/* Unified chat interface — the only UI surface in the product.
 *
 * Three rules govern everything below.
 *
 * 1. Contrast belongs in the reading column, not the furniture. Separators are
 *    hairlines, surfaces differ by a few percent of lightness, and nothing in
 *    the chrome is boxed unless the box carries meaning. Grouping is done with
 *    a faint fill rather than a border wherever a fill will do.
 * 2. One spatial rhythm: every gap, pad and control height is a multiple of
 *    4px, and the type runs on a fixed scale (11 / 12 / 13 / 14 / 15 / 17 /
 *    21 / 28) with tracking tightening as the size grows.
 * 3. Motion is a state change, never a flourish: 120–160ms, ease-out, opacity
 *    and colour only.
 */

:root {
    color-scheme: light;

    /* Surfaces. Each step is a few percent darker than the one above it, so
       stacking two of them reads as depth without a line between them. */
    --bg: #ffffff;
    --bg-subtle: #fbfbfc;
    --bg-sunken: #f4f4f6;
    --bg-hover: #f0f0f3;
    /* Anything that floats above the page: cards, popovers, the composer. In
       light this is plain white and a hairline does the separating; in dark it
       is a step lighter than the page, because dark surfaces gain elevation by
       getting brighter, not by casting a shadow nobody can see. */
    --bg-raised: #ffffff;

    /* Separators: hairlines, not rules. */
    --border: #ededf0;
    --border-strong: #e0e0e5;

    /* Text. */
    --text: #18181b;
    --text-muted: #70707a;
    --text-faint: #a1a1aa;

    --accent: #18181b;
    --accent-hover: #2c2c33;
    --accent-text: #ffffff;
    --knob: #ffffff;

    --focus: #4f46e5;
    --focus-ring: 0 0 0 3px rgba(79, 70, 229, 0.16);
    --link: #4f46e5;

    --danger: #b42318;
    --danger-bg: #fdf4f3;
    --danger-border: #f6dedb;
    --ok: #067647;

    /* Soft accent used by @mention chips. */
    --tint-bg: #eef1fe;
    --tint-text: #4338ca;

    --ins-bg: #dcfae6;
    --del-bg: #fee4e2;

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;

    /* Shadows carry lift, never outline. Anything that needs an edge gets a
       hairline; the shadow only says "this floats". */
    --shadow-sm: 0 1px 2px rgba(18, 18, 23, 0.04);
    --shadow: 0 1px 2px rgba(18, 18, 23, 0.04), 0 8px 24px -14px rgba(18, 18, 23, 0.16);
    --shadow-lg: 0 1px 3px rgba(18, 18, 23, 0.06), 0 16px 48px -16px rgba(18, 18, 23, 0.20);

    --scrim: rgba(24, 24, 27, 0.32);

    --sidebar-width: 260px;
    --column: 720px;

    --ease: cubic-bezier(0.2, 0, 0, 1);

    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;

        --bg: #0b0b0d;
        --bg-subtle: #111114;
        --bg-sunken: #1a1a1f;
        --bg-hover: #212127;
        --bg-raised: #161619;

        --border: #232329;
        --border-strong: #30303a;

        --text: #f2f2f4;
        --text-muted: #a1a1ac;
        --text-faint: #71717c;

        /* Inverted: the primary control is light on a dark ground. */
        --accent: #f2f2f4;
        --accent-hover: #ffffff;
        --accent-text: #131316;
        --knob: #8e8e99;

        --focus: #8b8bf5;
        --focus-ring: 0 0 0 3px rgba(139, 139, 245, 0.22);
        --link: #a5a5f8;

        --danger: #f97066;
        --danger-bg: #21100f;
        --danger-border: #40201d;
        --ok: #47cd89;

        --tint-bg: #23234a;
        --tint-text: #c7c7fb;

        --ins-bg: #123122;
        --del-bg: #3a1b18;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 8px 24px -14px rgba(0, 0, 0, 0.8);
        --shadow-lg: 0 1px 3px rgba(0, 0, 0, 0.5), 0 16px 48px -16px rgba(0, 0, 0, 0.9);

