/* ==========================================================================
   学习空间 · 科技感增强层 (tech layer)
   在 style.css 之后加载：只做视觉增强，不改 DOM 结构、不改交互契约
   设计语言：浅冷灰底 + 白卡片 + 青(主) / 紫罗兰(副) 双色 + 细网格 + 柔和阴影
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. 令牌补充：增强层专用
   -------------------------------------------------------------------------- */

:root {
  /* 让表单控件、滚动条等原生 UI 也走亮色 */
  color-scheme: light;

  --fx-grid: rgba(8, 145, 178, 0.055);
  --fx-grid-size: 44px;
  --fx-glass: rgba(255, 255, 255, 0.82);
  --fx-glass-solid: rgba(255, 255, 255, 0.97);
  --fx-sheen: rgba(8, 145, 178, 0.025);
  --fx-inset-line: rgba(8, 145, 178, 0.18);
}

/* --------------------------------------------------------------------------
   1. 全局氛围：光晕 + 网格 + 扫描带
   -------------------------------------------------------------------------- */

/* 顶部双色光源：左青右紫，底部补一点冷光 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(720px 480px at 4% -16%, rgba(8, 145, 178, 0.1), transparent 60%),
    radial-gradient(540px 400px at 100% -14%, rgba(124, 58, 237, 0.06), transparent 56%),
    radial-gradient(1000px 680px at 50% 114%, rgba(8, 145, 178, 0.04), transparent 62%);
}

/* 网格：向四角淡出，像无限延展的控制台地面 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--fx-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--fx-grid) 1px, transparent 1px);
  background-size: var(--fx-grid-size) var(--fx-grid-size);
  -webkit-mask-image: radial-gradient(ellipse 86% 66% at 50% 20%, #000 15%, transparent 76%);
  mask-image: radial-gradient(ellipse 86% 66% at 50% 20%, #000 15%, transparent 76%);
}

/* 选中文字 */
::selection {
  background: rgba(8, 145, 178, 0.18);
  color: #0b1220;
}

/* 滚动条 */
html {
  scrollbar-color: #c9d5e5 #f2f5fa;
  scrollbar-width: thin;
}

::-webkit-scrollbar {
  width: 11px;
  height: 11px;
}

::-webkit-scrollbar-track {
  background: #f2f5fa;
}

::-webkit-scrollbar-thumb {
  background: #c9d5e5;
  border: 2px solid #f2f5fa;
  border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background: #9aabc4;
}

/* 焦点环统一成青色发光 */
:focus-visible {
  outline: 2px solid rgba(8, 145, 178, 0.75);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(8, 145, 178, 0.12);
}

/* 数字统一等宽对齐，避免跳动 */
.hero-stat b,
.post-meta,
.post-card-top,
.side-stats,
.admin-table td,
.pagination button {
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   2. 顶栏：玻璃 + 霓虹底线
   -------------------------------------------------------------------------- */

.site-header {
  background: var(--fx-glass);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(8, 145, 178, 0.14);
}

/* 底边一条会呼吸的青紫渐变线 */
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.55) 22%,
    rgba(124, 58, 237, 0.5) 64%,
    transparent
  );
}

.brand-mark {
  position: relative;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(8, 145, 178, 0.28),
    0 0 24px -4px var(--glow-cyan),
    0 6px 18px -10px rgba(19, 28, 46, 0.14);
}

.brand-text strong {
  background: linear-gradient(100deg, #131c2e 8%, #0891b2 58%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text em {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.primary-nav a {
  position: relative;
  letter-spacing: 0.01em;
  transition: color 0.18s ease;
}

/* 悬停 / 当前页：底部霓虹下划线 */
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 1.5px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--violet));
  box-shadow: 0 0 8px var(--glow-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}

.primary-nav a:hover::after,
.primary-nav a.active::after {
  transform: scaleX(1);
}

.primary-nav a.active {
  color: var(--brand-dark);
}

.icon-btn {
  border-radius: 9px;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.22s ease;
}

.icon-btn:hover {
  color: var(--brand-dark);
  background: rgba(8, 145, 178, 0.09);
  box-shadow: 0 0 18px -6px var(--glow-cyan);
}

.avatar {
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.35), 0 0 16px -6px var(--glow-cyan);
}

.search-bar {
  border-bottom: 1px solid rgba(8, 145, 178, 0.12);
  background: rgba(255, 255, 255, 0.82);
}

