/* 
 * Xiaohongshu (Little Red Book) Style Theme
 * Author: Dengfeng Liu
 */

:root {
  /* Brand Colors */
  --xhs-red: #ff2442;
  --xhs-red-hover: #e01e3a;
  --xhs-bg: #f8f8f8;
  --xhs-card-bg: #ffffff;
  --xhs-text-primary: #333333;
  --xhs-text-secondary: #666666;
  --xhs-text-tertiary: #999999;
  --xhs-border: #f0f0f0;
  
  /* Spacing & Radius */
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  
  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-float: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  margin: 0;
  background-color: var(--xhs-bg);
  color: var(--xhs-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
  padding: 12px 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-area img {
  height: 40px;
  width: 40px;
  border-radius: 50%;
}

.logo-area h1 {
  font-size: 18px;
  margin: 0;
  font-weight: 600;
  color: var(--xhs-text-primary);
}

.header-actions .btn {
  padding: 8px 20px;
  font-size: 14px;
}

/* Main Content */
main {
  padding: 40px 0;
}

/* Hero Section */
.hero-section {
  background: var(--xhs-card-bg);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  margin-bottom: 40px;
  box-shadow: var(--shadow-card);
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--xhs-text-primary);
}

.hero-desc {
  font-size: 18px;
  color: var(--xhs-text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

/* Cards Grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* Feature Card */
.feature-card {
  background: var(--xhs-card-bg);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 1px solid var(--xhs-border);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
  display: block;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.feature-card p {
  margin: 0;
  color: var(--xhs-text-secondary);
  font-size: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  outline: none;
}

.btn.primary {
  background: var(--xhs-red);
  color: white;
  padding: 12px 32px;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(255, 36, 66, 0.2);
}

.btn.primary:hover {
  background: var(--xhs-red-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(255, 36, 66, 0.3);
}

.btn.secondary {
  background: #f5f5f5;
  color: var(--xhs-text-secondary);
  padding: 12px 24px;
}

.btn.secondary:hover {
  background: #eeeeee;
  color: var(--xhs-text-primary);
}

.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: #f0f0f0;
  color: #ccc;
  box-shadow: none;
}

/* Section Styles */
section {
  margin-bottom: 60px;
}

section h2 {
  font-size: 24px;
  margin-bottom: 24px;
  text-align: center;
  position: relative;
  display: inline-block;
  width: 100%;
}

/* Video Container */
.video-wrapper {
  background: var(--xhs-card-bg);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
  max-width: 800px;
  margin: 0 auto;
}

video {
  width: 100%;
  border-radius: var(--radius-md);
  display: block;
}

/* Screenshots */
.screenshot-gallery {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.screenshot-card {
  background: var(--xhs-card-bg);
  padding: 12px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 400px;
}

.screenshot-card img {
  width: 100%;
  border-radius: var(--radius-sm);
  display: block;
}

/* Steps */
.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

.step-item {
  position: relative;
  padding-left: 50px;
  margin-bottom: 20px;
}

.step-item::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  background: var(--xhs-red);
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 32px;
  font-weight: bold;
  font-size: 14px;
}

.step-title {
  font-weight: 600;
  margin-bottom: 4px;
  display: block;
  color: var(--xhs-text-primary);
}

.step-desc {
  color: var(--xhs-text-secondary);
  font-size: 14px;
}

/* Footer */
footer {
  background: var(--xhs-card-bg);
  padding: 40px 0;
  margin-top: 60px;
  border-top: 1px solid var(--xhs-border);
  text-align: center;
  color: var(--xhs-text-tertiary);
  font-size: 12px;
}

.footer-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: white;
  border-radius: 24px;
  padding: 40px;
  width: 90%;
  max-width: 440px;
  text-align: center;
  position: relative;
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #666;
  transition: all 0.2s;
}

.modal-close:hover {
  background: #eee;
  color: #333;
}

.qr-box {
  background: #fff5f7;
  border: 2px solid var(--xhs-red);
  border-radius: 16px;
  padding: 20px;
  margin: 24px 0;
}

.qr-box img {
  width: 100%;
  max-width: 200px;
  border-radius: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: 40px 20px;
  }
  
  .hero-title {
    font-size: 24px;
  }
  
  .header-content {
    padding: 0 16px;
  }
}