        --scrim: rgba(0, 0, 0, 0.55);
    }
}

* { box-sizing: border-box; }

/* Several rules below set display on elements toggled with the hidden
   attribute, which would otherwise win. */
[hidden] { display: none !important; }

html, body {
    margin: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

button { font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; }

.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.icon {
    width: 18px;
    height: 18px;
    flex: none;
    display: block;
    stroke-width: 1.6;
}

/* Focus: one ring everywhere, offset so it never crops a glyph. The outline
   inherits each element's own corner radius, so nothing is restyled on focus —
   setting a radius here would visibly reshape controls as you tab through. */
:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
}

/* Thin, unobtrusive scrollbars — the default chunky grey bar is the loudest
   thing on an otherwise quiet page. */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border: 3px solid transparent;
    border-radius: 999px;
    background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover { background: var(--text-faint); background-clip: content-box; }

::selection { background: var(--tint-bg); color: var(--tint-text); }

/* ---------- shared controls ---------- */

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-faint);
    text-decoration: none;
    transition: background 0.12s var(--ease), color 0.12s var(--ease);
}

.icon-btn .icon { width: 16px; height: 16px; }
.icon-btn:hover { background: var(--bg-hover); color: var(--text); }

.ghost-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 28px;
    padding: 0 10px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    transition: background 0.12s var(--ease), color 0.12s var(--ease);
}

.ghost-btn .icon { width: 15px; height: 15px; }
.ghost-btn:hover { background: var(--bg-hover); color: var(--text); }

.app { display: flex; height: 100dvh; overflow: hidden; background: var(--bg); }

/* ---------- sidebar ---------- */

.sidebar {
    width: var(--sidebar-width);
    flex: 0 0 var(--sidebar-width);
    border-right: 1px solid var(--border);
    background: var(--bg-subtle);
    display: flex;
    flex-direction: column;
    min-height: 0;
    transition: margin-left 0.2s var(--ease);
}

.app.sidebar-collapsed .sidebar { margin-left: calc(-1 * var(--sidebar-width)); }

.sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    flex: none;
    padding: 0 12px 0 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    border-radius: var(--radius-sm);
    text-decoration: none;
    opacity: 0.92;
    transition: opacity 0.12s var(--ease);
}

.brand:hover { opacity: 1; }
.brand img { width: 22px; height: 22px; border-radius: 6px; display: block; }

.sidebar-top { padding: 0 12px 4px; display: flex; flex-direction: column; gap: 4px; }

/* The only outlined control in the sidebar, so it reads as the one thing to
   press without needing a fill. */
.new-chat {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    height: 34px;
    padding: 0 10px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--bg-raised);
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    transition: background 0.12s var(--ease), border-color 0.12s var(--ease);
}

.new-chat .icon { width: 15px; height: 15px; color: var(--text-muted); }
.new-chat:hover { background: var(--bg-hover); border-color: var(--border-strong); }

/* Chromeless until it is used: no box, no fill, just the field. */
.sidebar-search {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 32px;
    padding: 0 10px;
    border-radius: var(--radius);
    color: var(--text-faint);
    transition: background 0.12s var(--ease), box-shadow 0.12s var(--ease);
}

.sidebar-search .icon { width: 15px; height: 15px; }
.sidebar-search:hover { background: var(--bg-hover); }

.sidebar-search:focus-within {
    background: var(--bg-raised);
    box-shadow: var(--focus-ring);
    color: var(--text-muted);
}

.sidebar-search input {
    flex: 1;
    min-width: 0;
    border: 0;
    background: none;
    outline: none;
    font: inherit;
    font-size: 13px;
    color: var(--text);
}

.sidebar-search input::placeholder { color: var(--text-faint); }
.sidebar-search input::-webkit-search-cancel-button { display: none; }

.conversations {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 8px 12px 16px;
}

.group-label {
    padding: 16px 8px 6px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.conversations > .group-label:first-child { padding-top: 8px; }

.conv {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 30px;
    padding: 0 4px 0 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-muted);
    transition: background 0.12s var(--ease), color 0.12s var(--ease);
}

.conv:hover { background: var(--bg-hover); color: var(--text); }
.conv.active { background: var(--bg-hover); color: var(--text); }
.conv.active .title { font-weight: 500; }

.conv .title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
}

.conv .icon-btn { width: 22px; height: 22px; opacity: 0; }
.conv .icon-btn .icon { width: 14px; height: 14px; }
.conv:hover .icon-btn, .conv .icon-btn:focus-visible { opacity: 1; }

