@import url("../../assets/fonts/xiangkaile-wenkai/font.css");

* { margin: 0; padding: 0; box-sizing: border-box; }
  html {
    --xk-body-size: 14.5px;
    --xk-meta-size: 11.5px;
    --xk-label-size: 11px;
  }
  html[data-text-size="large"] {
    --xk-body-size: 16px;
    --xk-meta-size: 12.5px;
    --xk-label-size: 12px;
  }
  html, body, #root {
    height: 100%;
    width: 100%;
    overflow: hidden;
    background: #F4F5F2;
  }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", sans-serif;
    font-weight: 400;
    /* iOS 安全区：只给顶部和左右留；底部交给 TabBar 自己吃 inset，
       避免 body padding 把 TabBar 挤到屏幕底上方留出一条黑框 */
    padding-top: env(safe-area-inset-top);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
  /* iOS zooms focused form controls whose rendered text is below 16px. Keep
     native pinch zoom available while preventing that automatic jump. */
  @supports (-webkit-touch-callout: none) {
    input, textarea, select { font-size: 16px !important; }
  }
  button, input, textarea, select { font-family: inherit; }
  button:focus:not(:focus-visible) { outline: none; }
  button:focus-visible,
  input:focus-visible,
  textarea:focus-visible,
  select:focus-visible,
  a[href]:focus-visible,
  [tabindex]:focus-visible {
    outline: 2px solid #557F88 !important;
    outline-offset: 2px;
  }
  button { -webkit-tap-highlight-color: transparent; }
  .theme-choice:focus-visible { outline: 2px solid #7898AA; outline-offset: 2px; }
  .tap-soft { transition: transform 160ms ease, opacity 160ms ease; }
  .tap-soft:active { transform: scale(0.985); opacity: 0.92; }
  .tap-row { transition: opacity 140ms ease; }
  .tap-row:active { opacity: 0.62; }
  .tap-node { transition: transform 140ms ease; }
  .tap-node:active { transform: scale(0.96); }
  .xk-body { font-size: var(--xk-body-size) !important; }
  .xk-meta { font-size: var(--xk-meta-size) !important; }
  .xk-label { font-size: var(--xk-label-size) !important; }

  .app-tab-button .app-tab-icon {
    transition: transform 160ms ease, opacity 160ms ease;
  }
  .app-tab-button:active .app-tab-icon {
    transform: scale(0.92);
    opacity: 0.72;
  }
  .app-tab-indicator {
    width: 16px;
    height: 2px;
    margin-top: 1px;
    border-radius: 1px;
    opacity: 0;
    transform: scaleX(0.45);
    transition: opacity 180ms ease, transform 180ms ease;
  }
  .app-tab-button.is-active .app-tab-indicator {
    opacity: 0.88;
    transform: scaleX(1);
  }

  .companion-disclosure > summary {
    list-style: none;
  }
  .companion-disclosure > summary::-webkit-details-marker {
    display: none;
  }
  .companion-disclosure > summary:focus-visible {
    outline: 2px solid #7898AA;
    outline-offset: 2px;
  }

  .archive-empty-steps {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  .archive-page[data-empty="true"] .archive-page-header,
  .archive-empty-journey {
    width: 100%;
    max-width: 620px;
    margin-inline: auto;
  }
  .archive-empty-intro {
    padding: 0 0 17px;
  }
  .archive-empty-steps li {
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    align-items: center;
    min-height: 54px;
    padding: 7px 2px;
  }
  .archive-empty-steps li:last-child {
    border-bottom: 0 !important;
  }
  .archive-empty-step-number {
    align-self: center;
    font-size: var(--xk-label-size);
    font-weight: 650;
  }
  .archive-empty-steps li > span:last-child {
    display: grid;
    grid-template-columns: minmax(48px, auto) minmax(0, 1fr);
    align-items: baseline;
    gap: 10px;
  }
  .archive-empty-steps strong,
  .archive-empty-steps small {
    display: block;
  }
  .archive-empty-steps strong {
    font-size: calc(var(--xk-body-size) + 0.5px);
    line-height: 1.4;
