@charset "UTF-8";

/* ==========================================================================
   Modern Minimalist Enterprise Theme - Base Variables (Matching main.css)
   ========================================================================== */
:root {
  /* Color Palette */
  --color-primary: #0066cc;
  --color-primary-hover: #004499;
  --color-text-main: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-text-muted: #a1a1a6;
  --color-bg-body: #ffffff;
  --color-bg-section: #f5f5f7;
  --color-bg-card: #ffffff;
  --color-border: #d2d2d7;
  
  /* Typography */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  
  /* Layout & Spacing */
  --max-width-container: 1200px;
  --header-height: 64px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 20px 48px rgba(0, 0, 0, 0.12);
  
  /* Transitions */
  --transition-base: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Page Banner
   ========================================================================== */
.page-banner {
  margin-top: var(--header-height);
  padding: 80px 24px;
  background-color: var(--color-bg-section);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.page-banner-content {
  position: relative;
  z-index: 2;
  animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.page-banner h1 {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.page-banner p {
  font-size: 20px;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* ==========================================================================
   About Section - Mission Vision (Full Page Style)
   ========================================================================== */
.mission-vision-section {
  min-height: 100vh;
  padding: 80px 24px;
  background-color: var(--color-bg-body);
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
}

.mv-container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  width: 100%;
}

.mv-header {
  margin-bottom: 50px;
  text-align: center;
}

.mv-header h2 {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.mv-header p {
  font-size: 16px;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.mv-list {
  display: flex;
  flex-direction: column;
}

.mv-item {
  display: flex;
  align-items: flex-start;
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  transition: var(--transition-base);
}

.mv-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.mv-item:hover {
  background-color: var(--color-bg-section);
  padding-left: 32px;
  padding-right: 32px;
  margin-left: -32px;
  margin-right: -32px;
  border-radius: 12px;
  border-top-color: transparent;
}

/* 修复悬浮时相邻边框消失的问题 */
.mv-list:hover .mv-item:not(:hover) {
  border-top-color: var(--color-border);
}

.mv-label {
  flex: 0 0 200px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  padding-top: 6px;
}

.mv-content {
  flex: 1;
}

.mv-content h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 16px;
  line-height: 1.4;
  letter-spacing: -0.5px;
}

.mv-content p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 800px;
}

/* ==========================================================================
   About Section - Scroll Timeline
   ========================================================================== */
.scroll-timeline-section {
  height: 600vh;
  position: relative;
  background-color: #ffffff;
  margin: 0;
}

.scroll-timeline-sticky {
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  width: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.scroll-timeline-title {
  position: absolute;
  top: 8%;
  left: 0;
  width: 100%;
  text-align: center;
  z-index: 10;
}

.scroll-timeline-title h2 {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 8px;
  letter-spacing: -1px;
}

.scroll-track-container {
  position: relative;
  width: 100%;
  height: 500px;
  display: flex;
  align-items: center;
  margin-top: 50px;
}

/* 虚线基准线，模仿大厂的流线感 */
.scroll-track-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100vw;
  height: 0;
  border-top: 2px dashed rgba(0, 102, 204, 0.25);
  z-index: 1;
}

.scroll-track {
  display: flex;
  align-items: center;
  position: relative;
  padding-left: 100vw; /* 初始偏移，从右侧进入 */
  padding-right: 80vw; /* 增加右侧 padding，让轨道更长 */
  will-change: transform;
  z-index: 2;
}

.scroll-item {
  width: 360px;
  flex-shrink: 0;
  position: relative;
  margin-right: 300px; /* 拉大卡片间距，配合更长的轨道 */
  /* 去除卡片背景，拥抱大厂留白风格 */
  background: transparent;
  padding: 0;
  box-shadow: none;
  border: none;
}

.scroll-item.up {
  transform: translateY(-140px);
}

.scroll-item.down {
  transform: translateY(140px);
}

.si-year {
  font-size: 80px;
  font-weight: 900;
  /* 渐变色大字体 */
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.85) 0%, rgba(128, 179, 255, 0.6) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
  line-height: 1;
  letter-spacing: -2px;
}

.si-title {
  font-size: 20px;
  color: var(--color-text-main);
  margin-bottom: 8px;
  font-weight: 700;
}

.si-desc {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background: var(--color-bg-section);
  padding: 80px 24px 40px;
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 48px;
  margin-bottom: 64px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer-col ul li a:hover {
  color: var(--color-text-main);
}

.copyright {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 12px;
}

/* ==========================================================================
   Animations & Responsive
   ========================================================================== */
@keyframes fadeUp {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes bgPulse {
  0% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.5); opacity: 0.8; }
  100% { transform: scale(1); opacity: 0.5; }
}


/* Scroll Reveal System */
.reveal {
  opacity: 0;
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal.fade-up { transform: translateY(50px); }
.reveal.fade-left { transform: translateX(-50px); }
.reveal.fade-right { transform: translateX(50px); }
.reveal.zoom-in { transform: scale(0.95); }
.reveal.active { opacity: 1; transform: translate(0) scale(1); }

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

@media (max-width: 992px) {
  .scroll-item {
    width: 280px;
    margin-right: 200px;
  }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-bg-body);
    flex-direction: column;
    padding: 40px 24px;
    transition: var(--transition-base);
  }
  .nav-menu.active { left: 0; }
  .nav-menu a { font-size: 20px; display: block; padding: 12px 0; }
  
  .page-banner { height: 240px; }
  .page-banner h1 { font-size: 32px; }

  /* Mission Vision Mobile */
  .mission-vision-section {
    padding: 60px 20px;
    justify-content: flex-start;
  }
  .mv-header h2 {
    font-size: 32px;
  }
  .mv-item {
    flex-direction: column;
    padding: 30px 0;
  }
  .mv-item:hover {
    padding-left: 0;
    padding-right: 0;
    margin-left: 0;
    margin-right: 0;
    background-color: transparent;
  }
  .mv-label {
    flex: none;
    margin-bottom: 20px;
  }
  .mv-content h3 {
    font-size: 24px;
  }
  .mv-content p {
    font-size: 16px;
  }
  
  .scroll-timeline-section {
    height: 400vh;
  }
  
  .scroll-item {
    width: 260px;
    margin-right: 150px;
  }
  
  .scroll-item.up { transform: translateY(-130px); }
  .scroll-item.down { transform: translateY(130px); }
  
  .si-year {
    font-size: 50px;
  }
  
  .copyright { flex-direction: column; gap: 16px; text-align: center; }
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-body); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }
::selection { background: var(--color-primary); color: #fff; }