/* 默认（深色）：近正黑背景 + 中性灰层次，边框对比度加强便于分辨区块 */
:root {
  --bg: #050505;
  --panel: #111111;
  --panel-elevated: #181818;
  --border: #434343;
  --border-muted: #2f2f2f;
  --text: #ebebeb;
  --muted: #9a9a9a;
  --accent: #c8c8c8;
  --accent-hover: #f0f0f0;
  --btn-primary-bg: #1e1e1e;
  --btn-primary-hover: #2c2c2c;
  --btn-primary-text: #f5f5f5;
  --danger: #e05252;
  --success: #4caf6a;
  --warning: #c9a24a;
  --warning-muted: #d4b060;
  --surface-code: #0a0a0a;
  --surface-code-elevated: #141414;
  --rich-code-bg: rgba(255, 255, 255, 0.05);
  --msg-success-bg: rgba(76, 175, 106, 0.12);
  --msg-success-border: rgba(76, 175, 106, 0.38);
  --msg-error-bg: rgba(224, 82, 82, 0.1);
  --msg-error-border: rgba(224, 82, 82, 0.38);
  --badge-wait-bg: rgba(201, 162, 74, 0.14);
  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.05) inset, 0 8px 24px rgba(0, 0, 0, 0.35);
}

html[data-theme="dark"] {
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #f4f6fa;
  --panel: #ffffff;
  --panel-elevated: #ffffff;
  --border: #d1dae6;
  --border-muted: #e2e8f0;
  --text: #1a2332;
  --muted: #5c6b7d;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --danger: #cf222e;
  --success: #1a7f37;
  --warning: #9a6700;
  --warning-muted: #bf8700;
  --surface-code: #eef1f6;
  --surface-code-elevated: #e4e9f0;
  --rich-code-bg: rgba(0, 0, 0, 0.06);
  --msg-success-bg: rgba(26, 127, 55, 0.12);
  --msg-success-border: rgba(26, 127, 55, 0.35);
  --msg-error-bg: rgba(207, 34, 46, 0.08);
  --msg-error-border: rgba(207, 34, 46, 0.35);
  --badge-wait-bg: rgba(191, 135, 0, 0.18);
  --btn-primary-bg: #0969da;
  --btn-primary-hover: #0550ae;
  --btn-primary-text: #fff;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.wrap:has(.compose-page) {
  max-width: 1320px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.topbar-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.theme-switcher {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  cursor: pointer;
}

.theme-select {
  max-width: 9rem;
  min-width: 7.5rem;
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
}

.nav a.btn-link {
  color: var(--muted);
}
.nav a.btn-link:hover {
  color: var(--text);
}

.user-pill {
  font-size: 0.85rem;
  color: var(--muted);
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card h1,
.card h2 {
  margin-top: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.form-row {
  margin-bottom: 1rem;
}
.form-row label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.input {
  width: 100%;
  max-width: 420px;
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-elevated, var(--bg));
  color: var(--text);
  font-size: 1rem;
}

select.input {
  max-width: 420px;
}

.errorlist {
  list-style: none;
  padding: 0;
  margin: 0.35rem 0 0;
  color: var(--danger);
  font-size: 0.85rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 500;
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}
.btn-primary:hover {
  background: var(--btn-primary-hover);
}

html[data-theme="dark"] .btn-primary {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

html[data-theme="dark"] .btn-primary:hover {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: var(--muted);
}

.btn-secondary {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-save-draft {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  transition: background 0.15s, border-color 0.15s, color 0.15s, opacity 0.15s;
}

.btn-save-draft:not(:disabled) {
  background: rgba(9, 105, 218, 0.1);
  border-color: rgba(9, 105, 218, 0.45);
  color: var(--accent);
}

html[data-theme="dark"] .btn-save-draft:not(:disabled) {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.22);
  color: var(--accent-hover);
}

.btn-save-draft:not(:disabled):hover {
  background: rgba(9, 105, 218, 0.16);
  border-color: var(--accent);
}

html[data-theme="dark"] .btn-save-draft:not(:disabled):hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-hover);
}

.btn-save-draft:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.messages {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}
.messages li {
  padding: 0.6rem 0.85rem;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}
.messages .success {
  background: var(--msg-success-bg);
  border: 1px solid var(--msg-success-border);
  color: var(--success);
}
.messages .error {
  background: var(--msg-error-bg);
  border: 1px solid var(--msg-error-border);
  color: var(--danger);
}

