:root {
  --color-background: #f7f9fc;
  --color-surface: #ffffff;
  --color-text: #1f2933;
  --color-muted: #66758d;
  --color-accent: #2563eb;
  --color-accent-contrast: #ffffff;
  --shadow-md: 0 18px 36px rgba(15, 23, 42, 0.12);
  --shadow-sm: 0 10px 24px rgba(15, 23, 42, 0.08);
  --radius-lg: 1.5rem;
  --radius-md: 1rem;
  --transition-base: 0.3s ease;
}

body[data-theme="dark"] {
  --color-background: #111827;
  --color-surface: #1f2937;
  --color-text: #e5e7eb;
  --color-muted: #9ca3af;
  --color-accent: #60a5fa;
  --shadow-md: 0 18px 36px rgba(8, 11, 19, 0.55);
  --shadow-sm: 0 10px 24px rgba(8, 11, 19, 0.45);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Roboto, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

a:hover,
a:focus {
  text-decoration: underline;
}

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

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-base), border-color var(--transition-base), opacity var(--transition-base);
  will-change: backdrop-filter, background-color;
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-color: rgba(15, 23, 42, 0.05);
}

body[data-theme="dark"] .site-header {
  background-color: transparent;
  border-color: transparent;
}

body[data-theme="dark"] .site-header.is-scrolled {
  background-color: rgba(17, 24, 39, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-color: rgba(148, 163, 184, 0.12);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.brand__link {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.site-nav .nav-list {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-weight: 500;
}

.theme-toggle {
  border: none;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 0.6rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  font-weight: 600;
}

.theme-toggle:hover,
.theme-toggle:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.theme-toggle__label {
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.hero {
  padding: 6rem 0 5rem;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2.5rem, 5vw, 3.6rem);
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--color-muted);
  margin-bottom: 1.2rem;
}

.hero-greeting {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

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

.hero-image {
  justify-self: center;
  width: min(320px, 80%);
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.6rem;
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  border-radius: 999px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.cta:hover,
.cta:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cta--ghost {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  box-shadow: none;
}

.cta--ghost:hover,
.cta--ghost:focus {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: var(--shadow-sm);
}

section {
  scroll-margin-top: 5rem;
}

.experience,
.projects,
.awards,
.skills,
.contact {
  padding: 4rem 0;
}

.projects {
  padding-top: 4.5rem;
}

.experience h2,
.projects h2,
.awards h2,
.skills h2,
.contact h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.experience-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  display: grid;
  gap: 1rem;
}

.experience-card header h3 {
  margin: 0;
  font-size: 1.3rem;
}

.experience-meta {
  margin: 0.4rem 0 0;
  color: var(--color-muted);
  font-weight: 500;
}

.experience-card ul {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.35rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover,
.project-card:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 24px 40px rgba(15, 23, 42, 0.18);
}

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

.project-card__body {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.project-link {
  align-self: flex-start;
  color: var(--color-accent);
  font-weight: 600;
}

.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.award-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  box-shadow: var(--shadow-md);
  border-left: 6px solid var(--color-accent);
}

.award-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

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

.skill-list li {
  background-color: var(--color-surface);
  padding: 0.7rem 1.1rem;
  border-radius: 0.9rem;
  box-shadow: var(--shadow-sm);
  font-weight: 500;
}

.contact-container {
  display: grid;
  gap: 3rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}

.contact-details {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.contact-details span {
  font-weight: 600;
}

.contact-form {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  display: grid;
  gap: 1rem;
}

.contact-form label {
  font-weight: 600;
}

.contact-form input,
.contact-form textarea {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 0.6rem;
  padding: 0.75rem;
  font-size: 1rem;
  background-color: transparent;
  color: inherit;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.contact-form textarea {
  min-height: 160px;
  resize: none;
  overflow-y: auto;
}

body[data-theme="dark"] .contact-form input,
body[data-theme="dark"] .contact-form textarea {
  border-color: rgba(148, 163, 184, 0.2);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--color-accent);
  outline: none;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.contact-form button {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 0.85rem 1.3rem;
  border-radius: 0.7rem;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.contact-form button:hover,
.contact-form button:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.form-feedback {
  min-height: 1.5rem;
  margin: 0;
  font-weight: 500;
}

.site-footer {
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  padding: 2rem 0;
  background-color: var(--color-surface);
}

body[data-theme="dark"] .site-footer {
  border-color: rgba(148, 163, 184, 0.15);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }

  .hero-image {
    order: -1;
  }

  .hero-actions {
    justify-content: center;
  }

  .header-content {
    gap: 1rem;
  }

  .site-nav .nav-list {
    gap: 1rem;
  }
}

@media (max-width: 600px) {
  .site-header {
    position: static;
  }

  .header-content {
    flex-direction: column;
  }

  .site-nav .nav-list {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 4.5rem 0 3.5rem;
  }

  .experience,
  .projects,
  .awards,
  .skills,
  .contact {
    padding: 3rem 0;
  }

  .contact-form {
    padding: 1.5rem;
  }
}