/* ============================================
   Depu Multi - Template 02 Download
   德扑圈APP下载官网模板 - 科技感现代风格
   主色：深蓝色 #091320，科技绿 #10b981
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-bg-deep: #091320;
  --color-bg-dark: #0d1b2a;
  --color-bg-card: #112240;
  --color-bg-card-hover: #1a3a5c;
  --color-green: #10b981;
  --color-green-light: #34d399;
  --color-green-glow: rgba(16, 185, 129, 0.3);
  --color-blue: #0ea5e9;
  --color-gradient-start: #0ea5e9;
  --color-gradient-end: #10b981;
  --color-text-primary: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: rgba(16, 185, 129, 0.15);
  --color-border-hover: rgba(16, 185, 129, 0.4);
  --font-main: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg-deep);
  color: var(--color-text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-green-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: #ffffff;
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(16, 185, 129, 0.15));
  border: 1px solid var(--color-border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-green-light);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff, var(--color-green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 48px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(16, 185, 129, 0.45);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--color-green);
  border: 2px solid var(--color-green);
}

.btn-outline:hover {
  background: rgba(16, 185, 129, 0.1);
  transform: translateY(-2px);
  color: var(--color-green-light);
}

.btn-lg {
  padding: 18px 48px;
  font-size: 1.1rem;
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(9, 19, 32, 0.95);
  backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: #ffffff;
}

.nav-logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.nav-logo span {
  background: linear-gradient(135deg, var(--color-green), var(--color-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--color-green), var(--color-blue));
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #ffffff;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-download-btn {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff !important;
  border-radius: 50px;
  font-weight: 600;
}

.nav-download-btn::after {
  display: none !important;
}

.nav-download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
  background: radial-gradient(ellipse at 20% 50%, rgba(14, 165, 233, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 50%, rgba(16, 185, 129, 0.08) 0%, transparent 60%),
              var(--color-bg-deep);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2310b981' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  z-index: 0;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  animation: fadeInUp 0.8s ease;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-green-light);
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--color-green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-green), var(--color-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 480px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-mockup {
  position: relative;
  animation: fadeInRight 0.8s ease;
}

.hero-mockup img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

.hero-mockup::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--color-green-glow), transparent 70%);
  border-radius: 50%;
  z-index: -1;
}

/* ---------- Platform Download Cards ---------- */
.platform-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.platform-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  opacity: 0;
  transition: var(--transition);
}

.platform-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-glow);
}

.platform-card:hover::before {
  opacity: 1;
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(16, 185, 129, 0.15));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.platform-card h3 {
  margin-bottom: 8px;
  font-size: 1.3rem;
}

.platform-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.platform-version {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(16, 185, 129, 0.1);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--color-green-light);
  margin-bottom: 20px;
}

.platform-card .btn {
  width: 100%;
}

/* ---------- Install Steps ---------- */
.install-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.step-card {
  text-align: center;
  position: relative;
  padding: 32px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.step-number {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
}

.step-card h4 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.step-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(16, 185, 129, 0.08));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Page Hero (sub pages) ---------- */
.page-hero {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 60%),
              var(--color-bg-deep);
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2310b981' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  z-index: 0;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.page-hero p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Download Detail Cards (downloads.html) ---------- */
.download-detail-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.download-detail-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.download-detail-card.featured {
  border-color: var(--color-green);
  box-shadow: var(--shadow-glow);
}

.download-detail-card.featured::after {
  content: '推荐';
  position: absolute;
  top: 20px;
  right: -35px;
  background: linear-gradient(135deg, var(--color-green), var(--color-blue));
  color: #ffffff;
  padding: 6px 50px;
  font-size: 0.8rem;
  font-weight: 600;
  transform: rotate(45deg);
}

.download-detail-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
}

.download-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(16, 185, 129, 0.15));
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.download-detail-card h3 {
  margin-bottom: 12px;
  font-size: 1.4rem;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.download-meta span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.download-detail-card .btn {
  margin-top: 24px;
  width: 100%;
}

/* ---------- Install Guide (downloads.html) ---------- */
.install-guide {
  background: var(--color-bg-dark);
}

.guide-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.guide-tab {
  padding: 12px 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

