:root {
  color-scheme: dark;
  --bg: #06070b;
  --bg-elevated: rgba(15, 18, 26, 0.8);
  --surface: rgba(18, 24, 34, 0.88);
  --surface-strong: rgba(23, 30, 43, 0.96);
  --border: rgba(106, 130, 163, 0.22);
  --border-strong: rgba(82, 198, 255, 0.4);
  --text: #eef3ff;
  --text-soft: #a8b5ce;
  --text-muted: #8290a9;
  --blue: #47a6ff;
  --green: #58ffa8;
  --blue-soft: rgba(71, 166, 255, 0.18);
  --green-soft: rgba(88, 255, 168, 0.16);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --container: min(1160px, calc(100vw - 2rem));
  --transition: 240ms ease;
}

/* Core reset and base layout */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(
      circle at top left,
      rgba(71, 166, 255, 0.18),
      transparent 28%
    ),
    radial-gradient(
      circle at top right,
      rgba(88, 255, 168, 0.12),
      transparent 26%
    ),
    linear-gradient(180deg, #030408 0%, #0a0d14 55%, #05070c 100%);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

body.is-loaded .loading-screen {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-shell {
  position: relative;
  isolation: isolate;
}

.loading-screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(3, 4, 8, 0.96);
  z-index: 20;
  transition:
    opacity 500ms ease,
    visibility 500ms ease;
}

.loading-mark {
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.loading-ring {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.08);
  border-top-color: var(--blue);
  box-shadow: 0 0 28px rgba(71, 166, 255, 0.22);
  animation: spin 1s linear infinite;
}

.loading-text {
  color: var(--text-soft);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  width: var(--container);
  margin: 0 auto;
  padding: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(18px);
  background: rgba(7, 9, 14, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.03);
  border-radius: 999px;
  z-index: -1;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.35rem 0.9rem;
}

.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: #04111e;
  font-weight: 800;
}

.brand-text {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem;
}

.nav-link {
  color: var(--text-soft);
  padding: 0.65rem 0.95rem;
  border-radius: 999px;
  transition:
    color var(--transition),
    background-color var(--transition),
    transform var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex-direction: column;
}

.menu-toggle span {
  width: 1rem;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform var(--transition);
}

/* Hero composition and layered visual depth */
main {
  width: var(--container);
  margin: 0 auto;
  padding-bottom: 5rem;
}

.section {
  padding: 5.5rem 0 0;
}

.hero {
  min-height: calc(100vh - 5rem);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.8fr);
  gap: 1.5rem;
  align-items: center;
  position: relative;
}

.hero-backdrop {
  position: absolute;
  inset: -8rem -2rem auto;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.orb,
.grid-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(6px);
  will-change: transform;
}

.orb-blue {
  width: 24rem;
  height: 24rem;
  top: 6%;
  left: -3%;
  background: radial-gradient(
    circle,
    rgba(71, 166, 255, 0.32),
    transparent 70%
  );
}

.orb-green {
  width: 20rem;
  height: 20rem;
  right: 10%;
  bottom: 18%;
  background: radial-gradient(
    circle,
    rgba(88, 255, 168, 0.24),
    transparent 72%
  );
}

.grid-glow {
  width: 44rem;
  height: 44rem;
  top: 8%;
  right: -10%;
  border-radius: 32px;
  background:
    linear-gradient(rgba(71, 166, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(71, 166, 255, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.55;
  mask-image: radial-gradient(circle at center, black 45%, transparent 78%);
}

.hero-content,
.hero-panel {
  position: relative;
}

.hero-content {
  padding: 2rem 0;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(3rem, 6vw, 5.6rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
  max-width: 12ch;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(2rem, 3vw, 3.35rem);
  line-height: 1;
  letter-spacing: -0.03em;
  max-width: 14ch;
  margin-bottom: 0;
}

h3 {
  font-size: 1.2rem;
  margin-bottom: 0.65rem;
}

.hero-copy,
.section-heading + p,
.glass-card p,
.timeline-content p,
.project-visual p,
.contact-card p {
  color: var(--text-soft);
}

.hero-copy {
  max-width: 62ch;
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0 2.3rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  padding: 0.75rem 1.35rem;
  border-radius: 999px;
  font-weight: 700;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

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

.button-primary {
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: #04111e;
  box-shadow: 0 16px 34px rgba(71, 166, 255, 0.24);
}

.button-secondary {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

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

.metric-card,
.glass-card,
.project-card,
.hero-panel,
.timeline-content {
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(17, 22, 32, 0.92),
    rgba(9, 12, 18, 0.96)
  );
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.metric-card {
  padding: 1.2rem;
  border-radius: var(--radius-md);
}

.metric-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.35rem;
}

.metric-label {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.hero-panel {
  padding: 1.4rem;
  border-radius: var(--radius-lg);
}

.panel-header,
.skill-head,
.project-content,
.contact-list {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.panel-header {
  align-items: center;
  margin-bottom: 1rem;
}

.panel-label {
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.panel-status {
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(88, 255, 168, 0.1);
  color: var(--green);
  font-size: 0.8rem;
}

.signal-card {
  padding: 1.15rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.signal-card:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.signal-title,
.project-chip,
.education-year,
.education-focus,
.timeline-date {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.intro-grid,
.projects-grid,
.education-grid,
.contact-layout {
  display: grid;
  gap: 1.2rem;
}

.intro-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.glass-card {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.4rem;
}

