/* AI-Debate — Classical design system tokens and components (Cormorant Garamond + Lora, warm near-white ground, gold stroke accent, outlined buttons). */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;600&family=Lora:wght@400;600&display=swap');

:root {
  --color-bg: #f3f2f2;
  --color-surface: #eae9e9;
  --color-text: #201f1d;
  --color-accent: #b68235;
  --color-accent-2: #ac803e;
  --color-accent-contrast: #ffffff;
  --color-divider: color-mix(in srgb, #201f1d 16%, transparent);

  --color-neutral-100: #f8f4f4;
  --color-neutral-200: #eae7e7;
  --color-neutral-300: #d7d3d3;
  --color-neutral-400: #bab6b6;
  --color-neutral-500: #9b9797;
  --color-neutral-600: #7d7979;
  --color-neutral-700: #605d5d;
  --color-neutral-800: #444141;
  --color-neutral-900: #2d2b2b;

  --color-accent-100: #fff3e4;
  --color-accent-200: #ffe3bf;
  --color-accent-300: #facb8d;
  --color-accent-400: #e1ad66;
  --color-accent-500: #c28d41;
  --color-accent-600: #a06f24;
  --color-accent-700: #7d5411;
  --color-accent-800: #5a3b0a;
  --color-accent-900: #3a270d;

  --color-accent-2-100: #fff3e4;
  --color-accent-2-200: #ffe3be;
  --color-accent-2-300: #f5cd96;
  --color-accent-2-400: #dbaf70;
  --color-accent-2-500: #bc8f4e;
  --color-accent-2-600: #9b7232;
  --color-accent-2-700: #79561f;
  --color-accent-2-800: #573d14;
  --color-accent-2-900: #382810;

  --font-heading: "Cormorant Garamond", system-ui, serif;
  --font-heading-weight: 600;
  --font-body: "Lora", system-ui, serif;

  --space-1: 4.6px;
  --space-2: 9.2px;
  --space-3: 13.8px;
  --space-4: 18.4px;
  --space-6: 27.6px;
  --space-8: 36.8px;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 7px;

  --shadow-sm: 0 1px 2px color-mix(in srgb, #2d2b2b 14%, transparent);
  --shadow-md: 0 3px 10px color-mix(in srgb, #2d2b2b 16%, transparent);
  --shadow-lg: 0 12px 32px color-mix(in srgb, #2d2b2b 22%, transparent);
}

/* Dark theme — a colophon page: deep warm near-black ground, gold stays the stroke accent. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #201c17;
    --color-surface: #2a251e;
    --color-text: #efe9e0;
    --color-accent: #d4a054;
    --color-accent-2: #c9985a;
    --color-accent-contrast: #201c17;
    --color-divider: color-mix(in srgb, #efe9e0 14%, transparent);
    --shadow-sm: 0 0 0 1px color-mix(in srgb, #efe9e0 8%, transparent);
    --shadow-md: 0 4px 14px color-mix(in srgb, #000000 50%, transparent), 0 0 0 1px color-mix(in srgb, #efe9e0 8%, transparent);
    --shadow-lg: 0 16px 40px color-mix(in srgb, #000000 60%, transparent), 0 0 0 1px color-mix(in srgb, #efe9e0 10%, transparent);
  }
}
:root[data-theme="dark"] {
  --color-bg: #201c17;
  --color-surface: #2a251e;
  --color-text: #efe9e0;
  --color-accent: #d4a054;
  --color-accent-2: #c9985a;
  --color-accent-contrast: #201c17;
  --color-divider: color-mix(in srgb, #efe9e0 14%, transparent);
  --shadow-sm: 0 0 0 1px color-mix(in srgb, #efe9e0 8%, transparent);
  --shadow-md: 0 4px 14px color-mix(in srgb, #000000 50%, transparent), 0 0 0 1px color-mix(in srgb, #efe9e0 8%, transparent);
  --shadow-lg: 0 16px 40px color-mix(in srgb, #000000 60%, transparent), 0 0 0 1px color-mix(in srgb, #efe9e0 10%, transparent);
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  transition: background 0.15s ease, color 0.15s ease;
}
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: var(--font-heading-weight); }

