/* =========================================
   QuantumWriter — Lockdown Core Stylesheet
   Shell only. Page metrics flow from JS config.
   FULL MERGED VERSION — Preview Lock Fixed
   ========================================= */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #f8fafd;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --accent-primary: #2563eb;
  --accent-secondary: #3b82f6;
  --accent-soft: #dbeafe;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', Monaco, Consolas, monospace;
  --font-book: Georgia, 'Times New Roman', serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  --page-width: 600px;
  --page-height: 800px;
  --page-padding-top: 56px;
  --page-padding-right: 48px;
  --page-padding-bottom: 68px;
  --page-padding-left: 48px;
  --page-content-width: 504px;
  --page-content-height: 676px;
}

html,
body {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  background: linear-gradient(180deg, #eef4fb 0%, #f8fafd 100%);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.brand-shell {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-md);
}

.logo {
  font-size: clamp(3rem, 10vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #0f172a 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.05;
}

.tagline {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: var(--space-lg);
}

.tagline-highlight {
  color: var(--accent-primary);
  font-weight: 700;
}

.notification-area {
  min-height: 56px;
  margin-bottom: var(--space-lg);
}

.notification {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 14px 16px;
  animation: slideIn 0.3s ease;
}

.notification-content {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.notification-success {
  border-left-color: var(--success);
}

.notification-warning {
  border-left-color: var(--warning);
}

.notification-error {
  border-left-color: var(--error);
}

.notification-fade-out {
  opacity: 0;
  transition: opacity 0.25s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.studio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-lg);
  align-items: start;
}

.panel {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-normal);
}

.panel:hover {
  box-shadow: var(--shadow-lg);
}

.panel-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  background: var(--bg-tertiary);
}

.panel-header h2 {
  font-size: 1.22rem;
  font-weight: 700;
}

.panel-subtitle {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.pill {
  background: var(--accent-soft);
  color: var(--accent-primary);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

.panel-tools {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

.btn {
  appearance: none;
  border: 1px solid var(--border-light);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--bg-tertiary);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.btn-primary,
.support-dark {
  background: var(--text-primary);
  color: #ffffff;
  border-color: var(--text-primary);
}

.btn-primary:hover:not(:disabled),
.support-dark:hover:not(:disabled) {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.has-api-key {
  border-color: rgba(16, 185, 129, 0.45);
  background: rgba(16, 185, 129, 0.08);
  color: #047857;
}

.is-disabled,
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.stats-badge {
  margin-left: auto;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  padding: 10px 14px;
  font-size: 0.88rem;
  font-weight: 700;
}

.manuscript-input {
  width: calc(100% - var(--space-lg) * 2);
  margin: var(--space-lg);
  min-height: 340px;
  resize: vertical;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.manuscript-input:focus,
.metadata input:focus,
.modal-input:focus,
.modal-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.metadata {
  padding: 0 var(--space-lg) var(--space-lg);
  border: 0;
}

.metadata h3 {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.metadata-grid,
.metadata-grid-six {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.metadata input,
.modal-input,
.modal-textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.94rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.export-panel {
  padding: var(--space-lg);
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-light);
}

.generate-btn {
  width: 100%;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  flex-direction: column;
}

.btn-content {
  font-size: 1rem;
}

.btn-description {
  font-size: 0.82rem;
  opacity: 0.85;
  font-weight: 500;
}

.export-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  gap: var(--space-sm);
}

.export-note {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: var(--space-md);
}

/* =========================================
   PREVIEW
   ========================================= */

.preview {
  min-height: 560px;
  max-height: 680px;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 32px 24px 48px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  scroll-behavior: smooth;
}

.preview::-webkit-scrollbar {
  width: 8px;
}

.preview::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

.preview::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: var(--radius-full);
}

.preview::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.preview-placeholder {
  color: var(--text-muted);
  font-family: var(--font-sans);
  text-align: center;
  margin-top: 5rem;
}

/* =========================================
   HARD LOCK PAGE SYSTEM
   ========================================= */

.page {
  width: var(--page-width);
  height: var(--page-height);
  position: relative;
  background: #ffffff;
  margin: 0 auto;
  border: 1px solid #dbe3ec;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  box-sizing: border-box;
  flex: 0 0 auto;
  transition: box-shadow var(--transition-normal), transform var(--transition-fast);
  border-radius: 2px;
  display: block;
}

.page + .page {
  margin-top: 8px;
}

.page:hover {
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.page-content {
  position: absolute;
  top: var(--page-padding-top);
  right: var(--page-padding-right);
  bottom: var(--page-padding-bottom);
  left: var(--page-padding-left);
  overflow: hidden;
  box-sizing: border-box;
  font-family: var(--qw-font-body, var(--font-book));
  font-size: var(--qw-font-size-body, 16px);
  line-height: var(--qw-line-height-body, 1.55);
  font-weight: var(--qw-font-weight-body, 400);
  letter-spacing: var(--qw-letter-spacing-body, normal);
  word-spacing: var(--qw-word-spacing-body, normal);
  color: var(--text-primary);
}