.guide-tab.active,
.guide-tab:hover {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
  border-color: transparent;
}

.guide-content {
  display: none;
}

.guide-content.active {
  display: block;
  animation: fadeInUp 0.5s ease;
}

.guide-steps {
  max-width: 700px;
  margin: 0 auto;
}

.guide-step {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.guide-step:last-child {
  border-bottom: none;
}

.guide-step-num {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
}

.guide-step-content h4 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.guide-step-content p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* ---------- FAQ Page ---------- */
.faq-categories {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.faq-category-btn {
  padding: 10px 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

.faq-category-btn.active,
.faq-category-btn:hover {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
  border-color: transparent;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--color-border-hover);
}

.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: var(--transition);
}

.faq-question h4 {
  font-size: 1.05rem;
  font-weight: 600;
}

.faq-toggle {
  width: 32px;
  height: 32px;
  min-width: 32px;
  background: rgba(16, 185, 129, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1.2rem;
  color: var(--color-green);
}

.faq-item.open .faq-toggle {
  transform: rotate(45deg);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #ffffff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  max-height: 400px;
}

/* ---------- Contact Page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  margin-bottom: 24px;
  transition: var(--transition);
}

.contact-info-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
}

.contact-info-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(16, 185, 129, 0.15));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-info-card h4 {
  margin-bottom: 8px;
}

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

.contact-wechat-qr {
  text-align: center;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.contact-wechat-qr h4 {
  margin-bottom: 16px;
}

.wechat-id {
  display: inline-block;
  padding: 12px 32px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.1), rgba(16, 185, 129, 0.1));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-green-light);
  letter-spacing: 2px;
  margin-top: 16px;
}

.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 36px;
}

.contact-form h3 {
  margin-bottom: 8px;
  font-size: 1.5rem;
}

.contact-form > p {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  background: var(--color-bg-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-main);
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-green);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* ---------- Article Page ---------- */
.article-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 0;
}

.article-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.article-meta span {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-body h2 {
  font-size: 1.6rem;
  margin: 40px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.3rem;
  margin: 32px 0 12px;
}

.article-body p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.9;
}

.article-body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  box-shadow: var(--shadow-card);
}

.article-body ul,
.article-body ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-body ul li,
.article-body ol li {
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  line-height: 1.8;
  list-style: disc;
}

.article-body ol li {
  list-style: decimal;
}

.article-body .tip-box {
  padding: 20px 24px;
  background: rgba(16, 185, 129, 0.08);
  border-left: 4px solid var(--color-green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.article-body .tip-box p {
  margin-bottom: 0;
  color: var(--color-green-light);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer h5 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: #ffffff;
}

.footer-links li {
  margin-bottom: 12px;
}

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

.footer-links a:hover {
  color: var(--color-green);
  padding-left: 4px;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1.1rem;
}

.footer-social a:hover {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-color: transparent;
  transform: translateY(-2px);
}

/* ---------- Floating Customer Service ---------- */
.float-cs {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 9999;
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.float-cs-btn {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-green), var(--color-blue));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
  transition: var(--transition);
  border: none;
  color: #ffffff;
}

.float-cs-btn:hover {
  transform: scale(1.1);
}

.float-cs-panel {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  width: 280px;
  box-shadow: var(--shadow-card);
  transform: translateY(20px);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.float-cs-panel.show {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.float-cs-panel h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.float-cs-panel > p {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.cs-wechat {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.cs-wechat-id {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-green-light);
  letter-spacing: 1px;
}

.cs-wechat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.cs-tip {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 8px;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

.breadcrumb a:hover {
  color: var(--color-green);
}

.breadcrumb .sep {
  color: var(--color-text-muted);
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-mockup {
    max-width: 500px;
    margin: 0 auto;
  }

  .platform-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-detail-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .section-title { font-size: 1.6rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(9, 19, 32, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-top: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .platform-cards {
    grid-template-columns: 1fr;
  }

  .install-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-detail-cards {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

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

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

  .float-cs-panel {
    width: 260px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  section {
    padding: 60px 0;
  }

  .install-steps {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-lg {
    padding: 14px 36px;
    font-size: 1rem;
  }
}