/* ==========================================================================
   PDF PAGE EXTRACTOR - MODERN CSS DESIGN SYSTEM
   Pure Vanilla CSS - Zero build dependencies
   ========================================================================== */

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.2);
  --secondary: #0ea5e9;
  --secondary-hover: #0284c7;
  --accent: #10b981;
  --accent-light: #ecfdf5;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --warning: #f59e0b;
  
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --border: #e2e8f0;
  --border-focus: #a5b4fc;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --text-inverse: #ffffff;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);
  
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --max-w: 1200px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-hover);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 4.5rem 0;
}

.section-sm {
  padding: 2.5rem 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-main);
}

.brand-logo svg {
  color: var(--primary);
}

.brand-badge {
  font-size: 0.6875rem;
  padding: 0.2rem 0.5rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-sm);
  font-weight: 600;
  margin-left: 0.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 0.25rem;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--primary);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: var(--text-inverse);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-subtle);
  color: var(--text-main);
}

.btn-accent {
  background-color: var(--accent);
  color: var(--text-inverse);
}

.btn-accent:hover {
  background-color: #059669;
  color: var(--text-inverse);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary-light);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

.btn-danger {
  background-color: var(--danger-light);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background-color: var(--danger);
  color: var(--text-inverse);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.85rem 1.85rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Hero Section */
.hero-section {
  padding: 3.5rem 0 4.5rem 0;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, rgba(255, 255, 255, 0) 70%);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 840px;
  margin: 0 auto 2.5rem auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.hero-pill-badge {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 700px;
  margin: 0 auto 1.5rem auto;
}

.hero-features-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-feature-item svg {
  color: var(--accent);
}

/* Tool Workstation Container */
.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
}

/* Dropzone */
.dropzone {
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  background-color: #fafbfc;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background-color: var(--primary-light);
  transform: scale(1.005);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background-color: #ffffff;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.dropzone:hover .dropzone-icon {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.dropzone-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.dropzone-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.dropzone-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-top: 1.25rem;
}

.dropzone-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Workstation Active Area (Shown after PDF is loaded) */
.extractor-workbench {
  display: none;
}

.extractor-workbench.active {
  display: block;
}

/* File Info Bar */
.file-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.file-info-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.file-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: #fee2e2;
  color: #dc2626;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
  max-width: 320px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.2rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.badge-gray {
  background: #e2e8f0;
  color: #475569;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.badge-accent {
  background: var(--accent-light);
  color: var(--accent);
}

/* Selection Controls Bar */
.selection-toolbar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem;
  background-color: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
}

.range-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.range-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.range-label {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-main);
}

.range-helper {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.input-with-action {
  display: flex;
  gap: 0.5rem;
}

.text-input {
  flex: 1;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--text-main);
  background-color: var(--bg-main);
  transition: var(--transition);
}

.text-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background-color: #ffffff;
}

.preset-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.preset-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.preset-btn:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  border-color: var(--border-focus);
}

/* Visual Page Grid */
.pages-grid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.pages-grid-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
}

.pages-grid-stats {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
}

.pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
  max-height: 420px;
  overflow-y: auto;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--bg-main);
  margin-bottom: 1.5rem;
}

/* Custom Scrollbar */
.pages-grid::-webkit-scrollbar {
  width: 6px;
}
.pages-grid::-webkit-scrollbar-track {
  background: var(--bg-main);
}
.pages-grid::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

.page-card {
  position: relative;
  background: #ffffff;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.65rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
}

.page-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.page-card.selected {
  border-color: var(--primary);
  background-color: #f5f7ff;
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.page-preview-box {
  width: 100%;
  aspect-ratio: 1 / 1.35;
  background-color: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
  position: relative;
  overflow: hidden;
}

.page-preview-box canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.page-placeholder-icon {
  color: #cbd5e1;
}

.page-checkbox {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.9);
  border: 1.5px solid #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  color: transparent;
}

.page-card.selected .page-checkbox {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.page-num {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Extraction Mode & Action Section */
.extraction-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.mode-option-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background-color: #ffffff;
}

.mode-option-card:hover {
  border-color: var(--border-focus);
}

.mode-option-card.selected {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.mode-radio {
  margin-top: 0.2rem;
  accent-color: var(--primary);
}

.mode-info-title {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.mode-info-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Action Area */
.workbench-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  gap: 1rem;
  flex-wrap: wrap;
}

/* Progress Status Box */
.progress-container {
  display: none;
  padding: 1.25rem;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-md);
  margin-top: 1.5rem;
}

.progress-container.active {
  display: block;
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-focus);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Steps Process Section */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  position: relative;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #ffffff;
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* FAQ Accordion */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  gap: 1rem;
}

.faq-icon {
  color: var(--text-subtle);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  padding-bottom: 1.25rem;
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4338ca 100%);
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  text-align: center;
  color: #ffffff;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.cta-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-desc {
  font-size: 1.125rem;
  color: #e0e7ff;
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

/* Blog / Article Layout */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-focus);
}

.blog-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-bottom: 0.75rem;
}

.blog-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.blog-excerpt {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex: 1;
}

.article-container {
  max-width: 780px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 3.5rem 3rem;
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 2.5rem 0 1rem 0;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 2rem 0 0.75rem 0;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body code {
  font-family: var(--font-mono);
  background-color: var(--bg-subtle);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--primary);
}

.article-callout {
  padding: 1.5rem;
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 2rem 0;
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-main);
  background: var(--bg-surface);
  transition: var(--transition);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  padding: 1rem 1.25rem;
  background: #ffffff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-main);
  min-width: 280px;
  max-width: 420px;
  pointer-events: auto;
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast.success {
  border-left: 4px solid var(--accent);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.info {
  border-left: 4px solid var(--primary);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: #ffffff;
  border-top: 1px solid var(--border);
  padding: 4.5rem 0 2.5rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin-top: 1rem;
  max-width: 320px;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-subtle);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Rules */
@media (max-width: 900px) {
  .hero-title {
    font-size: 2.25rem;
  }
  
  .contact-grid, .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .extraction-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .mobile-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: var(--shadow-lg);
  }
  
  .tool-card {
    padding: 1.25rem;
  }
  
  .article-container {
    padding: 2rem 1.5rem;
  }
  
  .article-title {
    font-size: 1.85rem;
  }
  
  .section {
    padding: 3rem 0;
  }
}