:root {
  color-scheme: light;
  --bg: #f3f2ee;
  --surface: #ffffff;
  --surface-soft: #fcfcfa;
  --ink: #1d2927;
  --muted: #65716c;
  --faint: #7f8b84;
  --line: #e3e5e0;
  --line-strong: #cbd2cc;
  --accent: #356e67;
  --accent-soft: #e4efeb;
  --danger: #a25249;
  --danger-soft: #f4e5e2;
  --font-ui: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-display: "STSong", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  font-family: var(--font-ui);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.5;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
}

::selection {
  color: #fff;
  background: var(--accent);
}

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

button,
textarea {
  font: inherit;
}

button {
  border: 0;
}

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

button:focus-visible,
a:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

[hidden] {
  display: none !important;
}

.site-container {
  width: min(1080px, calc(100% - 80px));
  margin-inline: auto;
}

main {
  padding: 56px 0 72px;
}

.workspace-head {
  padding-bottom: 12px;
  text-align: center;
}

.workspace-head h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 3.8vw, 44px);
  font-synthesis: weight;
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.07em;
}

.workspace-card,
.result-panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(253, 253, 250, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 40px rgba(28, 40, 40, 0.035);
}

.workspace-card {
  position: relative;
  padding: 28px 36px 24px;
}

.result-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 24px;
  font-synthesis: weight;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.06em;
}

.textarea-shell {
  margin-top: 12px;
  overflow: hidden;
  border: 1px solid #c3ccc5;
  border-radius: 14px;
  background: #f7f6f2;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 7px 22px rgba(31, 48, 43, 0.035);
  transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.textarea-shell:focus-within {
  border-color: #8daaa0;
  background: #faf9f6;
  box-shadow: 0 0 0 3px rgba(53, 110, 103, 0.07), 0 8px 22px rgba(31, 48, 43, 0.035);
}

.textarea-shell.is-busy {
  border-color: #7c9a96;
}

.textarea-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  min-height: 48px;
  padding: 12px 20px;
  color: var(--faint);
  border-top: 1px solid var(--line);
  background: var(--surface-soft);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0;
  text-transform: none;
}

.inline-status i {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
}

.inline-status[data-tone="busy"] i {
  background: var(--danger);
}

textarea {
  display: block;
  width: 100%;
  min-height: 276px;
  padding: 24px 24px 20px;
  resize: vertical;
  color: var(--ink);
  border: 0;
  outline: 0;
  background: transparent;
  caret-color: #89a79d;
  font-size: 18px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}

textarea::placeholder {
  color: var(--faint);
  opacity: 1;
  font-size: 16px;
}

textarea:focus-visible {
  outline: none;
}

textarea::selection {
  color: var(--ink);
  background: var(--accent-soft);
}

textarea:disabled {
  cursor: wait;
  opacity: 0.65;
}

/* merged into first .textarea-foot above */

.textarea-foot > span:first-child {
  color: var(--muted);
}

.textarea-foot > span:last-child {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.char-progress {
  height: 2px;
  background: var(--line);
}

.char-progress i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
  transition: width 180ms ease, background 180ms ease;
}

.char-progress.is-near-limit i {
  background: #a87a39;
}

.char-progress.is-over-limit i {
  background: var(--danger);
}

.input-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 16px;
}

.action-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.action-group-secondary {
  justify-content: flex-start;
}

.action-group-primary {
  justify-content: flex-end;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  cursor: pointer;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: transparent;
  font-size: 13px;
  font-weight: 520;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover:not(:disabled) {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--surface-soft);
}

.button-quiet {
  min-height: 40px;
}

.button-cancel {
  color: var(--danger);
  border-color: #dfbbb7;
  background: var(--danger-soft);
}

.button-primary {
  min-width: 124px;
  color: #fff;
  border-color: var(--ink);
  background: var(--ink);
}

.button-primary:hover:not(:disabled) {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.inline-status {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 24px;
  margin: 15px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.inline-status[data-tone="error"] i {
  background: var(--danger);
}

.inline-status[data-tone="success"] i {
  background: var(--accent);
}

.result-panel {
  margin-top: 24px;
  padding: 32px 40px 28px;
}

.result-panel.is-visible {
  animation: result-reveal 180ms ease-out both;
}

.result-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.result-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: 48px;
  padding: 32px 0 32px;
}

