@font-face {
  font-family: 'Fraunces';
  font-style: italic;
  font-weight: 500;
  font-display: swap;
  src: url('fraunces-italic-500.ttf') format('truetype');
}
@font-face {
  font-family: 'Fraunces';
  font-style: italic;
  font-weight: 600;
  font-display: swap;
  src: url('fraunces-italic-600.ttf') format('truetype');
}
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fraunces-normal-500.ttf') format('truetype');
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400;
  font-stretch: normal;
  font-display: swap;
  src: url('ibm-plex-sans-400.ttf') format('truetype');
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 500;
  font-stretch: normal;
  font-display: swap;
  src: url('ibm-plex-sans-500.ttf') format('truetype');
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 600;
  font-stretch: normal;
  font-display: swap;
  src: url('ibm-plex-sans-600.ttf') format('truetype');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('jetbrains-mono-400.ttf') format('truetype');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('jetbrains-mono-500.ttf') format('truetype');
}

  :root {
    /* Warm-toned dark palette — avoids the standard cold blue AI aesthetic */
    --bg:           #100f0d;
    --bg-elev:      #1a1815;
    --bg-elev-2:    #211f1b;
    --border:       #2a2722;
    --border-soft:  #221f1b;
    --text:         #ece7df;
    --text-muted:   #8a8479;
    --text-dim:     #5a554c;

    --user-bg:      #2a2218;      /* warm amber-toned bubble */
    --user-border:  #3a2e1e;
    --asst-bg:      #1a1815;
    --asst-border:  #2a2722;

    --accent:       #d4a35a;      /* warm gold */
    --accent-dim:   #8a6a3a;

    /* 5-color token cycle. Adjacent tokens always sit far apart on the
       color wheel so BPE sub-word boundaries are unmistakable. Yellow is
       lemon, not amber, so it doesn't read as the gold role-marker color. */
    --tok-c0:       rgba( 80,150,225,0.32);  /* blue */
    --tok-c1:       rgba(110,190,140,0.32);  /* green */
    --tok-c2:       rgba(225,110,115,0.32);  /* red */
    --tok-c3:       rgba(230,210, 90,0.30);  /* yellow */
    --tok-c4:       rgba(185,135,225,0.32);  /* purple */
    --tok-role:     rgba(212,163, 90,0.30);
    --tok-mark:     rgba(150,150,180,0.24);

    --danger:       #c66;

    --font-display: 'Fraunces', 'Georgia', serif;
    --font-ui:      'IBM Plex Sans', system-ui, sans-serif;
    --font-mono:    'JetBrains Mono', ui-monospace, monospace;

    --header-h:     56px;
    --inset:        20px;
    --radius:       14px;
    --radius-sm:    8px;
    --safe-bottom:  env(safe-area-inset-bottom, 0px);
    --app-height:   100dvh;
    --visual-top:   0px;
  }

  * { box-sizing: border-box; }
  html, body {
    width: 100%;
    height: 100%;
    min-height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    touch-action: none;
  }
  body {
    margin: 0;
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    overscroll-behavior: none;
    overflow: hidden;
  }

  button, input { font-family: inherit; color: inherit; }

  /* ---- Layout ---- */
  .app {
    position: fixed;
    top: var(--visual-top);
    left: 50%;
    transform: translateX(-50%);
    display: grid;
    grid-template-rows: var(--header-h) 1fr auto;
    width: min(100vw, 880px);
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    height: var(--app-height);
    max-height: var(--app-height);
    min-height: 0;
    max-width: 880px;
    margin: 0;
    border-left: 1px solid var(--border-soft);
    border-right: 1px solid var(--border-soft);
    overflow: hidden;
  }

  /* ---- Header ---- */
  .header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-h);
    padding: 0 var(--inset);
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    z-index: 2;
  }
  .header h1 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-style: italic;
    font-size: 22px;
    letter-spacing: 0.01em;
    color: var(--text);
  }
  .header h1 .ampersand {
    font-weight: 600;
    color: var(--accent);
  }
  .icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    font-family: var(--font-display);
    font-style: italic;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color .15s ease, border-color .15s ease, background .15s ease;
  }
  .icon-btn:hover {
    color: var(--accent);
    border-color: var(--accent-dim);
    background: rgba(212,163,90,0.05);
  }

