/* ==========================================================================
   HyperMesh Research — Editorial Design System
   Matches DESIGN.md & Current Robotics warm-paper archival aesthetics
   ========================================================================== */

:root {
  --canvas-base: #FAF8F5;
  --surface-subtle: #F4F0EA;
  --surface-container: #efeeeb;
  --surface-container-high: #eae8e5;
  --surface-container-highest: #e4e2df;
  --surface-container-lowest: #ffffff;
  --border-hairline: #EAE6DF;
  --border-strong: #D4CECA;
  --text-primary: #18181B;
  --text-muted: #71717A;
  --text-dim: #A1A1AA;
  --accent-live: #EF4444;

  --font-serif: "Source Serif 4", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

@layer base {
  html,
  body {
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    background-color: var(--canvas-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    overscroll-behavior: none;
  }

  main > :first-child {
    margin-top: 0 !important;
  }

  main > :last-child {
    margin-bottom: 0 !important;
  }
}

/* Custom subtle scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 9999px;
}

/* Editorial typography enforcement */
.font-display,
.font-headline-lg,
.font-headline-lg-mobile,
.font-headline-md {
  font-family: var(--font-serif) !important;
  font-feature-settings: "lnum" 1, "tnum" 1;
}

.font-body-lg,
.font-body-md,
.font-body-sm,
.font-headline-sm,
.font-title-md,
.font-label-caps,
.font-label-code {
  font-family: var(--font-sans);
}

/* Pure CSS SVG icon helpers matching Material Symbols sizing */
.icon-svg {
  display: inline-block;
  flex-shrink: 0;
  vertical-align: middle;
}

/* Smooth page entrance */
.page-fade-in {
  animation: pageFadeIn 0.28s ease-out;
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile drawer transition */
.mobile-drawer {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.mobile-drawer.is-closed {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}

.mobile-drawer.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* Benchmark card subtle transition */
.metric-value-fade {
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.metric-value-fade.is-updating {
  opacity: 0.35;
  transform: translateY(2px);
}

/* Hairline academic table precision */
.paper-table {
  border-collapse: collapse;
  width: 100%;
}

.paper-table th,
.paper-table td {
  border-bottom: 1px solid var(--border-hairline);
  text-align: left;
  padding: 0.9rem 1rem;
}

.paper-table th {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Toast feedback banner */
.toast-banner {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 90;
  background-color: var(--text-primary);
  color: var(--canvas-base);
  padding: 0.75rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  box-shadow: 0 14px 30px -10px rgba(24, 24, 27, 0.28);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast-banner.show {
  opacity: 1;
  transform: translateY(0);
}