/* Ink & Paper — editorial workspace */
:root {
  color-scheme: light;
  --app-bg: #f7f5f0;
  --app-bg-subtle: #efece6;
  --app-surface: #fffcf7;
  --app-surface-solid: #fffcf7;
  --app-surface-muted: #f3f0ea;
  --app-sidebar: #1c1917;
  --app-sidebar-text: #e7e5e4;
  --app-sidebar-muted: #a8a29e;
  --app-sidebar-hover: #292524;
  --app-sidebar-active: #44403c;
  --app-border: #e7e5e4;
  --app-border-strong: #d6d3d1;
  --app-text: #1c1917;
  --app-text-secondary: #44403c;
  --app-text-muted: #78716c;
  --app-accent: #6366f1;
  --app-accent-strong: #4f46e5;
  --app-accent-soft: rgba(99, 102, 241, 0.1);
  --app-accent-ink: #4338ca;
  --app-danger: #b91c1c;
  --app-danger-soft: rgba(185, 28, 28, 0.08);
  --app-warning-soft: rgba(217, 119, 6, 0.12);
  --app-radius: 6px;
  --app-radius-lg: 10px;
  --app-shadow-sm: 0 1px 0 rgba(28, 25, 23, 0.06);
  --app-shadow: 0 4px 20px rgba(28, 25, 23, 0.06);
  --app-input-bg: #fffcf7;
  --app-sidebar-w: 15.5rem;
  --chat-user-bg: rgba(99, 102, 241, 0.08);
  --chat-user-border: rgba(99, 102, 241, 0.22);
  --chat-assistant-bg: var(--app-surface-solid);
  --chat-assistant-border: var(--app-border);
  --chat-meta: var(--app-text-muted);
  --chat-body: var(--app-text-secondary);
  --chat-radius: var(--app-radius-lg);
  --chat-gap: 0.75rem;
  --font-display: "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-ui: "IBM Plex Sans", system-ui, sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --app-bg: #0c0a09;
  --app-bg-subtle: #141110;
  --app-surface: #1c1917;
  --app-surface-solid: #1c1917;
  --app-surface-muted: #2a2725;
  --app-sidebar: #0c0a09;
  --app-sidebar-text: #fafaf9;
  --app-sidebar-muted: #78716c;
  --app-sidebar-hover: #1c1917;
  --app-sidebar-active: #292524;
  --app-border: #292524;
  --app-border-strong: #44403c;
  --app-text: #fafaf9;
  --app-text-secondary: #d6d3d1;
  --app-text-muted: #b8b2ac;
  --app-accent: #818cf8;
  --app-shadow-sm: 0 1px 0 rgba(0, 0, 0, 0.25);
  --app-accent-strong: #6366f1;
  --app-accent-soft: rgba(129, 140, 248, 0.12);
  --app-accent-ink: #a5b4fc;
  --app-danger-soft: rgba(248, 113, 113, 0.1);
  --app-warning-soft: rgba(251, 191, 36, 0.1);
  --app-input-bg: #141110;
  --chat-user-bg: rgba(129, 140, 248, 0.1);
  --chat-user-border: rgba(129, 140, 248, 0.25);
  --chat-assistant-bg: var(--app-surface-muted);
}

*, *::before, *::after { box-sizing: border-box; }

body.app-body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--app-text);
  background: var(--app-bg);
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--app-sidebar);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.app-header-inner {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0.65rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem 1.5rem;
  flex-wrap: wrap;
}

.app-header-brand {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  flex-shrink: 0;
}

.app-display {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  color: #fff;
  letter-spacing: -0.02em;
}

.app-display-sub {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--app-sidebar-muted);
}

.app-header-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  justify-content: center;
}

.app-nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border: none;
  border-radius: var(--app-radius);
  background: transparent;
  color: var(--app-sidebar-muted);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.app-nav-item:hover {
  background: var(--app-sidebar-hover);
  color: var(--app-sidebar-text);
}

.app-nav-item.is-active {
  background: var(--app-sidebar-active);
  color: #fff;
  box-shadow: inset 0 -2px 0 var(--app-accent);
}

.app-nav-item.is-active::before { display: none; }

.app-nav-icon {
  width: 1rem;
  height: 1rem;
  opacity: 0.75;
  flex-shrink: 0;
}

.app-nav-item.is-active .app-nav-icon { opacity: 1; }

.app-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-left: auto;
}

.app-header-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--app-sidebar-muted);
  text-decoration: none;
  padding: 0.35rem 0.5rem;
  border-radius: var(--app-radius);
  transition: color 0.15s;
}

