/* --- Paper Cut Collage Theme --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=ZCOOL+KuaiLe&display=swap');

:root {
  --bg-color: #fdf8f0; /* Light beige paper */
  --paper-color: #ffffff;
  --text-color: #2c2c2c;
  --primary-color: #4285F4; /* Google Blue */
  --accent-red: #DB4437;
  --accent-yellow: #F4B400;
  --accent-green: #0F9D58;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --heavy-shadow-color: rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: 'Noto Sans SC', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--primary-color); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Header & Navigation --- */
.main-header {
  background: var(--paper-color);
  box-shadow: 0 4px 12px var(--shadow-color);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.main-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  font-family: 'ZCOOL KuaiLe', sans-serif;
  font-size: 24px;
  font-weight: bold;
}

.logo svg { width: 32px; height: 32px; margin-right: 10px; }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 30px;
}

.main-nav a {
  color: var(--text-color);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 3px solid transparent;
  transition: border-color 0.3s;
}

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

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: bold;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
  box-shadow: 0 4px 15px rgba(66, 133, 244, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(66, 133, 244, 0.5); }

.btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}
.btn-secondary:hover { background-color: var(--primary-color); color: #fff; }

.btn-lg { font-size: 18px; padding: 15px 35px; }

/* --- General Layout & Paper Effect --- */
.paper-layer {
  background-color: var(--paper-color);
  border-radius: 16px;
  box-shadow: 5px 5px 20px var(--shadow-color);
  padding: 40px;
  margin-bottom: 30px;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 15px;
}

.section-subtitle {
  font-size: 18px;
  text-align: center;
  color: #666;
  max-width: 600px;
  margin: 0 auto 60px auto;
}

/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: 100px 0;
}

.hero-title {
  font-family: 'ZCOOL KuaiLe', sans-serif;
  font-size: 64px;
  font-weight: 400;
  color: var(--primary-color);
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 20px;
  max-width: 700px;
  margin: 0 auto 40px auto;
  color: #555;
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: var(--paper-color);
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  box-shadow: 3px 3px 15px var(--shadow-color);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 8px 8px 25px var(--heavy-shadow-color);
}

.feature-icon {
  height: 60px;
  margin-bottom: 20px;
}

.feature-icon svg { width: 60px; height: 60px; }

.feature-title { font-size: 22px; margin-bottom: 10px; }
.feature-desc { font-size: 15px; color: #666; }

/* --- Platforms Section --- */
.platforms-grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.platform-card {
  background: var(--paper-color);
  border-radius: 12px;
  padding: 25px;
  width: 250px;
  text-align: center;
  box-shadow: 3px 3px 15px var(--shadow-color);
}

.platform-icon { height: 48px; margin-bottom: 15px; }
.platform-icon svg { width: 48px; height: 48px; }
.platform-name { font-size: 20px; font-weight: 500; margin-bottom: 15px; }
.platform-desc { font-size: 14px; color: #777; margin-bottom: 20px; min-height: 40px; }

/* --- Detailed Features --- */
.detailed-feature {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-bottom: 80px;
}

.detailed-feature:nth-child(even) { flex-direction: row-reverse; }

.detailed-feature-text { flex: 1; }
.detailed-feature-img { flex: 1; text-align: center; }
.detailed-feature-img img { max-width: 100%; border-radius: 8px; box-shadow: 5px 5px 20px var(--shadow-color); }

.detailed-feature-title { font-size: 28px; margin-bottom: 15px; font-weight: 700; }

/* --- Reviews Section --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.review-card {
  background: var(--paper-color);
  border-radius: 12px;
  padding: 25px;
  box-shadow: 3px 3px 15px var(--shadow-color);
}

.review-header {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
}

.review-avatar { width: 50px; height: 50px; border-radius: 50%; background: #eee; margin-right: 15px; display: flex; align-items: center; justify-content: center; font-weight: bold; }
.review-name { font-weight: bold; }
.review-stars { color: var(--accent-yellow); margin-top: 2px; }
.review-text { font-style: italic; color: #555; }

/* --- Stats Section --- */
.stats-grid {
  display: flex;
  justify-content: space-around;
  text-align: center;
  flex-wrap: wrap;
  gap: 20px;
}

.stat-item { background: var(--paper-color); padding: 20px; border-radius: 12px; width: 220px; box-shadow: 3px 3px 15px var(--shadow-color); }
.stat-number { font-size: 48px; font-weight: bold; color: var(--primary-color); }
.stat-label { font-size: 16px; color: #666; }

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
}

.comparison-table th, .comparison-table td {
  padding: 15px;
  border: 1px solid #e0e0e0;
}

.comparison-table th { background-color: #f7f7f7; font-weight: bold; }
.comparison-table .highlight { background-color: #e8f0fe; font-weight: bold; }
.comparison-table .check-mark { color: var(--accent-green); font-size: 24px; font-weight: bold; }

/* --- FAQ Section --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--paper-color); border-radius: 10px; margin-bottom: 15px; box-shadow: 3px 3px 15px var(--shadow-color); overflow: hidden; }
.faq-q { padding: 20px; font-weight: bold; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-q svg { width: 20px; height: 20px; transition: transform 0.3s; }
.faq-a { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.4s ease-out, padding 0.4s ease-out; }
.faq-a p { padding-bottom: 20px; color: #555; }
.faq-item.open .faq-q svg { transform: rotate(45deg); }
.faq-item.open .faq-a { max-height: 300px; }

/* --- Footer --- */
.main-footer {
  background: #f0f0f0;
  color: #777;
  padding: 30px 0;
  text-align: center;
  font-size: 14px;
  margin-top: 80px;
}
.security-line { font-weight: bold; color: #555; margin-bottom: 10px; }

/* --- Download Page Specific --- */
.download-hero {
  padding: 60px 0;
  text-align: center;
}

.download-main-card {
  background: #e8f0fe;
  border: 2px solid var(--primary-color);
}

.install-guide {
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 25px;
  align-items: flex-start;
  margin-bottom: 30px;
}

.step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary-color);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: bold;
  box-shadow: 0 4px 10px rgba(66, 133, 244, 0.4);
}

.step-content h4 { font-size: 20px; margin-bottom: 5px; }
.step-content img { max-width: 100%; border-radius: 8px; margin-top: 15px; box-shadow: 3px 3px 15px var(--shadow-color); }

.version-log .paper-layer { margin-bottom: 20px; }
.version-log h4 { font-size: 20px; }
.version-log span { font-size: 14px; color: #888; margin-left: 10px; }
.version-log ul { list-style-position: inside; padding-left: 10px; margin-top: 10px; color: #555; }

/* --- ZH-CN Page Specific --- */
.article-content { max-width: 800px; margin: 0 auto; }
.article-content h2 { font-size: 28px; margin-top: 40px; margin-bottom: 15px; border-bottom: 2px solid #eee; padding-bottom: 10px; }
.article-content p { margin-bottom: 20px; }
.article-content ul { list-style-position: inside; padding-left: 10px; margin-bottom: 20px; }
.cta-block { text-align: center; padding: 40px; background: #e8f0fe; border-radius: 12px; margin-top: 50px; }
.cta-block h2 { margin: 0 0 15px 0; }

/* --- Utilities & Animations --- */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* --- Animated SVG --- */
.animated-svg-wrapper {
  background-color: #f8f9fa;
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 250px; /* Adjust as needed */
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}

.animated-svg-wrapper svg {
  width: 100%;
  height: 100%;
  max-width: 320px;
}