:root {
  color-scheme: light;
  --color-page: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-soft: #eef3f8;
  --color-ink: #172033;
  --color-muted: #5c6878;
  --color-subtle: #7b8796;
  --color-line: #d9e0e8;
  --color-line-strong: #bdc8d5;
  --color-primary: #0b6bcb;
  --color-primary-strong: #0758aa;
  --color-primary-soft: #e8f3ff;
  --color-navy: #101d31;
  --color-success: #18794e;
  --color-success-soft: #e7f6ee;
  --color-warning: #8a5800;
  --color-warning-soft: #fff3d6;
  --color-danger: #b42318;
  --color-danger-soft: #fff0ee;
  --shadow-sm: 0 1px 2px rgba(16, 29, 49, 0.06);
  --shadow-md: 0 14px 34px rgba(16, 29, 49, 0.09);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --container: 1200px;
  --section-space: 96px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--color-ink);
  background: var(--color-page);
  font-family:
    "Segoe UI Variable",
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    Arial,
    sans-serif;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

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

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

button {
  color: inherit;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid #76b9fa;
  outline-offset: 3px;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin-inline: auto;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: #fff;
  background: var(--color-navy);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(217, 224, 232, 0.88);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--color-ink);
  text-decoration: none;
}

.brand img {
  flex: 0 0 auto;
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-copy strong {
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.brand-copy span {
  color: var(--color-muted);
  font-size: 0.75rem;
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.primary-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.primary-nav a:hover {
  color: var(--color-primary);
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.button svg,
.send-button svg,
.compare-submit svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button:hover:not(:disabled),
.send-button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button-small {
  min-height: 42px;
  padding: 9px 16px;
  color: #fff;
  background: var(--color-primary);
  font-size: 0.9rem;
}

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

.button-primary:hover:not(:disabled),
.button-small:hover {
  background: var(--color-primary-strong);
  border-color: var(--color-primary-strong);
}

.button-secondary {
  color: var(--color-ink);
  background: var(--color-surface);
  border-color: var(--color-line-strong);
}

.button-secondary:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.button:disabled,
.send-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 76px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -180px;
  width: 420px;
  height: 420px;
  border: 72px solid var(--color-primary-soft);
  border-radius: 50%;
  opacity: 0.7;
  pointer-events: none;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
  gap: 72px;
  align-items: center;
}

.section-label {
  margin: 0 0 12px;
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-label-light {
  color: #9bd6ff;
}

.hero h1,
.section-intro h2,
.method-layout h2 {
  margin: 0;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(2.65rem, 5.3vw, 4.7rem);
}

.hero-lede {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--color-muted);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.75;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-examples {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  color: var(--color-subtle);
  font-size: 0.86rem;
}

.text-prompt {
  min-height: 44px;
  padding: 7px 0;
  color: var(--color-primary);
  background: transparent;
  border: 0;
  border-bottom: 1px solid #a9cff2;
  cursor: pointer;
}

.text-prompt:hover {
  color: var(--color-primary-strong);
  border-color: var(--color-primary-strong);
}

.trust-list {
  margin: 32px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
  color: var(--color-muted);
  font-size: 0.88rem;
}

.trust-list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.trust-list li::before {
  content: "✓";
  width: 20px;
  height: 20px;
  display: inline-grid;
  place-items: center;
  color: var(--color-success);
  background: var(--color-success-soft);
  border-radius: 50%;
  font-size: 0.72rem;
  font-weight: 900;
}

.coverage-panel {
  position: relative;
  padding: 30px;
  overflow: hidden;
  color: #fff;
  background: var(--color-navy);
  border: 1px solid #20314d;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.coverage-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image:
    linear-gradient(#fff 1px, transparent 1px),
    linear-gradient(90deg, #fff 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}

.coverage-panel > * {
  position: relative;
  z-index: 1;
}

.coverage-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.coverage-heading h2 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.coverage-pulse {
  width: 12px;
  height: 12px;
  margin-top: 8px;
  flex: 0 0 auto;
  background: #67e0a3;
  border: 3px solid rgba(103, 224, 163, 0.25);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(103, 224, 163, 0.12);
}

.coverage-stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  border-left: 1px solid rgba(255, 255, 255, 0.16);
}

.coverage-stat,
.stat-placeholder {
  min-height: 96px;
  padding: 17px;
  display: grid;
  align-content: center;
  gap: 3px;
  border-right: 1px solid rgba(255, 255, 255, 0.16);
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.stat-placeholder {
  grid-column: 1 / -1;
  color: #c1cede;
}

