/* 拼境 Landing Pages - Shared Stylesheet */

:root {
  --color-bg-primary: #F5EDD8;
  --color-bg-secondary: #E8D8B8;
  --color-accent: #B07038;
  --color-secondary: #1E4D72;
  --color-text-primary: #2A180A;
  --color-text-secondary: #7A5A38;
  --color-card: #FFFBF5;
  --color-border: #E0D0B8;
  --color-shadow: rgba(42, 24, 10, 0.12);
  --color-success: #6B8E3D;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --font-serif: 'Noto Serif SC', 'Noto Serif', serif;
  --font-sans: 'Noto Sans SC', 'Noto Sans', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  background-attachment: fixed;
  line-height: 1.6;
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text-primary);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

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

a:hover {
  color: var(--color-secondary);
}

/* Navigation */
nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 251, 245, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px var(--color-shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.1em;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--color-accent);
}

/* Language Toggle Button */
.lang-toggle {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 2rem;
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  font-weight: 600;
}

.lang-toggle:hover {
  background-color: var(--color-accent);
  color: white;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: var(--spacing-2xl) var(--spacing-lg);
}

/* Hero Section */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(176, 112, 56, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
  font-family: var(--font-serif);
  font-weight: 500;
}

.hero .description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.75rem;
  border: 2px solid transparent;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: #9a5a2a;
  border-color: #9a5a2a;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(176, 112, 56, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

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

.btn-googleplay {
  background-color: #1f2937;
  color: white;
  border-color: #1f2937;
  font-weight: 600;
}

.btn-googleplay:hover {
  background-color: #111827;
  border-color: #111827;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* Download Section */
.download-section {
  margin-top: var(--spacing-xl);
}

.apk-link {
  display: inline-block;
  margin-top: var(--spacing-lg);
  font-size: 0.95rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid currentColor;
}

.apk-link:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

.apk-help-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
}

.apk-help-text a {
  color: var(--color-accent);
  text-decoration: none;
}

.apk-help-text a:hover {
  text-decoration: underline;
}

/* Features Grid */
.features {
  background: white;
  margin: var(--spacing-2xl) 0;
  border-radius: 1rem;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  font-size: 2rem;
  color: var(--color-text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--spacing-lg);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
  border-color: var(--color-accent);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.feature-card p {
  font-size: 0.95rem;
  margin: 0;
}

/* How to Play */
.how-to-play {
  background: var(--color-card);
  border-radius: 1rem;
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.step {
  position: relative;
  padding-left: var(--spacing-xl);
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--color-accent), #c9804a);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.step h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.step p {
  font-size: 0.95rem;
  margin: 0;
}

/* APK Installation Guide */
.apk-install-guide {
  background: white;
  border-radius: 1rem;
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.install-step {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-xl);
}

.install-step .step-number {
  position: absolute;
  left: 1.5rem;
  top: 1.5rem;
  width: 2.2rem;
  height: 2.2rem;
  font-size: 1.1rem;
}

.install-step h3 {
  font-size: 1.05rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.install-step p {
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.install-step ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.install-step li {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.6;
}

.install-step li:last-child {
  margin-bottom: 0;
}

/* FAQ */
.faq {
  background: white;
  border-radius: 1rem;
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.faq-item {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.faq-question {
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-toggle {
  font-size: 1.25rem;
  transition: var(--transition);
  width: 24px;
  text-align: center;
}

.faq-item.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.8;
  animation: slideDown 0.3s ease-out;
}

.faq-item.active .faq-answer {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Contact */
.contact {
  background: var(--color-card);
  border-radius: 1rem;
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  text-align: center;
  border: 1px solid var(--color-border);
}

.contact h3 {
  margin-bottom: var(--spacing-md);
}

.contact-email {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.contact-info {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* Footer */
footer {
  background: rgba(255, 251, 245, 0.6);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  font-size: 0.9rem;
}

.footer-section h4 {
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-text-secondary);
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-secondary);
}

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

/* Ink Brush SVG */
.ink-brush {
  opacity: 0.15;
  position: absolute;
  pointer-events: none;
}

/* Legal Pages */
.legal-content {
  background: white;
  border-radius: 1rem;
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.legal-content h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
  color: var(--color-text-primary);
}

.legal-content h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-size: 1.1rem;
  color: var(--color-text-primary);
}

.legal-content p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.legal-content ul,
.legal-content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.legal-content li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.8;
}

.last-updated {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: var(--spacing-xl);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    padding: var(--spacing-md);
    gap: var(--spacing-md);
  }

  .nav-logo {
    font-size: 1.25rem;
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .nav-links a {
    font-size: 0.85rem;
  }

  section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1rem;
  }

  .hero .description {
    font-size: 0.9rem;
  }

  .features {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .feature-card {
    padding: var(--spacing-md);
  }

  .how-to-play {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .install-steps {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .section-title {
    font-size: 1.5rem;
  }

  .faq {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .apk-install-guide {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .legal-content {
    padding: var(--spacing-xl) var(--spacing-md);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }

  .nav-logo {
    font-size: 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero .tagline {
    font-size: 0.9rem;
  }

  .btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.85rem;
  }

  .feature-icon {
    font-size: 2rem;
  }

  .feature-card h3 {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.25rem;
  }

  .step-number {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
  }

  .step {
    padding-left: var(--spacing-lg);
  }

  .install-step .step-number {
    width: 2rem;
    height: 2rem;
    font-size: 0.9rem;
  }

  .download-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .download-section .btn {
    width: 100%;
  }
}