@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;600&display=swap');

:root {
  --ibm-blue: #0f62fe;
  --ibm-blue-60: #0043ce;
  --ibm-blue-80: #002d9c;
  --ink: #161616;
  --ink-muted: #525252;
  --ink-subtle: #8c8c8c;
  --canvas: #ffffff;
  --surface-1: #f4f4f4;
  --surface-2: #e0e0e0;
  --hairline: #e0e0e0;
  --hairline-strong: #161616;
  --inverse-canvas: #161616;
  --inverse-ink: #ffffff;
  --inverse-ink-muted: #c6c6c6;
  --success: #24a148;
  --warning: #f1c21b;
  --error: #da1e28;
  --nav-height: 48px;
  --utility-height: 32px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.16px;
  color: var(--ink);
  background: var(--canvas);
}

a { color: var(--ibm-blue); }
a:hover { color: var(--ibm-blue-60); }

.utility-bar {
  background: var(--surface-1);
  height: var(--utility-height);
  display: flex;
  align-items: center;
  padding: 0 32px;
}

.utility-bar-inner {
  width: 100%;
  max-width: 1312px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
}

.utility-link {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-muted);
  text-decoration: none;
}

.utility-link:hover { color: var(--ink); }

.top-nav {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  height: var(--nav-height);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0 32px;
}

.top-nav-inner {
  width: 100%;
  max-width: 1312px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  text-decoration: none;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0;
  flex-shrink: 0;
}

.nav-logo .accent { color: var(--ibm-blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 0 16px;
  height: var(--nav-height);
  line-height: var(--nav-height);
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}

.nav-links a:hover { border-bottom-color: var(--ibm-blue); color: var(--ibm-blue); }
.nav-links a.active { border-bottom-color: var(--ibm-blue); color: var(--ibm-blue); font-weight: 600; }

.nav-cta { margin-left: auto; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--ibm-blue);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.16px;
  font-family: inherit;
  text-decoration: none;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s;
  line-height: 1.29;
}

.btn-primary:hover { background: var(--ibm-blue-60); color: #fff; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--ink);
  color: var(--inverse-ink);
  font-size: 14px;
  letter-spacing: 0.16px;
  font-family: inherit;
  text-decoration: none;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s;
  line-height: 1.29;
}

.btn-tertiary {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--canvas);
  color: var(--ibm-blue);
  font-size: 14px;
  font-family: inherit;
  text-decoration: none;
  border: 1px solid var(--ibm-blue);
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s;
  line-height: 1.29;
}

.btn-tertiary:hover { background: rgba(15,98,254,0.06); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: calc(var(--nav-height) + var(--utility-height));
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--canvas);
  z-index: 99;
  overflow-y: auto;
  padding: 16px;
  border-top: 1px solid var(--hairline);
}

.mobile-drawer.open { display: block; }

.hybrid-layout {
  max-width: 1312px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  min-height: calc(100vh - var(--nav-height) - var(--utility-height));
}

.sidebar {
  border-right: 1px solid var(--hairline);
  padding: 32px 0;
  position: sticky;
  top: calc(var(--nav-height) + var(--utility-height));
  height: calc(100vh - var(--nav-height) - var(--utility-height));
  overflow-y: auto;
}

.sidebar-group { margin-bottom: 8px; }

.sidebar-group-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16px;
  color: var(--ink);
  padding: 12px 16px 4px;
  border-top: 1px solid var(--hairline);
  margin-top: 8px;
}

.sidebar-group:first-child .sidebar-group-title { border-top: none; margin-top: 0; }

.sidebar-link {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ink-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
}

.sidebar-link:hover { color: var(--ink); background: var(--surface-1); }
.sidebar-link.active { color: var(--ibm-blue); border-left-color: var(--ibm-blue); background: rgba(15,98,254,0.05); font-weight: 600; }

.main-content {
  padding: 32px 0;
  min-width: 0;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumbs a { color: var(--ibm-blue); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.breadcrumbs .sep { color: var(--ink-subtle); }
.breadcrumbs .current { color: var(--ink-muted); }

.page-eyebrow {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ibm-blue);
  margin-bottom: 12px;
}

