/* ===== Header Layout & Controls ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);

  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  box-sizing: border-box;

  --header-padding-x: 24px;
  --header-bg-top-alpha: 0.7;
  --header-bg-mid-alpha: 0.43;
  --header-bg-bottom-alpha: 0.15;
  --header-bg-mid-stop: 42%;
  --header-blur: 6px;

  --header-left-font-size: 12px;
  --header-left-font-weight: 400;
  --header-left-color: var(--text);

  --header-gap-list-grid: 10px;
  --header-gap-grid-menu: 26px;

  --header-view-font-size: 12px;
  --header-view-font-weight: 400;
  --header-view-color: #666;

  --header-view-active-color: #000;
  --header-view-active-weight: 550;

  --header-view-padding-y: 5px;
  --header-view-padding-x: 10px;

  padding: 0 var(--header-padding-x);

  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, var(--header-bg-top-alpha)) 0%,
    rgba(255, 255, 255, var(--header-bg-mid-alpha)) var(--header-bg-mid-stop),
    rgba(255, 255, 255, var(--header-bg-bottom-alpha)) 100%
  );
  backdrop-filter: blur(var(--header-blur));
  -webkit-backdrop-filter: blur(var(--header-blur));
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  pointer-events: auto;
}

header * {
  pointer-events: auto;
}

/* 左：Contact */
.contact-link {
  position: relative;
  z-index: 2;
  font-size: var(--header-left-font-size);
  font-weight: var(--header-left-font-weight);
  color: var(--header-left-color);
}

.contact-link a {
  display: block;
  font-size: inherit;
  font-weight: inherit;
  line-height: 1;
  color: inherit;
}

/* 右：View controls */
.view-controls {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0;
}

/* List / Grid */
.view-button,
.view-btn {
  font-size: var(--header-view-font-size);
  font-weight: var(--header-view-font-weight);
  color: var(--header-view-color);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--header-view-padding-y) var(--header-view-padding-x);
  line-height: 1;
}

.view-button.active,
.view-btn.active {
  color: var(--header-view-active-color);
  font-weight: var(--header-view-active-weight);
}

#list-view,
#btn-news-list {
  margin-right: var(--header-gap-list-grid);
}

#grid-view,
#btn-news-grid {
  margin-right: var(--header-gap-grid-menu);
}

/* 中央：Logo */
.logo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: block;
  line-height: 0;
}

.logo a {
  display: block;
  line-height: 0;
}

.logo img {
  display: block;
  width: auto;
  height: 26px;
  max-width: none;
  max-height: none;
}