:root {
  color-scheme: light;
  --background: #f4f7fb;
  --background-alt: #eef2ff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --text: #111827;
  --muted: #64748b;
  --primary: #4f46e5;
  --primary-strong: #312e81;
  --border: rgba(17, 24, 39, 0.08);
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --hero-glow: rgba(79, 70, 229, 0.15);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --max-width: 1180px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --background: #050816;
  --background-alt: #0f172a;
  --surface: rgba(15, 23, 42, 0.8);
  --surface-strong: #0f172a;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #8b5cf6;
  --primary-strong: #c4b5fd;
  --border: rgba(148, 163, 184, 0.16);
  --shadow: 0 24px 80px rgba(2, 6, 23, 0.45);
  --hero-glow: rgba(139, 92, 246, 0.2);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  background: radial-gradient(circle at top left, var(--background-alt), transparent 28%), var(--background);
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

button {
  font: inherit;
  cursor: pointer;
}

section {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  padding: 5.5rem 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--primary);
  font-weight: 700;
}

.section-label::before {
  content: "";
  width: 36px;
  height: 1px;
  background: currentColor;
}

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

h1,
h2 {
  line-height: 1.1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 1rem auto 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
  font-weight: 800;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  padding: 0;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

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

.nav-links a {
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(2, 6, 23, 0.62);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.mobile-menu-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
  min-height: calc(100vh - 7rem);
  padding-top: 4rem;
}

.hero__content h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  margin-bottom: 1rem;
  max-width: 680px;
}

.hero__description {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 640px;
  margin-bottom: 1.8rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
  box-shadow: 0 16px 30px rgba(79, 70, 229, 0.2);
}

.btn--ghost {
  border-color: var(--border);
  background: var(--surface);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.social-link:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  color: var(--text);
}

.hero__visual {
  position: relative;
}

.hero__image-frame {
  padding: 1rem;
  border-radius: 34px;
  background: linear-gradient(135deg, var(--surface), var(--surface-strong));
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.hero__image-frame img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  border-radius: 24px;
}

.hero__panel {
  position: absolute;
  left: -1.2rem;
  bottom: -1.2rem;
  max-width: 280px;
  padding: 1rem 1.1rem;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.hero__panel h2 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.hero__panel p {
  color: var(--muted);
  font-size: 0.95rem;
}

.about__content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.6rem;
  align-items: start;
}

.about__text {
  font-size: 1.02rem;
  color: var(--muted);
  display: grid;
  gap: 1rem;
}

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

.about__card {
  padding: 1.2rem 1.3rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.about__card span {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.skills-grid,
.projects-grid,
.certificates-grid {
  display: grid;
  gap: 1.2rem;
}

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

.project-card,
.skill-card,
.certificate-card,
.experience-card,
.contact-card,
.timeline-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.skill-card {
  padding: 1.25rem;
}

.skill-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.skill-card__meta span {
  color: var(--muted);
  font-size: 0.92rem;
}

.skill-bar {
  position: relative;
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  overflow: hidden;
}

.skill-bar__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--primary-strong));
  width: var(--value);
  transition: width 0.4s ease;
}

.skill-card p {
  margin-top: 0.6rem;
  color: var(--muted);
}

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

.project-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.project-card__body {
  padding: 1.25rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.card-tags span,
.tech-list li {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  color: var(--primary);
  font-size: 0.8rem;
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 1rem 0 0;
  list-style: none;
}

.project-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.project-card__actions a {
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text);
}

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

.experience-card {
  padding: 1.25rem;
}

.experience-card__top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.experience-card ul {
  margin: 0.5rem 0 0 1.2rem;
  color: var(--muted);
}

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

.certificate-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: center;
}

.certificate-card__body {
  padding: 1.1rem 1.15rem 1.2rem;
  display: grid;
  gap: 0.45rem;
}

.certificate-card__body h3 {
  font-size: 1.05rem;
  line-height: 1.35;
}

.certificate-card__body p {
  color: var(--muted);
  font-size: 0.94rem;
}

.certificate-card {
  cursor: zoom-in;
}

.image-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: rgba(2, 6, 23, 0.84);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.image-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.image-modal__image {
  max-width: min(92vw, 860px);
  max-height: min(86vh, 760px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.image-modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  font-size: 1.3rem;
  color: white;
  background: rgba(255, 255, 255, 0.16);
}

.timeline {
  position: relative;
  display: grid;
  gap: 1rem;
  padding-left: 1.25rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0.2rem;
  width: 2px;
  height: 100%;
  background: color-mix(in srgb, var(--primary) 30%, transparent);
}

.timeline-item {
  position: relative;
  padding: 1.2rem 1.2rem 1.2rem 1.45rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -0.2rem;
  top: 1.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
}

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

.contact-card {
  padding: 1.2rem;
}

.contact-card h3 {
  margin-bottom: 0.4rem;
}

.contact-card p {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  padding: 2rem 1rem 3rem;
  text-align: center;
  color: var(--muted);
}

.back-to-top {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 30;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: white;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

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

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-strong));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 40;
}

.loader {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--background);
  z-index: 50;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.loader__ring {
  width: 62px;
  height: 62px;
  border-radius: 50%;
  border: 3px solid color-mix(in srgb, var(--primary) 20%, transparent);
  border-top-color: var(--primary);
  animation: spin 0.8s linear infinite;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

@media (max-width: 900px) {
  .hero,
  .about__content,
  .skills-grid,
  .projects-grid,
  .certificates-grid,
  .contact-list {
    grid-template-columns: 1fr;
  }

  .hero__panel {
    position: static;
    margin-top: 1rem;
    max-width: none;
  }
}

@media (max-width: 760px) {
  body.menu-open {
    overflow: hidden;
  }

  .site-header {
    border-radius: 24px;
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .theme-toggle {
    margin-left: 0.2rem;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: min(82vw, 320px);
    height: 100dvh;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    padding: 5.5rem 1.25rem 1.5rem;
    background: var(--surface-strong);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateX(100%);
    transition: transform 0.28s ease;
    z-index: 40;
  }

  .nav-links.is-open {
    transform: translateX(0);
  }

  .nav-links a {
    width: 100%;
    padding: 0.8rem 0.95rem;
    border-radius: 14px;
  }

  .section {
    padding: 4.2rem 0;
  }

  .hero {
    padding-top: 2rem;
    min-height: auto;
    gap: 1.6rem;
  }

  .hero__content h1 {
    font-size: clamp(2rem, 8vw, 2.7rem);
  }

  .hero__description {
    font-size: 1rem;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__image-frame img {
    height: 320px;
  }

  .section-heading h2 {
    font-size: clamp(1.5rem, 4.5vw, 2rem);
  }

  .about__content {
    gap: 1.2rem;
  }

  .project-card img,
  .certificate-card img {
    height: 200px;
  }

  .experience-card__top {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-card .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .site-header {
    width: min(var(--max-width), calc(100% - 1rem));
    padding: 0.75rem 0.8rem;
  }

  .hero__panel {
    padding: 0.95rem;
  }

  .skill-card,
  .project-card__body,
  .certificate-card__body,
  .experience-card,
  .contact-card,
  .timeline-item {
    padding: 1rem;
  }
}