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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  color: #1a1a1a;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.hidden {
  display: none !important;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: #1a1a2e;
  color: #fff;
  border: 1px solid #1a1a2e;
}

.btn-primary:hover {
  background: #2d2d44;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26, 26, 46, 0.2);
}

.btn-outline {
  background: transparent;
  color: #1a1a2e;
  border: 1px solid #d9d9d9;
}

.btn-outline:hover {
  border-color: #1a1a2e;
  background: rgba(26, 26, 46, 0.04);
}

.btn-large {
  padding: 12px 32px;
  font-size: 16px;
  border-radius: 10px;
}

.btn-block {
  width: 100%;
  padding: 12px;
  font-size: 15px;
}

.btn-wechat {
  background: #07c160;
  color: #fff;
  border: 1px solid #07c160;
}

.btn-wechat:hover {
  background: #06ad56;
}

.btn-text {
  background: none;
  color: #666;
  font-size: 13px;
  padding: 8px;
}

.btn-text:hover {
  color: #1a1a2e;
}

/* ========== 顶部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
}

.header-inner {
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: #1a1a2e;
}

.logo-img {
  height: 28px;
  width: auto;
  display: block;
}

.footer-brand .logo-img {
  height: 24px;
}

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

.nav-link {
  font-size: 14px;
  color: #4a4a4a;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-link:hover {
  color: #1a1a2e;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: #1a1a2e;
  transition: width 0.2s;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.login-btns {
  display: flex;
  gap: 8px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  position: relative;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s;
}

.user-info:hover {
  background: rgba(0, 0, 0, 0.04);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #f0f0f0;
}

.user-name {
  font-size: 14px;
  font-weight: 500;
  color: #1a1a2e;
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  padding: 8px 0;
  min-width: 120px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.2s;
}

.user-info:hover .user-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: #4a4a4a;
  transition: background 0.2s;
}

.user-dropdown a:hover {
  background: #f5f5f5;
  color: #1a1a2e;
}

/* 下拉菜单账号信息 */
.dropdown-user-info {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dropdown-user-name {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a2e;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dropdown-user-id {
  font-size: 12px;
  color: #999;
  font-family: 'SF Mono', Monaco, monospace;
  letter-spacing: 0.3px;
}

.dropdown-divider {
  height: 1px;
  background: #f0f0f0;
  margin: 4px 0;
}

.mobile-menu-btn {
  display: none;
  font-size: 24px;
  padding: 4px;
  color: #1a1a2e;
}

/* ========== 移动端菜单 ========== */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid #f0f0f0;
  padding: 16px 24px;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.mobile-menu.active {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-menu a {
  font-size: 16px;
  font-weight: 500;
  color: #1a1a2e;
  padding: 8px 0;
}

.mobile-menu-actions {
  padding-top: 12px;
  border-top: 1px solid #f0f0f0;
}

/* ========== 英雄区 ========== */
.hero {
  position: relative;
  padding: 140px 24px 80px;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(79, 172, 254, 0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(0, 242, 254, 0.1) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  background: linear-gradient(135deg, #fff 0%, #a8d8ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 40px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
}

.hero-actions .btn-outline {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}

.hero-actions .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  gap: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.stat-num {
  font-size: 36px;
  font-weight: 700;
  color: #4facfe;
}

.stat-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

/* ========== 产品服务 ========== */
.products {
  padding: 80px 24px;
  background: #f8f9fa;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: #666;
}

.products-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.product-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #4facfe, #00f2fe);
  opacity: 0;
  transition: opacity 0.3s;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  border-color: rgba(79, 172, 254, 0.2);
}

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

.product-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  overflow: hidden;
}

.product-icon-text {
  font-size: 28px;
  line-height: 1;
}

.product-logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.product-name {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 8px;
}

.product-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  margin-bottom: 20px;
}

.product-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.product-tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  background: #f0f4ff;
  color: #4facfe;
  font-weight: 500;
}

.product-arrow {
  position: absolute;
  right: 24px;
  bottom: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #f0f4ff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4facfe;
  font-size: 18px;
  transition: all 0.2s;
}

.product-card:hover .product-arrow {
  background: #4facfe;
  color: #fff;
}

/* ========== 合作伙伴 ========== */
.partners {
  padding: 80px 24px;
  background: #fff;
}

.partners-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  justify-content: center;
}

.partner-card {
  background: #fff;
  border: 1px solid #f0f0f0;
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 140px;
}

.partner-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  border-color: rgba(79, 172, 254, 0.3);
}

.partner-logo-img {
  max-height: 36px;
  max-width: 180px;
  width: auto;
  object-fit: contain;
}

/* ========== 关于我们 ========== */
.about {
  padding: 80px 24px;
  background: #fff;
}

