:root {
  --bg-color: #050816;
  --bg-alt-color: #0b1020;
  --card-bg: #111827;
  --accent-color: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --text-color: #e5e7eb;
  --muted-text: #9ca3af;
  --border-color: #1f2937;
  --error-color: #ef4444;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.8);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition-fast: 0.18s ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #020617 0, #020617 40%, #020617 100%),
    radial-gradient(circle at 0 150%, #22d3ee11 0, transparent 50%),
    radial-gradient(circle at 100% 150%, #6366f111 0, transparent 50%);
  color: var(--text-color);
  min-height: 100vh;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("https://images.pexels.com/photos/669619/pexels-photo-669619.jpeg?auto=compress&cs=tinysrgb&w=1200");
  background-size: cover;
  background-position: center;
  opacity: 0.09;
  pointer-events: none;
  z-index: -1;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
}
a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.65));
  border-bottom: 1px solid rgba(31, 41, 55, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0.2rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.22rem 0.75rem;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.3) 0, transparent 55%),
    rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.7);
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  color: #0b1120;
  font-weight: 700;
  font-size: 0.9rem;
}

.logo-text {
  font-weight: 600;
  font-size: 0.96rem;
  letter-spacing: 0.03em;
}

.nav {
  position: relative;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
  padding: 0.35rem 0.85rem;
  margin: 0;
  border-radius: var(--radius-pill);
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(31, 41, 55, 0.9);
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.75);
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--muted-text);
  position: relative;
  padding-bottom: 0.1rem;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #38bdf8, #6366f1);
  transition: width var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: #e5e7eb;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px 0;
  border-radius: 999px;
  background-color: #e5e7eb;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

.hero {
  padding: 4.5rem 0 3.75rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(0, 1.7fr);
  gap: 2.25rem;
  align-items: center;
}

.hero-greeting {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: 2.8rem;
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
}

.hero-role {
  font-size: 1.05rem;
  color: var(--muted-text);
  margin: 0 0 0.8rem;
}

.hero-summary {
  margin: 0 0 1.4rem;
  color: var(--muted-text);
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.primary-btn {
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  color: #0b1120;
  box-shadow: 0 15px 35px rgba(56, 189, 248, 0.32);
}

.ghost-btn {
  background: rgba(15, 23, 42, 0.85);
  color: var(--text-color);
  border-color: rgba(148, 163, 184, 0.45);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.95);
}

.primary-btn:hover {
  box-shadow: 0 18px 38px rgba(56, 189, 248, 0.45);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.78rem;
  padding: 0.18rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: #e0f2fe;
}

.hero-aside {
  justify-self: center;
}

.hero-photo-wrapper {
  width: 240px;
  height: 240px;
  border-radius: 28px;
  background: radial-gradient(circle at 20% 0, rgba(56, 189, 248, 0.35) 0, transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(129, 140, 248, 0.38) 0, transparent 55%),
    #020617;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.45);
  overflow: hidden;
}

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

.hero-photo-caption {
  margin-top: 0.55rem;
  font-size: 0.82rem;
  color: var(--muted-text);
  text-align: center;
}

.section {
  padding: 3.25rem 0;
}

.alt-section {
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.9) 0, rgba(15, 23, 42, 1) 55%),
    linear-gradient(to bottom, #020617, #020617);
}

.section-title {
  font-size: 1.7rem;
  margin: 0 0 0.7rem;
}

.section-intro {
  margin: 0 0 2rem;
  color: var(--muted-text);
  max-width: 34rem;
}

.subheading {
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.2fr);
  gap: 2.25rem;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.chip {
  font-size: 0.8rem;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.75rem;
}

.card {
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.18) 0, transparent 55%),
    #020617f2;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(31, 41, 55, 0.95);
  padding: 1.2rem 1.1rem 1.15rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.85);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card-image {
  border-radius: 14px;
  overflow: hidden;
  margin: -0.2rem -0.1rem 0.6rem;
  border: 1px solid rgba(15, 23, 42, 0.9);
}

.card-image img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  display: block;
}

.card-title {
  font-size: 1.02rem;
  margin: 0;
}

.card-meta {
  margin: 0;
  font-size: 0.8rem;
  color: #a5b4fc;
}

.card-body {
  margin: 0.2rem 0 0.6rem;
  font-size: 0.88rem;
  color: var(--muted-text);
}

.card-links {
  display: flex;
  gap: 0.9rem;
  margin-top: auto;
  font-size: 0.85rem;
}

.card-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--accent-color);
}

.card-links a::after {
  content: "↗";
  font-size: 0.8em;
}

.cert-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
  gap: 2.25rem;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid rgba(55, 65, 81, 0.9);
}

.timeline li {
  padding: 0 0 1.1rem 1.1rem;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -0.38rem;
  top: 0.2rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
}

.timeline-title {
  font-size: 0.96rem;
}

.timeline-subtitle {
  font-size: 0.8rem;
  color: #a5b4fc;
  margin-bottom: 0.25rem;
}

.timeline-body {
  font-size: 0.86rem;
  color: var(--muted-text);
  margin: 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.3fr);
  gap: 2.4rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.contact-list span {
  font-size: 0.8rem;
  color: var(--muted-text);
}

.contact-list a {
  font-size: 0.9rem;
  color: var(--accent-color);
  word-break: break-all;
}

.contact-form {
  background: rgba(15, 23, 42, 0.95);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(31, 41, 55, 0.98);
  padding: 1.1rem 1.1rem 1.2rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.92);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.form-row label {
  font-size: 0.82rem;
  color: var(--muted-text);
}

.form-row input,
.form-row textarea {
  border-radius: 10px;
  border: 1px solid rgba(55, 65, 81, 0.9);
  background: #020617;
  color: var(--text-color);
  padding: 0.5rem 0.7rem;
  font-size: 0.88rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.form-row input:focus,
.form-row textarea:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4);
  background: #020617;
}

.site-footer {
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  padding: 1.1rem 0 1.6rem;
  background: radial-gradient(circle at bottom, rgba(15, 23, 42, 0.9), #020617);
}

.footer-inner {
  display: flex;
  justify-content: center;
  font-size: 0.78rem;
  color: var(--muted-text);
}

section.section,
section.hero {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}

section.section.section-visible,
section.hero.section-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 880px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-aside {
    order: -1;
    margin-bottom: 1.1rem;
  }

  .cards-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .about-grid,
  .cert-grid,
  .contact-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .section-intro {
    max-width: none;
  }
}

@media (max-width: 720px) {
  .header-inner {
    padding-inline: 0.4rem;
  }

  .nav-links {
    position: absolute;
    top: 115%;
    right: 0.35rem;
    flex-direction: column;
    align-items: flex-start;
    width: 190px;
    padding: 0.75rem 0.9rem;
    background: rgba(15, 23, 42, 0.98);
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.16s ease-out, transform 0.16s ease-out;
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: 0.5rem;
  }

  .nav-links a {
    font-size: 0.9rem;
  }

  .hero {
    padding-top: 3.3rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .cards-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 0 2.6rem;
  }

  .hero-title {
    font-size: 1.9rem;
  }

  .hero-summary {
    font-size: 0.92rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .card-image img {
    height: 130px;
  }
}