:root {
  color-scheme: light;
  --bg: #f3f4f1;
  --bg-soft: #ecefed;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-strong: #ffffff;
  --surface: #f7f8f6;
  --surface-strong: #f1f3f1;
  --line: rgba(27, 36, 50, 0.12);
  --line-strong: rgba(27, 36, 50, 0.2);
  --text: #1a2230;
  --muted: #617082;
  --muted-strong: #495668;
  --accent: #4d647f;
  --accent-strong: #30465e;
  --accent-soft: rgba(77, 100, 127, 0.12);
  --success-soft: rgba(87, 114, 97, 0.1);
  --success-text: #355243;
  --danger-soft: rgba(159, 82, 77, 0.1);
  --danger-text: #7b3730;
  --shadow-sm: 0 12px 30px rgba(25, 34, 48, 0.04);
  --shadow-md: 0 24px 60px rgba(25, 34, 48, 0.06);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Instrument Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.44), transparent 20%),
    linear-gradient(180deg, #f8f8f6 0%, var(--bg) 100%);
}

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

button {
  appearance: none;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1440px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 32px;
}

.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(48, 70, 94, 0.14);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand-name,
.brand-copy,
.header-note {
  margin: 0;
}

.brand-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-copy,
.header-note {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(360px, 440px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.composer,
.preview-panel {
  border: 1px solid rgba(255, 255, 255, 0.64);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.composer {
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 40px);
  overflow: auto;
}

.composer::-webkit-scrollbar,
#preview-surface::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.composer::-webkit-scrollbar-thumb,
#preview-surface::-webkit-scrollbar-thumb {
  background: rgba(73, 86, 104, 0.16);
  border-radius: 999px;
}

.composer-intro,
.form,
.preview-header,
.preview-frame,
.preview-footnote {
  padding-left: 30px;
  padding-right: 30px;
}

.composer-intro {
  padding-top: 30px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(27, 36, 50, 0.08);
}

.eyebrow,
.section-step,
.source-card-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.composer-intro h1,
.preview-header h2 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.04em;
}

.composer-intro h1 {
  max-width: 14ch;
  font-size: clamp(2rem, 3vw, 2.75rem);
  line-height: 1.02;
}

.preview-header h2 {
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.08;
}

.intro-copy,
.section-copy,
.field-helper,
.helper-note,
.preview-context,
.preview-footnote {
  color: var(--muted);
  line-height: 1.65;
}

.intro-copy {
  max-width: 48ch;
  margin: 14px 0 0;
  font-size: 0.98rem;
}

.form {
  display: grid;
  gap: 18px;
  padding-top: 24px;
  padding-bottom: 30px;
}

.form-group,
.action-row {
  display: grid;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(27, 36, 50, 0.08);
}

.form-group-compact {
  gap: 14px;
}

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

.group-head h2,
.action-copy h2 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.section-copy {
  margin: 0;
  font-size: 0.92rem;
}

.group-head-split {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 16px;
}

.source-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.source-card {
  display: grid;
  gap: 7px;
  padding: 16px;
  border: 1px solid rgba(27, 36, 50, 0.1);
  border-radius: var(--radius-md);
  background: rgba(247, 248, 246, 0.85);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.source-card strong {
  font-size: 0.97rem;
  font-weight: 600;
  line-height: 1.35;
}

.source-card span:last-child {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.source-card:hover {
  transform: translateY(-1px);
  border-color: rgba(77, 100, 127, 0.22);
}

.source-card:focus-visible {
  outline: none;
  border-color: rgba(77, 100, 127, 0.34);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.source-card[data-state="active"],
.source-card[data-state="recommended"] {
  border-color: rgba(77, 100, 127, 0.28);
  background: rgba(255, 255, 255, 0.98);
}

.source-card[data-state="active"] strong,
.source-card[data-state="recommended"] strong {
  color: var(--accent-strong);
}

.source-card[data-state="secondary"] {
  border-color: rgba(77, 100, 127, 0.16);
  background: rgba(250, 250, 249, 0.96);
}

.helper-note {
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

.field {
  display: grid;
  gap: 9px;
}

.field-label {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid rgba(27, 36, 50, 0.1);
  border-radius: 16px;
  padding: 14px 15px;
  background: var(--surface);
  color: var(--text);
  line-height: 1.55;
  transition:
    border-color 140ms ease,
    box-shadow 140ms ease,
    background 140ms ease;
}

.field input::placeholder,
.field textarea::placeholder {
  color: #8a96a5;
}

.field input:hover,
.field textarea:hover,
.field select:hover {
  border-color: rgba(77, 100, 127, 0.22);
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: rgba(77, 100, 127, 0.34);
  background: var(--panel-strong);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.field-textarea textarea {
  min-height: 320px;
  padding: 16px;
  resize: vertical;
}

.field-helper {
  margin: 0;
  font-size: 0.88rem;
}

.metric-cluster {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.metric-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(27, 36, 50, 0.08);
  border-radius: 999px;
  background: rgba(247, 248, 246, 0.92);
  color: var(--muted-strong);
  font-size: 0.8rem;
  font-weight: 600;
}

.format-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(110px, 1fr));
  gap: 6px;
  padding: 4px;
  border: 1px solid rgba(27, 36, 50, 0.1);
  border-radius: 14px;
  background: var(--surface);
}

.format-pill {
  min-height: 40px;
  padding: 0 16px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted-strong);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 140ms ease,
    color 140ms ease,
    box-shadow 140ms ease;
}

.format-pill:hover {
  color: var(--text);
}

.format-pill.is-active {
  background: var(--panel-strong);
  color: var(--accent-strong);
  box-shadow: 0 1px 3px rgba(25, 34, 48, 0.08);
}

