/* Copyright (c) Meta Platforms, Inc. and affiliates. All rights reserved. */

/* -----------------------------------------------------------------
   Font Face Declarations
   ----------------------------------------------------------------- */
@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_Regular.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_Regular.woff') format('woff');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_RegularIt.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_RegularIt.woff') format('woff');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_Medium.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_Medium.woff') format('woff');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_MediumIt.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_MediumIt.woff') format('woff');
  font-weight: 500;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_SemiBold.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_SemiBold.woff') format('woff');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_SemiBoldIt.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_SemiBoldIt.woff') format('woff');
  font-weight: 600;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_Bold.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_Bold.woff') format('woff');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Optimistic';
  src: url('../fonts/WOFF2/Optimistic_W_BoldIt.woff2') format('woff2'),
       url('../fonts/WOFF/Optimistic_W_BoldIt.woff') format('woff');
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

/* -----------------------------------------------------------------
   CSS Variables
   ----------------------------------------------------------------- */
:root {
  /* Colors */
  --color-text-primary: #1c2b33;
  --color-text-secondary: #65676b;
  --color-text-tertiary: #4b4c4f;
  --color-accent: #3a76f0;
  --color-accent-hover: #0a66e0;
  --color-surface: #f0f2f5;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-dark: #1a1a2e;
  --color-border: #e5e7eb;
  --color-code-bg: #1e1e1e;
  
  /* Typography */
  --font-family-primary: 'Optimistic Text', 'Optimistic', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-display: 'Optimistic Disp', 'Optimistic', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Layout */
  --nav-height: 72px;
  --container-width: 1000px;
  --container-width-wide: 1400px;
  --container-width-max: 1440px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 50px;
  
  /* Shadows */
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* -----------------------------------------------------------------
   Typography
   ----------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-display);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
}

h1 {
  font-size: var(--font-size-4xl);
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* Utility Classes */
.text-eyebrow {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.text-lead {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.text-center {
  text-align: center;
}

/* -----------------------------------------------------------------
   Layout
   ----------------------------------------------------------------- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-wide {
  max-width: var(--container-width-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-max {
  max-width: var(--container-width-max);
  margin: 0 auto;
  padding: 0 4.5rem;
}

/* Grid System */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-sm);
}

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* Section */
section {
  padding: var(--spacing-xl) 0;
}

section[id] {
  scroll-margin-top: calc(var(--nav-height) + var(--spacing-lg));
}

/* -----------------------------------------------------------------
   Navigation
   ----------------------------------------------------------------- */
.nav {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-width-max);
  padding: 0 4rem;
}

.nav .logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-white);
}

.nav .logo img.logo-svg { 
  height: 24px;
  width: auto;
  filter: brightness(0) invert(1); 
}

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

.nav nav a {
  color: var(--color-white);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav nav a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* Sticky Sub-Navigation */
.sticky-sub-nav {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: 1.125rem 0;
  transition: box-shadow var(--transition-base);
}

.sticky-sub-nav-content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xl);
}

.sticky-sub-nav a {
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
  text-align: center;
}

.sticky-sub-nav a:hover,
.sticky-sub-nav a.active {
  color: var(--color-accent);
}

.sticky-sub-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

/* -----------------------------------------------------------------
   Hero Section
   ----------------------------------------------------------------- */
.hero {
  margin-top: 0;
  background: var(--color-black);
  padding: 0;
  text-align: left;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  height: calc(100vh - var(--nav-height));
  min-height: 750px;
  max-height: 1000px;
  display: flex;
  align-items: flex-end;
}

.hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.1) 0%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 0.6) 100%
  );
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  padding: 0 var(--spacing-xl) 5rem;
  margin: 0 auto;
}

.hero-logo {
  margin: 0 0 var(--spacing-lg) 0;
}

.hero-logo img {
  height: 40px;
  width: auto;
  opacity: 0.9;
}

.hero-eyebrow {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 var(--spacing-sm) 0;
}

.hero h1 {
  max-width: 800px;
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-4xl);
  line-height: 1.1;
  color: var(--color-white);
}

.hero p {
  font-size: var(--font-size-lg);
  line-height: 1.6;
  max-width: 700px;
  margin: 0 0 2.5rem 0;
  color: var(--color-white);
  opacity: 0.95;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

