/* Modern Calm Lake-Blue Data Journal Theme */
:root {
  --bg-icy: #F0F7F8;
  --bg-card: #FFFFFF;
  --bg-alt: #E6F2F4;
  --bg-dark: #164F5B;
  --text-primary: #233439;
  --text-secondary: #4A636A;
  --text-muted: #708A91;
  --text-light: #F0F7F8;
  
  --color-teal: #164F5B;
  --color-lake: #73AEB7;
  --color-lake-light: #A3D2D9;
  --color-dark: #233439;
  --color-border: #C8E0E5;
  --color-border-dark: #2B6875;
  --color-accent: #0E3841;
  --color-badge: #E0EFF2;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --shadow-sm: 0 2px 6px rgba(22, 79, 91, 0.05);
  --shadow-md: 0 6px 16px rgba(22, 79, 91, 0.08);
  --shadow-lg: 0 12px 32px rgba(22, 79, 91, 0.12);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-icy);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

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

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--color-lake);
  outline-offset: 2px;
}

a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
.site-header {
  background-color: rgba(240, 247, 248, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 70px;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-teal);
  letter-spacing: -0.5px;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-teal);
  color: #fff;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-teal);
  border-bottom-color: var(--color-lake);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-teal);
  color: #FFFFFF !important;
}

.btn-primary:hover {
  background-color: var(--color-accent);
  color: #FFFFFF !important;
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-teal);
  border-color: var(--color-border-dark);
}

.btn-secondary:hover {
  background-color: var(--color-badge);
  color: var(--color-accent);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.875rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-teal);
}

.mobile-toggle svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* Hero Section */
.hero-section {
  padding: 60px 0 80px;
  position: relative;
  background: linear-gradient(180deg, var(--bg-icy) 0%, #E2EFF1 100%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 50px;
  line-height: 1.15;
  font-weight: 800;
  color: var(--color-teal);
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-copy .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  border-top: 1px dashed var(--color-border-dark);
  padding-top: 16px;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Dashboard Report Mockup */
.dashboard-card {
  background: var(--color-teal);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border-dark);
  position: relative;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(200, 224, 229, 0.2);
  padding-bottom: 14px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.dashboard-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-lake-light);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #4EEDC4;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px #4EEDC4;
}

.node-report-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-report-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.2rem;
}

.node-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.node-specs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-lake-light);
  background: rgba(115, 174, 183, 0.15);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.dashboard-footer-note {
  margin-top: 18px;
  font-size: 0.75rem;
  color: rgba(240, 247, 248, 0.7);
  font-family: var(--font-mono);
  line-height: 1.4;
  border-top: 1px dashed rgba(255, 255, 255, 0.15);
  padding-top: 12px;
}

/* Motion Waveform Background */
.waveform-container {
  width: 100%;
  height: 40px;
  overflow: hidden;
  position: absolute;
  bottom: 0;
  left: 0;
  opacity: 0.25;
  pointer-events: none;
}

.waveform-svg {
  width: 200%;
  height: 100%;
  animation: waveMotion 16s linear infinite;
}

@keyframes waveMotion {
  0% { transform: translateX(0); }
  50% { transform: translateX(-25%); }
  100% { transform: translateX(-50%); }
}

/* Sections Base */
.section {
  padding: 70px 0;
}

.section-alt {
  background-color: #FFFFFF;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-lake);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  color: var(--color-teal);
  font-weight: 700;
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Editorial Divider */
.editorial-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 40px 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.editorial-divider::before, .editorial-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

/* Grid Components */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-lake);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-icy);
  color: var(--color-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 12px;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Scenario Block */
.scenario-block {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 30px;
}

.scenario-header-bar {
  background: var(--bg-icy);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.scenario-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--color-teal);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.scenario-body {
  padding: 28px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.tag-item {
  background: var(--bg-icy);
  border: 1px solid var(--color-border);
  color: var(--color-teal);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  font-family: var(--font-mono);
}

/* Clean Data Tables */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #FFFFFF;
  margin-bottom: 24px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.data-table th {
  background: var(--bg-icy);
  color: var(--color-teal);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 2px solid var(--color-border);
  font-family: var(--font-sans);
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--text-primary);
}

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

.data-table tr:nth-child(even) {
  background-color: rgba(240, 247, 248, 0.4);
}

/* Pricing Cards */
.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--color-teal);
  box-shadow: var(--shadow-md);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-teal);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 12px;
  font-family: var(--font-mono);
}

.pricing-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-teal);
  margin: 12px 0 6px;
  font-family: var(--font-mono);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.pricing-price .currency {
  font-size: 1.25rem;
  font-weight: 600;
}

.pricing-price .period {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.pricing-spec {
  display: inline-block;
  background: var(--bg-icy);
  color: var(--color-teal);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
}

.pricing-placeholder-tag {
  display: inline-block;
  background: var(--color-badge);
  color: var(--color-teal);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.pricing-features {
  list-style: none;
  margin: 20px 0 28px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: "✓";
  color: var(--color-lake);
  font-weight: bold;
}

/* Article Cards Grid (3 cols desktop / 2 tablet / 1 mobile) */
.article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-lake);
}

.article-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-lake);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 10px;
  line-height: 1.35;
}

.article-card-title a {
  color: var(--color-teal);
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  font-family: var(--font-mono);
}

/* Testimonials */
.testimonial-card {
  background: var(--bg-icy);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.testimonial-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-border-dark);
  color: #fff;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 12px;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-style: italic;
  margin-bottom: 16px;
  line-height: 1.6;
}

.testimonial-author {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-teal);
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-teal);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.2s ease;
}

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

.faq-item summary:hover {
  background: var(--bg-icy);
}

.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-lake);
  transition: transform 0.2s ease;
}

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

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px dashed var(--color-border);
  margin-top: -6px;
  padding-top: 16px;
}

/* Article Detail Pages */
.article-detail-header {
  padding: 40px 0 30px;
  background: var(--bg-icy);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

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

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

.breadcrumb-separator {
  color: var(--color-border-dark);
}

.article-title-h1 {
  font-size: 2.25rem;
  line-height: 1.25;
  color: var(--color-teal);
  font-weight: 800;
  margin-bottom: 16px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.article-content-layout {
  padding: 50px 0 70px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 1.6rem;
  color: var(--color-teal);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--color-teal);
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body blockquote {
  border-left: 4px solid var(--color-lake);
  background: var(--bg-icy);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.sidebar-widget {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-widget-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-teal);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.related-article-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-article-list a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  display: block;
}

.related-article-list a:hover {
  color: var(--color-lake);
}

/* Code Snippets */
pre, code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

pre {
  background: var(--color-dark);
  color: var(--bg-icy);
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 20px 0;
}

code:not(pre code) {
  background: var(--bg-icy);
  color: var(--color-teal);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* Footer */
.site-footer {
  background: var(--color-dark);
  color: var(--text-light);
  padding: 60px 0 30px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 1.05rem;
  color: #FFFFFF;
  margin-bottom: 18px;
  font-weight: 700;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.footer-links a {
  color: rgba(240, 247, 248, 0.75);
}

.footer-links a:hover {
  color: var(--color-lake-light);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(240, 247, 248, 0.6);
  font-family: var(--font-mono);
}

/* Responsive Media Queries */
@media (max-width: 1023px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-content-layout {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    opacity: 0;
    visibility: hidden;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .hero-copy h1 {
    font-size: 34px;
  }
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .header-cta .btn-secondary {
    display: none;
  }
}

/* Reduced Motion Override */
@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;
  }
  .waveform-svg {
    animation: none;
  }
}