:root {
  color-scheme: light;
  --telecat-page-width: 1160px;
  --telecat-page-padding: clamp(12px, 2vw, 24px);
  --telecat-surface-border: rgb(var(--mdui-color-outline-variant) / 0.72);
  --telecat-radius-xl: 32px;
  --telecat-radius-lg: 24px;
  --telecat-radius-md: 20px;
  --telecat-title-font: "Google Sans Display", "Avenir Next", "Noto Sans SC", "PingFang SC", sans-serif;
  --telecat-body-font: "Google Sans Text", "IBM Plex Sans", "Noto Sans SC", "PingFang SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: rgb(var(--mdui-color-surface-container-lowest));
  color: rgb(var(--mdui-color-on-background));
  font-family: var(--telecat-body-font);
}

mdui-layout,
mdui-layout-main {
  min-height: 100vh;
}

mdui-text-field {
  width: 100%;
}

[hidden] {
  display: none !important;
}

.ui-icon {
  width: 20px;
  height: 20px;
  color: inherit;
}

/* 视觉策略：保持 Gmail / Keep / Files / Photos 一类 Google 工具应用的低噪音秩序。
 * 这里只保留 MD3 的 surface、typescale、shape 和明确的信息分层，不再堆叠展示型背景与重阴影。 */
.surface-card {
  background: rgb(var(--mdui-color-surface));
  border: 1px solid var(--telecat-surface-border);
  border-radius: var(--telecat-radius-xl);
  box-shadow: none;
}

.app-layout {
  color: rgb(var(--mdui-color-on-background));
}

.top-app-bar {
  --mdui-color-surface: var(--mdui-color-surface-container-lowest);
  border-bottom: 1px solid rgb(var(--mdui-color-outline-variant) / 0.56);
}

.top-bar-headline {
  display: grid;
  gap: 1px;
}

.top-bar-title {
  font-family: var(--telecat-title-font);
  font-size: var(--mdui-typescale-title-medium-size);
  font-weight: var(--mdui-typescale-title-medium-weight);
  letter-spacing: var(--mdui-typescale-title-medium-tracking);
  line-height: var(--mdui-typescale-title-medium-line-height);
}

.top-bar-subtitle {
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: var(--mdui-typescale-body-small-size);
  line-height: var(--mdui-typescale-body-small-line-height);
}

.top-bar-spacer {
  flex: 1 1 auto;
}

.top-bar-end {
  display: flex;
  align-items: center;
  gap: 12px;
}

#open-drawer-button {
  margin-inline-start: -6px;
}

.nav-drawer {
  --mdui-color-surface: var(--mdui-color-surface-container-lowest);
}

.drawer-shell {
  display: grid;
  gap: 18px;
  min-height: 100%;
  padding:
    calc(18px + env(safe-area-inset-top))
    16px
    calc(24px + env(safe-area-inset-bottom));
  background: rgb(var(--mdui-color-surface-container-lowest));
}

.drawer-brand {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 8px 8px 0;
}

.drawer-brand-mark {
  width: 12px;
  height: 12px;
  margin-top: 10px;
  border-radius: 999px;
  background: rgb(var(--mdui-color-primary));
}

.drawer-brand-copy h1,
.auth-card h2,
.pane-title,
.empty-state-title {
  margin: 0;
  font-family: var(--telecat-title-font);
}

.drawer-brand-copy h1 {
  font-size: var(--mdui-typescale-title-medium-size);
  font-weight: var(--mdui-typescale-title-medium-weight);
  line-height: var(--mdui-typescale-title-medium-line-height);
}

.drawer-brand-copy p,
.status-list dt,
.drawer-section p,
.auth-card p,
.auth-note,
.pane-description,
.message-time,
.attachment-summary,
.upload-meta {
  margin: 0;
  color: rgb(var(--mdui-color-on-surface-variant));
}

.drawer-brand-copy p {
  margin-top: 2px;
  font-size: var(--mdui-typescale-body-small-size);
  line-height: var(--mdui-typescale-body-small-line-height);
}

.drawer-nav {
  background: transparent;
}

.drawer-nav mdui-list-item {
  --shape-corner-rounded: var(--mdui-shape-corner-large);
}

