/* 顶栏 / 页脚 / 弹层布局（提取自 App.vue） */
.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶部滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 5000;
  pointer-events: none;
}

.scroll-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent3));
  transform: scaleX(0);
  transform-origin: left center;
}

/* ---------- Top bar：固定底色 ---------- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2000;
  padding: 16px 32px;
  pointer-events: none;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background 0.5s ease, border-color 0.5s ease;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  pointer-events: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}

.brand-logo {
  height: 48px;
  width: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.brand-word {
  font-size: 24px;
  font-weight: 600;
}

/* ---------- 9 个导航按钮直接展示 ---------- */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
  /* 关键：overflow 必须保持 visible，否则下拉菜单被父容器裁剪不可见 */
  overflow: visible;
}

.primary-nav::-webkit-scrollbar {
  display: none;
}

.nav-link {
  padding: 8px 11px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
  border-radius: 6px;
  transition: color 0.25s, background 0.25s;
}

.nav-link:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.nav-link.active {
  color: var(--accent);
  font-weight: 600;
}

/* Learn 下拉菜单（暗黑科技风） */
.nav-drop {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-caret {
  display: inline-block;
  font-size: 9px;
  margin-left: 5px;
  opacity: 0.7;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-drop:hover .nav-caret {
  transform: rotate(180deg);
  opacity: 1;
  color: var(--accent);
}

/* 下拉菜单：深青黑背景 + 细微边框 + 柔和阴影 + 圆角，居中于 LEARN 按钮 */
.nav-drop-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 124px;
  display: flex;
  flex-direction: column;
  padding: 8px;
  background: #081520;
  border: 1px solid rgba(114, 234, 216, 0.16);
  border-radius: 14px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45), 0 4px 14px rgba(6, 20, 27, 0.3);
  z-index: 99999;
  /* 显示/隐藏完全由 JS 状态（v-show）控制：显示即显示、隐藏立即移除 DOM，无任何动画 */
}

.nav-sub-link {
  display: block;
  padding: 9px 14px;
  border-radius: 9px;
  font-size: 11px;
  line-height: 1.5;
  color: rgba(233, 242, 239, 0.78);
  text-decoration: none;
  transition: all 0.18s ease;
  white-space: nowrap;
  text-align: center;
}

.nav-sub-link:hover {
  background: rgba(114, 234, 216, 0.1);
  color: var(--accent);
}

.nav-sub-link.active {
  background: rgba(114, 234, 216, 0.16);
  color: var(--accent);
}

.topbar-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--nav-glass, transparent);
  backdrop-filter: blur(8px);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.12em;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.tool-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tool-btn:has(svg) {
  width: 40px;
  padding: 0;
}

.auth-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.auth-btn:hover {
  background: transparent;
  color: var(--accent);
}

.tool-user-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 14px 5px 5px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  transition: all 0.25s;
}

.tool-user-link:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.tool-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
}

.tool-user {
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.tool-user-link:hover .tool-user {
  color: var(--accent);
}

/* ============ 平板 / 手机适配 ============ */
@media (max-width: 900px) {
  .brand-word {
    display: none;
  }

  .topbar {
    padding: 10px 14px;
  }

  .brand-logo {
    height: 38px;
    width: 38px;
  }

  /* 导航按钮横向滑动（不换行、不溢出） */
  .primary-nav {
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav-link {
    padding: 7px 9px;
    font-size: 11px;
  }

  .tool-btn {
    height: 34px;
    padding: 0 12px;
    font-size: 11px;
  }

  .tool-btn:has(svg) {
    width: 34px;
  }

  .tool-user {
    max-width: 88px;
  }
}

@media (max-width: 520px) {
  .topbar-inner {
    gap: 8px;
  }

  /* 手机：语言/主题按钮只留图标宽度，用户名字更短 */
  .tool-btn {
    padding: 0 9px;
    letter-spacing: 0.04em;
  }

  .tool-user {
    max-width: 64px;
    font-size: 12px;
  }

  .brand-logo {
    height: 32px;
    width: 32px;
  }
}

.page {
  flex: 1;
}

.mini-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0;
}

.mini-footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}
/* ICP 备案号 */
.mini-footer-icp {
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.22s;
}

.mini-footer-icp:hover {
  color: var(--accent);
}