:root {
  --blue: #0f62fe;
  --blue-dark: #002d9c;
  --ink: #161616;
  --muted: #525252;
  --subtle: #8c8c8c;
  --canvas: #ffffff;
  --surface: #f4f4f4;
  --surface-strong: #e0e0e0;
  --border: #d8dce0;
  --success: #24a148;
  --warning: #f1c21b;
  --danger: #da1e28;
  --shadow: 0 12px 30px rgba(22, 22, 22, 0.08);
  --font: "IBM Plex Sans", "Inter", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
}

button,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 0 32px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 32px;
  color: #fff;
  background: var(--ink);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: 15px;
}

.brand div > span {
  color: var(--muted);
  font-size: 12px;
}

.top-actions {
  display: flex;
  gap: 18px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

.top-actions a:hover,
.top-actions a:focus-visible {
  color: var(--blue);
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
}

.language-toggle button {
  min-width: 44px;
  min-height: 30px;
  padding: 0 10px;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 12px;
}

.language-toggle button.is-active {
  color: #fff;
  background: var(--ink);
}

.page-shell {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  padding: 36px 0 64px;
}

.workspace {
  display: grid;
  gap: 24px;
}

.intro-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(260px, 0.55fr);
  gap: 32px;
  align-items: end;
  padding: 32px 0 20px;
  border-bottom: 1px solid var(--border);
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 840px;
  margin-bottom: 12px;
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: 0;
}

.intro-copy {
  max-width: 510px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.68fr);
  gap: 24px;
  align-items: start;
}

.input-panel,
.preview-panel,
.report-section,
.examples-section {
  background: var(--surface);
  border: 1px solid var(--border);
}

.input-panel,
.preview-panel {
  padding: 24px;
}

.panel-heading,
.report-toolbar {
  display: flex;
  gap: 16px;
  align-items: start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.panel-heading.compact {
  margin-bottom: 16px;
}

.panel-heading h2,
.report-toolbar h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 400;
  line-height: 1.25;
}

.system-badge,
.status-dot {
  flex: none;
  border: 1px solid var(--border);
  padding: 5px 8px;
  background: var(--canvas);
  color: var(--muted);
  font-size: 12px;
}

.status-dot {
  color: var(--blue-dark);
}

.field-group {
  display: grid;
  gap: 8px;
}

.field-group > span,
.style-field legend {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.field-group small {
  color: var(--muted);
  font-size: 12px;
}

textarea,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--border);
  border-bottom: 2px solid var(--ink);
  border-radius: 0;
  background: var(--canvas);
  color: var(--ink);
  outline: none;
}

textarea {
  resize: vertical;
  padding: 14px 16px;
}

select {
  padding: 0 14px;
}

textarea:focus,
select:focus {
  border-color: var(--blue);
  border-bottom-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(15, 98, 254, 0.13);
}

.advanced-panel {
  margin-top: 18px;
  border: 1px solid var(--border);
  background: #fbfcff;
}

.advanced-panel summary {
  cursor: pointer;
  padding: 12px 14px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  list-style-position: inside;
}

.advanced-panel > p {
  margin: -2px 14px 0;
  color: var(--muted);
  font-size: 12px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 14px 0;
}
.style-field {
  margin: 20px 0 0;
  padding: 0;
  border: 0;
}

.style-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  overflow: hidden;
  margin-top: 8px;
  border: 1px solid var(--border);
  background: var(--canvas);
}

.style-tabs label {
  position: relative;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 10px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
}

.style-tabs label:nth-child(3n) {
  border-right: 0;
}

.style-tabs label:nth-last-child(-n + 3) {
  border-bottom: 0;
}

.style-tabs input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.style-tabs label.is-selected {
  color: var(--ink);
  background: #eef4ff;
  box-shadow: inset 0 -3px 0 var(--blue);
  font-weight: 600;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 22px;
}

.button-row.small {
  margin-top: 0;
}

.primary-button,
.secondary-button,
.ghost-button {
  min-height: 44px;
  border-radius: 0;
  padding: 0 16px;
  font-size: 14px;
}

.primary-button {
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #fff;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.secondary-button {
  border: 1px solid var(--ink);
  background: var(--canvas);
  color: var(--ink);
}

.secondary-button:hover,
.secondary-button:focus-visible {
  border-color: var(--blue);
  color: var(--blue);
}

.ghost-button {
  min-height: 36px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
}

.ghost-button:hover,
.ghost-button:focus-visible {
  color: var(--blue);
  border-color: var(--blue);
}

.disclaimer {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.score-stack {
  display: grid;
  gap: 14px;
}

.score-hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 18px;
  background: var(--ink);
  color: #fff;
}

.score-hero span {
  color: #c6c6c6;
}

.score-hero strong {
  font-variant-numeric: tabular-nums;
  font-size: 48px;
  font-weight: 300;
  line-height: 1;
}

.mini-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.mini-metrics div {
  min-height: 78px;
  padding: 12px;
  background: var(--canvas);
}