.format-pill:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.action-row {
  gap: 18px;
  border-bottom: 0;
  padding-bottom: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: var(--accent-strong);
  color: #f7f9fb;
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition:
    opacity 140ms ease,
    transform 140ms ease,
    background 140ms ease,
    border-color 140ms ease;
}

.actions button:hover:enabled {
  transform: translateY(-1px);
  background: #27394d;
}

.actions button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.actions button:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

#generate-button {
  flex: 1 1 100%;
  min-height: 52px;
}

.actions button.secondary {
  background: var(--surface);
  color: var(--accent-strong);
  border-color: rgba(77, 100, 127, 0.16);
}

.actions button.secondary:hover:enabled {
  background: var(--panel-strong);
}

.feedback-stack {
  display: grid;
  gap: 10px;
}

.status,
.error {
  margin: 0;
  padding: 13px 14px;
  border-radius: 14px;
  font-size: 0.9rem;
  line-height: 1.55;
}

.status {
  border: 1px solid rgba(87, 114, 97, 0.16);
  background: var(--success-soft);
  color: var(--success-text);
}

.error {
  border: 1px solid rgba(159, 82, 77, 0.16);
  background: var(--danger-soft);
  color: var(--danger-text);
}

.status:empty,
.error:empty {
  display: none;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 40px);
}

.preview-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 24px;
  padding-top: 30px;
  padding-bottom: 22px;
}

.preview-context {
  max-width: 54ch;
  margin: 12px 0 0;
  font-size: 0.98rem;
}

.preview-badges,
.preview-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.preview-badge,
.preview-state-chip,
.loading-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.81rem;
  font-weight: 600;
}

.preview-badge {
  border: 1px solid rgba(27, 36, 50, 0.08);
  background: rgba(247, 248, 246, 0.92);
  color: var(--muted-strong);
}

.preview-badge-muted,
.preview-state-chip {
  border: 1px solid rgba(77, 100, 127, 0.14);
  background: rgba(77, 100, 127, 0.08);
  color: var(--accent-strong);
}

.preview-frame {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  padding-bottom: 20px;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  border: 1px solid rgba(27, 36, 50, 0.08);
  border-bottom: 0;
  border-radius: 20px 20px 0 0;
  background: rgba(247, 248, 246, 0.88);
}

.preview-view-tabs {
  display: inline-flex;
  gap: 6px;
}

.preview-view-tab,
.copy-button {
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--muted-strong);
  min-height: 36px;
  padding: 0 12px;
  font-size: 0.85rem;
  font-weight: 600;
  transition:
    background 140ms ease,
    color 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
}

.preview-view-tab {
  cursor: pointer;
}

.preview-view-tab.is-active {
  border-color: rgba(27, 36, 50, 0.08);
  background: var(--panel-strong);
  color: var(--accent-strong);
}

.preview-view-tab:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.preview-view-tab:focus-visible,
.copy-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.copy-button {
  border-color: rgba(27, 36, 50, 0.08);
  background: rgba(255, 255, 255, 0.88);
}

.copy-button:hover {
  border-color: rgba(77, 100, 127, 0.18);
  color: var(--accent-strong);
}

.preview-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: auto;
  border: 1px solid rgba(27, 36, 50, 0.08);
  border-radius: 0 0 24px 24px;
  background: linear-gradient(180deg, #f6f7f5 0%, #f1f3f1 100%);
}

#preview-surface {
  width: 100%;
  min-height: 100%;
}

.preview-overlay {
  display: none;
}

.loading-card {
  width: 100%;
}

.loading-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.loading-badge {
  border: 1px solid rgba(27, 36, 50, 0.08);
  background: rgba(255, 255, 255, 0.88);
  color: var(--muted-strong);
}

.loading-card h3 {
  margin: 16px 0 0;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.loading-copy {
  margin: 10px 0 16px;
  color: var(--muted);
}

.loading-progress {
  position: relative;
  height: 6px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: rgba(77, 100, 127, 0.1);
  overflow: hidden;
}

.loading-progress-bar {
  display: block;
  width: 18%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.loading-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.loading-step {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 10px 12px;
  border: 1px solid rgba(27, 36, 50, 0.08);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--muted);
}

.loading-step.is-active,
.loading-step[data-state="active"] {
  border-color: rgba(77, 100, 127, 0.18);
  color: var(--accent-strong);
}

.loading-step[data-state="complete"] {
  color: var(--text);
}

.loading-step-index {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: rgba(77, 100, 127, 0.09);
  font-size: 0.72rem;
  font-weight: 700;
}

.loading-step-label {
  font-size: 0.85rem;
  font-weight: 600;
}

.preview-footnote {
  margin: 0;
  padding-top: 0;
  padding-bottom: 26px;
  font-size: 0.9rem;
}

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

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .composer {
    position: static;
    max-height: none;
  }

  .preview-panel {
    min-height: auto;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: calc(100% - 24px);
    padding: 18px 0 24px;
  }

  .app-header,
  .preview-header,
  .preview-toolbar,
  .group-head-split {
    grid-template-columns: 1fr;
    display: grid;
  }

  .app-header {
    gap: 12px;
  }

  .brand-block {
    align-items: flex-start;
  }

  .composer-intro,
  .form,
  .preview-header,
  .preview-frame,
  .preview-footnote {
    padding-left: 18px;
    padding-right: 18px;
  }

  .composer-intro,
  .preview-header {
    padding-top: 22px;
  }

  .form {
    padding-top: 18px;
    padding-bottom: 20px;
  }

  .source-grid,
  .loading-steps {
    grid-template-columns: 1fr;
  }

  .preview-badges,
  .preview-toolbar-actions,
  .metric-cluster {
    justify-content: flex-start;
  }
}