/**
 * Alpha Delving — Base Styles & Typography
 * Source: DESIGN.md & DELHI_Delving_BUILD_PLAN.md
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

/* ==========================================================================
   1. CSS RESET
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  max-width: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--type-body-md-size);
  line-height: var(--type-body-md-line-height);
  color: var(--color-on-surface);
  background-color: var(--color-surface-pure);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
  max-width: 100%;
  width: 100%;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   2. TYPOGRAPHY SYSTEM
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-brand-navy);
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: var(--type-display-hero-fluid);
  line-height: 1.15;
  letter-spacing: var(--type-display-hero-letter-spacing);
  font-weight: 800;
}

h2 {
  font-size: var(--type-headline-xl-fluid);
  line-height: 1.2;
  letter-spacing: var(--type-headline-xl-letter-spacing);
}

h3 {
  font-size: var(--type-headline-lg-fluid);
  line-height: 1.25;
  letter-spacing: var(--type-headline-lg-letter-spacing);
}

h4 {
  font-size: var(--type-headline-md-fluid);
  line-height: 1.3;
  letter-spacing: var(--type-headline-md-letter-spacing);
}

h5 {
  font-size: var(--type-headline-sm-fluid);
  line-height: 1.35;
  letter-spacing: var(--type-headline-sm-letter-spacing);
}

p {
  color: var(--color-brand-neutral);
  margin-bottom: 0;
}

p.lead {
  font-size: var(--type-body-lg-size);
  line-height: var(--type-body-lg-line-height);
  color: var(--color-on-surface-variant);
}

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

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

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
}

/* Accessible Focus States */
:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus-ring);
  border-radius: var(--radius-sm);
}

/* Selection Highlight */
::selection {
  background-color: var(--color-primary-fixed);
  color: var(--color-on-primary-fixed);
}