.score-block {
  padding-right: 48px;
  border-right: 1px solid var(--line);
}

.score-meter {
  margin-top: 0;
}

.score-meter-top {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 16px;
}

.score-meter-top span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.3;
}

.score-meter-top strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: clamp(68px, 7.5vw, 96px);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.08em;
}

.score-meter-track {
  height: 8px;
  margin-top: 24px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 99px;
  background: var(--surface-soft);
}

.score-meter-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 500ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.score-meter-axis {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  color: var(--faint);
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: none;
}

.result-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.result-title-row h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 30px);
  font-synthesis: weight;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.07em;
}

.risk-badge {
  flex: 0 0 auto;
  padding: 6px 12px;
  color: var(--accent);
  border: 1px solid #a9c9c3;
  border-radius: 99px;
  background: var(--accent-soft);
  font-size: 12px;
  line-height: 1;
}

.risk-badge.risk-uncertain {
  color: #936829;
  border-color: #dfc698;
  background: #f7eedf;
}

.risk-badge.risk-elevated,
.risk-badge.risk-ai {
  color: var(--danger);
  border-color: #dfbbb7;
  background: var(--danger-soft);
}

.result-description {
  max-width: 620px;
  margin: 16px 0 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.result-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin: 24px 0 0;
}

.result-meta > div {
  min-width: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.result-meta dt {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.result-meta dd {
  overflow: hidden;
  margin: 8px 0 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.score-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.score-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.score-row-top strong {
  color: var(--ink);
  font: 13px/1 var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.score-row-bar {
  height: 4px;
  overflow: hidden;
  border-radius: 99px;
  background: var(--line);
}

.score-row-bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 400ms ease;
}

.score-row:nth-child(2) .score-row-bar i {
  background: #a87a39;
}

.score-row:nth-child(3) .score-row-bar i {
  background: #7f908a;
}

.details-block {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.details-block summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  list-style: none;
}

.details-block summary::-webkit-details-marker {
  display: none;
}

.details-block summary span:last-child {
  color: var(--accent);
  font-size: 17px;
  transition: transform 160ms ease;
}

.details-block[open] summary span:last-child {
  transform: rotate(45deg);
}

.details-inner {
  display: grid;
  gap: 12px;
  padding-top: 15px;
}

.details-inner pre {
  max-height: 280px;
  margin: 0;
  overflow: auto;
  padding: 16px;
  color: #d8e1dd;
  border-radius: 8px;
  background: #253638;
  font: 11px/1.7 var(--font-mono);
}

.details-inner .button {
  justify-self: start;
}

.privacy-note {
  margin: 16px 0 0;
  padding-top: 13px;
  color: var(--faint);
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  padding: 0;
  margin: -1px;
  border: 0;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@keyframes result-reveal {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 700px) {
  .site-container {
    width: min(100% - 40px, 680px);
  }

  main {
    padding-top: 34px;
    padding-bottom: 56px;
  }

  .workspace-card,
  .result-panel {
    padding: 24px;
  }


  textarea {
    min-height: 252px;
  }

  .result-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .score-block {
    padding: 0 0 28px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .score-meter-top {
    align-items: baseline;
    flex-direction: row;
    justify-content: space-between;
    gap: 16px;
  }

  .score-meter-top strong {
    font-size: 72px;
  }

}

@media (max-width: 500px) {
  .site-container {
    width: min(100% - 24px, 480px);
  }

  .result-heading,
  .result-title-row {
    display: grid;
    align-items: start;
    gap: 11px;
  }


  .risk-badge {
    justify-self: start;
  }

  .textarea-foot {
    display: grid;
    gap: 6px;
    align-items: start;
  }

  .input-actions {
    display: grid;
    gap: 10px;
  }

  .action-group {
    width: 100%;
    justify-content: stretch;
  }

  .action-group .button {
    width: 100%;
  }

  .action-group-secondary .button {
    flex: 1 1 0;
  }

  .action-group-primary {
    display: flex;
  }

  .action-group-primary .button {
    flex: 0 0 auto;
  }

  .action-group-primary .button-primary {
    min-width: 0;
    flex: 1 1 auto;
  }

  .result-meta,
  .score-list {
    grid-template-columns: 1fr;
  }

  .result-meta {
    gap: 0;
  }

  .result-meta > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 15px;
    padding: 10px 0;
  }