.hero .buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* -----------------------------------------------------------------
   Buttons
   ----------------------------------------------------------------- */
.btn-primary {
  display: inline-block;
  padding: 0.875rem 2.25rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--font-size-base);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  background: #1877f2;
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(24, 119, 242, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(24, 119, 242, 0.4);
}

.btn-secondary {
  display: inline-block;
  padding: 0.75rem 2.125rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--font-size-base);
  text-decoration: none;
  border: 2px solid var(--color-white);
  cursor: pointer;
  transition: all var(--transition-base);
  background: transparent;
  color: var(--color-white);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

/* Toggle Buttons */
.toggle-wrapper {
  background: #e4e6eb;
  display: inline-flex;
  border-radius: var(--radius-pill);
  padding: 4px;
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.toggle-btn {
  background: transparent;
  border: none;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
  z-index: 2;
}

.toggle-btn.active {
  color: var(--color-white);
  background-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.toggle-btn:hover:not(.active) {
  background-color: rgba(0, 0, 0, 0.05);
}

/* -----------------------------------------------------------------
   Code Section
   ----------------------------------------------------------------- */
#code {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  background: var(--color-white);
}

.code-container {
  max-width: var(--container-width-max);
  padding: 0 4.5rem;
}

.code-eyebrow {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  font-size: var(--font-size-xs);
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
}

#code h2 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-4xl);
  line-height: 1.1;
  letter-spacing: -0.05em;
}

.code-desc {
  margin: 0 0 var(--spacing-xl) 0;
  max-width: 800px;
  font-size: 1.125rem;
  line-height: 1.44;
  letter-spacing: -0.01em;
}

.repo-links {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.repo-links a {
  padding: 0.875rem 2rem;
  background: var(--color-accent);
  color: var(--color-white);
  text-decoration: none;
  border-radius: var(--radius-pill);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.repo-links a:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

.github-icon {
  width: 20px;         /* Size of the icon */
  height: 20px;
  transform: translateY(4px) translateX(8px);
  fill: currentColor;  /* Makes icon take the same color as the text */
}

/* Terminal Display */
.terminal-wrapper {
  position: relative;
  margin-bottom: 3.75rem;
  display: flex;
  justify-content: center;
}

.terminal-window {
  background-color: var(--color-code-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid #333;
  width: 100%;
  max-width: 800px;
  position: relative;
  z-index: 2;
}

.terminal-header {
  background-color: #252526;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #333;
}

.terminal-controls {
  display: flex;
  gap: 0.5rem;
}

.terminal-title {
  color: #8b949e;
  font-size: 0.9rem;
  font-family: 'Monaco', monospace;
  flex-grow: 1;
  text-align: center;
  margin-left: -44px;
  opacity: 0.8;
}

.terminal-body {
  padding: var(--spacing-md);
  height: 312px;
  background-color: var(--color-code-bg);
  position: relative;
  overflow: hidden;
}

#code-display {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 15px;
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre;
}

#bits-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  overflow: visible;
}

/* Code Syntax Highlighting */
.py-def { color: #569cd6; }
.py-func { color: #dcdcaa; }
.py-str { color: #ce9178; }
.py-cls { color: #4ec9b0; }
.py-var { color: #9cdcfe; }
.py-num { color: #b5cea8; }
.py-comment { color: #6a9955; }
.py-op { color: #d4d4d4; }

.bit {
  position: absolute;
  color: #4ec9b0;
  font-family: 'Consolas', monospace;
  font-weight: bold;
  font-size: 14px;
  opacity: 0;
  text-shadow: 0 0 5px rgba(78, 201, 176, 0.4);
}

.cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background-color: #a7a7a7;
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* -----------------------------------------------------------------
   Research Section
   ----------------------------------------------------------------- */
#research {
  background: #f9fafb;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.research-container {
  max-width: var(--container-width-max);
  padding: 0 4.5rem;
}

.research-eyebrow {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  font-size: var(--font-size-xs);
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
}

#research h2 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-4xl);
  line-height: 1.1;
  letter-spacing: -0.05em;
  color: #162229;
}

.research-desc {
  margin: 0 0 var(--spacing-xl) 0;
  max-width: 800px;
  font-size: 1.125rem;
  line-height: 1.44;
  letter-spacing: -0.01em;
  color: #162229;
}

