/* ==========================================================================
   base.css — Design tokens, reset, typography, shared utilities
   Colours / fonts / radius yahin se change hote hain.
   ========================================================================== */

:root {
  /* Palette */
  --ink: #06141b;
  --night: #11212d;
  --slate: #253745;
  --steel: #4a5c6a;
  --mist: #9ba8ab;
  --cloud: #ccd0cf;
  --paper: #ffffff;

  /* Semantic */
  --bg: var(--paper);
  --fg: var(--ink);
  --border: color-mix(in srgb, var(--mist) 60%, transparent);

  /* Type */
  --font-heading: "Poppins", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, sans-serif;

  /* Shape + depth */
  --radius: 0.75rem;
  --radius-xl: calc(var(--radius) + 4px);
  --radius-2xl: calc(var(--radius) + 8px);
  --shadow-card: 0 18px 40px -20px color-mix(in srgb, var(--ink) 45%, transparent);

  /* Layout */
  --header-h: 5rem;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid var(--border);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; cursor: pointer; }
input, textarea { font: inherit; color: inherit; }
table { border-collapse: collapse; }

:focus-visible { outline: 2px solid var(--steel); outline-offset: 2px; }

.icon { width: 1.5rem; height: 1.5rem; flex-shrink: 0; }
.icon-sm { width: 1rem; height: 1rem; }

/* ---------- Container (same breakpoints as the original design) ---------- */
.container { width: 100%; margin-inline: auto; padding-inline: 1rem; }
@media (min-width: 640px)  { .container { max-width: 640px; } }
@media (min-width: 768px)  { .container { max-width: 768px; } }
@media (min-width: 1024px) { .container { max-width: 1024px; } }
@media (min-width: 1280px) { .container { max-width: 1280px; } }
@media (min-width: 1536px) { .container { max-width: 1536px; } }
.container--narrow { max-width: 56rem !important; }   /* notices */
.container--text   { max-width: 48rem !important; }   /* legal, FAQ, blog post */

/* ---------- Accessibility helpers ---------- */
.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;
}
.skip-link {
  position: fixed; left: 1rem; top: 1rem; z-index: 60; padding: 0.5rem;
  border-radius: 0.25rem; background: var(--paper); color: var(--ink);
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* ---------- Section backgrounds ---------- */
.bg-paper { background-color: var(--paper); }
.bg-cloud { background-color: var(--cloud); }
.bg-night { background-color: var(--night); color: var(--paper); }
.bg-ink   { background-color: var(--ink);   color: var(--paper); }

.hero-grid {
  background-image:
    radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--steel) 35%, transparent), transparent 45%),
    radial-gradient(circle at 85% 70%, color-mix(in srgb, var(--slate) 70%, transparent), transparent 50%),
    linear-gradient(color-mix(in srgb, var(--mist) 8%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--mist) 8%, transparent) 1px, transparent 1px);
  background-size: auto, auto, 56px 56px, 56px 56px;
}

.section { padding-block: 6rem; }
.section--md { padding-block: 5rem; }
.section--sm { padding-block: 4rem; }

/* ---------- Text helpers ---------- */
.text-steel { color: var(--steel); }
.text-mist  { color: var(--mist); }
.text-center { text-align: center; }

/* ---------- Scroll-reveal (JS adds .reveal; falls back to visible without JS) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: var(--delay, 0s);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Page fade-in ---------- */
main { animation: page-fade 0.4s ease; }
@keyframes page-fade { from { opacity: 0; } to { opacity: 1; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  main { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}