.sidebar-foot {
    flex: none;
    border-top: 1px solid var(--border);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.foot-link {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    height: 32px;
    padding: 0 8px;
    border: 0;
    border-radius: var(--radius-sm);
    background: none;
    text-align: left;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 13px;
    transition: background 0.12s var(--ease), color 0.12s var(--ease);
}

.foot-link .icon { width: 16px; height: 16px; }
.foot-link:hover { background: var(--bg-hover); color: var(--text); }

.foot-count {
    margin-left: auto;
    min-width: 18px;
    padding: 0 5px;
    border-radius: 999px;
    background: var(--bg-sunken);
    font-size: 11px;
    font-weight: 500;
    line-height: 18px;
    text-align: center;
    color: var(--text-muted);
}

.foot-link.account { height: 44px; gap: 10px; margin-top: 2px; }

.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    flex: none;
    border-radius: 50%;
    background: var(--bg-sunken);
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.foot-link.account:hover .avatar { background: var(--accent); color: var(--accent-text); }

.account-text { min-width: 0; display: block; }

.account-name {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text);
    font-size: 13px;
    line-height: 1.35;
}

.account-meta {
    display: block;
    font-size: 11px;
    color: var(--text-faint);
    line-height: 1.35;
}

.sidebar-scrim { display: none; }

/* ---------- main ---------- */

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 52px;
    padding: 0 12px 0 16px;
    flex: none;
}

/* The sidebar carries its own collapse control, so the topbar's expand button is
   only meaningful once the sidebar is gone. */
#expand-sidebar { display: none; }
.app.sidebar-collapsed #expand-sidebar { display: inline-flex; }

.conv-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
}

.topbar-actions { display: flex; align-items: center; gap: 2px; }

.stage { flex: 1; min-height: 0; display: flex; }

.thread { flex: 1; min-width: 0; display: flex; flex-direction: column; min-height: 0; }

.stage-divider { width: 1px; background: var(--border); flex: none; }

/* ---------- transcript ---------- */

.transcript { flex: 1; min-height: 0; overflow-y: auto; scroll-behavior: smooth; }
.transcript:has(> .empty) { display: flex; }

.transcript-inner {
    width: 100%;
    max-width: var(--column);
    margin: 0 auto;
    padding: 24px 24px 8px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    font-size: 15px;
    line-height: 1.68;
}

.msg { display: flex; flex-direction: column; gap: 12px; }
.msg.user { align-items: flex-end; }

.msg.user .bubble {
    max-width: 78%;
    padding: 10px 16px;
    border-radius: 16px;
    background: var(--bg-sunken);
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.msg.assistant .bubble { max-width: 100%; }

.bubble > :first-child { margin-top: 0; }
.bubble > :last-child { margin-bottom: 0; }

.bubble h1, .bubble h2, .bubble h3, .bubble h4 {
    margin: 1.7em 0 0.6em;
    font-weight: 600;
    line-height: 1.3;
}

.bubble h1 { font-size: 1.4em; letter-spacing: -0.021em; }
.bubble h2 { font-size: 1.2em; letter-spacing: -0.016em; }
.bubble h3 { font-size: 1.05em; letter-spacing: -0.011em; }
.bubble h4 { font-size: 1em; letter-spacing: -0.006em; }

.bubble p { margin: 0 0 1em; }
.bubble ul, .bubble ol { margin: 0 0 1em; padding-left: 1.35em; }
.bubble li { margin: 0.3em 0; padding-left: 0.15em; }
.bubble li > ul, .bubble li > ol { margin: 0.3em 0 0; }
.bubble li::marker { color: var(--text-faint); font-size: 0.92em; }
.bubble strong { font-weight: 600; }

.bubble a {
    color: var(--link);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    text-decoration-color: color-mix(in srgb, var(--link) 35%, transparent);
    transition: text-decoration-color 0.12s var(--ease);
}

.bubble a:hover { text-decoration-color: currentColor; }

.bubble hr { margin: 1.8em 0; border: 0; border-top: 1px solid var(--border); }

.bubble blockquote {
    margin: 0 0 1em;
    padding-left: 16px;
    border-left: 2px solid var(--border-strong);
    color: var(--text-muted);
}