.app-header-link:hover { color: #fff; }

.app-input-header {
  width: auto;
  min-width: 4.5rem;
  padding: 0.35rem 0.55rem;
  font-size: 0.8125rem;
}

.app-header-select-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.app-header-select-wrap::after {
  content: "";
  position: absolute;
  right: 0.55rem;
  top: 50%;
  width: 0.45rem;
  height: 0.45rem;
  pointer-events: none;
  border-right: 1.5px solid rgba(255, 255, 255, 0.55);
  border-bottom: 1.5px solid rgba(255, 255, 255, 0.55);
  transform: translateY(-65%) rotate(45deg);
}

.app-input-header-select {
  appearance: none;
  -webkit-appearance: none;
  min-width: 4.25rem;
  padding: 0.4rem 1.75rem 0.4rem 0.65rem;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.app-btn-header {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--app-sidebar-muted);
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
}

.app-btn-header.app-btn-logout {
  white-space: nowrap;
  color: #fafaf9;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.22);
  font-weight: 600;
}

.app-btn-header:hover {
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
}

.app-btn-header.app-btn-logout:hover {
  color: #fff;
  background: rgba(248, 113, 113, 0.18);
  border-color: rgba(252, 165, 165, 0.45);
}

.app-main {
  flex: 1;
  min-width: 0;
  padding: 1.75rem 1.25rem 3rem;
}

.app-page-head {
  max-width: 72rem;
  margin: 0 auto 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--app-border);
}

.app-page-head h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--app-text);
  line-height: 1.15;
}

.app-page-head p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--app-text-muted);
  max-width: 36rem;
}

.app-shell {
  max-width: 72rem;
  margin: 0 auto;
}

/* Cards & surfaces */
.app-card {
  background: var(--app-surface-solid);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  box-shadow: var(--app-shadow-sm);
  padding: 1.5rem;
}

.app-card-accent {
  border-left: 3px solid var(--app-accent);
}

.app-card-title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--app-text-muted);
  margin: 0 0 0.75rem;
}

.app-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--app-text-secondary);
  margin-bottom: 0.4rem;
}

.app-input, .app-textarea, .app-select {
  width: 100%;
  background: var(--app-input-bg);
  border: 1px solid var(--app-border-strong);
  border-radius: var(--app-radius);
  color: var(--app-text);
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.app-input, .app-select { padding: 0.5rem 0.75rem; }
.app-textarea { padding: 0.75rem; line-height: 1.55; resize: vertical; }

.app-input:focus, .app-textarea:focus, .app-select:focus {
  outline: none;
  border-color: var(--app-accent);
  box-shadow: 0 0 0 3px var(--app-accent-soft);
}

.app-header .app-input-header {
  background: var(--app-sidebar-hover);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--app-sidebar-text);
}

.app-header .app-input-header:hover {
  background: var(--app-sidebar-active);
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.app-header .app-input-header:focus {
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.08);
}

.app-textarea-editor {
  background: var(--app-surface-muted);
  border: 1px dashed var(--app-border-strong);
  border-radius: var(--app-radius);
  padding: 0.85rem;
  min-height: 12rem;
  font-size: 0.9375rem;
  line-height: 1.65;
}

.app-textarea-editor:focus {
  border-style: solid;
  border-color: var(--app-accent);
  box-shadow: 0 0 0 3px var(--app-accent-soft);
}

/* Buttons */
.app-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--app-radius);
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.app-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.app-btn-primary {
  background: var(--app-accent-strong);
  color: #fff;
}

.app-btn-primary:hover:not(:disabled) {
  background: var(--app-accent-ink);
}

.app-btn-secondary {
  background: var(--app-surface-muted);
  border-color: var(--app-border-strong);
  color: var(--app-text-secondary);
}

.app-btn-secondary:hover:not(:disabled) {
  background: var(--app-bg-subtle);
  border-color: var(--app-text-muted);
}

.app-btn-ghost {
  background: transparent;
  border-color: var(--app-border-strong);
  color: var(--app-text-muted);
}

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

.app-btn-danger-soft {
  background: var(--app-danger-soft);
  color: var(--app-danger);
}

/* Tabs — underline style */
.app-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--app-border);
}

.app-tab {
  padding: 0.55rem 1rem;
  margin-bottom: -1px;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: inherit;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--app-text-muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.app-tab:hover { color: var(--app-text-secondary); }