.coverage-stat strong {
  font-size: 1.45rem;
}

.coverage-stat span {
  color: #b9c7d8;
  font-size: 0.78rem;
}

.source-notice {
  margin-top: 20px;
  padding: 13px 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #d7e2ef;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  line-height: 1.55;
}

.source-notice::before {
  content: "i";
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  color: #0d3156;
  background: #9bd6ff;
  border-radius: 50%;
  font-family: Georgia, serif;
  font-weight: 800;
}

.coverage-footnote {
  margin: 14px 0 0;
  color: #91a3b8;
  font-size: 0.76rem;
}

.section {
  padding: var(--section-space) 0;
}

.section-soft {
  background: var(--color-surface-soft);
  border-bottom: 1px solid var(--color-line);
}

.section-intro {
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.7fr);
  gap: 56px;
  align-items: end;
}

.section-intro h2,
.method-layout h2 {
  font-size: clamp(2rem, 3.8vw, 3.15rem);
}

.section-intro > p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.75;
}

.agent-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.65fr);
  gap: 24px;
  align-items: start;
}

.chat-panel,
.agent-explainer,
.compare-card,
.results-workspace {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.chat-panel {
  overflow: hidden;
}

.chat-toolbar {
  min-height: 72px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--color-line);
}

.chat-identity {
  display: flex;
  align-items: center;
  gap: 11px;
}

.chat-identity > div {
  display: grid;
  gap: 2px;
}

.assistant-avatar,
.message-avatar {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  background: var(--color-primary);
  font-weight: 800;
}

.assistant-avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 0.75rem;
}

.agent-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-muted);
  font-size: 0.78rem;
}

.agent-status::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--color-subtle);
  border-radius: 50%;
}

.agent-status.ready::before {
  background: var(--color-success);
}

.agent-status.not-configured::before,
.agent-status.failed::before {
  background: var(--color-warning);
}

.icon-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--color-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.icon-button:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.icon-button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chat-log {
  min-height: 350px;
  max-height: 520px;
  padding: 24px 20px;
  display: grid;
  align-content: start;
  gap: 20px;
  overflow-y: auto;
  background: #fbfcfd;
}

.chat-message {
  display: flex;
  gap: 11px;
  align-items: flex-start;
}

.user-message {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  font-size: 0.68rem;
}

.user-message .message-avatar {
  color: #fff;
  background: var(--color-navy);
}

.message-body {
  max-width: min(660px, calc(100% - 44px));
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 4px 16px 16px;
  box-shadow: var(--shadow-sm);
}

.user-message .message-body {
  color: #fff;
  background: var(--color-navy);
  border-color: var(--color-navy);
  border-radius: 16px 4px 16px 16px;
}

.error-message .message-body {
  background: var(--color-danger-soft);
  border-color: #f2b8b2;
}

.message-meta {
  margin-bottom: 7px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-subtle);
  font-size: 0.72rem;
}

.message-meta strong {
  color: var(--color-ink);
  font-size: 0.78rem;
}

.user-message .message-meta,
.user-message .message-meta strong {
  color: #cdd8e6;
}

.message-body p {
  margin: 0;
  line-height: 1.7;
  white-space: pre-line;
}

.message-facts {
  margin: 12px 0 0;
  padding: 11px 0 0;
  display: grid;
  gap: 7px;
  border-top: 1px solid var(--color-line);
  list-style: none;
  color: var(--color-muted);
  font-size: 0.78rem;
}

.message-facts li {
  display: flex;
  gap: 7px;
}

.message-facts li::before {
  content: "•";
  color: var(--color-primary);
  font-weight: 900;
}

.message-action {
  min-height: 44px;
  margin-top: 12px;
  padding: 8px 12px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border: 1px solid #b9dcfa;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
}

.prompt-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.prompt-grid button {
  min-height: 76px;
  padding: 10px;
  display: grid;
  align-content: center;
  gap: 3px;
  text-align: left;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.prompt-grid button:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-color: #a8d2f7;
}

.prompt-grid strong {
  font-size: 0.78rem;
}

.prompt-grid span {
  color: var(--color-muted);
  font-size: 0.7rem;
}

.inline-alert,
.tool-activity {
  margin: 14px 18px 0;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
}

.inline-alert {
  display: grid;
  gap: 2px;
  color: var(--color-warning);
  background: var(--color-warning-soft);
  border: 1px solid #ead095;
}

.tool-activity {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--color-primary-strong);
  background: var(--color-primary-soft);
  border: 1px solid #b9dcfa;
}

.tool-activity.complete {
  color: var(--color-success);
  background: var(--color-success-soft);
  border-color: #a9dfc2;
}

