/* ===================== 全局变量 & 重置 ===================== */
:root {
  /* 公司VI色系 - 恢复原色 */
  --blue-dark: #0a2558;
  --blue-primary: #1a4fa0;
  --blue-mid: #2d6fd4;
  --blue-light: #3a7bd5;
  --blue-pale: #e8f0fc;
  --gold: #e8a020;
  --gold-light: #f5c257;
  --text-dark: #1a1a2e;       /* 深色文字 */
  --text-body: #3d4f5f;        /* 正文文字 */
  --text-muted: #7a8a9a;      /* 次要文字 */
  --bg-light: #f5f7fa;         /* 浅色背景 */
  --white: #ffffff;
  --border: #e2e8f0;          /* 边框色 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --transition: 0.25s ease;
  --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text-body);
  background: var(--white);
  overflow-x: hidden;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ===================== 按钮 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  letter-spacing: 0.5px;
}
.btn-primary {
  background: var(--blue-primary);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--blue-mid);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,58,108,0.3);
}
.btn-gold {
  background: var(--gold);
  color: var(--white);
}
.btn-gold:hover {
  background: var(--gold-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(201,162,39,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
}
.btn-full { width: 100%; }

/* ===================== 导航 ===================== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition);
}
#navbar.scrolled {
  background: rgba(10,37,64,0.98);
  backdrop-filter: blur(10px);
  padding: 12px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* LOGO - 固定位置，始终可见 */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-img {
  height: 42px;
  width: auto;
  border-radius: 6px;
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-main {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 1px;
}
.logo-sub {
  font-size: 10px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 40px;
}
.nav-link {
  color: rgba(255,255,255,0.85);
  font-size: 15px;
  font-weight: 400;
  position: relative;
  padding: 4px 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--white);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* 移动端菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition);
}

/* ===================== Hero 区域 ===================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #071a3a 0%, #0c2d5e 40%, #164a96 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.04) 0px, rgba(255,255,255,0.04) 1px, transparent 1px, transparent 80px),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.04) 0px, rgba(255,255,255,0.04) 1px, transparent 1px, transparent 80px);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 120px 32px 80px;
}
.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  color: rgba(255,255,255,0.9);
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 24px;
}
.hero-title .highlight {
  color: var(--gold);
}
.hero-desc {
  font-size: 17px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 40px;
  line-height: 1.8;
}
.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 数字统计 */
.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 80px;
  padding-top: 48px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--gold);
}
.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-top: 4px;
}

/* ===================== 核心优势 ===================== */
.features-bar {
  background: var(--white);
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--blue-pale);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.feature-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
}
.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
}

/* ===================== 通用区块标题 ===================== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-tag {
  font-size: 12px;
  color: var(--blue-mid);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 16px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================== 关于我们 ===================== */
.about {
  padding: 96px 0;
  background: var(--white);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-visual {
  position: relative;
}
.about-img-main {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
  border-radius: 8px;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.about-globe {
  width: 200px;
  height: 200px;
  opacity: 0.6;
}
.about-content {
  padding: 24px 0;
}
.about-subtitle {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 24px;
}
.about-text {
  font-size: 15px;
  color: var(--text-body);
  margin-bottom: 20px;
}
.about-values {
  margin: 32px 0;
}
.value-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}
.value-dot {
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}
.value-item strong {
  color: var(--text-dark);
}

/* ===================== 产品服务 ===================== */
.services {
  padding: 96px 0;
  background: var(--bg-light);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--white);
  border-radius: 8px;
  padding: 32px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
}
.service-card:hover {
  border-color: var(--blue-mid);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.service-card.featured {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
  border: none;
  color: var(--white);
}
.service-card.featured .service-title,
.service-card.featured .service-desc,
.service-card.featured .service-features li {
  color: var(--white);
}
.service-card.featured .service-features li {
  border-color: rgba(255,255,255,0.2);
}
.service-badge {
  position: absolute;
  top: -1px;
  right: 24px;
  background: var(--gold);
  color: var(--white);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 0 0 4px 4px;
}
.service-icon {
  font-size: 32px;
  margin-bottom: 20px;
}
.service-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
}
.service-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}
.service-features {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.service-card.featured .service-features {
  border-color: rgba(255,255,255,0.2);
}
.service-features li {
  font-size: 13px;
  color: var(--text-body);
  padding: 6px 0;
  border-bottom: 1px solid var(--bg-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.service-features li::before {
  content: '✓';
  color: var(--gold);
  font-weight: bold;
}
.service-card.featured .service-features li::before {
  color: var(--gold-light);
}