  }
  .archive-empty-steps small {
    margin-top: 0;
    font-size: var(--xk-meta-size);
    line-height: 1.45;
  }
  .archive-empty-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1px;
    padding: 15px 0 0;
  }
  .archive-empty-primary,
  .archive-empty-secondary {
    width: 100%;
  }
  .archive-empty-secondary span {
    display: inline-block;
    margin-left: 3px;
    transition: transform 160ms ease;
  }
  .archive-empty-secondary:active span {
    transform: translateX(2px);
  }

  .archive-insights {
    width: 100%;
    max-width: 620px;
    margin: 0 auto 30px;
    padding: 0 20px;
  }
  .archive-insight-lead {
    padding: 16px 15px 14px;
    border-radius: 8px;
  }
  .archive-insight-lead .editorial-kicker {
    margin: 0 0 6px;
    color: var(--archive-insight-primary);
  }
  .archive-insight-lead h2 {
    margin: 0;
    color: var(--archive-insight-text);
    font-size: 20px;
    font-weight: 600;
    line-height: 1.48;
    overflow-wrap: anywhere;
  }
  .archive-insight-lead-copy {
    margin: 7px 0 0;
    color: var(--archive-insight-secondary);
    font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
    font-size: var(--xk-body-size);
    line-height: 1.7;
  }
  .archive-insight-basis {
    margin: 8px 0 13px;
    color: var(--archive-insight-muted);
    font-size: var(--xk-meta-size);
    line-height: 1.5;
  }
  .archive-insight-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--archive-insight-border);
  }
  .archive-insight-stats > span {
    min-width: 0;
    padding: 11px 4px 0;
    border-right: 1px solid var(--archive-insight-border);
    text-align: center;
  }
  .archive-insight-stats > span:last-child {
    border-right: 0;
  }
  .archive-insight-stats strong,
  .archive-insight-stats small {
    display: block;
  }
  .archive-insight-stats strong {
    color: var(--archive-insight-text);
    font-size: 18px;
    font-weight: 650;
    line-height: 1.2;
  }
  .archive-insight-stats small {
    margin-top: 3px;
    color: var(--archive-insight-muted);
    font-size: var(--xk-label-size);
    line-height: 1.35;
    overflow-wrap: anywhere;
  }
  .archive-insight-section {
    margin-top: 28px;
  }
  .archive-insight-section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 7px;
  }
  .archive-insight-section-head h3 {
    margin: 0;
    color: var(--archive-insight-text);
    font-size: 19px;
    font-weight: 600;
    line-height: 1.45;
  }
  .archive-insight-section-head > span {
    flex-shrink: 0;
    color: var(--archive-insight-muted);
    font-size: var(--xk-label-size);
  }
  .archive-insight-intro {
    margin: 0 0 12px;
    color: var(--archive-insight-secondary);
    font-size: var(--xk-meta-size);
    line-height: 1.55;
  }
  .archive-significant-list,
  .archive-category-list {
    border-top: 1px solid var(--archive-insight-border);
  }
  .archive-significant-item,
  .archive-category-item {
    border-bottom: 1px solid var(--archive-insight-border);
  }
  .archive-significant-item > summary,
  .archive-category-item > summary {
    min-height: 44px;
    list-style: none;
    cursor: pointer;
  }
  .archive-significant-item > summary::-webkit-details-marker,
  .archive-category-item > summary::-webkit-details-marker {
    display: none;
  }
  .archive-significant-item > summary {
    display: block;
    padding: 14px 0 13px;
  }
  .archive-significant-meta {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 7px;
    color: var(--archive-insight-muted);
    font-size: var(--xk-meta-size);
  }
  .archive-significant-meta > strong {
    margin-left: auto;
    color: var(--archive-insight-delta);
    font-size: var(--xk-meta-size);
    font-weight: 700;
  }