.app-tab.is-active {
  color: var(--app-accent-strong);
  border-bottom-color: var(--app-accent-strong);
  background: transparent;
}

.app-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 500;
  background: var(--app-accent-soft);
  color: var(--app-accent-ink);
}

.app-stat {
  background: var(--app-surface-muted);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius);
  padding: 1rem 1.1rem;
}

.app-stat-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--app-text-muted);
}

.app-stat-value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--app-text);
  margin-top: 0.15rem;
  line-height: 1.1;
}

.app-panel-muted {
  background: var(--app-surface-muted);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius);
  padding: 0.85rem 1rem;
}

.app-hint {
  font-size: 0.75rem;
  color: var(--app-text-muted);
  margin: 0.15rem 0 0.35rem;
  line-height: 1.45;
}

.app-section-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--app-text);
  margin: 0 0 0.5rem;
}

.app-field-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--app-text-secondary);
  margin-bottom: 0.2rem;
}

.app-checkbox {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
  accent-color: var(--app-accent-strong);
  border-radius: 3px;
  cursor: pointer;
}

.app-check-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: var(--app-radius);
  padding: 0.45rem 0.5rem;
  margin: 0 -0.5rem;
  color: var(--app-text);
  cursor: pointer;
  transition: background 0.15s;
}

.app-check-row--start { align-items: flex-start; }

.app-check-row:hover,
.app-check-row:focus-within {
  background: var(--app-surface-muted);
}

.app-hl-dot {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 3px;
  flex-shrink: 0;
}

.app-hl-dot--close { background: #86efac; }
.app-hl-dot--distant { background: #fde047; }
.app-hl-dot--keyword { background: #93c5fd; }

[data-theme="dark"] .app-hl-dot--close { background: #4ade80; }
[data-theme="dark"] .app-hl-dot--distant { background: #facc15; }
[data-theme="dark"] .app-hl-dot--keyword { background: #818cf8; }

.app-divider {
  border: none;
  border-top: 1px solid var(--app-border);
  margin: 1.25rem 0;
}

.app-settings-card {
  background: var(--app-surface-solid);
}

[data-theme="dark"] .app-settings-card {
  background: var(--app-surface);
  border-color: var(--app-border-strong);
}

.app-text-strong { font-weight: 600; color: var(--app-text); }

.app-result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--app-border);
  font-size: 0.875rem;
}

.app-result-row:last-child { border-bottom: none; }

.app-table-head {
  display: grid;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--app-surface-muted);
  border-bottom: 1px solid var(--app-border);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--app-text-secondary);
}

.app-table-wrap {
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  overflow: hidden;
}

.app-table-row {
  display: grid;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--app-border);
  font-size: 0.875rem;
  align-items: center;
}

.app-table-row:last-child { border-bottom: none; }

.app-text-positive { color: #15803d; font-weight: 600; }
.app-text-negative { color: #dc2626; font-weight: 700; }

[data-theme="dark"] .app-text-positive { color: #4ade80; }
[data-theme="dark"] .app-text-negative { color: #f87171; }

.app-sidebar-scroll,
.settings-sidebar-scroll {
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--app-border-strong) transparent;
}

.app-theme-toggle {
  width: 2.125rem;
  height: 2.125rem;
  border-radius: var(--app-radius);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--app-sidebar-hover);
  color: var(--app-sidebar-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 0;
  flex-shrink: 0;
  transition: color 0.15s, border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.app-theme-toggle:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.app-theme-icon { display: block; }

.app-theme-icon--moon {
  opacity: 0.85;
}

[data-theme="dark"] .app-theme-toggle {
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.18), rgba(245, 158, 11, 0.08));
  border-color: rgba(251, 191, 36, 0.42);
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.08), 0 0 14px rgba(251, 191, 36, 0.12);
}

[data-theme="dark"] .app-theme-toggle:hover {
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.28), rgba(245, 158, 11, 0.14));
  border-color: rgba(252, 211, 77, 0.62);
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.12), 0 0 18px rgba(251, 191, 36, 0.2);
}

[data-theme="dark"] .app-theme-icon--sun {
  color: #fbbf24;
  filter: drop-shadow(0 0 4px rgba(251, 191, 36, 0.45));
}

.app-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  padding: 0.6rem 1rem;
  border-radius: var(--app-radius);
  background: var(--app-text);
  color: var(--app-bg);
  font-size: 0.8125rem;
  font-weight: 500;
  box-shadow: var(--app-shadow);
}

