/* 
 * BIUU Styles
 * Main stylesheet for BIUU website
 */

/* Font definitions */
@font-face {
  font-family: 'Andale Mono';
  font-style: normal;
  font-weight: normal;
  font-display: swap;
  src: local('Andale Mono'), url('andale_mono.woff') format('woff');
}

@font-face {
  font-family: 'Avenir Next Cyr';
  font-style: italic;
  font-weight: bold;
  font-display: swap;
  src: local('Avenir Next Cyr'), url('avenir_next_italic.woff') format('woff');
}

/* CSS Variables */
:root {
  --color-primary: #165dff;
  --color-secondary: #36cfc9;
  --color-accent: #722ed1;
  --color-dark: #1d2129;
  --color-light: #f2f3f5;
  --color-muted: #86909c;
}

/* Base styles */
body {
  font-family: "Andale Mono", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, sans-serif;
  background-color: #f2f3f5;
  color: #1d2129;
  margin: 0;
  padding: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: white;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

@media (min-width: 768px) {
  nav {
    height: 3.5rem;
  }
}

.hidden {
  display: none;
}

/* Navigation link styles */
.nav-link-hover {
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.25rem;
  color: #374151;
  transition: color 0.2s;
}

.nav-link-hover::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background-color: transparent;
  transition: background-color 0.2s;
  color: #374151;
}

.nav-link-hover:hover::after {
  background-image: radial-gradient(circle, currentColor 1.5px, transparent 1.5px);
  background-size: 12px 2px;
  background-repeat: repeat-x;
  color: #374151;
}

.nav-link-hover:hover {
    color: #374151;
}

/* Loading indicator */
.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: #374151;
  z-index: 9999;
  transform: translateX(-100%);
}

.loading-indicator.active {
  animation: loading 2s ease-in-out forwards;
}

#page-loader.loading-indicator {
    background-color: gray;  /* 灰色背景 */
}

@keyframes loading {
  0% {
    transform: translateX(-100%);
  }

  50% {
    transform: translateX(-10%);
  }

  100% {
    transform: translateX(0);
  }
}

/* Video container styles */
.video-container {
  opacity: 0;
  transition: opacity 0.5s ease-in-out, transform 0.3s ease-in-out;
}

.video-container.loaded {
  opacity: 1;
}

.video-container.menu-active {
  transform: translateY(150px);
}

.video-overlay {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to top,
      rgba(0, 0, 0, 0.7),
      rgba(0, 0, 0, 0.2),
      transparent);
  opacity: 0;
  transition: opacity 0.3s;
  display: flex;
  align-items: flex-end;
}

.video-overlay:hover {
  opacity: 1;
}

/* Logo Styles */
.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 3.5rem;
}

.logo-container img {
  height: 80%;
  width: auto;
  object-fit: contain;
}

@media (max-width: 768px) {
  .logo-container {
    display: none;
  }
}

/* Utility classes */
.scale-hover {
  transition: transform 0.3s;
}

.scale-hover:hover {
  transform: scale(1.05);
}

.aspect-video {
  aspect-ratio: 16/9;
}

.menu-push {
  transition: transform 0.3s ease-in-out;
}

.writing-vertical-rl {
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.content-auto {
  content-visibility: auto;
}

.dropdown-shadow {
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

/* Media queries */
@media (min-width: 768px) {
  .md\:flex {
    display: flex;
  }

  .md\:hidden {
    display: none;
  }

  .md\:h-14 {
    height: 3.5rem;
  }

  .md\:text-base {
    font-size: 1rem;
  }

  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}