* {
  box-sizing: border-box;
}

:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --surface-soft: #fafafa;
  --sidebar: #eceff1;
  --border: #d5d9de;
  --border-strong: #c0c6cd;
  --text: #20262d;
  --text-soft: #5b6672;
  --primary: #1f4f82;
  --primary-soft: #e8eef5;
  --success-bg: #eef6ee;
  --success-text: #24552c;
  --error-bg: #fbeeee;
  --error-text: #8b2e2e;
  --shadow-soft: 0 1px 0 rgba(0, 0, 0, 0.03);
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
}

.sidebar {
  background: var(--sidebar);
  border-right: 1px solid var(--border-strong);
  padding: 24px;
}

.brand-block {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-strong);
}

.brand-kicker,
.page-overline,
.meta-label {
  margin: 0 0 6px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.brand-block h1,
.topbar h2,
.panel-heading h3,
.group-title h4,
.sidebar-note h2 {
  margin: 0;
  font-weight: 700;
}

.brand-block h1 {
  font-size: 1.5rem;
}

.brand-text,
.page-intro,
.panel-heading p,
.group-title p,
.sidebar-note li,
.sidebar-note,
.status-message,
.contract-preview {
  line-height: 1.55;
}

.brand-text,
.page-intro,
.panel-heading p,
.group-title p,
.sidebar-note,
.toolbar-tag,
.status-message {
  color: var(--text-soft);
}

.nav-panel {
  display: grid;
  gap: 8px;
  margin: 24px 0;
}

.nav-item {
  appearance: none;
  width: 100%;
  text-align: left;
  padding: 11px 12px;
  border: 1px solid var(--border-strong);
  background: #f7f8f9;
  color: var(--text);
  cursor: pointer;
}

.nav-item.is-active {
  background: #ffffff;
  border-color: #9fb1c4;
  color: var(--primary);
  font-weight: 700;
}

.nav-item[disabled] {
  opacity: 0.65;
  cursor: not-allowed;
}

.sidebar-note {
  margin-top: 28px;
  padding: 14px;
  background: #f7f8f9;
  border: 1px solid var(--border-strong);
}

.sidebar-note h2 {
  font-size: 1rem;
  margin-bottom: 10px;
}

.sidebar-note ul {
  margin: 0;
  padding-left: 18px;
}

.main-area {
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.topbar h2 {
  font-size: 1.6rem;
}

.page-intro {
  margin: 10px 0 0;
  max-width: 72ch;
}

.topbar-meta {
  display: flex;
  gap: 12px;
}

.meta-box {
  min-width: 132px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.meta-box strong {
  font-size: 0.96rem;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(380px, 620px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.content-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.panel-heading {
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-soft);
}

.panel-heading h3 {
  font-size: 1.1rem;
}

.panel-heading p,
.group-title p {
  margin: 6px 0 0;
}

.contract-form {
  padding: 18px;
}

.form-group + .form-group {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.group-title {
  margin-bottom: 14px;
}

.group-title h4 {
  font-size: 1rem;
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field-span-2 {
  grid-column: span 2;
}

.field span {
  font-size: 0.92rem;
  font-weight: 700;
}

.field input {
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  background: #fff;
  color: var(--text);
}

.field input:focus {
  outline: 2px solid #dbe7f2;
  border-color: #8da3ba;
}

.form-footer {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.primary-button {
  appearance: none;
  border: 1px solid #163e68;
  background: var(--primary);
  color: #ffffff;
  padding: 11px 16px;
  font-weight: 700;
  cursor: pointer;
}

.primary-button:hover {
  filter: brightness(0.98);
}

.primary-button[disabled] {
  opacity: 0.7;
  cursor: wait;
}

.status-message {
  min-height: 24px;
  margin-top: 14px;
}

.status-message.is-success,
.status-message.is-error {
  padding: 12px 14px;
  border: 1px solid var(--border);
}

.status-message.is-success {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: #bfd3c0;
}

.status-message.is-error {
  background: var(--error-bg);
  color: var(--error-text);
  border-color: #dec0c0;
}

.status-message a {
  color: inherit;
  font-weight: 700;
}

.preview-panel {
  min-height: 100%;
}

.preview-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 18px 0;
}

.toolbar-tag {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  font-size: 0.85rem;
}

.document-frame {
  padding: 18px;
}

.contract-preview {
  margin: 0;
  min-height: 820px;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--border-strong);
  font-family: "Times New Roman", Times, serif;
  font-size: 1rem;
  white-space: pre-wrap;
  color: #222;
  overflow: auto;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-strong);
  }

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

@media (max-width: 720px) {
  .main-area,
  .sidebar {
    padding: 16px;
  }

  .topbar {
    flex-direction: column;
  }

  .topbar-meta {
    width: 100%;
    flex-direction: column;
  }

  .meta-box {
    width: 100%;
  }

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

  .field-span-2 {
    grid-column: auto;
  }

  .contract-preview {
    min-height: 560px;
    padding: 18px;
  }
}