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font-size: 15px; line-height: 1.55; font-weight: 400; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 var(--space-2);
}
h1 { font-size: 32px; }
h2 { font-size: 26px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }
h5 { font-size: 14px; }
h6 { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent-700); text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }
img { display: block; max-width: 100%; }
.text-muted { color: color-mix(in srgb, var(--color-text) 55%, transparent); }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 28%, transparent); }

.hr { height: 1px; border: 0; margin: var(--space-4) 0; background: var(--color-divider); }

/* — buttons: outlined, never filled — */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: var(--radius-md);
  transition: background 0.1s ease, border-color 0.1s ease, color 0.1s ease;
}
.btn svg { display: block; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { color: var(--color-accent-700); border-color: var(--color-accent); }
.btn-primary:hover { background: color-mix(in srgb, var(--color-accent) 12%, transparent); }
.btn-primary:active { background: color-mix(in srgb, var(--color-accent) 22%, transparent); }
.btn-secondary { border-color: var(--color-divider); background: var(--color-surface); }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, var(--color-surface)); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, var(--color-surface)); }
.btn-ghost { color: var(--color-accent-700); padding-inline: var(--space-1); }
.btn-ghost:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.btn-ghost:active { background: color-mix(in srgb, var(--color-accent) 18%, transparent); }
.btn-icon { width: 36px; height: 36px; padding: 0; border-color: var(--color-divider); }
.btn-icon:hover { background: color-mix(in srgb, var(--color-text) 6%, transparent); }
.btn-block { width: 100%; margin-top: var(--space-2); }

/* — forms — */
.field > label {
  display: block; font-family: var(--font-body); font-size: 12px; margin-bottom: 5px; font-weight: 500;
  color: color-mix(in srgb, var(--color-text) 65%, transparent);
}
.input {
  width: 100%; min-height: 38px; padding: 8px 11px; font: inherit;
  font-family: var(--font-body); font-size: 14px; color: var(--color-text); caret-color: var(--color-accent);
  background: var(--color-bg);
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
}
.input:hover { border-color: color-mix(in srgb, var(--color-text) 35%, var(--color-divider)); }
.input:focus-visible { border-color: var(--color-accent); outline-offset: 0; }
textarea.input { min-height: 84px; resize: vertical; }
select.input { cursor: pointer; }
#topicInput { min-height: 130px; }

/* — cards — */
.card {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-md);
  background: var(--color-bg); border: 1px solid var(--color-divider);
}
.card-kicker { font-family: var(--font-heading); font-size: 12px; font-weight: 600; letter-spacing: 0.03em; color: var(--color-accent-700); }
.card-title { font-family: var(--font-heading); font-weight: var(--font-heading-weight); font-size: 16px; line-height: 1.2; }
.card-body { margin: 0; font-family: var(--font-body); font-size: 14.5px; line-height: 1.62; flex: 1; white-space: pre-wrap; text-align: justify; hyphens: auto; }
.card-meta { display: flex; align-items: center; gap: 6px; font-size: 11px; color: color-mix(in srgb, var(--color-text) 50%, transparent); }
.elev-sm { box-shadow: var(--shadow-sm); }
.elev-md { box-shadow: var(--shadow-md); }
.elev-lg { box-shadow: var(--shadow-lg); }

/* — tags — */
.tag { display: inline-flex; align-items: center; font-family: var(--font-body); font-size: 11px; font-weight: 500; letter-spacing: 0.01em; padding: 3px 9px; border-radius: 999px; }
.tag-accent { background: var(--color-accent-100); color: var(--color-accent-800); }
.tag-accent-2 { background: var(--color-accent-2-100); color: var(--color-accent-2-800); }
.tag-neutral { background: var(--color-neutral-200); color: var(--color-neutral-800); }
.tag-outline { border: 1px solid var(--color-divider); color: var(--color-text); }

