/* ============================================================
   Purna Foundation — base
   Design tokens, reset, typography, layout primitives.
   Mobile-first: unprefixed rules are the phone layout,
   min-width queries scale up.
   ============================================================ */

/* ---- 1. Tokens ------------------------------------------- */
:root {
  /* Brand palette, sampled from the corporate profile */
  --navy:          #14274E;
  --navy-deep:     #0E1B36;
  --navy-soft:     #E7EBF3;
  --saffron:       #F07C22;
  --saffron-dark:  #D9660F;   /* AA-safe on white for links/small text */
  --saffron-soft:  #FDEEE1;
  --green:         #1B7A4B;
  --green-deep:    #135C39;
  --green-soft:    #E8F3ED;
  --red:           #D32027;

  /* Neutrals */
  --ink:           #1F2937;
  --ink-soft:      #4B5563;
  --muted:         #6B7280;
  --line:          #E5E7EB;
  --bg:            #F4F5F7;
  --surface:       #FFFFFF;

  /* Typography */
  --font-display:  'Archivo Black', 'Inter', system-ui, sans-serif;
  --font-serif:    'Playfair Display', Georgia, serif;
  --font-body:     'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-script:   'Dancing Script', cursive;
  --font-deva:     'Noto Sans Devanagari', 'Inter', sans-serif;

  /* Fluid type scale (1.25 ratio) */
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-md:   clamp(1.05rem, 0.98rem + 0.35vw, 1.175rem);
  --fs-lg:   clamp(1.25rem, 1.12rem + 0.6vw, 1.5rem);
  --fs-xl:   clamp(1.5rem, 1.28rem + 1.1vw, 2rem);
  --fs-2xl:  clamp(1.85rem, 1.45rem + 2vw, 2.75rem);
  --fs-3xl:  clamp(2.25rem, 1.6rem + 3.2vw, 3.75rem);
  --fs-4xl:  clamp(2.75rem, 1.7rem + 5vw, 5rem);

  /* Spacing */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;   --sp-3: 0.75rem;
  --sp-4: 1rem;     --sp-5: 1.5rem;   --sp-6: 2rem;
  --sp-7: 3rem;     --sp-8: 4rem;     --sp-9: 6rem;
  --section-y: clamp(3.5rem, 2rem + 6vw, 6.5rem);

  /* Shape */
  --r-sm: 6px;   --r-md: 12px;   --r-lg: 20px;   --r-xl: 28px;
  --r-pill: 999px;

  /* Elevation */
  --sh-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --sh-md: 0 4px 8px -2px rgba(16, 24, 40, 0.08), 0 12px 24px -6px rgba(16, 24, 40, 0.10);
  --sh-lg: 0 12px 20px -8px rgba(16, 24, 40, 0.12), 0 28px 56px -12px rgba(16, 24, 40, 0.18);

  /* Layout */
  --container: 1200px;
  --container-narrow: 820px;
  --gutter: clamp(1.15rem, 0.6rem + 2.4vw, 2.5rem);
  --header-h: 72px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.4s;
}

/* ---- 2. Reset -------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }

ul, ol { list-style: none; padding: 0; }

a { color: var(--saffron-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--navy); }

:focus-visible {
  outline: 3px solid var(--saffron);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Hidden sprite host */
.svg-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ---- 3. Typography --------------------------------------- */
h1, h2, h3, h4 { line-height: 1.15; font-weight: 700; color: var(--navy); }

.display {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.02;
  text-transform: uppercase;
}

.serif { font-family: var(--font-serif); font-weight: 700; }
.script { font-family: var(--font-script); font-weight: 600; }

.lead {
  font-size: var(--fs-md);
  color: var(--ink-soft);
  line-height: 1.75;
}

p + p { margin-top: var(--sp-4); }

/* Devanagari needs a different face and more vertical room. */
:lang(hi), .hi, [data-lang='hi'] body { font-family: var(--font-deva); }

[data-lang='hi'] body { line-height: 1.8; }
[data-lang='hi'] .display { font-family: var(--font-deva); font-weight: 800; letter-spacing: 0; line-height: 1.25; }
[data-lang='hi'] .serif   { font-family: var(--font-deva); }
[data-lang='hi'] .script  { font-family: var(--font-deva); font-style: normal; }
[data-lang='hi'] .u-track { letter-spacing: 0; }

/* Text that stays in its own script regardless of UI language */
.is-devanagari { font-family: var(--font-deva); }
.is-latin      { font-family: var(--font-body); }

/* ---- 4. Layout primitives -------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * 0.65); }
.section--bg     { background: var(--surface); }
.section--tint   { background: var(--navy-soft); }
.section--saffron{ background: var(--saffron-soft); }
.section--green  { background: var(--green-soft); }

.grid { display: grid; gap: var(--sp-5); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---- 5. Utilities ---------------------------------------- */
.u-center { text-align: center; }
.u-mx-auto { margin-inline: auto; }
.u-mt-4 { margin-top: var(--sp-4); }
.u-mt-5 { margin-top: var(--sp-5); }
.u-mt-6 { margin-top: var(--sp-6); }
.u-mt-7 { margin-top: var(--sp-7); }
.u-track { letter-spacing: 0.14em; text-transform: uppercase; }

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

.skip-link {
  position: absolute;
  left: var(--sp-4); top: -100px;
  z-index: 999;
  background: var(--navy);
  color: #fff;
  padding: var(--sp-3) var(--sp-5);
  border-radius: 0 0 var(--r-md) var(--r-md);
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0; color: #fff; }

[hidden] { display: none !important; }

/* ---- 6. Reveal on scroll --------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}