index.css

@import 'tailwindcss';

/* ===================================================================
   Kestrel console - flat dark design tokens (Linear / Raycast lineage)
   ONE structural idea is borrowed from prior work: the topbar and sidebar
   are fused into a single continuous frosted surface, with the content
   pane inset as a bezeled card. Everything else is original.
   Flat: no glossy highlights, no bevels - depth comes from hairline
   borders, not shadows. Restyle by editing these tokens only.
   =================================================================== */
@theme {
  /* surfaces (dark, near-flat) */
  --color-desktop: #0a0908;              /* warm near-black, behind the frosted shell */
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-surface-2: rgba(255, 255, 255, 0.065);
  --color-bezel: #0e0f13;                /* content pane, near-solid for reading */

  /* text, four levels */
  --color-ink: #ededf0;
  --color-ink-2: #b7b8c0;
  --color-ink-3: #8a8b94;
  --color-ink-mute: #5f606a;

  /* hairlines (translucent white; depth without shadow) */
  --color-line: rgba(255, 255, 255, 0.07);
  --color-line-2: rgba(255, 255, 255, 0.11);
  --color-line-3: rgba(255, 255, 255, 0.16);

  /* single accent (copper) - lifted from the design study. warmer + more golden
     than Claude's coral; the only hue in the UI. -deep is for gradient bottoms. */
  --color-accent: #e6a55e;
  --color-accent-2: #f2b877;    /* hover / bright */
  --color-accent-ink: #f7c98d;  /* bright copper on dark */
  --color-accent-deep: #b97a33; /* gradient depth for buttons */

  /* status */
  --color-ok: #3ecf8e;
  --color-warn: #e0a030;
  --color-crit: #e0574b;

  /* radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* frosted shell - concept-grade: translucent enough that the blurred backdrop
     reads through, a top-lighter fill gradient, and a bright-at-top hairline rim
     (drawn by .glass-shell::before). */
  --glass-fill: rgba(20, 22, 30, 0.42);
  --glass-top: rgba(255, 255, 255, 0.055);
  --glass-bot: rgba(255, 255, 255, 0.014);
  --glass-rim-top: rgba(255, 255, 255, 0.18);
  --glass-rim-bot: rgba(255, 255, 255, 0.03);

  /* desktop soft-light glows - mood behind the frosted shell. accent (russet)
     family only (single-hue rule); role-named so a future accent swaps cleanly. */
  --glow-key: rgba(230, 165, 94, 0.16);   /* primary, behind the fused corner */
  --glow-edge: rgba(185, 122, 51, 0.11);  /* down the left edge behind the sidebar */
  --glow-far: rgba(210, 150, 90, 0.06);   /* faint far-corner counterweight */

  /* crisp grid behind the glass: SHARP high-frequency lines are what the frost
     visibly softens - blurring smooth gradients shows nothing. spacing > blur
     radius so the frost stays a quilt instead of averaging to flat grey. */
  --grid-line: rgba(255, 255, 255, 0.05);
  --grid-size: 40px;

  /* type */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Segoe UI Mono',
    Consolas, 'Liberation Mono', monospace;

  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

@layer base {
  * {
    border-color: var(--color-line);
  }
  html {
    font-size: 20px; /* root scale; all rem sizes grow with it */
  }
  html,
  body,
  #root {
    height: 100%;
  }
  body {
    margin: 0;
    color: var(--color-ink);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* the scene the frosted shell blurs: a crisp grid (the SHARP thing), warm
       glows for mood, and a vignette to sink the edges. the grid is what makes
       the frost read - the shell softens its hard lines into a quilt. */
    background-color: var(--color-desktop);
    background-image:
      radial-gradient(125% 125% at 50% 38%, transparent 55%, rgba(0, 0, 0, 0.5)),
      linear-gradient(var(--grid-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
      radial-gradient(92vw 74vh at 20% -12%, var(--glow-key), transparent 60%),
      radial-gradient(54vw 84vh at -12% 42%, var(--glow-edge), transparent 62%),
      radial-gradient(58vw 54vh at 112% 116%, var(--glow-far), transparent 55%);
    background-size:
      auto,
      var(--grid-size) var(--grid-size),
      var(--grid-size) var(--grid-size),
      auto, auto, auto;
    background-attachment: fixed;
  }
  ::selection {
    background: color-mix(in oklch, var(--color-accent) 32%, transparent);
  }
  * {
    scrollbar-width: thin;
    scrollbar-color: var(--color-line-3) transparent;
  }
}