  .archive-insight-tag {
    padding: 2px 6px;
    border-radius: 2px;
    background: var(--archive-insight-tag-soft);
    color: var(--archive-insight-tag);
    font-size: var(--xk-label-size);
    font-weight: 700;
  }
  .archive-significant-title-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
  }
  .archive-significant-title-row > .font-letter {
    min-width: 0;
    color: var(--archive-insight-text);
    font-size: var(--xk-body-size);
    line-height: 1.6;
    overflow-wrap: anywhere;
  }
  .archive-significant-score {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--archive-insight-secondary);
    font-size: var(--xk-meta-size);
    white-space: nowrap;
  }
  .archive-significant-score strong {
    color: var(--archive-insight-text);
    font-size: 14px;
  }
  .archive-significant-detail {
    margin: 0 0 14px;
    padding: 1px 0 0 12px;
    border-left: 2px solid var(--archive-insight-delta);
  }
  .archive-significant-detail > p {
    margin: 0;
    color: var(--archive-insight-secondary);
    font-size: 13.5px;
    line-height: 1.72;
    overflow-wrap: anywhere;
  }
  .archive-significant-detail > div {
    display: flex;
    min-height: 44px;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 5px;
  }
  .archive-significant-detail small {
    color: var(--archive-insight-muted);
    font-size: var(--xk-label-size);
    line-height: 1.4;
  }
  .archive-significant-detail button {
    min-width: 92px;
    min-height: 44px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--archive-insight-primary);
    font-size: var(--xk-meta-size);
    font-weight: 600;
    text-align: right;
    cursor: pointer;
  }
  .archive-category-item > summary {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 18px;
    align-items: center;
    gap: 9px;
    padding: 14px 0;
  }
  .archive-category-name {
    color: var(--archive-insight-tag);
    font-size: 13px;
    font-weight: 700;
  }
  .archive-category-summary {
    min-width: 0;
  }
  .archive-category-summary strong,
  .archive-category-summary small {
    display: block;
    overflow-wrap: anywhere;
  }
  .archive-category-summary strong {
    color: var(--archive-insight-text);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.48;
  }
  .archive-category-summary small {
    margin-top: 3px;
    color: var(--archive-insight-muted);
    font-size: var(--xk-label-size);
    line-height: 1.4;
  }
  .archive-category-chevron {
    color: var(--archive-insight-muted);
    font-size: 18px;
    text-align: right;
    transition: transform 180ms ease;
  }
  .archive-category-item[open] > summary .archive-category-chevron {
    transform: rotate(90deg);
  }
  .archive-category-detail {
    padding: 0 0 15px 53px;
  }
  .archive-category-detail > p {
    margin: 0;
    color: var(--archive-insight-secondary);
    font-size: 13px;
    line-height: 1.68;
  }
  .archive-category-average {
    display: grid;
    grid-template-columns: auto minmax(42px, 1fr) auto;
    align-items: center;
    gap: 8px;
    margin-top: 9px;
    color: var(--archive-insight-muted);
    font-size: var(--xk-label-size);
  }
  .archive-category-average-line {
    height: 4px;
    overflow: hidden;
    background: rgba(126, 142, 135, 0.18);
  }
  .archive-category-average-line > span {
    display: block;
    height: 100%;
    background: var(--archive-insight-tag);
  }
  .archive-insight-note {
    margin: 22px 0 0;
    padding-top: 13px;
    border-top: 1px solid var(--archive-insight-border);
    color: var(--archive-insight-muted);
    font-size: var(--xk-meta-size);
    line-height: 1.6;
  }
  .archive-all-records-heading {
    display: flex;