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.data th,
table.data td {
  text-align: left;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border-muted, var(--border));
  vertical-align: top;
}
table.data th {
  color: var(--muted);
  font-weight: 500;
  width: 140px;
}

html[data-theme="dark"] table.data thead th {
  border-bottom: 1px solid var(--border);
}

html[data-theme="dark"] .btn-ghost {
  border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

html[data-theme="dark"] .btn-ghost:hover {
  border-color: color-mix(in srgb, var(--border) 60%, var(--accent) 40%);
}

html[data-theme="dark"] .theme-select,
html[data-theme="dark"] .input:focus,
html[data-theme="dark"] .theme-select:focus {
  border-color: color-mix(in srgb, var(--border) 50%, var(--accent) 50%);
  outline: none;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.06);
}

html[data-theme="dark"] .badge {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

html[data-theme="dark"] .paper-meta-table thead th,
html[data-theme="dark"] .compose-kp-tree,
html[data-theme="dark"] .paper-dev-details,
html[data-theme="dark"] .upload-dropzone {
  border-color: var(--border);
}

html[data-theme="dark"] .site-footer {
  border-top-color: var(--border);
}

.stem-preview {
  max-width: 480px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--muted);
  font-size: 0.85rem;
}

.question-list-table .question-list-row {
  cursor: pointer;
}

.question-list-table .question-list-row:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.question-list-table .question-list-stem-link {
  color: inherit;
  text-decoration: none;
  display: block;
}

.question-list-table .question-list-stem-cell {
  min-width: 200px;
  max-width: 520px;
}

.question-list-table .question-list-stem-link .stem-preview {
  max-height: 6.5rem;
  overflow: hidden;
  color: var(--text);
}

.question-list-table .question-list-stem-link:hover .stem-preview {
  color: var(--accent-hover);
}

.question-list-table .question-list-paper-link {
  position: relative;
  z-index: 1;
}

.json-block {
  margin: 0;
  padding: 1rem;
  background: var(--surface-code);
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: auto;
  max-height: 70vh;
  font-size: 0.8rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}

.pagination {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--muted);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.75rem;
  background: var(--border);
  color: var(--text);
}

.badge.ok {
  background: rgba(76, 175, 106, 0.18);
  color: var(--success);
}
html[data-theme="light"] .badge.ok {
  background: rgba(26, 127, 55, 0.15);
}

.badge.wait {
  background: var(--badge-wait-bg);
  color: var(--warning-muted);
}
html[data-theme="light"] .badge.wait {
  color: var(--warning);
}

/* —— 题目标签调试展示 —— */
.item-label-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.item-label-chip {
  display: inline-block;
  padding: 0.12rem 0.45rem;
  font-size: 0.72rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface-elevated, rgba(255, 255, 255, 0.06));
  color: var(--text);
}

.item-label-chip.kind-compose {
  border-color: var(--success);
  color: var(--success);
}

.item-label-chip.kind-compose-warn {
  border-color: var(--warning-muted);
  color: var(--warning-muted);
}

.item-label-chip.kind-kp,
.item-label-chip.kind-kp-more {
  border-color: #b37feb;
  color: #b37feb;
}

.item-label-debug {
  max-width: 14rem;
}

.kp-debug-list {
  margin: 0;
  padding-left: 1.1rem;
}

/* —— 试题 content 结构化展示 —— */
.fmt-pill {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--muted);
  margin-left: 0.35rem;
  vertical-align: middle;
}

.question-content-card .question-body,
.question-body {
  font-size: 1rem;
  line-height: 1.65;
  word-break: break-word;
}

.rich-md,
.rich-md p {
  margin: 0.35rem 0;
}
.rich-md p:first-child {
  margin-top: 0;
}
.rich-md p:last-child {
  margin-bottom: 0;
}
.rich-md ul,
.rich-md ol {
  margin: 0.5rem 0 0.5rem 1.25rem;
  padding: 0;
}
.rich-md code {
  font-size: 0.88em;
  background: var(--rich-code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.rich-md pre {
  background: var(--surface-code);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  overflow: auto;
  border: 1px solid var(--border);
}
.content-plain {
  line-height: 1.65;
}

