:root {
  color-scheme: dark;
  --bg: #0b0c10;
  --panel: #12141a;
  --panel-2: #171a22;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f4f5f7;
  --muted: #9aa3af;
  --soft: #c8ced8;
  --accent: #ba6544;
  --accent-2: #36c4b5;
  --good: #5bd178;
  --warn: #f2b84b;
  --danger: #ff6b6b;
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
}

html.light {
  color-scheme: light;
  --bg: #f6f7f8;
  --panel: #ffffff;
  --panel-2: #eef1f4;
  --line: rgba(15, 23, 42, 0.1);
  --text: #16181d;
  --muted: #667085;
  --soft: #2b313a;
  --accent: #b95d39;
  --accent-2: #078c84;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  display: grid;
  grid-template-columns: 228px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 14px 12px;
  overflow: hidden;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #282d36 72%);
  color: #fff;
  font-weight: 900;
}

.brand-name {
  font-weight: 900;
  color: var(--accent);
  line-height: 1.1;
}

.brand-sub {
  color: var(--muted);
  font-size: 11px;
}

.new-chat-btn,
.primary-btn,
.secondary-btn,
.login-btn {
  border: 0;
  cursor: pointer;
  border-radius: 8px;
  transition: 0.16s ease;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 10px;
  padding: 10px 12px;
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  text-align: left;
}

.new-chat-btn:hover,
.tool-item:hover,
.icon-btn:hover,
.login-btn:hover,
.conversation-item:hover {
  background: color-mix(in srgb, var(--text) 9%, transparent);
}

.tool-nav {
  display: grid;
  gap: 4px;
  overflow-y: auto;
  padding-right: 2px;
}

.tool-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  border: 0;
  cursor: pointer;
  color: var(--muted);
  background: transparent;
  padding: 9px 10px;
  border-radius: 8px;
  text-align: left;
  transition: 0.16s ease;
}

.tool-item.active {
  color: var(--text);
  background: color-mix(in srgb, var(--text) 10%, transparent);
}

.tool-icon {
  width: 20px;
  text-align: center;
}

.sidebar-section {
  min-height: 0;
  display: flex;
  flex-direction: column;
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
  flex: 1;
}

.section-title {
  font-size: 11px;
  color: var(--muted);
  margin: 0 8px 8px;
}

.conversation-list {
  display: grid;
  gap: 4px;
  min-height: 0;
  overflow-y: auto;
}

.conversation-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  border: 0;
  cursor: pointer;
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 8px;
  text-align: left;
}

.conversation-item.active {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
}

.conversation-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.delete-conversation {
  opacity: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.conversation-item:hover .delete-conversation {
  opacity: 1;
}

.quota-card {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.quota-top {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

.quota-bar {
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 10%, transparent);
  overflow: hidden;
}

.quota-bar span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.main {
  min-width: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 58px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
  z-index: 2;
}

.page-title {
  font-weight: 800;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.model-select,
.form input,
.form textarea,
.admin-input,
.composer textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  outline: none;
}

.model-select {
  max-width: 250px;
  padding: 8px 10px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.login-btn {
  padding: 8px 12px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
}

.content {
  min-height: 0;
  flex: 1;
}

.chat-layout {
  height: 100%;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
}

.messages {
  min-height: 0;
  overflow-y: auto;
  padding: 32px max(18px, calc((100vw - 980px) / 2)) 18px;
}

.welcome {
  max-width: 900px;
  margin: 7vh auto 0;
}

.welcome-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 5px 9px;
  margin-bottom: 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 8px;
  color: color-mix(in srgb, var(--accent) 80%, var(--text));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-size: 12px;
}

.welcome h1 {
  margin: 0 0 10px;
  font-size: 34px;
  line-height: 1.15;
}

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

.prompt-grid,
.feature-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.prompt-card,
.feature-card,
.price-card,
.panel-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 14px;
  box-shadow: none;
}

.prompt-card {
  cursor: pointer;
  color: var(--soft);
  text-align: left;
}

.prompt-card:hover,
.feature-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.prompt-card strong,
.feature-card strong {
  display: block;
  color: var(--text);
  margin-bottom: 8px;
}

.message {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  max-width: 920px;
  margin: 0 auto 18px;
}

.avatar {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 800;
}

.message.user .avatar {
  background: color-mix(in srgb, var(--accent) 25%, var(--panel));
  color: var(--text);
}

.bubble {
  min-width: 0;
  color: var(--soft);
  line-height: 1.72;
  white-space: pre-wrap;
}

.bubble pre {
  overflow: auto;
  padding: 12px;
  border-radius: 8px;
  background: #090a0d;
  border: 1px solid var(--line);
}

