:root {
  --bg: #f1f3f4;
  --surface: #ffffff;
  --surface-soft: #f8f9fa;
  --text: #202124;
  --muted: #5f6368;
  --line: #dadce0;
  --accent: #1a73e8;
  --accent-strong: #185abc;
  --danger: #d93025;
  --success: #188038;
  --shadow-sm: 0 1px 2px rgba(60, 64, 67, 0.16);
  --shadow-md: 0 1px 3px rgba(60, 64, 67, 0.18), 0 4px 8px rgba(60, 64, 67, 0.12);
  --shadow-lg: 0 2px 8px rgba(60, 64, 67, 0.18), 0 12px 28px rgba(60, 64, 67, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 1px solid transparent;
  border-radius: 0;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 500;
  cursor: pointer;
  transition: background 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

button:hover {
  background: var(--accent-strong);
  box-shadow: 0 1px 3px rgba(26, 115, 232, 0.2);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.secondary-button,
.ghost-button {
  background: #fff;
  color: var(--text);
  border-color: var(--line);
}

.secondary-button:hover,
.ghost-button:hover {
  background: var(--surface-soft);
}

.hidden {
  display: none !important;
}

.app-shell {
  min-height: 100vh;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.login-panel {
  width: min(100%, 480px);
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
}

.login-copy {
  margin-bottom: 1.5rem;
}

.login-copy h1 {
  margin: 0 0 0.75rem;
}

.login-form {
  display: grid;
  gap: 1rem;
}

.login-form label,
.document-form label {
  display: grid;
  gap: 0.45rem;
}

.login-form input,
.document-form input,
.document-form textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0;
  background: #fff;
  color: var(--text);
}

.login-form input:focus,
.document-form input:focus,
.document-form textarea:focus {
  outline: 0;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.document-form input.is-invalid,
.document-form textarea.is-invalid {
  border-color: var(--danger);
  background: #fff7f7;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  background: #fff;
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.workspace-shell {
  padding: 1.5rem;
}

.topbar h1,
.summary-card h2,
.panel h3 {
  margin: 0;
}

.subtle-copy,
.muted {
  color: var(--muted);
}

.eyebrow,
.section-label {
  margin: 0 0 0.35rem;
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.topbar-actions,
.panel-heading,
.action-row,
.document-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.topbar-actions {
  justify-content: flex-end;
  width: 100%;
}

.summary-grid,
.generate-layout,
.dynamic-fields {
  display: grid;
  gap: 1rem;
}

.summary-grid {
  grid-template-columns: 1fr 1fr;
  margin-bottom: 1rem;
}

.generate-layout {
  grid-template-columns: minmax(360px, 420px) minmax(0, 1fr);
  align-items: stretch;
}

.summary-card,
.panel {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}

.accent-card {
  background: linear-gradient(180deg, #1a73e8 0%, #1765cc 100%);
  color: #fff;
}

.accent-card .eyebrow,
.accent-card .muted {
  color: rgba(255, 255, 255, 0.84);
}

.panel-heading {
  justify-content: space-between;
}

.particulars-panel {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 210px);
}

.document-form {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
}

.dynamic-fields {
  flex: 1 1 auto;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 210px);
}

.dynamic-fields.two-column {
  grid-template-columns: 1fr 1fr;
}

.field-hint {
  color: var(--muted);
  font-size: 0.84rem;
}

.field-error {
  min-height: 1.1rem;
  color: var(--danger);
  font-size: 0.84rem;
  font-weight: 500;
}

.form-feedback {
  padding: 0.9rem 1rem;
  border: 1px solid #f2c3c0;
  background: #fce8e6;
  color: #8c1d18;
  font-weight: 500;
}

.form-feedback.is-success {
  border-color: #b7dfc4;
  background: #e6f4ea;
  color: #137333;
}

.preview-panel iframe {
  width: 100%;
  flex: 1 1 auto;
  min-height: calc(100vh - 320px);
  border: 1px solid var(--line);
  background: #fff;
}

.document-links a {
  color: var(--accent-strong);
  font-weight: 500;
}

@media (max-width: 1180px) {
  .summary-grid,
  .generate-layout,
  .dynamic-fields.two-column {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .workspace-shell,
  .login-shell {
    padding: 1rem;
  }

  .topbar,
  .topbar-actions,
  .panel-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar,
  .panel,
  .summary-card,
  .login-panel {
    padding: 1rem;
  }

  .preview-panel iframe {
    min-height: 420px;
  }
}