/* Blue Labs: Body Language — Layered & Nested OKLCH Relative Color Theme Engine */
@layer reset, tokens, themes, layout, components, overlays, utilities;

@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  html, body {
    height: 100%;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
  }
}

@layer themes {
  /* 1. Futuristic Sci-Fi Medicine (Default) */
  :root,
  [data-theme="future-medicine"] {
    --theme-luminance: 0.20;
    --theme-chroma: 0.07;
    --theme-hue: 247;
    --accent-hue: 192;
  }

  /* 2. Black Cat (Obsidian & Feline Amber) */
  [data-theme="black-cat"] {
    --theme-luminance: 0.14;
    --theme-chroma: 0.03;
    --theme-hue: 285;
    --accent-hue: 78;
  }

  /* 3. Forestry (Deep Pine & Moss Canopy) */
  [data-theme="forestry"] {
    --theme-luminance: 0.22;
    --theme-chroma: 0.06;
    --theme-hue: 148;
    --accent-hue: 115;
  }

  /* Color Mode Overrides: Light, Dark, or Device-Driven */
  [data-color-mode="light"] {
    --mode-l-shift: 0.72;
    --text-l-target: 0.18;
  }

  [data-color-mode="dark"] {
    --mode-l-shift: 0.0;
    --text-l-target: 0.94;
  }

  [data-color-mode="device"] {
    --mode-l-shift: 0.0;
    --text-l-target: 0.94;
    @media (prefers-color-scheme: light) {
      --mode-l-shift: 0.72;
      --text-l-target: 0.18;
    }
  }
}

@layer tokens {
  :root {
    --base-color: oklch(
      calc(var(--theme-luminance) + var(--mode-l-shift, 0))
      var(--theme-chroma)
      var(--theme-hue)
    );

    --surface-bg: oklch(from var(--base-color) l c h);
    --surface-elevated: oklch(from var(--surface-bg) calc(l + 0.06) c h);
    --surface-glass: oklch(from var(--surface-elevated) l c h / 0.78);
    --surface-border: oklch(from var(--surface-bg) calc(l + 0.18) calc(c + 0.04) h / 0.45);

    --text-primary: oklch(from var(--surface-bg) var(--text-l-target, 0.94) calc(c * 0.25) h);
    --text-muted: oklch(from var(--text-primary) calc(l - 0.25) c h);

    --accent-primary: oklch(0.74 0.16 var(--accent-hue));
    --accent-glow: oklch(from var(--accent-primary) l c h / 0.35);

    --table-background-color: oklch(from var(--surface-elevated) l c h);
    --table-row-background-color-odd: oklch(from var(--table-background-color) calc(l + 0.04) c h);
    --table-row-background-color-even: oklch(from var(--table-background-color) calc(l - 0.03) c h);

    --status-ok: oklch(0.75 0.17 152);
    --status-warn: oklch(0.80 0.17 84);
    --status-danger: oklch(0.66 0.21 28);
  }
}

@layer layout {
  body.hud-shell {
    background-color: var(--surface-bg);
    color: var(--text-primary);
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100dvh;
    overflow-x: hidden;

    & > header.hud-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 1.25rem;
      background: var(--surface-glass);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--surface-border);
      position: sticky;
      top: 0;
      z-index: 30;

      & .brand-cluster {
        display: flex;
        align-items: center;
        gap: 0.85rem;

        & .brand-title-stack {
          display: flex;
          flex-direction: column;
          line-height: 1.05;
        }

        & .brand-title {
          font-size: 1.1rem;
          font-weight: 700;
          letter-spacing: 0.06em;
          text-transform: uppercase;
          color: var(--accent-primary);
        }

        & .brand-version {
          font-size: 0.62rem;
          font-weight: 500;
          letter-spacing: 0.08em;
          color: var(--text-muted);
          font-variant-numeric: tabular-nums;
          margin-top: 0.14rem;
        }
      }

      & .header-right-cluster {
        display: flex;
        align-items: center;
        gap: 1rem;
      }
    }

    & > .hud-workspace {
      display: grid;
      grid-template-columns: 220px 1fr;
      gap: 1rem;
      padding: 1rem 1.25rem;

      @media (max-width: 860px) {
        grid-template-columns: 1fr;
      }

      & > nav.hud-nav {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
        background: var(--surface-elevated);
        border: 1px solid var(--surface-border);
        border-radius: 0.75rem;
        padding: 0.75rem;