/* Research Navigation Pills */
.research-nav {
  display: flex;
  gap: var(--spacing-xs);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.research-pill {
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: #6b7280;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: var(--font-family-primary);
}

.research-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.research-pill.active {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 102, 255, 0.25);
}

.research-pill.champion {
  position: relative;
}

.research-pill.champion::after {
  content: "⭐";
  position: absolute;
  top: -8px;
  right: -8px;
  font-size: 16px;
}

/* Research Panels */
.research-panel {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.research-panel.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.research-visual-preview {
  margin: 0 0 var(--spacing-md) 0;
}

.research-visual-preview video,
.research-visual-preview img {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: var(--radius-md);
  margin: 0 auto var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

/* Research Categories (Accordion) */
.research-categories {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.research-category {
  background: transparent;
  border: none;
  border-bottom: 1px solid #e0e0e0;
  overflow: visible;
  transition: all var(--transition-base);
}

.research-category:last-child {
  border-bottom: none;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  cursor: pointer;
  background: transparent;
  transition: opacity var(--transition-fast);
}

.category-header:hover {
  opacity: 0.7;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
}

.category-icon {
  font-size: 1.25rem;
  opacity: 0.9;
}

.category-title h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-black);
  margin: 0;
}

.category-toggle {
  color: #6b7280;
  font-size: 1.25rem;
  font-weight: 300;
  transition: transform var(--transition-base);
  line-height: 1;
}

.category-content {
  max-height: 0;
  overflow: hidden;
  padding: 0 0 0 2rem;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.category-content.expanded {
  max-height: 3000px;
  padding: var(--spacing-sm) 0 var(--spacing-md) 2rem;
}

/* Research Papers */
.paper-item {
  display: block;
  padding: 0;
  margin-bottom: var(--spacing-md);
  background: transparent;
  border: none;
}

.paper-item:last-child {
  margin-bottom: 0;
}

.paper-content {
  margin-bottom: 0.75rem;
}

.paper-content h5 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-black);
  margin: 0 0 0.5rem 0;
  line-height: 1.3;
  text-align: left;
}

.paper-subtitle {
  font-size: 0.85em;
  color: #6b7280;
  font-weight: 400;
}

.paper-content p,
.paper-content-row p,
.paper-description-row p {
  font-size: 0.95rem;
  color: #4b5563;
  line-height: 1.5;
  margin: 0;
  text-align: left;
}

.paper-content-row,
.paper-description-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.paper-content-row p,
.paper-description-row p {
  flex: 1;
}

.paper-actions,
.paper-actions-inline {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  flex-shrink: 0;
}

/* Research Buttons */
.research-btn,
.research-btn-labeled,
.btn-minimal {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.research-btn-labeled,
.btn-minimal {
  background: #f3f4f6;
  color: #374151;
  border: none;
}

.research-btn-labeled:hover,
.btn-minimal:hover {
  background: #e5e7eb;
  color: var(--color-black);
}

.research-btn-labeled.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.research-btn-labeled.disabled:hover {
  background: #f3f4f6;
  color: #374151;
}

.research-btn-paper {
  background: #fef3c7;
  color: #92400e;
}

.research-btn-paper:hover {
  background: #fde68a;
}

.research-btn-github {
  background: #24292e;
  color: var(--color-white);
}

.research-btn-github:hover {
  background: #1a1e22;
}

.research-btn-demo {
  background: var(--color-accent);
  color: var(--color-white);
}

.research-btn-demo:hover {
  background: var(--color-accent-hover);
}

/* Show More Button */
.show-more-btn {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  margin-top: 0.5rem;
  background: #f3f4f6;
  border: none;
  border-radius: var(--radius-sm);
  color: #374151;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.show-more-btn:hover {
  background: #e5e7eb;
  color: var(--color-black);
}

.additional-papers {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.additional-papers.expanded {
  max-height: 1000px;
}

/* Research Grids */
.bento-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: var(--spacing-md);
  max-width: var(--container-width-wide);
  margin: 0 auto;
}

.bento-lane {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.standard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  max-width: var(--container-width);
  margin: 0 auto;
}

.hero-card-container {
  max-width: 600px;
  margin: 0 auto;
}

.research-headline {
  font-size: 1.8rem;
  font-weight: 600;
  color: #111827;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.papers-list {
  max-width: 1000px;
  margin: 0 auto;
}

