/* 关于我们页面样式（原 about.html 内联 <style> 外置）
   依赖 css/main.css 的变量层，本文件须在 main.css 之后引入。 */

/* 关于页面专属样式 */
.about-hero {
  background: linear-gradient(155deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 70%, var(--primary-lighter) 100%);
  padding: 80px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
}
.about-hero-content {
  position: relative;
  z-index: 1;
}
.about-hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.about-hero p {
  font-size: var(--font-title-lg);
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}
.about-wave {
  line-height: 0;
  background: linear-gradient(155deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 70%, var(--primary-lighter) 100%);
}
.about-wave svg {
  width: 100%;
  height: 50px;
  display: block;
}

/* 核心数据 */
.stats-section {
  background: #fff;
  padding: 60px 0;
  margin-top: -50px;
  position: relative;
  z-index: 2;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.stats-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--primary-bg);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}
.stats-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.stats-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-display);
}
.stats-num {
  font-size: var(--font-mega);
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 4px;
}
.stats-label {
  font-size: var(--font-base);
  color: var(--text-secondary);
}

/* 平台简介 */
.intro-section {
  padding: 80px 0;
  background: var(--primary-bg);
}
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.intro-text h2 {
  font-size: var(--font-hero);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.intro-text h2 span {
  color: var(--primary);
}
.intro-text p {
  font-size: var(--font-title);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}
.intro-image {
  background: linear-gradient(135deg, var(--primary), var(--purple));
  border-radius: var(--radius-2xl);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}
.intro-image-icon {
  width: 120px;
  height: 120px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 60px;
}

/* 优势特色 */
.features-section {
  padding: 80px 0;
  background: #fff;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature-card {
  padding: 40px 28px;
  background: var(--primary-bg);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: var(--transition);
  border: 2px solid transparent;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-pale);
}
.feature-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-hero);
}
.feature-card:nth-child(2) .feature-icon {
  background: linear-gradient(135deg, var(--green), var(--success-strong));
}
.feature-card:nth-child(3) .feature-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
}
.feature-card:nth-child(4) .feature-icon {
  background: linear-gradient(135deg, var(--purple-light), var(--purple));
}
.feature-card:nth-child(5) .feature-icon {
  background: linear-gradient(135deg, var(--danger), var(--danger-strong));
}
.feature-card:nth-child(6) .feature-icon {
  background: linear-gradient(135deg, var(--cyan-light), var(--cyan));
}
.feature-title {
  font-size: var(--font-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.feature-desc {
  font-size: var(--font-base);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 服务流程 */
.process-section {
  padding: 80px 0;
  background: var(--primary-bg);
}
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.process-grid::before {
  content: '';
  position: absolute;
  top: 48px;
  left: 10%;
  right: 10%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--purple), var(--green), var(--accent));
  border-radius: var(--radius-2xs);
  z-index: 0;
}
.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}
.process-num {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: #fff;
  border: 4px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-3xl);
  font-weight: 800;
  color: var(--primary);
}
.process-step:nth-child(2) .process-num { border-color: var(--purple); color: var(--purple); }
.process-step:nth-child(3) .process-num { border-color: var(--green); color: var(--green); }
.process-step:nth-child(4) .process-num { border-color: var(--accent); color: var(--accent); }
.process-title {
  font-size: var(--font-title-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.process-desc {
  font-size: var(--font-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 底部CTA */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  text-align: center;
}
.cta-section h2 {
  font-size: var(--font-hero);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: var(--font-title);
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
}
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-buttons .btn-primary {
  background: #fff;
  color: var(--primary);
  border-color: #fff;
}
.cta-buttons .btn-primary:hover {
  background: var(--primary-bg);
  transform: translateY(-2px);
}
.cta-buttons .btn-outline {
  border-color: rgba(255,255,255,0.7);
  color: #fff;
}
.cta-buttons .btn-outline:hover {
  background: rgba(255,255,255,0.15);
}

/* 帮助中心 */
.help-section {
  padding: 80px 0;
  background: #fff;
}
.help-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
}
.help-tab {
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-size: var(--font-lg);
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--primary-bg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}
.help-tab:hover {
  color: var(--primary);
  border-color: var(--primary-pale);
}
.help-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.help-content {
  display: none;
}
.help-content.active {
  display: block;
}

