:root {
  --bg: #ffffff;
  --surface: #f7f8fa;
  --text: #111111;
  --muted: #555555;
  --accent: #0b66ff;
  --accent-dark: #064ec4;
  --border: #e5e7eb;
  --radius: 18px;
  --radius-sm: 12px;
  --max-width: 1080px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
  --transition: 0.25s ease;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-family: var(--font);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0c0c0e;
  --surface: #161618;
  --text: #e8e8ed;
  --muted: #8e8e9a;
  --accent: #4a8eff;
  --accent-dark: #3070dd;
  --border: #2a2a2e;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c0c0e;
    --surface: #161618;
    --text: #e8e8ed;
    --muted: #8e8e9a;
    --accent: #4a8eff;
    --accent-dark: #3070dd;
    --border: #2a2a2e;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@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;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

a {
  color: inherit;
}

p {
  margin-top: 0;
}

ul {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.5rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 8px 16px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  z-index: 1000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 24px 0px
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 8px 0 48px;
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.04em;
  transition: background var(--transition), color var(--transition);
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent);
}

.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle .sun {
  display: block;
}

.theme-toggle .moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun {
    display: none;
  }

  :root:not([data-theme="light"]) .theme-toggle .moon {
    display: block;
  }
}

.hero-content {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.eyebrow,
.section-kicker {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.82rem;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  line-height: 1.1;
  margin-top: 0;
}

h1 {
  max-width: 850px;
  font-size: clamp(2.7rem, 7vw, 5.8rem);
  letter-spacing: -0.07em;
  margin-bottom: 24px;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.05em;
  margin-bottom: 0;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.hero-description {
  max-width: 760px;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  color: var(--muted);
  margin-bottom: 0;
}

.hero-actions,
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button,
.contact-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  font-family: inherit;
  font-size: inherit;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.button:hover,
.contact-links a:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.button:focus-visible,
.contact-links a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.button-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.button-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
  color: var(--muted);
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 24px;
}

.section-heading {
  margin-bottom: 28px;
}

.content-card,
.project-card,
.experience-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.content-card,
.project-card {
  box-shadow: var(--shadow);
}

.projects-grid,
.education-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
}

.project-image {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 20px;
  line-height: 0;
}

.project-image svg {
  width: 100%;
  height: auto;
  display: block;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.badge {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--accent);
  background: var(--bg);
  font-size: 0.8rem;
  font-weight: 800;
  transition: background var(--transition), border-color var(--transition);
}

.tech-stack {
  margin-top: auto;
  color: var(--accent);
  font-weight: 800;
}

.timeline {
  display: grid;
  gap: 18px;
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--border);
  border-radius: 1px;
}

.experience-card {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -24px;
  top: 34px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  transition: background var(--transition), border-color var(--transition);
}

.experience-card header p {
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 16px;
}

.contact-section {
  text-align: center;
}

.contact-section p {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  color: var(--muted);
}

.contact-form {
  max-width: 560px;
  margin: 32px auto 0;
  text-align: left;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11, 102, 255, 0.15);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #e53e3e;
}

.form-group input.error:focus,
.form-group textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.15);
}

.form-feedback {
  margin-top: 12px;
  font-size: 0.9rem;
  font-weight: 700;
}

.form-feedback.success {
  color: #38a169;
}

.form-feedback.error {
  color: #e53e3e;
}

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

.contact-links {
  justify-content: center;
  margin-top: 24px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  transition: border-color var(--transition);
}

.site-footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 768px) {
  .hero {
    padding-bottom: 48px;
  }

  .navbar {
    align-items: flex-start;
    padding-bottom: 32px;
  }

  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 16px;
    right: 16px;
    flex-direction: column;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px;
    box-shadow: var(--shadow);
    z-index: 100;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    border-bottom: none;
  }

  .nav-links a:hover {
    background: var(--bg);
  }

  .navbar {
    position: relative;
  }

  .section {
    padding: 48px 20px;
  }

  .projects-grid,
  .education-grid {
    grid-template-columns: 1fr;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .navbar {
    flex-direction: column;
  }

  .nav-links {
    top: 116px;
  }

  .hero-actions,
  .contact-links {
    flex-direction: column;
  }

  .button,
  .contact-links a {
    width: 100%;
  }
}