.rich-md table,
.rich-html table {
  border-collapse: collapse;
  margin: 0.75rem auto;
  max-width: 100%;
  font-size: 0.95rem;
}
.rich-md table,
.rich-md th,
.rich-md td,
.rich-html table,
.rich-html th,
.rich-html td {
  border: 1px solid var(--border);
}
.rich-md th,
.rich-md td,
.rich-html th,
.rich-html td {
  padding: 0.4rem 0.65rem;
  text-align: center;
  vertical-align: middle;
  word-wrap: break-word;
}
.rich-md th,
.rich-html th {
  background: var(--surface-code);
  font-weight: 600;
}
.content-latex {
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.95rem;
}

.option-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
  counter-reset: opt;
}
.option-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}
.option-list li:last-child {
  border-bottom: none;
}
.opt-key {
  flex: 0 0 2.25rem;
  font-weight: 600;
  color: var(--accent);
}
.opt-body {
  flex: 1;
  min-width: 0;
}
.opt-body .rich-md p {
  margin: 0.15rem 0;
}

.answer-wrap .answer-pre {
  margin: 0;
  padding: 1rem;
  background: var(--surface-code);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 50vh;
  overflow: auto;
}
.answer-wrap .answer-scalar {
  font-size: 1.05rem;
  padding: 0.5rem 0;
}

.kv-table th {
  width: 200px;
  vertical-align: top;
}
.json-inline {
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: var(--surface-code);
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 16rem;
  overflow: auto;
}
.ext-scalar {
  word-break: break-word;
}

.sub-h {
  font-size: 0.95rem;
  margin: 1rem 0 0.35rem;
  color: var(--muted);
  font-weight: 600;
}
.sub-h:first-of-type {
  margin-top: 0;
}

.media-list {
  margin: 0;
  padding-left: 1.1rem;
}
.media-list li {
  margin: 0.35rem 0;
}

.media-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.media-figure {
  margin: 0;
  max-width: 400px;
}
.media-figure img {
  border-radius: 4px;
  border: 1px solid var(--border, #222);
}
.media-figure figcaption {
  font-size: 0.85rem;
  color: var(--muted, #666);
  margin-top: 0.3rem;
  word-break: break-all;
}
.media-figure figcaption small {
  font-size: 0.75rem;
  opacity: 0.7;
}

.q-media-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin: 0 0 1rem;
}
.q-media-gallery--attachments {
  margin-bottom: 1.25rem;
}
.opt-media.q-media-gallery {
  margin-top: 0.75rem;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}
.q-media-figure {
  margin: 0;
}
.q-media-link {
  display: block;
  line-height: 0;
}
.q-media-img,
.rich-md img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0.75rem auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-code);
}
.q-media-caption {
  margin-top: 0.45rem;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
}
.q-media-source {
  font-size: 0.72rem;
}
.q-media-url {
  word-break: break-all;
}
.profile-question-stem .q-media-gallery {
  display: none;
}
.profile-question-stem .q-media-img,
.profile-question-stem.rich-md img {
  max-height: 4.5rem;
  width: auto;
}

.raw-json-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
.raw-json-details[open] summary {
  margin-bottom: 0.75rem;
}

/* 智能选题组卷 */
.compose-page {
  max-width: none;
  width: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: calc(100vh - 7.5rem);
}

.compose-page .card {
  margin-bottom: 0;
}

.compose-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  padding: 0.85rem 1rem;
}

.compose-topbar__text {
  flex: 1 1 280px;
  min-width: 0;
}

.compose-topbar .compose-hero-title {
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
}

.compose-topbar .compose-hero-lead {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.compose-topbar .compose-example-block {
  flex: 1 1 320px;
  min-width: 0;
}

.compose-topbar .compose-examples-label {
  margin-bottom: 0.35rem;
}

/* 左右分栏：左对话气泡区，右试卷预览（同高、并排） */
.compose-workspace {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  flex: 1 1 auto;
  min-height: min(720px, calc(100vh - 11rem));
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

.compose-chat-column {
  flex: 1 1 58%;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow: hidden;
}

.compose-preview-panel {
  flex: 0 0 clamp(300px, 40%, 480px);
  width: clamp(300px, 40%, 480px);
  max-width: 480px;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--surface-code-elevated);
  transform: translateX(0);
  transition:
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.compose-preview-panel.is-filled {
  border-left: 2px solid var(--accent);
  box-shadow: -4px 0 24px rgba(43, 124, 255, 0.08);
}

.compose-preview-panel.is-visible {
  animation: compose-preview-slide-in 0.28s ease-out;
}

