:root {
  color-scheme: light dark;
  --ink: #162433;
  --ink-soft: #42566b;
  --ink-muted: #64768a;
  --navy: #143a63;
  --navy-hover: #0f2e50;
  --blue-soft: #e9f1f8;
  --blue-line: #c9dbe9;
  --teal: #26778a;
  --surface: #ffffff;
  --surface-muted: #f4f7fa;
  --surface-raised: #fbfcfd;
  --line: #dce4eb;
  --line-strong: #c4d0da;
  --success: #2d6f55;
  --warning: #8b5a19;
  --danger: #aa2e36;
  --focus: #3b82b8;
  --shadow-sm: 0 1px 2px rgba(18, 45, 68, 0.05);
  --shadow-md: 0 12px 32px rgba(18, 45, 68, 0.1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --sidebar: 248px;
  --nav-height: 72px;
  --transition: 180ms ease;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--surface-muted);
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  background: var(--surface-muted);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a,
select {
  touch-action: manipulation;
}

button {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 42%, transparent);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.offline-banner {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 8px 16px;
  color: #fff;
  background: #6f4a17;
  text-align: center;
  font-size: 14px;
}

.app-notice {
  position: fixed;
  inset: 12px 18px auto auto;
  z-index: 110;
  width: min(560px, calc(100% - 36px));
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-md);
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  font-size: 14px;
}

body.is-offline .app-notice {
  top: 48px;
}

.app-notice-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 6px;
}

.app-notice .button,
.app-notice .text-button {
  min-height: 38px;
  padding-block: 7px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  font-weight: 730;
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 12px;
  color: #fff;
  background: var(--navy);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.04em;
}

.brand-large {
  font-size: 18px;
}

.brand-large .brand-mark {
  width: 48px;
  height: 48px;
  flex-basis: 48px;
}

.auth-shell {
  width: min(1180px, 100%);
  min-height: 100dvh;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.7fr);
  align-items: center;
  gap: clamp(40px, 8vw, 112px);
}

.auth-intro {
  max-width: 640px;
}

.eyebrow,
.section-kicker,
.topbar-context {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 750;
  line-height: 1.3;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.auth-intro .eyebrow {
  margin-top: 64px;
}

.auth-intro h1 {
  max-width: 620px;
  margin: 0;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.auth-copy {
  max-width: 600px;
  margin: 28px 0;
  color: var(--ink-soft);
  font-size: 18px;
}

.auth-points {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
}

.auth-points li {
  position: relative;
  padding: 10px 0 10px 28px;
}

.auth-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 19px;
  width: 10px;
  height: 5px;
  border: solid var(--teal);
  border-width: 0 0 2px 2px;
  transform: rotate(-45deg);
}

.auth-card {
  width: 100%;
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

.auth-card h2,
.page-intro h2,
.home-hero h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.helper,
.page-intro > p:last-child,
.home-hero > p,
.project-panel > p,
.field-help {
  color: var(--ink-soft);
}

.auth-card label,
.composer > label {
  display: block;
  margin: 20px 0 7px;
  font-size: 14px;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

input,
textarea {
  padding: 11px 13px;
}

select {
  padding: 10px 34px 10px 12px;
}

textarea {
  min-height: 150px;
  resize: vertical;
  line-height: 1.65;
}

input:hover,
select:hover,
textarea:hover {
  border-color: var(--ink-muted);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 16%, transparent);
}

.password-field {
  position: relative;
}

.password-field input {
  padding-right: 68px;
}

.password-toggle {
  position: absolute;
  right: 4px;
  top: 4px;
}

.field-help {
  margin: 6px 0 0;
  font-size: 13px;
}

.form-error {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-left: 3px solid var(--danger);
  border-radius: 4px;
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 8%, var(--surface));
  font-size: 14px;
}

.button,
.icon-button,
.icon-text-button,
.text-button,
.quick-links button,
.question-starters button {
  min-height: 44px;
  border: 0;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), border-color var(--transition), opacity var(--transition), box-shadow var(--transition);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-weight: 720;
}