        & a.nav-item {
          color: var(--text-primary);
          text-decoration: none;
          padding: 0.6rem 0.8rem;
          border-radius: 0.5rem;
          font-size: 0.92rem;
          transition: background 150ms ease;

          &:hover, &[aria-current="page"] {
            background: oklch(from var(--accent-primary) l c h / 0.18);
            color: var(--accent-primary);
          }
        }
      }

      & > main.hud-main {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 1rem;
        align-content: start;
      }
    }

    & > footer.hud-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.6rem 1.25rem;
      font-size: 0.8rem;
      color: var(--text-muted);
      border-top: 1px solid var(--surface-border);
      background: var(--surface-elevated);
    }
  }
}

@layer components {
  .hud-card {
    background: var(--surface-elevated);
    border: 1px solid var(--surface-border);
    border-radius: 0.85rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: 0 8px 24px oklch(0 0 0 / 0.22);

    &.span-full {
      grid-column: 1 / -1;
    }

    & .card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--surface-border);
      padding-bottom: 0.5rem;

      & h2 {
        font-size: 0.95rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--accent-primary);
      }
    }

    & .metric-readout {
      font-size: 2.2rem;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
    }
  }

  /* Vertical Tri-Dot Kebab Trigger */
  button.kebab-trigger {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.35rem 0.5rem;
    border-radius: 0.4rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;

    &:hover {
      background: oklch(from var(--surface-bg) calc(l + 0.12) c h);
      border-color: var(--surface-border);
    }
  }

  /* Google Docs-Style Presence Avatar Ring */
  .presence-strip {
    display: flex;
    align-items: center;

    & .presence-avatar {
      width: 2rem;
      height: 2rem;
      border-radius: 999px;
      border: 2px solid var(--accent-primary);
      background: var(--surface-elevated);
      color: var(--text-primary);
      font-size: 0.78rem;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-left: -0.45rem;
      box-shadow: 0 0 10px var(--accent-glow);
    }
  }

  /* User Profile Avatar & Key Expiry Badge */
  .profile-avatar-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;

    & .expiry-badge {
      position: absolute;
      top: -4px;
      right: -4px;
      background: var(--status-warn);
      color: oklch(0.15 0.02 240);
      font-size: 0.7rem;
      font-weight: 800;
      padding: 0.05rem 0.35rem;
      border-radius: 999px;

      &[data-state="expired"] {
        background: var(--status-danger);
        color: white;
      }
    }
  }

  /* Pulsing Undulating Horizontal Tri-Dot Activity Indicator */
  .tri-dot-activity {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: oklch(from var(--accent-primary) l c h / 0.14);
    border: 1px solid var(--surface-border);

    &[hidden] {
      display: none !important;
    }

    & .dot {
      width: 0.48rem;
      height: 0.48rem;
      border-radius: 50%;
      background: var(--accent-primary);
      will-change: transform, opacity;
    }
  }

  /* Data Table Using Derived OKLCH Odd/Even Rows */
  table.hud-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;

    & th, & td {
      padding: 0.55rem 0.75rem;
      text-align: left;
    }

    & tbody tr:nth-child(odd) {
      background-color: var(--table-row-background-color-odd);
    }

    & tbody tr:nth-child(even) {
      background-color: var(--table-row-background-color-even);
    }
  }

  #three-twin-viewport {
    width: 100%;
    height: 360px;
    border-radius: 0.65rem;
    background: radial-gradient(
      circle at center,
      oklch(from var(--accent-primary) calc(l * 0.35) calc(c * 0.6) h / 0.35),
      transparent 75%
    );
    position: relative;
  }
}

@layer overlays {
  /* Non-full-page containers open as an overlay with a blurred scrim */
  dialog.hud-overlay {
    margin: auto;
    background: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--surface-border);
    border-radius: 1rem;
    padding: 1.5rem;
    max-width: 540px;
    width: calc(100% - 2rem);
    box-shadow: 0 24px 64px oklch(0 0 0 / 0.55);

    &::backdrop {
      background: oklch(from var(--surface-bg) calc(l * 0.4) c h / 0.62);
      backdrop-filter: blur(14px);
    }

    & .overlay-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--surface-border);
    }
  }
}