/* ============================================================
   base.css — Reset, Foundation, Typography, Accessibility
   Premium AI Intelligence Platform
   ============================================================ */

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

/* CRITICAL: Preserve JavaScript hide/show functionality */
[hidden] {
  display: none !important;
}

html {
  min-height: 100%;
  background: var(--bg-base);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) var(--bg-base);
}

/* Custom Scrollbar for Webkit */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-full);
  border: 2px solid var(--bg-base);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-gold);
}

body {
  min-height: 100%;
  position: relative;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  font-weight: var(--fw-regular);
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  transition: background var(--t-base) var(--ease-out),
              color var(--t-base) var(--ease-out);
}

/* ────────── PREMIUM AMBIENT LIGHTING ────────── */
/* Radial gradient bloom effect - creates depth */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 50% 0%, var(--gold-wash) 0%, transparent 50%),
    radial-gradient(circle at 0% 100%, var(--blue-wash) 0%, transparent 40%),
    radial-gradient(circle at 100% 100%, var(--emerald-wash) 0%, transparent 40%);
  opacity: 0.6;
  animation: ambientPulse 20s ease-in-out infinite;
}

@keyframes ambientPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

/* ────────── SELECTION ────────── */
::selection {
  background: var(--gold);
  color: var(--bg-base);
  text-shadow: none;
}

::-moz-selection {
  background: var(--gold);
  color: var(--bg-base);
}

/* ────────── TYPOGRAPHY ────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 0;
}

h1 {
  font-size: var(--fs-display);
  font-weight: var(--fw-heavy);
}

h2 {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
}

h3 {
  font-size: var(--fs-title);
  font-weight: var(--fw-semibold);
}

p {
  margin: 0;
  line-height: var(--lh-relaxed);
}

a {
  color: var(--gold);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease-out);
}

a:hover {
  color: var(--gold-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

b, strong {
  font-weight: var(--fw-bold);
  color: var(--text-primary);
}

/* Monospaced numbers for data */
.mono, code, kbd, 
[class*="num"],
[class*="count"],
[class*="stat"] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

code {
  background: var(--bg-surface);
  padding: 2px 6px;
  border-radius: var(--r-xs);
  font-size: 0.9em;
}

/* ────────── ACCESSIBILITY ────────── */
/* Focus styles for keyboard navigation */
:where(button, a, select, input, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* Screen reader only content */
.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;
}

/* Make data tables and results selectable */
.chip, .item, .stat, .drawpanel, table, pre, .selectable {
  -webkit-user-select: text;
  user-select: text;
}

/* ────────── UTILITY CLASSES ────────── */
.small {
  font-size: var(--fs-small);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
}

.dim {
  color: var(--text-secondary);
}

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

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: var(--fw-semibold);
}

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

/* ────────── LOADING PRIMITIVES ────────── */
/* Premium skeleton loaders */
.skel {
  display: block;
  border-radius: var(--r-sm);
  background: linear-gradient(
    90deg,
    var(--skeleton-from) 25%,
    var(--skeleton-to) 50%,
    var(--skeleton-from) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 2s ease-in-out infinite;
}

.skel + .skel {
  margin-top: var(--s2);
}

.skel.line {
  height: 14px;
  border-radius: var(--r-xs);
}

.skel.line.short {
  width: 40%;
}

.skel.line.mid {
  width: 65%;
}

.skel.line.long {
  width: 85%;
}

.skel.title {
  height: 24px;
  width: 50%;
  margin-bottom: var(--s3);
  border-radius: var(--r-sm);
}

.skel.block {
  height: 80px;
  border-radius: var(--r-md);
}

.skel.chip {
  height: 48px;
  border-radius: var(--r-sm);
}

.skel.card {
  height: 200px;
  border-radius: var(--r-lg);
}

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

/* Premium spinner for buttons */
.spin {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-right-color: transparent;
  display: inline-block;
  vertical-align: middle;
  animation: rotate 0.8s linear infinite;
}

@keyframes rotate {
  to {
    transform: rotate(360deg);
  }
}

/* Loading pulse for live elements */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ────────── ICONS ────────── */
.ico {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}

.ico.sm {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
}

.ico.lg {
  width: 32px;
  height: 32px;
  stroke-width: 1.75;
}

.ico.xl {
  width: 40px;
  height: 40px;
  stroke-width: 1.5;
}

/* ────────── MOTION RESPECT ────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  body::before {
    animation: none;
  }
}

/* ────────── HIGH CONTRAST MODE ────────── */
@media (prefers-contrast: more) {
  :root {
    --text-secondary: #D4D4D8;
    --text-tertiary: #A1A1AA;
    --border-default: rgba(255, 255, 255, 0.15);
    --border-strong: rgba(255, 255, 255, 0.25);
  }
}

/* ────────── PRINT STYLES ────────── */
@media print {
  body::before {
    display: none;
  }
  
  * {
    box-shadow: none !important;
    text-shadow: none !important;
  }
}

/* App-like behaviour: no pinch-zoom, no long-press text callout, no
   double-tap zoom, no overscroll bounce. The in-app A/A+/A++ button
   still works — it scales font tokens, not the viewport. Inputs remain
   selectable so people can copy/paste numbers. */
body { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
input, textarea, .cr-num, .tm-num, [data-selectable] {
  -webkit-user-select: text; user-select: text;
}

/* ============================================================
   NATIVE-FEEL LOCKS — make the TWA stop behaving like a web page,
   WITHOUT touching scroll. (Scroll setup is the authoritative block
   at the end of this file — do not add overflow/touch-action here.)
   ============================================================ */
body {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;      /* no long-press image/link menu */
  -webkit-tap-highlight-color: transparent;
}
/* but DO allow selecting real content the user may want to copy */
input, textarea, .selectable, .cr-num, .tm-num, output, code {
  -webkit-user-select: text;
  user-select: text;
}

/* ============================================================
   SCROLL — simplest correct setup: let the whole document scroll
   naturally like a normal web page. Do NOT put overflow-y:auto on
   BOTH html and body — two scroll containers confuse mobile Chrome
   and break touch-scroll (the long-standing scroll bug). Only the
   document (html) scrolls; body just flows.
   ============================================================ */
html {
  height: auto;
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior-y: contain;   /* blocks pull-to-refresh; does NOT block scroll */
  -webkit-overflow-scrolling: touch;
}
body {
  height: auto;
  min-height: 100%;
  overflow: visible;         /* NOT a scroll container — html scrolls */
  position: static;          /* position:relative on body can pin scroll on some WebViews */
  touch-action: auto;        /* let the browser handle scroll gestures natively */
}
#appView { min-height: 100%; height: auto; overflow: visible; }
main { overflow: visible; height: auto; }