/* ============================================
   广州创益信息技术有限公司 - 全局样式
   弱电智能化系统 · 影音系统集成服务商
   ============================================ */

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

:root {
  --color-primary: #1a3c5e;
  --color-primary-light: #2c5f8a;
  --color-accent: #c49a2b;
  --color-accent-light: #e0be5a;
  --color-dark: #1a1a1a;
  --color-gray-900: #2d2d2d;
  --color-gray-700: #555;
  --color-gray-500: #888;
  --color-gray-300: #bbb;
  --color-gray-100: #eee;
  --color-gray-50: #f7f7f7;
  --color-white: #fff;
  --color-bg: #fafbfc;
  --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Typography --- */
.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--color-gray-500);
  font-size: 1rem;
  margin-bottom: 3rem;
}

.section-title-line {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 0.8rem auto 0;
  border-radius: 2px;
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-primary);
}

.logo-icon {
  width: 48px;
  height: 48px;
  overflow: hidden;
  flex-shrink: 0;
}

.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 8px 18px;
  font-size: 0.95rem;
  color: var(--color-gray-700);
  border-radius: var(--radius);
  font-weight: 500;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: rgba(26, 60, 94, 0.05);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

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

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

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

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer h4 {
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-about p {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-top: 16px;
}

.footer-about .friend-link {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-about .friend-link h4 {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 10px;
}

.footer-about .friend-link .friend-name a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-about .friend-link .friend-name a:hover {
  color: var(--color-accent);
}

.footer-about .friend-link .friend-url {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 6px;
}

.footer-about .friend-link .friend-desc {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.3);
  margin-top: 6px;
  line-height: 1.6;
}

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

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  align-items: flex-start;
}

.footer-contact .icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  overflow: hidden;
  margin-top: 1px;
}
.footer-contact .icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-links-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-links-bar span {
  color: rgba(255, 255, 255, 0.4);
}

.footer-links-bar a {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
}

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

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 60, 94, 0.3);
}

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

.btn-accent:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(196, 154, 43, 0.3);
}

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

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

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

.btn-white:hover {
  background: var(--color-gray-50);
  transform: translateY(-2px);
}

/* --- Page Banner --- */
.page-banner {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0d2538 100%);
  text-align: center;
  color: var(--color-white);
}

.page-banner h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-banner p {
  font-size: 1.05rem;
  opacity: 0.8;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 0.9rem;
  margin-top: 16px;
  opacity: 0.7;
}

.breadcrumb a:hover {
  color: var(--color-accent-light);
}

/* --- Stats --- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  padding: 60px 0;
}

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

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--color-gray-500);
  margin-top: 8px;
}

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

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

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 70px 0;
  text-align: center;
  color: var(--color-white);
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 30px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
}

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

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }

  .nav {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--color-white);
    flex-direction: column;
    padding: 20px;
    gap: 8px;
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    z-index: 999;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
  }

  .mobile-toggle {
    display: flex;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

  .section-title {
    font-size: 1.6rem;
  }

  .page-banner h1 {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .stats {
    grid-template-columns: 1fr 1fr;
  }

  .stat-number {
    font-size: 2rem;
  }
}