/* ==================== 重置和基础样式 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 色彩系统 */
  --primary-red: #e63946;
  --primary-red-dark: #a8000f;
  --dark-gray: #2b2d42;
  --light-gray: #f5f5f5;
  --text-dark: #333333;
  --text-white: #ffffff;
  --bg-gray: #f5f5f5;

  /* 间距系统 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;

  /* 过渡动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--text-white);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ==================== 导航栏 ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: transparent;
  transition: background-color var(--transition-normal),
    box-shadow var(--transition-normal);
  animation: slideDown var(--transition-normal);
}

.header.scrolled {
  background-color: var(--dark-gray);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.logo-img {
  height: 40px;
  width: auto;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.logo-img:hover {
  transform: scale(1.05);
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--text-white);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-red);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--primary-red);
}

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

.header-actions {
  display: flex;
  gap: var(--space-sm);
}

.btn {
  padding: 10px 24px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition-normal);
  outline: none;
}

.btn:active {
  transform: scale(0.95);
}

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

.btn-outline:hover {
  background-color: var(--text-white);
  color: var(--primary-red);
}

.btn-primary {
  background-color: var(--primary-red);
  color: var(--text-white);
}

.btn-primary:hover {
  background-color: var(--primary-red-dark);
  transform: scale(1.05);
}

.btn-dark {
  background-color: var(--dark-gray);
  color: var(--text-white);
}

.btn-dark:hover {
  background-color: #1a1c2e;
  transform: scale(1.05);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-white);
  transition: all var(--transition-normal);
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ==================== 主视觉区 ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--dark-gray) 0%, #1a1c2e 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.3;
}

.hero-decoration {
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  animation: fadeInUp var(--transition-slow);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

/* ==================== 核心功能区 ==================== */
.features {
  padding: var(--space-xl) 0;
  background-color: var(--bg-gray);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 1100px;
  margin: 0 auto;
}

.feature-card {
  position: relative;
  background: linear-gradient(
    135deg,
    var(--primary-red) 0%,
    var(--primary-red-dark) 100%
  );
  border-radius: 20px;
  padding: var(--space-lg);
  color: var(--text-white);
  transition: all var(--transition-normal);
  overflow: hidden;
  animation: fadeInUp var(--transition-slow);
  animation-fill-mode: both;
}

.feature-card.card-1 {
  transform: rotate(-2deg);
  animation-delay: 0.1s;
}

.feature-card.card-2 {
  transform: rotate(1deg);
  animation-delay: 0.2s;
}

.feature-card.card-3 {
  transform: rotate(-1deg);
  animation-delay: 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px) rotate(0deg) !important;
  box-shadow: 0 10px 30px rgba(230, 57, 70, 0.3);
}

.card-corner {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 60px;
  height: 60px;
  background: linear-gradient(
    225deg,
    rgba(255, 255, 255, 0.2) 0%,
    transparent 100%
  );
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.card-number {
  font-size: 4rem;
  font-weight: 700;
  opacity: 0.3;
  display: block;
  margin-bottom: var(--space-sm);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card-description {
  font-size: 0.95rem;
  line-height: 1.6;
  opacity: 0.95;
}

/* ==================== 产品展示区 ==================== */
.showcase {
  padding: var(--space-xl) 0;
}

.showcase-deposits {
  background-color: var(--text-white);
}

.showcase-card {
  background-color: var(--dark-gray);
}

.showcase-security {
  background-color: var(--text-white);
}

.showcase-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.showcase-content.reverse {
  direction: rtl;
}

.showcase-content.reverse > * {
  direction: ltr;
}

.showcase-text {
  animation: fadeInUp var(--transition-slow);
}

.showcase-deposits .showcase-text {
  background: linear-gradient(
    135deg,
    var(--primary-red) 0%,
    var(--primary-red-dark) 100%
  );
  padding: var(--space-xl);
  border-radius: 20px;
  color: var(--text-white);
}

.showcase-card .showcase-text {
  color: var(--text-white);
}

.showcase-security .showcase-text {
  background: linear-gradient(
    135deg,
    var(--primary-red) 0%,
    var(--primary-red-dark) 100%
  );
  padding: var(--space-xl);
  border-radius: 20px;
  color: var(--text-white);
}

.showcase-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.showcase-description {
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
  line-height: 1.8;
  opacity: 0.95;
}

.security-features {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.security-features li {
  padding: var(--space-sm) 0;
  padding-left: var(--space-md);
  position: relative;
  font-size: 1.1rem;
}

.security-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--text-white);
  font-weight: 700;
}

.showcase-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeIn var(--transition-slow);
}

.phone-mockup {
  max-width: 300px;
  transition: transform var(--transition-normal);
}

.phone-mockup:hover {
  transform: scale(1.05);
}

.phone-frame {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
}

/* ==================== 常见问题 ==================== */
.faq {
  padding: var(--space-xl) 0;
  background-color: var(--bg-gray);
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  color: var(--text-dark);
}

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

.faq-item {
  background-color: var(--text-white);
  border-radius: 12px;
  margin-bottom: var(--space-md);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: box-shadow var(--transition-normal);
}

.faq-item:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.faq-question {
  width: 100%;
  padding: var(--space-md);
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  transition: color var(--transition-fast);
}

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

.faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition-normal);
  color: var(--primary-red);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(90deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-answer p {
  padding: 0 var(--space-md) var(--space-md);
  color: #666;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ==================== 合作伙伴 ==================== */
.partners {
  padding: var(--space-xl) 0;
  background-color: var(--text-white);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

.partner-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background-color: var(--bg-gray);
  border-radius: 12px;
  transition: transform var(--transition-fast);
}

.partner-logo:hover {
  transform: scale(1.1);
}

/* ==================== 页脚 ==================== */
.footer {
  background-color: var(--dark-gray);
  color: var(--text-white);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-tagline {
  margin-top: var(--space-sm);
  opacity: 0.8;
  font-size: 0.9rem;
}

.footer-heading {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-white);
  text-decoration: none;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

.social-link:hover {
  color: var(--primary-red);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.7;
  font-size: 0.9rem;
}

/* ==================== 动画 ==================== */
@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== 响应式设计 ==================== */

/* 平板设备 (768px - 1023px) */
@media (max-width: 1023px) {
  .hero-title {
    font-size: 2.5rem;
  }

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

  .feature-card {
    transform: rotate(0deg) !important;
  }

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

  .showcase-content.reverse {
    direction: ltr;
  }

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

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

/* 移动设备 (0 - 767px) */
@media (max-width: 767px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 250px;
    height: calc(100vh - 70px);
    background-color: var(--dark-gray);
    padding: var(--space-lg);
    transition: right var(--transition-normal);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    gap: var(--space-md);
  }

  .header-actions {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    min-height: 100vh;
    padding: 100px var(--space-md) var(--space-xl);
  }

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

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

  .showcase {
    padding: var(--space-lg) 0;
  }

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

  .showcase-description {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

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

  .phone-mockup {
    max-width: 250px;
  }
}

/* 超小设备优化 */
@media (max-width: 400px) {
  :root {
    font-size: 14px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .card-number {
    font-size: 3rem;
  }

  .phone-mockup {
    max-width: 200px;
  }
}