:root {
  color-scheme: light dark;
  --bg: oklch(0.985 0.000 0);
  --surface: oklch(0.955 0.006 170);
  --surface-raised: oklch(1.000 0.000 0);
  --ink: oklch(0.180 0.012 170);
  --muted: oklch(0.510 0.018 170);
  --line: oklch(0.880 0.010 170);
  --primary: oklch(0.620 0.105 165);
  --primary-ink: oklch(0.990 0.000 0);
  --accent: oklch(0.690 0.140 45);
  --danger: oklch(0.610 0.180 28);
  --shadow: 0 8px 24px oklch(0.100 0.000 0 / 0.10);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 84%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 72%, transparent);
  --composer-height: 92px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: oklch(0.145 0.006 170);
  --surface: oklch(0.195 0.009 170);
  --surface-raised: oklch(0.245 0.012 170);
  --ink: oklch(0.930 0.004 170);
  --muted: oklch(0.690 0.012 170);
  --line: oklch(0.330 0.013 170);
  --primary: oklch(0.700 0.100 165);
  --primary-ink: oklch(0.130 0.006 170);
  --accent: oklch(0.760 0.135 45);
  --danger: oklch(0.700 0.160 28);
  --shadow: 0 10px 24px oklch(0.030 0.000 0 / 0.24);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 80%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 64%, transparent);
}

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

[data-theme="bamboo"] {
  color-scheme: dark;
  --bg: oklch(0.160 0.022 172);
  --surface: oklch(0.215 0.024 168);
  --surface-raised: oklch(0.270 0.026 166);
  --ink: oklch(0.940 0.010 164);
  --muted: oklch(0.705 0.026 166);
  --line: oklch(0.350 0.030 166);
  --primary: oklch(0.725 0.120 154);
  --primary-ink: oklch(0.135 0.020 166);
  --accent: oklch(0.785 0.120 64);
  --danger: oklch(0.710 0.165 28);
  --shadow: 0 10px 24px oklch(0.060 0.012 170 / 0.28);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 74%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 56%, transparent);
}

[data-theme="ink"] {
  color-scheme: dark;
  --bg: oklch(0.150 0.014 215);
  --surface: oklch(0.200 0.015 215);
  --surface-raised: oklch(0.252 0.017 212);
  --ink: oklch(0.935 0.006 210);
  --muted: oklch(0.700 0.020 210);
  --line: oklch(0.335 0.020 212);
  --primary: oklch(0.720 0.095 184);
  --primary-ink: oklch(0.125 0.014 214);
  --accent: oklch(0.770 0.118 32);
  --danger: oklch(0.710 0.165 28);
  --shadow: 0 10px 24px oklch(0.035 0.005 230 / 0.30);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 78%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 60%, transparent);
}

[data-theme="dawn"] {
  color-scheme: light;
  --bg: oklch(0.975 0.007 188);
  --surface: oklch(0.948 0.010 184);
  --surface-raised: oklch(0.998 0.002 184);
  --ink: oklch(0.190 0.016 205);
  --muted: oklch(0.500 0.024 196);
  --line: oklch(0.870 0.018 188);
  --primary: oklch(0.590 0.116 178);
  --primary-ink: oklch(0.990 0.000 0);
  --accent: oklch(0.675 0.140 24);
  --danger: oklch(0.590 0.180 28);
  --shadow: 0 8px 20px oklch(0.140 0.020 196 / 0.11);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 82%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 70%, transparent);
}

[data-theme="camellia"] {
  color-scheme: light;
  --bg: oklch(0.970 0.006 142);
  --surface: oklch(0.943 0.012 138);
  --surface-raised: oklch(0.995 0.002 142);
  --ink: oklch(0.195 0.018 154);
  --muted: oklch(0.505 0.026 154);
  --line: oklch(0.860 0.018 142);
  --primary: oklch(0.585 0.120 154);
  --primary-ink: oklch(0.990 0.000 0);
  --accent: oklch(0.635 0.142 12);
  --danger: oklch(0.585 0.175 28);
  --shadow: 0 8px 20px oklch(0.120 0.018 154 / 0.10);
  --chat-bg-overlay-start: color-mix(in oklch, var(--bg) 83%, transparent);
  --chat-bg-overlay-end: color-mix(in oklch, var(--bg) 71%, transparent);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

body {
  overflow: hidden;
}

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

button {
  border: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

textarea,
input,
select {
  color: var(--ink);
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
}

textarea {
  scrollbar-width: none;
}

textarea::-webkit-scrollbar {
  display: none;
}

textarea::-webkit-resizer {
  display: none;
}

textarea:focus,
input:focus,
select:focus,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.hidden {
  display: none !important;
}

.login-view {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(145deg, oklch(0.105 0.020 170), var(--bg) 45%),
    var(--bg);
}

.login-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.brand-mark {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--primary);
  color: var(--primary-ink);
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 18px;
}

.login-card h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.login-card p {
  margin: 0 0 22px;
  color: var(--muted);
}