.page-content > * {
  box-sizing: border-box;
}

.page-content p {
  margin: var(--qw-paragraph-margin, 0 0 0.95em);
  text-align: justify;
  text-indent: var(--qw-paragraph-indent, 1.6em);
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content .chapter-heading,
.page-content .part-heading,
.page-content .major-heading-1,
.page-content .major-heading-2,
.page-content .major-heading-3,
.page-content .sub-heading,
.page-content .front-title,
.page-content .front-subtitle {
  text-align: center;
  color: var(--text-primary);
  line-height: 1.25;
  text-indent: 0;
  margin: var(--qw-heading-margin, 1em 0 0.75em);
}

.page-content h1,
.page-content .front-title,
.page-content .major-heading-1 {
  font-size: 1.9rem;
  margin: 0 0 1.25rem;
  font-family: var(--font-sans);
  font-weight: 800;
}

.page-content h2,
.page-content .chapter-heading,
.page-content .part-heading,
.page-content .major-heading-2 {
  font-size: 1.28rem;
  margin: 1.45rem 0 0.85rem;
  font-family: var(--font-sans);
  font-weight: 700;
}

.page-content h3,
.page-content .sub-heading,
.page-content .major-heading-3 {
  font-size: 1rem;
  margin: 1rem 0 0.65rem;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page-content .front-subtitle {
  font-size: 1.05rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-secondary);
}

.page-content .front-author,
.page-content .scene-break {
  margin: var(--qw-special-block-margin, 1em 0);
  text-indent: 0;
  text-align: center;
}

.page-content .front-author {
  font-family: var(--font-book);
  font-style: italic;
  color: var(--text-secondary);
}

.page-content h1 + p,
.page-content h2 + p,
.page-content h3 + p,
.page-content .chapter-heading + p,
.page-content .part-heading + p,
.page-content .major-heading-1 + p,
.page-content .major-heading-2 + p,
.page-content .major-heading-3 + p,
.page-content .sub-heading + p,
.page-content blockquote + p,
.page-content .scene-break + p,
.page-content .front-author + p {
  text-indent: 0;
}

.page-content blockquote {
  margin: var(--qw-blockquote-margin, 1.1rem 0);
  padding: var(--qw-blockquote-padding, 0 0 0 1rem);
  border-left: 3px solid var(--border-medium);
  color: var(--text-secondary);
  text-indent: 0;
  font-style: italic;
}

.page-content ul,
.page-content ol {
  margin: var(--qw-list-margin, 0 0 1rem 1.5rem);
  padding-left: var(--qw-list-padding-left, 1rem);
}

.page-content li {
  margin-bottom: var(--qw-list-item-margin-bottom, 0.4rem);
}

.page-content .scene-break {
  letter-spacing: 0.32em;
  color: #94a3b8;
}

.page-number,
.page-footer {
  position: absolute;
  bottom: 24px;
  left: 0;
  right: 0;
  width: 100%;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
  font-family: var(--font-sans);
  font-weight: 600;
  pointer-events: none;
}

.measure-host {
  position: absolute;
  left: -99999px;
  top: 0;
  width: 0;
  height: 0;
  overflow: hidden;
  visibility: hidden;
  pointer-events: none;
}

.page-measure {
  position: static;
  box-shadow: none;
  border: 0;
  border-radius: 0;
  margin: 0;
}

.preview-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-light);
  background: var(--bg-tertiary);
}

.page-counter {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.export-roadmap,
.support-panel,
.module-mount,
.site-footer {
  margin-top: var(--space-xl);
}

.roadmap-grid,
.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  padding: var(--space-lg);
}

.roadmap-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  background: white;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.roadmap-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.roadmap-icon {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.roadmap-card h3 {
  margin-bottom: 6px;
}

.roadmap-card p,
.support-copy p,
.module-placeholder,
.copyright {
  color: var(--text-muted);
}

.support-actions,
.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: start;
}

.module-mount {
  padding: var(--space-lg);
  text-align: center;
}

.site-footer {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid var(--border-light);
  margin-top: var(--space-2xl);
}

.footer-separator {
  color: var(--text-muted);
  margin: 0 8px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: grid;
  place-items: center;
  padding: var(--space-lg);
  z-index: 1000;
  backdrop-filter: blur(2px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-backdrop[hidden] {
  display: none !important;
}

.modal {
  width: min(720px, 100%);
  max-height: min(85vh, 900px);
  overflow: auto;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-light);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-lg);
}

.modal-copy h3 {
  margin: 1rem 0 0.6rem;
}

.modal-copy p,
.modal-copy li,
.inline-hint {
  color: var(--text-secondary);
}

.modal-copy ol {
  padding-left: 1.25rem;
}

.api-status-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-full);
  background: var(--accent-soft);
  color: var(--accent-primary);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

@media (max-width: 700px) {
  #app {
    padding: var(--space-lg) var(--space-md);
  }

  .preview {
    padding: 24px 14px 36px;
    gap: 28px;
  }

  .page {
    width: min(100%, var(--page-width));
  }

  .page-content {
    left: 24px;
    right: 24px;
    top: var(--page-padding-top);
    bottom: 92px;
  }

  .metadata-grid,
  .metadata-grid-six,
  .roadmap-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .stats-badge {
    margin-left: 0;
  }

  .preview-footer,
  .panel-header,
  .modal-actions {
    align-items: stretch;
  }
}