.bubble code {
    font-family: var(--mono);
    font-size: 0.86em;
    padding: 0.15em 0.4em;
    border-radius: 5px;
    background: var(--bg-sunken);
}

/* Code sits in a filled well rather than an outlined box: one fewer line on
   the page, and the fill already says "not prose". */
.bubble pre {
    margin: 0 0 1em;
    padding: 14px 16px;
    border-radius: var(--radius);
    background: var(--bg-sunken);
    overflow-x: auto;
}

.bubble pre code {
    padding: 0;
    background: none;
    font-size: 13px;
    line-height: 1.6;
}

/* Horizontal hairlines only — no outer frame, no vertical rules, cells flush
   with the text column so the table sits inside the prose instead of on it. */
.bubble table {
    width: 100%;
    margin: 0.4em 0 1.2em;
    border-collapse: collapse;
    font-size: 14px;
    line-height: 1.5;
}

.bubble th, .bubble td {
    padding: 9px 16px 9px 0;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.bubble th {
    padding-bottom: 7px;
    border-bottom: 1px solid var(--border-strong);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.bubble th:last-child, .bubble td:last-child { padding-right: 0; }
.bubble tbody tr:last-child td { border-bottom: 0; }

.cursor {
    display: inline-block;
    width: 2px;
    height: 1.05em;
    margin-left: 2px;
    border-radius: 1px;
    vertical-align: -0.18em;
    background: var(--text);
    animation: blink 1.1s steps(2, start) infinite;
}

@keyframes blink { to { visibility: hidden; } }

/* ---------- empty state ---------- */

.empty {
    margin: auto;
    width: 100%;
    max-width: var(--column);
    padding: 24px 24px 40px;
    text-align: center;
}

.empty h1 {
    margin: 0 0 8px;
    font-size: clamp(25px, 2.5vw, 30px);
    font-weight: 600;
    letter-spacing: -0.028em;
    line-height: 1.2;
}

.empty p {
    margin: 0 auto 32px;
    max-width: 52ch;
    font-size: 15px;
    line-height: 1.55;
    color: var(--text-muted);
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    text-align: left;
}

.suggestion {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 14px 34px 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-raised);
    text-align: left;
    transition: background 0.14s var(--ease), border-color 0.14s var(--ease);
}

.suggestion:hover { background: var(--bg-subtle); border-color: var(--border-strong); }

/* A chevron that only appears on hover: the affordance is there when wanted
   and absent from the resting composition. */
.suggestion::after {
    content: "";
    position: absolute;
    top: 19px;
    right: 16px;
    width: 6px;
    height: 6px;
    border-top: 1.5px solid var(--text-faint);
    border-right: 1.5px solid var(--text-faint);
    transform: rotate(45deg) translate(-2px, 2px);
    opacity: 0;
    transition: opacity 0.14s var(--ease), transform 0.14s var(--ease);
}

.suggestion:hover::after { opacity: 1; transform: rotate(45deg) translate(0, 0); }

.suggestion strong { font-size: 14px; font-weight: 550; letter-spacing: -0.006em; }
.suggestion span { font-size: 13px; color: var(--text-muted); line-height: 1.45; }

/* ---------- activity, plan, notices ---------- */

/* Grouped by fill, not by outline, and sized to its content so a finished run
   collapses to a chip rather than a band across the column. */
.activity {
    width: fit-content;
    max-width: 100%;
    border-radius: var(--radius);
    background: var(--bg-sunken);
    font-size: 13px;
}

.activity summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    cursor: pointer;
    color: var(--text-muted);
    list-style: none;
    border-radius: var(--radius);
    transition: color 0.12s var(--ease);
}

.activity summary:hover { color: var(--text); }
.activity summary::-webkit-details-marker { display: none; }
.activity summary > span { flex: 1; min-width: 0; }

.activity summary::after {
    content: "";
    width: 6px;
    height: 6px;
    flex: none;
    margin-right: 3px;
    border-bottom: 1.5px solid currentColor;
    border-right: 1.5px solid currentColor;
    transform: rotate(-45deg) translate(-1px, -1px);
    opacity: 0.65;
    transition: transform 0.16s var(--ease);
}

.activity[open] summary::after { transform: rotate(45deg) translate(-1px, -1px); }
.activity .steps { padding: 2px 12px 12px; display: flex; flex-direction: column; gap: 8px; }

