:root {
  --bg: #ffffff;
  --text: #111;
  --accent: #007acc;
  --nav-bg: #e0e0e0;
  --tab-bg: #f5f5f5;
  --tab-hover: #dcdcdc;
  --tab-active: #007acc;
}

[data-theme="dark"] {
  --bg: #1e1e1e;
  --text: #f0f0f0;
  --accent: #50fa7b;
  --nav-bg: #333;
  --tab-bg: #2a2a2a;
  --tab-hover: #444;
  --tab-active: #50fa7b;
}

body {
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  transition: background 0.3s, color 0.3s;
}

a {
  color: var(--accent);
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

header {
  text-align: center;
  position: relative;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text);
}

.theme-toggle {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: 2px solid var(--text);
  color: var(--text);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}

.tab-nav {
  margin-top: 1rem;
  margin-bottom: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.tablink {
  background: var(--nav-bg);
  border: none;
  color: var(--text);
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 5px 5px 0 0;
  font-weight: bold;
}

.tablink:hover,
.tablink.active {
  background: var(--tab-active);
  color: var(--bg);
}

.tabcontent {
  display: none;
  background: var(--tab-bg);
  padding: 1.5rem;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  margin-top: 0;
}

.tabcontent.active {
  display: block;
}

.project-list {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.project-list li {
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--tab-hover);
  padding-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 600px) {
  .tab-nav {
    flex-direction: column;
    align-items: center;
  }

  .tablink {
    width: 100%;
    text-align: center;
  }
}


/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-form label {
  font-weight: bold;
  margin-bottom: 0.2rem;
}

.contact-form input,
.contact-form textarea {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--tab-hover);
  padding: 0.75rem;
  border-radius: 5px;
  font-size: 1rem;
  width: 100%;
}

.contact-form button {
  background: var(--tab-active);
  color: var(--bg);
  border: none;
  padding: 0.75rem;
  font-weight: bold;
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.3s ease;
}

.contact-form button:hover {
  filter: brightness(1.1);
}