@keyframes compose-preview-slide-in {
  from {
    opacity: 0.6;
    transform: translateX(12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (max-width: 720px) {
  .compose-workspace {
    flex-direction: column;
    min-height: auto;
  }

  .compose-chat-column {
    flex: 1 1 auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    min-height: min(52vh, 480px);
  }

  .compose-preview-panel {
    flex: 0 0 auto;
    width: 100%;
    max-width: none;
    min-height: 360px;
    border-left: none;
  }

  .compose-preview-panel.is-filled {
    border-left: none;
    border-top: 2px solid var(--accent);
    box-shadow: 0 -4px 24px rgba(43, 124, 255, 0.08);
  }
}

.compose-preview-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-code-elevated);
}

.compose-preview-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.compose-preview-sub {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
}

.compose-preview-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 1rem;
}

.compose-preview-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  text-align: center;
  padding: 1rem;
}

.compose-preview-in-panel .compose-preview-meta-line {
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.compose-param-hint {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
}

.compose-param-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.65rem;
}

.compose-param-chip-wrap {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}

.compose-param-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.45rem 0.3rem 0.55rem;
  margin: 0;
  cursor: text;
}

.compose-param-chip-label {
  font-size: 0.72rem;
  color: var(--muted);
  white-space: nowrap;
}

.compose-param-chip-input {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  padding: 0;
  min-width: 2.5rem;
  max-width: 5.5rem;
  outline: none;
}

.compose-param-chip-input--num {
  max-width: 3rem;
  text-align: center;
}

.compose-param-chip-select {
  max-width: 4.5rem;
  cursor: pointer;
}

.compose-param-insert {
  border: none;
  border-left: 1px solid var(--border);
  background: rgba(43, 124, 255, 0.08);
  color: var(--accent);
  font-size: 0.72rem;
  padding: 0 0.5rem;
  cursor: pointer;
  white-space: nowrap;
}

.compose-param-insert:hover {
  background: rgba(43, 124, 255, 0.16);
}

.compose-hero-title {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.compose-hero-lead {
  margin: 0 0 1rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.compose-example-block {
  margin-top: 0.25rem;
}

.compose-examples-label {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
}

.compose-mode-tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.compose-mode-tab {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
}

.compose-mode-tab.is-active {
  border-color: var(--accent);
  background: rgba(43, 124, 255, 0.12);
  color: var(--accent);
}

.compose-bank-options {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.65rem;
  font-size: 0.85rem;
}

.compose-check {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.compose-ai-badge {
  border-color: #b37feb;
  color: #b37feb;
}

.compose-source-badge {
  border-color: var(--accent);
  color: var(--accent);
}

.paper-list-tabs .compose-mode-tab {
  text-decoration: none;
}

.profile-section-desc {
  margin: -0.25rem 0 0.65rem;
  font-size: 0.88rem;
}

.compose-bank-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.compose-bank-actions__primary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.compose-pool-stats {
  margin: 0;
  padding: 0.65rem 0.75rem;
  font-size: 0.78rem;
  line-height: 1.45;
  background: var(--surface-elevated, rgba(255, 255, 255, 0.04));
  border-radius: 6px;
  white-space: pre-wrap;
}

.compose-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.compose-chip {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface-code-elevated);
  color: var(--text);
  font-size: 0.82rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  transition: border-color 0.15s, background 0.15s;
}

.compose-chip:hover {
  border-color: var(--accent);
  background: var(--panel);
}

.compose-toolbar-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  align-items: flex-end;
}

.compose-toolbar-field {
  flex: 0 0 auto;
  min-width: 4.5rem;
}

.compose-toolbar-field--grow {
  flex: 1 1 180px;
  min-width: 160px;
}

.compose-toolbar-field label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.input--sm {
  padding: 0.4rem 0.5rem;
  font-size: 0.88rem;
  max-width: none;
  width: 100%;
  min-width: 0;
}

.compose-toolbar .input,
.compose-toolbar select.input {
  max-width: none;
}

.compose-api-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--muted);
}

.compose-api-lead {
  margin: 0.5rem 0 0.75rem;
  font-size: 0.88rem;
}

.compose-api-grid {
  display: grid;
  gap: 0.5rem 1rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.compose-chat-shell {
  display: flex;
  flex-direction: column;
  min-height: min(70vh, 560px);
  max-height: 78vh;
  padding: 0;
  overflow: hidden;
}

