);
}

.icon.email {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 0.35rem;
  background: rgba(255,255,255,0.08);
}

.contact-icons {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.2rem;
}

.contact-icons a {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255,255,255,0.05);
  padding: 1rem 1.1rem;
  border-radius: 1rem;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.08);
  transition: background 0.25s ease, transform 0.2s ease;
}

.contact-icons a:hover {
  background: rgba(255,255,255,0.10);
  transform: translateY(-1px);
}

.social-links a:hover {
  background: var(--surface-soft);
}

.hero__card {
  background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  min-height: 360px;
  display: grid;
  gap: 1.5rem;
}

.card-glow {
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.14), rgba(14, 18, 22, 0.95));
}

.hero__image-placeholder {
  width: 100%;
  height: 260px;
  border-radius: 1.25rem;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.24), rgba(14,18,22,0.95));
  display: grid;
  place-items: center;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero__stats {
  display: grid;
  gap: 1rem;
}

.hero__stats div {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem;
  border-radius: 1rem;
  background: rgba(255,255,255,0.05);
}

.hero__stats h3 {
  margin: 0;
  font-size: 1.05rem;
}

.hero__stats p {
  margin: 0;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.06);
}

.about__grid,
.skills__grid,
.education__grid,
.contact__grid {
  display: grid;
  gap: 1.75rem;
}

.about__grid {
  grid-template-columns: 1.2fr 0.8fr;
}

.about__bio h3,
.about__skills h3,
.skill-card h3,
.education__card h3,
.cert-card h3,
.timeline__item h3,
.contact__info h3 {
  margin-top: 0;
}

.about__details {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.about__details span {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}

.about__details p {
  margin: 0.35rem 0 0;
}

.about__skills ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.9rem;
}

.about__skills li::before {
  content: "•";
  color: var(--primary);
  margin-right: 0.5rem;
}

.skills__grid {
  grid-template-columns: repeat(3, minmax(220px, 1fr));
}

.skill-card p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.projects__list {
  display: grid;
  gap: 1.75rem;
}

.project-card {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1.5rem;
  align-items: stretch;
}

.project-card .project__content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.project-card h3 {
  margin: 0;
}

.project-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.project__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.project__tech li {
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary);
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

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

.project__links a {
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 0.8rem 1rem;
  border-radius: 0.95rem;
}

.project__media {
  border-radius: 1.35rem;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.12), rgba(14, 18, 22, 0.95));
  display: grid;
  place-items: center;
  min-height: 220px;
  color: var(--text);
  font-size: 1.1rem;
  text-align: center;
  padding: 1rem;
}

.timeline {
  display: grid;
  gap: 1.5rem;
}

.timeline__item {
  border-left: 4px solid var(--primary);
  padding-left: 1.5rem;
}

.timeline__date {
  display: inline-flex;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--primary);
  font-size: 0.9rem;
  margin-bottom: 0.9rem;
}

.certs__grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
}

.cert-card p {
  color: var(--muted);
  line-height: 1.65;
}

.education__grid {
  grid-template-columns: repeat(2, minmax(260px, 1fr));
}

.education__card span {
  display: block;
  margin-top: 0.75rem;
  color: var(--muted);
  line-height: 1.7;
}

.contact__grid {
  grid-template-columns: 1fr 1.2fr;
}

.contact__form {
  display: grid;
  gap: 1rem;
}

.contact__form label {
  font-weight: 600;
}

.contact__form input,
.contact__form textarea {
  border-radius: 1rem;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  padding: 1rem 1.1rem;
  outline: none;
}

.contact__form input:focus,
.contact__form textarea:focus {
  border-color: rgba(79, 70, 229, 0.45);
}

.form__note {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

.footer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 2rem 0;
}

.footer__content {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.footer__links {
  display: flex;
  gap: 1rem;
}

.footer__links a {
  color: var(--muted);
}

@media (max-width: 980px) {
  .hero__grid,
  .about__grid,
  .skills__grid,
  .education__grid,
  .contact__grid,
  .certs__grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    grid-template-columns: 1fr;
  }

  .hero__card {
    min-height: auto;
  }
}

@media (max-width: 760px) {
  .header__content {
    align-items: flex-start;
  }

  .nav {
    position: fixed;
    inset: 72px 0 0 0;
    padding: 1.5rem;
    flex-direction: column;
    background: rgba(14, 18, 22, 0.98);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    pointer-events: none;
    gap: 1.2rem;
    z-index: 15;
  }

  .nav.open {
    transform: translateY(0);
    pointer-events: auto;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .theme-toggle {
    display: inline-flex;
  }

  .header__content {
    flex-wrap: wrap;
  }

  .hero {
    padding-top: 4rem;
  }
}

@media (max-width: 520px) {
  .hero h1 {
    font-size: 2.8rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__stats {
    gap: 0.8rem;
  }

  .project__links a {
    flex: 1 1 100%;
    text-align: center;
  }
}