.filter-button {
  min-height: 2.8rem;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-soft);
  transition:
    background-color var(--transition),
    border-color var(--transition),
    color var(--transition),
    transform var(--transition);
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.is-active {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(71, 166, 255, 0.12);
  transform: translateY(-1px);
}

.projects-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.project-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  min-height: 100%;
  transition:
    transform var(--transition),
    border-color var(--transition),
    opacity var(--transition);
}

.project-card:hover,
.project-card:focus-within {
  transform: translateY(-6px);
  border-color: var(--border-strong);
}

.project-card.is-hidden {
  display: none;
}

.project-visual {
  padding: 1.45rem;
  min-height: 16rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.gradient-panel {
  background:
    linear-gradient(160deg, rgba(71, 166, 255, 0.22), rgba(3, 7, 16, 0.4)),
    radial-gradient(
      circle at top right,
      rgba(71, 166, 255, 0.28),
      transparent 40%
    ),
    linear-gradient(180deg, #09101b 0%, #05070c 100%);
}

.gradient-panel-alt {
  background:
    linear-gradient(160deg, rgba(71, 166, 255, 0.22), rgba(20, 28, 44, 0.42)),
    radial-gradient(
      circle at top left,
      rgba(88, 255, 168, 0.24),
      transparent 40%
    ),
    linear-gradient(180deg, #090d16 0%, #05070c 100%);
}

.gradient-panel-green {
  background:
    linear-gradient(160deg, rgba(88, 255, 168, 0.18), rgba(6, 18, 15, 0.46)),
    radial-gradient(
      circle at top right,
      rgba(71, 166, 255, 0.16),
      transparent 40%
    ),
    linear-gradient(180deg, #07100c 0%, #05070c 100%);
}

.project-chip {
  display: inline-flex;
  width: fit-content;
  margin-bottom: auto;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.project-content {
  align-items: center;
  padding: 1.35rem 1.45rem 1.55rem;
}

.project-stats {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-soft);
}

.text-link {
  color: var(--blue);
  font-weight: 700;
}

/* Skills, timeline, and contact layouts */
.skills-layout {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 1.25rem;
  align-items: start;
}

.skills-panel,
.tool-cloud,
.timeline {
  display: grid;
  gap: 1rem;
}

.skill-group {
  padding: 1.25rem 1.4rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.skill-head {
  align-items: center;
  margin-bottom: 0.8rem;
}

.skill-head span {
  color: var(--blue);
  font-weight: 700;
}

.skill-bar {
  width: 100%;
  height: 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  overflow: hidden;
}

.skill-bar-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--green));
  box-shadow: 0 0 22px rgba(71, 166, 255, 0.34);
  transition: width 1100ms cubic-bezier(0.22, 1, 0.36, 1);
}

.tools-card h3 {
  margin-bottom: 1rem;
}

.tool-cloud {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tool-cloud span {
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.timeline {
  position: relative;
  padding-left: 1rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 0.25rem;
  width: 2px;
  background: linear-gradient(var(--blue), rgba(88, 255, 168, 0.35));
}

.timeline-item {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 1.25rem;
  align-items: start;
}

.timeline-content {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
}

.timeline-content::before {
  content: "";
  position: absolute;
  left: -1.55rem;
  top: 1.6rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--green) 0%, var(--blue) 100%);
  box-shadow: 0 0 18px rgba(88, 255, 168, 0.28);
}

.timeline-content ul {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--text-soft);
}

.education-grid,
.contact-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.education-card,
.contact-card,
.contact-form {
  min-height: 100%;
}

.education-focus {
  display: inline-flex;
  margin-top: 1rem;
}

.contact-layout {
  align-items: stretch;
}

.contact-list {
  flex-direction: column;
  align-items: flex-start;
  margin-top: 1.5rem;
}

.contact-list a {
  color: var(--blue);
  font-weight: 600;
}

.contact-form {
  display: grid;
  gap: 1rem;
}

.contact-form label {
  display: grid;
  gap: 0.55rem;
  color: var(--text-soft);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  padding: 0.9rem 1rem;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--border-strong);
  box-shadow: 0 0 0 3px rgba(71, 166, 255, 0.18);
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 700ms ease,
    transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* Screen-reader utility for dynamic announcements */
.sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid rgba(88, 255, 168, 0.8);
  outline-offset: 3px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1024px) {
  .hero,
  .skills-layout,
  .projects-grid,
  .intro-grid,
  .education-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 3rem;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .timeline-content::before {
    left: -1.2rem;
  }
}

@media (max-width: 760px) {
  .topbar {
    padding: 0.85rem 0;
    margin-top: 0.6rem;
  }

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

  .nav {
    position: absolute;
    top: calc(100% + 0.8rem);
    right: 0;
    width: min(18rem, 100%);
    padding: 0.75rem;
    border-radius: 24px;
    border: 1px solid var(--border);
    background: rgba(8, 10, 16, 0.96);
    backdrop-filter: blur(18px);
    display: grid;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity var(--transition),
      transform var(--transition),
      visibility var(--transition);
  }

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

  .nav-link {
    width: 100%;
  }

  h1 {
    max-width: 10ch;
  }

  .project-content,
  .panel-header {
    flex-direction: column;
    align-items: start;
  }

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

/* Reduced-motion preferences disable non-essential animation while preserving layout */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .skill-bar-fill {
    transition: none;
  }
}