/* ═══════════════════════════════════════════════════════════════════
   SevinHub Code — Chat interface
   Design system copies live SevinHub v7 (May 2026): navy base +
   purple/blue/cyan accents. Hub Network Mesh backdrop is the same
   engine used across sevinhub.com. Inter typography, JetBrains code.
   ═══════════════════════════════════════════════════════════════════ */

:root {
  color-scheme: dark;

  --bg-0:        #08080f;
  --bg-1:        #0c0c17;
  --bg-2:        #10101d;
  --bg-3:        #171727;
  --panel:       rgba(17,17,32,0.72);
  --panel-solid: #111120;
  --panel-hi:    #161628;
  --line:        rgba(255,255,255,0.06);
  --line-mid:    rgba(255,255,255,0.09);
  --line-hi:     rgba(255,255,255,0.14);

  --ink:         #ecedf5;
  --ink-2:       #c9cbd8;
  --ink-3:       #9295aa;
  --ink-4:       #55557a;

  --purple:      #7c3aed;
  --purple-l:    #a78bfa;
  --purple-h:    #6d28d9;
  --blue:        #3b82f6;
  --blue-l:      #60a5fa;
  --cyan:        #06b6d4;
  --cyan-l:      #22d3ee;
  --ok:          #10b981;
  --warn:        #f59e0b;
  --err:         #ef4444;
  --err-bg:      rgba(239,68,68,0.08);

  --grad:        linear-gradient(135deg, #7c3aed 0%, #3b82f6 55%, #06b6d4 100%);
  --grad-soft:   linear-gradient(135deg, rgba(124,58,237,0.16), rgba(6,182,212,0.10));
  --grad-text:   linear-gradient(90deg, #a78bfa 0%, #60a5fa 35%, #22d3ee 70%, #a78bfa 100%);

  --font:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono:        'JetBrains Mono', 'SF Mono', Consolas, monospace;

  --r-sm: 8px; --r: 12px; --r-lg: 18px; --r-xl: 22px;
  --sidebar-w: 268px;
  --shadow:    0 30px 60px -30px rgba(0,0,0,0.75), 0 0 0 1px var(--line);
  --shadow-glow: 0 0 32px rgba(124,58,237,0.28);
  --tx: .2s cubic-bezier(.4,0,.2,1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
html { background: var(--bg-0); }        /* solid base so canvas has something to blend onto */
body {
  background: transparent;                /* transparent → canvas shows through everywhere */
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  min-height: 100dvh;
}

/* Beam mesh sits behind normal flow, higher opacity for visibility inside chat */
#nBeamCanvas {
  position: fixed !important;
  inset: 0 !important;
  z-index: -1 !important;
  opacity: .38 !important;
  pointer-events: none;
}

/* ── Global scrollbar ─── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.05); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(124,58,237,0.35); }

/* ═════ Brand primitives ═════════════════════════════════════════ */
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--grad); color: #fff;
  font-weight: 700; font-size: 13px; letter-spacing: 0.5px;
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}
.brand-mark.big { width: 56px; height: 56px; border-radius: 16px; font-size: 20px; }
.brand-text { font-weight: 600; font-size: 15px; }
.brand-accent {
  background: var(--grad-text); background-size: 200% auto;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 6s linear infinite;
}
@keyframes shimmer { to { background-position: 200% 50%; } }

/* ═════ App shell — 2-column grid ══════════════════════════════════ */
.app-shell {
  position: relative;                         /* stacks NORMALLY over canvas at z:-1 */
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100dvh;
  overflow: hidden;
  background: transparent;                    /* let mesh show through */
}
.app-shell.side-collapsed { grid-template-columns: 0 1fr; }
.app-shell.side-collapsed .sidebar { transform: translateX(-100%); }

/* ═════ Sidebar ══════════════════════════════════════════════════ */
.sidebar {
  background: #0b0b16;                 /* solid — no bleed-through */
  border-right: 1px solid var(--line-mid);
  display: flex; flex-direction: column;
  padding: 14px 12px 14px 14px;
  transition: transform var(--tx);
  z-index: 20;
}
.side-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; padding: 4px;
}
.icon-btn {
  width: 34px; height: 34px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; color: var(--ink-3);
  border: 1px solid transparent; cursor: pointer;
  transition: all var(--tx);
}
.icon-btn:hover { background: rgba(255,255,255,0.05); color: var(--ink); border-color: var(--line-mid); }

