/* ============================================
   CSS Variables & Root Configuration
   ============================================ */
:root {
  /* Colors */
  --color-dark: #0f0f0f;
  --color-dark-secondary: #1a1a1a;
  --color-dark-tertiary: #242424;
  --color-border: #2a2a2a;
  --color-text-primary: #fafafa;
  --color-text-secondary: #e0e0e0;
  --color-text-tertiary: #b0b0b0;
  --color-text-muted: #999;
  --color-text-footer: #666;
  --color-accent: #ff8a65;
  --color-accent-hover: #ff7043;

  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-mono: 'Fira Code', monospace;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Responsive Spacing - using clamp for fluid spacing */
  --spacing-header: clamp(1.5rem, 5vw, 3rem);
  --spacing-main: clamp(2rem, 8vw, 4rem);
  --spacing-section: clamp(1.5rem, 4vw, 3rem);

  /* Typography Sizing */
  --text-sm: clamp(0.85rem, 1.5vw, 0.95rem);
  --text-base: clamp(0.95rem, 2vw, 1.05rem);
  --text-lg: clamp(1.2rem, 3vw, 1.3rem);
  --text-xl: clamp(1.8rem, 5vw, 2.5rem);
  --text-2xl: clamp(2.5rem, 8vw, 3.5rem);

  /* Border Radius */
  --border-radius: 1.5rem;

  /* Transitions */
  --transition-fast: 0.2s;
  --transition-base: 0.3s;

  /* Layout */
  --max-width-container: 700px;
  --min-width-feature: 200px;

  /* Breakpoints */
  --bp-mobile: 768px;
}

/* ============================================
   Reset & Global Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background:
    /* subtle brand glows */
    radial-gradient(60rem 30rem at 15% 10%, rgba(255, 138, 101, 0.08), transparent 60%),
    radial-gradient(40rem 20rem at 85% 20%, rgba(255, 112, 67, 0.06), transparent 60%),

    /* faint grid texture */
    linear-gradient(rgba(255,255,255,0.02) 0.0625rem, transparent 0.0625rem),
    linear-gradient(90deg, rgba(255,255,255,0.02) 0.0625rem, transparent 0.0625rem),

    /* base */
    var(--color-dark);

  background-size:
    auto,
    auto,
    2.5rem 2.5rem,
    2.5rem 2.5rem,
    auto;

  background-attachment: fixed;
  color: var(--color-text-secondary);
  font-family: var(--font-family-base);
  line-height: var(--line-height-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

@media (min-width: 64rem) {
  body {
    background-size:
      auto,
      auto,
      2.25rem 2.25rem,
      2.25rem 2.25rem,
      auto;
  }
}

/* ============================================
   Header & Navigation
   ============================================ */

/* Boxed header background, centered */
.site-header {
  background: var(--color-dark-secondary);
  border-radius: var(--border-radius);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  max-width: var(--max-width-container);
  width: 90%;
  margin: 1rem auto;
  padding: clamp(0.4rem, 1.5vw, 0.75rem) 0;
  display: flex;
  justify-content: center;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 96%;
  max-width: 720px;
}

.logo {
  font-family: var(--font-family-mono);
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: color var(--transition-fast);
}

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

.site-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
}

.hamburger {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 20;
  padding: 0.5rem;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  margin: 4px 0;
  background: #fafafa;
  border-radius: 2px;
  transition: 0.3s;
}

@media (max-width: 768px) {
  .site-header {
    width: 92%;
    border-radius: var(--border-radius);
    margin: 0.75rem auto;
    padding: clamp(0.5rem, 2vw, 0.75rem) 0;
    position: relative;
  }
  .header-content {
    width: 98%;
    max-width: 100%;
  }
  .logo {
    font-size: 1.15rem;
  }
  .site-nav {
    position: absolute;
    top: 60px;
    right: 0;
    left: 0;
    background: var(--color-dark-secondary);
    flex-direction: column;
    align-items: flex-end;
    gap: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    padding: 1rem 1.5rem;
    display: none;
    z-index: 10;
  }
  .site-nav.open {
    display: flex;
  }
  .site-nav a {
    padding: 0.75rem 0;
    width: 100%;
    text-align: right;
    border-bottom: 1px solid var(--color-border);
  }
  .site-nav a:last-child {
    border-bottom: none;
  }
  header .hamburger {
    display: flex !important;
  }
  .hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

.logo {
  font-family: var(--font-family-mono);
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
  transition: color var(--transition-fast);
}

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

nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
}

nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
  border-bottom: 2px solid transparent;
  padding-bottom: var(--spacing-xs);
}

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

/* Hamburger Button */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 0.35rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  align-items: center;
  justify-content: center;
}

.hamburger span {
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-text-secondary);
  transition: all var(--transition-base);
  display: block;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(0.5rem, 0.6rem);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(0.4rem, -0.6rem);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-dark-secondary);
    border: 1px solid var(--color-border);
    border-top: none;
    padding: 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    width: 100%;
  }

  nav.active {
    max-height: 300px;
  }

  nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  nav a:last-child {
    border-bottom: none;
  }

  header {
    position: relative;
    width: 100%;
    margin: 1rem 0;
    flex-wrap: nowrap;
  }
}

/* ============================================
   Main Content
   ============================================ */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-main) clamp(1rem, 5vw, 2rem);
}

.container {
  max-width: var(--max-width-container);
  width: 100%;
}

h1 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  letter-spacing: -1px;
}

.tagline {
  font-size: var(--text-lg);
  color: var(--color-accent);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-section);
  font-family: var(--font-family-mono);
}

.description {
  color: var(--color-text-tertiary);
  font-size: var(--text-base);
  margin-bottom: var(--spacing-section);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   Call-to-Action Section
   ============================================ */
.cta-section {
  display: flex;
  gap: clamp(0.75rem, 3vw, 1.5rem);
  margin-bottom: var(--spacing-section);
  flex-wrap: wrap;
}

.btn {
  padding: clamp(0.5rem, 1.5vw, 0.75rem) clamp(0.75rem, 3vw, 1.5rem);
  border: 1px solid var(--color-accent);
  background: transparent;
  color: var(--color-accent);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-family: var(--font-family-mono);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-block;
}

.btn:hover {
  background: var(--color-accent);
  color: var(--color-dark);
}

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

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

/* ============================================
   Features Grid
   ============================================ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--min-width-feature), 1fr));
  gap: clamp(1rem, 4vw, 2rem);
  margin-bottom: var(--spacing-section);
}

.feature {
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-dark-secondary);
  transition: all var(--transition-base);
}

.feature:hover {
  border-color: var(--color-accent);
  background: var(--color-dark-tertiary);
}

.feature-title {
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-family-mono);
  font-size: clamp(0.8rem, 1.5vw, 0.9rem);
}

.feature-text {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   Footer
   ============================================ */
footer {
  border-top: 1px solid var(--color-border);
  padding: clamp(1.5rem, 4vw, 2rem);
  text-align: center;
  color: var(--color-text-footer);
  font-size: var(--text-sm);
}

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

footer a:hover {
  text-decoration: underline;
}

/* ============================================
   Responsive Design (Mobile)
   ============================================ */
@media (max-width: 768px) {
  h1 {
    letter-spacing: -0.5px;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  nav {
    width: 100%;
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  nav a {
    padding: var(--spacing-sm) 0;
  }

  main {
    padding: var(--spacing-main) var(--spacing-lg);
  }

  .cta-section {
    flex-direction: column;
    gap: var(--spacing-md);
  }

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

  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  header,
  footer {
    display: none;
  }
}