:root {
  color-scheme: light;
  --tool-bg: oklch(97.2% 0.008 248);
  --tool-surface: oklch(99.4% 0.003 248);
  --tool-surface-muted: oklch(95.5% 0.014 248);
  --tool-ink: oklch(25% 0.045 252);
  --tool-ink-soft: oklch(42% 0.035 252);
  --tool-muted: oklch(50% 0.025 252);
  --tool-border: oklch(88% 0.018 248);
  --tool-navy: oklch(32% 0.105 252);
  --tool-navy-hover: oklch(27% 0.105 252);
  --tool-teal: oklch(52% 0.095 178);
  --tool-teal-soft: oklch(94% 0.035 178);
  --tool-blue-soft: oklch(94.5% 0.033 248);
  --tool-error: oklch(48% 0.17 25);
  --tool-error-soft: oklch(96% 0.025 25);
  --tool-warning: oklch(52% 0.12 75);
  --tool-warning-soft: oklch(96% 0.035 75);
  --tool-success: oklch(45% 0.105 155);
  --tool-radius: 14px;
  --tool-radius-control: 10px;
  --tool-ease: 180ms cubic-bezier(.22, 1, .36, 1);
  --tool-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { min-width: 320px; background: var(--tool-bg); }
body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--tool-ink);
  background: var(--tool-bg);
  font-family: var(--tool-sans);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 50;
  padding: 10px 14px;
  color: white;
  background: var(--tool-navy);
  border-radius: var(--tool-radius-control);
  transform: translateY(-160%);
  transition: transform var(--tool-ease);
}
.skip-link:focus { transform: translateY(0); }

.tool-header {
  min-height: 68px;
  border-bottom: 1px solid var(--tool-border);
  background: color-mix(in oklch, var(--tool-bg), white 35%);
}
.tool-header-inner {
  width: min(1120px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.tool-brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.tool-mark {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: var(--tool-navy);
  font-size: 17px;
  font-weight: 800;
}
.tool-brand-text { min-width: 0; }
.tool-brand-name { display: block; color: var(--tool-navy); font-size: 15px; font-weight: 800; }
.tool-page-name { display: block; margin-top: 1px; color: var(--tool-muted); font-size: 12px; }
.back-link {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 13px;
  border: 1px solid var(--tool-border);
  border-radius: var(--tool-radius-control);
  color: var(--tool-ink-soft);
  background: var(--tool-surface);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: color var(--tool-ease), border-color var(--tool-ease), background var(--tool-ease);
}
.back-link:hover { color: var(--tool-navy); border-color: var(--tool-navy); background: var(--tool-blue-soft); }

.tool-main { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 42px 0 64px; }
.tool-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--tool-border);
}
.tool-intro-copy { max-width: 720px; }
.tool-label { margin: 0 0 10px; color: var(--tool-teal); font-size: 13px; font-weight: 800; }
.tool-intro h1 { margin: 0; color: var(--tool-navy); font-size: 34px; line-height: 1.22; letter-spacing: -.025em; text-wrap: balance; }
.tool-intro p { max-width: 65ch; margin: 12px 0 0; color: var(--tool-ink-soft); font-size: 15px; line-height: 1.75; text-wrap: pretty; }
.tool-audience {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  border-radius: 999px;
  color: var(--tool-navy);
  background: var(--tool-blue-soft);
  font-size: 12px;
  font-weight: 750;
}
.tool-audience::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--tool-teal); }

.workspace { padding-top: 30px; }
.panel {
  padding: 26px;
  border: 1px solid var(--tool-border);
  border-radius: var(--tool-radius);
  background: var(--tool-surface);
}
.panel + .panel { margin-top: 16px; }
.panel-heading { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.panel-heading h2 { margin: 0; color: var(--tool-navy); font-size: 18px; letter-spacing: -.012em; }
.panel-heading p { margin: 6px 0 0; color: var(--tool-muted); font-size: 13px; line-height: 1.6; }