    max-width: 620px;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin: 0 auto 4px;
  }
  .archive-all-records-heading h2 {
    margin: 0;
    font-size: 19px;
    font-weight: 600;
    line-height: 1.45;
  }
  .archive-all-records-heading span {
    font-size: var(--xk-label-size);
  }

  .archive-detail-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 16px;
    padding-top: 13px;
  }
  .archive-trend-overview {
    margin-bottom: 26px;
    padding: 15px 0 0;
  }
  .archive-trend-conclusion {
    margin: 0 0 15px;
    color: var(--archive-page-text);
    font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
    font-size: calc(var(--xk-body-size) + 2px);
    font-weight: 600;
    line-height: 1.55;
  }
  .archive-mood-comparison {
    display: grid;
    grid-template-columns: minmax(52px, auto) minmax(86px, 1fr) minmax(52px, auto);
    align-items: center;
    gap: 10px;
    padding: 0 0 14px;
  }
  .archive-mood-point {
    min-width: 0;
  }
  .archive-mood-point span {
    display: block;
    margin-bottom: 2px;
    color: var(--archive-page-muted);
    font-size: var(--xk-meta-size);
  }
  .archive-mood-point strong {
    display: block;
    color: var(--archive-page-text);
    font-size: 24px;
    font-weight: 650;
    line-height: 1.15;
  }
  .archive-mood-point strong small {
    margin-left: 2px;
    color: var(--archive-page-secondary);
    font-size: var(--xk-label-size);
    font-weight: 500;
  }
  .archive-mood-point-now {
    text-align: right;
  }
  .archive-mood-direction {
    min-width: 0;
    color: var(--archive-page-muted);
    text-align: center;
  }
  .archive-mood-direction-line {
    position: relative;
    display: block;
    width: 100%;
    height: 1px;
    margin-bottom: 7px;
    background: currentColor;
  }
  .archive-mood-direction-line::after {
    content: "";
    position: absolute;
    top: -3px;
    right: 0;
    width: 6px;
    height: 6px;
    border-top: 1px solid currentColor;
    border-right: 1px solid currentColor;
    transform: rotate(45deg);
  }
  .archive-mood-direction small {
    display: block;
    overflow-wrap: anywhere;
    color: currentColor;
    font-size: var(--xk-label-size);
    line-height: 1.35;
  }
  .archive-mood-direction.is-easier { color: #2E7D70; }
  .archive-mood-direction.is-heavier { color: #C86145; }
  .archive-mood-direction.is-same,
  .archive-mood-direction.is-pending { color: var(--archive-page-muted); }
  .archive-update-mood-button {
    display: flex;
    width: 100%;
    min-height: 44px;
    align-items: center;
    justify-content: space-between;
    padding: 11px 0;
    border: 0;
    border-top: 1px solid rgba(126, 142, 135, 0.22);
    background: transparent;
    color: var(--archive-page-secondary);
    font-size: 13px;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
  }
  .archive-update-mood-button span {
    color: var(--archive-page-muted);
    font-size: 20px;
    font-weight: 400;
  }
  .archive-timeline-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin: 0 0 20px;
  }
  .archive-timeline-heading h2 {
    margin: 0;
    color: var(--archive-page-text);
    font-size: 22px;
    font-weight: 400;
  }
  .archive-timeline-heading span {
    color: var(--archive-page-muted);
    font-size: var(--xk-meta-size);
    text-align: right;
  }
  .archive-timeline {
    position: relative;
  }
  .archive-timeline-event {
    --archive-timeline-tone: #84918C;
    position: relative;
    min-width: 0;
    padding: 0 0 25px 32px;
  }
  .archive-timeline-event.archive-timeline-last {
    padding-bottom: 2px;
  }
  .archive-timeline-rail {
    position: absolute;
    top: 13px;
    bottom: -1px;
    left: 7px;
    width: 1px;
    overflow: hidden;
