/* ============================================================
   BankingFormats.in - Professional Banking Content Site
   Comprehensive CSS for SBI Bank Statement Request Letter Page
   ============================================================ */

/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #1a4b8c;
  --color-primary-dark: #0f3366;
  --color-primary-light: #2d6cc0;
  --color-accent: #e8a317;
  --color-accent-light: #fdf3dc;
  --color-success: #1a8c4b;
  --color-success-light: #e6f7ed;
  --color-warning: #c47800;
  --color-warning-light: #fff8e6;
  --color-danger: #c0392b;
  --color-danger-light: #fde8e6;
  --color-info: #2980b9;
  --color-info-light: #e8f4fd;

  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a5a;
  --color-text-light: #6b7280;
  --color-bg: #f8f9fc;
  --color-bg-white: #ffffff;
  --color-bg-alt: #f0f2f8;
  --color-border: #e2e5ed;
  --color-border-light: #eef0f5;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Courier New', Courier, monospace;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --container-max: 1200px;
  --content-max: 780px;
  --sidebar-width: 280px;

  --transition: all 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

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

a:hover {
  color: var(--color-primary-light);
  text-decoration: underline;
}

/* ===== Container ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Disclaimer Banner ===== */
.disclaimer-banner {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.9);
  font-size: 0.8rem;
  padding: 8px 0;
  text-align: center;
}

.disclaimer-banner .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.disclaimer-banner i {
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary-dark);
}

.logo i {
  color: var(--color-accent);
  font-size: 1.4rem;
}

.logo-dot {
  color: var(--color-accent);
}

.main-nav {
  display: flex;
  gap: 28px;
}

.main-nav a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.main-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--color-text);
  cursor: pointer;
  padding: 8px;
}

/* ===== Breadcrumb ===== */
.breadcrumb-bar {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border-light);
  padding: 10px 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  font-size: 0.82rem;
  color: var(--color-text-light);
  gap: 4px;
}

.breadcrumb li:not(:last-child)::after {
  content: '\203A';
  margin-left: 8px;
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-text-light);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

/* ===== Main Content Layout ===== */
.main-content {
  padding: 30px 0 60px;
}

.content-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 40px;
  align-items: start;
}

/* ===== Sidebar / TOC ===== */
.sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.toc-wrapper {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border-light);
}

.toc-nav ul {
  list-style: none;
}

.toc-nav > ul > li {
  margin-bottom: 6px;
}

.toc-nav > ul > li > a {
  display: block;
  padding: 6px 10px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.toc-nav > ul > li > a:hover,
.toc-nav > ul > li > a.active {
  color: var(--color-primary);
  background: var(--color-info-light);
  border-left-color: var(--color-primary);
  text-decoration: none;
}

.toc-nav > ul > li > ul {
  margin-left: 14px;
  margin-top: 4px;
}

.toc-nav > ul > li > ul > li > a {
  display: block;
  padding: 3px 10px;
  font-size: 0.78rem;
  color: var(--color-text-light);
  border-left: 2px solid var(--color-border-light);
  transition: var(--transition);
}

.toc-nav > ul > li > ul > li > a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary-light);
  text-decoration: none;
}

/* ===== Article Content ===== */
.article-content {
  max-width: var(--content-max);
}

.article-content section {
  margin-bottom: 48px;
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--color-accent);
  line-height: 1.35;
}

.article-content h3 {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  margin-top: 24px;
  line-height: 1.4;
}

.article-content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.article-content p {
  margin-bottom: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Article Header ===== */
.article-header {
  margin-bottom: 32px;
}

.article-meta-top {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

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

.article-header h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--color-text-light);
}

.meta-item i {
  color: var(--color-primary-light);
  font-size: 0.9rem;
}

.article-summary {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
}

.article-summary p {
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 0;
  line-height: 1.7;
}

/* ===== Quick Action Box ===== */
.quick-action-box {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 40px;
  color: white;
}

.quick-action-box h3 {
  color: white;
  font-size: 1.1rem;
  margin-bottom: 16px;
  margin-top: 0;
}

.quick-action-box h3 i {
  color: var(--color-accent);
  margin-right: 4px;
}

.quick-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.quick-link-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
  text-decoration: none;
}

.quick-link-btn:hover {
  background: rgba(255,255,255,0.22);
  text-decoration: none;
  color: white;
  transform: translateY(-1px);
}

/* ===== Info Card ===== */
.info-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
  box-shadow: var(--shadow-sm);
}

.info-card h3 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 20px;
}

.info-card h3 i {
  margin-right: 8px;
  color: var(--color-accent);
}

/* ===== Use Case Grid ===== */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.use-case-item {
  padding: 18px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.use-case-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.use-case-icon {
  width: 42px;
  height: 42px;
  background: var(--color-info-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.use-case-icon i {
  font-size: 1.1rem;
  color: var(--color-primary);
}

.use-case-item h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.use-case-item p {
  font-size: 0.86rem;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ===== Callout Boxes ===== */
.callout {
  display: flex;
  gap: 14px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  font-size: 0.92rem;
  line-height: 1.65;
}