.compose-chat-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  background: var(--surface-code-elevated);
}

.compose-chat-title {
  font-weight: 700;
  font-size: 0.95rem;
}

.compose-chat-sub {
  font-size: 0.82rem;
}

.compose-chat-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-behavior: smooth;
}

.compose-chat-column .compose-chat-messages {
  min-height: 120px;
  max-height: none;
}

.compose-msg {
  display: flex;
  gap: 0.65rem;
  max-width: 100%;
}

.compose-msg--user {
  flex-direction: row-reverse;
  align-self: flex-end;
  max-width: min(100%, 40rem);
}

.compose-msg-avatar {
  flex: 0 0 2rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.compose-msg--assistant .compose-msg-avatar {
  background: linear-gradient(160deg, #2a2a2a, #121212);
  color: var(--btn-primary-text);
}

.compose-msg--user .compose-msg-avatar {
  background: #1f1f1f;
  color: var(--text);
}

.compose-msg-bubble {
  flex: 1 1 auto;
  min-width: 0;
  max-width: min(100%, 36rem);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 0.92rem;
  line-height: 1.55;
}

.compose-msg--assistant .compose-msg-bubble {
  background: var(--panel);
  border-radius: 4px 12px 12px 12px;
}

.compose-msg--user .compose-msg-bubble {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
  border-radius: 12px 4px 12px 12px;
}

html[data-theme="light"] .compose-msg--user .compose-msg-bubble {
  background: rgba(9, 105, 218, 0.08);
  border-color: rgba(9, 105, 218, 0.28);
}

.compose-msg-bubble p {
  margin: 0 0 0.5rem;
}

.compose-msg-bubble p:last-child {
  margin-bottom: 0;
}

.compose-msg-meta {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.compose-msg--typing .compose-msg-bubble {
  color: var(--muted);
  font-style: italic;
}

.compose-chat-composer {
  border-top: 1px solid var(--border);
  padding: 0.75rem 1rem 1rem;
  background: var(--surface-code-elevated);
}

.compose-chat-input {
  width: 100%;
  max-width: none;
  resize: vertical;
  min-height: 3.25rem;
  margin-bottom: 0.5rem;
}

.compose-composer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.compose-composer-bar__main {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.compose-status--inline {
  margin-top: 0.5rem;
  margin-bottom: 0;
  width: 100%;
}

.compose-status {
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
}

.compose-status--info {
  background: var(--surface-code);
  color: var(--muted);
}

.compose-status--success {
  background: var(--msg-success-bg);
  border-color: var(--msg-success-border);
  color: var(--success);
}

.compose-status--error {
  background: var(--msg-error-bg);
  border-color: var(--msg-error-border);
  color: var(--danger);
}

.compose-preview-in-bubble {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border);
}

.compose-preview-in-bubble .compose-preview-meta-line {
  font-size: 0.82rem;
  margin-bottom: 0.65rem;
  color: var(--muted);
}

.compose-question-list {
  margin: 0;
  padding-left: 1.25rem;
}

.compose-question-item {
  margin-bottom: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
}

.compose-question-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.compose-question-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.compose-question-stem {
  margin: 0.35rem 0 0.5rem;
  line-height: 1.55;
}

.compose-answer {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
}

/* ---------- 门户首页 ---------- */
.home-hero {
  margin-bottom: 2rem;
}

.home-hero-grid {
  display: grid;
  gap: 1.5rem;
  align-items: stretch;
}

@media (min-width: 860px) {
  .home-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.home-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.home-title {
  font-size: clamp(1.65rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.home-lead {
  font-size: 1.05rem;
  line-height: 1.65;
  max-width: 38rem;
  margin: 0 0 1.25rem;
}

.home-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.home-hero-panel {
  margin-bottom: 0;
}

.home-panel-title {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.home-steps {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 1.7;
  color: var(--text);
  font-size: 0.92rem;
}

.home-steps li {
  margin-bottom: 0.4rem;
}

.home-section {
  margin-bottom: 2rem;
}

.home-section--tight {
  margin-bottom: 0;
}

.home-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.home-section-head h2 {
  margin: 0;
  font-size: 1.2rem;
}

.home-section-head .muted {
  flex: 1 1 200px;
  margin: 0;
  font-size: 0.88rem;
}

.home-section-link {
  font-size: 0.88rem;
  white-space: nowrap;
}

.home-paper-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 960px) {
  .home-paper-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .home-paper-grid {
    grid-template-columns: 1fr;
  }
}