    background: rgba(126, 142, 135, 0.24);
  }
  .archive-timeline-rail-progress {
    display: block;
    width: 100%;
    height: 0;
    background: var(--archive-timeline-tone);
    transition: height 520ms ease;
  }
  .archive-timeline-past .archive-timeline-rail-progress {
    height: 100%;
  }
  .archive-timeline-current .archive-timeline-rail-progress {
    height: 38%;
    animation: archiveTimelineFlow 2.8s ease-in-out infinite;
  }
  .archive-timeline-node {
    position: absolute;
    top: 4px;
    left: 1px;
    z-index: 1;
    width: 13px;
    height: 13px;
    border: 2px solid var(--archive-timeline-tone);
    border-radius: 50%;
    background: var(--archive-page-bg);
    box-shadow: 0 0 0 4px var(--archive-page-bg);
  }
  .archive-timeline-past .archive-timeline-node {
    background: var(--archive-timeline-tone);
  }
  .archive-timeline-current .archive-timeline-node::after {
    content: "";
    position: absolute;
    inset: -6px;
    border: 1px solid var(--archive-timeline-tone);
    border-radius: 50%;
    animation: archiveTimelinePulse 2.4s ease-out infinite;
  }
  .archive-timeline-future .archive-timeline-node {
    border-color: rgba(126, 142, 135, 0.5);
  }
  .archive-timeline-eyebrow {
    margin: 0 0 4px;
    color: var(--archive-timeline-tone);
    font-size: var(--xk-meta-size);
    font-weight: 600;
  }
  .archive-timeline-future .archive-timeline-eyebrow {
    color: var(--archive-page-muted);
  }
  .archive-timeline-title {
    margin: 0;
    color: var(--archive-page-text);
    font-size: calc(var(--xk-body-size) + 1.5px);
    font-weight: 600;
    line-height: 1.45;
  }
  .archive-timeline-content {
    min-width: 0;
    margin-top: 7px;
  }
  .archive-perspective-tools {
    margin: 26px 0 0 32px;
    padding: 15px 0 0;
  }
  .archive-perspective-tools-heading p {
    margin: 0 0 3px;
    color: var(--archive-page-text);
    font-size: var(--xk-body-size);
    font-weight: 600;
  }
  .archive-perspective-tools-heading span {
    display: block;
    color: var(--archive-page-muted);
    font-size: var(--xk-meta-size);
    line-height: 1.45;
  }
  .archive-perspective-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 11px;
  }
  .archive-perspective-actions button {
    min-width: 0;
    min-height: 52px;
    padding: 8px 5px;
    border: 0;
    border-right: 1px solid rgba(126, 142, 135, 0.22);
    background: transparent;
    color: var(--archive-page-secondary);
    text-align: center;
    cursor: pointer;
  }
  .archive-perspective-actions button:last-child {
    border-right: 0;
  }
  .archive-perspective-actions button span,
  .archive-perspective-actions button small {
    display: block;
    overflow-wrap: anywhere;
  }
  .archive-perspective-actions button span {
    font-size: 13px;
    font-weight: 600;
  }
  .archive-perspective-actions button small {
    margin-top: 2px;
    color: var(--archive-page-muted);
    font-size: var(--xk-label-size);
    line-height: 1.35;
  }
  @keyframes archiveTimelinePulse {
    0% { transform: scale(0.72); opacity: 0.5; }
    72%, 100% { transform: scale(1.45); opacity: 0; }
  }
  @keyframes archiveTimelineFlow {
    0%, 100% { opacity: 0.45; }
    50% { opacity: 1; }
  }

  /* iOS keyboard animation is GPU-bound. The dimmed layers do not need live
     backdrop sampling while the compose sheet is open. */
  html.compose-performance-mode .mailbox-sticky-nav {
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
  }
  html.compose-performance-mode .app-tab-bar {
    visibility: hidden !important;
    pointer-events: none !important;
  }

  /* The native keyboard overlays WKWebView. While replying, remove the fixed