.drawer-section {
  display: grid;
  gap: 12px;
  padding: 16px 18px;
}

.drawer-section-title,
.page-eyebrow,
.message-kind {
  margin: 0;
  color: rgb(var(--mdui-color-on-surface-variant));
  font-size: var(--mdui-typescale-label-medium-size);
  font-weight: var(--mdui-typescale-label-medium-weight);
  letter-spacing: 0.08em;
  line-height: var(--mdui-typescale-label-medium-line-height);
  text-transform: uppercase;
}

.status-list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.status-list div {
  display: grid;
  gap: 4px;
}

.status-list dt {
  font-size: var(--mdui-typescale-body-small-size);
}

.status-list dd {
  margin: 0;
  color: rgb(var(--mdui-color-on-surface));
  font-size: var(--mdui-typescale-title-small-size);
  font-weight: var(--mdui-typescale-title-small-weight);
  line-height: var(--mdui-typescale-title-small-line-height);
}

.drawer-actions {
  display: grid;
  gap: 12px;
}

.layout-main {
  padding-bottom: env(safe-area-inset-bottom);
}

.page-shell {
  display: grid;
  gap: 16px;
  width: min(var(--telecat-page-width), calc(100vw - 2 * var(--telecat-page-padding)));
  margin: 0 auto;
  padding:
    calc(16px + env(safe-area-inset-top))
    0
    calc(24px + env(safe-area-inset-bottom));
}

.auth-panel {
  min-height: calc(100vh - 160px);
  display: grid;
  place-items: center;
}

.auth-card {
  width: min(560px, 100%);
  display: grid;
  gap: 16px;
  padding: 28px;
  background: rgb(var(--mdui-color-surface));
}

.auth-card h2 {
  font-size: var(--mdui-typescale-headline-small-size);
  font-weight: var(--mdui-typescale-headline-small-weight);
  line-height: var(--mdui-typescale-headline-small-line-height);
  letter-spacing: var(--mdui-typescale-headline-small-tracking);
}

.auth-form {
  display: grid;
  gap: 16px;
}

.auth-note {
  padding: 14px 16px;
  border-radius: var(--telecat-radius-md);
  background: rgb(var(--mdui-color-secondary-container));
  color: rgb(var(--mdui-color-on-secondary-container));
  line-height: var(--mdui-typescale-body-large-line-height);
}

.chat-app {
  display: grid;
  gap: 14px;
}

.timeline-surface {
  display: grid;
  gap: 14px;
  min-height: 460px;
  padding: 16px 18px 18px;
  background: rgb(var(--mdui-color-surface));
}

.pane-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  padding: 4px 4px 0;
}

.pane-title {
  margin-top: 6px;
  font-size: var(--mdui-typescale-headline-small-size);
  font-weight: var(--mdui-typescale-headline-small-weight);
  line-height: var(--mdui-typescale-headline-small-line-height);
  letter-spacing: var(--mdui-typescale-headline-small-tracking);
}

.pane-description {
  margin-top: 6px;
  max-width: 64ch;
  font-size: var(--mdui-typescale-body-medium-size);
  line-height: var(--mdui-typescale-body-medium-line-height);
}

.content-toolbar {
  padding: 0 4px 12px;
  border-bottom: 1px solid rgb(var(--mdui-color-outline-variant) / 0.52);
}

.toolbar-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
}

.toolbar-overview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#message-filter {
  max-width: 100%;
}

/* 主内容区采用按日期分组的资料流，而不是聊天气泡。
 * 这样更接近 Gmail / Files / Photos 的浏览模式，强调归档和阅读。 */
.message-list {
  display: grid;
  gap: 18px;
  min-height: 320px;
  max-height: min(66vh, 920px);
  overflow-y: auto;
  padding: 2px 4px 4px;
}

.message-list::-webkit-scrollbar {
  width: 8px;
}

.message-list::-webkit-scrollbar-thumb {
  background: rgb(var(--mdui-color-outline-variant));
  border-radius: 999px;
}

.day-group {
  display: grid;
  gap: 10px;
}

.day-divider {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 2px 0;
  background: linear-gradient(
    180deg,
    rgb(var(--mdui-color-surface)) 74%,
    rgb(var(--mdui-color-surface) / 0) 100%
  );
}

