:root {
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-primary: #42b883; /* Vue green */
  --color-primary-hover: #3aa876;
  --color-accent: #35495e; /* Vue dark blue */
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --transition-base: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111827;
    --color-surface: #1f2937;
    --color-primary: #42b883;
    --color-primary-hover: #34a36f;
    --color-accent: #41b47d;
    --color-text: #f3f4f6;
    --color-muted: #9ca3af;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
  }
}

body.dark {
  --color-bg: #111827;
  --color-surface: #1f2937;
  --color-primary: #42b883;
  --color-primary-hover: #34a36f;
  --color-accent: #41b47d;
  --color-text: #f3f4f6;
  --color-muted: #9ca3af;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  transition: var(--transition-base);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
  padding: 24px 32px;
  flex-wrap: wrap;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  transition: var(--transition-base);
}

header img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
}

header .info {
  flex: 1;
  margin-left: 24px;
  min-width: 250px;
}

header h1 {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-primary);
}

header p {
  margin: 6px 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

section {
  background-color: var(--color-surface);
  margin: 32px auto;
  padding: 32px;
  border-radius: var(--radius-lg);
  max-width: 900px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

section:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

section h2 {
  color: var(--color-primary);
  margin-top: 0;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 8px;
  font-size: 1.4rem;
  font-weight: 600;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

ul {
  padding-left: 20px;
  margin-top: 12px;
}

.fade-in {
  display: none;
}

.toggle-btn {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 16px;
  background-color: var(--color-primary);
  color: white;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
  border: none;
}

.toggle-btn:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    text-align: center;
  }

  header img {
    margin-bottom: 16px;
  }

  header .info {
    margin-left: 0;
  }

  section {
    padding: 24px;
    margin: 24px 12px;
  }
}

.theme-toggle {
  position: absolute;   
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: inline-block;
  width: 60px;
  height: 32px;
}


.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.theme-toggle label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  cursor: pointer;
  width: 100%;
  height: 100%;
  background-color: #42b883;
  border-radius: 32px;
  padding: 0 5px;
  box-sizing: border-box;
  transition: background-color 0.3s;
}

.theme-toggle .icon-moon,
.theme-toggle .icon-sun {
  font-size: 16px;
  transition: opacity 0.3s;
}

.theme-toggle .slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 28px;
  height: 28px;
  background-color: #fff;
  border-radius: 50%;
  transition: transform 0.3s;
  z-index: 1;
}

.theme-toggle input:checked + label {
  background-color: #fff;
}

.theme-toggle input:checked + label .slider {
  transform: translateX(28px);
  background-color: #42b883;
}

.theme-toggle .icon-sun {
  opacity: 1;
}

.theme-toggle .icon-sun {
  opacity: 1;
}