     tab bar from the touch/paint path so the editor owns the visible area. */
  html.reply-keyboard-open .app-tab-bar,
  html.identity-modal-open .app-tab-bar {
    visibility: hidden !important;
    pointer-events: none !important;
  }
  html.reply-keyboard-open .mailbox-sticky-nav {
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
  }

  /* Natural glass: restrained daylight, mist and refraction on hero surfaces. */
  .nature-glass {
    --nature-mist: var(--xk-nature-mist, rgba(255, 255, 255, 0.03));
    --nature-glint: var(--xk-nature-glint, rgba(255, 255, 255, 0.07));
    isolation: isolate;
  }
  .nature-glass-forest {
    --nature-mist: var(--xk-nature-mist, rgba(143, 197, 181, 0.055));
    --nature-glint: var(--xk-nature-glint, rgba(222, 237, 231, 0.075));
  }
  .nature-glass-night {
    --nature-mist: var(--xk-nature-mist, rgba(142, 183, 192, 0.05));
    --nature-glint: var(--xk-nature-glint, rgba(232, 240, 238, 0.065));
  }
  .nature-glass::before,
  .nature-glass::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
  }
  .nature-glass::before {
    z-index: 1;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.075), transparent 22%),
      linear-gradient(0deg, var(--nature-mist), transparent 44%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.10);
  }
  .nature-glass::after {
    z-index: 2;
    left: -46%;
    right: auto;
    width: 26%;
    background: linear-gradient(100deg, transparent, var(--nature-glint), transparent);
    transform: skewX(-12deg);
    animation: naturalGlassLight 15s ease-in-out infinite;
  }
  @keyframes naturalGlassLight {
    0%, 18% { transform: translateX(0) skewX(-12deg); opacity: 0; }
    30% { opacity: 0.72; }
    58% { transform: translateX(580%) skewX(-12deg); opacity: 0; }
    100% { transform: translateX(580%) skewX(-12deg); opacity: 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    .tap-soft, .tap-row, .tap-node, .mailbox-paper-item,
    .app-tab-button .app-tab-icon, .app-tab-indicator { transition: none; }
    .stagger-item, .mailbox-skeleton-line,
    .archive-timeline-current .archive-timeline-node::after,
    .archive-timeline-current .archive-timeline-rail-progress { animation: none !important; }
    .nature-glass::after { animation: none; display: none; }
    .home-plane-route { animation: none !important; }
  }
  .brand-type {
    font-family: "Xiangkaile WenKai", "Kaiti SC", "STKaiti", "Songti SC", serif;
    font-weight: 400;
    font-synthesis: none;
    letter-spacing: 0;
  }
  .soft-title {
    font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
    font-weight: 600;
    font-synthesis: none;
    letter-spacing: 0;
  }
  .editorial-kicker {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
    font-size: var(--xk-label-size);
    font-weight: 600;
    letter-spacing: 0;
    text-transform: uppercase;
  }
  .hairline-button {
    -webkit-appearance: none;
    appearance: none;
    border: 0;
    border-radius: 0;
    background: transparent;
  }
  .page-scroll {
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .page-scroll::-webkit-scrollbar { display: none; }
  /* 信件腔字体 class —— 在需要"读信"感的元素上加 className="font-letter" */
  .font-letter, .font-letter * {
    font-family: "Xiangkaile WenKai", "Kaiti SC", "STKaiti", "Songti SC", serif !important;
    font-weight: 400;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .ugc-content {
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .mailbox-paper-item {
    -webkit-tap-highlight-color: transparent;
    transform: translateZ(0);
    transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
  }
  .mailbox-paper-item:active {
    transform: scale(0.994) translateZ(0);
  }
  .stagger-item {