.callout > i {
  font-size: 1.2rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.callout p, .callout div {
  color: inherit;
}

.callout-warning {
  background: var(--color-warning-light);
  border: 1px solid #f0d78e;
  color: #7c5b00;
}

.callout-warning > i {
  color: var(--color-warning);
}

.callout-tip {
  background: var(--color-success-light);
  border: 1px solid #b0dfc4;
  color: #0f5c32;
}

.callout-tip > i {
  color: var(--color-success);
}

.callout-info {
  background: var(--color-info-light);
  border: 1px solid #a8d4f2;
  color: #164e73;
}

.callout-info > i {
  color: var(--color-info);
}

/* ===== Format Breakdown ===== */
.format-breakdown {
  margin: 24px 0;
}

.format-item {
  display: flex;
  gap: 18px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.format-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.format-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: 2px;
}

.format-content h3 {
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--color-text);
}

.format-content p {
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.format-content p:last-child {
  margin-bottom: 0;
}

/* ===== Sample Letter Cards ===== */
.sample-letter-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.sample-letter-card:hover {
  box-shadow: var(--shadow-lg);
}

.sample-header {
  padding: 24px 28px 18px;
  border-bottom: 1px solid var(--color-border-light);
}

.sample-badge {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.sample-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 0;
  margin-bottom: 10px;
}

.sample-description {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.6;
}

.letter-block {
  position: relative;
  background: #fafbfd;
  border-top: 3px solid var(--color-primary);
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--color-primary);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 5;
}

.copy-btn:hover {
  background: var(--color-primary-dark);
  transform: scale(1.02);
}

.copy-btn.copied {
  background: var(--color-success);
}

.letter-content {
  padding: 24px 28px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--color-text);
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-x: auto;
}

/* ===== Step-by-Step Process ===== */
.steps-container {
  margin: 24px 0;
}

.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  position: relative;
}

.step-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 26px;
  top: 52px;
  bottom: -12px;
  width: 2px;
  background: var(--color-border);
}

.step-number {
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  height: fit-content;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

.step-content {
  flex: 1;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}

.step-content h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--color-primary-dark);
}

.step-content p {
  font-size: 0.92rem;
  margin-bottom: 0;
}

/* ===== Alternatives Grid ===== */
.alternatives-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.alt-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.alt-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.alt-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.alt-icon i {
  font-size: 1.2rem;
  color: white;
}

.alt-card h3 {
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: 6px;
  color: var(--color-text);
}

.alt-best-for {
  font-size: 0.82rem;
  color: var(--color-success);
  margin-bottom: 12px;
  font-weight: 500;
}

.alt-card p {
  font-size: 0.88rem;
}

.alt-card ol {
  font-size: 0.86rem;
  padding-left: 20px;
  margin-bottom: 12px;
}

.alt-card li {
  font-size: 0.86rem;
  margin-bottom: 4px;
}

.alt-limitation {
  background: var(--color-warning-light);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.82rem;
  color: #7c5b00;
  line-height: 1.5;
  margin-top: 12px;
}

.alt-limitation i {
  color: var(--color-warning);
  margin-right: 4px;
}

/* ===== Comparison Table ===== */
.comparison-table-wrapper {
  margin: 32px 0;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.comparison-table-wrapper h3 {
  padding: 18px 24px;
  margin: 0;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  font-size: 1rem;
  color: var(--color-primary-dark);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.comparison-table thead {
  background: var(--color-primary-dark);
  color: white;
}

.comparison-table th {
  padding: 12px 18px;
  text-align: left;
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.comparison-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
}

.comparison-table tbody tr:hover {
  background: var(--color-bg);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.text-green { color: var(--color-success); }
.text-red { color: var(--color-danger); }
.text-orange { color: var(--color-warning); }

/* ===== Policy Grid ===== */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.policy-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.policy-card h3 {
  font-size: 1.02rem;
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.policy-card h3 i {
  color: var(--color-accent);
}

.policy-card p, .policy-card li {
  font-size: 0.88rem;
}

.policy-note {
  font-style: italic;
  font-size: 0.82rem !important;
  color: var(--color-text-light) !important;
  margin-top: 8px;
}

/* ===== Mistakes List ===== */
.mistakes-list {
  margin: 24px 0;
}

.mistake-item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.mistake-item:last-child {
  border-bottom: none;
}

.mistake-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.mistake-icon i {
  font-size: 1.1rem;
  color: var(--color-danger);
}

.mistake-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.mistake-content p {
  font-size: 0.88rem;
  margin-bottom: 0;
}

/* ===== FAQ ===== */
.faq-container {
  margin: 24px 0;
}

.faq-item {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--color-primary-light);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 22px;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  gap: 16px;
}

.faq-question span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.faq-question i {
  color: var(--color-primary);
  font-size: 0.85rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-question i {
  transform: rotate(180deg);
}

.faq-question:hover {
  background: var(--color-bg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 22px 20px;
}

.faq-answer p {
  font-size: 0.9rem;
  line-height: 1.75;
}

.faq-answer a {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ===== Related Topics ===== */
.related-topics {
  padding-top: 32px;
  border-top: 2px solid var(--color-border);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.related-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition);
  text-decoration: none;
}

