/* ==========================================================================
   悠兔 Youtu (youtu6.mom) 官方样式库
   Theme: Mint Rabbit Minimal｜薄荷兔极简风
   Design Tokens:
     - Main Background: #FAFCF9
     - Brand Green:     #20B89A
     - Dark Text:       #1D2932
     - Muted Text:      #66757D
     - Border Color:    #E2EAE5
     - Surface White:   #FFFFFF
   ========================================================================== */

:root {
  --bg-main: #FAFCF9;
  --bg-card: #FFFFFF;
  --brand-green: #20B89A;
  --brand-green-hover: #199E84;
  --brand-green-light: #EBF8F5;
  --brand-green-soft: rgba(32, 184, 154, 0.12);
  --text-dark: #1D2932;
  --text-muted: #66757D;
  --text-light: #94A3B8;
  --border-color: #E2EAE5;
  --border-focus: #20B89A;
  --badge-warning-bg: #FFF7ED;
  --badge-warning-border: #FFEDD5;
  --badge-warning-text: #C2410C;
  --badge-danger-bg: #FEF2F2;
  --badge-danger-border: #FEE2E2;
  --badge-danger-text: #B91C1C;
  --badge-neutral-bg: #F1F5F9;
  --badge-neutral-border: #E2E8F0;
  --badge-neutral-text: #475569;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-max: 1140px;
  --transition: all 0.2s ease-in-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-dark);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  color: var(--brand-green-hover);
}

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

ul, ol {
  padding-left: 1.25rem;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Section Common */
.section {
  padding: 4.5rem 0;
  position: relative;
}

.section-divider {
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 2.75rem;
  text-align: left;
}

.section-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--brand-green);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 680px;
  line-height: 1.6;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.2;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--brand-green);
  color: var(--brand-green);
  background-color: var(--brand-green-light);
}

.btn-sm {
  padding: 0.4375rem 0.875rem;
  font-size: 0.8125rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 252, 249, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  height: 4.25rem;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text-dark);
  font-weight: 700;
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand-logo-img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.brand-subtext {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

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

.nav-link {
  color: var(--text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition);
  padding: 0.25rem 0;
  position: relative;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--brand-green);
  border-radius: 1px;
}

/* Nav Register Button with Icon */
.nav-btn-register {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  background-color: var(--brand-green);
  color: #FFFFFF !important;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  line-height: 1.2;
}

.nav-btn-register:hover {
  background-color: var(--brand-green-hover);
  color: #FFFFFF !important;
  box-shadow: 0 3px 10px rgba(32, 184, 154, 0.25);
  transform: translateY(-1px);
}

.nav-btn-register svg {
  flex-shrink: 0;
  stroke: currentColor;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-dark);
}

.mobile-menu-toggle svg {
  display: block;
  width: 22px;
  height: 22px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  background: linear-gradient(180deg, rgba(235, 248, 245, 0.4) 0%, var(--bg-main) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3125rem 0.75rem;
  background-color: var(--brand-green-light);
  border: 1px solid rgba(32, 184, 154, 0.25);
  border-radius: 9999px;
  font-size: 0.8125rem;
  color: var(--brand-green);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--brand-green);
}

.hero-title {
  font-size: 2.375rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 0.875rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--brand-green);
  line-height: 1.4;
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 580px;
}

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

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-rabbit-illustration {
  width: 100%;
  max-width: 380px;
  height: auto;
  background-color: #FFFFFF;
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px -2px rgba(29, 41, 50, 0.03);
}

/* ==========================================================================
   Three Service Features (横向排列的文字栏目)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-item {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  transition: var(--transition);
  position: relative;
}

.feature-item:hover {
  border-color: var(--brand-green);
  box-shadow: 0 6px 16px -4px rgba(32, 184, 154, 0.08);
}

.feature-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: block;
}

.feature-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.625rem;
}

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

/* ==========================================================================
   Plans & Pricing Section
   ========================================================================== */
.pricing-notice {
  background-color: var(--brand-green-light);
  border: 1px solid rgba(32, 184, 154, 0.25);
  border-radius: var(--radius-md);
  padding: 1.125rem 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.9375rem;
  color: var(--text-dark);
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
}

.pricing-notice svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--brand-green);
  margin-top: 2px;
}

.plans-table-container {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.plans-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
  min-width: 720px;
}

.plans-table th {
  background-color: #F8FAF9;
  color: var(--text-muted);
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.plans-table td {
  padding: 1.125rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-dark);
  vertical-align: middle;
}

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

.plan-name-cell {
  font-weight: 600;
  color: var(--text-dark);
}

.plan-price-val {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--brand-green);
}