/* One step is one line: a fixed status slot, the tool name at its natural
   width, then the live detail taking whatever is left and ellipsing. The name
   must never be the thing that wraps — "load tools" breaking into "load" /
   "tools" is what makes a run log read as debug output. */
.step {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    color: var(--text-muted);
    line-height: 1.45;
}

.step .icon, .step .spinner { width: 14px; height: 14px; flex: none; }
.step .icon { color: var(--ok); }

.step .name {
    flex: none;
    white-space: nowrap;
    font-weight: 500;
    color: var(--text);
}

/* The JS hands us "document search"; a capital makes it interface copy rather
   than a function signature. */
.step .name::first-letter { text-transform: uppercase; }

.step .detail {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 12px;
    color: var(--text-faint);
}

.step .detail:not(:empty)::before {
    content: "·";
    margin-right: 6px;
    color: var(--border-strong);
}

/* A failed step reads as one red line, not a red icon beside black text. */
.step.error, .step.error .name, .step.error .detail { color: var(--danger); }
.step.error .icon { color: var(--danger); }
.step.error .detail::before { color: currentColor; opacity: 0.5; }

.spinner {
    width: 14px;
    height: 14px;
    flex: none;
    border: 1.5px solid var(--border-strong);
    border-top-color: var(--text-muted);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.plan {
    padding-left: 16px;
    border-left: 1px solid var(--border-strong);
    font-size: 14px;
}

.plan ol { margin: 0; padding-left: 1.2em; color: var(--text-muted); }
.plan li { margin: 0.25em 0; }
.plan li::marker { color: var(--text-faint); }
.plan li.done { color: var(--text-faint); text-decoration: line-through; }
.plan li.current { color: var(--text); font-weight: 500; }

.notice {
    padding: 11px 14px;
    border: 1px solid var(--danger-border);
    border-radius: var(--radius);
    background: var(--danger-bg);
    color: var(--danger);
    font-size: 14px;
}

.question {
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-raised);
}

.question .q { font-weight: 500; margin-bottom: 12px; font-size: 14px; }
.question .options { display: flex; flex-wrap: wrap; gap: 6px; }

.question .option {
    height: 30px;
    padding: 0 14px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--bg-raised);
    font-size: 13px;
    transition: background 0.12s var(--ease), border-color 0.12s var(--ease);
}

.question .option:hover { background: var(--bg-sunken); border-color: var(--text-faint); }

/* ---------- attachments and artifacts ---------- */

.attachments { display: flex; flex-wrap: wrap; gap: 8px; }

.attachment, .artifact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 340px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-raised);
    text-align: left;
    color: inherit;
}

.artifact-card { cursor: pointer; transition: background 0.14s var(--ease), border-color 0.14s var(--ease); }
.artifact-card:hover { background: var(--bg-subtle); border-color: var(--border-strong); }

.attachment-glyph, .artifact-card-glyph {
    width: 30px;
    height: 30px;
    padding: 7px;
    flex: none;
    border-radius: 8px;
    background: var(--bg-sunken);
    color: var(--text-muted);
}

.attachment .meta, .artifact-card .meta { min-width: 0; flex: 1; }

.attachment .name, .artifact-card .name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.35;
}

.attachment .sub, .artifact-card .sub {
    font-size: 12px;
    color: var(--text-faint);
    line-height: 1.4;
}

.attachment-actions { display: flex; gap: 2px; }
.artifact-card-chevron { width: 15px; height: 15px; color: var(--text-faint); }
.artifact-card:hover .artifact-card-chevron { color: var(--text-muted); }

.inline-image-btn { padding: 0; border: 0; background: none; border-radius: var(--radius); }

.inline-image {
    max-width: 100%;
    max-height: 380px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: block;
}

/* ---------- artifact panel ---------- */

.artifact {
    width: min(46vw, 620px);
    flex: none;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--bg);
}

.artifact-head {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 52px;
    padding: 0 10px 0 20px;
    border-bottom: 1px solid var(--border);
    flex: none;
}

.artifact-kind {
    padding: 3px 7px;
    border-radius: var(--radius-sm);
    background: var(--bg-sunken);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    line-height: 1;
    color: var(--text-muted);
    text-transform: uppercase;
}

.artifact-kind:empty { display: none; }

.artifact-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
    font-weight: 500;
}

