/* ============================================
   共可深圳科技有限公司官网 - 公共样式
   设计理念：共筑可能，科技赋能
   ============================================ */

/* ===== CSS 变量定义 ===== */
:root {
  /* 主题色 */
  --color-primary: #0A2540;
  --color-primary-light: #14365E;
  --color-primary-dark: #061A2E;
  --color-accent: #00D4FF;
  --color-accent-dim: #0099CC;
  --color-highlight: #FF6B35;
  --color-highlight-dim: #E5552A;

  /* 中性色 */
  --color-white: #FFFFFF;
  --color-bg: #F5F7FA;
  --color-bg-alt: #EEF2F7;
  --color-dark: #1A1A2E;
  --color-text: #2C3E50;
  --color-text-light: #5A6C7D;
  --color-text-muted: #8B9BAC;
  --color-border: #E1E8EF;
  --color-border-dark: rgba(255, 255, 255, 0.1);

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #0A2540 0%, #14365E 100%);
  --gradient-accent: linear-gradient(135deg, #00D4FF 0%, #0099CC 100%);
  --gradient-highlight: linear-gradient(135deg, #FF6B35 0%, #FF8F5E 100%);
  --gradient-text: linear-gradient(135deg, #00D4FF 0%, #FF6B35 100%);
  --gradient-hero: radial-gradient(ellipse at 20% 30%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 70%, rgba(255, 107, 53, 0.12) 0%, transparent 50%),
                   linear-gradient(180deg, #061A2E 0%, #0A2540 100%);

  /* 字体 */
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Space Grotesk', 'JetBrains Mono', monospace;

  /* 间距 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;
  --space-3xl: 128px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10, 37, 64, 0.08);
  --shadow-md: 0 8px 24px rgba(10, 37, 64, 0.12);
  --shadow-lg: 0 16px 48px rgba(10, 37, 64, 0.16);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.25);

  /* 布局 */
  --container-width: 1280px;
  --header-height: 72px;

  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== 区块 ===== */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

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

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

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  padding: 6px 16px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px;
}

.section--dark .section-label {
  background: rgba(0, 212, 255, 0.1);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.section--dark .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.section--dark .section-subtitle {
  color: rgba(255, 255, 255, 0.7);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 1.5px solid transparent;
}

.btn--primary {
  background: var(--gradient-accent);
  color: var(--color-primary-dark);
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.45);
}

.btn--highlight {
  background: var(--gradient-highlight);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
}

.btn--highlight:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.45);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-accent);
}

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

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dim);
  background: rgba(0, 212, 255, 0.04);
}

.btn--lg {
  padding: 18px 40px;
  font-size: 1.05rem;
}

.btn--sm {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* ===== 导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.header--scrolled {
  background: rgba(6, 26, 46, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.header--solid {
  background: rgba(6, 26, 46, 0.96);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.logo__mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-primary-dark);
  font-size: 1.2rem;
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo__text small {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.1em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  padding: 10px 18px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-link:hover {
  color: var(--color-white);
}

.nav-link:hover::after,
.nav-link--active::after {
  width: 24px;
}

.nav-link--active {
  color: var(--color-white);
}

.nav-cta {
  margin-left: var(--space-sm);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle--active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle--active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 页脚 ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-2xl) 0 var(--space-lg);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.4;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand .logo {
  margin-bottom: var(--space-md);
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--space-md);
  max-width: 320px;
}

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

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.footer-title {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  letter-spacing: 0.02em;
}

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

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-contact li {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.5;
}

.footer-contact svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-accent);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

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

/* ===== 通用组件 ===== */
/* 网格背景 */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.bg-grid--light {
  background-image:
    linear-gradient(rgba(10, 37, 64, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 37, 64, 0.04) 1px, transparent 1px);
}

/* 渐变文字 */
.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 卡片 */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

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

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-accent-dim);
}

.tag--highlight {
  background: rgba(255, 107, 53, 0.1);
  color: var(--color-highlight);
}

.tag--dark {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 分隔装饰 */
.divider-glow {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.3;
}

/* ===== 动画 ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(20px); opacity: 0; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 滚动触发动画初始状态 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* 页面顶部占位（固定导航栏偏移） */
.page-top-offset {
  padding-top: var(--header-height);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --space-2xl: 64px;
    --space-3xl: 80px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(6, 26, 46, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    gap: 4px;
    transform: translateY(-150%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-menu--open {
    transform: translateY(0);
  }

  .nav-link {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
  }

  .nav-link:hover {
    background: rgba(255, 255, 255, 0.05);
  }

  .nav-cta {
    margin: var(--space-sm) 0 0;
  }

  .nav-cta .btn {
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .section-header {
    margin-bottom: var(--space-xl);
  }
}

/* 选中文本样式 */
::selection {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary-light);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}