.button:active,
.nav-item:active,
.bottom-nav-item:active,
.quick-links button:active,
.question-starters button:active {
  opacity: 0.72;
}

.button-primary {
  color: #fff;
  background: var(--navy);
  box-shadow: 0 5px 14px rgba(20, 58, 99, 0.18);
}

.button-primary:hover {
  background: var(--navy-hover);
}

.button-secondary {
  border: 1px solid var(--line-strong);
  color: var(--navy);
  background: var(--surface);
}

.button-secondary:hover {
  border-color: var(--navy);
  background: var(--blue-soft);
}

.button-block {
  width: 100%;
  margin-top: 24px;
}

.button[disabled],
.icon-button[disabled] {
  cursor: not-allowed;
  opacity: 0.48;
  box-shadow: none;
}

.text-button,
.icon-text-button {
  padding: 8px 10px;
  color: var(--navy);
  background: transparent;
  font-size: 14px;
  font-weight: 700;
}

.text-button:hover,
.icon-text-button:hover {
  background: var(--blue-soft);
}

.icon-button {
  display: grid;
  place-items: center;
  width: 44px;
  min-width: 44px;
  padding: 0;
  color: var(--ink-soft);
  background: transparent;
}

.icon-button:hover {
  color: var(--navy);
  background: var(--blue-soft);
}

.icon-button svg,
.nav-item svg,
.bottom-nav-item svg,
.hero-search svg,
.search-field svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-button svg {
  width: 22px;
  height: 22px;
}

.app-shell {
  min-height: 100dvh;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  width: var(--sidebar);
  padding: 28px 18px 22px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.sidebar .brand {
  padding: 0 10px;
}

.sidebar-nav {
  display: grid;
  gap: 6px;
  margin-top: 48px;
}

.nav-item {
  position: relative;
  min-height: 48px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 13px;
  border: 0;
  border-radius: 10px;
  color: var(--ink-soft);
  background: transparent;
  text-align: left;
  font-weight: 650;
}

.nav-item svg {
  width: 22px;
  height: 22px;
}

.nav-item:hover {
  color: var(--navy);
  background: var(--surface-muted);
}

.nav-item.is-active {
  color: var(--navy);
  background: var(--blue-soft);
  box-shadow: inset 3px 0 0 var(--navy);
}

.sidebar-footer {
  margin-top: auto;
  padding: 18px 10px 0;
  border-top: 1px solid var(--line);
}

.sidebar-footer p {
  margin: 0 0 2px;
  font-weight: 700;
}

.sidebar-footer .text-button {
  margin-left: -10px;
}

.app-main {
  min-height: 100dvh;
  margin-left: var(--sidebar);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 86px;
  padding: 16px clamp(24px, 4vw, 52px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  background: color-mix(in srgb, var(--surface-muted) 92%, transparent);
  backdrop-filter: blur(12px);
}

.topbar-context {
  margin-bottom: 1px;
  color: var(--ink-muted);
  letter-spacing: 0.06em;
}

.topbar h1 {
  margin: 0;
  font-size: 23px;
  line-height: 1.2;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-chip,
.badge,
.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
}

.status-chip {
  min-height: 32px;
  padding: 6px 10px;
  color: var(--ink-soft);
  background: var(--surface);
}

.status-chip.ai-on {
  border-color: var(--blue-line);
  color: var(--navy);
  background: var(--blue-soft);
}

.install-button {
  min-height: 38px;
  padding: 7px 12px;
  font-size: 13px;
}

.install-guide {
  margin-bottom: 20px;
  padding: 18px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--surface), var(--blue-soft));
}

.install-guide h3,
.install-guide p {
  margin: 0;
}

.install-guide p:last-child {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 14px;
}

.content {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 42px clamp(24px, 4vw, 52px) 80px;
}

.view {
  animation: view-in 180ms ease-out;
}

@keyframes view-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.home-hero {
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--surface) 15%, var(--blue-soft) 100%);
  box-shadow: var(--shadow-sm);
}

