/* ============================================================
   PREP.SUPPLY — Design System
   Foundation: variables, reset, typography, spacing, utilities
   Owner: Keel (shared — changes require Podium agreement)
   ============================================================ */

/* === Font Loading === */
@import url('https://fonts.googleapis.com/css2?family=Bitter:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Inter:wght@400;500;600&display=swap');

/* === Design Tokens === */
:root {
  /* Primary neutrals — warm stone palette */
  --color-stone:        #3d3a36;
  --color-timber:       #6b5e4f;
  --color-fog:          #e8e4de;
  --color-cloud:        #f5f2ec;
  --color-white:        #faf8f5;

  /* Accent — lantern amber: preparedness as warmth */
  --color-lantern:      #c8913a;
  --color-lantern-dim:  #a67628;
  --color-lantern-glow: #f5e6cc;

  /* Functional — accessible, no red/green reliance */
  --color-water:        #3d6a7a;   /* links, interactive */
  --color-alert:        #b85c3a;   /* urgent callouts — burnt orange, NOT red */
  --color-safe:         #4a7a5e;   /* confirmation — muted forest, value-contrast safe */

  /* Typography */
  --font-display:   'Bitter', Georgia, 'Times New Roman', serif;
  --font-body:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:      'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Type scale — 1.25 ratio, base 17px */
  --text-xs:    0.8rem;     /* ~13.6px */
  --text-sm:    0.9rem;     /* ~15.3px */
  --text-base:  1rem;       /* 17px */
  --text-lg:    1.25rem;    /* ~21px */
  --text-xl:    1.563rem;   /* ~26.5px */
  --text-2xl:   1.953rem;   /* ~33px */
  --text-3xl:   2.441rem;   /* ~41.5px */
  --text-4xl:   3.052rem;   /* ~52px */

  /* Line heights */
  --leading-tight:    1.2;
  --leading-snug:     1.35;
  --leading-normal:   1.6;
  --leading-relaxed:  1.75;

  /* Spacing — 8px base unit */
  --space-1:   0.5rem;    /* 8px */
  --space-2:   1rem;      /* 16px */
  --space-3:   1.5rem;    /* 24px */
  --space-4:   2rem;      /* 32px */
  --space-5:   2.5rem;    /* 40px */
  --space-6:   3rem;      /* 48px */
  --space-8:   4rem;      /* 64px */
  --space-10:  5rem;      /* 80px */
  --space-12:  6rem;      /* 96px */
  --space-16:  8rem;      /* 128px */

  /* Layout */
  --content-width:     42rem;   /* ~714px — optimal reading width */
  --page-width:        72rem;   /* ~1224px — max page width */
  --nav-height:        4rem;
  --sticky-header-offset: var(--nav-height);

  /* Transitions */
  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
  --duration:   0.3s;
}

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

html {
  font-size: 106.25%;  /* 17px base */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-stone);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-water);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  text-decoration-thickness: 1px;
  transition: color var(--duration) var(--ease-out);
}

a:hover {
  color: var(--color-lantern-dim);
}

ul, ol {
  padding-left: 1.5em;
}

/* === Typography === */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--color-stone);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.015em;
}

h3 {
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-3);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
}

blockquote {
  border-left: 3px solid var(--color-lantern);
  padding-left: var(--space-3);
  margin: var(--space-4) 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
  color: var(--color-timber);
}

small, .text-sm {
  font-size: var(--text-sm);
}

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

.text-center {
  text-align: center;
}

/* === Layout === */

.container {
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.content-width {
  max-width: var(--content-width);
  margin: 0 auto;
}

.section {
  padding: var(--space-10) 0;
}

.section-lg {
  padding: var(--space-12) 0;
}

/* === Scroll Reveal === */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

/* === Utility === */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* === Responsive === */

@media (max-width: 1024px) {
  :root {
    --text-4xl: 2.5rem;
    --text-3xl: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
    --text-2xl: 1.5rem;
  }

  html {
    font-size: 100%; /* 16px base on mobile */
  }

  .container {
    padding: 0 var(--space-2);
  }

  .section {
    padding: var(--space-8) 0;
  }

  .section-lg {
    padding: var(--space-10) 0;
  }
}

@media (max-width: 480px) {
  :root {
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
  }
}