.home-subject-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.65rem 0 0.15rem;
}

.home-subject-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.75rem;
  font-size: 0.82rem;
  line-height: 1.35;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.home-subject-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.home-subject-tab.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--panel));
  color: var(--accent);
  font-weight: 600;
}

.home-paper-card {
  display: flex;
  flex-direction: column;
  margin-bottom: 0;
}

.home-paper-card-head {
  margin-bottom: 0.65rem;
}

.home-paper-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.35;
}

.home-paper-meta {
  display: block;
  font-size: 0.82rem;
  margin-top: 0.25rem;
}

.home-pdf-wrap {
  flex: 1 1 auto;
  min-height: 200px;
  max-height: 280px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-code);
}

.home-pdf-frame {
  width: 100%;
  height: 260px;
  border: none;
  display: block;
}

.home-paper-fallback {
  font-size: 0.88rem;
  margin: 0 0 0.5rem;
  flex: 1;
}

.home-paper-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.75rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}

.home-two-col {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

@media (min-width: 900px) {
  .home-two-col {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.home-two-col-right {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.home-about-side .home-section-head {
  margin-bottom: 0.5rem;
}

.home-about-side .home-about {
  font-size: 0.92rem;
  line-height: 1.6;
}

.home-about-side .home-about p {
  margin-bottom: 0.65rem;
}

.home-about-side .home-about code {
  font-size: 0.82em;
}

.home-question-list {
  padding: 0;
  margin: 0;
}

.home-question-row {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: background 0.12s ease;
}

.home-question-row:last-child {
  border-bottom: none;
}

.home-question-row:hover {
  background: var(--rich-code-bg);
}

.home-question-row .badge {
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.home-question-row .home-question-stem {
  flex: 1;
  min-width: 0;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text);
}

.home-question-row .home-question-stem mjx-container {
  font-size: 0.95em;
}

.home-ai-card {
  margin-bottom: 0;
}

.home-compose-features {
  margin: 0;
  padding-left: 1.15rem;
  line-height: 1.65;
  font-size: 0.9rem;
}

.home-compose-features li {
  margin-bottom: 0.55rem;
}

.home-compose-features li:last-child {
  margin-bottom: 0;
}

.home-about p {
  margin: 0 0 0.75rem;
  line-height: 1.65;
}

.home-about p:last-child {
  margin-bottom: 0;
}

.home-about code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--rich-code-bg);
}

.home-cta {
  background: linear-gradient(
    135deg,
    var(--surface-code-elevated),
    var(--panel)
  );
  margin-bottom: 0;
}

.home-cta-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.home-cta-title {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}

html[data-theme="light"] .home-cta {
  background: linear-gradient(135deg, #f0f4fb, #ffffff);
}

/* ---------- 试卷详情页脚（开发与校对） ---------- */
.paper-detail-footer {
  margin-top: 1.5rem;
}

.paper-detail-footer__title {
  margin: 0 0 0.25rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.paper-detail-footer__hint {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
}

.paper-detail-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.paper-detail-footer__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  font-size: 0.85rem;
}

.paper-detail-footer__item--block {
  display: block;
}

.paper-detail-footer__label {
  flex: 0 0 5.5rem;
  color: var(--muted);
  font-weight: 500;
}

.paper-detail-footer__value {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
}

.paper-detail-footer__inline-form {
  display: inline;
  margin: 0;
}

.paper-answer-inline-form {
  display: inline;
  margin-left: 0.5rem;
}

.paper-answer-upload-btn {
  cursor: pointer;
  margin: 0;
}

.paper-answer-file-input {
  position: absolute;
  width: 0.1px;
  height: 0.1px;
  opacity: 0;
  overflow: hidden;
  z-index: -1;
}

.paper-dev-details {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg) 40%, var(--panel));
}

.paper-dev-details__summary {
  cursor: pointer;
  padding: 0.5rem 0.65rem;
  font-size: 0.85rem;
  font-weight: 500;
  list-style: none;
  user-select: none;
}

.paper-dev-details__summary::-webkit-details-marker {
  display: none;
}

.paper-dev-details__summary::before {
  content: "▸ ";
  opacity: 0.65;
}

.paper-dev-details[open] .paper-dev-details__summary::before {
  content: "▾ ";
}

