:root {
  --bg: #f3f4f6;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --line: #d1d5db;
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
}

* {
  box-sizing: border-box;
}

.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-overlay.hidden {
  display: none;
}

.login-card {
  background: var(--panel);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  padding: 36px 32px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.login-card h1 {
  margin-top: 4px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-btn {
  width: 100%;
  padding: 14px;
  font-size: 15px;
}

.toolbar-btn-danger {
  background: #fee2e2;
  color: #991b1b;
}

.toolbar-btn-danger:hover {
  background: #fecaca;
}

.login-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 10px;
  color: #991b1b;
  padding: 10px 12px;
  font-size: 13px;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  padding: 20px;
}

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

.app-shell {
  display: grid;
  grid-template-columns: minmax(360px, 460px) minmax(0, 1fr);
  gap: 20px;
  height: calc(100vh - 40px);
}

.app-shell.sidebar-hidden {
  grid-template-columns: minmax(0, 1fr);
}

.app-shell.sidebar-hidden .control-panel {
  display: none;
}

.control-panel,
.preview-panel {
  background: var(--panel);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.control-panel {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
}

.preview-panel {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.1;
}

.subtitle,
.hint,
.preview-toolbar p,
.field small {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.field-grid,
.margin-grid {
  display: grid;
  gap: 12px;
}

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

.margin-card,
.font-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: #fafafa;
}

.margin-card-title,
.font-card-title {
  font-weight: 700;
  margin-bottom: 12px;
}

.margin-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.font-size-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.font-size-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 12px;
  background: #eef2ff;
  color: #1e3a8a;
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
}

.font-size-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.font-size-display {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.font-size-display strong {
  font-size: 20px;
}

.font-size-display small {
  color: var(--muted);
  line-height: 1.4;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span {
  font-weight: 600;
}

.field input[type="text"],
.field input[type="password"],
.field input[type="number"],
.field textarea,
.field input[type="file"],
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 12px 14px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus,
.field textarea:focus,
.field select:focus,
.field input[type="password"]:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

.markdown-field {
  flex: 1;
}

.markdown-field textarea {
  min-height: 320px;
  resize: vertical;
  line-height: 1.6;
}

.button-row {
  display: flex;
  gap: 12px;
}

.btn,
.toolbar-btn {
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.btn:hover,
.toolbar-btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.65;
  cursor: wait;
  transform: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary,
.toolbar-btn {
  background: #eef2ff;
  color: #1e3a8a;
}

.status {
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 12px 14px;
  color: #334155;
}

.preview-toolbar {
  padding: 18px 22px;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.preview-toolbar p {
  margin-top: 4px;
}

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

.page-count-badge {
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-weight: 700;
  white-space: nowrap;
}

.preview-canvas-wrap {
  flex: 1;
  overflow: auto;
  padding: 20px;
  background: #e5e7eb;
}

.preview-canvas {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.doc-page {
  background: #ffffff;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.18);
  overflow: hidden;
  flex: 0 0 auto;
}

.doc-page.portrait {
  width: 210mm;
  height: 297mm;
}

.doc-page.landscape {
  width: 297mm;
  height: 210mm;
}

.doc-page-inner {
  height: 100%;
  padding: var(--page-margin-top, 14mm) var(--page-margin-right, 14mm) var(--page-margin-bottom, 16mm) var(--page-margin-left, 14mm);
  display: flex;
  flex-direction: column;
  --doc-font-size: 7pt;
}

.preview-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8mm;
  flex: 0 0 auto;
}

.preview-header-left img {
  max-height: 28px;
  width: auto;
  display: block;
}

.preview-header-right {
  text-align: right;
  font-size: var(--doc-font-size, 7pt);
  line-height: 1.4;
  max-width: 72%;
}

.preview-separator {
  border-bottom: 1px solid #111827;
  margin: 4mm 0 5mm;
  flex: 0 0 auto;
}

.doc-page-content {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

.markdown-body {
  color: #1f2937;
  font-size: var(--doc-font-size, 7pt);
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: #111827;
  line-height: 1.25;
  margin-top: 1.3em;
  margin-bottom: 0.45em;
}

.markdown-body h1 {
  font-size: calc(var(--doc-font-size, 7pt) * 2);
}

.markdown-body h2 {
  font-size: calc(var(--doc-font-size, 7pt) * 1.57);
}

.markdown-body h3 {
  font-size: calc(var(--doc-font-size, 7pt) * 1.28);
}

.markdown-body h4 {
  font-size: calc(var(--doc-font-size, 7pt) * 1.14);
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body table,
.markdown-body pre {
  margin-top: 0;
  margin-bottom: 0.9em;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.4em;
}

.markdown-body li + li {
  margin-top: 0.2em;
}

.markdown-body blockquote {
  border-left: 3px solid #dbe4ff;
  padding: 0.35em 0.8em;
  color: #374151;
  background: #f8fbff;
}

.markdown-body code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background: #f3f4f6;
  padding: 0.1em 0.25em;
  border-radius: 4px;
  font-size: 0.95em;
}

.markdown-body pre {
  background: #0f172a;
  color: #e5e7eb;
  padding: 10px 12px;
  border-radius: 8px;
  overflow: hidden;
  white-space: pre-wrap;
  word-break: break-word;
}

.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.markdown-body table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: var(--doc-font-size, 7pt);
}

.markdown-body th,
.markdown-body td {
  border: 1px solid #d1d5db;
  padding: 6px 7px;
  vertical-align: top;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
  hyphens: auto;
}

.markdown-body th {
  background: #f3f4f6;
  text-align: left;
  font-weight: 700;
}

.markdown-body img {
  max-width: 100%;
  border-radius: 10px;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid #d1d5db;
  margin: 1.25em 0;
}

.markdown-body a {
  color: #1d4ed8;
  text-decoration: none;
  overflow-wrap: anywhere;
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .preview-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .preview-toolbar-actions {
    justify-content: flex-start;
  }
}