  /* ---- Chat area ---- */
  .chat-wrap {
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  .chat-scroll {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    touch-action: pan-y;
    padding: 24px var(--inset);
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
  }
  .chat-scroll::-webkit-scrollbar { width: 8px; }
  .chat-scroll::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
  }

  /* Two views layered, toggled via class on root */
  .view-chat, .view-raw { min-height: 100%; }
  .app[data-view="chat"] .view-raw { display: none; }
  .app[data-view="raw"]  .view-chat { display: none; }

  /* ---- Chat view bubbles ---- */
  .msg {
    display: flex;
    margin-bottom: 14px;
    animation: fadein .25s ease;
  }
  .msg.user { justify-content: flex-end; }
  .msg.assistant, .msg.thinking { justify-content: flex-start; }

  .bubble {
    max-width: 78%;
    padding: 10px 14px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 15px;
  }
  .msg.user .bubble {
    background: var(--user-bg);
    border-color: var(--user-border);
    border-bottom-right-radius: 4px;
  }
  .msg.assistant .bubble {
    background: var(--asst-bg);
    border-color: var(--asst-border);
    border-bottom-left-radius: 4px;
  }
  .msg.thinking .bubble {
    background: transparent;
    border: none;
    border-left: 2px solid var(--text-dim);
    border-radius: 0;
    color: var(--text-muted);
    font-style: italic;
    padding: 4px 0 4px 14px;
    font-size: 14px;
  }
  .msg.thinking .bubble::before {
    content: 'thinking';
    display: block;
    font-family: var(--font-display);
    font-style: italic;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-dim);
    margin-bottom: 4px;
  }

  /* Streaming caret on the actively writing bubble */
  .bubble.streaming::after {
    content: '';
    display: inline-block;
    width: 7px;
    height: 14px;
    margin-left: 2px;
    vertical-align: -2px;
    background: var(--accent);
    animation: blink 1s steps(2, start) infinite;
  }
  @keyframes blink { to { visibility: hidden; } }
  @keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

  /* ---- Raw view ---- */
  .view-raw {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.75;
    color: var(--text);
    padding-bottom: 40px;
    /* JetBrains Mono ligatures turn <| and |> into chevrons — we want
       to see the literal special-token characters here. */
    font-variant-ligatures: none;
    font-feature-settings: "liga" 0, "calt" 0;
  }
  /* Per-message wrappers are layout-transparent so the whole conversation
     renders as one continuous token stream — exactly the wire format. */
  .raw-line { display: contents; }
  .tok {
    display: inline;
    padding: 1px 1px;
    border-radius: 2px;
    white-space: pre-wrap;
    word-break: break-word;
  }
  .tok.tok-c0 { background: var(--tok-c0); }
  .tok.tok-c1 { background: var(--tok-c1); }
  .tok.tok-c2 { background: var(--tok-c2); }
  .tok.tok-c3 { background: var(--tok-c3); }
  .tok.tok-c4 { background: var(--tok-c4); }
  /* <|user|>, <|assistant|>, <|end|> — role tokens, gold */
  .tok.tok-role {
    background: var(--tok-role);
    color: var(--accent);
    font-weight: 500;
  }
  /* <think>, </think> — content delimiters, muted lavender */
  .tok.tok-mark {
    background: var(--tok-mark);
    color: #b6afc8;
    font-weight: 500;
  }
  /* Thinking content — same color cycle, dimmed so the section reads as
     secondary while sub-word boundaries stay legible. */
  .tok.tok-think           { color: #a8a4b8; }
  .tok.tok-think.tok-c0    { background: rgba( 80,150,225,0.14); }
  .tok.tok-think.tok-c1    { background: rgba(110,190,140,0.14); }
  .tok.tok-think.tok-c2    { background: rgba(225,110,115,0.14); }
  .tok.tok-think.tok-c3    { background: rgba(230,210, 90,0.13); }
  .tok.tok-think.tok-c4    { background: rgba(185,135,225,0.14); }
  .tok:hover { outline: 1px solid var(--accent-dim); }