  .result-meta dd {
    max-width: 65%;
    margin-top: 0;
    text-align: right;
  }

  .textarea-foot {
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.fact-tooltip-container {
  position: relative;
  cursor: help;
  display: inline-flex;
  align-items: center;
  margin-left: 4px;
}

.fact-tooltip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 8px;
  background: var(--ink);
  color: var(--surface);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.4;
  width: max-content;
  max-width: 280px;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
  pointer-events: none;
  z-index: 1000;
  font-weight: normal;
}

.fact-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: var(--ink) transparent transparent transparent;
}

.fact-tooltip-container:hover .fact-tooltip {
  opacity: 1;
  visibility: visible;
}

.result-facts div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}

.result-facts div:last-child {
  border-bottom: none;
}

.fact-label-group {
  display: inline-flex;
  align-items: center;
}

.help-icon {
  margin-left: 4px;
  color: var(--faint);
  transition: color 0.2s;
}

.fact-tooltip-container:hover .help-icon {
  color: var(--ink);
}


.top-island {
  position: sticky;
  top: 24px;
  z-index: 100;
  margin-bottom: 40px;
}
.top-island-inner {
  margin: 0 auto;
  max-width: 1188px;
  background: rgba(253, 253, 250, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 200px;
  padding: 20px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}
.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 40px;
  color: var(--ink);
}
.nav-links {
  display: flex;
  gap: 24px;
}
.nav-links a {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-decoration: none;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--ink);
}

/* ── Top bar responsive ── */

@media (max-width: 700px) {
  .top-island {
    top: 12px;
    margin-bottom: 24px;
  }

  .top-island-inner {
    padding: 16px 28px;
  }

  .brand {
    font-size: 28px;
  }

  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 16px;
  }
}

@media (max-width: 500px) {
  .top-island {
    top: 8px;
  }

  .top-island-inner {
    padding: 14px 20px;
  }

  .brand {
    font-size: 24px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    font-size: 14px;
    letter-spacing: 0.02em;
  }
}

/* ── Workspace: subtitle & model indicator ── */

.workspace-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.model-status-indicator {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 1;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--faint);
}

.model-status-indicator[data-tone="ready"] {
  background: var(--accent);
}

.model-status-indicator[data-tone="busy"] {
  background: #a87a39;
}

.model-status-indicator[data-tone="error"] {
  background: var(--danger);
}

/* ── Result page: heading actions ── */

.result-heading-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* ── Result page: loading ── */

.result-loading {
  padding: 32px 0;
}

.loading-grid {
  display: grid;
  gap: 24px;
}

.loading-progress-block {
  max-width: 480px;
}

.loading-progress-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.loading-sentence {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.loading-percent {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.loading-progress-track {
  height: 6px;
  overflow: hidden;
  border-radius: 99px;
  background: var(--line);
}

.loading-progress-track i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 300ms ease;
}

.loading-error {
  margin: 12px 0 0;
  color: var(--danger);
  font-size: 13px;
  line-height: 1.5;
}

.cancel-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.cancel-actions.is-hidden {
  display: none;
}

/* ── Result page: signal analysis ── */

.signal-analysis {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.analysis-heading {
  margin-bottom: 20px;
}

.analysis-heading h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.04em;
}

.analysis-main {
  position: relative;
}

.text-highlights {
  font-size: 16px;
  line-height: 2;
  color: var(--ink);
}

.text-highlights [role="listitem"] {
  display: inline;
  padding: 2px 0;
  border-radius: 3px;
  cursor: default;
  transition: background 160ms ease;
}

.text-highlights [role="listitem"]:hover {
  background: var(--accent-soft);
}

.signal-tooltip {
  position: absolute;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--surface);
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.signal-tooltip strong {
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

/* ── Result page: metrics grid ── */

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 16px;
}

.metric-card {
  padding: 16px 0;
}

.metric-card h4 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.metric-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--muted);
}

.metric-row strong {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

/* ── Mobile: result page additions ── */

@media (max-width: 700px) {
  .metrics-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .loading-progress-block {
    max-width: 100%;
  }

  .result-heading {
    flex-wrap: wrap;
  }
}

@media (max-width: 500px) {
  .signal-analysis {
    margin-top: 20px;
    padding-top: 20px;
  }

  .metrics-grid {
    gap: 12px;
  }
}