.tool-activity.failed {
  color: var(--color-danger);
  background: var(--color-danger-soft);
  border-color: #f2b8b2;
}

.activity-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid #9cccf5;
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.tool-activity.complete .activity-spinner,
.tool-activity.failed .activity-spinner {
  animation: none;
  border: 0;
}

.tool-activity.complete .activity-spinner {
  background: var(--color-success);
}

.tool-activity.failed .activity-spinner {
  background: var(--color-danger);
}

.composer {
  margin: 14px 18px 0;
  padding: 8px;
  display: flex;
  gap: 8px;
  align-items: flex-end;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
}

.composer:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.composer textarea {
  width: 100%;
  min-height: 52px;
  max-height: 180px;
  padding: 10px;
  resize: vertical;
  color: var(--color-ink);
  background: transparent;
  border: 0;
  outline: 0;
  line-height: 1.55;
}

.send-button {
  min-width: 92px;
  min-height: 46px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  color: #fff;
  background: var(--color-primary);
  border: 0;
  border-radius: var(--radius-sm);
  font-weight: 700;
  cursor: pointer;
}

.composer-note {
  margin: 8px 20px 17px;
  color: var(--color-subtle);
  font-size: 0.72rem;
}

.agent-explainer {
  padding: 28px;
}

.agent-explainer h3 {
  margin: 0;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.process-list {
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
  list-style: none;
}

.process-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
}

.process-list li > span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 800;
}

.process-list strong {
  font-size: 0.9rem;
}

.process-list p {
  margin: 5px 0 0;
  color: var(--color-muted);
  font-size: 0.82rem;
  line-height: 1.65;
}

.compare-layout {
  display: grid;
  grid-template-columns: minmax(340px, 0.72fr) minmax(0, 1.28fr);
  gap: 24px;
  align-items: start;
}

.compare-card,
.results-workspace {
  padding: 28px;
}

.form-steps {
  margin: 0 0 30px;
  padding: 0 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  border-bottom: 1px solid var(--color-line);
  list-style: none;
  color: var(--color-subtle);
  font-size: 0.74rem;
}

.form-steps li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.form-steps span {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  background: var(--color-surface-soft);
  border-radius: 50%;
  font-weight: 800;
}

.form-steps .active {
  color: var(--color-primary);
  font-weight: 700;
}

.form-steps .active span {
  color: #fff;
  background: var(--color-primary);
}

.form-section {
  margin: 0;
  padding: 0;
  border: 0;
}

.form-section + .form-section {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.form-section legend {
  width: 100%;
  margin-bottom: 16px;
  display: grid;
  gap: 3px;
  font-size: 1.05rem;
  font-weight: 750;
}

.step-kicker {
  color: var(--color-primary);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.workload-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.workload-option {
  position: relative;
}

.workload-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.workload-option label {
  min-height: 78px;
  padding: 13px;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.workload-option input:focus-visible + label {
  outline: 3px solid #76b9fa;
  outline-offset: 2px;
}

.workload-option input:checked + label {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  box-shadow: inset 0 0 0 1px var(--color-primary);
}

.workload-glyph {
  width: 34px;
  height: 34px;
  position: relative;
  display: block;
  background: var(--color-surface-soft);
  border-radius: 10px;
}

.workload-glyph::before,
.workload-glyph::after {
  content: "";
  position: absolute;
  border: 2px solid var(--color-primary);
}

.workload-glyph::before {
  inset: 9px 7px;
  border-radius: 3px;
}

.workload-glyph::after {
  width: 8px;
  height: 2px;
  right: 9px;
  bottom: 7px;
  border-width: 2px 0 0;
}

.workload-option strong,
.workload-option small {
  display: block;
}

.workload-option strong {
  font-size: 0.83rem;
  line-height: 1.35;
}

.workload-option small {
  margin-top: 3px;
  color: var(--color-muted);
  font-size: 0.67rem;
}

.field-help {
  min-height: 20px;
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 0.78rem;
}

.field-row,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.resource-grid {
  margin-top: 14px;
}

.field {
  min-width: 0;
  display: grid;
  gap: 7px;
}

.field > span:first-child {
  color: var(--color-ink);
  font-size: 0.82rem;
  font-weight: 700;
}

.field select,
.field input {
  width: 100%;
  min-height: 46px;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
}

.field select {
  padding: 10px 36px 10px 12px;
}

.field input {
  min-width: 0;
  padding: 10px 50px 10px 12px;
  border: 0;
  outline: 0;
}

.field small {
  min-height: 18px;
  color: var(--color-subtle);
  font-size: 0.7rem;
  line-height: 1.4;
}