.page-title {
  font-size: 42px;
  font-weight: 300;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 16px;
}

.page-lead {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  margin-bottom: 32px;
  max-width: 720px;
}

.content-body h2 {
  font-size: 32px;
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
  margin: 48px 0 16px;
  padding-top: 48px;
  border-top: 1px solid var(--hairline);
}

.content-body h3 {
  font-size: 24px;
  font-weight: 400;
  line-height: 1.33;
  color: var(--ink);
  margin: 32px 0 12px;
}

.content-body h4 {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  margin: 24px 0 8px;
}

.content-body p {
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 16px;
}

.content-body ul, .content-body ol {
  margin-left: 32px;
  margin-bottom: 16px;
}

.content-body li {
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 6px;
}

.content-body a { color: var(--ibm-blue); }

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-size: 14px;
}

.content-body th {
  text-align: left;
  padding: 12px 16px;
  background: var(--surface-1);
  color: var(--ink);
  font-weight: 600;
  border-bottom: 1px solid var(--hairline-strong);
  letter-spacing: 0.16px;
}

.content-body td {
  padding: 12px 16px;
  color: var(--ink);
  border-bottom: 1px solid var(--hairline);
  letter-spacing: 0.16px;
}

.content-body tr:nth-child(even) td { background: var(--surface-1); }

.disclaimer-notice {
  background: var(--surface-1);
  border-left: 4px solid var(--ibm-blue);
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ink-muted);
  line-height: 1.5;
}

.disclaimer-notice strong {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.32px;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 4px;
}

.feature-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 24px;
  margin-bottom: 1px;
}

.feature-card-elevated {
  background: var(--surface-1);
  padding: 24px;
  margin-bottom: 1px;
}

.toc-box {
  background: var(--surface-1);
  padding: 24px;
  margin-bottom: 32px;
}

.toc-box h4 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 12px;
}

.toc-box ol {
  margin-left: 20px;
}

.toc-box li {
  font-size: 14px;
  letter-spacing: 0.16px;
  margin-bottom: 4px;
}

.toc-box a { color: var(--ibm-blue); text-decoration: none; }
.toc-box a:hover { text-decoration: underline; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  margin-bottom: 32px;
}

.card-grid-item {
  background: var(--canvas);
  padding: 24px;
  text-decoration: none;
  display: block;
  transition: background 0.12s;
}

.card-grid-item:hover { background: var(--surface-1); }

.card-grid-item .card-eyebrow {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ibm-blue);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.card-grid-item .card-title {
  font-size: 20px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-grid-item .card-desc {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ink-muted);
  line-height: 1.5;
}

.related-section {
  border-top: 1px solid var(--hairline);
  padding-top: 32px;
  margin-top: 64px;
}

.related-section h2 {
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 16px;
  border: none;
  padding: 0;
  margin-top: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.related-item {
  background: var(--canvas);
  padding: 16px;
  text-decoration: none;
  display: block;
  transition: background 0.12s;
}

.related-item:hover { background: var(--surface-1); }

.related-item .rel-tag {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ibm-blue);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.related-item .rel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.16px;
  line-height: 1.3;
}

.hero-section {
  background: var(--canvas);
  padding: 96px 32px;
  border-bottom: 1px solid var(--hairline);
}

.hero-inner {
  max-width: 1312px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ibm-blue);
  margin-bottom: 16px;
}

.hero-title {
  font-size: 60px;
  font-weight: 300;
  line-height: 1.17;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  margin-bottom: 32px;
}

.hero-buttons { display: flex; gap: 2px; flex-wrap: wrap; }

.hero-image-placeholder {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image-placeholder img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.home-sections {
  max-width: 1312px;
  margin: 0 auto;
  padding: 64px 32px;
}

.section-eyebrow {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ibm-blue);
  margin-bottom: 8px;
}

.section-title {
  font-size: 42px;
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 18px;
  color: var(--ink-muted);
  margin-bottom: 48px;
  max-width: 640px;
}

.cta-band {
  background: var(--ibm-blue);
  padding: 48px 32px;
}

.cta-band-inner {
  max-width: 1312px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band h2 {
  font-size: 32px;
  font-weight: 400;
  color: #fff;
  flex: 1;
}

