/* =========================================================
   CSS Custom Properties — change colors/spacing here only
   ========================================================= */
:root {
  --bg-primary:    #0a0a0f;
  --bg-secondary:  #12121a;
  --bg-card:       #16161f;
  --border:        #232333;
  --border-hover:  #6366f1;

  --text-primary:   #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted:     #52525b;

  --accent:        #f97316;
  --accent-light:  #fb923c;
  --accent-glow:   rgba(249, 115, 22, 0.12);

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  --container-width: 900px;
  --section-gap: 7rem;
  --nav-height: 64px;
  --radius: 12px;

  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

/* =========================================================
   Layout
   ========================================================= */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* =========================================================
   Navigation
   ========================================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav--scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav__logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: 0.05em;
}

.nav__links {
  display: flex;
  gap: 2.5rem;
}

.nav__links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav__toggle--active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle--active span:nth-child(2) { opacity: 0; }
.nav__toggle--active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 2rem) 0 4rem;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(249,115,22,0.07) 0%, transparent 70%);
}

.hero__greeting {
  font-size: 1rem;
  color: var(--accent-light);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.hero__tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 2.5rem;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.hero__cta:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

.hero__cta::after {
  content: '↓';
}

/* =========================================================
   Section headings
   ========================================================= */
.section__title {
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 1rem;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* =========================================================
   Projects Grid
   ========================================================= */
.projects {
  background: var(--bg-secondary);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

/* =========================================================
   Project Card
   ========================================================= */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-2px);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.card__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card__badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-light);
  background: var(--accent-glow);
  border: 1px solid rgba(249,115,22,0.25);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  white-space: nowrap;
}

.card__description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card__features {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card__features li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 1.1rem;
  position: relative;
}

.card__features li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.5rem;
}

.card__tech span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-light);
  background: var(--accent-glow);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
}

.card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.card__link {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.card__link:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.card__link--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.card__link--primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  color: #fff;
}

/* =========================================================
   About
   ========================================================= */
.about__content {
  max-width: 620px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about__content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* =========================================================
   Scroll fade-in animations
   ========================================================= */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

/* =========================================================
   Responsive — 768px breakpoint
   ========================================================= */
@media (max-width: 768px) {
  :root {
    --section-gap: 4.5rem;
  }

  /* Mobile nav */
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav__links.nav__links--open {
    display: flex;
  }

  .nav__links li {
    width: 100%;
    text-align: center;
  }

  .nav__links a {
    display: block;
    padding: 0.9rem 1.5rem;
    font-size: 1rem;
  }

  /* Single-column project grid on mobile */
  .projects__grid {
    grid-template-columns: 1fr;
  }
}