/* ============================================
   糖小影 App 介绍页样式
   ============================================ */

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333333;
  background: #FFF9F5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ===== 变量 ===== */
:root {
  --primary: #FF6B6B;
  --primary-light: #FF8E8E;
  --primary-dark: #E55555;
  --gold: #FFD93D;
  --dark: #2D2D2D;
  --bg: #FFF9F5;
  --bg-white: #FFFFFF;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border: #F0E8E0;
  --shadow-sm: 0 2px 8px rgba(255, 107, 107, 0.08);
  --shadow-md: 0 8px 24px rgba(255, 107, 107, 0.12);
  --shadow-lg: 0 16px 48px rgba(255, 107, 107, 0.16);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --transition: all 0.3s ease-out;
}

/* ===== 通用容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 按钮样式 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 999px;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-small {
  padding: 10px 22px;
  font-size: 14px;
}

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-primary {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 107, 107, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 107, 0.5);
}

.btn-secondary {
  background: rgba(45, 45, 45, 0.06);
  color: var(--dark);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(45, 45, 45, 0.1);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
  padding: 14px 32px;
  font-size: 15px;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-light {
  background: #fff;
  color: var(--primary);
}

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.btn-white {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-white:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* ===== 通用 Section 标题 ===== */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1) 0%, rgba(255, 217, 61, 0.1) 100%);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.text-gradient {
  background: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 动画 ===== */
.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards !important;
}

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

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
  padding: 16px 0;
}

.navbar.scrolled {
  background: rgba(255, 249, 245, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(255, 107, 107, 0.08);
  padding: 12px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  display: block;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #FF6B6B, #FFD93D);
  transition: var(--transition);
  transform: translateX(-50%);
}

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

.nav-cta {
  display: block;
}

.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.nav-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(255, 249, 245, 0.98);
  backdrop-filter: blur(20px);
  padding: 20px;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 4px 20px rgba(255, 107, 107, 0.1);
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  padding: 14px 16px;
  font-size: 16px;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.mobile-menu a:hover {
  background: rgba(255, 107, 107, 0.08);
  color: var(--primary);
}

.mobile-menu-cta {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
  color: #fff !important;
  text-align: center;
  margin-top: 8px;
  font-weight: 600;
}

.mobile-menu-cta:hover {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
  color: #fff !important;
}

/* ===== Hero 区域 ===== */
.hero {
  position: relative;
  padding: 140px 0 80px;
  background: linear-gradient(180deg, #FFF5F0 0%, #FFF9F5 60%, #FFF9F5 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 100px;
  left: -150px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 217, 61, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 107, 107, 0.1);
  border-radius: 999px;
  margin-bottom: 28px;
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

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

.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--dark);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Hero 视觉区 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.phone-mockup {
  position: relative;
  width: 280px;
}

.phone-frame {
  position: relative;
  background: #2D2D2D;
  border-radius: 40px;
  padding: 12px;
  box-shadow: 0 30px 80px rgba(255, 107, 107, 0.25);
  transform: perspective(1000px) rotateY(-8deg) rotateX(4deg);
  transition: transform 0.6s ease-out;
}

.phone-frame:hover {
  transform: perspective(1000px) rotateY(-3deg) rotateX(2deg);
}

.phone-notch {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 90px;
  height: 28px;
  background: #2D2D2D;
  border-radius: 20px;
  z-index: 2;
}

.phone-screen {
  background: #FFF9F5;
  border-radius: 30px;
  overflow: hidden;
  aspect-ratio: 9 / 19.5;
}

.app-preview {
  padding: 56px 16px 16px;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.app-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.app-user {
  flex: 1;
}

.app-username {
  font-size: 12px;
  font-weight: 600;
  color: var(--dark);
}

.app-time {
  font-size: 10px;
  color: var(--text-muted);
}

.app-image-placeholder {
  flex: 1;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 12px;
  position: relative;
  background: #f5f0eb;
}

.app-image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.app-caption {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.phone-glow {
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 60px;
  background: radial-gradient(ellipse, rgba(255, 107, 107, 0.3) 0%, transparent 70%);
  filter: blur(20px);
  z-index: -1;
}

/* 浮动卡片 */
.floating-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  animation: float 4s ease-in-out infinite;
}

.floating-card span:first-child {
  font-size: 24px;
}

.card-1 {
  top: 20%;
  left: -20px;
  animation-delay: 0s;
}

.card-2 {
  top: 45%;
  right: -30px;
  animation-delay: 1s;
}

.card-3 {
  bottom: 15%;
  left: 0;
  animation-delay: 2s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  line-height: 0;
}

.hero-wave svg {
  width: 100%;
  height: 80px;
}

/* ===== 功能特色 ===== */
.features {
  padding: 100px 0;
  background: #FFF9F5;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #FF6B6B, #FFD93D);
  transform: scaleX(0);
  transition: transform 0.4s ease-out;
  transform-origin: left;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.icon-primary {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.15) 0%, rgba(255, 107, 107, 0.05) 100%);
  color: var(--primary);
}

.icon-gold {
  background: linear-gradient(135deg, rgba(255, 217, 61, 0.2) 0%, rgba(255, 217, 61, 0.05) 100%);
  color: #E6A817;
}