.home-hero > p:not(.section-kicker) {
  max-width: 700px;
  margin: 12px 0 24px;
  font-size: 17px;
}

.hero-search {
  position: relative;
  max-width: 780px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.hero-search svg,
.search-field svg {
  position: absolute;
  left: 16px;
  top: 50%;
  width: 21px;
  height: 21px;
  color: var(--ink-muted);
  transform: translateY(-50%);
  pointer-events: none;
}

.hero-search input {
  min-height: 56px;
  padding-left: 48px;
  border-color: var(--blue-line);
  box-shadow: 0 6px 18px rgba(20, 58, 99, 0.08);
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.quick-links button {
  min-height: 36px;
  padding: 6px 11px;
  border: 1px solid var(--blue-line);
  color: var(--navy);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  font-size: 13px;
}

.quick-links button:hover {
  background: var(--surface);
}

.stat-grid {
  margin: 24px 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.stat-card strong {
  display: block;
  color: var(--navy);
  font-size: 28px;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
}

.stat-card span {
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 650;
}

.two-column,
.ask-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.8fr);
  gap: 20px;
}

.content-section,
.composer,
.question-starters,
.answer-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.content-section,
.composer,
.answer-panel {
  padding: clamp(20px, 3vw, 28px);
}

.question-starters {
  height: fit-content;
  padding: 20px;
}

.project-panel {
  border-color: var(--blue-line);
}

.project-panel h3,
.section-heading h3,
.question-starters h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.35;
}

.inline-note {
  margin: 18px 0;
  padding: 11px 12px;
  border-left: 3px solid var(--teal);
  color: var(--ink-soft);
  background: var(--surface-muted);
  font-size: 13px;
}

.section-heading,
.timeline-intro {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.page-intro {
  margin-bottom: 28px;
}

.page-intro.narrow {
  max-width: 820px;
}

.page-intro > p:last-child {
  max-width: 740px;
  margin: 10px 0 0;
}

.filter-bar {
  position: relative;
  margin-bottom: 14px;
  padding: 14px;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 190px 150px auto;
  align-items: end;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.search-field {
  position: relative;
}

.search-field input {
  padding-left: 46px;
}

.select-field {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 700;
}

.select-field select {
  margin-top: 4px;
  color: var(--ink);
  font-size: 15px;
}

.result-summary {
  min-height: 28px;
  margin: 8px 2px 16px;
  color: var(--ink-muted);
  font-size: 14px;
}

.nav-badge,
.bottom-badge {
  display: inline-grid;
  place-items: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: 999px;
  color: #fff;
  background: var(--navy);
  font-size: 11px;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.nav-badge {
  margin-left: auto;
}

.literature-preview {
  margin: 0 0 20px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.section-copy {
  max-width: 68ch;
  margin: 5px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.literature-preview-list,
.literature-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.literature-preview-list {
  margin-top: 16px;
}

.literature-list {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.literature-row {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.literature-row:last-child {
  border-bottom: 0;
}

.literature-row.is-unread::before {
  content: "";
  position: absolute;
  inset: 20px auto auto 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
}

.literature-row.is-read {
  background: color-mix(in srgb, var(--surface-muted) 38%, var(--surface));
}

.literature-main {
  min-width: 0;
  min-height: 48px;
  padding: 18px 18px 18px 30px;
  border: 0;
  color: inherit;
  background: transparent;
  text-align: left;
  transition: background var(--transition);
}

.literature-main:hover {
  background: color-mix(in srgb, var(--blue-soft) 58%, transparent);
}

.literature-meta,
.literature-reasons {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.literature-meta {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 650;
}

.literature-meta span + span {
  position: relative;
}

.literature-meta span + span::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 50%;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: var(--line-strong);
}

.literature-meta .evidence-label {
  color: var(--teal);
}

.literature-main h3,
.literature-main h4 {
  margin: 8px 0 6px;
  overflow-wrap: anywhere;
  font-size: 18px;
  line-height: 1.42;
  letter-spacing: -0.01em;
}