.user-menu-panel {
  background: var(--fx-glass-solid);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid rgba(8, 145, 178, 0.16);
  box-shadow:
    0 0 30px -16px var(--glow-cyan),
    0 24px 48px -28px rgba(19, 28, 46, 0.14);
}

.menu-item:hover {
  background: rgba(8, 145, 178, 0.09);
  color: var(--brand-dark);
}

/* --------------------------------------------------------------------------
   3. Hero：光源 + 渐变分割线 + 发光文字
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  background: radial-gradient(680px 300px at 12% 0%, rgba(8, 145, 178, 0.07), transparent 70%);
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.42) 30%,
    rgba(124, 58, 237, 0.38) 70%,
    transparent
  );
}

.hero h1 {
  color: var(--text);
  text-shadow: none;
}

.hero h1 .underline {
  background: linear-gradient(transparent 64%, rgba(8, 145, 178, 0.32) 64%);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--brand-dark);
  background: rgba(8, 145, 178, 0.07);
  border: 1px solid rgba(8, 145, 178, 0.26);
  box-shadow: inset 0 0 20px -10px var(--glow-cyan);
}

/* 左侧呼吸指示点 */
.hero-eyebrow::before {
  content: "";
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 10px var(--glow-cyan);
}

.hero-meta {
  border-top: 1px dashed rgba(8, 145, 178, 0.18);
}

.hero-stat b {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--brand-dark);
  text-shadow: none;
}

.hero-stat span {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   4. 卡片：玻璃底 + 双色角标 + 悬停辉光
   -------------------------------------------------------------------------- */

.post-card {
  overflow: hidden;
  background:
    linear-gradient(180deg, var(--fx-sheen), rgba(8, 145, 178, 0) 44%),
    var(--surface);
  transition:
    transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.24s ease,
    border-color 0.24s ease;
}

/* 左上 / 右下 的 L 形科技角标，悬停亮起 */
.post-card::before,
.post-card::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease;
}

.post-card::before {
  top: 0;
  left: 0;
  border-top: 1px solid var(--brand);
  border-left: 1px solid var(--brand);
  border-top-left-radius: var(--radius-lg);
  box-shadow: -1px -1px 12px -6px var(--glow-cyan);
}

.post-card::after {
  right: 0;
  bottom: 0;
  border-bottom: 1px solid var(--violet);
  border-right: 1px solid var(--violet);
  border-bottom-right-radius: var(--radius-lg);
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: rgba(8, 145, 178, 0.36);
  box-shadow:
    0 0 0 1px rgba(8, 145, 178, 0.08),
    0 0 34px -12px var(--glow-cyan),
    0 22px 44px -30px rgba(19, 28, 46, 0.14);
}

.post-card:hover::before,
.post-card:hover::after {
  opacity: 1;
}

.post-card:hover h3 {
  color: var(--brand-dark);
  text-shadow: none;
}

.post-card-top {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* 侧栏卡片 */
.card {
  position: relative;
  background:
    linear-gradient(180deg, rgba(8, 145, 178, 0.035), rgba(8, 145, 178, 0) 48%),
    var(--surface);
  box-shadow: var(--shadow);
}

.card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--brand-dark);
}

.card h3::before {
  content: "";
  flex-shrink: 0;
  width: 3px;
  height: 12px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), var(--violet));
  box-shadow: 0 0 10px var(--glow-cyan);
}

.side-item {
  transition: color 0.18s ease, transform 0.18s ease;
}

.side-item:hover {
  color: var(--brand-dark);
  transform: translateX(2px);
}

.side-stats {
  font-family: var(--font-mono);
}

.toc-card {
  border-left: 2px solid rgba(8, 145, 178, 0.5);
  box-shadow:
    inset 5px 0 26px -18px var(--glow-cyan),
    var(--shadow);
}

.toc-card :is(h3, h4, strong) {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand-dark);
}

.toc-card a:hover {
  color: var(--brand-dark);
  text-shadow: none;
}

/* --------------------------------------------------------------------------
   5. 标签：等宽字体 + 霓虹描边
   -------------------------------------------------------------------------- */

.tag-chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  border: 1px solid rgba(8, 145, 178, 0.16);
  background: rgba(8, 145, 178, 0.07);
  transition:
    background 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.2s ease,
    color 0.18s ease;
}

.tag-chip:hover {
  background: rgba(8, 145, 178, 0.14);
  border-color: var(--brand-ring);
  box-shadow: 0 0 16px -5px var(--glow-cyan);
}