/* — navigation — */
.nav { display: flex; align-items: center; gap: var(--space-4); padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-divider); }
.nav-brand { font-family: var(--font-heading); font-weight: 600; font-size: 18px; margin-right: auto; letter-spacing: -0.01em; }
.nav a { color: inherit; text-decoration: none; font-size: 14px; }
.nav a:hover, .nav a[aria-current='page'] { color: var(--color-accent-700); }
.nav-user { font-family: var(--font-body); font-size: 13px; color: color-mix(in srgb, var(--color-text) 60%, transparent); }

/* — auth screen — */
.auth-screen { flex: 1; display: flex; align-items: center; justify-content: center; padding: var(--space-6); }
.auth-card { width: min(380px, 100%); padding: var(--space-6); gap: var(--space-3); }
.auth-card .card-title { text-align: center; font-size: 22px; }
.auth-tabs { display: flex; width: 100%; }
.auth-tabs .rounds-opt { flex: 1; }
.auth-card .btn-block { margin-top: var(--space-2); }
.field-hint { display: block; margin-top: 4px; font-family: var(--font-body); font-size: 11.5px; line-height: 1.4; color: color-mix(in srgb, var(--color-text) 55%, transparent); }
.auth-error {
  margin: 0; padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  font-family: var(--font-body); font-size: 12.5px; line-height: 1.45;
  color: var(--color-accent-800); background: var(--color-accent-100);
  border: 1px solid var(--color-accent-300);
}
.btn-icon.needs-attention { border-color: var(--color-accent); color: var(--color-accent-700); }

/* — settings dialog — */
.dialog-wide { width: min(520px, 100%); }
.settings-section { display: flex; flex-direction: column; gap: var(--space-2); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-divider); }
.settings-section:last-of-type { border-bottom: 0; padding-bottom: 0; }
.settings-section h4 { margin: 0; font-family: var(--font-heading); font-size: 15px; }
.settings-section .dialog-body { margin: 0; }
.settings-actions { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }

.invite-list { display: flex; flex-direction: column; gap: 4px; max-height: 240px; overflow-y: auto; margin-top: var(--space-1); }
.invite-row { display: flex; align-items: center; gap: var(--space-2); padding: 5px 8px; border: 1px solid var(--color-divider); border-radius: var(--radius-md); }
.invite-row.spent { opacity: 0.5; }
.invite-code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; letter-spacing: 0.04em; cursor: pointer; padding: 1px 4px; border-radius: var(--radius-sm); }
.invite-code:hover { background: color-mix(in srgb, var(--color-accent) 12%, transparent); }
.invite-code.copied { background: color-mix(in srgb, var(--color-accent) 28%, transparent); }
.invite-meta { flex: 1; min-width: 0; font-size: 11.5px; color: color-mix(in srgb, var(--color-text) 55%, transparent); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* — dialog — */
.dialog-backdrop { position: fixed; inset: 0; display: grid; place-items: center; padding: var(--space-4); background: color-mix(in srgb, var(--color-neutral-900) 45%, transparent); }
.dialog { width: min(420px, 100%); display: flex; flex-direction: column; gap: var(--space-3); padding: var(--space-4); border-radius: var(--radius-md); background: var(--color-bg); box-shadow: var(--shadow-lg); border: 1px solid var(--color-divider); }
.dialog-title { font-family: var(--font-heading); font-weight: var(--font-heading-weight); font-size: 18px; }
.dialog-body { font-family: var(--font-body); font-size: 13.5px; color: color-mix(in srgb, var(--color-text) 75%, transparent); }
.dialog-actions { display: flex; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-2); }