.about-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-text {
  font-size: 16px;
  color: #4a4a4a;
  line-height: 1.8;
  margin-bottom: 48px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.about-feature {
  text-align: center;
  padding: 32px 24px;
  border-radius: 16px;
  background: #f8f9fa;
  transition: all 0.3s;
}

.about-feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  font-size: 40px;
  margin-bottom: 16px;
  display: block;
}

.about-feature h4 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 8px;
}

.about-feature p {
  font-size: 14px;
  color: #666;
}

/* ========== 底部 ========== */
.footer {
  background: #1a1a2e;
  color: #fff;
  padding: 60px 24px 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  flex-shrink: 0;
}



.footer-brand .logo-text {
  font-size: 24px;
  font-weight: 700;
}

.footer-desc {
  margin-top: 12px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 12px;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  padding: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ========== 登录弹窗（bigmodel.cn 风格） ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

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

/* 宽版登录弹窗 */
.login-modal-wide {
  background: #fff;
  border-radius: 20px;
  width: 100%;
  max-width: 720px;
  padding: 0;
  position: relative;
  animation: modalIn 0.3s ease;
  overflow: hidden;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.login-modal-wide .modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #999;
  transition: all 0.2s;
  z-index: 10;
  background: none;
}

.login-modal-wide .modal-close:hover {
  background: #f5f5f5;
  color: #1a1a2e;
}

/* 弹窗标题区 */
.login-modal-header {
  text-align: center;
  padding: 32px 40px 0;
}

.login-modal-header h3 {
  font-size: 20px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 6px;
}

.login-modal-header p {
  font-size: 13px;
  color: #999;
}

/* 弹窗主体：左右分栏 */
.login-modal-body {
  display: flex;
  padding: 24px 40px 40px;
  gap: 32px;
}

/* 左侧 */
.login-left {
  flex: 1;
  min-width: 0;
}

/* Tab 切换 */
.login-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid #f0f0f0;
  margin-bottom: 20px;
}

.login-tab {
  flex: 1;
  padding: 10px 0;
  font-size: 15px;
  font-weight: 500;
  color: #666;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.login-tab:hover {
  color: #1a1a2e;
}

.login-tab.active {
  color: #1a1a2e;
  border-bottom-color: #1a1a2e;
  font-weight: 600;
}

/* Tab 面板 */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* 表单 */
.form-group {
  margin-bottom: 14px;
}

.form-input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  font-size: 14px;
  transition: all 0.2s;
  outline: none;
}

.form-input:focus {
  border-color: #4facfe;
  box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
}

.form-input::placeholder {
  color: #bbb;
}

.form-input[readonly] {
  background: #f8f8f8;
  color: #666;
}

/* 验证码行 */
.code-row {
  display: flex;
  gap: 10px;
}

.code-row .form-input {
  flex: 1;
}

.btn-send-code {
  white-space: nowrap;
  padding: 0 14px;
  font-size: 13px;
  min-width: 100px;
}

.btn-send-code.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* 错误提示 */
.form-error {
  color: #ff4d4f;
  font-size: 13px;
  margin-bottom: 12px;
  min-height: 20px;
}

.form-error.success {
  color: #52c41a;
}

.form-error.info {
  color: #4facfe;
}

/* 表单行（记住我 + 忘记密码） */
.form-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  font-size: 13px;
}

.forgot-link {
  color: #4facfe;
  transition: color 0.2s;
}

.forgot-link:hover {
  color: #1a1a2e;
}

/* 协议勾选 */
.agreement-row {
  margin-bottom: 14px;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: #666;
  line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.check-box {
  width: 16px;
  height: 16px;
  border: 1px solid #d9d9d9;
  border-radius: 3px;
  flex-shrink: 0;
  margin-top: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.checkbox-label input[type="checkbox"]:checked + .check-box {
  background: #1a1a2e;
  border-color: #1a1a2e;
}

.checkbox-label input[type="checkbox"]:checked + .check-box::after {
  content: '✓';
  color: #fff;
  font-size: 11px;
}

.agreement-text a {
  color: #4facfe;
}

.agreement-text a:hover {
  color: #1a1a2e;
}

.remember-me {
  align-items: center;
}

.remember-me .check-box {
  margin-top: 0;
}

/* 返回按钮 */
.panel-back {
  margin-bottom: 14px;
  font-size: 13px;
}

.panel-back a {
  color: #666;
  transition: color 0.2s;
}

.panel-back a:hover {
  color: #1a1a2e;
}

.bind-tip {
  font-size: 13px;
  color: #666;
  margin-bottom: 14px;
  padding: 8px 12px;
  background: #f8f9fa;
  border-radius: 8px;
}

/* 右侧：微信二维码 */
.login-right {
  width: 200px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-left: 1px solid #f0f0f0;
  padding-left: 32px;
}

.wechat-qrcode-section {
  text-align: center;
  width: 100%;
}

.qrcode-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: #1a1a2e;
  margin-bottom: 16px;
}

