/* Fox River AI Lab - Design System */

:root {
  /* Colors */
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-bg-card: #1a1a24;
  --color-border: #2a2a3a;
  --color-text: #e8e8ed;
  --color-text-muted: #8888a0;
  --color-accent: #4a9eff;
  --color-accent-hover: #6ab0ff;
  --color-accent-glow: rgba(74, 158, 255, 0.15);
  --color-success: #4ade80;
  --color-error: #f87171;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-accent {
  color: var(--color-accent);
}

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

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

section {
  padding: var(--space-2xl) 0;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav__logo:hover {
  color: var(--color-text);
}

.nav__logo-mark {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #8b5cf6 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  color: white;
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav__link {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-sm);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: radial-gradient(ellipse at center top, var(--color-accent-glow) 0%, transparent 60%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-accent-glow);
  border-radius: 100px;
  border: 1px solid rgba(74, 158, 255, 0.2);
}

.hero__title {
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: var(--space-xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #000;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #000;
  transform: translateY(-2px);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.btn-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Cards */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

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

.card__text {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Section Headers */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.section-header__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.section-header__title {
  margin-bottom: var(--space-md);
}

.section-header__text {
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

/* Feature List */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.feature-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.feature-list__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  margin-top: 2px;
}

/* Project Card */
.project-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  border-color: var(--color-accent);
}

.project-card__image {
  aspect-ratio: 16/9;
  background: var(--color-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-card__content {
  padding: 0 var(--space-lg) var(--space-lg);
}

.project-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  margin-bottom: var(--space-md);
}

.project-card__title {
  margin-bottom: var(--space-sm);
}

.project-card__text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

/* Form */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form__label {
  font-weight: 500;
  font-size: 0.95rem;
}

.form__input,
.form__textarea {
  width: 100%;
  padding: var(--space-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form__textarea {
  min-height: 150px;
  resize: vertical;
}

.form__status {
  padding: var(--space-md);
  border-radius: 8px;
  font-weight: 500;
  display: none;
}

.form__status--success {
  display: block;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.form__status--error {
  display: block;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

/* Footer */
.footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
}

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

.footer__text {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer__link {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer__link:hover {
  color: var(--color-text);
}

/* About Page */
.page-header {
  padding-top: 120px;
  padding-bottom: var(--space-xl);
  text-align: center;
}

.page-header__title {
  margin-bottom: var(--space-md);
}

.page-header__text {
  color: var(--color-text-muted);
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto;
}

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

.content-section__title {
  margin-bottom: var(--space-lg);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.value-item {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.value-item__number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.value-item__title {
  margin-bottom: var(--space-sm);
}

.value-item__text {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
    gap: 0;
  }

  .nav__links--open {
    display: flex;
  }

  .nav__link {
    display: block;
    padding: var(--space-md);
  }

  .nav__toggle {
    display: block;
  }

  .hero {
    min-height: auto;
    padding-top: 120px;
    padding-bottom: var(--space-xl);
  }

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

  .btn-group {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .project-card {
    grid-template-columns: 1fr;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }