:root {
  color-scheme: dark;
  --bg: #0b0f19;
  --bg-soft: #111827;
  --card: rgba(17, 24, 39, 0.8);
  --border: rgba(148, 163, 184, 0.16);
  --text: #f9fafb;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --secondary: #8b5cf6;
  --accent: #22c55e;
  --shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

body.light {
  color-scheme: light;
  --bg: #f8fafc;
  --bg-soft: #ffffff;
  --card: rgba(255, 255, 255, 0.8);
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --secondary: #7c3aed;
  --accent: #16a34a;
  --shadow: 0 20px 80px rgba(15, 23, 42, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.12), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(139, 92, 246, 0.14), transparent 32%),
    var(--bg);
  color: var(--text);
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

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

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

button,
input,
textarea {
  font: inherit;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 1000;
  background: var(--primary);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: 999px;
}

.cursor-glow {
  position: fixed;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.22), transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 0;
  filter: blur(20px);
  opacity: 0.8;
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 200;
}

.loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: grid;
  place-items: center;
  z-index: 999;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader__ring {
  width: 4rem;
  height: 4rem;
  border: 4px solid rgba(255,255,255,0.15);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin-bottom: 1rem;
}

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

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.section {
  padding: 5rem 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(24px);
  background: rgba(11, 15, 25, 0.75);
  border-bottom: 1px solid var(--border);
}

body.light .site-header {
  background: rgba(248, 250, 252, 0.75);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: 0.4rem;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding-top: 4rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1rem;
}

h1, h2, h3 {
  margin: 0;
  letter-spacing: -0.03em;
  font-family: 'Manrope', sans-serif;
}

.hero h1 {
  font-size: clamp(2.3rem, 4vw, 4.3rem);
  line-height: 1.04;
  margin-bottom: 1rem;
}

.hero p,
.about-copy p,
.contact-copy p {
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

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

.button--primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: 0 10px 25px rgba(59,130,246,0.25);
}

.button--secondary {
  background: rgba(255,255,255,0.06);
  border-color: var(--border);
}

.button--ghost {
  background: transparent;
  border-color: var(--border);
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.hero__badges span {
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255,255,255,0.03);
}

.hero__card {
  position: relative;
  padding: 1rem;
  border-radius: 2rem;
  background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero__card img {
  width: 100%;
  border-radius: 1.25rem;
  object-fit: cover;
  aspect-ratio: 1 / 1.1;
}

.hero__card-content {
  padding: 1.2rem 0.35rem 0.3rem;
}

.hero__card-content h2 {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
}

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

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.stat-card,
.about-card,
.timeline-item,
.skill-card,
.project-card,
.achievement-card,
.cert-card,
.education-item,
.language-card,
.contact-card,
.contribution-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.stat-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.stat-card strong {
  font-size: 2rem;
  color: var(--text);
}

.stat-card span {
  color: var(--muted);
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
}

.about-card {
  padding: 1.5rem;
}

.about-card ul {
  padding-left: 1rem;
  color: var(--muted);
  display: grid;
  gap: 0.7rem;
}

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

.timeline-item {
  padding: 1.4rem;
  display: grid;
  gap: 0.8rem;
}

.timeline-item__header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.timeline-item__meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.timeline-item ul {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}

.skills-grid,
.projects-grid,
.cards-grid,
.languages-grid {
  display: grid;
  gap: 1rem;
}

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

.skill-card {
  padding: 1.4rem;
}

.skill-card ul {
  padding-left: 1rem;
  margin: 0.8rem 0 0;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}

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

.project-card {
  padding: 1.4rem;
  display: grid;
  gap: 1rem;
}

.project-media {
  height: 170px;
  border-radius: 1rem;
  background: linear-gradient(135deg, rgba(59,130,246,0.24), rgba(139,92,246,0.2));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.project-media::before,
.project-media::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.18);
}

.project-media::before {
  width: 140px;
  height: 140px;
  top: -30px;
  left: -20px;
}

.project-media::after {
  width: 90px;
  height: 90px;
  bottom: -20px;
  right: 20px;
}

.project-card__meta,
.achievement-card p,
.cert-card p,
.education-item p,
.language-card p {
  color: var(--muted);
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tech-stack span {
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  color: var(--text);
  font-size: 0.92rem;
}

.project-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

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

.achievement-card,
.cert-card {
  padding: 1.3rem;
}

.education-list {
  display: grid;
  gap: 1rem;
}

.education-item {
  padding: 1.4rem;
}

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

.language-card {
  padding: 1.3rem;
}

.language-progress {
  margin-top: 0.7rem;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}

.language-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.contribution-section {
  padding-top: 0;
}

.contribution-card {
  padding: 1.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.2rem;
}

.contribution-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.45rem;
}

.contribution-grid span {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
  animation: pulse 2.4s ease-in-out infinite;
}

.contribution-grid span:nth-child(2n) { animation-delay: 0.2s; }
.contribution-grid span:nth-child(3n) { animation-delay: 0.4s; }
.contribution-grid span:nth-child(5n) { animation-delay: 0.6s; }

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.45; }
  50% { transform: scale(1.08); opacity: 1; }
}

.contact-card {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 1.5rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  color: var(--muted);
}

.contact-list a {
  color: var(--text);
}

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

.contact-form label {
  display: grid;
  gap: 0.45rem;
  color: var(--text);
}

.contact-form input,
.contact-form textarea {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  padding: 0.9rem 1rem;
  border-radius: 14px;
  width: 100%;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid rgba(59,130,246,0.25);
  border-color: var(--primary);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.4rem 0 2rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  gap: 1rem;
}

.back-to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: 0;
  color: white;
  box-shadow: var(--shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: 50;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (max-width: 900px) {
  .hero,
  .about-grid,
  .contact-card {
    grid-template-columns: 1fr;
  }

  .stats,
  .skills-grid,
  .projects-grid,
  .cards-grid,
  .languages-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contribution-card {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 700px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    right: 1rem;
    top: calc(100% + 0.75rem);
    flex-direction: column;
    align-items: flex-start;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 0.8rem;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: all 0.2s ease;
  }

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

  .stats,
  .skills-grid,
  .projects-grid,
  .cards-grid,
  .languages-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}