.field { margin-bottom: 18px; }
.field label { display: block; margin-bottom: 7px; color: var(--tool-ink-soft); font-size: 13px; font-weight: 700; }
.field-hint { margin: 7px 0 0; color: var(--tool-muted); font-size: 12px; line-height: 1.5; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--tool-border);
  border-radius: var(--tool-radius-control);
  outline: none;
  color: var(--tool-ink);
  background: white;
  transition: border-color var(--tool-ease), box-shadow var(--tool-ease), background var(--tool-ease);
}
textarea { min-height: 112px; padding: 13px 14px; resize: vertical; line-height: 1.65; }
select { min-height: 44px; padding: 0 40px 0 13px; }
input:hover, select:hover, textarea:hover { border-color: color-mix(in oklch, var(--tool-navy), white 58%); }
input:focus-visible, select:focus-visible, textarea:focus-visible { border-color: var(--tool-navy); box-shadow: 0 0 0 3px color-mix(in oklch, var(--tool-navy), transparent 82%); }
textarea::placeholder, input::placeholder { color: oklch(48% 0.025 252); opacity: 1; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-grid .field { margin-bottom: 0; }

.quick-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 14px; }
.quick-button, .suggestion {
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid var(--tool-border);
  border-radius: 999px;
  color: var(--tool-ink-soft);
  background: var(--tool-surface);
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
  transition: color var(--tool-ease), border-color var(--tool-ease), background var(--tool-ease);
}
.quick-button:hover, .suggestion:hover { color: var(--tool-navy); border-color: var(--tool-navy); background: var(--tool-blue-soft); }

.primary-button, .secondary-button, .copy-button, .state-action {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  border-radius: var(--tool-radius-control);
  cursor: pointer;
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
  transition: background var(--tool-ease), border-color var(--tool-ease), color var(--tool-ease), transform var(--tool-ease);
}
.primary-button { border: 1px solid var(--tool-navy); color: white; background: var(--tool-navy); }
.primary-button:hover { background: var(--tool-navy-hover); }
.primary-button:active, .secondary-button:active, .copy-button:active { transform: translateY(1px); }
.primary-button:disabled { border-color: var(--tool-border); color: var(--tool-muted); background: var(--tool-surface-muted); cursor: wait; transform: none; }
.secondary-button, .copy-button, .state-action { border: 1px solid var(--tool-border); color: var(--tool-navy); background: white; }
.secondary-button:hover, .copy-button:hover, .state-action:hover { border-color: var(--tool-navy); background: var(--tool-blue-soft); }
.copy-button { min-height: 34px; padding: 0 11px; font-size: 12px; }

.step-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin: 0 0 16px; padding: 1px; border-radius: var(--tool-radius-control); background: var(--tool-border); overflow: hidden; }
.step { min-height: 44px; display: flex; align-items: center; justify-content: center; padding: 8px 10px; color: var(--tool-muted); background: var(--tool-surface); font-size: 12px; font-weight: 650; text-align: center; }
.step.active { color: var(--tool-navy); background: var(--tool-blue-soft); }
.step.done { color: var(--tool-success); background: var(--tool-teal-soft); }

.status-box {
  display: none;
  align-items: start;
  gap: 12px;
  margin-bottom: 16px;
  padding: 14px 15px;
  border-radius: var(--tool-radius-control);
  color: var(--tool-ink-soft);
  background: var(--tool-surface-muted);
}
.status-box.visible { display: flex; }
.status-box.error { color: var(--tool-error); background: var(--tool-error-soft); }
.status-box.warning { color: var(--tool-warning); background: var(--tool-warning-soft); }
.status-box.success { color: var(--tool-success); background: var(--tool-teal-soft); }
.status-icon { flex: 0 0 auto; width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; background: currentColor; color: white; font-size: 12px; font-weight: 800; }
.status-content { flex: 1; min-width: 0; }
.status-title { margin: 0; color: currentColor; font-size: 13px; font-weight: 800; }
.status-message { margin: 3px 0 0; color: var(--tool-ink-soft); font-size: 13px; line-height: 1.55; }
.status-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.state-action { min-height: 34px; padding: 0 11px; font-size: 12px; }

.loading-lines { display: grid; gap: 9px; padding: 4px 0; }
.loading-line { height: 11px; border-radius: 4px; background: var(--tool-surface-muted); animation: pulse 1.4s ease-in-out infinite; }
.loading-line:nth-child(2) { width: 86%; animation-delay: 120ms; }
.loading-line:nth-child(3) { width: 65%; animation-delay: 240ms; }
@keyframes pulse { 50% { opacity: .45; } }

