/* ==========================================================================
   奈云 NaiYun (naiyun.shop) - 电光蓝极简编辑风 Design System
   UI Specification:
   - Primary BG: #FFFFFF
   - Secondary BG: #F5F7FC
   - Brand Blue: #2455F4
   - Brand Blue Hover: #1742d4
   - Dark Text: #111827
   - Muted Text: #667085
   - Border Color: #E5EAF2
   - Editorial Aesthetic: Clean hairline rules, bold typography, generous whitespace
   ========================================================================== */

:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F7FC;
  --bg-accent: #EEF2FF;
  --color-brand: #2455F4;
  --color-brand-hover: #1942D8;
  --color-brand-light: #F0F4FF;
  --text-primary: #111827;
  --text-secondary: #667085;
  --text-muted: #9CA3AF;
  --border-color: #E5EAF2;
  --border-dark: #D1D9E7;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --container-max: 1160px;
  --container-pad: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: border-color 0.2s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo-wrap {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-brand);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-brand);
}

.nav-link.active {
  color: var(--color-brand);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

@media (max-width: 640px) {
  .nav-actions {
    gap: 8px;
  }
  .nav-actions .btn {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }
}

.mobile-menu-btn {
  display: none;
  padding: 8px;
  color: var(--text-primary);
  background: transparent;
  border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  white-space: nowrap;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-brand);
  color: #FFFFFF;
  border: 1px solid var(--color-brand);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.btn-pending {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 8px 16px;
}

.btn-pending:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

/* Hero Section */
.hero-section {
  padding: 84px 0 72px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-brand);
  background-color: var(--color-brand-light);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: 3.125rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-brand);
  line-height: 1.4;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-intro {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.hero-svg-graphic {
  width: 100%;
  height: auto;
  max-width: 440px;
}

/* Section Header Component */
.section-header {
  margin-bottom: 48px;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-brand);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.125rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 680px;
}

/* Section 1: Core Features */
.features-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.feature-module {
  border-top: 2px solid var(--border-color);
  padding-top: 24px;
  transition: border-color 0.2s ease;
}

.feature-module:hover {
  border-top-color: var(--color-brand);
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-brand);
  margin-bottom: 16px;
  display: block;
  letter-spacing: 0.05em;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.feature-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Section 2: Pricing Plans */
.pricing-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.pricing-notice-box {
  background-color: var(--bg-primary);
  border-left: 3px solid var(--color-brand);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 20px;
  margin-bottom: 32px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.pricing-notice-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.pricing-notice-text strong {
  color: var(--text-primary);
}

.pricing-bars-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pricing-row {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 32px;
  display: grid;
  grid-template-columns: 180px 140px 180px 1fr 160px;
  align-items: center;
  gap: 24px;
  transition: all 0.2s ease;
}

.pricing-row:hover {
  border-color: var(--color-brand);
  box-shadow: 0 4px 12px rgba(36, 85, 244, 0.06);
}

.plan-col-name {
  display: flex;
  flex-direction: column;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.plan-badge-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-brand);
  background-color: var(--color-brand-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  width: fit-content;
}

.plan-col-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.plan-price-period {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.plan-col-traffic {
  display: flex;
  flex-direction: column;
}

.plan-traffic-val {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
}

.plan-traffic-cycle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.plan-col-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.plan-route-spec {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.plan-device-spec {
  color: var(--text-muted);
}

.plan-col-action {
  text-align: right;
}

/* Section 3: Workflow */
.workflow-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.workflow-step {
  border-top: 2px solid var(--color-brand);
  padding-top: 28px;
  background-color: var(--bg-secondary);
  padding: 32px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  border-top: 3px solid var(--color-brand);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-brand);
  margin-bottom: 16px;
  display: block;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.step-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Section 4: Articles Editorial List */
.articles-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.articles-editorial-list {
  display: flex;
  flex-direction: column;
}

.article-item-row {
  display: grid;
  grid-template-columns: 80px 1fr 140px;
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--border-color);
  align-items: baseline;
  transition: background-color 0.15s ease;
}

.article-item-row:last-child {
  border-bottom: 1px solid var(--border-color);
}

.article-row-index {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-muted);
}

.article-row-content {
  max-width: 780px;
}

.article-row-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.article-tag {
  color: var(--color-brand);
  font-weight: 600;
  background-color: var(--color-brand-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.article-row-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-row-title a {
  color: inherit;
}