.field small[data-field-error] {
  visibility: hidden;
  color: var(--color-danger);
}

.field.invalid small[data-field-error] {
  visibility: visible;
}

.field.invalid .input-with-unit {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 2px var(--color-danger-soft);
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
}

.input-with-unit:focus-within,
.field select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
  outline: 0;
}

.input-with-unit > span:last-child {
  position: absolute;
  right: 12px;
  color: var(--color-subtle);
  font-size: 0.76rem;
  pointer-events: none;
}

.advanced-options {
  margin-top: 24px;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.advanced-options summary {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  list-style: none;
}

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

.advanced-options summary span {
  display: grid;
  gap: 2px;
}

.advanced-options summary strong {
  font-size: 0.86rem;
}

.advanced-options summary small {
  color: var(--color-subtle);
  font-size: 0.7rem;
}

.advanced-options summary svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: var(--color-muted);
  stroke-width: 1.8;
  transition: transform 160ms ease;
}

.advanced-options[open] summary svg {
  transform: rotate(180deg);
}

.advanced-content {
  padding: 0 0 20px;
  display: grid;
  gap: 14px;
}

.form-error {
  margin-top: 16px;
  padding: 10px 12px;
  color: var(--color-danger);
  background: var(--color-danger-soft);
  border: 1px solid #f2b8b2;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.compare-submit {
  width: 100%;
  margin-top: 20px;
}

.results-workspace {
  min-height: 580px;
}

.results-toolbar {
  min-height: 56px;
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.results-toolbar .section-label {
  margin-bottom: 4px;
}

.results-toolbar h3 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.result-summary {
  max-width: 270px;
  color: var(--color-muted);
  font-size: 0.78rem;
  line-height: 1.5;
  text-align: right;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.supplier-card {
  min-width: 0;
  padding: 20px;
  display: grid;
  align-content: start;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.supplier-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.supplier-heading h4 {
  margin: 0;
  font-size: 1.05rem;
}

.supplier-sku {
  margin: 4px 0 0;
  color: var(--color-muted);
  font-size: 0.76rem;
  overflow-wrap: anywhere;
}

.status-badge {
  min-height: 28px;
  padding: 4px 8px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex: 0 0 auto;
  border-radius: 999px;
  font-size: 0.67rem;
  font-weight: 750;
}

.status-badge::before {
  width: 15px;
  height: 15px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 0.58rem;
  font-weight: 900;
}

.status-live {
  color: var(--color-success);
  background: var(--color-success-soft);
}

.status-live::before {
  content: "✓";
  color: #fff;
  background: var(--color-success);
}

.status-seed {
  color: #735500;
  background: #fff7da;
}

.status-seed::before {
  content: "i";
  color: #fff;
  background: #9a7200;
}

.status-stale {
  color: var(--color-warning);
  background: var(--color-warning-soft);
}

.status-stale::before {
  content: "!";
  color: #fff;
  background: var(--color-warning);
}

.status-unavailable {
  color: var(--color-muted);
  background: var(--color-surface-soft);
}

.status-unavailable::before {
  content: "—";
  color: #fff;
  background: var(--color-subtle);
}

.monthly-estimate {
  margin-top: 22px;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.monthly-estimate strong {
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  letter-spacing: -0.035em;
}

.monthly-estimate span {
  color: var(--color-muted);
  font-size: 0.76rem;
}

.supplier-highlights {
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.supplier-highlights li {
  padding: 5px 8px;
  color: var(--color-muted);
  background: var(--color-surface-soft);
  border-radius: 6px;
  font-size: 0.68rem;
}

.supplier-details {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
}

.supplier-details summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  color: var(--color-primary);
  font-size: 0.76rem;
  font-weight: 700;
  cursor: pointer;
}

.detail-list {
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  list-style: none;
  color: var(--color-muted);
  font-size: 0.72rem;
}

.detail-list li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 8px;
}

.detail-list strong {
  color: var(--color-ink);
}

.detail-list a {
  color: var(--color-primary);
  overflow-wrap: anywhere;
}

.assumptions-panel {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.assumptions-panel summary {
  min-height: 44px;
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.assumptions-panel ul {
  margin: 8px 0 0;
  padding-left: 20px;
  color: var(--color-muted);
  font-size: 0.76rem;
  line-height: 1.7;
}

.result-state {
  grid-column: 1 / -1;
  min-height: 300px;
  padding: 38px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  text-align: center;
  color: var(--color-muted);
  background: #fbfcfd;
  border: 1px dashed var(--color-line-strong);
  border-radius: var(--radius-md);
}