.literature-main h4 {
  font-size: 16px;
}

.literature-original-title {
  display: block;
  margin: -1px 0 7px;
  overflow: hidden;
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 560;
  line-height: 1.45;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-original-title {
  margin: 8px 0 0;
  overflow: visible;
  font-size: 14px;
  white-space: normal;
}

.ai-tag {
  border-color: var(--blue-line);
  color: var(--navy);
  background: var(--blue-soft);
}

.literature-main p {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.62;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.literature-main h4 + p {
  -webkit-line-clamp: 2;
}

.literature-reasons {
  margin-top: 10px;
}

.literature-state {
  min-width: 90px;
  padding: 18px 16px 16px 8px;
  display: grid;
  justify-items: end;
  gap: 6px;
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 700;
}

.literature-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.radar-toolbar {
  margin-bottom: 10px;
  padding: 14px;
  display: grid;
  grid-template-columns: 180px 180px minmax(260px, 1fr);
  align-items: end;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.select-field input,
.select-field select {
  margin-top: 4px;
  color: var(--ink);
  font-size: 15px;
}

.radar-run-status {
  min-height: 48px;
  padding: 11px 13px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: var(--surface-muted);
  font-size: 13px;
}

.radar-run-status.is-error {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 7%, var(--surface));
}

.article-detail {
  min-width: 0;
}

.article-citation {
  margin: 8px 0 0;
  color: var(--ink-muted);
  font-size: 14px;
}

.article-actions {
  margin: 22px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feedback-reason {
  max-width: 360px;
  display: block;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.feedback-reason span {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 560;
}

.feedback-reason select {
  margin-top: 6px;
}

.article-analysis-block {
  margin-top: 18px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
}

.analysis-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.analysis-heading h3,
.analysis-section h3 {
  margin: 0;
}

.analysis-heading h3 {
  font-size: 18px;
}

.analysis-heading span {
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 700;
}

.analysis-section {
  margin-top: 16px;
}

.analysis-section h3 {
  color: var(--ink-muted);
  font-size: 13px;
}

.analysis-section p,
.analysis-section ul {
  margin: 5px 0 0;
  color: var(--ink-soft);
}

.analysis-section ul {
  padding-left: 20px;
}

.translated-abstract > p {
  margin: 14px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.evidence-details {
  margin-top: 18px;
  padding: 4px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
}

.evidence-details summary {
  min-height: 44px;
  padding: 10px 0;
  display: flex;
  align-items: center;
  color: var(--navy);
  cursor: pointer;
  font-weight: 700;
}

.evidence-details dl {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 5px 12px;
  overflow-wrap: anywhere;
}

.evidence-details dd {
  margin: 0;
}

.segmented-control,
.card-tabs {
  padding: 4px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  scrollbar-width: none;
}

.segmented-control {
  width: fit-content;
  max-width: 100%;
  margin-bottom: 20px;
}

.segmented-control::-webkit-scrollbar,
.card-tabs::-webkit-scrollbar {
  display: none;
}

.segmented-control button,
.card-tabs button {
  min-width: max-content;
  min-height: 42px;
  padding: 8px 16px;
  border: 0;
  border-radius: 7px;
  color: var(--ink-soft);
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.segmented-control button:hover,
.card-tabs button:hover {
  color: var(--navy);
  background: var(--surface-muted);
}

.segmented-control button.is-active,
.card-tabs button.is-active {
  color: var(--navy);
  background: var(--blue-soft);
  box-shadow: var(--shadow-sm);
}

.my-section-gap {
  margin-top: 20px;
}

.preference-form {
  max-width: 760px;
  margin-top: 18px;
}

.preference-form > label {
  display: block;
  margin: 15px 0 6px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.preference-form textarea {
  min-height: 88px;
}

.preference-row {
  margin-top: 16px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 20px;
}

.preference-row > label:first-child {
  min-width: 180px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.preference-row select {
  margin-top: 6px;
}

.preference-actions {
  justify-content: space-between;
}

.hidden-literature-list,
.usage-list {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.hidden-literature-item,
.usage-item {
  min-width: 0;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
}