.login-form {
  display: grid;
  gap: 14px;
}

.login-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
}

.login-form input {
  height: 46px;
  padding: 0 13px;
}

.form-error {
  min-height: 20px;
  color: var(--danger);
  font-size: 14px;
}

.app-shell {
  width: 100vw;
  height: 100dvh;
  display: grid;
  grid-template-columns: 288px minmax(0, 1fr) 324px;
  background: var(--bg);
  --chat-bg-image: url("/assets/default-bg.webp?v=20260618e");
}

.conversation-rail,
.tools-panel,
.settings-panel {
  min-width: 0;
  background: var(--surface);
  border-color: var(--line);
  display: flex;
  flex-direction: column;
}

.conversation-rail {
  border-right: 1px solid var(--line);
}

.tools-panel {
  border-left: 1px solid var(--line);
  overflow-y: auto;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 25;
  width: min(92vw, 360px);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  transform: translateX(104%);
  transition: transform 180ms ease;
  box-shadow: var(--shadow);
}

.app-shell.settings-open .settings-panel {
  transform: translateX(0);
}

.app-shell.settings-open .drawer-scrim {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 22;
  background: oklch(0.020 0.000 0 / 0.46);
}

.rail-head,
.panel-head,
.chat-header {
  min-height: 64px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px solid var(--line);
}

.rail-head span,
.chat-title span,
.status-text {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.new-chat-button,
.primary-button,
.secondary-button,
.ghost-button,
.chip-button,
.send-button,
.icon-button {
  min-height: 44px;
  border-radius: 8px;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.new-chat-button:active,
.primary-button:active,
.secondary-button:active,
.ghost-button:active,
.chip-button:active,
.send-button:active,
.icon-button:active {
  transform: translateY(1px);
}

.new-chat-button,
.primary-button,
.send-button {
  background: var(--primary);
  color: var(--primary-ink);
  font-weight: 700;
}

.new-chat-button {
  margin: 12px;
}

.secondary-button,
.ghost-button,
.chip-button,
.icon-button {
  background: var(--surface-raised);
  color: var(--ink);
  border: 1px solid var(--line);
}

.ghost-button {
  width: 100%;
}

.icon-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 19px;
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 12px;
}

.conversation-item {
  width: 100%;
  text-align: left;
  padding: 11px 12px;
  margin-bottom: 6px;
  background: transparent;
  color: var(--ink);
  border-radius: 8px;
}

.conversation-item strong {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 14px;
}

.conversation-item span {
  display: block;
  color: var(--muted);
  margin-top: 3px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 12px;
}

.conversation-item.active,
.conversation-item:hover {
  background: var(--surface-raised);
}

.rail-foot {
  padding: 12px;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--line);
}

.chat-shell {
  min-width: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

.chat-header {
  background: color-mix(in oklch, var(--bg) 86%, var(--surface-raised));
}

.chat-title {
  min-width: 0;
  flex: 1;
}

.chat-title strong {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

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

.chip-button {
  padding: 0 12px;
  min-width: 44px;
  color: var(--muted);
}

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 22px clamp(14px, 3vw, 36px) calc(var(--composer-height) + 20px);
  background-image:
    linear-gradient(180deg, var(--chat-bg-overlay-start), var(--chat-bg-overlay-end)),
    var(--chat-bg-image);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

.app-shell.has-custom-bg .message-list {
  background-image:
    linear-gradient(180deg, var(--chat-bg-overlay-start), var(--chat-bg-overlay-end)),
    var(--chat-bg-image);
}

.empty-state {
  min-height: 100%;
  display: grid;
  place-items: center;
  color: var(--muted);
  text-align: center;
  padding: 40px 20px;
}

.empty-state strong {
  display: block;
  color: var(--ink);
  font-size: 22px;
  margin-bottom: 8px;
}

.message-row {
  display: flex;
  gap: 10px;
  margin: 14px 0;
  align-items: flex-end;
}

.message-row.user {
  justify-content: flex-end;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--surface-raised);
  color: var(--muted);
  display: grid;
  place-items: center;
  font-weight: 700;
  flex: 0 0 auto;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.avatar.has-image {
  color: transparent;
}

.message-row.user .avatar {
  order: 2;
  background: var(--primary);
  color: var(--primary-ink);
}

.bubble {
  max-width: min(74ch, 76%);
  border-radius: 16px;
  padding: 11px 13px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  line-height: 1.58;
  background: var(--surface-raised);
  border: 1px solid var(--line);
}

.message-row.user .bubble {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: transparent;
  border-bottom-right-radius: 6px;
}

.message-row.assistant .bubble {
  border-bottom-left-radius: 6px;
}

.bubble img {
  max-width: 100%;
  border-radius: 8px;
  display: block;
}

.message-meta {
  color: var(--muted);
  font-size: 12px;
  margin-top: 6px;
}

.composer {
  position: fixed;
  left: 288px;
  right: 324px;
  bottom: 0;
  padding: 10px 18px calc(10px + env(safe-area-inset-bottom));
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.composer-row {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 44px;
  gap: 8px;
  align-items: end;
}

#composerInput {
  min-height: 44px;
  max-height: 140px;
  resize: none;
  overflow: hidden;
  padding: 11px 12px;
  line-height: 1.45;
}