.tag-tile {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, var(--fx-sheen), rgba(8, 145, 178, 0) 52%),
    var(--surface);
  transition:
    transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    border-color 0.22s ease,
    box-shadow 0.24s ease;
}

/* 左侧青紫竖条，静态可见、悬停点亮 */
.tag-tile::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  bottom: 13px;
  width: 2px;
  border-radius: 0 2px 2px 0;
  background: linear-gradient(180deg, var(--brand), var(--violet));
  opacity: 0.8;
  transition: opacity 0.22s ease, box-shadow 0.22s ease;
}

.tag-tile strong {
  color: var(--text);
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

/* 篇数做成青色调胶囊 */
.tag-tile .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--brand-dark);
  background: rgba(8, 145, 178, 0.1);
  border: 1px solid rgba(8, 145, 178, 0.22);
  border-radius: 999px;
  padding: 1px 9px;
}

.tag-tile:hover {
  transform: translateY(-2px);
  border-color: rgba(8, 145, 178, 0.34);
  box-shadow: 0 0 30px -12px var(--glow-cyan);
}

.tag-tile:hover::before {
  opacity: 1;
  box-shadow: 0 0 12px var(--glow-cyan);
}

.tag-tile:hover .tag-tile-name,
.tag-tile:hover strong {
  color: var(--brand-dark);
  text-shadow: none;
}

/* --------------------------------------------------------------------------
   6. 文章详情：标题竖条 + 终端化代码块
   -------------------------------------------------------------------------- */

.post-title {
  color: var(--text);
  text-shadow: none;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  border-bottom: 1px solid var(--border);
}

.back-link {
  font-family: var(--font-mono);
  font-size: 13px;
}

.back-link:hover {
  color: var(--brand-dark);
  text-shadow: none;
}

.post-cover {
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.12), 0 24px 50px -34px rgba(19, 28, 46, 0.14);
}

/* 正文 h2：左侧青紫渐变竖条 */
.post-body h2 {
  position: relative;
  padding-left: 15px;
  border-bottom-color: rgba(8, 145, 178, 0.14);
}

.post-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.35em;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), var(--violet));
  box-shadow: 0 0 12px var(--glow-cyan);
}

.post-body h3 {
  color: var(--text);
}

/* 链接：悬停发光 */
.post-body a {
  border-bottom: 1px solid rgba(8, 145, 178, 0.4);
  transition: border-color 0.18s ease, text-shadow 0.18s ease;
}

.post-body a:hover {
  border-bottom-color: var(--brand);
  text-shadow: none;
}

/* 引用块：渐变底 + 发光左条 */
.post-body blockquote {
  background: linear-gradient(
    90deg,
    rgba(8, 145, 178, 0.09),
    rgba(124, 58, 237, 0.05) 62%,
    rgba(124, 58, 237, 0) 100%
  );
  box-shadow: inset 0 0 34px -20px var(--glow-cyan);
}

/* 行内代码 */
.post-body code {
  background: rgba(180, 83, 9, 0.09);
  border-color: rgba(180, 83, 9, 0.2);
}

/* 代码块：终端窗口质感（用 inset 阴影画边框，不会被横向滚动带走） */
.post-body pre {
  background: #060b13;
  border-color: rgba(8, 145, 178, 0.14);
  box-shadow:
    inset 0 0 0 1px rgba(8, 145, 178, 0.1),
    inset 3px 0 0 rgba(8, 145, 178, 0.34),
    inset 0 1px 0 rgba(8, 145, 178, 0.2),
    inset 0 0 50px -22px rgba(8, 145, 178, 0.3),
    0 20px 44px -32px rgba(19, 28, 46, 0.14);
}

.post-body pre code {
  color: #d3e2f5;
}

.post-body pre::-webkit-scrollbar {
  height: 8px;
}

.post-body pre::-webkit-scrollbar-thumb {
  background: #1b2b45;
  border-color: #060b13;
}

/* 表格 */
.post-body table {
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.08);
}

.post-body th {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  background: rgba(8, 145, 178, 0.06);
  color: var(--brand-dark);
  border-color: rgba(8, 145, 178, 0.14);
}

.post-body td {
  border-color: var(--border);
}

.post-body tr:hover td {
  background: rgba(8, 145, 178, 0.035);
}

/* 分割线与图片 */
.post-body hr {
  border: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.34) 32%,
    rgba(124, 58, 237, 0.3) 68%,
    transparent
  );
}