.hidden-literature-item h4 {
  margin: 7px 0 4px;
  overflow-wrap: anywhere;
}

.hidden-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
}

.usage-date {
  max-width: 210px;
  margin-top: 18px;
  display: block;
}

.usage-summary {
  margin: 14px 0 8px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.usage-item strong,
.usage-item span {
  display: block;
}

.usage-item span {
  color: var(--ink-muted);
  font-size: 13px;
}

.card-tabs {
  margin: 22px 0 18px;
}

.card-tab-panel {
  min-width: 0;
}

.note-composer,
.version-composer,
.topic-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
}

.note-composer label,
.version-composer > label,
.topic-item > label {
  display: block;
  margin: 14px 0 6px;
  font-size: 14px;
  font-weight: 700;
}

.note-composer label:first-child,
.version-composer > label:first-of-type {
  margin-top: 0;
}

.note-composer textarea,
.version-composer textarea,
.topic-item textarea {
  min-height: 110px;
}

.note-actions,
.topic-actions {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.note-timeline,
.version-list,
.topic-list {
  display: grid;
  gap: 12px;
}

.note-timeline,
.version-composer {
  margin-top: 18px;
}

.note-item,
.version-item {
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.note-meta,
.version-item,
.version-item > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.note-meta,
.version-item span {
  color: var(--ink-muted);
  font-size: 12px;
}

.note-item > p {
  margin: 10px 0;
  overflow-wrap: anywhere;
  color: var(--ink-soft);
}

.note-edit-form {
  margin-top: 10px;
}

.note-checks {
  display: grid;
  gap: 6px;
}

.note-checks label {
  min-height: 44px;
  padding: 9px 10px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  align-items: start;
  gap: 9px;
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: var(--surface);
  font-size: 14px;
}

.note-checks input,
.switch-label input {
  width: auto;
  min-height: auto;
  margin: 3px 0 0;
}

.topic-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.topic-item {
  min-width: 0;
}

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

.topic-heading h4,
.version-composer h3 {
  margin: 0;
}

.topic-heading span {
  color: var(--ink-muted);
  font-size: 12px;
}

.switch-label {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.range-label output {
  float: right;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}

.topic-item input[type="range"] {
  min-height: 36px;
  padding: 0;
}

.topic-new {
  border-style: dashed;
}

.danger-text {
  margin-right: auto;
  color: var(--danger);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.card-list {
  display: grid;
  gap: 10px;
}

.compact-list {
  margin-top: 18px;
}

.knowledge-card {
  position: relative;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  color: inherit;
  background: var(--surface);
  text-align: left;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

button.knowledge-card {
  width: 100%;
}

.knowledge-card:hover {
  border-color: var(--blue-line);
  background: var(--surface-raised);
  box-shadow: 0 7px 22px rgba(18, 45, 68, 0.07);
}

.knowledge-card.is-project {
  border-left: 4px solid var(--teal);
}

.knowledge-card.is-candidate {
  border-left: 4px solid var(--warning);
}

.card-meta,
.tag-row,
.evidence-row,
.progress-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
}

.card-meta {
  margin-bottom: 9px;
}

.badge {
  min-height: 26px;
  padding: 5px 8px;
  color: var(--ink-soft);
  background: var(--surface-muted);
}

.badge.project {
  border-color: color-mix(in srgb, var(--teal) 30%, var(--line));
  color: var(--teal);
  background: color-mix(in srgb, var(--teal) 7%, var(--surface));
}

.badge.candidate {
  border-color: color-mix(in srgb, var(--warning) 30%, var(--line));
  color: var(--warning);
  background: color-mix(in srgb, var(--warning) 7%, var(--surface));
}

.knowledge-card h3,
.knowledge-card h4 {
  margin: 0 0 7px;
  font-size: 18px;
  line-height: 1.38;
  letter-spacing: -0.01em;
}

.knowledge-card p {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.knowledge-card .card-foot {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  color: var(--ink-muted);
  font-size: 12px;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 38px 24px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  background: var(--surface);
  text-align: center;
}