.composer-wrap {
  padding: 12px max(18px, calc((100vw - 980px) / 2)) 18px;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  gap: 8px;
  align-items: end;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 8px;
  box-shadow: var(--shadow);
}

.composer textarea {
  min-height: 46px;
  max-height: 160px;
  resize: vertical;
  border: 0;
  background: transparent;
  padding: 10px 8px;
}

.send-btn {
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  color: #fff;
  background: var(--accent);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status-line {
  max-width: 920px;
  margin: 0 auto 8px;
  color: var(--muted);
  font-size: 12px;
}

.page-panel {
  max-width: 1100px;
  margin: 0 auto;
  padding: 34px 22px;
}

.page-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 18px;
}

.page-panel h1 {
  margin: 0 0 10px;
  font-size: 30px;
}

.page-panel p {
  color: var(--muted);
  line-height: 1.75;
}

.feature-card .meta {
  color: var(--muted);
  font-size: 13px;
}

.tool-matrix,
.gallery-grid,
.account-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.matrix-card,
.work-card,
.news-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 14px;
}

.matrix-card {
  min-height: 142px;
  cursor: pointer;
  text-align: left;
}

.matrix-card span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  margin-bottom: 14px;
}

.matrix-card strong,
.work-card strong,
.news-item strong {
  display: block;
  margin-bottom: 8px;
}

.matrix-card em,
.work-card p,
.news-item p,
.policy-page p {
  color: var(--muted);
  font-style: normal;
  line-height: 1.65;
}

.workspace-page {
  height: 100%;
  overflow: auto;
  padding: 24px;
}

.tool-workbench {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(360px, 1fr);
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto 16px;
  align-items: stretch;
}

.tool-copy,
.task-form,
.task-column {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.workspace-kicker {
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.tool-copy h1 {
  margin: 10px 0;
  font-size: 32px;
}

.tool-copy p {
  color: var(--muted);
  line-height: 1.75;
}

.task-form {
  display: grid;
  gap: 12px;
}

.task-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.task-form textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 52px;
  resize: vertical;
  padding: 10px;
  background: var(--panel-2);
  color: var(--text);
  outline: none;
}

.task-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.task-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}

.task-column h3 {
  margin: 0 0 12px;
  font-size: 15px;
}

.task-item {
  padding: 10px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--soft);
  background: var(--panel-2);
}

.work-thumb {
  display: grid;
  place-items: center;
  height: 150px;
  border-radius: 8px;
  margin-bottom: 12px;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg, #ba6544, #2d353f);
}

.tone-2 {
  background: linear-gradient(135deg, #36c4b5, #263238);
}

.tone-3 {
  background: linear-gradient(135deg, #6b7cff, #232733);
}

.tone-4 {
  background: linear-gradient(135deg, #d49b45, #263238);
}

.work-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

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

.news-item span {
  color: var(--muted);
  font-size: 12px;
}

.price-card {
  display: grid;
  gap: 12px;
}

.price {
  font-size: 30px;
  font-weight: 900;
}

.primary-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  color: #fff;
  background: var(--accent);
}

.secondary-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 10px 14px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.55);
  z-index: 20;
}

.hidden {
  display: none !important;
}

.modal-panel {
  width: min(380px, calc(100vw - 28px));
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 18px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.modal-title {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 14px;
}

.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}

.tab {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  padding: 8px;
  cursor: pointer;
}

.tab.active {
  color: var(--text);
  background: var(--panel-2);
}

.form {
  display: grid;
  gap: 12px;
}

.form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.form input,
.form textarea {
  padding: 10px 11px;
}

.form-error {
  min-height: 18px;
  color: var(--danger);
  font-size: 13px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: 360px;
  padding: 12px 14px;
  border-radius: 8px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  z-index: 30;
}

.only-mobile {
  display: none;
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    z-index: 10;
    width: min(84vw, 290px);
    transform: translateX(-105%);
    transition: transform 0.18s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .only-mobile {
    display: grid;
  }

  .topbar {
    padding: 10px 12px;
  }

  .page-title {
    display: none;
  }

  .model-select {
    max-width: 150px;
  }

  .prompt-grid,
  .feature-grid,
  .pricing-grid,
  .tool-matrix,
  .gallery-grid,
  .account-grid,
  .tool-workbench,
  .task-board {
    grid-template-columns: 1fr;
  }

  .page-head {
    display: grid;
  }

  .workspace-page {
    padding: 14px;
  }

  .welcome {
    margin-top: 18px;
  }

  .welcome h1 {
    font-size: 26px;
  }
}