/* ========================================
   荣利福丝绸 - 网站首页样式 (PC端)
   手机端由 mobile.html + Tailwind 负责
   ======================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Source Sans 3', 'Helvetica Neue', 'Arial', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: #ffffff;
  color: #000000;
  overflow-x: hidden;
  min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* Scroll-Triggered Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s cubic-bezier(0.25, 1, 0.5, 1),
              transform 0.9s cubic-bezier(0.25, 1, 0.5, 1);
}
.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Navigation Bar
   ======================================== */
.navbar {
  width: 100%;
  max-width: 1920px;
  margin: 76px auto 94px auto;
  border-top: 1px solid #000;
  border-bottom: 1px solid #000;
  background-color: #ffffff;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 83px;
}

.nav-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  position: relative;
}

.nav-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 24px;
  background-color: #000000;
}

.nav-link {
  font-size: 18px;
  font-weight: 300;
  letter-spacing: 4px;
  color: #000;
  transition: color 0.3s ease;
  font-family: 'Source Sans 3', 'Helvetica Neue', 'Arial', sans-serif;
}

.nav-link:hover {
  color: #2e8b3e;
}

/* ========================================
   Hero Slider Section
   ======================================== */
.hero-slider {
  width: 100%;
  position: relative;
  overflow: hidden;
  padding: 0 0 100px 0;
}

.slide {
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.slide-active {
  position: relative;
  opacity: 1;
  visibility: visible;
}

.slide-content {
  display: flex;
  align-items: flex-start;
  width: 100%;
  max-width: 1920px;
  margin: 0 auto;
}

/* Left Column */
.slide-left {
  width: 45.88%;
  height: 33.85vw;
  max-height: 650px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.slide-bg-img {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: block;
  object-fit: cover;
}

.logo-wrapper {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 240px;
  height: auto;
  z-index: 2;
  opacity: 0;
  transition: opacity 1.2s cubic-bezier(0.25, 1, 0.5, 1),
              transform 1.2s cubic-bezier(0.25, 1, 0.5, 1),
              filter 0.4s ease;
}

.slide-active .logo-wrapper {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.slide-logo {
  width: 100%;
  height: auto;
  display: block;
  animation: logo-spin 40s linear infinite;
}

@keyframes logo-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.slide-left:hover .logo-wrapper {
  transform: translate(-50%, -50%) scale(1.06);
  filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.65));
}

/* Spacer */
.slide-spacer {
  width: 2.08%;
  flex-shrink: 0;
}

/* Center Column */
.slide-center {
  width: 19.95%;
  height: 33.85vw;
  max-height: 650px;
  position: relative;
  flex-shrink: 0;
}

.slide-model-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Pagination Dots */
.slide-dots {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding-top: 16px;
  z-index: 5;
}

.dot {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #cccccc;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.dot-active { background-color: #333333; }
.dot:hover { background-color: #666666; }

/* Right Column */
.slide-right {
  width: 32.08%;
  height: 33.85vw;
  max-height: 650px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 40px;
}

.slide-text-wrapper {
  text-align: center;
}

.slide-text-en {
  font-size: 54px;
  font-weight: 200;
  line-height: 1.15;
  color: #c0c0c0;
  letter-spacing: 1px;
  font-family: 'Playfair Display', 'Georgia', serif;
  margin-bottom: 46px;
}

.slide-text-en span { display: block; }

.slide-text-cn {
  font-size: 21px;
  color: #2e8b3e;
  letter-spacing: 4px;
  font-weight: 400;
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* Large Screen Cap */
@media (min-width: 1920px) {
  .slide-left, .slide-center, .slide-right { height: 650px; }
}

@media (max-width: 1200px) {
  .slide-text-en { font-size: 40px; margin-bottom: 30px; }
  .logo-wrapper { width: 190px; }
  .nav-link { font-size: 16px; }
}