.post-body img {
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.1), 0 22px 46px -32px rgba(19, 28, 46, 0.12);
}

/* --------------------------------------------------------------------------
   7. 按钮 / 表单 / 上传
   -------------------------------------------------------------------------- */

.btn {
  transition:
    background 0.18s ease,
    transform 0.12s ease,
    border-color 0.18s ease,
    box-shadow 0.22s ease;
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.18), 0 10px 26px -18px var(--glow-cyan);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.45), 0 0 28px -8px var(--glow-cyan);
}

.btn:active {
  transform: translateY(0);
}

.btn-ghost {
  background: rgba(8, 145, 178, 0.05);
  border-color: rgba(8, 145, 178, 0.2);
  color: var(--brand-dark);
  box-shadow: none;
}

.btn-ghost:hover {
  background: rgba(8, 145, 178, 0.11);
  border-color: rgba(8, 145, 178, 0.42);
  color: var(--brand-dark);
  box-shadow: 0 0 22px -8px var(--glow-cyan);
}

.btn-danger {
  background: rgba(220, 38, 38, 0.06);
  box-shadow: none;
}

.btn-danger:hover {
  background: rgba(220, 38, 38, 0.13);
  border-color: rgba(220, 38, 38, 0.55);
  box-shadow: 0 0 22px -8px rgba(220, 38, 38, 0.5);
}

.text-btn:hover {
  color: var(--brand-dark);
  text-shadow: none;
}

/* 输入类控件聚焦：青色光圈 */
.field :is(input, textarea, select):focus,
.search-bar input:focus,
.editor-toolbar input:focus {
  border-color: rgba(8, 145, 178, 0.55) !important;
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.11), inset 0 0 20px -14px var(--glow-cyan);
  outline: none;
}

.auth-card,
.about-card,
.editor-card {
  background:
    linear-gradient(180deg, var(--fx-sheen), rgba(8, 145, 178, 0) 40%),
    var(--surface);
  box-shadow: var(--shadow), 0 0 0 1px rgba(8, 145, 178, 0.06);
}

.admin-tabs button.active {
  color: var(--brand-dark);
  border-color: var(--brand);
  text-shadow: none;
}

.dropzone {
  border-color: rgba(8, 145, 178, 0.28);
  background: rgba(8, 145, 178, 0.03);
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.22s ease;
}

.dropzone:hover,
.dropzone.is-over {
  border-color: var(--brand);
  background: rgba(8, 145, 178, 0.08);
  box-shadow: inset 0 0 40px -22px var(--glow-cyan);
}

.attach-item {
  border-color: var(--border);
  transition: border-color 0.2s ease, box-shadow 0.22s ease;
}

.attach-item:hover {
  border-color: rgba(8, 145, 178, 0.34);
  box-shadow: 0 0 24px -12px var(--glow-cyan);
}

.upload-progress {
  background: rgba(8, 145, 178, 0.12);
}

.upload-progress > *,
.upload-progress-fill {
  background: linear-gradient(90deg, var(--brand), var(--violet));
  box-shadow: 0 0 14px var(--glow-cyan);
}

.preview-pane {
  background: var(--surface-sunken);
  border-color: var(--border);
}

/* 后台表格 */
.admin-table th {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  background: rgba(8, 145, 178, 0.04);
}

.admin-table tr:hover td {
  background: rgba(8, 145, 178, 0.035);
}

.side-item.is-active,
.side-item.active {
  color: var(--brand-dark);
  box-shadow: inset 2px 0 0 var(--brand);
}

/* --------------------------------------------------------------------------
   8. Toast / Loading / Footer
   -------------------------------------------------------------------------- */

.toast {
  background: var(--fx-glass-solid);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  box-shadow:
    inset 0 0 0 1px rgba(8, 145, 178, 0.3),
    0 0 30px -14px var(--glow-cyan),
    0 22px 44px -28px rgba(19, 28, 46, 0.14);
}

.toast.error {
  background: #fef2f2;
  color: #b91c1c;
  box-shadow:
    inset 0 0 0 1px rgba(220, 38, 38, 0.38),
    0 0 30px -14px rgba(220, 38, 38, 0.5),
    0 22px 44px -28px rgba(19, 28, 46, 0.14);
}

