:root {
  --bg-color: #f9f9f9;
  --text-color: #222;
  --accent-color: #0077cc;
  --accent-hover: #005fa3;
  --card-bg: #fff;
  --link-color: var(--accent-color);
  --font-sans: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #eee;
  --card-bg: #1f1f1f;
  --link-color: #66aaff;
  --accent-hover: #5599dd;
}

* {
  box-sizing: border-box;
}

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

header {
  background: var(--accent-color);
  color: #fff;
  padding: 1rem 1rem 1rem 1rem;
  text-align: center;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: auto;
}

header p {
  font-size: 1.1rem;
  margin-top: 0.5rem;
  opacity: 0.9;
  font-style: italic;
  padding: auto;
}

nav {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: background-color 0.25s ease;
}

nav a:hover {
  background-color: rgba(255 255 255 / 0.25);
}

nav button {
  background-color: rgba(255 255 255 / 0.25);
  border: none;
  color: #fff;
  cursor: pointer;
  font-size: 1.3rem;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  transition: background-color 0.25s ease;
}

nav button:hover {
  background-color: #fff;
  color: var(--accent-color);
}

main {
  width: 90%;
  max-width: 900px;
  margin: 2.5rem auto 4rem;
}

.project-section {
  background: var(--card-bg);
  padding: 2rem;
  margin-bottom: 3rem;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  animation: fadeInUp 0.7s ease both;
}

.project-section h2 {
  border-bottom: 3px solid var(--accent-color);
  padding-bottom: 0.5rem;
  font-size: 1.7rem;
}

.project-section p {
  font-size: 1rem;
  line-height: 1.5;
}

.project-img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: 10px;
  margin: 1rem 0 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn {
  background-color: var(--accent-color);
  color: #fff;
  text-decoration: none;
  padding: 0.5rem 1.2rem;
  margin-right: 1rem;
  border-radius: 24px;
  font-weight: 600;
  transition: background-color 0.3s ease;
  display: inline-block;
}

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

.btn-secondary {
  background-color: #444;
}

.btn-secondary:hover {
  background-color: #222;
}

.back-home {
  text-align: center;
  margin-top: 2rem;
}

footer {
  background: #eee;
  color: #555;
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.9rem;
  border-top: 1px solid #ccc;
}

[data-theme="dark"] footer {
  background: #1a1a1a;
  color: #aaa;
  border-top-color: #333;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  nav {
    gap: 1rem;
  }

  .project-section h2 {
    font-size: 1.4rem;
  }
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropbtn {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  cursor: pointer;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: var(--card-bg);
  min-width: 160px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  border-radius: 8px;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.dropdown-content a {
  color: var(--text-color);
  padding: 0.75rem 1rem;
  text-decoration: none;
  display: block;
  border-bottom: 1px solid #ddd;
}

.dropdown-content a:last-child {
  border-bottom: none;
}

.dropdown:hover .dropdown-content {
  display: block;
  opacity: 1;
}

.dropdown-content a:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .dropdown-content a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.hamburger {
  display: none;
  font-size: 1.8rem;
  background: none;
  color: white;
  border: none;
  cursor: pointer;
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  z-index: 1001;
}

#menu {
  display: flex;
  gap: 0.5rem;
}

@media (max-width: 768px) {
  #menu {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    width: 50%;
    background-color: rgba(20, 20, 20, 0.85);
    border-radius: 10px;
    z-index: 1000;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(3px);

    transform: translateY(calc(100% + 0.5rem));
  }

  #menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 0;
    width: 100%;
    text-align: left;
    font-size: 1.1rem;
  }

  #menu button#darkToggle {
    align-self: center;
    margin-top: 1rem;
    padding: 0.4rem 0.8rem;
    font-size: 1.3rem;
  }

  #menu.active {
    display: flex;
  }

  .hamburger {
    display: block;
  }
}