.btn-new {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 14px; border-radius: 10px;
  background: var(--grad-soft);
  border: 1px solid rgba(124,58,237,0.28);
  color: var(--ink); font-family: inherit; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: all var(--tx);
  margin-bottom: 12px;
}
.btn-new:hover { border-color: rgba(124,58,237,0.55); box-shadow: 0 0 20px rgba(124,58,237,0.22); }

.convo-list {
  flex: 1; overflow-y: auto;
  display: flex; flex-direction: column; gap: 2px;
  padding: 2px 0;
  margin-right: -6px; padding-right: 6px;
}
.convo-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px;
  color: var(--ink-2); font-size: 13.5px;
  cursor: pointer; transition: background var(--tx);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.convo-item:hover { background: rgba(255,255,255,0.03); }
.convo-item.active { background: rgba(124,58,237,0.12); color: var(--ink); }
.convo-title {
  flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis;
}
.convo-del {
  opacity: 0; width: 24px; height: 24px; border-radius: 6px;
  background: transparent; color: var(--ink-3); border: none;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all var(--tx); flex-shrink: 0;
}
.convo-item:hover .convo-del { opacity: 1; }
.convo-del:hover { background: rgba(239,68,68,0.15); color: var(--err); }
.convo-empty { padding: 20px 12px; color: var(--ink-4); font-size: 13px; text-align: center; }

.side-foot {
  border-top: 1px solid var(--line);
  padding-top: 10px; margin-top: 6px;
  display: flex; flex-direction: column; gap: 2px;
}
.side-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 8px;
  background: transparent; border: none;
  color: var(--ink-2); font: inherit; font-size: 13.5px;
  cursor: pointer; text-decoration: none;
  transition: background var(--tx);
}
.side-item:hover { background: rgba(255,255,255,0.04); color: var(--ink); }

/* ═════ Main area ═════════════════════════════════════════════════ */
.main {
  display: flex; flex-direction: column;
  min-width: 0; height: 100dvh;
  position: relative;
}
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line-mid);
  background: rgba(8,8,15,0.95);
  backdrop-filter: blur(20px);
  position: sticky; top: 0; z-index: 10;
}
.topbar-menu { display: none; }
.topbar-spacer { flex: 1; }

.model-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px 7px 12px; border-radius: 999px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line-mid);
  color: var(--ink); font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all var(--tx);
}
.model-badge:hover { border-color: rgba(124,58,237,0.4); background: rgba(124,58,237,0.05); }
.model-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 8px var(--ok);
}
.model-badge .dot.byok { background: var(--purple-l); box-shadow: 0 0 8px var(--purple); }
.model-badge .dot.warn { background: var(--warn); box-shadow: 0 0 8px var(--warn); }
.model-provider { color: var(--ink); font-weight: 600; }
.model-name { font-family: var(--mono); font-size: 12px; color: var(--ink-2); }
.model-sep { color: var(--ink-4); }
.model-badge .chev { color: var(--ink-3); margin-left: 2px; }

/* ═════ Chat surface ═════════════════════════════════════════════ */
.chat {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0 20px;
  scroll-behavior: smooth;
}
.chat > .msg,
.chat > .welcome {
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 24px;
}

.welcome {
  padding-top: 60px;
  padding-bottom: 40px;
  text-align: center;
}
.welcome-mark { margin-bottom: 24px; display: flex; justify-content: center; }
.welcome h1 { margin: 0 0 8px; font-size: 32px; font-weight: 700; letter-spacing: -0.5px; }
.welcome-sub { margin: 0 0 40px; color: var(--ink-3); font-size: 15px; }
.quick-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px;
  max-width: 640px; margin: 0 auto;
}
.q-card {
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px; text-align: left;
  background: rgba(17,17,32,0.55);
  border: 1px solid var(--line-mid);
  border-radius: var(--r);
  color: var(--ink); font: inherit; cursor: pointer;
  transition: all var(--tx);
}
.q-card:hover {
  border-color: rgba(124,58,237,0.4);
  background: rgba(124,58,237,0.06);
  transform: translateY(-1px);
}
.q-cat {
  font-size: 10.5px; font-weight: 600; letter-spacing: 1.2px;
  text-transform: uppercase; color: var(--purple-l);
}
.q-title { font-size: 14px; font-weight: 600; color: var(--ink); }
.q-desc { font-size: 12.5px; color: var(--ink-3); }