    animation: slideUp 0.28s ease var(--stagger-delay, 0s) both;
  }
  .mailbox-skeleton {
    padding: 8px 0 2px;
  }
  .mailbox-skeleton-sheet {
    padding: 15px 14px;
    margin-bottom: 10px;
    border: 1px solid var(--xk-paper-border, rgba(123, 139, 132, 0.14));
    border-left-width: 2px;
    border-radius: 7px;
    background: var(--xk-paper-surface, rgba(255, 255, 255, 0.28));
    box-shadow: var(--xk-paper-shadow, none);
  }
  .mailbox-skeleton-line {
    height: 9px;
    margin-top: 9px;
    border-radius: 3px;
    background: rgba(123, 139, 132, 0.13);
    animation: skeletonBreath 1.35s ease-in-out infinite;
  }
  .mailbox-skeleton-line:first-child { margin-top: 0; width: 31%; }
  .mailbox-skeleton-line:nth-child(2) { width: 92%; }
  .mailbox-skeleton-line:nth-child(3) { width: 66%; }
  .mailbox-sticky-nav,
  .mailbox-detail-header,
  .mailbox-header-tools,
  .mailbox-control-glass,
  .app-tab-bar {
    isolation: isolate;
    backface-visibility: hidden;
  }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  @keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
  @keyframes pulse { 0%, 100% { transform: scale(1); opacity: 0.5; } 50% { transform: scale(1.5); opacity: 0; } }
  @keyframes skeletonBreath { 0%, 100% { opacity: 0.45; } 50% { opacity: 0.9; } }

  /* High-end editorial system: quiet hierarchy, compact glass and consistent type. */
  :root {
    --xk-font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", sans-serif;
    --xk-font-display: "Xiangkaile WenKai", "Kaiti SC", "STKaiti", "Songti SC", serif;
    --xk-motion-out: cubic-bezier(0.22, 0.78, 0.24, 1);
    --xk-content-max: 720px;
  }
  body {
    font-family: var(--xk-font-ui);
    line-height: 1.5;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1;
  }
  .app-theme-root {
    isolation: isolate;
  }
  .xk-page {
    width: 100%;
    max-width: calc(var(--xk-content-max) + 40px);
    margin-inline: auto;
    overscroll-behavior-y: contain;
  }
  .xk-page-header,
  .xk-page-content {
    width: 100%;
    max-width: var(--xk-content-max);
    margin-inline: auto;
  }
  .brand-type,
  .soft-title {
    font-family: var(--xk-font-display);
    font-synthesis: none;
    letter-spacing: 0;
  }
  .soft-title {
    font-weight: 500;
    text-wrap: balance;
  }
  .font-letter {
    text-wrap: pretty;
  }
  .xk-page-title {
    text-wrap: balance;
  }
  .editorial-kicker {
    font-family: var(--xk-font-ui);
    font-weight: 650;
    text-transform: none;
  }
  .tap-soft,
  .tap-node,
  .app-tab-button .app-tab-icon,
  .app-tab-indicator,
  .mailbox-paper-item {
    transition-timing-function: var(--xk-motion-out);
  }
  .xk-home-header {
    padding-top: 42px !important;
  }
  .xk-home-hero {
    padding-top: 10px !important;
  }
  .xk-home-hero > p:first-child {
    margin-bottom: 10px !important;
  }
  .xk-primary-action {
    min-height: 62px !important;
    box-shadow: var(--xk-glass-shadow-soft, 0 12px 30px rgba(31, 44, 39, 0.08));
  }
  .xk-primary-action > span:last-child {
    width: 40px !important;
    height: 40px !important;
  }
  .xk-home-shortcuts {
    margin-top: 18px !important;
  }
  .xk-editorial-section,
  .xk-perspective-section,
  .xk-observation-section {
    margin-top: 26px !important;
  }
  .xk-perspective-card {
    height: 184px !important;
  }
  .xk-observation-card {
    height: 158px !important;
  }
  .mailbox-header-tools {
    border-radius: 8px !important;
  }
  .mailbox-sticky-nav {
    top: 6px !important;
    width: calc(100% - 16px);
    max-width: calc(var(--xk-content-max) + 24px);
    margin: 0 auto 6px;
    border-radius: 8px !important;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(28, 41, 36, 0.08) !important;