  .raw-statusbar {
    position: sticky;
    bottom: 0;
    margin: 0 calc(-1 * var(--inset));
    padding: 6px var(--inset);
    background: var(--bg);
    border-top: 1px solid var(--border-soft);
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-dim);
    display: flex;
    justify-content: space-between;
  }

  /* ---- Input area ---- */
  .input-area {
    border-top: 1px solid var(--border);
    padding: 14px var(--inset) calc(16px + var(--safe-bottom));
    background: var(--bg);
    flex-shrink: 0;
    z-index: 2;
  }
  .input-row {
    position: relative;
  }
  textarea.input {
    width: 100%;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 15px;
    padding: 11px 13px;
    resize: none;
    min-height: 44px;
    line-height: 1.5;
    overflow-y: hidden;       /* JS flips to auto past 5 lines */
    overscroll-behavior: contain;
    touch-action: pan-y;
    transition: border-color .15s ease;
  }
  textarea.input:focus {
    outline: none;
    border-color: var(--accent-dim);
  }
  .controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
    gap: 12px;
  }
  .toggles {
    display: flex;
    gap: 18px;
    color: var(--text-muted);
    font-size: 13px;
    user-select: none;
  }
  .toggle {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    cursor: pointer;
  }
  .toggle input { display: none; }
  .toggle .track {
    width: 30px;
    height: 16px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 9px;
    position: relative;
    transition: background .15s, border-color .15s;
    flex-shrink: 0;
  }
  .toggle .thumb {
    position: absolute;
    left: 1px;
    top: 1px;
    width: 12px;
    height: 12px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: left .18s cubic-bezier(.4,0,.2,1), background .15s;
  }
  .toggle input:checked + .track {
    background: var(--accent);
    border-color: var(--accent);
  }
  .toggle input:checked + .track .thumb {
    left: 15px;
    background: var(--bg);
  }
  .toggle:hover .track { border-color: var(--accent-dim); }

  .send-btn {
    background: var(--accent);
    color: var(--bg);
    border: none;
    border-radius: var(--radius-sm);
    padding: 9px 18px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: background .15s;
    letter-spacing: 0.01em;
  }
  .send-btn:hover:not(:disabled) { background: #e3b46c; }
  .send-btn:disabled {
    background: var(--border);
    color: var(--text-dim);
    cursor: not-allowed;
  }

  /* Disabled state for input region during download */
  .app[data-state="loading"] .input-area,
  .app[data-state="download"] .input-area { opacity: 0.4; pointer-events: none; }

  /* ---- Download screen ---- */
  .download-screen {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px var(--inset);
    height: 100%;
  }
  .app[data-state="download"] .chat-scroll,
  .app[data-state="loading"]  .chat-scroll { display: none; }
  .app[data-state="download"] .download-screen,
  .app[data-state="loading"]  .download-screen { display: flex; }

  .download-screen .title {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 500;
    font-size: 32px;
    margin: 0 0 8px;
    color: var(--text);
  }
  .download-screen .sub {
    color: var(--text-muted);
    max-width: 460px;
    margin: 0 0 24px;
    font-size: 14px;
  }
  .download-actions {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    width: min(100%, 320px);
    margin: 0 auto;
  }
  .download-screen .download-btn {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
    border-radius: var(--radius-sm);
    padding: 11px 22px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background .15s, color .15s;
  }
  .download-screen .download-btn:hover {
    background: var(--accent);
    color: var(--bg);
  }
  .download-screen .download-btn:disabled {
    opacity: 0.5;
    cursor: default;
    pointer-events: none;
  }
  .download-note {
    max-width: 440px;
    margin: 14px 0 0;
    color: var(--text-dim);
    font-size: 13px;
  }
  .progress-wrap {
    display: none;
    width: 320px;
    margin-top: 28px;
  }
  .progress-wrap.active { display: block; }
  .progress-track {
    height: 6px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
  }
  .progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.2s ease;
  }
  .progress-label {
    margin-top: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
  }
  .download-error {
    color: var(--danger);
    font-size: 13px;
    margin-top: 14px;
    font-family: var(--font-mono);
    display: none;
  }