/* ===================== 合作流程 ===================== */
.process {
  padding: 96px 0;
  background: var(--blue-dark);
}
.process .section-tag { color: var(--gold); }
.process .section-title { color: var(--white); }
.process .section-desc { color: rgba(255,255,255,0.7); }

.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 24px;
}
.process-step {
  flex: 1;
  max-width: 240px;
  text-align: center;
  padding: 32px 24px;
  background: rgba(255,255,255,0.05);
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
}
.step-num {
  font-size: 12px;
  color: var(--gold);
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.step-icon {
  font-size: 36px;
  margin-bottom: 16px;
}
.process-step h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}
.process-step p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}
.process-arrow {
  font-size: 24px;
  color: var(--gold);
  padding-top: 48px;
}

/* ===================== 联系我们 ===================== */
.contact {
  padding: 96px 0;
  background: var(--white);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
}
.contact-info-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 32px;
}
.contact-items {
  margin-bottom: 40px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item-icon {
  width: 44px;
  height: 44px;
  background: var(--blue-pale);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.contact-item-value {
  font-size: 15px;
  color: var(--text-dark);
  font-weight: 500;
}

.contact-social {
  margin-top: 32px;
}
.social-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.social-icons {
  display: flex;
  gap: 12px;
}
.social-icon {
  width: 40px;
  height: 40px;
  background: var(--blue-pale);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-primary);
  cursor: pointer;
  transition: all var(--transition);
}
.social-icon:hover {
  background: var(--blue-primary);
  color: var(--white);
}

/* 联系表单 */
.contact-form-wrap {
  background: var(--bg-light);
  border-radius: 8px;
  padding: 40px;
}
.contact-form-wrap .contact-info-title {
  margin-bottom: 24px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  background: var(--white);
  transition: all var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue-mid);
  box-shadow: 0 0 0 3px rgba(45,90,160,0.1);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}
.form-group select {
  cursor: pointer;
}

/* 企业微信弹窗 */
.wechat-qr-popup {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 100;
}
.wechat-qr-popup.show {
  opacity: 1;
  visibility: visible;
}
.wechat-qr-popup::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  border: 8px solid transparent;
  border-top-color: var(--white);
}
.wechat-qr-header {
  background: var(--blue-primary);
  color: var(--white);
  padding: 10px 14px;
  border-radius: 8px 8px 0 0;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}
.wechat-qr-close {
  background: none;
  border: none;
  color: var(--white);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}
.wechat-qr-content {
  padding: 20px;
  text-align: center;
}
.wechat-qr-placeholder {
  color: var(--text-muted);
  font-size: 13px;
}
.wechat-phone {
  margin-top: 12px;
  color: var(--blue-primary);
  font-weight: 500;
}

/* ===================== 页脚 ===================== */
.footer {
  background: var(--blue-dark);
  color: rgba(255,255,255,0.8);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo .logo-img {
  height: 38px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.footer-logo .logo-main { color: var(--white); }
.footer-logo .logo-sub { color: rgba(255,255,255,0.5); }
.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
  color: rgba(255,255,255,0.6);
}
.footer-links h4,
.footer-services h4,
.footer-contact h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
}
.footer-links ul li,
.footer-services ul li {
  margin-bottom: 12px;
}
.footer-links a,
.footer-services a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
}
.footer-links a:hover,
.footer-services a:hover {
  color: var(--gold);
}
.footer-contact p {
  font-size: 14px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ===================== 返回顶部 ===================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 4px;
  background: var(--blue-primary);
  color: var(--white);
  border: none;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}
.back-to-top:hover {
  background: var(--gold);
}