.paper-dev-details__body {
  padding: 0 0.65rem 0.65rem;
  border-top: 1px solid var(--border);
}

.paper-dev-details__body .paper-preview-wrap {
  margin-top: 0.5rem;
}

.paper-detail-items-table .paper-detail-stem-cell {
  min-width: 200px;
  max-width: 520px;
}

.paper-detail-items-table .paper-detail-stem-cell .stem-preview {
  max-height: 6.5rem;
  overflow: hidden;
  color: var(--text);
}

/* ---------- 站点页脚（首页） ---------- */
.site-footer {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.site-footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem 2rem;
  margin-bottom: 1.75rem;
}

@media (max-width: 768px) {
  .site-footer-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

.site-footer-brand {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.site-footer-desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.site-footer-col-title {
  margin: 0 0 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-footer-links,
.site-footer-meta {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
  line-height: 1.75;
}

.site-footer-links a {
  font-weight: 500;
}

.site-footer-meta li {
  margin: 0;
}

.site-footer-bottom {
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer-copy {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
}

.site-footer-beian {
  margin: 0;
  font-size: 0.82rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.5rem;
}

.site-footer-beian a {
  color: var(--muted);
}

.site-footer-beian a:hover {
  color: var(--accent);
}

.site-footer-beian-sep {
  color: var(--border);
  user-select: none;
}

.site-footer-gongan::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 0.25rem;
  vertical-align: -2px;
  background: var(--muted);
  border-radius: 2px;
  opacity: 0.55;
}

/* ---------- 个人中心 ---------- */
.profile-back {
  margin: 0 0 0.75rem;
}

.profile-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.profile-header-main {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  flex: 1;
  min-width: 0;
}

.profile-avatar {
  flex-shrink: 0;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  font-weight: 700;
  background: var(--surface-code-elevated);
  border: 1px solid var(--border);
  color: var(--accent);
}

.profile-title {
  margin: 0 0 0.2rem;
  font-size: 1.45rem;
}

.profile-sub {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
}

.profile-bio {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  max-width: 36rem;
}

.profile-edit-btn {
  flex-shrink: 0;
}

.profile-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem 1.5rem;
  margin-bottom: 1rem;
}

@media (max-width: 720px) {
  .profile-info-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.profile-info-item {
  margin: 0;
}

.profile-info-item dt {
  margin: 0 0 0.2rem;
  font-size: 0.78rem;
}

.profile-info-item dd {
  margin: 0;
  font-size: 0.95rem;
}

.profile-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .profile-stats {
    grid-template-columns: 1fr;
  }
}

.profile-stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem;
  text-align: center;
}

.profile-stat-card--muted {
  opacity: 0.85;
}

.profile-stat-num {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.profile-section {
  margin-bottom: 1.75rem;
}

.profile-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.profile-section-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.profile-more-hint {
  margin: 0.75rem 0 0;
  font-size: 0.82rem;
}

.profile-question-list {
  padding: 0;
  overflow: hidden;
}

.profile-question-row {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 0.5rem 0.75rem;
  align-items: start;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  color: inherit;
  text-decoration: none;
}

.profile-question-row:last-child {
  border-bottom: none;
}

.profile-question-row:hover {
  background: var(--rich-code-bg);
}

.profile-question-meta {
  font-size: 0.78rem;
  white-space: nowrap;
}

.profile-question-stem {
  grid-column: 1 / -1;
  font-size: 0.9rem;
  line-height: 1.45;
}

@media (min-width: 640px) {
  .profile-question-stem {
    grid-column: 3;
    grid-row: 1;
  }
  .profile-question-meta {
    grid-column: 2;
  }
}

.profile-placeholder {
  border-style: dashed;
}

.profile-edit-card {
  max-width: 520px;
  margin: 0 auto;
}

.profile-edit-title {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
}

.profile-edit-lead {
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
}

.profile-edit-form .form-row {
  margin-bottom: 1rem;
}

.profile-edit-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.88rem;
}

.profile-edit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.field-error {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.82rem;
  color: var(--danger);
}

a.user-pill {
  text-decoration: none;
  cursor: pointer;
}

a.user-pill:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
}

/* ---------- 上传试卷 ---------- */
.upload-page {
  max-width: 720px;
  margin: 0 auto;
}

.upload-page-head {
  margin-bottom: 1.25rem;
}

.upload-page-title {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.upload-page-lead {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.55;
}

