/* ML3T Custom Theme - Applied AI Design System */
/* Sibling brand to Applied AI: Same DNA, educational focus */

/* ===== Applied AI Design System ===== */
:root {
  /* Primary Colors - Picasso Blue Period */
  --ml3t-navy: #0a1628;           /* Deep navy (primary) */
  --ml3t-navy-light: #152238;     /* Lighter navy */
  --ml3t-slate: #1a2d4a;          /* Slate blue */
  --ml3t-navy-dark: #050b14;      /* Darkest navy */

  /* Accent Colors */
  --ml3t-amber: #D4A84B;          /* Warm amber (CTAs, highlights) */
  --ml3t-amber-light: #E4B85B;    /* Lighter amber */
  --ml3t-copper: #C87533;         /* Copper accent */

  /* Neutral Colors - Warm Palette */
  --ml3t-silver: #C0C0C0;         /* Silver text on dark */
  --ml3t-off-white: #FAFAF9;      /* Warm off-white background */
  --ml3t-warm-white: #F8F8F6;     /* Slightly warmer white */
  --ml3t-silver-muted: #e8e8e6;   /* Muted silver for borders */

  /* Text Colors */
  --ml3t-text: #334155;           /* Medium slate-gray (body text) */
  --ml3t-text-light: #64748b;     /* Lighter text */
  --ml3t-text-dark: #1e293b;      /* Darker text */

  /* Semantic Colors */
  --ml3t-success: #10b981;
  --ml3t-warning: #D4A84B;
  --ml3t-error: #ef4444;
  --ml3t-info: #06b6d4;

  /* Typography - Applied AI Stack */
  --ml3t-font-serif: 'Source Serif 4', Georgia, serif;
  --ml3t-font-sans: 'DM Sans', system-ui, sans-serif;
  --ml3t-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --ml3t-max-width: 1400px;
  --ml3t-hero-height: 85vh;

  /* Shadows */
  --ml3t-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --ml3t-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --ml3t-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --ml3t-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --ml3t-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* ===== Global Styles ===== */
body {
  font-family: var(--ml3t-font-sans);
  color: var(--ml3t-text);
  line-height: 1.6;
  background-color: var(--ml3t-off-white);
}

/* ===== Typography ===== */
/* Headlines use Source Serif 4 - color inherits from parent to work on dark backgrounds */
.ml3t-h1, h1 {
  font-family: var(--ml3t-font-serif);
  font-size: 3.75rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.ml3t-h2, h2 {
  font-family: var(--ml3t-font-serif);
  font-size: 3rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.ml3t-h3, h3 {
  font-family: var(--ml3t-font-serif);
  font-size: 2.25rem;
  font-weight: 500;
  line-height: 1.3;
}

.ml3t-h4, h4 {
  font-family: var(--ml3t-font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.4;
}

/* Headings in dark sections MUST be light colored - use !important to override everything */
.bg-gray-900 h1, .bg-gray-900 h2, .bg-gray-900 h3, .bg-gray-900 h4,
.bg-gray-800 h1, .bg-gray-800 h2, .bg-gray-800 h3, .bg-gray-800 h4,
.bg-primary h1, .bg-primary h2, .bg-primary h3, .bg-primary h4,
.ml3t-section-dark h1, .ml3t-section-dark h2, .ml3t-section-dark h3, .ml3t-section-dark h4,
section.text-white h1, section.text-white h2, section.text-white h3, section.text-white h4 {
  color: #F8F8F6 !important;
}

.ml3t-lead {
  font-family: var(--ml3t-font-sans);
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--ml3t-text-light);
}

/* ===== Hero Section - Applied AI Style ===== */
.ml3t-hero {
  background: var(--ml3t-navy);
  min-height: var(--ml3t-hero-height);
  position: relative;
  overflow: hidden;
}

.ml3t-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--ml3t-navy) 0%, var(--ml3t-slate) 100%);
  opacity: 1;
}

