/* TFI Document Comparison Tool - Stylesheet */
/* Colors: Warm light background, Navy headings and text, Orange accent */

:root {
  --bg-warm: #FAF7F2;
  --bg-card: #FFFFFF;
  --bg-card-subtle: #F6F3EC;
  --border-card: #E8E2D8;
  --border-focus: #D9531E;

  --navy-dark: #0F1E36;
  --navy-text: #1A2A44;
  --navy-muted: #586982;
  --navy-light-border: #DDE3EA;

  --orange-accent: #D9531E;
  --orange-hover: #C24614;
  --orange-active: #A83B10;
  --orange-subtle: #FFF7F2;

  --diff-removed-color: #B02A37;
  --diff-removed-bg: #FCE8E6;
  --diff-added-color: #198754;
  --diff-added-bg: #E8F5E9;

  --shadow-soft: 0 2px 8px rgba(15, 30, 54, 0.05), 0 10px 24px rgba(15, 30, 54, 0.04);
  --shadow-active: 0 4px 14px rgba(15, 30, 54, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-warm);
  color: var(--navy-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Utility */
.hidden {
  display: none !important;
}

/* Header */
.tfi-header {
  background-color: var(--navy-dark);
  color: #FFFFFF;
  padding: 16px 24px;
  box-shadow: 0 2px 8px rgba(15, 30, 54, 0.15);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.header-nav .nav-link {
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.header-nav .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

/* Main Container */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 64px 20px;
}

/* Gate Cards (Sign-in and Subscription) */
.gate-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 50vh;
}

.gate-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: 40px 32px;
  max-width: 480px;
  width: 100%;
  text-align: center;
}

.gate-title {
  color: var(--navy-dark);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.gate-message {
  color: var(--navy-muted);
  font-size: 1.05rem;
  margin-bottom: 24px;
}

/* Tool Hero */
.tool-hero {
  text-align: center;
  margin-bottom: 32px;
}

.tool-title {
  color: var(--navy-dark);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.tool-subtitle {
  color: var(--navy-muted);
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.privacy-badge {
  display: inline-block;
  background-color: var(--bg-card-subtle);
  color: var(--navy-dark);
  border: 1px solid var(--border-card);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Upload Section */
.upload-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: 32px;
  margin-bottom: 32px;
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.upload-box {
  position: relative;
  border: 2px dashed var(--navy-light-border);
  border-radius: var(--radius-md);
  background-color: var(--bg-warm);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
  outline: none;
}

.upload-box:hover,
.upload-box:focus {
  border-color: var(--orange-accent);
  background-color: var(--orange-subtle);
}

.upload-box.is-dragover {
  border-color: var(--orange-accent);
  background-color: #FFEFE6;
  box-shadow: 0 0 0 4px rgba(217, 83, 30, 0.15);
}

.upload-box.has-file {
  border-style: solid;
  border-color: var(--border-card);
  background-color: #FFFFFF;
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
}

.upload-box-title {
  color: var(--navy-dark);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.upload-prompt {
  color: var(--navy-muted);
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.upload-formats {
  color: var(--navy-muted);
  font-size: 0.825rem;
}

.file-info {
  margin-top: 14px;
  padding: 12px;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  position: relative;
  z-index: 3;
}

.file-name {
  font-weight: 600;
  color: var(--navy-dark);
  font-size: 0.95rem;
  word-break: break-all;
}

.file-size {
  font-size: 0.8rem;
  color: var(--navy-muted);
}

/* Error Banner */
.error-banner {
  background-color: #FFF2F2;
  border: 1px solid #F5C6CB;
  color: #721C24;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin-bottom: 20px;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--orange-accent);
  color: #FFFFFF;
  border-color: var(--orange-accent);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--orange-hover);
  border-color: var(--orange-hover);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--orange-active);
  border-color: var(--orange-active);
}

.btn-primary:disabled {
  background-color: #E2DDD5;
  border-color: #E2DDD5;
  color: #8C8477;
  cursor: not-allowed;
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--navy-dark);
  border-color: var(--navy-light-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-card-subtle);
  border-color: var(--border-card);
}

.btn-secondary:disabled {
  background-color: #F8F7F4;
  border-color: #E6E1D8;
  color: #A9A296;
  cursor: not-allowed;
}

.btn-outline {
  background-color: transparent;
  color: var(--navy-dark);
  border-color: var(--navy-light-border);
}

.btn-outline:hover {
  background-color: var(--bg-card-subtle);
  border-color: var(--border-card);
}

.btn-text {
  background: none;
  border: none;
  color: var(--orange-accent);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 8px;
  text-decoration: underline;
}

.btn-text:hover {
  color: var(--orange-hover);
}

.btn-large {
  padding: 14px 36px;
  font-size: 1.1rem;
}

.compare-action-bar {
  text-align: center;
}

/* Results Section */
.results-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: 24px;
}