/* ===================== 弹窗 ===================== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal.show {
  opacity: 1;
  pointer-events: all;
}
.modal-content {
  background: var(--white);
  border-radius: 8px;
  padding: 40px;
  text-align: center;
  max-width: 420px;
  width: 90%;
}
.modal-icon { font-size: 48px; margin-bottom: 16px; }
.modal-content h3 { font-size: 20px; font-weight: 600; color: var(--text-dark); margin-bottom: 12px; }
.modal-content p { color: var(--text-muted); font-size: 15px; line-height: 1.7; margin-bottom: 24px; }

/* ===================== 在线聊天 ===================== */
.chat-widget {
  position: fixed;
  bottom: 50%;
  right: 24px;
  z-index: 1000;
}
.chat-trigger {
  width: 56px;
  height: 56px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-mid));
  color: var(--white);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.chat-trigger:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(26,58,108,0.4);
}
.chat-trigger.is-open {
  background: var(--text-muted);
}
.chat-window {
  position: absolute;
  bottom: 70px;
  right: 0;
  width: 360px;
  height: 480px;
  background: var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px) scale(0.95);
  transform-origin: bottom right;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}
.chat-window.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.chat-header {
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-mid));
  color: var(--white);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-header-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.chat-avatar {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  position: relative;
}
.chat-online-dot {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 10px;
  height: 10px;
  background: #10b981;
  border: 2px solid var(--white);
  border-radius: 50%;
}
.chat-name {
  font-size: 15px;
  font-weight: 600;
}
.chat-status {
  font-size: 12px;
  opacity: 0.8;
}
.chat-close {
  background: none;
  border: none;
  color: var(--white);
  cursor: pointer;
  padding: 4px;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}
.chat-timestamp {
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  margin: 12px 0;
}
.chat-msg {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.chat-msg.user {
  flex-direction: row-reverse;
}
.chat-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}
.chat-msg.bot .chat-msg-avatar {
  background: var(--blue-pale);
  color: var(--blue-primary);
}
.chat-msg.user .chat-msg-avatar {
  background: var(--gold);
  color: var(--white);
}
.chat-bubble {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.6;
}
.chat-msg.bot .chat-bubble {
  background: var(--bg-light);
  color: var(--text-dark);
}
.chat-msg.user .chat-bubble {
  background: var(--blue-primary);
  color: var(--white);
}
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
  background: var(--bg-light);
  border-radius: 8px;
}
.typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
}
.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}
.chat-quick {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}
.chat-quick-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.chat-quick-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.chat-quick-btn {
  padding: 8px 12px;
  background: var(--blue-pale);
  border: none;
  border-radius: 4px;
  font-size: 12px;
  color: var(--blue-primary);
  cursor: pointer;
  transition: all var(--transition);
}
.chat-quick-btn:hover {
  background: var(--blue-primary);
  color: var(--white);
}
.chat-input-area {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}
.chat-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
}
.chat-input:focus {
  outline: none;
  border-color: var(--blue-mid);
}
.chat-send {
  width: 40px;
  height: 40px;
  background: var(--blue-primary);
  color: var(--white);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.chat-send:hover {
  background: var(--blue-mid);
}
.chat-unread {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  background: #ef4444;
  color: white;
  font-size: 11px;
  font-weight: 600;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
}
.chat-unread.hidden { display: none; }
.chat-trigger-icon { font-size: 22px; }

/* ===================== 动画 ===================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================== 响应式 ===================== */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .process-steps { flex-wrap: wrap; justify-content: center; }
  .process-arrow { display: none; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .nav-container { padding: 0 20px; }
  
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--blue-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }
  .nav-links.open {
    opacity: 1;
    visibility: visible;
  }
  .nav-link { font-size: 18px; }
  .menu-toggle { display: flex; }
  
  .hero-content { padding: 100px 20px 60px; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  
  .services-grid { grid-template-columns: 1fr; }
  .process-step { max-width: 100%; }
  
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  
  .chat-window { width: calc(100vw - 32px); right: -8px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 28px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; }
  .features-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: 24px; }
}