/* Hero text on dark background */
.ml3t-hero-text {
  color: var(--ml3t-warm-white);
}

.ml3t-hero-text h1 {
  color: var(--ml3t-warm-white);
}

.ml3t-hero-text .ml3t-lead {
  color: var(--ml3t-silver);
}

/* ===== Wave Animation (from Applied AI) ===== */
.wave-container {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 150px;
  overflow: hidden;
}

.wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23FAFAF9' fill-opacity='0.5' d='M0,160L48,176C96,192,192,224,288,213.3C384,203,480,149,576,149.3C672,149,768,203,864,208C960,213,1056,171,1152,149.3C1248,128,1344,128,1392,128L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E") repeat-x;
  background-size: 50% 100%;
  animation: wave 20s linear infinite;
}

.wave:nth-child(2) {
  bottom: 10px;
  opacity: 0.5;
  animation: wave 15s linear infinite reverse;
}

.wave:nth-child(3) {
  bottom: 20px;
  opacity: 0.3;
  animation: wave 25s linear infinite;
}

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

/* ===== Navigation - Applied AI Style ===== */
.ml3t-nav {
  backdrop-filter: blur(10px);
  background: rgba(250, 250, 249, 0.95);
  border-bottom: 1px solid var(--ml3t-silver-muted);
  transition: all 300ms ease;
}

.ml3t-nav-transparent {
  background: transparent;
  border-bottom: 1px solid transparent;
}

.ml3t-nav-scrolled {
  background: rgba(250, 250, 249, 0.98);
  border-bottom: 1px solid var(--ml3t-silver-muted);
  box-shadow: var(--ml3t-shadow);
}

/* Nav links */
.ml3t-nav-link {
  color: var(--ml3t-text);
  font-weight: 500;
  transition: color 200ms ease;
}

.ml3t-nav-link:hover {
  color: var(--ml3t-navy);
}

.ml3t-nav-transparent .ml3t-nav-link {
  color: var(--ml3t-silver);
}

.ml3t-nav-transparent .ml3t-nav-link:hover {
  color: var(--ml3t-warm-white);
}

/* ===== Cards - Applied AI Style ===== */
.ml3t-card {
  background: white;
  border-radius: 0.75rem;
  box-shadow: var(--ml3t-shadow);
  transition: all 300ms ease;
  overflow: hidden;
  border: 1px solid var(--ml3t-silver-muted);
}

.ml3t-card:hover {
  box-shadow: var(--ml3t-shadow-lg);
  transform: translateY(-4px);
  border-color: var(--ml3t-amber);
}

.ml3t-card-dark {
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
  border-color: var(--ml3t-slate);
}

.ml3t-card-dark:hover {
  border-color: var(--ml3t-amber);
}

/* ===== Buttons - Applied AI Style ===== */
.ml3t-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--ml3t-font-sans);
  font-weight: 600;
  border-radius: 0.5rem;
  transition: all 200ms ease;
  text-decoration: none;
  cursor: pointer;
}

.ml3t-btn-primary {
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
}

.ml3t-btn-primary:hover {
  background: var(--ml3t-navy-light);
  transform: translateY(-2px);
  box-shadow: var(--ml3t-shadow-lg);
}

.ml3t-btn-amber {
  background: var(--ml3t-amber);
  color: var(--ml3t-navy);
}

.ml3t-btn-amber:hover {
  background: var(--ml3t-amber-light);
  transform: translateY(-2px);
  box-shadow: var(--ml3t-shadow-lg);
}

.ml3t-btn-outline {
  border: 2px solid var(--ml3t-navy);
  color: var(--ml3t-navy);
  background: transparent;
}

.ml3t-btn-outline:hover {
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
}

.ml3t-btn-outline-light {
  border: 2px solid var(--ml3t-warm-white);
  color: var(--ml3t-warm-white);
  background: transparent;
}