.result-state-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 14px;
  font-weight: 850;
}

.result-state h4,
.result-state p {
  margin: 0;
}

.result-state h4 {
  color: var(--color-ink);
}

.result-state p {
  max-width: 420px;
  font-size: 0.82rem;
  line-height: 1.65;
}

.result-state button {
  min-height: 44px;
  padding: 9px 14px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border: 1px solid #b9dcfa;
  border-radius: var(--radius-sm);
  font-weight: 700;
  cursor: pointer;
}

.skeleton-card {
  min-height: 250px;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.skeleton-line {
  height: 12px;
  margin-bottom: 12px;
  background: #e7ecf2;
  border-radius: 999px;
  animation: pulse 1.2s ease-in-out infinite alternate;
}

.skeleton-line.short {
  width: 44%;
}

.skeleton-line.medium {
  width: 68%;
}

.skeleton-price {
  width: 58%;
  height: 30px;
  margin: 38px 0 26px;
  background: #dce4ec;
  border-radius: 8px;
  animation: pulse 1.2s ease-in-out infinite alternate;
}

.section-dark {
  color: #fff;
  background: var(--color-navy);
}

.method-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.7fr) minmax(0, 1.3fr);
  gap: 72px;
}

.method-layout h2 {
  max-width: 460px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.method-grid article {
  padding-top: 18px;
  border-top: 1px solid #3a4b65;
}

.method-grid article > span {
  color: #9bd6ff;
  font-size: 0.76rem;
  font-weight: 800;
}

.method-grid h3 {
  margin: 18px 0 8px;
  font-size: 1rem;
}

.method-grid p {
  margin: 0;
  color: #afbdce;
  font-size: 0.82rem;
  line-height: 1.7;
}

.site-footer {
  padding: 28px 0;
  background: #0b1525;
  border-top: 1px solid #26364f;
}

.footer-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-brand,
.footer-brand .brand-copy strong {
  color: #fff;
}

.footer-brand .brand-copy span,
.footer-layout > p {
  color: #8fa0b5;
}

.footer-layout > p {
  margin: 0;
  font-size: 0.78rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  from {
    opacity: 0.55;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 1020px) {
  :root {
    --section-space: 80px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .coverage-panel {
    max-width: 720px;
  }

  .agent-layout,
  .compare-layout,
  .method-layout {
    grid-template-columns: 1fr;
  }

  .agent-explainer {
    display: none;
  }

  .method-grid {
    gap: 20px;
  }
}

@media (max-width: 760px) {
  :root {
    --section-space: 64px;
  }

  .container {
    width: min(100% - 28px, var(--container));
  }

  .nav-shell {
    min-height: 64px;
    gap: 12px;
  }

  .brand-copy span,
  .primary-nav {
    display: none;
  }

  .nav-shell .button-small {
    margin-left: auto;
  }

  .hero {
    padding: 64px 0 56px;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 11vw, 3.7rem);
  }

  .section-intro {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .prompt-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .compare-card,
  .results-workspace {
    padding: 22px;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .result-summary {
    text-align: left;
  }

  .footer-layout {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 20px, var(--container));
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .brand-copy strong {
    font-size: 0.86rem;
  }

  .button-small {
    min-height: 44px;
    padding: 8px 12px;
  }

  .hero {
    padding-top: 48px;
  }

  .hero-actions {
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-examples {
    align-items: flex-start;
    flex-direction: column;
  }

  .trust-list {
    gap: 10px 16px;
  }

  .coverage-panel {
    padding: 22px;
  }

  .coverage-stats {
    grid-template-columns: 1fr;
  }

  .stat-placeholder {
    grid-column: auto;
  }

  .section-intro h2,
  .method-layout h2 {
    font-size: 2rem;
  }

  .chat-toolbar,
  .chat-log {
    padding-inline: 14px;
  }

  .chat-log {
    min-height: 320px;
    max-height: 500px;
  }

  .message-body {
    max-width: calc(100% - 38px);
    padding: 12px;
  }

  .composer {
    margin-inline: 12px;
    flex-direction: column;
    align-items: stretch;
  }

  .send-button {
    width: 100%;
  }

  .composer-note {
    margin-inline: 14px;
  }

  .compare-card,
  .results-workspace {
    padding: 18px;
    border-radius: var(--radius-md);
  }

  .form-steps {
    font-size: 0.66rem;
  }

  .form-steps li {
    align-items: flex-start;
    flex-direction: column;
  }

  .workload-options,
  .field-row,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .results-toolbar {
    flex-direction: column;
  }

  .supplier-heading {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}