.plan-price-abnormal {
  color: var(--badge-danger-text);
  font-weight: 700;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}

.status-badge.reference {
  background-color: var(--brand-green-light);
  color: var(--brand-green);
  border: 1px solid rgba(32, 184, 154, 0.3);
}

.status-badge.conflict {
  background-color: var(--badge-danger-bg);
  color: var(--badge-danger-text);
  border: 1px solid var(--badge-danger-border);
}

.status-badge.unverified {
  background-color: var(--badge-warning-bg);
  color: var(--badge-warning-text);
  border: 1px solid var(--badge-warning-border);
}

.plan-meta-notes {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 0.25rem;
}

/* ==========================================================================
   Three-Step Usage Flow (三步使用流程)
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}

.step-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  position: relative;
}

.step-badge {
  width: 36px;
  height: 36px;
  background-color: var(--brand-green-light);
  border: 1px solid rgba(32, 184, 154, 0.25);
  color: var(--brand-green);
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.step-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.625rem;
}

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

/* ==========================================================================
   Six Knowledge Articles Section
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--brand-green);
  box-shadow: 0 4px 16px -2px rgba(32, 184, 154, 0.08);
}

.article-card-header {
  margin-bottom: 1rem;
}

.article-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-green);
  background-color: var(--brand-green-light);
  padding: 0.1875rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.article-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.45;
  margin-bottom: 0.625rem;
}

.article-card-title a {
  color: var(--text-dark);
  text-decoration: none;
}

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

.article-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8125rem;
  color: var(--text-light);
}

.article-read-btn {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--brand-green);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.article-read-btn:hover {
  color: var(--brand-green-hover);
  text-decoration: underline;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 860px;
}

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

.faq-item[open] {
  border-color: var(--brand-green);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--brand-green);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: 0.75rem;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-col-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
}

.footer-col-links a:hover {
  color: var(--brand-green);
}

.footer-bottom {
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-light);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-disclaimer {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 700px;
}

/* ==========================================================================
   Article Detail Page Styles
   ========================================================================== */
.article-page-header {
  padding: 3.5rem 0 2rem;
  background: linear-gradient(180deg, rgba(235, 248, 245, 0.4) 0%, var(--bg-main) 100%);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

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

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

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

.article-title {
  font-size: 2.125rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.article-body-container {
  padding: 3.5rem 0;
  max-width: 820px;
  margin: 0 auto;
}

.article-content {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: #2D3748;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-dark);
  margin: 2.75rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-dark);
  margin: 1.75rem 0 0.75rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

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

.article-callout {
  background-color: #FFFFFF;
  border-left: 4px solid var(--brand-green);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.article-callout-warning {
  border-left-color: #E05656;
  background-color: #FFF9F9;
}

.article-callout-title {
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.375rem;
  font-size: 1rem;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 1.75rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #FFFFFF;
}

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

.article-table th {
  background-color: #F8FAF9;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
}

.article-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-dark);
}

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

/* Related Articles Box */
.related-box {
  margin-top: 3.5rem;
  padding: 2rem;
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.related-box-title {
  font-size: 1.1875rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.related-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.related-list li a {
  color: var(--text-dark);
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.related-list li a:hover {
  color: var(--brand-green);
}

/* Article Bottom CTA Box (立即订阅) */
.article-cta-box {
  margin-top: 2rem;
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  box-shadow: 0 4px 16px -2px rgba(32, 184, 154, 0.06);
  transition: var(--transition);
}

.article-cta-box:hover {
  border-color: var(--brand-green);
}

.article-cta-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.25rem;
}

.article-cta-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-cta-btn {
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
}

/* Modal for Unconfigured Entries */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(29, 41, 50, 0.45);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 2rem;
  max-width: 440px;
  width: 100%;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px -5px rgba(29, 41, 50, 0.1);
  text-align: center;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--brand-green-light);
  color: var(--brand-green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
}

.modal-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .hero-visual {
    order: -1;
    max-width: 320px;
    margin: 0 auto;
  }
  
  .features-grid,
  .steps-grid,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 4.25rem;
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
    align-items: flex-start;
    gap: 1rem;
  }
  
  .nav-links.show {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-btn-register {
    width: 100%;
    justify-content: center;
    padding: 0.625rem 1rem;
    margin-top: 0.5rem;
  }
  
  .features-grid,
  .steps-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 1.875rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .article-cta-box {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    padding: 1.5rem;
  }
  
  .article-cta-btn {
    width: 100%;
  }
}

@media (max-width: 390px) {
  .hero-title {
    font-size: 1.625rem;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
}

/* Accessibility: 尊重用户系统的减少动画偏好，提升低性能设备流畅度 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}