.btn-on-blue {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  background: #fff;
  color: var(--ibm-blue);
  font-size: 14px;
  letter-spacing: 0.16px;
  font-family: inherit;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: 0;
  cursor: pointer;
  flex-shrink: 0;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-size: 14px;
  border: 1px solid var(--hairline);
}

.comparison-table th {
  background: var(--ibm-blue);
  color: #fff;
  padding: 12px 16px;
  text-align: left;
  font-weight: 400;
  letter-spacing: 0.16px;
}

.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
  letter-spacing: 0.16px;
}

.comparison-table tr:nth-child(even) td { background: var(--surface-1); }

.site-footer {
  background: var(--inverse-canvas);
  color: var(--inverse-ink-muted);
  padding: 64px 32px;
}

.footer-inner {
  max-width: 1312px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--inverse-ink);
  margin-bottom: 16px;
  letter-spacing: 0;
}

.footer-brand p {
  font-size: 14px;
  letter-spacing: 0.16px;
  line-height: 1.5;
  margin-bottom: 10px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--inverse-ink);
  letter-spacing: 0.16px;
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }

.footer-col a {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--inverse-ink-muted);
  text-decoration: none;
}

.footer-col a:hover { color: var(--inverse-ink); }

.footer-bottom {
  max-width: 1312px;
  margin: 0 auto;
  padding-top: 32px;
  border-top: 1px solid #393939;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-disclaimer {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--inverse-ink-muted);
  line-height: 1.5;
  flex: 1;
  min-width: 200px;
}

.footer-copyright {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--inverse-ink-muted);
  white-space: nowrap;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--inverse-canvas);
  color: var(--inverse-ink);
  padding: 24px 32px;
  display: none;
  align-items: center;
  gap: 32px;
  border-top: 1px solid #393939;
  flex-wrap: wrap;
}

.cookie-banner.show { display: flex; }

.cookie-text {
  font-size: 14px;
  letter-spacing: 0.16px;
  line-height: 1.5;
  flex: 1;
  min-width: 200px;
}

.cookie-text a { color: var(--ibm-blue); }

.cookie-buttons { display: flex; gap: 2px; flex-shrink: 0; }

.cookie-btn-accept {
  padding: 12px 16px;
  background: var(--ibm-blue);
  color: #fff;
  border: none;
  border-radius: 0;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
}

.cookie-btn-reject {
  padding: 12px 16px;
  background: var(--inverse-canvas);
  color: var(--inverse-ink);
  border: 1px solid #393939;
  border-radius: 0;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
}

.form-group { margin-bottom: 24px; }

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  height: 48px;
  padding: 11px 16px;
  background: var(--surface-1);
  color: var(--ink);
  font-size: 16px;
  letter-spacing: 0.16px;
  font-family: inherit;
  border: none;
  border-bottom: 1px solid var(--ink);
  outline: none;
  transition: border-bottom-width 0.15s;
}

.form-input:focus { border-bottom: 2px solid var(--ibm-blue); }

textarea.form-input { height: auto; resize: vertical; }

.form-success {
  display: none;
  padding: 16px 20px;
  background: rgba(36, 161, 72, 0.1);
  border-left: 4px solid var(--success);
  font-size: 16px;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-top: 16px;
}

.contact-page-wrapper {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px 32px;
}

.page-wrapper {
  max-width: 1312px;
  margin: 0 auto;
  padding: 64px 32px;
}

@media (max-width: 1055px) {
  .hybrid-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main-content { padding: 32px 0; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-title { font-size: 42px; }
  .hero-image-placeholder { display: none; }
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 671px) {
  .hero-title { font-size: 32px; }
  .hero-section { padding: 64px 24px; }
  .home-sections { padding: 48px 24px; }
  .section-title { font-size: 28px; }
  .page-title { font-size: 28px; }
  .footer-inner { grid-template-columns: 1fr; }
  .site-footer { padding: 48px 24px; }
  .hybrid-layout { padding: 0 24px; }
  .contact-page-wrapper { padding: 48px 24px; }
  .utility-bar { display: none; }
  .top-nav { top: 0; }
  .cta-band { padding: 32px 24px; }
  .cta-band-inner { flex-direction: column; }
}