.day-divider span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgb(var(--mdui-color-secondary-container));
  color: rgb(var(--mdui-color-on-secondary-container));
  font-size: var(--mdui-typescale-label-medium-size);
  font-weight: var(--mdui-typescale-label-medium-weight);
}

.day-message-list {
  display: grid;
  gap: 12px;
}

.message-card {
  display: block;
  width: 100%;
  overflow: hidden;
  --shape-corner: var(--telecat-radius-lg);
  animation: card-rise var(--mdui-motion-duration-short4) var(--mdui-motion-easing-standard)
    both;
}

.message-card-shell {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.message-time {
  font-size: var(--mdui-typescale-body-small-size);
  line-height: var(--mdui-typescale-body-small-line-height);
  white-space: nowrap;
}

.message-text {
  max-width: min(72ch, 100%);
  white-space: pre-wrap;
  word-break: break-word;
  color: rgb(var(--mdui-color-on-surface));
  font-size: var(--mdui-typescale-body-large-size);
  line-height: var(--mdui-typescale-body-large-line-height);
  letter-spacing: var(--mdui-typescale-body-large-tracking);
}

.attachment-card {
  display: grid;
  gap: 14px;
}

.attachment-title {
  color: rgb(var(--mdui-color-on-surface));
  font-size: var(--mdui-typescale-title-medium-size);
  font-weight: var(--mdui-typescale-title-medium-weight);
  line-height: var(--mdui-typescale-title-medium-line-height);
  word-break: break-word;
}

.attachment-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.attachment-summary {
  font-size: var(--mdui-typescale-body-medium-size);
  line-height: var(--mdui-typescale-body-medium-line-height);
}

.attachment-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding-top: 6px;
  border-top: 1px solid rgb(var(--mdui-color-outline-variant) / 0.52);
}

.attachment-preview {
  overflow: hidden;
  border-radius: var(--telecat-radius-md);
  border: 1px solid rgb(var(--mdui-color-outline-variant) / 0.56);
  background: rgb(var(--mdui-color-surface-container-lowest));
}

.attachment-preview img,
.attachment-preview video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: contain;
}

.preview-panel {
  padding: 14px 16px;
  color: rgb(var(--mdui-color-on-surface-variant));
}

.upload-queue {
  display: grid;
  gap: 12px;
}

.upload-item-card {
  display: grid;
  gap: 12px;
  padding: 16px 18px;
  background: rgb(var(--mdui-color-surface));
}

.upload-item-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.upload-item-head strong {
  color: rgb(var(--mdui-color-on-surface));
  font-size: var(--mdui-typescale-title-small-size);
  font-weight: var(--mdui-typescale-title-small-weight);
  line-height: var(--mdui-typescale-title-small-line-height);
  word-break: break-all;
}

.upload-progress {
  width: 100%;
}

.composer-card {
  position: sticky;
  bottom: calc(12px + env(safe-area-inset-bottom));
  padding: 16px;
  background: rgb(var(--mdui-color-surface));
}

.composer-form {
  display: grid;
  gap: 16px;
}

.composer-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.composer-file-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

#selected-file-pill {
  max-width: min(100%, 420px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.empty-state {
  margin: auto;
  width: min(100%, 560px);
  display: grid;
  gap: 8px;
  place-items: center;
  padding: 32px 28px;
  text-align: center;
  background: rgb(var(--mdui-color-surface-container-low));
}

.empty-state-title {
  color: rgb(var(--mdui-color-on-surface));
  font-size: var(--mdui-typescale-title-large-size);
  font-weight: var(--mdui-typescale-title-large-weight);
  line-height: var(--mdui-typescale-title-large-line-height);
}

.empty-state p:last-child {
  margin: 0;
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 959px) {
  .page-shell {
    width: min(100vw - 24px, 100%);
  }

  .pane-header,
  .toolbar-main,
  .composer-footer {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 640px) {
  .top-bar-end {
    display: none;
  }

  .top-bar-title {
    font-size: var(--mdui-typescale-title-small-size);
  }

  .top-bar-subtitle {
    display: none;
  }

  .auth-card,
  .timeline-surface,
  .composer-card,
  .drawer-section {
    border-radius: 24px;
  }

  .attachment-actions {
    align-items: stretch;
  }
}