/* IBM ATOM - IBM Design Language Compliant CSS */

:root {
  /* IBM Design Language - Blue Color Palette */
  --ibm-blue-60: #0f62fe;
  --ibm-blue-70: #0043ce;
  --ibm-blue-80: #002d9c;
  --ibm-blue-50: #4589ff;
  --ibm-blue-40: #78a9ff;
  
  /* IBM Design Language - Gray Scale */
  --ibm-gray-100: #161616;
  --ibm-gray-90: #262626;
  --ibm-gray-80: #393939;
  --ibm-gray-70: #525252;
  --ibm-gray-60: #6f6f6f;
  --ibm-gray-50: #8d8d8d;
  --ibm-gray-40: #a8a8a8;
  --ibm-gray-30: #c6c6c6;
  --ibm-gray-20: #e0e0e0;
  --ibm-gray-10: #f4f4f4;
  --ibm-white: #ffffff;
  
  /* IBM Design Language - Spacing Scale */
  --spacing-01: 0.125rem;
  --spacing-02: 0.25rem;
  --spacing-03: 0.5rem;
  --spacing-04: 0.75rem;
  --spacing-05: 1rem;
  --spacing-06: 1.5rem;
  --spacing-07: 2rem;
  --spacing-08: 2.5rem;
  --spacing-09: 3rem;
  --spacing-10: 4rem;
  --spacing-11: 5rem;
  --spacing-12: 6rem;
  
  /* IBM Design Language - Layout */
  --layout-01: 1rem;
  --layout-02: 1.5rem;
  --layout-03: 2rem;
  --layout-04: 3rem;
  --layout-05: 4rem;
  --layout-06: 6rem;
  --layout-07: 10rem;
  
  /* IBM Design Language - Shadows */
  --shadow-01: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-02: 0 2px 6px 0 rgba(0, 0, 0, 0.2);
  
  /* IBM Design Language - Motion */
  --transition-fast: 110ms cubic-bezier(0.2, 0, 0.38, 0.9);
  --transition-moderate: 240ms cubic-bezier(0.2, 0, 0.38, 0.9);
  --transition-slow: 400ms cubic-bezier(0.2, 0, 0.38, 0.9);
}

/* Light Theme Variables - IBM Carbon White Theme */
[data-theme="light"] {
  --background: var(--ibm-white);
  --background-hover: var(--ibm-gray-10);
  --layer-01: var(--ibm-gray-10);
  --layer-02: var(--ibm-white);
  --layer-03: var(--ibm-gray-10);
  --field-01: var(--ibm-gray-10);
  --field-02: var(--ibm-white);
  --border-subtle: var(--ibm-gray-20);
  --border-strong: var(--ibm-gray-50);
  --text-primary: var(--ibm-gray-100);
  --text-secondary: var(--ibm-gray-70);
  --text-placeholder: var(--ibm-gray-40);
  --text-on-color: var(--ibm-white);
  --link-primary: var(--ibm-blue-60);
  --link-primary-hover: var(--ibm-blue-70);
  --interactive: var(--ibm-blue-60);
  --focus: var(--ibm-blue-60);
  --inverse-01: var(--ibm-white);
  --inverse-02: var(--ibm-gray-80);
}

/* Dark Theme Variables - IBM Carbon Gray 100 Theme */
[data-theme="dark"] {
  --background: var(--ibm-gray-100);
  --background-hover: var(--ibm-gray-90);
  --layer-01: var(--ibm-gray-90);
  --layer-02: var(--ibm-gray-80);
  --layer-03: var(--ibm-gray-70);
  --field-01: var(--ibm-gray-90);
  --field-02: var(--ibm-gray-80);
  --border-subtle: var(--ibm-gray-80);
  --border-strong: var(--ibm-gray-60);
  --text-primary: var(--ibm-gray-10);
  --text-secondary: var(--ibm-gray-30);
  --text-placeholder: var(--ibm-gray-60);
  --text-on-color: var(--ibm-white);
  --link-primary: var(--ibm-blue-40);
  --link-primary-hover: var(--ibm-blue-50);
  --interactive: var(--ibm-blue-60);
  --focus: var(--ibm-blue-40);
  --inverse-01: var(--ibm-gray-100);
  --inverse-02: var(--ibm-gray-10);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
  font-size: 1rem;
  font-weight: 400;
}

/* Theme Toggle Button */
.theme-toggle {
  background: var(--layer-01);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  color: var(--text-primary);
  font-size: 1.25rem;
}

.theme-toggle:hover {
  background: var(--interactive);
  border-color: var(--interactive);
}