.icon-dark {
  background: linear-gradient(135deg, rgba(45, 45, 45, 0.1) 0%, rgba(45, 45, 45, 0.02) 100%);
  color: var(--dark);
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 作品展示 ===== */
.gallery {
  padding: 100px 0;
  background: linear-gradient(180deg, #FFF9F5 0%, #FFF5F0 100%);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 200px;
  gap: 20px;
  margin-bottom: 48px;
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.gallery-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.gallery-item-large {
  grid-row: span 2;
  grid-column: span 2;
}

.gallery-item-wide {
  grid-column: span 2;
}

.gallery-placeholder {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  background: #f0ebe6;
}

.gallery-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease-out;
}

.gallery-item:hover .gallery-placeholder img {
  transform: scale(1.05);
}

.gallery-placeholder span {
  position: absolute;
  bottom: 36px;
  left: 20px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.5px;
  z-index: 2;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.gallery-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.4) 100%);
  pointer-events: none;
  z-index: 1;
}

.gallery-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 2;
}

.gallery-user {
  font-size: 13px;
  color: #fff;
  font-weight: 500;
}

.gallery-likes {
  font-size: 13px;
  color: #fff;
}

.gallery-more {
  text-align: center;
}

/* ===== 关于我们 ===== */
.about {
  padding: 100px 0;
  background: #fff;
}

.about-wrap {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-card {
  background: linear-gradient(135deg, #FFF5F0 0%, #FFF9F5 100%);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  text-align: center;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.about-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 217, 61, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.about-icon-main {
  width: 80px;
  height: 80px;
  margin: 0 auto 32px;
  background: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 100%);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
  z-index: 1;
  box-shadow: 0 8px 24px rgba(255, 107, 107, 0.3);
}

.about-icon-main svg {
  width: 48px;
  height: 48px;
}

.about-stats-row {
  display: flex;
  justify-content: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.about-stat-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--dark);
  background: linear-gradient(135deg, #FF6B6B, #FFD93D);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

.about-content .section-tag {
  margin-bottom: 16px;
}

.about-content .section-title {
  text-align: left;
  font-size: 36px;
  margin-bottom: 20px;
}

.about-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-values {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.value-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 500;
}

.value-dot {
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, #FF6B6B, #FFD93D);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ===== 下载区域 ===== */
.download-section {
  padding: 80px 0;
  background: #FFF9F5;
}

.download-card {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 50%, #FFD93D 100%);
  border-radius: var(--radius-xl);
  padding: 64px;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.download-card::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.download-card::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: 10%;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.download-content {
  position: relative;
  z-index: 1;
}

.download-content h2 {
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.download-content p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 32px;
}

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

.download-visual {
  display: flex;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.qr-placeholder {
  background: #fff;
  padding: 20px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.qr-placeholder img {
  width: 140px;
  height: 140px;
  display: block;
  margin: 0 auto 12px;
  border-radius: 8px;
}

.qr-placeholder p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 0;
  font-weight: 500;
}

/* ===== 联系我们 ===== */
.contact {
  padding: 100px 0;
  background: #fff;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.contact-card {
  background: #FFF9F5;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  background: #fff;
}

.contact-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1) 0%, rgba(255, 217, 61, 0.1) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.contact-icon svg {
  width: 28px;
  height: 28px;
}

.contact-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
  background: #2D2D2D;
  color: #999;
  padding: 64px 0 24px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 60px;
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand .logo-icon {
  background: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 100%);
}

.footer-brand .logo-text {
  color: #fff;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: #999;
  max-width: 320px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: #999;
  margin-bottom: 12px;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy p {
  font-size: 13px;
  color: #777;
}

.footer-icp a {
  font-size: 13px;
  color: #999;
  transition: var(--transition);
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 44px;
  }

  .section-title {
    font-size: 32px;
  }

  .hero-container {
    gap: 40px;
  }

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

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .gallery-item-large {
    grid-column: span 2;
  }

  .download-card {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

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

@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-menu-btn {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-container {
    grid-template-columns: 1fr;
    gap: 60px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 24px;
  }

  .phone-mockup {
    width: 220px;
  }

  .floating-card {
    padding: 10px 14px;
    font-size: 12px;
  }

  .floating-card span:first-child {
    font-size: 18px;
  }

  .section-title {
    font-size: 28px;
  }

  .section-desc {
    font-size: 15px;
  }

  .features,
  .gallery,
  .about,
  .contact {
    padding: 64px 0;
  }

  .features-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card,
  .contact-card {
    padding: 32px 24px;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 160px;
    gap: 12px;
  }

  .gallery-item-large {
    grid-column: span 2;
    grid-row: span 1;
  }

  .gallery-item-wide {
    grid-column: span 2;
  }

  .about-wrap {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-content .section-title {
    font-size: 28px;
  }

  .about-card {
    padding: 36px 28px;
  }

  .download-section {
    padding: 64px 0;
  }

  .download-card {
    padding: 40px 28px;
    border-radius: 24px;
  }

  .download-content h2 {
    font-size: 28px;
  }

  .download-content p {
    font-size: 15px;
  }

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

  .footer-main {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 30px;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
  }

  .stat-divider {
    display: none;
  }

  .section-title {
    font-size: 24px;
  }

  .gallery-grid {
    grid-auto-rows: 140px;
  }

  .gallery-camera {
    width: 36px;
    height: 36px;
  }

  .gallery-placeholder span {
    font-size: 13px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}