.empty-state h3 {
  margin: 0 0 6px;
  color: var(--ink);
}

.empty-state p {
  margin: 0;
}

.composer textarea {
  min-height: 210px;
}

.optional {
  color: var(--ink-muted);
  font-weight: 500;
}

.composer-meta {
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.composer-meta p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 13px;
}

.question-starters h3 {
  margin-bottom: 13px;
}

.question-starters button {
  width: 100%;
  min-height: 48px;
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink-soft);
  background: transparent;
  text-align: left;
  font-size: 14px;
  line-height: 1.45;
}

.question-starters button:last-child {
  border-bottom: 0;
}

.question-starters button:hover {
  color: var(--navy);
  background: var(--blue-soft);
}

.answer-panel {
  margin-top: 20px;
  border-color: var(--blue-line);
}

.answer-header {
  padding-bottom: 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
}

.answer-header h3 {
  margin: 0 0 7px;
  font-size: 22px;
}

.markdown-body {
  max-width: 76ch;
  padding-top: 6px;
  color: var(--ink-soft);
}

.markdown-body h2,
.markdown-body h3 {
  margin: 28px 0 10px;
  color: var(--ink);
  line-height: 1.35;
}

.markdown-body h2 { font-size: 20px; }
.markdown-body h3 { font-size: 17px; }
.markdown-body p { margin: 10px 0; }
.markdown-body ul { padding-left: 22px; }
.markdown-body strong { color: var(--ink); }
.markdown-body code {
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--navy);
  background: var(--blue-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

.markdown-body blockquote {
  margin: 16px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--warning);
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--warning) 6%, var(--surface));
}

.candidate-box,
.source-box {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
}

.candidate-box h4,
.source-box h4 {
  margin: 0 0 7px;
}

.candidate-actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.history-section {
  margin-top: 20px;
}

.history-list {
  margin-top: 16px;
  display: grid;
  gap: 0;
}

.history-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.history-item:last-child {
  border-bottom: 0;
}

.history-item strong {
  display: block;
  color: var(--ink);
}

.history-item span {
  color: var(--ink-muted);
  font-size: 13px;
}

#view-my .content-section + .content-section {
  margin-top: 20px;
}

#view-my .card-grid,
#view-my .card-list {
  margin-top: 16px;
}

.timeline-intro {
  margin-bottom: 26px;
}

.timeline-list {
  position: relative;
  max-width: 820px;
  padding-left: 28px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line);
}

.timeline-item {
  position: relative;
  margin-bottom: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 12px;
  height: 12px;
  border: 3px solid var(--surface-muted);
  border-radius: 50%;
  background: var(--teal);
}

.timeline-item strong {
  display: block;
  line-height: 1.4;
}

.timeline-item time {
  color: var(--ink-muted);
  font-size: 12px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  padding: max(20px, env(safe-area-inset-top)) 16px max(20px, env(safe-area-inset-bottom));
  display: grid;
  place-items: center;
  background: rgba(10, 24, 36, 0.52);
}

.modal {
  position: relative;
  width: min(760px, 100%);
  max-height: calc(100dvh - 40px);
  overflow: auto;
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: 0 24px 80px rgba(7, 22, 33, 0.28);
}

.modal-close {
  position: sticky;
  top: 0;
  z-index: 2;
  margin: -12px -12px -36px auto;
  background: var(--surface);
}

.modal-title-block {
  padding-right: 46px;
}

.modal-title-block h2 {
  margin: 8px 0;
  font-size: clamp(25px, 4vw, 34px);
  line-height: 1.25;
}

.modal-summary {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
}

.tag-row {
  margin-top: 16px;
}

.tag {
  min-height: 25px;
  padding: 5px 8px;
  color: var(--ink-soft);
  background: var(--surface-muted);
}

.progress-block {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.progress-block h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

.progress-actions .button {
  min-height: 40px;
  padding: 8px 12px;
  font-size: 13px;
}

.edit-form label {
  display: block;
  margin-top: 16px;
  font-weight: 700;
  font-size: 14px;
}

.edit-form textarea {
  min-height: 220px;
}

.edit-actions {
  margin-top: 20px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 100;
  max-width: min(380px, calc(100vw - 32px));
  padding: 13px 16px;
  border: 1px solid var(--blue-line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  font-weight: 650;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.toast .text-button {
  min-height: 38px;
  padding: 6px 9px;
}

.skeleton {
  overflow: hidden;
  border-radius: 7px;
  background: var(--line);
  animation: pulse 1.4s ease-in-out infinite;
}

.skeleton-line {
  width: 58%;
  height: 18px;
  margin-bottom: 14px;
}

.skeleton-line.wide {
  width: 82%;
  height: 28px;
}

.skeleton-input {
  height: 48px;
  margin-top: 18px;
}

@keyframes pulse {
  50% { opacity: 0.52; }
}

.bottom-nav,
.mobile-only {
  display: none;
}

@media (max-width: 960px) {
  .auth-shell {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .auth-intro {
    max-width: 720px;
  }

  .auth-card {
    max-width: 560px;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .two-column,
  .ask-layout {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    grid-template-columns: 1fr 1fr;
  }

  .filter-bar .search-field {
    grid-column: 1 / -1;
  }

  .radar-toolbar {
    grid-template-columns: 1fr 1fr;
  }

  .radar-run-status {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .app-notice {
    inset: 8px 10px auto;
    width: auto;
    align-items: stretch;
    flex-direction: column;
  }

  body.is-offline .app-notice {
    top: 46px;
  }

  .app-notice-actions {
    justify-content: flex-end;
  }

  .install-guide {
    align-items: stretch;
    flex-direction: column;
  }

  .auth-shell {
    padding: 26px 18px 40px;
    align-content: start;
  }

  .auth-intro .eyebrow {
    margin-top: 44px;
  }

  .auth-intro h1 {
    font-size: clamp(36px, 12vw, 52px);
  }

  .auth-copy {
    font-size: 16px;
  }

  .sidebar {
    display: none;
  }

  .app-main {
    margin-left: 0;
  }

  .topbar {
    min-height: 72px;
    padding: max(12px, env(safe-area-inset-top)) 18px 12px;
  }

  .topbar-context {
    display: none;
  }

  .topbar h1 {
    font-size: 21px;
  }

  .status-chip {
    display: none;
  }

  .mobile-only {
    display: grid;
  }

  .content {
    padding: 24px 16px calc(var(--nav-height) + 34px + env(safe-area-inset-bottom));
  }

  .bottom-nav {
    position: fixed;
    inset: auto 0 0 0;
    z-index: 40;
    min-height: calc(var(--nav-height) + env(safe-area-inset-bottom));
    padding: 6px 6px max(6px, env(safe-area-inset-bottom));
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    border-top: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    backdrop-filter: blur(14px);
  }

  .bottom-nav-item {
    position: relative;
    min-width: 0;
    min-height: 54px;
    padding: 5px 2px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    border: 0;
    border-radius: 9px;
    color: var(--ink-muted);
    background: transparent;
    font-size: 11px;
    font-weight: 650;
  }

  .bottom-nav-item svg {
    width: 22px;
    height: 22px;
  }

  .bottom-nav-item.is-active {
    color: var(--navy);
    background: var(--blue-soft);
  }

  .bottom-badge {
    position: absolute;
    top: 4px;
    left: calc(50% + 7px);
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    border: 2px solid var(--surface);
    font-size: 10px;
  }

  .home-hero {
    padding: 26px 20px;
  }

  .home-hero h2,
  .page-intro h2 {
    font-size: 30px;
  }

  .hero-search {
    grid-template-columns: 1fr;
  }

  .hero-search .button {
    width: 100%;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .stat-card {
    padding: 14px;
  }

  .stat-card strong {
    font-size: 24px;
  }

  .filter-bar {
    grid-template-columns: 1fr;
    padding: 12px;
  }

  .filter-bar .search-field {
    grid-column: auto;
  }

  .literature-intro,
  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .literature-intro .button,
  .section-heading > .text-button {
    width: 100%;
  }