.theme-toggle:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Modern Navigation */
.modern-nav {
  background: var(--layer-01);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 8000;
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-01);
}

.nav-container {
  max-width: 99rem;
  margin: 0 auto;
  padding: var(--spacing-05) var(--layout-03);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-05);
  min-height: 3.75rem;
}

.logo-link {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.logo-img {
  height: 40px;
  width: auto;
  transition: opacity var(--transition-fast);
}

.logo-img:hover {
  opacity: 0.8;
}

[data-theme="light"] .logo-img {
  filter: brightness(0) saturate(100%);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-05);
  flex-wrap: wrap;
}

/* Burger Menu */
.burger-menu {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 48px;
  height: 48px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-03);
  z-index: 8001;
  position: relative;
}

.burger-line {
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-moderate);
  transform-origin: center;
}

.burger-menu:hover .burger-line {
  background: var(--interactive);
}

.burger-menu:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Burger menu animation when active */
.burger-menu.active .burger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.burger-menu.active .burger-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.burger-menu.active .burger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.fedramp-badge {
  background: transparent;
  color: var(--text-primary);
  padding: var(--spacing-03) var(--spacing-06);
  border-radius: 0;
  border: 1px solid var(--text-primary);
  font-size: 0.875rem;
  font-weight: 400;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  display: inline-block;
  line-height: 1.29;
}

.fedramp-badge:hover {
  background: var(--background-hover);
}

.demo-btn {
  background: var(--interactive);
  color: var(--text-on-color);
  padding: var(--spacing-03) var(--spacing-06);
  border-radius: 0;
  border: none;
  font-size: 0.875rem;
  font-weight: 400;
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
  display: inline-block;
  white-space: nowrap;
  line-height: 1.29;
}

.demo-btn:hover {
  background: var(--link-primary-hover);
}

.demo-btn:focus {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, rgba(15, 98, 254, 0.1) 0%, var(--background) 100%),
              url('_next/static/media/IBM-Watson-Cloud-Services.749656d7.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  padding: var(--layout-05) var(--layout-03) var(--layout-06);
  text-align: center;
  margin-top: 3.75rem;
}

.hero-content {
  max-width: 82rem;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.625rem, 5vw, 4.25rem);
  font-weight: 300;
  line-height: 1.25;
  margin-bottom: var(--spacing-07);
  color: #FFFFFF;
  letter-spacing: 0;
  text-shadow:
    -1px -1px 0 #000,
    1px -1px 0 #000,
    -1px 1px 0 #000,
    1px 1px 0 #000,
    0 0 8px rgba(0, 0, 0, 0.8);
}

[data-theme="light"] .hero-title {
  color: #FFFFFF;
  text-shadow:
    -1px -1px 0 #000,
    1px -1px 0 #000,
    -1px 1px 0 #000,
    1px 1px 0 #000,
    0 0 8px rgba(0, 0, 0, 0.8);
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 66rem;
  margin: 0 auto;
  background: var(--layer-01);
  padding: var(--spacing-07);
  border-left: 3px solid var(--interactive);
}

.hero-cta {
  margin-top: var(--spacing-09);
  text-align: center;
}

.cta-button {
  display: inline-block;
  padding: var(--spacing-05) var(--spacing-07);
  font-size: 1rem;
  font-weight: 400;
  background: var(--interactive);
  color: var(--text-on-color);
  border: none;
  border-radius: 0;
  text-decoration: none;
  transition: background var(--transition-fast);
  line-height: 1.29;
}

.cta-button:hover {
  background: var(--link-primary-hover);
}

.cta-button:focus {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

/* Section Styling */
.section {
  padding: var(--layout-05) var(--layout-03);
  max-width: 99rem;
  margin: 0 auto;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.625rem);
  font-weight: 300;
  margin-bottom: var(--spacing-09);
  color: var(--text-primary);
  position: relative;
  padding-bottom: var(--spacing-05);
  letter-spacing: 0;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 4rem;
  height: 2px;
  background: var(--interactive);
}

/* Modern Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: var(--spacing-05);
  margin-top: var(--spacing-07);
}

.modern-card {
  background: var(--layer-01);
  border: 1px solid var(--border-subtle);
  border-radius: 0;
  padding: var(--spacing-07);
  transition: background var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  border-left: 3px solid transparent;
}

.modern-card:hover {
  background: var(--background-hover);
  border-left-color: var(--interactive);
}

.modern-card:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-04);
  line-height: 1.4;
}

.card-subtitle {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-05);
  line-height: 1.29;
  text-transform: uppercase;
  letter-spacing: 0.16px;
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.43;
}