.artifact-actions { display: flex; gap: 2px; }
.artifact-body { flex: 1; min-height: 0; overflow: auto; background: var(--bg); }
.artifact-frame { width: 100%; height: 100%; border: 0; display: block; }
.artifact-image { display: block; margin: 24px auto; max-width: calc(100% - 48px); }

.artifact-html {
    max-width: 720px;
    margin: 0 auto;
    padding: 32px 28px 48px;
    font-size: 15px;
    line-height: 1.65;
}

.artifact-html > :first-child { margin-top: 0; }

.artifact-html h1, .artifact-html h2, .artifact-html h3 {
    margin: 1.6em 0 0.5em;
    font-weight: 600;
    line-height: 1.25;
}

.artifact-html h1 { font-size: 1.5em; letter-spacing: -0.024em; }
.artifact-html h2 { font-size: 1.2em; letter-spacing: -0.016em; }
.artifact-html h3 { font-size: 1.05em; letter-spacing: -0.01em; }
.artifact-html p { margin: 0 0 1em; }
.artifact-html ul, .artifact-html ol { margin: 0 0 1em; padding-left: 1.35em; }

.artifact-html table {
    border-collapse: collapse;
    width: 100%;
    margin: 0.4em 0 1.2em;
    font-size: 14px;
}

.artifact-html td, .artifact-html th {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}

.artifact-html th { background: var(--bg-subtle); font-weight: 600; }
.artifact-html ins { background: var(--ins-bg); text-decoration: none; }
.artifact-html del { background: var(--del-bg); }

/* ---------- composer ---------- */

.composer-wrap { flex: none; padding: 8px 24px 24px; }

.composer {
    position: relative;
    width: 100%;
    max-width: var(--column);
    margin: 0 auto;
    padding: 10px 10px 8px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    background: var(--bg-raised);
    box-shadow: var(--shadow);
    transition: border-color 0.14s var(--ease), box-shadow 0.14s var(--ease);
}

.composer:focus-within {
    border-color: var(--text-faint);
    box-shadow: var(--shadow-lg);
}

.composer.dragover { border-color: var(--focus); box-shadow: var(--focus-ring); }

.composer-input {
    max-height: 260px;
    overflow-y: auto;
    padding: 5px 6px 3px;
    outline: none;
    font-size: 15px;
    line-height: 1.6;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.composer-input.is-empty::before {
    content: attr(data-placeholder);
    color: var(--text-faint);
    pointer-events: none;
}

.mention {
    display: inline-block;
    padding: 1px 7px;
    margin: 0 1px;
    border-radius: 6px;
    background: var(--tint-bg);
    color: var(--tint-text);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    white-space: nowrap;
    user-select: all;
}

.composer-actions { display: flex; align-items: center; gap: 4px; padding-top: 6px; }
.composer-actions .spacer { flex: 1; }

.send-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    color: var(--accent-text);
    transition: background 0.12s var(--ease), color 0.12s var(--ease);
}

.send-btn .icon { width: 17px; height: 17px; stroke-width: 2; }
.send-btn:hover:not(:disabled) { background: var(--accent-hover); }
.send-btn:disabled { background: var(--bg-sunken); color: var(--text-faint); cursor: default; }
.send-btn.stop .icon { fill: currentColor; stroke-width: 1.5; }

.pending-files { display: flex; flex-wrap: wrap; gap: 6px; padding: 2px 6px 8px; }

.pending-file {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 26px;
    padding: 0 3px 0 9px;
    border-radius: 999px;
    background: var(--bg-sunken);
    font-size: 12px;
    color: var(--text-muted);
}

.pending-file .icon { width: 14px; height: 14px; }
.pending-file .icon-btn { width: 20px; height: 20px; }
.pending-file .icon-btn .icon { width: 13px; height: 13px; }
.pending-file .icon-btn:hover { background: var(--bg-hover); }

.pending-name {
    max-width: 190px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---------- mention popup ---------- */

.mention-popup {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(100% + 10px);
    max-height: 306px;
    overflow-y: auto;
    padding: 6px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-raised);
    box-shadow: var(--shadow-lg);
    z-index: 30;
    animation: pop 0.14s var(--ease);
}