.wechat-icon-svg {
  font-size: 18px;
}

.qrcode-img {
  width: 180px;
  height: 180px;
  margin: 0 auto 12px;
  background: #f5f5f5;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.qrcode-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.qrcode-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #999;
  gap: 8px;
}

.wechat-icon-big {
  font-size: 48px;
}

.qrcode-placeholder p {
  font-size: 12px;
}

.qrcode-actions {
  margin-bottom: 8px;
}

.qrcode-status {
  font-size: 12px;
  color: #999;
}

/* 微信选择弹窗 */
.wechat-choice-modal {
  background: #fff;
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  padding: 0;
  position: relative;
  animation: modalIn 0.3s ease;
  overflow: hidden;
}

.wechat-choice-modal .modal-close,
.wechat-bind-login-modal .modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #999;
  transition: all 0.2s;
  z-index: 10;
  background: none;
  border: none;
  cursor: pointer;
}

.wechat-choice-modal .modal-close:hover,
.wechat-bind-login-modal .modal-close:hover {
  background: #f5f5f5;
  color: #1a1a2e;
}

.wechat-choice-content {
  padding: 40px 32px 32px;
  text-align: center;
}

.wechat-choice-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.wechat-choice-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 8px;
}

.wechat-choice-desc {
  font-size: 13px;
  color: #999;
  margin-bottom: 24px;
}

.wechat-choice-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.wechat-choice-buttons .btn {
  padding: 14px 20px;
  border-radius: 10px;
  font-size: 14px;
  flex-direction: column;
  gap: 2px;
  height: auto;
}

.choice-btn-title {
  font-weight: 500;
  font-size: 14px;
}

.choice-btn-desc {
  font-weight: 400;
  font-size: 12px;
  opacity: 0.8;
}

.wechat-choice-buttons .btn-outline {
  border: 1px solid #e0e0e0;
  color: #1a1a2e;
  background: #fff;
}

.wechat-choice-buttons .btn-outline:hover {
  border-color: #07C160;
  color: #07C160;
  background: #f6ffed;
}

.wechat-choice-buttons .btn-text {
  color: #999;
  background: none;
  padding: 10px;
}

.wechat-choice-buttons .btn-text:hover {
  color: #666;
}

/* 微信绑定 - 已有账号登录弹窗 */
.wechat-bind-login-modal {
  background: #fff;
  border-radius: 16px;
  width: 100%;
  max-width: 380px;
  padding: 0;
  position: relative;
  animation: modalIn 0.3s ease;
  overflow: hidden;
}

.wechat-bind-login-content {
  padding: 40px 32px 32px;
}

.wechat-bind-login-header {
  text-align: center;
  margin-bottom: 24px;
}

.wechat-bind-login-icon {
  font-size: 40px;
  margin-bottom: 12px;
  display: block;
}

.wechat-bind-login-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 6px;
}

.wechat-bind-login-header p {
  font-size: 13px;
  color: #999;
}

.wechat-bind-login-content .form-error {
  margin-bottom: 12px;
  text-align: center;
}

.wechat-bind-login-content .form-group {
  margin-bottom: 16px;
}

.wechat-bind-login-content .btn-primary {
  margin-top: 8px;
  margin-bottom: 12px;
}

/* 协议弹窗 */
.agreement-modal {
  max-width: 560px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 32px;
}

.agreement-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 16px;
}

.agreement-content p {
  font-size: 14px;
  color: #666;
  line-height: 1.8;
  margin-bottom: 12px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 120px 16px 60px;
  }

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

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

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

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

  .hero-stats {
    gap: 32px;
  }

  .stat-num {
    font-size: 28px;
  }

  .products {
    padding: 60px 16px;
  }

  .section-title {
    font-size: 26px;
  }

  .products-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .product-card {
    padding: 24px;
  }

  .partners {
    padding: 60px 16px;
  }

  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .partner-card {
    padding: 24px 16px;
    min-height: 120px;
  }

  .partner-logo-img {
    max-height: 36px;
    max-width: 120px;
  }

  .about {
    padding: 60px 16px;
  }

  .about-features {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 32px;
  }

  .footer-links {
    gap: 32px;
    flex-wrap: wrap;
  }

  /* 登录弹窗移动端适配 */
  .login-modal-wide {
    max-width: 100%;
    margin: 16px;
  }

  .login-modal-body {
    flex-direction: column;
    padding: 20px 24px 32px;
    gap: 24px;
  }

  .login-right {
    width: 100%;
    border-left: none;
    border-top: 1px solid #f0f0f0;
    padding-left: 0;
    padding-top: 24px;
  }

  .qrcode-img {
    width: 160px;
    height: 160px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

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

  .stat-label {
    font-size: 12px;
  }

  .footer-links {
    flex-direction: column;
    gap: 24px;
  }
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #d9d9d9;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #bbb;
}