/* — app shell (AI-Debate specific: sidebar + conversation panel) — */
.app-shell { display: flex; flex: 1; min-height: 0; }
.sidebar {
  width: 280px; flex: none; overflow: hidden;
  display: flex; flex-direction: column; background: var(--color-bg); border-right: 1px solid var(--color-divider);
  transition: width 0.18s ease, border-color 0.18s ease;
}
.app-shell.sidebar-collapsed .sidebar { width: 0; border-right-color: transparent; }
.sidebar-backdrop { display: none; }
.sidebar-header { padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); border-bottom: 1px solid var(--color-divider); }
.conv-list { flex: 1; overflow-y: auto; padding: var(--space-2); }
.conv-item { display: block; width: 100%; text-align: left; cursor: pointer; padding: var(--space-2) var(--space-3); border: 1px solid transparent; border-radius: var(--radius-md); background: transparent; font-family: var(--font-body); color: var(--color-text); margin-bottom: 1px; position: relative; }
.conv-item:hover { background: color-mix(in srgb, var(--color-text) 5%, transparent); }
.conv-item.active { background: var(--color-bg); border-color: var(--color-accent-300); box-shadow: var(--shadow-sm); }
.conv-item.active::before { content: ""; position: absolute; left: 0; top: 10px; bottom: 10px; width: 2px; background: var(--color-accent); border-radius: 2px; }
.conv-title { font-family: var(--font-heading); font-weight: 600; font-size: 15px; display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.conv-title-text { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv-title input { font: inherit; font-family: var(--font-heading); font-weight: 600; background: var(--color-bg); color: inherit; border: 1px solid var(--color-accent); border-radius: var(--radius-sm); padding: 1px 4px; width: 100%; }
.conv-preview { font-family: var(--font-body); font-size: 11.5px; color: color-mix(in srgb, var(--color-text) 55%, transparent); margin-top: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-del { flex: none; opacity: 0.65; background: transparent; border: 0; cursor: pointer; color: color-mix(in srgb, var(--color-text) 75%, transparent); padding: 2px; border-radius: var(--radius-sm); }
.conv-item:hover .conv-del { opacity: 1; }
.conv-del:hover { color: var(--color-accent-700); background: color-mix(in srgb, var(--color-accent) 12%, transparent); opacity: 1; }
.conv-del svg { width: 14px; height: 14px; display: block; stroke: currentColor; fill: none; stroke-width: 1.7; }

.main-panel { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.panel-header { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-6); border-bottom: 1px solid var(--color-divider); }
.panel-title { font-family: var(--font-heading); font-weight: var(--font-heading-weight); font-size: 20px; margin-right: auto; letter-spacing: -.015em; }
.panel-title input { font: inherit; font-family: var(--font-heading); font-weight: var(--font-heading-weight); background: var(--color-bg); color: inherit; border: 1px solid var(--color-accent); border-radius: var(--radius-sm); padding: 1px 4px; }

.new-conv-form, .log, .composer { padding: var(--space-6); }
.new-conv-form { display: flex; flex-direction: column; gap: var(--space-4); max-width: 760px; }
.new-conv-form .row { display: flex; gap: var(--space-3); align-items: flex-end; }

.participant-models { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-2); }
.participant-card { flex: 1; min-width: 220px; display: flex; flex-direction: column; gap: 8px; padding: var(--space-3); border: 1px solid var(--color-divider); border-radius: var(--radius-md); background: var(--color-bg); }
.participant-card-head { display: flex; align-items: center; gap: 8px; }
.participant-avatar { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--color-accent); display: grid; place-items: center; font-family: var(--font-heading); font-weight: 600; font-size: 13px; color: var(--color-accent-700); }
.participant-name-input { flex: 1; min-width: 0; font: inherit; font-family: var(--font-heading); font-weight: 600; font-size: 15px; background: transparent; color: inherit; border: 0; padding: 2px 0; border-bottom: 1px solid transparent; }
.participant-name-input:hover, .participant-name-input:focus-visible { border-bottom-color: var(--color-divider); outline: none; }
.participant-remove { flex: none; background: none; border: 0; cursor: pointer; color: color-mix(in srgb, var(--color-text) 45%, transparent); padding: 3px; display: grid; place-items: center; border-radius: var(--radius-sm); }
.participant-remove:hover { color: var(--color-accent-700); background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.participant-card .custom-model { margin-top: -2px; }
.participant-card .participant-instructions { font-size: 13.5px; min-height: 96px; resize: vertical; }
.add-participant { align-self: flex-start; padding-inline: 0; }
.summary-picker { display: flex; flex-direction: column; gap: 8px; max-width: 340px; }