/* Why ATOM Section */
.why-atom-section {
  background: linear-gradient(135deg, rgba(15, 98, 254, 0.05) 0%, var(--background) 100%),
              url('_next/static/media/IBM-watsonx-Brings.29759cb3.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  padding: var(--layout-06) var(--layout-03);
  margin: var(--layout-05) 0;
}

/* Partners Section */
.partners-section {
  padding: var(--layout-05) var(--layout-03);
  overflow: hidden;
  background: var(--layer-01);
}

.partners-scroll {
  display: flex;
  align-items: center;
  gap: var(--spacing-10);
  animation: scroll 30s linear infinite;
  width: max-content;
}

.partners-scroll:hover {
  animation-play-state: paused;
}

.partner-logo {
  height: 48px;
  width: auto;
  filter: grayscale(100%) opacity(0.6);
  transition: filter var(--transition-fast);
}

.partner-logo:hover {
  filter: grayscale(0%) opacity(1);
}

[data-theme="light"] .partner-logo {
  filter: grayscale(100%) brightness(0.3) opacity(0.8);
}

[data-theme="light"] .partner-logo:hover {
  filter: grayscale(0%) brightness(1) opacity(1);
}

/* Modern Footer */
.modern-footer {
  background: var(--layer-01);
  border-top: 1px solid var(--border-subtle);
  padding: var(--spacing-07) var(--layout-03);
  margin-top: var(--layout-05);
}

.footer-content {
  max-width: 99rem;
  margin: 0 auto;
}

.footer-top {
  margin-bottom: var(--spacing-06);
}

.footer-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.43;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 66rem) {
  .footer-info {
    white-space: normal;
    overflow: visible;
  }
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-05);
  padding-top: var(--spacing-06);
  border-top: 1px solid var(--border-subtle);
}

.footer-bottom-left {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.34;
}

.footer-bottom-left a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-bottom-left a:hover {
  color: var(--link-primary);
  text-decoration: underline;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-06);
  list-style: none;
}

.footer-links a {
  color: var(--link-primary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
  line-height: 1.29;
}

.footer-links a:hover {
  color: var(--link-primary-hover);
  text-decoration: underline;
}

.footer-links a:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Animations */
@keyframes scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* Mobile Optimizations */
@media (max-width: 42rem) {
  .nav-container {
    padding: var(--spacing-04) var(--spacing-05);
  }

  .logo-img {
    height: 24px;
  }

  /* Show burger menu on mobile */
  .burger-menu {
    display: flex;
  }

  /* Hide nav actions by default on mobile */
  .nav-actions {
    position: fixed;
    top: 3.75rem;
    left: 0;
    right: 0;
    background: var(--layer-01);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--spacing-05);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all var(--transition-moderate);
    border-bottom: 1px solid transparent;
    box-shadow: none;
  }

  /* Show nav actions when active */
  .nav-actions.active {
    max-height: 100vh;
    opacity: 1;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-02);
  }

  /* Style nav items for mobile menu */
  .nav-actions > * {
    width: 100%;
    text-align: center;
    padding: var(--spacing-05);
    margin-bottom: var(--spacing-03);
  }

  .theme-toggle {
    width: 100%;
    height: 48px;
    border-radius: 0;
  }

  .fedramp-badge,
  .demo-btn {
    font-size: 0.875rem;
    padding: var(--spacing-05);
    display: block;
  }

  .hero-section {
    padding: var(--layout-05) var(--spacing-05) var(--layout-04);
    background-attachment: scroll;
  }

  .section {
    padding: var(--layout-04) var(--spacing-05);
  }

  .section-title {
    margin-bottom: var(--spacing-07);
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-05);
  }

  .modern-card {
    padding: var(--spacing-06);
  }

  .why-atom-section {
    padding: var(--layout-04) var(--spacing-05);
    background-attachment: scroll;
  }

  .partners-scroll {
    gap: var(--spacing-07);
  }

  .partner-logo {
    height: 32px;
  }

  .footer-links {
    gap: var(--spacing-05);
  }

  .modern-footer {
    padding: var(--spacing-06) var(--spacing-05);
  }
}

@media (min-width: 42rem) and (max-width: 66rem) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-section {
    padding: var(--layout-06) var(--layout-02) var(--layout-05);
  }
}

/* Tablet landscape and desktop */
@media (min-width: 66rem) {
  .footer-top {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .footer-info {
    max-width: 60%;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .modern-nav,
  .modern-footer,
  .theme-toggle {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}