/* ==========================================================================
   BASE & TYPOGRAPHY STYLES - ZERO-INLINE CSS SYSTEM (MOBILE BULLETPROOF)
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  min-width: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-app);
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* Images, SVGs and Media Elements never overflow container */
img, svg, video, canvas, audio, iframe, embed, object {
  max-width: 100%;
  height: auto;
}

/* Minimal Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-app);
}

::-webkit-scrollbar-thumb {
  background: var(--zinc-700);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--zinc-500);
}

/* Headings with safe wrapping */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: 1.18;
  letter-spacing: -0.03em;
  overflow-wrap: break-word;
  word-break: break-word;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }

/* Links & Text */
a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
  overflow-wrap: break-word;
}

a:hover {
  color: var(--brand-primary);
}

p {
  overflow-wrap: break-word;
}

/* Code & Preformatted Blocks */
code, kbd, samp, pre {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
}

code {
  padding: 0.2em 0.45em;
  background-color: var(--bg-muted);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  font-weight: var(--font-weight-medium);
  overflow-wrap: break-word;
  word-break: break-word;
}

pre {
  background-color: var(--bg-code);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  color: #e4e4e7;
  line-height: 1.55;
  white-space: pre;
}

pre code {
  padding: 0;
  background: none;
  border: none;
  color: inherit;
  white-space: inherit;
  word-break: normal;
  overflow-wrap: normal;
}

kbd {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  font-size: 0.75rem;
  font-family: var(--font-family-mono);
  color: var(--text-secondary);
  background: var(--bg-muted);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 0 var(--border-strong);
}

/* Layout Utilities (100% Fluid & Mobile-First) */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
  box-sizing: border-box;
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

.section-padding {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

@media (min-width: 768px) {
  .section-padding {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

.section-surface {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 44rem;
  margin: 0 auto var(--space-8);
  width: 100%;
  box-sizing: border-box;
}

.section-header p {
  margin-top: var(--space-2);
}

.text-gradient {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

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

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

.grid-responsive {
  display: grid;
  grid-template-columns: 100%;
  gap: var(--space-4);
  width: 100%;
  max-width: 100%;
}

@media (min-width: 640px) {
  .grid-responsive {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
  }
}

.grid-auto-fit {
  display: grid;
  grid-template-columns: 100%;
  gap: var(--space-4);
  width: 100%;
  max-width: 100%;
}

@media (min-width: 600px) {
  .grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-5);
  }
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--text-primary);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  z-index: 1000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}