.switch-field { display: inline-flex; align-items: center; gap: 7px; cursor: pointer; font-family: var(--font-body); font-size: 13px; color: var(--color-text); }
.switch-field input { accent-color: var(--color-accent); width: 15px; height: 15px; cursor: pointer; margin: 0; }
#pauseToggleWrap { display: flex; align-items: center; }

.rounds-seg { display: inline-flex; border: 1px solid var(--color-divider); border-radius: var(--radius-md); overflow: hidden; width: fit-content; }
.rounds-seg .rounds-opt {
  font-family: var(--font-heading); font-weight: 600; font-size: 14px; font-variant-numeric: tabular-nums;
  background: var(--color-bg); color: var(--color-text); border: 0; border-right: 1px solid var(--color-divider);
  padding: 9px 16px; cursor: pointer;
}
.rounds-seg .rounds-opt:last-child { border-right: 0; }
.rounds-seg .rounds-opt:hover { background: color-mix(in srgb, var(--color-text) 6%, var(--color-bg)); }
.rounds-seg .rounds-opt.active { background: color-mix(in srgb, var(--color-accent) 14%, transparent); color: var(--color-accent-700); }

.log { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: var(--space-4); }
.msg-row { display: flex; }
.msg-row.gpt { justify-content: flex-end; }
.msg-row .card { max-width: min(78%, 760px); }
.msg-row.claude .card { border-left: 3px solid var(--color-accent); }
.msg-row.claude .card-kicker { color: var(--color-accent-700); }
.msg-row.gpt .card { border-right: 3px solid var(--color-neutral-700); }
.msg-row.gpt .card-kicker { color: var(--color-neutral-800); }
.msg-row.user { justify-content: center; }
.msg-row.user .card { max-width: min(88%, 840px); background: transparent; border-style: dashed; }
.msg-row.user .card-kicker { color: color-mix(in srgb, var(--color-text) 55%, transparent); }
/* Summary is a verdict on the whole debate, not another voice in it — so it
   spans the full width instead of picking a side of the log. */
.msg-row.summary { justify-content: center; }
.msg-row.summary .card {
  max-width: min(92%, 920px); width: 100%;
  border: 1px solid var(--color-accent); border-left: 3px solid var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 5%, var(--color-bg));
}
.msg-row.summary .card-kicker { color: var(--color-accent-700); text-transform: uppercase; letter-spacing: 0.06em; }

/* Which model is behind a custom name — muted, so it never competes with the
   name itself, but always present. */
.model-badge {
  margin-left: 8px; padding: 1px 6px; border-radius: 999px;
  font-family: var(--font-body); font-size: 10.5px; font-weight: 500; letter-spacing: 0;
  text-transform: none; white-space: nowrap;
  color: color-mix(in srgb, var(--color-text) 58%, transparent);
  background: color-mix(in srgb, var(--color-text) 7%, transparent);
}

.participants-legend {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-4);
  padding: var(--space-2) var(--space-6); border-bottom: 1px solid var(--color-divider);
}
.participants-legend:empty { display: none; }
.legend-item { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; }
.legend-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.legend-name { font-family: var(--font-heading); font-weight: 600; }
.legend-model { color: color-mix(in srgb, var(--color-text) 55%, transparent); font-size: 11px; }

