/* ============================================================
   FORMULAGENIE — RESET & BASE
   Production CSS — base.css
   ============================================================ */

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

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

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar        { width: 5px; height: 5px; }
::-webkit-scrollbar-track  { background: transparent; }
::-webkit-scrollbar-thumb  { background: var(--border-strong); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── Selection ──────────────────────────────────────────── */
::selection {
  background: var(--blue-200);
  color: var(--text-primary);
}

/* ── Focus Visible (accessibility) ─────────────────────── */
:focus-visible {
  outline: 2px solid var(--blue-600);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ── Typography base ────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--weight-extrabold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

p {
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
}

code, pre, kbd {
  font-family: var(--font-mono);
}

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

/* ── Utility: container ─────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (max-width: 640px) {
  .container {
    padding-inline: var(--space-4);
  }
}

/* ── Animations ─────────────────────────────────────────── */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulseGlow {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

@keyframes shimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(16px) scale(0.95); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
}

/* ── Helpers ────────────────────────────────────────────── */
.animate-spin    { animation: spin 0.75s linear infinite; }
.animate-fade-up { animation: fadeUp 0.22s ease forwards; }
.animate-fade-in { animation: fadeIn 0.18s ease forwards; }