.toast.success {
  background: #ecfeff;
  color: #0e7490;
  box-shadow:
    inset 0 0 0 1px rgba(8, 145, 178, 0.4),
    0 0 30px -14px var(--glow-cyan),
    0 22px 44px -28px rgba(19, 28, 46, 0.14);
}

.spinner {
  border-color: rgba(8, 145, 178, 0.18);
  border-top-color: var(--brand);
  box-shadow: 0 0 18px -4px var(--glow-cyan);
}

.loading-block {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.site-footer {
  position: relative;
  margin-top: 40px;
  background: linear-gradient(180deg, rgba(8, 145, 178, 0.025), rgba(8, 145, 178, 0));
  border-top: 1px solid transparent;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.32) 28%,
    rgba(124, 58, 237, 0.28) 72%,
    transparent
  );
}

.footer-line strong {
  color: var(--brand-dark);
  text-shadow: none;
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.footer-meta a:hover {
  color: var(--brand-dark);
  text-shadow: none;
}

/* --------------------------------------------------------------------------
   9. 空状态 / 页头
   -------------------------------------------------------------------------- */

.empty-state {
  background:
    repeating-linear-gradient(
      135deg,
      rgba(8, 145, 178, 0.02) 0 12px,
      rgba(8, 145, 178, 0) 12px 24px
    ),
    var(--surface);
  border-color: rgba(8, 145, 178, 0.22);
}

.page-head h1 {
  color: var(--text);
  text-shadow: none;
}

.section-title h2 {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   10. 动效降级与响应式
   -------------------------------------------------------------------------- */

@media (max-width: 720px) {
  :root {
    --fx-grid-size: 34px;
  }

  .fx-scan {
    display: none;
  }

  /* 移动端竖排导航：下划线改为左侧发光条 */
  .primary-nav a::after {
    left: 0;
    right: auto;
    top: 10px;
    bottom: 10px;
    width: 2px;
    height: auto;
    transform: scaleY(0);
    transform-origin: center top;
  }

  .primary-nav a:hover::after,
  .primary-nav a.active::after {
    transform: scaleY(1);
  }

  .post-card::before,
  .post-card::after {
    display: none;
  }

  .primary-nav {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid rgba(8, 145, 178, 0.16);
  }
}

/* 低配设备降级：关掉大面积模糊 */
@media (max-width: 480px) {
  body::after {
    opacity: 0.7;
  }
}

/* --------------------------------------------------------------------------
   10.5 全屏登录页：整屏只留这一处光源，视线落到登录卡上
   -------------------------------------------------------------------------- */

.login-screen::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.42) 30%,
    rgba(124, 58, 237, 0.34) 70%,
    transparent
  );
  z-index: 2;
}

.login-card {
  position: relative;
  border-color: rgba(8, 145, 178, 0.24);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(8, 145, 178, 0.07);
}

.login-card::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(8, 145, 178, 0.45) 30%,
    rgba(124, 58, 237, 0.3) 72%,
    transparent
  );
}

.pw-toggle[aria-pressed="true"] {
  color: var(--brand-dark);
}

/* --------------------------------------------------------------------------
   11. 静态模式：全站取消动效
   装饰性动画（扫描带 / 呼吸线 / 脉冲点 / 徽章微光 / 滚动进度条）已在上方移除，
   这里兜底关掉所有残留的过渡与关键帧动画。
   想恢复动效：删掉本节即可，其余样式不受影响。
   -------------------------------------------------------------------------- */

/* 页面滚动不做平滑动画，直接定位 */
html {
  scroll-behavior: auto;
}

/* 全站过渡与动画一律瞬时完成（悬停、展开、输入等） */
*,
*::before,
*::after {
  transition-duration: 0s !important;
  transition-delay: 0s !important;
  animation-duration: 0s !important;
  animation-delay: 0s !important;
  animation-iteration-count: 1 !important;
}

/* 功能性例外：加载指示器必须转动，否则无法区分"加载中"与"卡住" */
.spinner {
  animation-duration: 0.7s !important;
  animation-iteration-count: infinite !important;
}

/* 悬停不再位移，静态布局下避免元素"跳动" */
.post-card:hover,
.tag-tile:hover,
.tile:hover,
.btn:hover,
.btn:active,
.side-item:hover,
.related-item:hover,
.attach-item:hover,
.pagination button:hover:not(:disabled) {
  transform: none;
}

/* 移动端菜单改为瞬时开合 */
.primary-nav,
body.nav-open .primary-nav {
  transform: none;
}