[data-theme="dark"] .app-toast {
  background: var(--app-surface-solid);
  color: var(--app-text);
  border: 1px solid var(--app-border);
}

.app-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--app-accent-strong);
  text-decoration: none;
}

.app-link:hover { text-decoration: underline; }

.app-modal-backdrop {
  background: rgba(12, 10, 9, 0.6);
  backdrop-filter: blur(4px);
}

.app-modal {
  background: var(--app-surface-solid);
  border: 1px solid var(--app-border);
  box-shadow: var(--app-shadow);
  border-radius: var(--app-radius-lg);
}

.sidebar-fade {
  background: linear-gradient(to top, var(--app-surface-solid), transparent);
}

/* Text analysis highlights */
mark.rep-close,
mark.rep-distant,
mark.kw {
  color: inherit;
  padding: 0.12em 0.22em;
  margin: 0 0.02em;
  border-radius: 3px;
  font-weight: 500;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

mark.rep-close { background: rgba(134, 239, 172, 0.55); }
mark.rep-distant { background: rgba(253, 224, 71, 0.55); }
mark.kw { background: rgba(165, 180, 252, 0.45); }

[data-theme="dark"] mark.rep-close {
  background: rgba(34, 197, 94, 0.32);
  color: #dcfce7;
  box-shadow: inset 0 0 0 1px rgba(74, 222, 128, 0.45);
}

[data-theme="dark"] mark.rep-distant {
  background: rgba(234, 179, 8, 0.3);
  color: #fef9c3;
  box-shadow: inset 0 0 0 1px rgba(250, 204, 21, 0.42);
}

[data-theme="dark"] mark.kw {
  background: rgba(99, 102, 241, 0.34);
  color: #e0e7ff;
  box-shadow: inset 0 0 0 1px rgba(129, 140, 248, 0.48);
}

.app-highlight-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
  margin-bottom: 0.85rem;
  font-size: 0.8125rem;
  color: var(--app-text-secondary);
}

.app-highlight-legend > span:first-child {
  font-weight: 600;
  color: var(--app-text-muted);
}

.app-highlight-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.app-highlight-legend .app-hl-dot {
  width: 0.875rem;
  height: 0.875rem;
}

.app-highlight-text {
  background: var(--app-surface-muted);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius);
  padding: 1rem 1.15rem;
  line-height: 1.65;
  font-size: 0.9375rem;
  color: var(--app-text);
  max-height: 28rem;
  overflow-y: auto;
  white-space: pre-wrap;
}

[data-theme="dark"] .app-highlight-text {
  background: #12100e;
  border-color: var(--app-border-strong);
}

.app-highlight-summary {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--app-text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* Chat */
.chat-shell {
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  background: var(--app-surface-solid);
  overflow: hidden;
}

.chat-shell-head {
  border-bottom: 1px solid var(--app-border);
  background: var(--app-surface-muted);
  padding: 0.5rem 0.75rem;
}

.chat-panel {
  display: flex;
  flex-direction: column;
  min-height: 28rem;
  max-height: 36rem;
}

.chat-thread {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--chat-gap);
  padding: 0.75rem;
  scroll-behavior: smooth;
}

.chat-thread::-webkit-scrollbar { width: 5px; }
.chat-thread::-webkit-scrollbar-thumb { background: var(--app-border-strong); border-radius: 99px; }

.chat-msg {
  border-radius: var(--chat-radius);
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--chat-assistant-border);
  max-width: 90%;
}

.chat-msg-user {
  align-self: flex-end;
  background: var(--chat-user-bg);
  border-color: var(--chat-user-border);
}

.chat-msg-assistant {
  align-self: flex-start;
  background: var(--chat-assistant-bg);
}

.chat-msg-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  margin-bottom: 0.3rem;
  font-size: 0.6875rem;
  color: var(--chat-meta);
}

.chat-msg-role {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--app-text-muted);
}

.chat-msg-user .chat-msg-role { color: var(--app-accent-strong); }

.chat-msg-body, .chat-prose-inner {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--chat-body);
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-jump-btn {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  z-index: 5;
  padding: 0.35rem 0.7rem;
  border-radius: var(--app-radius);
  font-size: 0.72rem;
  font-weight: 500;
  font-family: inherit;
  background: var(--app-surface-solid);
  border: 1px solid var(--app-border-strong);
  color: var(--app-text-secondary);
  cursor: pointer;
  box-shadow: var(--app-shadow-sm);
}

.chat-jump-btn:hover {
  border-color: var(--app-accent);
  color: var(--app-accent-strong);
}

