/* ========================================
   河狸云官网公共样式
   版本: 1.0.0
   更新: 2026-02-02
   ======================================== */

/* ========== CSS Variables ========== */
:root {
  color-scheme: light only;
  --primary: #F5811F;
  --primary-dark: #D96A0B;
  --primary-light: #FFF3E8;
  --secondary: #1A2B4A;
  --secondary-light: #2D4A6F;
  --text-primary: #1A1A1A;
  --text-secondary: #666666;
  --text-light: #999999;
  --bg-white: #FFFFFF;
  --bg-light: #F8F9FC;
  --bg-dark: #0D1B2A;
  --border: #E5E7EB;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --success: #10B981;
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

/* ========== Utilities ========== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: 0 4px 16px rgba(245, 129, 31, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 129, 31, 0.4);
}

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

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

.btn-white {
  background: white;
  color: var(--primary);
  font-weight: 600;
}

.btn-white:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
}

/* ========== Header ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.logo-img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex !important;
  align-items: baseline;
  gap: 8px;
}

.logo-text span {
  color: var(--text-light);
  font-weight: 400;
  font-size: 0.875rem;
  margin-left: 0 !important;
  white-space: nowrap;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-light);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 500;
}

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

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-menu-btn:hover {
  background: var(--bg-light);
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
  transform-origin: center;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: white;
  z-index: 999;
  padding: 24px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.mobile-nav.active {
  transform: translateX(0);
}

.mobile-nav-link {
  display: block;
  padding: 16px 0;
  font-size: 1.125rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--primary);
}

.mobile-nav-cta {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-nav-cta .btn {
  width: 100%;
  justify-content: center;
}

/* ========== Footer ========== */
.footer {
  background: var(--bg-dark);
  color: white;
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo-img {
  height: 40px;
  width: auto;
  flex-shrink: 0;
}

.footer-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.footer-logo-text span {
  font-size: 0.875rem;
  font-weight: 400;
  color: rgba(255,255,255,0.65);
  white-space: nowrap;
}

.footer-desc {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
  margin-bottom: 24px;
}

.footer-badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-badge {
  padding: 6px 12px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.8);
  transition: var(--transition);
}

.footer-badge:hover {
  background: rgba(255,255,255,0.2);
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: white;
}

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

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copyright {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}

.footer-copyright a {
  color: rgba(255,255,255,0.6);
  text-decoration: underline;
}

.footer-copyright a:hover {
  color: var(--primary);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: white;
}

/* ========== CTA Section ========== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  text-align: center;
  padding: 80px 0;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ========== FAQ Section ========== */
.faq-section {
  background: var(--bg-light);
  padding: 80px 0;
}

.faq-wrap {
  max-width: 920px;
  margin: 0 auto;
}

.faq-list {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  list-style: none;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 22px 24px;
  position: relative;
  transition: var(--transition);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '▾';
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 1rem;
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-question::after {
  transform: translateY(-50%) rotate(180deg);
}

.faq-question:hover {
  background: rgba(245, 129, 31, 0.06);
}

.faq-answer {
  padding: 0 24px;
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease, padding-bottom 0.25s ease;
}

.faq-answer p {
  min-height: 0;
  overflow: hidden;
  color: var(--text-secondary);
  line-height: 1.75;
}

.faq-item[open] .faq-answer {
  grid-template-rows: 1fr;
  padding-bottom: 20px;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .nav {
    display: none;
  }

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

  .mobile-nav {
    display: block;
  }

  .faq-section {
    padding: 60px 0;
  }

  .faq-question {
    font-size: 1rem;
    padding: 18px 18px;
    padding-right: 46px;
  }

  .faq-question::after {
    right: 18px;
  }

  .faq-answer {
    padding: 0 18px;
  }

  .faq-item[open] .faq-answer {
    padding-bottom: 16px;
  }

  .header-cta .btn-outline {
    display: none;
  }

  .cta-title {
    font-size: 1.75rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}