/* =========================================
   背景图 & 深色模式遮罩
========================================= */
body {
  background-image: url("/image/background.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;

  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial;
  font-size: clamp(18px, 2vw, 28px);
  line-height: 1.4;
  color: #333;
}

body.dark-mode::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  pointer-events: none;
  z-index: -1;
}

a {
  text-decoration: none !important;
}

/* =========================================
   顶部水平导航条（全站统一）
========================================= */
.topbar {
  width: 100%;
  height: 48px;
  display: flex;
  align-items: center;
  padding: 0 10px;

  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;

  background: rgba(255,255,255,0.25);
  backdrop-filter: blur(25px);
  border-bottom: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);

  position: sticky;
  top: 0;
  z-index: 300;
}

.topbar::-webkit-scrollbar {
  display: none;
}

/* 中文主文字（最终合并版） */
.topbar a {
  color: black;                /* 中文黑色（关键） */
  font-weight: 600;
  text-decoration: none;

  display: inline-block;
  padding: 6px 18px;
  margin-right: 16px;
  font-size: 18px;

  background: rgba(255,255,255,0.35);
  backdrop-filter: blur(20px);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* 英文辅助文字 */
.topbar a .en {
  font-size: 0.55em;      /* 更小的英文 */
  opacity: 0.6;           /* 更淡 */
  margin-left: 4px;
  letter-spacing: 0.5px;
}

/* =========================================
   首页布局
========================================= */
.home-layout {
  height: 100vh;
  overflow: hidden;
}

.home-right {
  width: 100%;
  height: 100%;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
}

/* PC 默认布局 */
@media (min-width: 900px) {
  main {
    margin-left: 0 !important;
    padding: 20px;
  }
}

/* 移动端居中内容 */
@media (max-width: 899px) {
  .home-section {
    height: calc(100vh - 48px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 0;
  }
}

/* PC 内容保持上对齐 */
.home-section {
  height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20px;
}

/* =========================================
   玻璃卡片
========================================= */
.glass-card {
  background: rgba(255,255,255,0.35);
  backdrop-filter: blur(25px);
  border-radius: 32px;
  padding: 32px;
  margin-bottom: 20px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

/* =========================================
   动画
========================================= */
.fade-pair {
  opacity: 0;
  transform: translateY(40px) scale(0.97);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* =========================================
   输入框（玻璃风）
========================================= */
.input-glass {
  width: 100%;
  padding: 12px 16px;
  margin-top: 12px;
  font-size: 18px;

  background: rgba(255,255,255,0.35);
  backdrop-filter: blur(20px);
  border: none;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);

  outline: none;
}

body.dark-mode .input-glass {
  background: rgba(40,40,60,0.35);
  color: #f0f0f0;
}

/* =========================================
   表单标签
========================================= */
.form-label {
  font-size: 22px;
  margin-top: 20px;
  margin-bottom: 8px;
  display: block;
}

/* =========================================
   提交按钮
========================================= */
.submit-btn {
  width: 100%;
  padding: 16px;
  font-size: 22px;
  border-radius: 16px;
  border: none;
  background: rgba(255,255,255,0.45);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  cursor: pointer;
  margin-top: 10px;
}

.submit-btn:hover {
  background: rgba(255,255,255,0.65);
}

/* =========================================
   友情链接卡片
========================================= */
.friend-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 20px;
}

.friend-card {
  display: flex;
  align-items: center;
  gap: 16px;

  padding: 20px;
  border-radius: 20px;

  background: rgba(255,255,255,0.35);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);

  text-decoration: none;
  color: #333;
  font-size: 22px;
}

.friend-card:hover {
  background: rgba(255,255,255,0.55);
}

.favicon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

body.dark-mode .friend-card {
  background: rgba(40,40,60,0.35);
  color: #f0f0f0;
}

body.dark-mode .friend-card:hover {
  background: rgba(80,80,120,0.55);
}