/* shared design system for Sanguo: New Dynasty website */
:root {
  --bg-primary: #0b0b0d;
  --bg-secondary: #141417;
  --bg-tertiary: #1b1b22;
  --color-primary: #f5f5f7;
  --color-secondary: #8e8e93;
  --accent-red: #e53935;
  --accent-red-hover: #ef5350;
  --accent-gold: #fbc02d;
  --accent-gold-hover: #fdd835;
  --border-color: rgba(255, 255, 255, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--color-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Header / Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(11, 11, 13, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(135deg, var(--color-primary) 30%, var(--accent-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--accent-red);
  -webkit-text-fill-color: var(--accent-red);
}

nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-secondary);
  transition: color 0.2s ease;
}

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

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 2rem;
  padding-left: 2rem;
  border-left: 1px solid var(--border-color);
}

.lang-switcher a {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--color-secondary);
  transition: all 0.2s ease;
}

.lang-switcher a:hover {
  color: var(--color-primary);
  background: rgba(255,255,255,0.08);
}

.lang-switcher a.active {
  color: var(--accent-red);
  background: rgba(229,57,53,0.12);
}

@media (max-width: 768px) {
  .lang-switcher {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
  }
}

/* Hero Section */
.hero {
  padding: 6rem 2rem 4rem 2rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.hero-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  background-color: rgba(229, 57, 53, 0.1);
  border: 1px solid rgba(229, 57, 53, 0.3);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-red);
  margin-bottom: 1.5rem;
  letter-spacing: 1px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
  background: linear-gradient(to bottom, #ffffff 60%, #a1a1a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-secondary);
  max-width: 650px;
  margin: 0 auto 2.5rem auto;
}

.download-badge {
  display: inline-block;
  background-color: #000;
  color: #fff;
  border: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.download-badge:hover {
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.2);
  box-shadow: 0 6px 24px rgba(229, 57, 53, 0.2);
}

/* Feature Grid */
.features {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 3rem;
  background: linear-gradient(to bottom, #fff, #a1a1a6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(229, 57, 53, 0.3);
}

.card-icon {
  font-size: 2rem;
  color: var(--accent-red);
  margin-bottom: 1.5rem;
}

.card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.card p {
  color: var(--color-secondary);
  font-size: 0.95rem;
}

/* Screenshots Showcase */
.showcase {
  background-color: var(--bg-secondary);
  padding: 5rem 2rem;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.slider-container {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.screenshot-slider {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 1rem 0;
  scrollbar-width: none; /* Firefox */
}

.screenshot-slider::-webkit-scrollbar {
  display: none; /* Safari & Chrome */
}

.screenshot-item {
  flex: 0 0 400px;
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid var(--border-color);
  transition: transform 0.3s ease, border-color 0.3s ease;
  background-color: #000;
  aspect-ratio: 2688/1242;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.screenshot-item:hover {
  transform: scale(1.02);
  border-color: var(--accent-red);
}

/* Document / Page Content (Support & Privacy) */
.page-container {
  max-width: 800px;
  margin: 4rem auto;
  padding: 0 2rem;
}

.page-container h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.page-container h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--accent-gold);
}

.page-container p, .page-container li {
  color: var(--color-secondary);
  font-size: 1.05rem;
  margin-bottom: 1.2rem;
}

.page-container ul {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.contact-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-top: 3rem;
  text-align: center;
}

.contact-button {
  display: inline-block;
  background-color: var(--accent-red);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  margin-top: 1rem;
  transition: background-color 0.2s ease;
}

.contact-button:hover {
  background-color: var(--accent-red-hover);
}

/* Footer */
footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
  list-style: none;
}

.footer-links a {
  color: var(--color-secondary);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.copyright {
  color: var(--color-secondary);
  font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .screenshot-item {
    flex: 0 0 280px;
  }
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  nav ul {
    gap: 1.5rem;
  }
  .lang-switcher {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
  }
}