.results-toolbar {
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 20px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.summary-line {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-dark);
}

.toolbar-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* View Selector */
.view-toggle {
  display: inline-flex;
  border: 1px solid var(--navy-light-border);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  overflow: hidden;
}

.btn-toggle {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 16px;
  border: none;
  background-color: #FFFFFF;
  color: var(--navy-dark);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-toggle.active {
  background-color: var(--orange-accent);
  color: #FFFFFF;
}

.btn-toggle:hover:not(.active) {
  background-color: var(--bg-card-subtle);
}

/* Change Navigation */
.change-navigation {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.change-counter {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy-muted);
}

.toolbar-utility {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

/* Diff Styling */
.diff-container {
  min-height: 200px;
  background-color: #FFFFFF;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

/* Empty / Identical Notice */
.diff-notice-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--navy-muted);
  font-size: 1.05rem;
  font-weight: 500;
}

/* Inline Diff */
.diff-inline-flow {
  padding: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.diff-removed {
  color: var(--diff-removed-color);
  background-color: var(--diff-removed-bg);
  text-decoration: line-through;
  padding: 1px 3px;
  border-radius: 2px;
}

.diff-added {
  color: var(--diff-added-color);
  background-color: var(--diff-added-bg);
  text-decoration: underline;
  padding: 1px 3px;
  border-radius: 2px;
}

.diff-unchanged {
  color: var(--navy-text);
}

/* Side by Side Diff */
.diff-sbs-table {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.diff-sbs-header-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--navy-dark);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 1px solid var(--navy-dark);
}

.diff-sbs-header {
  padding: 10px 16px;
}

.diff-sbs-header-left {
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.diff-sbs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--bg-card-subtle);
  font-size: 0.95rem;
  line-height: 1.6;
}

.diff-sbs-row-modified {
  background-color: #FFFDF9;
}

.diff-sbs-row-removed {
  background-color: #FFF5F5;
}

.diff-sbs-row-added {
  background-color: #F6FFF8;
}

.diff-sbs-side {
  display: flex;
  align-items: flex-start;
  padding: 6px 12px;
  overflow-x: auto;
}

.diff-sbs-side-left {
  border-right: 1px solid var(--border-card);
}

.diff-line-number {
  min-width: 36px;
  user-select: none;
  font-size: 0.8rem;
  color: #8C99A8;
  text-align: right;
  padding-right: 12px;
  line-height: 1.6;
}

.diff-sbs-content {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-word;
}

.diff-spacer {
  display: block;
  min-height: 1.4em;
  background: repeating-linear-gradient(
    45deg,
    #F7F6F2,
    #F7F6F2 4px,
    #FFFFFF 4px,
    #FFFFFF 8px
  );
  border-radius: 2px;
}

/* Active Highlight during navigation */
.current-change-focus {
  outline: 2px solid var(--orange-accent) !important;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(217, 83, 30, 0.25) !important;
  animation: pulseHighlight 1.5s ease;
}

@keyframes pulseHighlight {
  0% {
    box-shadow: 0 0 0 6px rgba(217, 83, 30, 0.5);
  }
  100% {
    box-shadow: 0 0 0 4px rgba(217, 83, 30, 0.25);
  }
}

/* Print Layout */
.print-header {
  display: none;
}

@media print {
  body {
    background-color: #FFFFFF !important;
    color: #000000 !important;
  }

  .tfi-header,
  .upload-section,
  .results-toolbar,
  .privacy-badge,
  .tool-hero,
  .gate-container {
    display: none !important;
  }

  .main-content {
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .results-section {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }

  .print-header {
    display: block !important;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #0F1E36;
  }

  .print-title {
    font-size: 1.5rem;
    color: #0F1E36;
    margin-bottom: 6px;
  }

  .print-meta {
    font-size: 0.95rem;
    color: #333333;
  }

  .diff-container {
    border: none !important;
    overflow: visible !important;
  }

  .diff-sbs-row {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .diff-removed {
    color: #A00 !important;
    text-decoration: line-through !important;
    background-color: transparent !important;
  }

  .diff-added {
    color: #080 !important;
    text-decoration: underline !important;
    background-color: transparent !important;
  }
}

/* Responsive Mobile Layout */
@media (max-width: 768px) {
  .upload-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .view-toggle,
  .change-navigation,
  .toolbar-utility {
    width: 100%;
    justify-content: center;
  }

  .btn-large {
    width: 100%;
  }

  .diff-sbs-header {
    font-size: 0.85rem;
    padding: 8px 10px;
  }

  .diff-sbs-side {
    padding: 6px 8px;
    font-size: 0.875rem;
  }

  .diff-line-number {
    min-width: 24px;
    padding-right: 6px;
  }
}