.ml3t-btn-outline-light:hover {
  background: var(--ml3t-warm-white);
  color: var(--ml3t-navy);
}

/* ===== Stats Section - Clean Style ===== */
.ml3t-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: center;
}

.ml3t-stat-value {
  font-family: var(--ml3t-font-serif);
  font-size: 3rem;
  font-weight: 600;
  color: var(--ml3t-amber);
  line-height: 1;
}

.ml3t-stat-label {
  font-family: var(--ml3t-font-sans);
  font-size: 1rem;
  color: var(--ml3t-text-light);
  margin-top: 0.5rem;
}

/* On dark backgrounds */
.ml3t-stats-dark .ml3t-stat-value {
  color: var(--ml3t-amber);
}

.ml3t-stats-dark .ml3t-stat-label {
  color: var(--ml3t-silver);
}

/* ===== Chapter Cards ===== */
.ml3t-chapter-card {
  border: 1px solid var(--ml3t-silver-muted);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 200ms ease;
  background: white;
}

.ml3t-chapter-card:hover {
  border-color: var(--ml3t-amber);
  box-shadow: var(--ml3t-shadow-md);
}

.ml3t-chapter-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
  font-family: var(--ml3t-font-sans);
  font-weight: 700;
  font-size: 1.125rem;
}

/* ===== Code Blocks ===== */
.ml3t-code {
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
  padding: 1.5rem;
  border-radius: 0.75rem;
  font-family: var(--ml3t-font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  overflow-x: auto;
}

/* ===== Footer - Applied AI Style ===== */
.ml3t-footer {
  background: var(--ml3t-navy);
  color: var(--ml3t-silver);
  padding: 4rem 0 2rem;
}

.ml3t-footer a {
  color: var(--ml3t-silver);
  transition: color 200ms ease;
}

.ml3t-footer a:hover {
  color: var(--ml3t-warm-white);
}

.ml3t-footer-heading {
  font-family: var(--ml3t-font-serif);
  color: var(--ml3t-warm-white);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* ===== Sections ===== */
.ml3t-section {
  padding: 5rem 0;
}

.ml3t-section-alt {
  background: var(--ml3t-warm-white);
}

.ml3t-section-dark {
  background: var(--ml3t-navy);
  color: var(--ml3t-warm-white);
}

/* ===== Feature Grid ===== */
.ml3t-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.ml3t-feature-card {
  padding: 2rem;
  text-align: center;
  border-radius: 0.75rem;
  background: white;
  border: 1px solid var(--ml3t-silver-muted);
  transition: all 300ms ease;
}

.ml3t-feature-card:hover {
  border-color: var(--ml3t-amber);
  box-shadow: var(--ml3t-shadow-lg);
  transform: translateY(-4px);
}

.ml3t-feature-icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 1rem;
  background: var(--ml3t-navy);
  color: var(--ml3t-amber);
  font-size: 1.5rem;
}

/* ===== Animations ===== */
.ml3t-fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.ml3t-slide-in {
  animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
  from { transform: translateX(-100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .ml3t-h1, h1 { font-size: 2.5rem; }
  .ml3t-h2, h2 { font-size: 2rem; }
  .ml3t-h3, h3 { font-size: 1.5rem; }
  .ml3t-hero { min-height: 70vh; }
  .ml3t-section { padding: 3rem 0; }
}

/* ===== Utility Classes ===== */
.text-navy { color: var(--ml3t-navy); }
.text-amber { color: var(--ml3t-amber); }
.text-silver { color: var(--ml3t-silver); }
.bg-navy { background-color: var(--ml3t-navy); }
.bg-off-white { background-color: var(--ml3t-off-white); }
.border-amber { border-color: var(--ml3t-amber); }
.font-serif { font-family: var(--ml3t-font-serif); }
.font-sans { font-family: var(--ml3t-font-sans); }