/* ==========================================================================
   SAVANT-AI Website Stylesheet
   Cinematic. Warm-yet-technological. Executive-level.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg-primary: #0f1722;
  --color-bg-secondary: #1a2332;
  --color-bg-card: #243447;
  --color-accent-gold: #d4a855;
  --color-accent-teal: #4a6b7c;
  --color-text-heading: #ffffff;
  --color-text-body: #e8e8e8;
  --color-text-muted: #8a9bab;
  --color-border: #2d3f52;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1.125rem;
  --font-size-small: 0.875rem;
  --font-size-h1: 3rem;
  --font-size-h2: 2rem;
  --font-size-h3: 1.5rem;
  --font-size-h4: 1.25rem;
  --line-height-body: 1.7;
  --line-height-heading: 1.2;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --max-width-content: 720px;
  --max-width-wide: 1100px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  color: var(--color-text-body);
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-heading);
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-sm);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-h2);
  margin-top: var(--space-lg);
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: 500;
  margin-top: var(--space-md);
}

h4 {
  font-size: var(--font-size-h4);
  font-weight: 500;
  color: var(--color-accent-gold);
}

p {
  margin-bottom: var(--space-sm);
}

p + p {
  margin-top: var(--space-sm);
}

strong {
  font-weight: 600;
  color: var(--color-text-heading);
}

em {
  font-style: italic;
}

small, .text-small {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */
a {
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-text-heading);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--max-width-content);
}

.section {
  padding: var(--space-xl) 0;
}

.section--hero {
  padding: var(--space-xl) 0 var(--space-lg);
  min-height: 60vh;
  display: flex;
  align-items: center;
  background-image: linear-gradient(rgba(15, 23, 34, 0.85), rgba(15, 23, 34, 0.95)),
                    url('../images/hero/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  background: rgba(15, 23, 34, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-heading);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-logo img {
  height: 42px;
  width: auto;
}

.site-logo .logo-text {
  display: inline;
}

.site-logo .logo-accent {
  color: var(--color-accent-gold);
}

.site-nav {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text-heading);
  border-bottom-color: var(--color-accent-gold);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-heading);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  text-align: left;
}

.hero__tagline {
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-md);
  max-width: 800px;
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: var(--space-md);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn--primary {
  background: var(--color-accent-gold);
  color: var(--color-bg-primary);
  border-color: var(--color-accent-gold);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent-gold);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text-heading);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.card__title {
  font-size: var(--font-size-h4);
  margin-bottom: var(--space-xs);
}

.card__meta {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

/* --------------------------------------------------------------------------
   Stats / Metrics
   -------------------------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.stat {
  text-align: center;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
}

.stat__number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --------------------------------------------------------------------------
   Feature Grid
   -------------------------------------------------------------------------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.feature {
  padding: var(--space-md);
  border-left: 3px solid var(--color-accent-gold);
  background: rgba(36, 52, 71, 0.5);
}

.feature__title {
  font-size: var(--font-size-h4);
  color: var(--color-text-heading);
  margin-bottom: var(--space-xs);
}

.feature__text {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Team Bios
   -------------------------------------------------------------------------- */
.team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.team-member {
  text-align: left;
}

.team-member__image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-accent-gold);
  margin-bottom: var(--space-sm);
}

.team-member__name {
  font-size: var(--font-size-h3);
  margin-bottom: var(--space-xs);
}

.team-member__title {
  font-size: var(--font-size-small);
  color: var(--color-accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.team-member__bio {
  color: var(--color-text-body);
}

/* --------------------------------------------------------------------------
   Framework / Methodology Tables
   -------------------------------------------------------------------------- */
.framework-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

.framework-table th,
.framework-table td {
  padding: var(--space-sm);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.framework-table th {
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-teal);
  font-weight: 500;
}

.framework-table td {
  color: var(--color-text-body);
}

.framework-table tr:hover td {
  background: rgba(36, 52, 71, 0.3);
}

/* --------------------------------------------------------------------------
   Blockquote
   -------------------------------------------------------------------------- */
blockquote {
  border-left: 3px solid var(--color-accent-gold);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  font-size: 1.25rem;
  color: var(--color-text-muted);
  font-style: italic;
}

blockquote cite {
  display: block;
  margin-top: var(--space-sm);
  font-size: var(--font-size-small);
  font-style: normal;
  color: var(--color-accent-gold);
}

/* --------------------------------------------------------------------------
   Lists
   -------------------------------------------------------------------------- */
ul, ol {
  margin: var(--space-sm) 0 var(--space-md);
  padding-left: var(--space-md);
}

li {
  margin-bottom: var(--space-xs);
}

li::marker {
  color: var(--color-accent-gold);
}

/* --------------------------------------------------------------------------
   Dividers
   -------------------------------------------------------------------------- */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0;
}

.divider--gold {
  border-top-color: var(--color-accent-gold);
  width: 60px;
  margin: var(--space-md) 0;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  padding: var(--space-lg) 0 var(--space-md);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
}

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

.site-footer__copy {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.site-footer__links {
  display: flex;
  gap: var(--space-md);
}

.site-footer__links a {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-gold { color: var(--color-accent-gold); }
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }

/* Spacer for fixed header */
.header-spacer {
  height: 80px;
}

/* --------------------------------------------------------------------------
   Client Logo Bar
   -------------------------------------------------------------------------- */
.client-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
  opacity: 0.7;
}

.client-logos img {
  height: 40px;
  width: auto;
  filter: grayscale(100%) brightness(2);
  transition: all 0.3s ease;
}

.client-logos img:hover {
  opacity: 1;
  filter: grayscale(0%) brightness(1);
}

/* --------------------------------------------------------------------------
   Scroll-Triggered Animations
   -------------------------------------------------------------------------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Micro-Interactions & Polish
   -------------------------------------------------------------------------- */
.feature,
.card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover,
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.stat {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.stat__number {
  transition: transform 0.3s ease;
}

.stat:hover .stat__number {
  transform: scale(1.1);
}

.btn {
  transition: all 0.2s ease, transform 0.1s ease;
}

.btn:active {
  transform: scale(0.98);
}

blockquote {
  transition: transform 0.3s ease;
}

blockquote:hover {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --font-size-h1: 2.25rem;
    --font-size-h2: 1.75rem;
    --font-size-h3: 1.25rem;
    --space-lg: 3rem;
    --space-xl: 4rem;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-primary);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero__title {
    font-size: 2rem;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer .container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .section--hero {
    background-attachment: scroll; /* Fixed attachment causes issues on mobile */
  }

  .client-logos {
    gap: var(--space-md);
  }

  .client-logos img {
    height: 30px;
  }
}

@media (max-width: 480px) {
  .stats {
    grid-template-columns: 1fr;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .client-logos {
    gap: var(--space-sm);
  }

  .client-logos img {
    height: 24px;
  }
}