.upload-card {
  padding: 1.5rem 1.5rem 1.75rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
}

html[data-theme="light"] .upload-card {
  box-shadow: 0 6px 28px rgba(15, 23, 42, 0.08);
}

.upload-form-errors {
  margin: 0 0 1rem;
}

.upload-step-label {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.upload-file-block {
  margin-bottom: 1.75rem;
}

.upload-dropzone {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 10.5rem;
  padding: 1.35rem 1rem;
  border: 2px dashed var(--border);
  border-radius: 14px;
  background: var(--surface-code-elevated);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    background 0.2s ease,
    box-shadow 0.2s ease;
}

.upload-dropzone:hover {
  border-color: var(--accent);
  background: var(--panel);
}

.upload-dropzone--drag {
  border-style: solid;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.12);
}

html[data-theme="dark"] .upload-dropzone--drag {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.06);
}

.upload-dropzone--active {
  border-style: solid;
  border-color: var(--success);
  background: var(--panel);
}

.upload-dropzone input[type="file"].upload-native-file,
.upload-dropzone input.upload-native-file {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
  font-size: 0;
}

.upload-dropzone-ui {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  text-align: center;
  pointer-events: none;
  max-width: 22rem;
}

.upload-dropzone-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  margin-bottom: 0.15rem;
}

.upload-dropzone--active .upload-dropzone-icon {
  color: var(--success);
}

.upload-dropzone-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.upload-dropzone-hint {
  font-size: 0.82rem;
  line-height: 1.45;
}

.upload-file-meta {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem;
}

.upload-file-name {
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}

.upload-meta-block {
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

.upload-meta-hint {
  margin: 0 0 1.1rem;
  font-size: 0.86rem;
  line-height: 1.5;
}

.upload-fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.25rem;
}

@media (max-width: 600px) {
  .upload-fields-grid {
    grid-template-columns: 1fr;
  }
}

.upload-fields-grid .form-row {
  margin-bottom: 0;
}

.upload-fields-grid .form-row label {
  font-size: 0.82rem;
}

.upload-fields-grid .input,
.upload-fields-grid select.input {
  width: 100%;
  max-width: none;
}

.upload-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.upload-actions .btn-primary {
  min-width: 10rem;
}

.pdf-upload-btn {
  min-width: 10rem;
  padding: 0.5rem 1rem;
  text-align: center;
}

.pdf-upload-form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 0.9rem;
}

.pdf-file-input {
  font-size: 0.95rem;
  color: var(--text);
}

.pdf-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---------- 登录 / 注册 ---------- */
.auth-page {
  max-width: 440px;
  margin: 0 auto;
}

.auth-page-head {
  margin-bottom: 1.35rem;
  text-align: center;
}

.auth-kicker {
  margin: 0 0 0.4rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.auth-page-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.auth-page-lead {
  margin: 0 auto;
  max-width: 26rem;
  font-size: 0.92rem;
  line-height: 1.55;
}

.auth-card {
  padding: 1.65rem 1.5rem 1.5rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

html[data-theme="light"] .auth-card {
  box-shadow: 0 8px 32px rgba(15, 23, 42, 0.09);
}

.auth-form {
  margin: 0;
}

.auth-alert {
  margin: 0 0 1.15rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  font-size: 0.88rem;
  line-height: 1.45;
}

.auth-alert--error {
  background: var(--msg-error-bg);
  border: 1px solid var(--msg-error-border);
  color: var(--text);
}

.auth-alert .errorlist {
  margin: 0;
}

.auth-form-row {
  margin-bottom: 1.1rem;
}

.auth-form-row:last-of-type {
  margin-bottom: 0;
}

.auth-label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}

.auth-form-row .input {
  width: 100%;
  max-width: none;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.auth-form-row .input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

html[data-theme="dark"] .auth-form-row .input:focus {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.08);
}

.auth-form-row .errorlist {
  margin-top: 0.4rem;
}

.auth-actions {
  margin-top: 1.35rem;
}

.auth-btn-primary {
  width: 100%;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  border-radius: 10px;
}

.auth-footer-line {
  margin: 1.25rem 0 0;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.88rem;
}

.auth-footer-line a {
  font-weight: 600;
}

.auth-footer-back {
  margin: 0.75rem 0 0;
  text-align: center;
  font-size: 0.84rem;
}

.auth-footer-back a {
  color: var(--muted);
}

.auth-footer-back a:hover {
  color: var(--accent);
}