  /* ---- KV cache rebuild status ---- */
  .cache-overlay {
    position: absolute;
    inset: 0;
    z-index: 20;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--inset);
    background: rgba(16,15,13,0.36);
    pointer-events: none;
  }
  .cache-overlay.active { display: flex; }
  .cache-box {
    width: min(100%, 300px);
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elev);
    box-shadow: 0 18px 50px rgba(0,0,0,0.32);
    text-align: center;
  }
  .cache-title {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 18px;
    color: var(--text);
    margin-bottom: 2px;
  }
  .cache-sub {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
  }

  /* ---- Modal ---- */
  .modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(10,9,8,0.85);
    backdrop-filter: blur(6px);
    z-index: 100;
    display: none;
    animation: fadein .2s ease;
  }
  .modal-backdrop.open { display: block; }
  .modal {
    position: fixed;
    top: var(--visual-top);
    left: 50%;
    transform: translateX(-50%);
    width: min(100vw, 880px);
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    height: var(--app-height);
    max-height: var(--app-height);
    z-index: 101;
    display: none;
    flex-direction: column;
    max-width: 880px;
    margin: 0;
    background: var(--bg);
    border-left: 1px solid var(--border-soft);
    border-right: 1px solid var(--border-soft);
  }
  .modal.open { display: flex; }
  .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    padding: 0 var(--inset);
    border-bottom: 1px solid var(--border);
  }
  .tabs { display: flex; gap: 2px; }
  .tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-display);
    font-style: italic;
    font-size: 18px;
    font-weight: 500;
    padding: 8px 14px;
    cursor: pointer;
    border-radius: 4px;
    transition: color .15s;
  }
  .tab:hover { color: var(--text); }
  .tab.active { color: var(--accent); }
  .modal-body {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
    padding: 32px var(--inset) 60px;
  }
  .modal-body::-webkit-scrollbar { width: 8px; }
  .modal-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
  .modal-pane { display: none; max-width: 640px; }
  .modal-pane.active { display: block; }
  .modal-pane h2 {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 500;
    font-size: 26px;
    margin: 0 0 12px;
  }
  .modal-pane h3 {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 17px;
    margin: 24px 0 8px;
    color: var(--accent);
  }
  .modal-pane p { color: var(--text); margin: 0 0 12px; }
  .modal-pane .muted { color: var(--text-muted); font-size: 14px; }
  .modal-pane a {
    color: var(--accent);
    text-decoration-color: var(--accent-dim);
    text-underline-offset: 3px;
  }
  .modal-pane a:hover { color: var(--text); }
  .modal-pane code {
    font-family: var(--font-mono);
    font-size: 13px;
    font-variant-ligatures: none;
    font-feature-settings: "liga" 0, "calt" 0;
    background: var(--bg-elev);
    padding: 1px 5px;
    border-radius: 3px;
    border: 1px solid var(--border-soft);
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .danger-btn {
    margin-top: 10px;
    background: transparent;
    color: var(--danger);
    border: 1px solid rgba(204,102,102,0.55);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s ease, color .15s ease, border-color .15s ease;
  }
  .danger-btn:hover:not(:disabled) {
    background: var(--danger);
    border-color: var(--danger);
    color: var(--bg);
  }
  .danger-btn:disabled {
    opacity: 0.55;
    cursor: default;
  }
  .reset-status {
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
  }
  .spec-table {
    font-family: var(--font-mono);
    font-size: 13px;
    margin-top: 8px;
  }
  .spec-table div {
    display: flex;
    padding: 4px 0;
    border-bottom: 1px solid var(--border-soft);
  }
  .spec-table .k { color: var(--text-muted); width: 160px; }
  .spec-table .v { color: var(--text); }

  /* Hide chat area entirely during pre-init flicker prevention */
  .app[data-state="boot"] .chat-wrap,
  .app[data-state="boot"] .input-area { visibility: hidden; }