/* ============================================================
   UAX Static Site — Design System & Styles
   ============================================================ */

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

:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --bg-nav: rgba(10, 10, 15, 0.8);
  --bg-nav-scrolled: rgba(10, 10, 15, 0.95);

  --text-primary: #e8e8ed;
  --text-secondary: #9898a6;
  --text-muted: #5e5e6e;

  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.25);

  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

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

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.nav--scrolled {
  background: var(--bg-nav-scrolled);
  border-bottom-color: var(--border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav__container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.nav__logo-icon {
  color: var(--accent-light);
  font-size: 1.1rem;
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after {
  width: 100%;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero__bg-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  animation: glowPulse 6s ease-in-out infinite alternate;
}

@keyframes glowPulse {
  0% { opacity: 0.4; transform: translateX(-50%) scale(1); }
  100% { opacity: 0.7; transform: translateX(-50%) scale(1.15); }
}

.hero__container {
  text-align: center;
  padding: var(--space-xl);
  position: relative;
  z-index: 1;
  max-width: 750px;
}

.hero__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: var(--space-xl);
  animation: fadeInDown 0.6s ease-out;
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease-out 0.15s both;
}

.hero__title--accent {
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease-out 0.45s both;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn--ghost:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

/* ============================================================
   Sections
   ============================================================ */
.section {
  padding: var(--space-3xl) var(--space-xl);
}

.section--alt {
  background: var(--bg-secondary);
}

.section__container {
  max-width: 1100px;
  margin: 0 auto;
}

.section__container--narrow {
  max-width: 650px;
  margin: 0 auto;
  text-align: center;
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2xl);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: var(--radius-full);
}

.section__container--narrow .section__title::after {
  left: 50%;
  transform: translateX(-50%);
}

/* ============================================================
   About Cards
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================================
   Project Cards
   ============================================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}

.project-card:hover {
  border-color: var(--accent-glow);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px var(--accent-glow);
}

.project-card__header {
  margin-bottom: var(--space-md);
}

.project-card__tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(108, 92, 231, 0.1);
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-card__title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.project-card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.project-card__tech {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.tech-badge {
  padding: 0.2rem 0.65rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* ============================================================
   Contact
   ============================================================ */
.contact__text {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
}

.contact__links {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.contact__link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.contact__link:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.contact__link-icon {
  color: var(--accent-light);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-xl);
}

.footer__container {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer__text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================================
   Scroll Reveal Animations
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

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

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

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .nav__links {
    gap: var(--space-md);
  }

  .nav__link {
    font-size: 0.85rem;
  }

  .hero__container {
    padding: var(--space-md);
  }

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

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .nav__container {
    padding: var(--space-sm) var(--space-md);
  }

  .nav__logo {
    font-size: 1rem;
  }

  .about__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }
}