  .radar-toolbar {
    grid-template-columns: 1fr;
    padding: 12px;
  }

  .radar-run-status {
    grid-column: auto;
  }

  .literature-row {
    grid-template-columns: 1fr;
  }

  .literature-main {
    padding: 16px 16px 8px 28px;
  }

  .literature-state {
    min-width: 0;
    padding: 0 12px 12px 28px;
    grid-auto-flow: column;
    justify-content: space-between;
    justify-items: start;
    align-items: center;
  }

  .literature-row.is-unread::before {
    inset: 19px auto auto 11px;
  }

  .article-actions .button {
    flex: 1 1 calc(50% - 8px);
  }

  .preference-row,
  .hidden-literature-item,
  .usage-item {
    align-items: stretch;
    flex-direction: column;
  }

  .hidden-actions {
    justify-content: stretch;
  }

  .hidden-actions .button,
  .hidden-actions .text-button {
    flex: 1 1 0;
  }

  .usage-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-analysis-block {
    padding: 16px;
  }

  .card-tabs {
    margin-right: -20px;
    margin-left: -20px;
    padding-right: 20px;
    padding-left: 20px;
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .topic-list {
    grid-template-columns: 1fr;
  }

  .note-composer,
  .version-composer,
  .topic-item {
    padding: 16px;
  }

  .version-item {
    align-items: stretch;
    flex-direction: column;
  }

  .version-item .button {
    width: 100%;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .composer-meta,
  .timeline-intro,
  .answer-header {
    align-items: stretch;
    flex-direction: column;
  }

  .composer-meta .button,
  .timeline-intro .button {
    width: 100%;
  }

  .modal-backdrop {
    padding: max(8px, env(safe-area-inset-top)) 8px max(8px, env(safe-area-inset-bottom));
    place-items: end center;
  }

  .modal {
    max-height: calc(100dvh - max(8px, env(safe-area-inset-top)));
    padding: 26px 20px calc(28px + env(safe-area-inset-bottom));
    border-radius: 18px 18px 10px 10px;
  }

  .toast {
    right: 16px;
    bottom: calc(var(--nav-height) + 18px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 390px) {
  .auth-points {
    display: none;
  }

  .stat-card span {
    font-size: 12px;
  }

  .quick-links button {
    min-height: 40px;
  }

  .bottom-nav-item {
    font-size: 10px;
  }

  .literature-meta {
    gap: 4px 10px;
  }

  .literature-main h3,
  .literature-main h4 {
    font-size: 16px;
  }

  .segmented-control {
    width: 100%;
  }

  .segmented-control button {
    flex: 1 0 auto;
    padding-inline: 12px;
  }
}

@media (orientation: landscape) and (max-height: 520px) and (max-width: 960px) {
  .topbar {
    position: static;
  }

  .bottom-nav {
    position: sticky;
  }

  .content {
    padding-bottom: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ecf2f7;
    --ink-soft: #bdcbd7;
    --ink-muted: #93a7b8;
    --navy: #7eb3d9;
    --navy-hover: #96c3e2;
    --blue-soft: #17364b;
    --blue-line: #33566c;
    --teal: #75bdc8;
    --surface: #13212d;
    --surface-muted: #0d1822;
    --surface-raised: #172936;
    --line: #293b49;
    --line-strong: #425867;
    --success: #73bf9c;
    --warning: #e2b66e;
    --danger: #f18b91;
    --focus: #76b8e7;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.18);
    --shadow-md: 0 14px 38px rgba(0, 0, 0, 0.3);
  }

  .brand-mark,
  .button-primary {
    color: #0b1c29;
    background: #8cc2e5;
  }

  .button-primary:hover {
    background: #a4d0ec;
  }

  .home-hero {
    background: linear-gradient(145deg, var(--surface) 20%, var(--blue-soft) 100%);
  }

  .offline-banner {
    background: #8a5a1d;
  }

  .nav-badge,
  .bottom-badge {
    color: #0b1c29;
  }
}