.paper-item-flat {
  padding: 1.25rem 0;
  border-bottom: 1px solid #e8eaed;
}

.paper-item-flat:last-child {
  border-bottom: none;
}

.paper-header {
  margin-bottom: 0.5rem;
}

.paper-header h5 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-black);
  margin: 0 0 0.5rem 0;
  text-align: left;
}

.research-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all 0.25s ease;
}

.research-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  border-color: #d1d5db;
}

.research-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.research-card .abstract {
  font-size: 0.9rem;
  color: #6b7280;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.research-card-actions {
  display: flex;
  gap: 0.625rem;
  flex-wrap: wrap;
}

/* -----------------------------------------------------------------
   Applications Section
   ----------------------------------------------------------------- */
#applications {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.apps-container {
  max-width: var(--container-width-max);
  margin: 0 auto;
  padding: 0 4.5rem;
}

.apps-header {
  margin-bottom: var(--spacing-xl);
}

.apps-eyebrow {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  font-size: var(--font-size-xs);
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-desc {
  margin: 0;
  max-width: 800px;
  font-size: 1.125rem;
  line-height: 1.44;
  letter-spacing: -0.01em;
  color: #162229;
}

/* Carousel */
.carousel-wrapper {
  position: relative;
  margin-bottom: 2.25rem;
}

.carousel-nav-btn {
  position: absolute;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.carousel-nav-btn:hover {
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

#carousel-prev {
  left: -56px;
  top: 50%;
  transform: translateY(-50%);
}

#carousel-next {
  right: -56px;
  top: 50%;
  transform: translateY(-50%);
}

.carousel-arrow {
  font-size: 18px;
  color: var(--color-text-primary);
}

#carousel-container {
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  scroll-snap-type: x mandatory;
}

#carousel-container::-webkit-scrollbar {
  display: none;
}

.carousel-list {
  display: flex;
  gap: var(--spacing-md);
  padding: 0;
}

.carousel-card {
  flex: 0 0 480px;
  background: #f7f9fb;
  border-radius: var(--radius-xl);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  scroll-snap-align: start;
  box-sizing: border-box;
}

.carousel-card-media {
  flex: 0 0 35%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-card-media img,
.carousel-card-media video {
  width: 100%;
  max-width: 140px;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.carousel-card-content {
  flex: 1;
  text-align: left;
  min-width: 0;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.carousel-card-content h3 {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.carousel-card-content p {
  color: #4d5860;
  font-weight: 400;
  font-size: 0.8125rem;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 0;
}

.carousel-card-content a {
  color: #3b82f6;
  text-decoration: none;
  font-weight: 600;
}

#blog-link-container {
  text-align: center;
  margin-top: 2.5rem;
}

/* -----------------------------------------------------------------
   Footer
   ----------------------------------------------------------------- */
.footer {
  background: var(--color-white);
  color: var(--color-text-primary);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.footer-logo {
  display: flex;
  align-items: center;
}

.footer-logo img {
  height: 24px;
  width: auto;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.footer-logo img:hover {
  opacity: 1;
}

.footer-copyright {
  text-align: right;
}

.footer-copyright p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
}

@media (max-width: 768px) {
  .footer {
    padding: var(--spacing-md) 0;
  }
  
  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .footer-logo img {
    height: 20px;
  }
  
  .footer-copyright {
    text-align: left;
  }
  
  .footer-copyright p {
    font-size: var(--font-size-xs);
  }
}

/* -----------------------------------------------------------------
   Utility Components
   ----------------------------------------------------------------- */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  margin-left: 0.5rem;
}

.badge-new {
  background: #10b981;
  color: var(--color-white);
}

.panel {
  display: none;
}

.panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* -----------------------------------------------------------------
   Responsive Design
   ----------------------------------------------------------------- */

/* Tablet (991px and below) */
@media (max-width: 991px) {
  .col-6,
  .col-8 {
    grid-column: span 12;
  }
  
  .hero {
    height: calc(100vh - var(--nav-height));
    min-height: 600px;
    max-height: 800px;
  }
  
