/* NovaMind 全站通用 CSS：優化按鈕、卡片與動畫 */

:root {
  --primary-color: #003366;
  --secondary-color: #005599;
  --accent-color: #FFD700;
  --text-color: #333;
  --light-bg: #f8f8f8;
  --dark-bg: #e0e0e0;
  --border-radius: 12px;
  --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  --transition-speed: 0.3s ease;
}

body {
  font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
  margin: 0;
  padding: 0;
  background: var(--light-bg);
  color: var(--text-color);
  scroll-behavior: smooth;
}

header {
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: var(--box-shadow);
  position: relative;
  z-index: 10;
}

header .logo img {
  height: 48px;
  transition: transform var(--transition-speed);
}
header .logo img:hover {
  transform: scale(1.05);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
}
nav a {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: background var(--transition-speed), color var(--transition-speed);
  font-weight: 600;
}
nav a:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--accent-color);
}

.language-toggle button {
  background: white;
  color: var(--primary-color);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-speed);
}
.language-toggle button.active {
  background: var(--accent-color);
  color: var(--primary-color);
  box-shadow: var(--box-shadow);
}
.language-toggle button:hover:not(.active) {
  background: var(--dark-bg);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

section {
  background: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  margin-bottom: 2rem;
  box-shadow: var(--box-shadow);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
section.fade-in {
  opacity: 1;
  transform: translateY(0);
}

h1, h2, h3 {
  color: var(--primary-color);
  font-weight: 700;
  margin: 0 0 1rem;
}
h1 { font-size: 2.4rem; text-align: center; }
h2 { font-size: 2rem; border-bottom: 2px solid var(--accent-color); padding-bottom: 0.5rem; }
h3 { font-size: 1.5rem; color: var(--secondary-color); }

.cta-button {
  display: inline-block;
  background: var(--accent-color);
  color: var(--primary-color);
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--box-shadow);
  transition: background var(--transition-speed), transform var(--transition-speed);
}
.cta-button:hover {
  background: #ffe13e;
  transform: translateY(-3px);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}
.grid-item {
  background: var(--dark-bg);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}
.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

img {
  max-width: 100%;
  border-radius: var(--border-radius);
  display: block;
  margin: 0 auto;
}

footer {
  background: var(--primary-color);
  color: white;
  text-align: center;
  padding: 1.5rem;
  margin-top: 3rem;
  box-shadow: 0 -4px 8px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }
  main {
    padding: 1rem;
  }
  section {
    padding: 1.5rem;
  }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
}