/* ===== CSS 变量定义 ===== */
:root {
  --color-primary: #6B2D8C;
  --color-accent: #D4AF37;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F5FA;
  --color-text: #333333;
  --color-text-muted: #666666;
  --color-white: #FFFFFF;
  --font-stack: -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  --navbar-height: 60px;
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
}

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

ul,
ol {
  list-style: none;
}

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

/* ===== 工具类 ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 60px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

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

.section-title {
  font-size: 28px;
  color: var(--color-primary);
  margin-bottom: 12px;
  text-align: center;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 40px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  background-color: var(--color-primary);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  font-size: 20px;
  font-weight: bold;
  color: var(--color-white);
}

.nav-logo .accent {
  color: var(--color-accent);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: var(--color-white);
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.nav-links.open {
  display: flex;
  position: absolute;
  top: var(--navbar-height);
  left: 0;
  width: 100%;
  flex-direction: column;
  background-color: var(--color-primary);
  padding: 20px;
  gap: 15px;
}

/* ===== 页脚 ===== */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  padding: 20px 0;
  font-size: 14px;
}

.footer p {
  margin: 4px 0;
}

.footer .icp {
  font-size: 13px;
  opacity: 0.8;
}

/* ===== 通用组件 ===== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  transition: opacity 0.2s;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-weight: bold;
}

.btn-primary:hover {
  opacity: 0.9;
}

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

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.card {
  background-color: var(--color-bg);
  border-radius: 8px;
  padding: 30px 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(107, 45, 140, 0.1);
  border: 1px solid #eee;
}

.card-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.card h3 {
  color: var(--color-primary);
  font-size: 18px;
  margin-bottom: 10px;
}

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

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  font-family: var(--font-stack);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== 页面特定样式 ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary), #8B3DA8);
  color: var(--color-white);
  text-align: center;
  padding: 100px 20px 80px;
  margin-top: var(--navbar-height);
}

.hero h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

.hero p {
  font-size: 18px;
  margin-bottom: 30px;
  opacity: 0.9;
}

.info-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 15px;
}

.info-item {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  font-size: 15px;
}

.info-item .label {
  color: var(--color-text-muted);
}

.info-item .value {
  color: var(--color-text);
  font-weight: 500;
}

.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
}

.contact-item .icon {
  font-size: 24px;
}

.service-detail {
  margin-bottom: 40px;
  padding: 30px;
  background-color: var(--color-bg);
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
  box-shadow: 0 2px 8px rgba(107, 45, 140, 0.08);
}

.service-detail h3 {
  color: var(--color-primary);
  font-size: 20px;
  margin-bottom: 12px;
}

.service-detail p {
  color: var(--color-text-muted);
  margin-bottom: 10px;
  font-size: 14px;
}

.service-detail .scenarios {
  color: var(--color-text);
  font-size: 14px;
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex;
    position: static;
    flex-direction: row;
    width: auto;
    padding: 0;
    background: none;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero p {
    font-size: 20px;
  }

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

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

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

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

@media (min-width: 992px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}