  }
  .mailbox-sticky-nav nav button {
    transition: color 180ms var(--xk-motion-out), border-color 180ms var(--xk-motion-out) !important;
  }
  .archive-page-header {
    padding-top: 42px !important;
  }
  .xk-profile-content {
    padding-top: 42px !important;
  }
  .xk-settings-group {
    margin-bottom: 28px !important;
  }
  .xk-settings-row {
    min-height: 64px !important;
    transition: opacity 140ms var(--xk-motion-out), transform 140ms var(--xk-motion-out);
  }
  .xk-settings-row:active {
    transform: translateX(2px);
  }
  .theme-choice,
  .profile-text-size-control {
    transition-timing-function: var(--xk-motion-out) !important;
  }
  .app-tab-bar {
    left: 50% !important;
    right: auto !important;
    width: min(calc(100% - 16px), var(--xk-content-max));
    transform: translateX(-50%);
    border-radius: 18px !important;
    box-shadow: 0 14px 36px rgba(23, 36, 31, 0.13), inset 0 1px 0 rgba(255, 255, 255, 0.16) !important;
  }
  @media (min-width: 960px) {
    .xk-page.home-page {
      max-width: 1160px;
    }
    .xk-home-header,
    .xk-home-content {
      width: calc(100% - 64px);
      max-width: 1080px;
    }
    .xk-home-header {
      padding: 54px 0 28px !important;
    }
    .xk-home-content {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
      grid-template-areas:
        "returning returning"
        "hero editorial"
        "shortcuts editorial"
        "perspective observation"
        "later later";
      column-gap: 52px;
      align-items: start;
      padding: 0 0 72px !important;
    }
    .xk-home-returning {
      grid-area: returning;
      margin-bottom: 32px !important;
    }
    .xk-home-hero {
      grid-area: hero;
      padding-top: 16px !important;
    }
    .xk-home-question {
      max-width: 470px !important;
      margin-bottom: 24px !important;
      font-size: 34px !important;
      line-height: 1.36 !important;
    }
    .xk-primary-action {
      min-height: 76px !important;
      padding: 10px 12px 10px 20px !important;
    }
    .xk-primary-action > span:last-child {
      width: 46px !important;
      height: 46px !important;
    }
    .xk-home-shortcuts {
      grid-area: shortcuts;
      margin-top: 22px !important;
    }
    .xk-editorial-section {
      grid-area: editorial;
      margin-top: 0 !important;
      padding-top: 16px;
    }
    .xk-editorial-card {
      min-height: 198px;
      align-items: flex-start !important;
      padding: 22px 2px !important;
    }
    .xk-editorial-card .font-letter {
      font-size: 15px !important;
      line-height: 1.78 !important;
      -webkit-line-clamp: 4 !important;
    }
    .xk-perspective-section {
      grid-area: perspective;
      margin-top: 42px !important;
    }
    .xk-observation-section {
      grid-area: observation;
      margin-top: 42px !important;
    }
    .xk-perspective-card,
    .xk-observation-card {
      height: 210px !important;
    }
    .xk-later-section {
      grid-area: later;
      margin-top: 46px !important;
    }
    .xk-later-card {
      display: grid !important;
      grid-template-columns: 170px minmax(0, 1fr) auto;
      align-items: center;
      gap: 28px;
      padding: 22px 4px 22px 18px !important;
    }
    .xk-later-card > p {
      margin: 0 !important;
      font-size: 15px !important;
    }
    .xk-later-card > span:last-child {
      white-space: nowrap;
    }
  }
  @media (max-width: 420px) {
    .xk-home-header,
    .archive-page-header,
    .xk-profile-content {
      padding-top: 38px !important;
    }
    .xk-editorial-section,
    .xk-perspective-section,
    .xk-observation-section {
      margin-top: 22px !important;
    }
  }