.article-row-title a:hover {
  color: var(--color-brand);
}

.article-row-summary {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.article-row-cta {
  text-align: right;
}

.article-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-brand);
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  transition: all 0.2s ease;
}

.article-read-btn:hover {
  border-color: var(--color-brand);
  background-color: var(--color-brand);
  color: #FFFFFF;
}

/* Section 5: FAQ Section */
.faq-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.faq-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px;
}

.faq-question {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.faq-q-mark {
  color: var(--color-brand);
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
}

.faq-answer {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Section 6: About & Footer */
.site-footer {
  background-color: #0F172A;
  color: #94A3B8;
  padding: 64px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo-row {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.footer-brand-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #94A3B8;
}

.footer-col-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  font-size: 0.875rem;
  color: #94A3B8;
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: #FFFFFF;
}

.footer-contact-notice {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: #64748B;
  background-color: rgba(255, 255, 255, 0.04);
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

.footer-legal-links a:hover {
  color: #CBD5E1;
}

/* Modal Styling */
.ny-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.ny-modal-backdrop.is-visible {
  display: flex;
}

.ny-modal-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-width: 500px;
  width: 100%;
  padding: 32px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.ny-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.ny-modal-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-brand-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ny-modal-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-primary);
}

.ny-modal-body p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.ny-modal-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #B45309;
  background-color: #FEF3C7;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #F59E0B;
}

.ny-modal-footer {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
}

.ny-modal-btn {
  background-color: var(--color-brand);
  color: #FFFFFF;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background-color 0.2s ease;
}

.ny-modal-btn:hover {
  background-color: var(--color-brand-hover);
}

/* ==========================================================================
   Article Detail Page Typography & Layout
   ========================================================================== */
.article-header {
  padding: 56px 0 36px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

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

.article-breadcrumb-sep {
  color: var(--text-muted);
}

.article-h1 {
  font-size: 2.375rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px var(--container-pad) 80px;
}

/* Editorial Body Typography */
.article-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: #1F2937;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body h2 {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.015em;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-top: 32px;
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-callout {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--color-brand);
  padding: 20px 24px;
  margin: 32px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-callout p:last-child {
  margin-bottom: 0;
}

.article-callout-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  font-size: 1rem;
}

/* Article Table Styling */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 32px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  text-align: left;
}

.article-table th {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 700;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  line-height: 1.6;
}

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

.article-table tr:hover td {
  background-color: #F8FAFC;
}

/* Code block or preformatted table */
.article-body pre {
  background-color: #0F172A;
  color: #E2E8F0;
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  margin: 28px 0;
}

.article-faq-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  margin-bottom: 20px;
}

.article-faq-q {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-faq-a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.article-faq-a p:last-child {
  margin-bottom: 0;
}

.article-footer-nav {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* Article CTA Button: 用户注册购买中心 */
.article-cta-wrap {
  margin: 40px 0 24px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.article-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  padding: 13px 32px;
  background-color: var(--color-brand);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-brand);
  box-shadow: 0 4px 14px rgba(36, 85, 244, 0.18);
  transition: all 0.2s ease;
  text-decoration: none;
}

.article-cta-btn:hover {
  background-color: var(--color-brand-hover);
  border-color: var(--color-brand-hover);
  box-shadow: 0 6px 20px rgba(36, 85, 244, 0.28);
  transform: translateY(-1px);
  color: #FFFFFF;
}

@media (max-width: 480px) {
  .article-cta-btn {
    width: 100%;
    padding: 12px 20px;
    font-size: 1rem;
  }
}

/* ==========================================================================
   Responsive Breakpoints: 1024px, 768px, 390px, 375px
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .pricing-row {
    grid-template-columns: 140px 120px 140px 1fr 140px;
    gap: 16px;
    padding: 20px 24px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 24px;
    gap: 16px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 2.125rem;
  }

  .features-grid, .workflow-grid, .faq-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .pricing-row {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

  .plan-col-action {
    text-align: left;
  }

  .article-item-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .article-row-index {
    display: none;
  }

  .article-row-cta {
    text-align: left;
    margin-top: 8px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .article-h1 {
    font-size: 1.875rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 1.0625rem;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .section-title {
    font-size: 1.625rem;
  }
}