.related-card:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  transform: translateY(-2px);
}

.related-card i {
  color: var(--color-primary);
  font-size: 1rem;
  flex-shrink: 0;
}

/* ===== Sources Section ===== */
.sources-section {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
}

.sources-section h2 {
  font-size: 1.2rem;
  border-bottom-width: 2px;
  margin-bottom: 16px;
  padding-bottom: 10px;
}

.sources-section ul {
  list-style: none;
  padding-left: 0;
}

.sources-section li {
  padding: 6px 0;
  font-size: 0.88rem;
  position: relative;
  padding-left: 20px;
}

.sources-section li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.sources-note {
  font-size: 0.82rem;
  font-style: italic;
  color: var(--color-text-light);
  margin-top: 12px;
  margin-bottom: 0;
}

/* ===== Author Box ===== */
.author-box {
  display: flex;
  gap: 20px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 32px;
  box-shadow: var(--shadow-sm);
}

.author-avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.author-avatar i {
  font-size: 1.5rem;
  color: white;
}

.author-info h3 {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 0;
  margin-bottom: 4px;
}

.author-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px !important;
}

.author-info p:last-child {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.75);
  padding: 48px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 36px;
  padding-bottom: 36px;
}

.footer-col h4 {
  color: white;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col h4 i {
  color: var(--color-accent);
  margin-right: 6px;
}

.footer-col p {
  font-size: 0.85rem;
  line-height: 1.65;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-col a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

.footer-bottom a {
  color: rgba(255,255,255,0.6);
}

.footer-bottom a:hover {
  color: white;
}

/* ===== Security Notice ===== */
.security-notice {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-primary-dark);
  color: white;
  padding: 14px 20px;
  z-index: 200;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
  transform: translateY(100%);
  transition: transform 0.5s ease;
}

.security-notice.visible {
  transform: translateY(0);
}

.security-notice.hidden {
  transform: translateY(100%);
}

.security-content {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.security-content > i {
  color: var(--color-accent);
  font-size: 1.3rem;
  flex-shrink: 0;
}

.security-content p {
  font-size: 0.82rem;
  line-height: 1.5;
  flex: 1;
  margin: 0;
}

.security-close {
  background: rgba(255,255,255,0.15);
  border: none;
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: var(--transition);
}

.security-close:hover {
  background: rgba(255,255,255,0.3);
}

/* ===== Copy Success Toast ===== */
.copy-toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-success);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 300;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.copy-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Responsive Design ===== */

/* Tablet */
@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .article-content {
    max-width: 100%;
  }
}

/* Mobile */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 64px;
  }

  body {
    font-size: 15px;
  }

  .main-nav {
    display: none;
  }

  .main-nav.open {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 20px;
    gap: 12px;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }

  .mobile-menu-btn {
    display: block;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .article-content h2 {
    font-size: 1.3rem;
  }

  .quick-links {
    grid-template-columns: 1fr;
  }

  .quick-link-btn {
    padding: 10px 14px;
    font-size: 0.84rem;
  }

  .sample-header {
    padding: 18px 20px 14px;
  }

  .letter-content {
    padding: 18px 16px;
    font-size: 0.76rem;
  }

  .copy-btn {
    position: relative;
    top: 0;
    right: 0;
    margin: 12px 16px 0;
    width: calc(100% - 32px);
    justify-content: center;
  }

  .step-item {
    flex-direction: column;
    gap: 10px;
  }

  .step-item:not(:last-child)::after {
    display: none;
  }

  .format-item {
    flex-direction: column;
    gap: 12px;
  }

  .comparison-table {
    font-size: 0.78rem;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 8px 10px;
  }

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

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

  .author-box {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .article-meta {
    flex-direction: column;
    gap: 8px;
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .mistake-item {
    gap: 12px;
  }

  .security-content {
    flex-wrap: wrap;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }

  .article-header h1 {
    font-size: 1.3rem;
  }

  .quick-action-box {
    padding: 20px;
  }

  .info-card {
    padding: 20px;
  }

  .letter-content {
    font-size: 0.72rem;
    padding: 14px 12px;
  }

  .faq-question {
    padding: 14px 16px;
  }

  .faq-question span {
    font-size: 0.88rem;
  }

  .faq-item.open .faq-answer {
    padding: 0 16px 16px;
  }
}

/* ===== Print Styles ===== */
@media print {
  .disclaimer-banner,
  .site-header,
  .breadcrumb-bar,
  .sidebar,
  .quick-action-box,
  .copy-btn,
  .site-footer,
  .security-notice,
  .related-topics,
  .main-nav {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: black;
    background: white;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .article-content {
    max-width: 100%;
  }

  .letter-content {
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  .sample-letter-card {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  a[href^="#"]::after {
    content: "";
  }
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.article-content section {
  animation: fadeIn 0.4s ease both;
}

/* Scrollbar styling */
.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-light);
}

/* Selection styling */
::selection {
  background: var(--color-primary);
  color: white;
}