/* ==========================================================================
   Base — reset, typography, focus, utilities
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh);
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 100% -10%, var(--bg-accent-1), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, var(--bg-accent-2), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv11", "ss01";
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--border); margin: var(--sp-5) 0; }
p { margin: 0 0 var(--sp-3); }
ul, ol { margin: 0; padding-left: 1.25rem; }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
legend { padding: 0; }
[hidden] { display: none !important; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 650;
  line-height: var(--lh-tight);
  letter-spacing: -.01em;
  color: var(--text);
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }
h5, h6 { font-size: var(--fs-base); }

code, kbd, pre { font-family: var(--font-mono); font-size: .9em; }
kbd {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 1.6em; padding: 1px 6px;
  border: 1px solid var(--border-strong); border-bottom-width: 2px;
  border-radius: 5px; background: var(--surface-2); color: var(--text-2);
  font-size: var(--fs-2xs);
}

::selection { background: rgba(18, 165, 235, .25); }

/* Focus — visible for keyboard users only */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-track { background: transparent; }

/* Accessibility helpers */
.sr-only {
  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: -60px; z-index: 200;
  padding: var(--sp-2) var(--sp-4); border-radius: var(--radius-sm);
  background: var(--primary); color: #fff; font-weight: 600;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--sp-3); text-decoration: none; }

/* ------------------------------------------------------------- utilities */
.muted { color: var(--text-3); }
.text-2 { color: var(--text-2); }
.small { font-size: var(--fs-sm); }
.xsmall { font-size: var(--fs-xs); }
.strong { font-weight: 600; }
.mono { font-family: var(--font-mono); }
.nowrap { white-space: nowrap; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.pre-wrap { white-space: pre-wrap; word-break: break-word; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-success { color: var(--success-text); }
.text-danger { color: var(--danger-text); }
.text-warning { color: var(--warning-text); }
.text-primary { color: var(--primary-text); }

.row { display: flex; align-items: center; gap: var(--sp-3); }
.row-wrap { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.col { display: flex; flex-direction: column; gap: var(--sp-3); }
.stack-1 > * + * { margin-top: var(--sp-1); }
.stack-2 > * + * { margin-top: var(--sp-2); }
.stack-3 > * + * { margin-top: var(--sp-3); }
.stack-4 > * + * { margin-top: var(--sp-4); }
.stack-6 > * + * { margin-top: var(--sp-6); }
.grow { flex: 1 1 auto; min-width: 0; }
.shrink-0 { flex-shrink: 0; }
.gap-1 { gap: var(--sp-1); } .gap-2 { gap: var(--sp-2); } .gap-4 { gap: var(--sp-4); } .gap-6 { gap: var(--sp-6); }
.mt-0 { margin-top: 0; } .mt-2 { margin-top: var(--sp-2); } .mt-4 { margin-top: var(--sp-4); } .mt-6 { margin-top: var(--sp-6); }
.mb-0 { margin-bottom: 0; } .mb-2 { margin-bottom: var(--sp-2); } .mb-4 { margin-bottom: var(--sp-4); } .mb-6 { margin-bottom: var(--sp-6); }
.ml-auto { margin-left: auto; }
.w-full { width: 100%; }

.grid { display: grid; gap: var(--sp-5); }
.grid-2 { display: grid; gap: var(--sp-5); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { display: grid; gap: var(--sp-5); grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { display: grid; gap: var(--sp-5); grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-auto { display: grid; gap: var(--sp-5); grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.grid-main-side { display: grid; gap: var(--sp-5); grid-template-columns: minmax(0, 2fr) minmax(300px, 1fr); }
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-main-side { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 860px) {
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .hide-sm { display: none !important; }
}
@media (min-width: 561px) { .show-sm { display: none !important; } }

/* Entrance animation for cards and page sections */
@keyframes fade-up { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes shimmer { 0% { background-position: -400px 0; } 100% { background-position: 400px 0; } }
.anim-in { animation: fade-up var(--dur-slow) var(--ease-out) both; }
.anim-in:nth-child(2) { animation-delay: 40ms; }
.anim-in:nth-child(3) { animation-delay: 80ms; }
.anim-in:nth-child(4) { animation-delay: 120ms; }
.anim-in:nth-child(5) { animation-delay: 160ms; }
.anim-in:nth-child(6) { animation-delay: 200ms; }
@media (prefers-reduced-motion: reduce) { .anim-in { animation: none; } }
:root[data-motion="reduced"] .anim-in { animation: none; }

/* Print */
@media print {
  body { background: #fff !important; color: #000; }
  .no-print, .sidebar, .topbar, .toast-stack { display: none !important; }
  .app-main { margin: 0 !important; padding: 0 !important; }
  .card { box-shadow: none !important; border: 1px solid #ddd !important; backdrop-filter: none !important; background: #fff !important; }
}