.chat-typing { font-size: 0.75rem; color: var(--app-text-muted); padding: 0.25rem; }

.chat-prose-inner h1, .chat-prose-inner h2 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--app-text);
}

.chat-prose-inner h1 { font-size: 1.25rem; margin: 0.6rem 0 0.35rem; }
.chat-prose-inner h2 { font-size: 1.1rem; margin: 0.5rem 0 0.3rem; border-bottom: 1px solid var(--app-border); padding-bottom: 0.15rem; }
.chat-prose-inner p { margin: 0.4rem 0; }
.chat-prose-inner ul, .chat-prose-inner ol { margin: 0.35rem 0; padding-left: 1.2rem; }
.chat-prose-inner th, .chat-prose-inner td { border: 1px solid var(--app-border); padding: 0.35rem 0.5rem; }
.chat-prose-inner th { background: var(--app-surface-muted); }
.chat-prose-inner a { color: var(--app-accent-strong); }
.chat-prose-inner blockquote { border-left: 3px solid var(--app-accent); padding-left: 0.65rem; color: var(--app-text-muted); margin: 0.4rem 0; }
.chat-prose-inner pre { background: var(--app-sidebar); color: #e7e5e4; padding: 0.65rem; border-radius: var(--app-radius); overflow-x: auto; font-size: 0.75rem; }
.chat-prose-inner code { background: var(--app-surface-muted); padding: 0.1em 0.3em; border-radius: 3px; font-size: 0.85em; }

.chat-view-toggle {
  display: inline-flex;
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius);
  overflow: hidden;
}

.chat-view-toggle button {
  padding: 0.25rem 0.5rem;
  font-size: 0.68rem;
  font-weight: 500;
  font-family: inherit;
  border: none;
  background: var(--app-surface-solid);
  color: var(--app-text-muted);
  cursor: pointer;
}

.chat-view-toggle button.active {
  background: var(--app-accent-soft);
  color: var(--app-accent-strong);
}

.app-stem-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.app-stem-toggle-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--app-text-muted);
  transition: color 0.15s ease;
}

.app-stem-toggle-label.is-active {
  color: var(--app-text);
  font-weight: 600;
}

.app-stem-toggle-switch {
  position: relative;
  width: 2.75rem;
  height: 1.5rem;
  border: none;
  border-radius: 999px;
  background: var(--app-border);
  cursor: pointer;
  padding: 0;
  transition: background 0.2s ease;
  flex-shrink: 0;
}

.app-stem-toggle-switch.is-on {
  background: #22c55e;
}

.app-stem-toggle-knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s ease;
}

.app-stem-toggle-switch.is-on .app-stem-toggle-knob {
  transform: translateX(1.25rem);
}

.app-rep-frequency-list {
  columns: 2;
  column-gap: 1.5rem;
}

.app-rep-frequency-row {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.1rem 0;
  break-inside: avoid;
  font-size: 0.8125rem;
  font-family: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;
}

.app-rep-frequency-word {
  color: var(--app-text);
  font-weight: 500;
}

.app-rep-frequency-sep {
  color: var(--app-text-muted);
}

.app-rep-frequency-count {
  color: var(--app-accent-strong);
  font-weight: 600;
}

.app-rep-tab {
  font-size: 0.875rem;
}

.app-rep-formula {
  margin-bottom: 0.35rem;
}

.app-rep-summary {
  margin: 0 0 0.6rem;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--app-text-secondary);
  white-space: pre-wrap;
}

.app-rep-block {
  padding: 0.55rem 0.7rem;
  margin-bottom: 0.55rem;
}

.app-rep-block-title {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0 0 0.3rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--app-text);
}

.app-rep-block-title--stats {
  font-size: 0.9375rem;
  margin-bottom: 0.4rem;
}

.app-rep-block-title--stats .app-rep-dot {
  width: 0.5rem;
  height: 0.5rem;
}

.app-rep-block-hint {
  margin: 0 0 0.35rem;
  font-size: 0.6875rem;
  line-height: 1.35;
  color: var(--app-text-muted);
}

.app-rep-dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.app-rep-dot--close { background: #86efac; }
.app-rep-dot--distant { background: #fde047; }

.app-rep-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.15rem 0;
  border-bottom: 1px solid var(--app-border);
  font-size: 0.8125rem;
}

.app-rep-stat-row:last-child {
  border-bottom: none;
}

.app-rep-stat-row span:first-child {
  font-weight: 500;
  color: var(--app-text);
}