.send-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 20px;
}

.attachment-chips {
  max-width: 900px;
  margin: 0 auto 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.attachment-chip {
  flex: 0 0 auto;
  padding: 6px 9px;
  border-radius: 8px;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.tool-section {
  padding: 16px;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.tool-section h2 {
  margin: 0;
  font-size: 15px;
}

.tool-section h2 small {
  display: inline;
  margin-left: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.45;
}

.tool-section textarea {
  width: 100%;
  resize: vertical;
  min-height: 86px;
  padding: 10px;
}

.model-select {
  width: 100%;
  min-height: 48px;
  padding: 10px;
  border-radius: 8px;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--ink);
}

.image-pick-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.image-pick-row .ghost-button {
  width: auto;
  padding: 0 12px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.tool-grid select {
  min-height: 44px;
  padding: 0 9px;
}

.file-input {
  display: none;
}

.field-label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
}

.field-label input,
.field-label select {
  min-height: 44px;
  padding: 0 11px;
}

.avatar-setting {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.avatar-setting strong {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
}

.avatar-setting .secondary-button {
  width: 100%;
  padding: 0 12px;
}

.avatar-preview {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.background-setting {
  display: grid;
  gap: 9px;
}

.background-preview {
  min-height: 104px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background:
    linear-gradient(135deg, color-mix(in oklch, var(--surface-raised) 80%, var(--primary)), var(--surface-raised));
  background-size: cover;
  background-position: center;
  color: var(--muted);
  font-size: 13px;
}

.background-preview.has-image {
  border-color: color-mix(in oklch, var(--primary) 55%, var(--line));
}

.background-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.background-actions .ghost-button {
  width: auto;
  padding: 0 12px;
}

.avatar-editor {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 16px;
  background: oklch(0.020 0.000 0 / 0.62);
}

.avatar-editor-card {
  width: min(420px, 100%);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.avatar-crop-stage {
  width: min(72vw, 280px);
  aspect-ratio: 1 / 1;
  margin: 18px auto 10px;
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  touch-action: none;
  cursor: grab;
}

.avatar-crop-stage:active {
  cursor: grabbing;
}

.avatar-crop-stage img {
  position: absolute;
  left: 50%;
  top: 50%;
  max-width: none;
  user-select: none;
  pointer-events: none;
}

.avatar-crop-frame {
  position: absolute;
  inset: 10px;
  border: 2px solid color-mix(in oklch, var(--primary) 72%, white);
  border-radius: 10px;
  pointer-events: none;
}

.avatar-editor-hint,
.avatar-editor-card .field-label,
.avatar-editor-actions {
  width: min(72vw, 280px);
  margin-left: auto;
  margin-right: auto;
}

.avatar-editor-card .field-label input[type="range"] {
  width: 100%;
  padding: 0;
  accent-color: var(--primary);
}

.avatar-editor-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-bottom: 18px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(110px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  max-width: min(420px, calc(100vw - 32px));
  padding: 10px 14px;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 30;
}

.mobile-only {
  display: none;
}

.drawer-scrim {
  display: none;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
    --chat-bg-image: url("/assets/default-bg-mobile.webp?v=20260618e");
  }

  .mobile-only {
    display: grid;
  }

  .conversation-rail,
  .tools-panel {
    position: fixed;
    top: 0;
    bottom: 0;
    z-index: 20;
    width: min(86vw, 340px);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  .conversation-rail {
    left: 0;
    transform: translateX(-104%);
  }

  .tools-panel {
    right: 0;
    transform: translateX(104%);
  }

  .app-shell.drawer-open .conversation-rail,
  .app-shell.tools-open .tools-panel {
    transform: translateX(0);
  }

  .app-shell.drawer-open .drawer-scrim,
  .app-shell.tools-open .drawer-scrim,
  .app-shell.settings-open .drawer-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 15;
    background: oklch(0.020 0.000 0 / 0.46);
  }

  .chat-header {
    min-height: 58px;
    padding: 8px 10px;
  }

  .header-actions {
    gap: 5px;
  }

  .chip-button {
    min-height: 44px;
    padding: 0 9px;
    font-size: 12px;
  }

  .settings-panel {
    width: min(88vw, 360px);
  }

  .message-list {
    padding: 16px 12px calc(var(--composer-height) + 18px);
  }

  .bubble {
    max-width: 78%;
    font-size: 15px;
  }

  .avatar {
    width: 30px;
    height: 30px;
  }

  .avatar-preview {
    width: 44px;
    height: 44px;
  }

  .composer {
    left: 0;
    right: 0;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
  }

  .composer-row {
    grid-template-columns: 44px minmax(0, 1fr) 44px;
  }

  .composer-row .icon-button,
  .send-button {
    width: 44px;
    height: 44px;
    min-height: 44px;
  }
}

@media (max-width: 520px) {
  .login-view {
    padding: 14px;
  }

  .login-card {
    padding: 22px;
  }

  .chat-title strong {
    font-size: 15px;
  }

  .chat-title span {
    max-width: 180px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .bubble {
    max-width: 82%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}