:root {
  --bg: #f6f7fb;
  --bg-alt: #ffffff;
  --bg-elevated: #ffffff;
  --text: #111827;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-strong: #0f172a;
  --border-subtle: #e5e7eb;
  --danger: #dc2626;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.5rem;

  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.09);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;

  --container-width: 1120px;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
}

/* Global */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: radial-gradient(circle at top left, #e0edff 0, #f6f7fb 35%, #ffffff 75%);
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header & Nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(246, 247, 251, 0.96), rgba(246, 247, 251, 0.88));
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__logo-circle {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #93c5fd, #1d4ed8);
  color: #f9fafb;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
}

.nav__brand-text {
  display: flex;
  flex-direction: column;
}

.nav__name {
  font-weight: 600;
  font-size: 0.95rem;
}

.nav__role {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  font-size: 0.85rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  color: #4b5563;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.nav__link:hover {
  background: rgba(148, 163, 184, 0.16);
  color: var(--accent-strong);
  transform: translateY(-1px);
}

.nav__link--active {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.nav__link--cta {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #0f172a;
  color: #f9fafb;
}

.nav__link--cta:hover {
  background: #111827;
}

/* Mobile nav */

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.4rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: #e5e7eb;
}

.nav__bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #111827;
}

/* Sections */

.section {
  padding: var(--space-2xl) 0;
}

.section--alt {
  background: linear-gradient(to bottom, #f9fafb, #eef2ff);
}

.section__header {
  margin-bottom: var(--space-xl);
  text-align: left;
}

.section__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.9rem;
  letter-spacing: -0.02em;
}

.section__subtitle {
  margin: 0;
  max-width: 620px;
  color: var(--text-muted);
}

/* Hero */

.section--hero {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(0, 1.2fr);
  gap: var(--space-xl);
  align-items: center;
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.7rem;
  color: #6b7280;
  margin-bottom: var(--space-xs);
}

.hero__title {
  font-size: clamp(2.4rem, 3vw, 3.1rem);
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: 1rem;
  margin: 0 0 var(--space-sm);
  color: #4b5563;
}

.hero__summary {
  margin: 0 0 var(--space-md);
  color: var(--text-muted);
}

.hero__actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

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

.hero__visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: flex-start;
}

/* Hero profile avatar */

.hero__avatar-wrapper {
  text-align: center;
  width: 100%;
}

.hero__avatar {
  width: 140px;
  height: 140px;
  border-radius: 999px;
  padding: 3px;
  margin: 0 auto var(--space-xs);
  background: radial-gradient(circle at 30% 30%, #93c5fd, #1d4ed8);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.hero__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.hero__avatar-caption {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero__card {
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.14), #020617);
  color: #f9fafb;
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-soft);
}

.hero__card--accent {
  background: radial-gradient(circle at top left, rgba(16, 185, 129, 0.16), #0f172a);
}

.hero__card-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: rgba(209, 213, 219, 0.9);
  margin: 0 0 var(--space-xs);
}

.hero__card-metric {
  font-size: 1.7rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.hero__card-text {
  margin: 0;
  color: rgba(209, 213, 219, 0.9);
  font-size: 0.9rem;
}

/* Buttons & pills */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.btn--primary {
  background: #111827;
  color: #f9fafb;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.3);
}

.btn--primary:hover {
  background: #020617;
  transform: translateY(-1px);
}

.btn--ghost {
  background: rgba(148, 163, 184, 0.12);
  border-color: rgba(148, 163, 184, 0.6);
  color: #111827;
}

.btn--ghost:hover {
  background: rgba(148, 163, 184, 0.2);
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: rgba(15, 23, 42, 0.04);
  color: #374151;
}

.pill--outline {
  background: transparent;
  border: 1px solid rgba(148, 163, 184, 0.7);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* About */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(0, 1.2fr);
  gap: var(--space-xl);
  align-items: flex-start;
}

.about__bio p {
  margin: 0 0 var(--space-sm);
  color: var(--text-muted);
}

.about__timeline {
  margin-top: var(--space-md);
  border-left: 2px solid rgba(148, 163, 184, 0.5);
  padding-left: var(--space-md);
  display: grid;
  gap: var(--space-sm);
}

.about__timeline-item {
  position: relative;
}

.about__timeline-item::before {
  content: "";
  position: absolute;
  left: -1.075rem;
  top: 0.25rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #93c5fd, #1d4ed8);
}

.about__timeline-year {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: #6b7280;
}

.about__timeline-item p {
  margin: 0.15rem 0 0;
  color: #4b5563;
  font-size: 0.9rem;
}

.about__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.stat {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.stat__value {
  display: block;
  font-weight: 600;
  font-size: 1.3rem;
}