@layer utilities {
  /* the frosted shell: topbar + sidebar live on this ONE surface.
     flat - a single hairline border, no ::after highlight, no inner bevels. */
  .glass-shell {
    position: relative;
    /* translucent fill + top-lighter gradient + a baked SVG grain. the fill is
       kept transparent enough that the blurred grid behind reads through as frost;
       plain backdrop-blur alone looks like translucent plastic - the grain fixes that. */
    background-color: var(--glass-fill);
    background-image:
      linear-gradient(180deg, var(--glass-top), var(--glass-bot)),
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)' opacity='0.05'/%3E%3C/svg%3E");
    background-size: auto, 140px 140px;
    backdrop-filter: blur(28px) saturate(140%);
    -webkit-backdrop-filter: blur(28px) saturate(140%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  }
  /* bright-at-top hairline rim: a masked 1px gradient border. this is the detail
     that reads as a lit glass edge (concept's signature) - subtle, not glossy. */
  .glass-shell::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 1px;
    background: linear-gradient(180deg, var(--glass-rim-top), var(--glass-rim-bot) 55%);
    -webkit-mask:
      linear-gradient(#000 0 0) content-box,
      linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
  }
  /* content pane: near-solid, inset, hairline border - the "bezel" */
  .content-bezel {
    background: var(--color-bezel);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
  }
  /* the design-study card: a translucent gradient pane, lit hairline rim, and a
     soft drop shadow lifting it off the page. used for the approval "main event". */
  .glass-card {
    position: relative;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
    backdrop-filter: blur(28px) saturate(1.3);
    -webkit-backdrop-filter: blur(28px) saturate(1.3);
    box-shadow:
      0 30px 70px -42px rgba(0, 0, 0, 0.85),
      inset 0 1px 0 rgba(255, 255, 255, 0.06);
  }
  .glass-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.03) 55%);
    -webkit-mask:
      linear-gradient(#000 0 0) content-box,
      linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
  }
  .font-mono {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
  }
  .focus-ring:focus-visible {
    outline: none;
    box-shadow:
      0 0 0 2px var(--color-desktop),
      0 0 0 4px color-mix(in oklch, var(--color-accent) 55%, transparent);
    border-radius: var(--radius-sm);
  }
}

/* streaming style (design study): a blinking copper caret while the answer
   streams, and a shimmer sweep on the "Thinking..." label while it reasons.
   both are frozen by the prefers-reduced-motion block below. */
/* streaming caret: rendered as an inline ::after on the LAST block of the
   markdown so it sits right after the final character (not on its own line
   below). `.stream-caret` is toggled on the wrapper only while streaming. */
.stream-caret .md > :last-child::after {
  content: '';
  display: inline-block;
  width: 7px;
  height: 1.05em;
  margin-left: 2px;
  vertical-align: -2px;
  border-radius: 1px;
  background: var(--color-accent);
  box-shadow: 0 0 8px color-mix(in oklch, var(--color-accent) 55%, transparent);
  animation: caret-blink 1s steps(2) infinite;
}
@keyframes caret-blink {
  50% {
    opacity: 0;
  }
}
.shimmer {
  background: linear-gradient(
    90deg,
    var(--color-ink-mute) 30%,
    var(--color-ink-2) 50%,
    var(--color-ink-mute) 70%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 1.8s linear infinite;
}
@keyframes shimmer {
  to {
    background-position: -200% 0;
  }
}

/* markdown: neutralize the inline-code chip when it sits inside a fenced block
   (unlayered, so it wins over the utility classes on the code element) */
.md pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  border-radius: 0;
  font-size: inherit;
}

/* mobile: backdrop-filter is a per-frame GPU cost; drop it, use a solid fill */
@media (max-width: 767px) {
  .glass-shell {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(16, 17, 21, 0.96);
  }
  body {
    background-attachment: scroll;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}