  .hero .container {
    padding: 0 var(--spacing-lg) 3.75rem;
  }
  
  .hero h1 {
    font-size: 2.75rem;
    max-width: 600px;
  }
  
  .hero p {
    font-size: 1.125rem;
    max-width: 550px;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .standard-grid {
    grid-template-columns: 1fr;
  }
}

/* Mobile (767px and below) */
@media (max-width: 767px) {
  .col-3,
  .col-4 {
    grid-column: span 12;
  }
  
  h1 {
    font-size: var(--font-size-3xl);
  }
  
  h2 {
    font-size: var(--font-size-2xl);
  }
  
  h3 {
    font-size: 1.25rem;
  }
  
  .text-lead {
    font-size: var(--font-size-base);
    max-width: 100%;
  }
  
  /* Navigation */
  .nav .container {
    padding: 0 var(--spacing-sm);
  }
  
  .nav nav {
    display: none;
  }
  
  .sticky-sub-nav-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
  }
  
  .sticky-sub-nav a {
    display: block;
    width: 100%;
    font-size: var(--font-size-sm);
    padding: 0.625rem 0;
  }
  
  /* Hero */
  .hero {
    height: auto;
    min-height: 700px;
    max-height: none;
  }
  
  .hero .container {
    padding: 0 var(--spacing-md) var(--spacing-xl);
  }
  
  .hero h1 {
    font-size: var(--font-size-2xl);
    max-width: 100%;
  }
  
  .hero p {
    font-size: var(--font-size-base);
    max-width: 100%;
  }
  
  .hero-logo img {
    height: 32px;
  }
  
  .hero-video {
    opacity: 0.4;
  }
  
  /* Containers */
  .container-max,
  .code-container,
  .research-container,
  .apps-container {
    padding: 0 var(--spacing-sm);
  }
  
  /* Code Section */
  #code h2,
  #research h2 {
    font-size: 2rem;
  }
  
  /* Research */
  #research {
    padding-top: 2.5rem;
  }
  
  .research-nav {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 0.375rem;
    margin-bottom: var(--spacing-md);
  }
  
  .research-pill {
    flex: 0 0 auto;
  }
  
  .category-content.expanded {
    padding: var(--spacing-sm) 0 var(--spacing-md) 0;
  }
  
  .category-title h4 {
    font-size: 1rem;
  }
  
  .paper-content-row,
  .paper-description-row {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  /* Applications */
  #applications h2 {
    font-size: 2rem;
  }
  
  #applications .text-lead {
    font-size: var(--font-size-sm);
    text-align: left;
    max-width: 100%;
  }
  
  /* Carousel */
  .carousel-nav-btn {
    width: 40px;
    height: 40px;
  }
  
  #carousel-prev {
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    left: 0.5rem;
  }
  
  #carousel-next {
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    right: 0.5rem;
    left: auto;
  }
  
  #carousel-container {
    padding: 0 0.75rem;
    scroll-padding-left: 0.75rem;
    scroll-padding-right: 0.75rem;
  }
  
  .carousel-card {
    flex: 0 0 calc(65vw - 1.5rem);
    max-width: calc(65vw - 1.5rem);
    flex-direction: column;
    padding: 0;
  }
  
  .carousel-card-media {
    flex: 0 0 auto;
    height: 38vw;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }
  
  .carousel-card-media img,
  .carousel-card-media video {
    height: 100%;
    max-width: 200px;
  }
  
  .carousel-card-content {
    padding: 0.875rem;
  }
  
  .carousel-card h3 {
    font-size: 0.9375rem;
  }
  
  .carousel-card p {
    font-size: 0.75rem;
  }
}

/* Extra Small Mobile (420px and below) */
@media (max-width: 420px) {
  .sticky-sub-nav a {
    font-size: 0.8125rem;
  }
}

/* Large Screens - Carousel Button Adjustments */
@media (max-width: 1280px) {
  #carousel-prev {
    left: -44px;
  }
  
  #carousel-next {
    right: -44px;
  }
}

@media (max-width: 1200px) {
  #carousel-prev {
    left: 0.5rem;
    top: auto;
    bottom: -56px;
    transform: translateY(0);
  }
  
  #carousel-next {
    right: auto;
    left: 56px;
    top: auto;
    bottom: -56px;
    transform: translateY(0);
  }
  
  #applications .container {
    padding-bottom: 4.5rem;
  }
}