.msg-row.system { justify-content: center; }
.system-msg { display: flex; flex-direction: column; align-items: center; gap: 6px; max-width: 560px; text-align: center; }
.system-msg .actions { display: flex; gap: var(--space-2); }
.typing-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: currentColor; opacity: 0.55; animation: typing-pulse 1.1s ease-in-out infinite; margin-left: 4px; }
@keyframes typing-pulse { 0%, 100% { opacity: 0.25; } 50% { opacity: 0.85; } }

.attachment-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.attachment-chip { display: inline-flex; align-items: center; gap: 5px; font-family: var(--font-body); font-size: 11.5px; padding: 3px 9px; border-radius: 999px; background: var(--color-neutral-200); color: var(--color-neutral-800); max-width: 220px; }
.attachment-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attachment-chip button { flex: none; background: none; border: 0; cursor: pointer; color: inherit; opacity: 0.6; padding: 0; line-height: 1; font-size: 13px; }
.attachment-chip button:hover { opacity: 1; }

.composer { display: flex; flex-direction: column; gap: var(--space-2); border-top: 1px solid var(--color-divider); }
.composer-row { display: flex; gap: var(--space-2); align-items: flex-end; }
.composer-row .input { flex: 1; }

.empty-state { flex: 1; display: flex; align-items: center; justify-content: center; }

.status-actions { display: flex; align-items: center; gap: var(--space-2); }

/* — phones — */
@media (max-width: 720px) {
  /* Sticky + a z-index above the drawer (41) and its backdrop (40), so the
     header — and the toggle button that closes the drawer — always stays
     reachable instead of being covered by the fixed-position sidebar. */
  .nav { position: sticky; top: 0; z-index: 50; background: var(--color-bg); padding: var(--space-2) var(--space-3); gap: var(--space-2); }
  .nav-brand { font-size: 16px; }
  .nav-user { display: none !important; } /* email doesn't fit next to four icon buttons on a phone-width header */

  /* The sidebar becomes an off-canvas drawer instead of a permanent column —
     there isn't room for list + conversation side by side. `.sidebar-collapsed`
     keeps meaning "hidden", just via a slide-out transform instead of width:0
     (which would leave the drawer's own width squeezing the layout while
     mid-transition). */
  .app-shell { position: relative; overflow: hidden; }
  .sidebar {
    position: fixed; top: 0; bottom: 0; left: 0; z-index: 41;
    width: min(86vw, 320px);
    box-shadow: var(--shadow-lg);
    transform: translateX(0);
    transition: transform 0.2s ease;
  }
  .app-shell.sidebar-collapsed .sidebar { width: min(86vw, 320px); transform: translateX(-100%); }
  .app-shell:not(.sidebar-collapsed) .sidebar-backdrop {
    display: block; position: fixed; inset: 0; z-index: 40;
    background: color-mix(in srgb, var(--color-neutral-900) 45%, transparent);
  }

  .panel-header { padding: var(--space-2) var(--space-3); flex-wrap: wrap; }
  .panel-title { font-size: 17px; }

  .new-conv-form, .log, .composer { padding: var(--space-3); }
  .new-conv-form { gap: var(--space-3); }
  .participant-card { min-width: 100%; }
  .rounds-seg { width: 100%; }
  .rounds-seg .rounds-opt { flex: 1; padding: 9px 6px; font-size: 12.5px; }

  .msg-row .card, .msg-row.user .card, .msg-row.summary .card { max-width: 94%; }
  .card { padding: var(--space-2) var(--space-3); }
  .card-body { text-align: left; } /* justify produces ugly rivers of whitespace on a narrow column */

  .composer-row { gap: 6px; }
  .participants-legend { padding: var(--space-2) var(--space-3); }

  .auth-screen { padding: var(--space-3); }
  .auth-card { padding: var(--space-4); }
  .dialog-backdrop { padding: var(--space-3); }
}