.result-area { margin-top: 16px; }
.result-area[hidden] { display: none; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.result-panel:first-child { grid-column: 1 / -1; }
.output-wrap { position: relative; }
.output-box { min-height: 130px; padding: 16px; border-radius: var(--tool-radius-control); color: var(--tool-ink-soft); background: var(--tool-surface-muted); font-size: 13px; line-height: 1.75; white-space: pre-wrap; overflow-wrap: anywhere; }
.output-toolbar { display: flex; justify-content: flex-end; margin-bottom: 9px; }
.next-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.chat-layout { min-height: calc(100vh - 68px); display: flex; flex-direction: column; }
.chat-main { width: min(920px, calc(100% - 40px)); flex: 1; min-height: 0; margin: 0 auto; padding: 34px 0 0; display: flex; flex-direction: column; }
.chat-heading { padding-bottom: 20px; border-bottom: 1px solid var(--tool-border); }
.chat-heading h1 { margin: 0; color: var(--tool-navy); font-size: 26px; letter-spacing: -.02em; }
.chat-heading p { margin: 8px 0 0; color: var(--tool-ink-soft); font-size: 14px; line-height: 1.65; }
.suggestions { display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 0; }
.chat-messages { flex: 1; min-height: 240px; overflow-y: auto; padding: 14px 2px 24px; display: flex; flex-direction: column; gap: 18px; scroll-behavior: smooth; }
.message { max-width: min(88%, 720px); display: flex; align-items: start; gap: 10px; }
.message.user { align-self: flex-end; flex-direction: row-reverse; }
.message.assistant { align-self: flex-start; }
.avatar { width: 34px; height: 34px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 10px; color: white; background: var(--tool-navy); font-size: 12px; font-weight: 800; }
.message.assistant .avatar { background: var(--tool-teal); }
.message-content { padding: 12px 14px; border-radius: 12px; color: var(--tool-ink-soft); background: white; font-size: 14px; line-height: 1.72; overflow-wrap: anywhere; }
.message.user .message-content { color: var(--tool-navy); background: var(--tool-blue-soft); }
.message-content p { margin: 0 0 9px; }
.message-content p:last-child { margin-bottom: 0; }
.message-content code { padding: 2px 5px; border-radius: 4px; background: var(--tool-surface-muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }
.typing-dots { display: flex; align-items: center; gap: 5px; min-height: 24px; }
.typing-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--tool-teal); animation: typing 1.2s ease-in-out infinite; }
.typing-dot:nth-child(2) { animation-delay: 120ms; }
.typing-dot:nth-child(3) { animation-delay: 240ms; }
@keyframes typing { 50% { opacity: .35; transform: translateY(-2px); } }
.chat-composer-shell { position: sticky; bottom: 0; padding: 12px 0 18px; background: linear-gradient(to bottom, transparent, var(--tool-bg) 18%); }
.chat-status { margin-bottom: 8px; }
.composer { display: flex; align-items: end; gap: 10px; padding: 7px; border: 1px solid var(--tool-border); border-radius: 12px; background: white; }
.composer:focus-within { border-color: var(--tool-navy); box-shadow: 0 0 0 3px color-mix(in oklch, var(--tool-navy), transparent 82%); }
.composer textarea { min-height: 42px; max-height: 120px; padding: 10px 8px; border: 0; box-shadow: none; resize: none; background: transparent; }
.composer textarea:focus-visible { border: 0; box-shadow: none; }
.composer .primary-button { flex: 0 0 auto; }

.tool-footer { padding: 20px; border-top: 1px solid var(--tool-border); color: var(--tool-muted); font-size: 12px; text-align: center; }

:focus-visible { outline: 3px solid color-mix(in oklch, var(--tool-teal), transparent 55%); outline-offset: 2px; }

@media (max-width: 760px) {
  .tool-header-inner, .tool-main, .chat-main { width: min(100% - 28px, 1120px); }
  .tool-main { padding: 28px 0 44px; }
  .tool-intro { align-items: start; flex-direction: column; gap: 16px; }
  .tool-intro h1 { font-size: 28px; }
  .panel { padding: 20px; }
  .field-grid, .result-grid { grid-template-columns: 1fr; }
  .result-panel:first-child { grid-column: auto; }
  .step-list { grid-template-columns: 1fr 1fr; }
  .chat-main { padding-top: 24px; }
  .message { max-width: 94%; }
}

@media (max-width: 480px) {
  .tool-header-inner { min-height: 62px; }
  .tool-mark { width: 32px; height: 32px; }
  .tool-brand-name { font-size: 14px; }
  .tool-page-name { display: none; }
  .back-link { min-height: 36px; padding: 0 10px; }
  .panel { padding: 17px; }
  .step { min-height: 40px; font-size: 11px; }
  .composer { gap: 6px; }
  .composer .primary-button { min-width: 62px; padding: 0 12px; }
  .avatar { width: 30px; height: 30px; border-radius: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}