/* ═════ Messages ═════════════════════════════════════════════════ */
.msg {
  padding: 24px 0;
  border-top: 1px solid transparent;
  animation: fadeIn .3s ease;
}
.msg + .msg { border-top-color: var(--line); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.msg-head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px;
  font-size: 12.5px; color: var(--ink-3); font-weight: 500;
}
.role-tag {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--ink); font-weight: 600;
}
.role-tag::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ink-3);
}
.msg.user .role-tag::before { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
.msg.assistant .role-tag::before { background: var(--purple-l); box-shadow: 0 0 6px var(--purple); }

.thinking-block {
  margin: 8px 0 12px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.02);
  border-left: 2px solid var(--purple);
  border-radius: 0 8px 8px 0;
  font-size: 13px;
  color: var(--ink-3);
  font-style: italic;
  transition: max-height var(--tx);
}
.thinking-block summary {
  cursor: pointer; list-style: none;
  color: var(--purple-l); font-weight: 500; font-style: normal;
  display: flex; align-items: center; gap: 8px;
  padding: 4px 0;
}
.thinking-block summary::before {
  content: "▸"; transition: transform var(--tx);
}
.thinking-block[open] summary::before { transform: rotate(90deg); }
.thinking-block .think-body {
  margin-top: 8px; padding-top: 8px;
  border-top: 1px dashed var(--line);
  white-space: pre-wrap; line-height: 1.55;
}

.bubble {
  color: var(--ink);
  line-height: 1.65;
  overflow-wrap: break-word;
}
.bubble p { margin: 0 0 12px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble h1, .bubble h2, .bubble h3 { margin: 20px 0 10px; font-weight: 600; }
.bubble h1 { font-size: 22px; }
.bubble h2 { font-size: 18px; color: var(--purple-l); }
.bubble h3 { font-size: 15px; color: var(--purple-l); }
.bubble a { color: var(--cyan-l); text-decoration: none; border-bottom: 1px solid rgba(34,211,238,0.4); }
.bubble a:hover { color: #fff; border-bottom-color: #fff; }

.bubble code {
  font-family: var(--mono); font-size: 13px;
  background: rgba(255,255,255,0.06); padding: 1px 6px; border-radius: 4px;
  color: #ffdca8;
}
.bubble pre {
  position: relative;
  margin: 14px 0;
  background: #05060b;
  border: 1px solid var(--line-mid);
  border-radius: var(--r-sm);
  overflow: hidden;
}
.bubble pre code {
  display: block;
  padding: 14px 16px;
  overflow-x: auto;
  background: transparent;
  color: #e6e6f2;
  font-size: 13px;
  line-height: 1.55;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line-mid);
  color: var(--ink-3);
  font-size: 10px; letter-spacing: 1.2px; text-transform: uppercase;
  padding: 4px 10px; border-radius: 6px;
  cursor: pointer; transition: all var(--tx);
}
.copy-btn:hover { background: rgba(124,58,237,0.15); color: var(--ink); }

.bubble ul, .bubble ol { padding-left: 22px; margin: 8px 0; }
.bubble li { margin: 4px 0; }
.bubble blockquote {
  margin: 12px 0; padding: 4px 16px;
  border-left: 2px solid var(--purple); color: var(--ink-2);
  background: rgba(124,58,237,0.04);
}
.bubble table { border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.bubble th, .bubble td { border: 1px solid var(--line-mid); padding: 6px 10px; text-align: left; }
.bubble th { background: rgba(255,255,255,0.04); color: var(--purple-l); font-weight: 600; }
.bubble hr { border: none; border-top: 1px solid var(--line); margin: 20px 0; }

.msg.error .bubble { color: var(--err); }
.msg.pending .bubble::after {
  content: "▍"; color: var(--purple-l);
  animation: cursor 1s infinite;
  margin-left: 2px;
}
@keyframes cursor { 50% { opacity: 0.2; } }