.app-rep-stat-row span:last-child {
  font-weight: 600;
  color: var(--app-text-secondary);
}

.app-rep-empty {
  margin: 0;
  padding: 0.15rem 0;
  font-size: 0.8125rem;
  color: var(--app-text-muted);
}

.app-rep-stats-grid {
  margin-top: 0;
}

@media (max-width: 640px) {
  .app-rep-frequency-list {
    columns: 1;
  }
}

/* Login */
.app-login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: var(--app-bg);
  position: relative;
}

.app-login-theme {
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 2rem;
  height: 2rem;
  border-radius: var(--app-radius);
  border: 1px solid var(--app-border-strong);
  background: var(--app-surface-solid);
  color: var(--app-text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 0;
}

.app-login-theme:hover {
  color: var(--app-text);
  border-color: var(--app-accent);
}

.app-login-panel {
  width: 100%;
  max-width: 24rem;
}

.app-login-brand {
  text-align: center;
  margin-bottom: 1.5rem;
}

.app-login-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1;
  color: var(--app-text);
  margin: 0;
  letter-spacing: -0.02em;
}

.app-login-subtitle {
  font-family: var(--font-ui);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--app-text-muted);
  margin: 0.5rem 0 0;
}

.app-login-card {
  background: var(--app-surface-solid);
  border: 1px solid var(--app-border);
  border-radius: var(--app-radius-lg);
  padding: 1.75rem;
  box-shadow: var(--app-shadow);
}

.app-login-heading {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--app-text);
  margin: 0 0 0.35rem;
}

.app-login-lead {
  font-size: 0.875rem;
  color: var(--app-text-muted);
  margin: 0 0 1.25rem;
  line-height: 1.5;
}

.app-login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-login-submit {
  width: 100%;
  margin-top: 0.25rem;
}

.app-login-alert {
  font-size: 0.8125rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--app-radius);
  margin: 0 0 1rem;
}

.app-login-alert-warn {
  color: var(--app-text-secondary);
  background: var(--app-warning-soft);
  border: 1px solid var(--app-border);
}

.app-login-alert-error {
  color: var(--app-danger);
  background: var(--app-danger-soft);
  border: 1px solid var(--app-border);
}

/* Utilities */
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8125rem;
}

.focus-ring:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--app-surface-solid), 0 0 0 4px var(--app-accent);
}

.spinner {
  border: 2px solid var(--app-border);
  border-top-color: var(--app-accent);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.app-text-muted { color: var(--app-text-muted); }
.app-text-secondary { color: var(--app-text-secondary); }

/* Dark theme — legacy Tailwind slate utilities still in markup */
[data-theme="dark"] .text-slate-800,
[data-theme="dark"] .text-slate-700 { color: var(--app-text); }

[data-theme="dark"] .text-slate-600 { color: var(--app-text-secondary); }

[data-theme="dark"] .text-slate-500,
[data-theme="dark"] .text-slate-400 { color: var(--app-text-muted); }

[data-theme="dark"] .border-slate-200,
[data-theme="dark"] .border-slate-100 { border-color: var(--app-border); }

[data-theme="dark"] .bg-slate-100 {
  background: var(--app-surface-muted);
  color: var(--app-text-secondary);
}

[data-theme="dark"] .bg-white { background: var(--app-surface-solid); }

[data-theme="dark"] .hover\:bg-slate-50:hover,
[data-theme="dark"] .hover\:bg-white\/80:hover {
  background: var(--app-surface-muted);
}

[data-theme="dark"] .text-green-700 { color: #4ade80; }
[data-theme="dark"] .text-red-600 { color: #f87171; }

[data-theme="dark"] .bg-amber-50 {
  background: var(--app-warning-soft);
  border-color: rgba(251, 191, 36, 0.35);
  color: var(--app-text-secondary);
}

[data-theme="dark"] .border-amber-200 { border-color: rgba(251, 191, 36, 0.35); }

[data-theme="dark"] .border-slate-300 { border-color: var(--app-border-strong); }

[data-theme="dark"] select.app-select option {
  background: var(--app-surface-solid);
  color: var(--app-text);
}

@media (max-width: 768px) {
  .app-header-inner {
    padding: 0.6rem 1rem;
    gap: 0.65rem;
  }
  .app-header-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }
  .app-header-actions {
    margin-left: 0;
    flex-wrap: wrap;
  }
  .app-main { padding: 1.25rem 1rem 2.5rem; }
  .app-page-head h2 { font-size: 1.5rem; }
}