.mini-metrics span,
.metric-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.mini-metrics strong {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
}

.process-box {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--border);
  background: var(--canvas);
}

.process-box h3 {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 500;
}

.process-box ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.share-card {
  margin-top: 18px;
  padding: 20px;
  border: 1px solid var(--ink);
  background:
    linear-gradient(90deg, var(--ink) 0 8px, transparent 8px),
    var(--canvas);
  box-shadow: var(--shadow);
}

.share-card-top,
.report-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

.share-card h3 {
  margin: 22px 0 12px;
  font-size: 24px;
  font-weight: 400;
}

.share-card p {
  color: var(--muted);
}

.share-score {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.share-score strong {
  color: var(--blue-dark);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  font-weight: 300;
}

.report-section,
.examples-section {
  margin-top: 24px;
  scroll-margin-top: 76px;
  padding: 24px;
}

.report-paper {
  min-height: 380px;
  border: 1px solid var(--border);
  background: var(--canvas);
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 360px;
  padding: 32px;
  color: var(--muted);
  text-align: center;
}

.empty-title {
  margin-bottom: 6px;
  color: var(--ink);
  font-size: 22px;
}

.report-inner {
  padding: 30px;
}

.report-cover {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.report-title h2 {
  margin: 10px 0 12px;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.15;
}

.report-index {
  display: grid;
  place-items: center;
  min-width: 148px;
  min-height: 148px;
  border: 1px solid var(--ink);
  text-align: center;
}

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

.report-index strong {
  color: var(--blue-dark);
  font-variant-numeric: tabular-nums;
  font-size: 38px;
  font-weight: 300;
}

.flavor-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0 8px;
}

.flavor-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: #f7f9fc;
  padding: 6px 8px;
  font-size: 12px;
}

.flavor-chip strong {
  font-weight: 600;
}

.flavor-chip em {
  color: var(--blue-dark);
  font-style: normal;
}
.report-block {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.report-block:last-child {
  border-bottom: 0;
}

.report-block h3 {
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 500;
}

.report-block p {
  margin-bottom: 0;
  color: var(--muted);
}


.report-highlight {
  padding: 0 2px;
  border-radius: 2px;
  color: #9f1d1d;
  background: #fff1a8;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.report-highlight.is-medium {
  color: #7f1d1d;
  background: #fff4c7;
  font-weight: 650;
}

.report-highlight.is-subtle {
  color: #8a3b12;
  background: #fff7df;
  font-weight: 600;
  text-decoration-thickness: 1px;
}
.output-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.output-item {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--border);
  background: #fafafa;
}

.output-item-header {
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.output-item-header span {
  color: var(--blue-dark);
  font-weight: 600;
}

.output-item-header strong {
  font-weight: 500;
}

.output-item p {
  margin: 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
}

.metric-card {
  padding: 14px;
  background: var(--canvas);
}

.metric-value {
  display: block;
  margin: 6px 0 10px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 300;
}

.bar-track {
  height: 6px;
  background: var(--surface-strong);
}

.bar-fill {
  height: 100%;
  background: var(--blue);
}

.risk-box {
  padding: 16px;
  border-left: 4px solid var(--warning);
  background: #fffdf2;
  color: var(--muted);
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.example-card {
  border: 1px solid var(--border);
  background: var(--canvas);
  padding: 16px;
  text-align: left;
}

.example-card strong {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.example-card p {
  min-height: 64px;
  margin-bottom: 12px;
  color: var(--muted);
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 50;
  max-width: min(360px, calc(100vw - 48px));
  padding: 12px 14px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 160ms ease, transform 160ms ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .topbar {
    padding: 0 18px;
  }

  .top-actions a {
    display: none;
  }

  .page-shell {
    width: min(100% - 28px, 760px);
    padding-top: 18px;
  }

  .intro-panel,
  .tool-grid,
  .report-cover {
    grid-template-columns: 1fr;
  }

  .report-index {
    width: 100%;
    min-height: 112px;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 14px;
  }

  .brand div > span,
  .ghost-button {
    display: none;
  }

  .intro-panel {
    padding-top: 14px;
  }

  h1 {
    font-size: 34px;
  }

  .input-panel,
  .preview-panel,
  .report-section,
  .examples-section,
  .report-inner {
    padding: 16px;
  }

  .form-row,
  .mini-metrics,
  .metrics-grid,
  .example-grid {
    grid-template-columns: 1fr;
  }

  .style-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .style-tabs label:nth-child(3n) {
    border-right: 1px solid var(--border);
  }

  .style-tabs label:nth-child(2n) {
    border-right: 0;
  }

  .style-tabs label:nth-last-child(-n + 3) {
    border-bottom: 1px solid var(--border);
  }

  .style-tabs label:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .report-toolbar,
  .panel-heading {
    display: grid;
  }

  .button-row.small {
    width: 100%;
  }

  .button-row.small button,
  .button-row button {
    flex: 1 1 180px;
  }
}