@keyframes pop { from { opacity: 0; transform: translateY(4px); } }

.mention-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.1s var(--ease);
}

.mention-item.active { background: var(--bg-hover); }

.mention-glyph {
    width: 28px;
    height: 28px;
    padding: 6px;
    flex: none;
    border-radius: 7px;
    background: var(--bg-sunken);
    color: var(--text-muted);
}

.mention-item.active .mention-glyph { background: var(--bg-raised); color: var(--text); }
.mention-item > div { min-width: 0; }
.mention-item .label { font-size: 14px; font-weight: 500; line-height: 1.35; }

.mention-item .desc {
    font-size: 12px;
    color: var(--text-faint);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---------- connectors drawer ---------- */

.drawer-backdrop {
    position: fixed;
    inset: 0;
    background: var(--scrim);
    display: flex;
    justify-content: flex-end;
    z-index: 60;
    animation: fade 0.16s var(--ease);
}

@keyframes fade { from { opacity: 0; } }

/* A floating sheet rather than a full-bleed panel: the inset and the radius
   keep it reading as an object over the app, not a second application. */
.drawer {
    width: min(420px, 100%);
    margin: 12px 12px 12px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-raised);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: slide 0.2s var(--ease);
}

@keyframes slide { from { transform: translateX(16px); opacity: 0; } }

.drawer-head {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    flex: none;
    padding: 20px 12px 16px 20px;
    border-bottom: 1px solid var(--border);
}

.drawer-heading { flex: 1; min-width: 0; }

.drawer-heading h2 {
    margin: 0;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.015em;
    line-height: 1.3;
}

.drawer-heading p { margin: 4px 0 0; font-size: 13px; line-height: 1.45; color: var(--text-muted); }
.drawer-body { flex: 1; overflow-y: auto; padding: 8px 12px 16px; }

.connector-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius);
    transition: background 0.12s var(--ease);
}

.connector-row:hover { background: var(--bg-subtle); }

.connector-glyph {
    width: 32px;
    height: 32px;
    padding: 8px;
    flex: none;
    border-radius: 8px;
    background: var(--bg-sunken);
    color: var(--text-muted);
}

.connector-row .info { flex: 1; min-width: 0; }
.connector-row .label { font-size: 14px; font-weight: 550; line-height: 1.4; }
.connector-row .desc { margin-top: 1px; font-size: 13px; color: var(--text-muted); line-height: 1.45; }
.connector-row .count { margin-top: 6px; font-size: 11px; color: var(--text-faint); }

.switch {
    position: relative;
    width: 34px;
    height: 20px;
    flex: none;
    margin-top: 6px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: var(--border-strong);
    transition: background 0.16s var(--ease);
}

.switch::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--knob);
    box-shadow: 0 1px 2px rgba(18, 18, 23, 0.2);
    transition: transform 0.16s var(--ease);
}

.switch.on { background: var(--accent); }
.switch.on::after { transform: translateX(14px); background: var(--accent-text); }

/* ---------- responsive ---------- */

@media (max-width: 1100px) {
    .artifact { width: min(52vw, 560px); }
}

@media (max-width: 860px) {
    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 70;
        margin-left: calc(-1 * var(--sidebar-width));
        box-shadow: var(--shadow-lg);
    }

    .app.sidebar-open .sidebar { margin-left: 0; }

    /* On a phone the sidebar is an overlay, so the topbar control is the only
       way back to it whatever the collapsed preference says. */
    #expand-sidebar { display: inline-flex; }

    .app.sidebar-open .sidebar-scrim {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 65;
        background: var(--scrim);
    }

    .topbar { padding-left: 8px; padding-right: 8px; }
    .transcript-inner { padding: 16px 16px 8px; gap: 20px; }
    .composer-wrap { padding: 8px 12px 16px; }
    .empty { padding: 16px 16px 40px; }
    .suggestions { grid-template-columns: 1fr; }
    .msg.user .bubble { max-width: 88%; }

    .drawer { margin: 0; border: 0; border-radius: 0; width: 100%; }

    /* The panel takes the screen; the thread is one swipe away behind it. */
    .app.with-artifact .thread, .app.with-artifact .stage-divider { display: none; }
    .artifact { width: 100%; }
    .artifact-html { padding: 24px 20px 40px; }
}

@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
    .transcript { scroll-behavior: auto; }
    .spinner { animation: spin 0.7s linear infinite !important; }
}