:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #555555;
  --card: #f8f9fa;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --nav-bg: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --card: #1e293b;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --border: #334155;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
  --nav-bg: rgba(15, 23, 42, 0.9);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
}

nav {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover, nav a.active {
  color: var(--accent);
}

.theme-toggle {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

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

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  align-items: center;
  margin: 2rem 0 3rem;
}

.hero img {
  width: 100%;
  border-radius: 16px;
  box-shadow: var(--shadow);
  object-fit: cover;
  aspect-ratio: 3/4;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn-second {
  margin-left: 0.75rem;
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: white;
}

.section {
  margin: 3rem 0;
}

.section h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 0.25rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-4px);
}

.card h3 {
  margin-bottom: 0.5rem;
}

.card .date {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.skill {
  background: var(--accent);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.resume-section {
  background: var(--card);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.resume-section h3 {
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.resume-item {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.resume-item:last-child {
  border-bottom: none;
}

.resume-item h4 {
  margin-bottom: 0.25rem;
}

.resume-item .meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 600px;
}

input, textarea {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
}

textarea {
  min-height: 150px;
  resize: vertical;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

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

main {
  overflow-wrap: break-word;
}

/* Hamburger button: hidden on desktop */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 36px;
  padding: 0 9px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle:focus-visible,
.theme-toggle:focus-visible,
nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  nav {
    padding: 0.75rem 1rem;
  }
  nav .logo {
    white-space: nowrap;
    font-size: 1.15rem;
  }
  .nav-right {
    gap: 0.5rem;
  }
  .theme-toggle {
    padding: 0.35rem 0.6rem;
    font-size: 0.8rem;
    white-space: nowrap;
    height: 36px;
  }
  .nav-toggle {
    display: flex;
  }
  /* Collapsed menu (only when JS is running, so links stay reachable without it) */
  html.js #nav-menu {
    display: none;
  }
  #nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 0.5rem 1rem 1rem;
  }
  html.js nav.menu-open #nav-menu {
    display: flex;
  }
  #nav-menu a {
    display: block;
    padding: 0.75rem 0.25rem;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border);
  }
  #nav-menu li:last-child a {
    border-bottom: none;
  }
  html:not(.js) #nav-menu {
    position: static;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.75rem;
    box-shadow: none;
    border: none;
    padding: 0;
  }
  html:not(.js) .nav-toggle {
    display: none;
  }

  main {
    padding: 1.25rem 1rem;
  }
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.5rem;
    margin: 1rem 0 2rem;
  }
  .hero h1 {
    font-size: 1.85rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .hero img {
    max-width: 280px;
    margin: 0 auto;
    display: block;
  }
  .btn-second {
    margin-left: 0.5rem;
  }
  .section {
    margin: 2rem 0;
  }
  .section h2 {
    font-size: 1.5rem;
  }
  .card,
  .resume-section {
    padding: 1.25rem;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  footer {
    padding: 1.5rem 1rem;
  }
}

@media (max-width: 380px) {
  .hero .btn {
    display: block;
    text-align: center;
  }
  .btn-second {
    margin-left: 0;
    margin-top: 0.75rem;
  }
}