/* FAQ 手风琴 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--primary-bg);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  border: 2px solid transparent;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--primary-pale);
}
.faq-item.open {
  border-color: var(--primary);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: var(--font-title);
  font-weight: 600;
  color: var(--text-primary);
  gap: 16px;
}
.faq-question .faq-icon {
  width: 28px;
  height: 28px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: var(--font-base);
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-question .faq-icon {
  background: var(--primary-dark);
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-item.open .faq-answer {
  max-height: 300px;
}
.faq-answer-inner {
  padding: 0 24px 20px 24px;
  font-size: var(--font-base);
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 联系我们 */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}
.contact-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--primary-bg);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.contact-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-display);
}
.contact-card:nth-child(2) .contact-icon {
  background: linear-gradient(135deg, var(--green), var(--success-strong));
}
.contact-card:nth-child(3) .contact-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
}
.contact-title {
  font-size: var(--font-title-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.contact-value {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 意见反馈 */
.feedback-wrapper {
  max-width: 600px;
  margin: 0 auto;
}
.feedback-form {
  background: var(--primary-bg);
  border-radius: var(--radius-xl);
  padding: 40px;
}
/* 表单：几何与状态统一走 main.css 的 .form-control / .btn */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--sp-5);
}
.feedback-form textarea.form-control {
  min-height: 120px;
}
.form-submit {
  width: 100%;
}

/* Toast 提示 */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text-strong);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: var(--font-base);
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s ease;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.toast.success {
  background: var(--green);
}
.toast.error {
  background: var(--danger);
}

/* 响应式 */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .process-grid::before { display: none; }
}
@media (max-width: 768px) {
  .intro-grid { grid-template-columns: 1fr; }
  .intro-image { min-height: 200px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stats-card { padding: 24px 16px; }
  .stats-num { font-size: var(--font-display); }
  .features-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .help-tabs { flex-wrap: wrap; }
  .help-tab { padding: 10px 20px; font-size: var(--font-base); }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .feedback-form { padding: 24px; }
}

/* 底部页脚 */
.site-footer {
  background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-strong) 100%);
  padding: 60px 0 0;
  color: #fff;
}
.site-footer .footer-content {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.site-footer .footer-brand {
  max-width: 320px;
}
.site-footer .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 16px;
}
.site-footer .logo-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: var(--font-title-lg);
  font-weight: 900;
}
.site-footer .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.site-footer .logo-main {
  font-size: var(--font-title-lg);
  font-weight: 800;
  color: #fff;
}
.site-footer .logo-sub {
  font-size: var(--font-sm);
  color: var(--text-muted);
}
.site-footer .footer-desc {
  font-size: var(--font-base);
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
}
.site-footer .footer-links {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}
.site-footer .footer-column h4 {
  font-size: var(--font-title);
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  position: relative;
}
.site-footer .footer-column h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 24px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-lighter));
  border-radius: var(--radius-2xs);
}
.site-footer .footer-column {
  min-width: 120px;
}
.site-footer .footer-column a {
  display: block;
  font-size: var(--font-base);
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 0;
  transition: all 0.2s ease;
  position: relative;
}
.site-footer .footer-column a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.2s ease;
}
.site-footer .footer-column a:hover {
  color: #fff;
  padding-left: 16px;
}
.site-footer .footer-column a:hover::before {
  width: 8px;
}
.site-footer .site-footer-bottom {
  background: transparent;
  padding: 24px 0;
  text-align: center;
}
.site-footer .site-footer-bottom p {
  font-size: var(--font-md);
  color: var(--text-tertiary);
  margin: 0;
}
.site-footer .site-footer-bottom a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s ease;
}
.site-footer .site-footer-bottom a:hover {
  color: var(--primary-light);
}

@media (max-width: 768px) {
  .site-footer .footer-content {
    flex-direction: column;
    gap: 32px;
  }
  .site-footer .footer-links {
    gap: 32px;
  }
  .site-footer .footer-brand {
    max-width: 100%;
  }
}