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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

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

/* ─── Typography ─── */
h1, h2, h3 {
  font-family: var(--font-display);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
  font-weight: 600;
}

h4, h5, h6 {
  font-family: var(--font-body);
  line-height: var(--leading-tight);
  letter-spacing: -0.01em;
  font-weight: 600;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

@media (min-width: 640px) {
  h1 { font-size: var(--text-5xl); }
  h2 { font-size: var(--text-4xl); }
}

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

strong { font-weight: 600; }

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }

.font-tabular { font-variant-numeric: tabular-nums; }

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* ─── Selection ─── */
::selection {
  background: var(--accent);
  color: #ffffff;
}

/* ─── Focus ─── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─── Animations ─── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

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

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

@keyframes wordReveal {
  from {
    opacity: 0;
    transform: translateY(24px);
    filter: blur(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
  100% { transform: translate(0, 0) scale(1); }
}

@keyframes staggerFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-out) both;
}

.animate-fade-in-up {
  animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

.animate-slide-in-up {
  animation: slideInUp var(--duration-slow) var(--ease-out) both;
}

/* Staggered delays */
.delay-1 { animation-delay: 80ms; }
.delay-2 { animation-delay: 160ms; }
.delay-3 { animation-delay: 240ms; }
.delay-4 { animation-delay: 320ms; }
.delay-5 { animation-delay: 400ms; }
.delay-6 { animation-delay: 480ms; }
.delay-7 { animation-delay: 560ms; }
.delay-8 { animation-delay: 640ms; }

/* ─── Skeleton Loading ─── */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton--text {
  height: 1em;
  border-radius: var(--radius-sm);
}

.skeleton--card {
  height: 120px;
}

.skeleton--chart {
  height: 320px;
}

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--gray-900);
  color: white;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  z-index: var(--z-toast);
  pointer-events: none;
  opacity: 0;
  transition: all var(--duration-slow) var(--ease-out);
}

.toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ─── Screen reader only ─── */
.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;
}

/* ─── Hidden ─── */
[hidden] { display: none !important; }