/* 富京AI - 公共样式 */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --secondary: #00c9a7;
  --accent: #6c5ce7;
  --bg: #f5f7fa;
  --white: #ffffff;
  --text: #2d3436;
  --text-light: #636e72;
  --border: #e0e6ed;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 */
.navbar {
  background: var(--white);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar .logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar .logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-menu a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text);
  transition: var(--transition);
  font-weight: 500;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  gap: 6px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

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

.btn-sm {
  padding: 6px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 36px;
  font-size: 17px;
}

.btn-success {
  background: var(--secondary);
  color: white;
}

.btn-success:hover {
  background: #00b396;
}

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-accent:hover {
  background: #5b4cc4;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text);
}

/* Footer */
.footer {
  background: #1a1f36;
  color: #b0b8c9;
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 {
  color: white;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer p {
  font-size: 14px;
  line-height: 1.8;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #b0b8c9;
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
}

/* 卡片 */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.tag-blue {
  background: var(--primary-light);
  color: var(--primary);
}

.tag-green {
  background: #e6f9f4;
  color: var(--secondary);
}

.tag-purple {
  background: #f0edff;
  color: var(--accent);
}

.tag-orange {
  background: #fff4e6;
  color: #f39c12;
}

/* 章节标题 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--text-light);
}

.section-header .line {
  width: 50px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* 进度条 */
.progress-bar {
  width: 100%;
  height: 6px;
  background: #e9ecef;
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* 模态框 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

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

.modal {
  background: var(--white);
  border-radius: 16px;
  padding: 32px;
  max-width: 480px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal h3 {
  font-size: 20px;
  margin-bottom: 20px;
}

/* Toast 提示 */
.toast {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--white);
  border-radius: 12px;
  padding: 16px 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
  z-index: 3000;
  transform: translateX(120%);
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left: 4px solid var(--secondary);
}

.toast.error {
  border-left: 4px solid #e74c3c;
}

.toast.info {
  border-left: 4px solid var(--primary);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  outline: none;
  transition: var(--transition);
  background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination button {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--white);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
}

.pagination button:hover,
.pagination button.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state .icon {
  font-size: 48px;
  margin-bottom: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    gap: 0;
  }

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

  .nav-menu a {
    padding: 12px 16px;
    width: 100%;
  }

  .menu-toggle {
    display: block;
  }

  .nav-right .btn {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .section-header h2 {
    font-size: 24px;
  }

  .container {
    padding: 0 16px;
  }
}