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

.about__skills-title {
  margin: 0 0 var(--space-sm);
}

.skills-group {
  margin-bottom: var(--space-sm);
}

.skills-group h4 {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #6b7280;
}

/* Cards, timeline */

.card {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.04);
  position: relative;
}

.card__title {
  margin: 0 0 0.25rem;
}

.card__meta {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card__summary {
  margin: var(--space-sm) 0;
  color: #4b5563;
  font-size: 0.9rem;
}

.card__extra {
  margin-top: var(--space-sm);
  display: none;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.card__list {
  padding-left: 1.1rem;
  margin: 0 0 var(--space-sm);
}

.card__list li {
  margin-bottom: 0.25rem;
}

.card__toggle {
  margin-top: var(--space-sm);
  border: none;
  background: transparent;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #4b5563;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.card--expanded .card__extra {
  display: block;
}

/* Timeline */

.timeline {
  display: grid;
  gap: var(--space-md);
}

.timeline__meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.timeline__role {
  font-weight: 600;
  color: #111827;
}

/* Projects */

.projects__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
}

.filter-btn {
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(248, 250, 252, 0.8);
  border-radius: 999px;
  font-size: 0.8rem;
  padding: 0.3rem 0.9rem;
  cursor: pointer;
  color: #374151;
}

.filter-btn--active {
  background: #111827;
  color: #f9fafb;
  border-color: #111827;
}

.projects__grid {
  display: grid;
  gap: var(--space-md);
}

.project__title {
  margin: 0 0 0.25rem;
}

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

.project__summary {
  margin: var(--space-sm) 0;
  color: #4b5563;
  font-size: 0.9rem;
}

/* Community / Volunteering */

.community {
  display: grid;
  gap: var(--space-md);
}

/* Certifications */

.certs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}

.cert__title {
  margin: 0 0 0.25rem;
}

.cert__issuer {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.cert__summary {
  margin: 0;
  font-size: 0.9rem;
  color: #4b5563;
}

/* Media */

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}

.media-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.media-card__thumb {
  height: 150px;
  border-radius: var(--radius-md);
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.23), #020617);
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.media-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-card__tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.media-card__summary {
  margin: 0;
  font-size: 0.9rem;
  color: #4b5563;
}

/* Lightbox */

.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 30;
}

.lightbox--visible {
  display: flex;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
}

.lightbox__content {
  position: relative;
  z-index: 1;
  max-width: 540px;
  width: 100%;
  margin: 0 var(--space-md);
  background: #020617;
  color: #e5e7eb;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.lightbox__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  border: none;
  background: rgba(15, 23, 42, 0.6);
  color: #e5e7eb;
  border-radius: 999px;
  width: 1.8rem;
  height: 1.8rem;
  cursor: pointer;
}

.lightbox__title {
  margin-top: 0;
}

.lightbox__meta {
  font-size: 0.85rem;
  color: #9ca3af;
}

.lightbox__image-wrapper {
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: radial-gradient(circle at top left, rgba(96, 165, 250, 0.4), rgba(15, 23, 42, 0.8));
}

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

.lightbox__note {
  font-size: 0.85rem;
  color: #d1d5db;
}

/* Contact */

.contact {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.2fr);
}

.contact__info p {
  margin: 0 0 var(--space-sm);
  color: var(--text-muted);
}

.contact__item {
  color: #4b5563;
}

.contact__socials {
  margin-top: var(--space-md);
}

.contact__social-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: #6b7280;
}

/* Form */

.contact__form {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-soft);
}

.form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.form__field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: var(--space-md);
}

.form__field label {
  font-size: 0.85rem;
  color: #374151;
}

input,
textarea {
  border-radius: 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.85);
  padding: 0.6rem 0.8rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  background: #f9fafb;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.45);
  background: #ffffff;
}

.form__error {
  font-size: 0.75rem;
  color: var(--danger);
  min-height: 1em;
}

.form__status {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: #4b5563;
}

/* Footer */

.site-footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid rgba(148, 163, 184, 0.35);
  background: #f9fafb;
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: #6b7280;
  text-align: center;
}

/* Animations & scroll observers */

.fade-in,
.slide-up,
.in-view-on-scroll {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */

@media (max-width: 860px) {
  .hero,
  .about,
  .contact {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__visual {
    order: -1;
  }

  .section {
    padding: var(--space-xl) 0;
  }
}

@media (max-width: 760px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: absolute;
    inset: calc(100% + 4px) var(--space-md) auto var(--space-md);
    background: rgba(249, 250, 251, 0.98);
    border-radius: var(--radius-md);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.2);
    padding: var(--space-sm);
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    transform-origin: top;
    transform: scaleY(0.8);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease, transform 0.18s ease;
  }

  .nav--open .nav__links {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    width: 100%;
  }

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

  .contact__form {
    padding: var(--space-md);
  }
}