/* ═════ Composer ═════════════════════════════════════════════════ */
.composer {
  padding: 0 24px 20px;
  max-width: 780px;
  margin: 0 auto;
  width: 100%;
}
.composer-inner {
  display: flex; align-items: flex-end; gap: 8px;
  padding: 8px 8px 8px 18px;
  background: #10101d;
  border: 1px solid var(--line-hi);
  border-radius: var(--r-xl);
  box-shadow: 0 20px 40px -20px rgba(0,0,0,0.6);
  transition: border-color var(--tx);
}
.composer-inner:focus-within {
  border-color: rgba(124,58,237,0.5);
  box-shadow: 0 0 24px rgba(124,58,237,0.15), 0 20px 40px -20px rgba(0,0,0,0.6);
}
.composer textarea {
  flex: 1;
  resize: none; min-height: 26px; max-height: 260px;
  padding: 10px 6px;
  background: transparent; color: var(--ink);
  font-family: inherit; font-size: 15px; line-height: 1.5;
  border: none; outline: none;
}
.composer textarea::placeholder { color: var(--ink-4); }
.tool-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: 10px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line-mid);
  color: var(--ink-3);
  font: inherit; font-size: 12px; font-weight: 500;
  cursor: pointer; transition: all var(--tx);
  flex-shrink: 0; margin-bottom: 2px;
  align-self: flex-end;
}
.tool-btn:hover { color: var(--ink); border-color: var(--line-hi); }
.tool-btn[aria-pressed="true"] {
  background: rgba(124,58,237,0.15);
  color: var(--purple-l);
  border-color: rgba(124,58,237,0.4);
  box-shadow: 0 0 12px rgba(124,58,237,0.2);
}
.tool-btn span { display: inline; }
@media (max-width: 500px) { .tool-btn span { display: none; } .tool-btn { padding: 8px; } }

.send-btn {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--grad);
  border: none;
  color: #fff; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px -2px rgba(124,58,237,0.6);
  transition: all var(--tx);
  flex-shrink: 0;
}

/* Small "memory saved" note that pops between messages */
.auto-note {
  max-width: 780px;
  margin: 0 auto;
  padding: 8px 20px;
  color: var(--ok);
  font-size: 12.5px;
  font-weight: 500;
  text-align: center;
  animation: fadeIn .3s ease;
}

/* Tool card — search/fetch result summary shown above assistant reply */
.tool-card {
  margin: 8px 0 12px;
  border: 1px solid var(--line-mid); border-radius: 10px;
  background: rgba(6,182,212,0.05);
  padding: 10px 14px;
  font-size: 13px;
}
.tool-card-head {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--cyan-l); font-weight: 600; font-size: 12px;
  letter-spacing: 0.5px; text-transform: uppercase;
  margin-bottom: 6px;
}
.tool-card ol { padding-left: 20px; margin: 4px 0; color: var(--ink-2); }
.tool-card li { margin: 4px 0; }
.tool-card li a { color: var(--cyan-l); font-weight: 500; }
.tool-card li small { display: block; color: var(--ink-4); font-size: 11.5px; margin-top: 2px; }
.send-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px -2px rgba(124,58,237,0.75); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.composer-foot {
  margin: 10px 4px 0;
  font-size: 11.5px; color: var(--ink-4); text-align: center;
  display: flex; justify-content: center; gap: 8px; flex-wrap: wrap;
}
.composer-foot .dim { color: var(--ink-4); }

/* ═════ Settings drawer ═════════════════════════════════════════ */
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(420px, 100vw);
  background: #0d0d18;
  border-left: 1px solid var(--line-hi);
  box-shadow: -30px 0 60px rgba(0,0,0,0.5);
  z-index: 100;
  transform: translateX(100%);
  transition: transform var(--tx);
  overflow-y: auto;
}
.drawer[aria-hidden="false"] { transform: none; }
.drawer-inner { padding: 20px 24px 40px; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.drawer-head h2 { margin: 0; font-size: 20px; font-weight: 600; }

.tabs {
  display: flex; gap: 4px;
  padding: 4px; margin-bottom: 20px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line-mid);
  border-radius: 10px;
}
.tab {
  flex: 1; padding: 8px 12px; border-radius: 7px;
  background: transparent; border: none;
  color: var(--ink-3); font: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all var(--tx);
}
.tab:hover { color: var(--ink); }
.tab.active { background: rgba(124,58,237,0.18); color: var(--ink); border: 1px solid rgba(124,58,237,0.3); }

.tab-panel { animation: fadeIn .2s ease; }

.setting {
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.setting:last-child { border-bottom: none; }
.setting label,
.setting > .tg-head {
  display: block; margin-bottom: 6px;
  font-size: 12.5px; font-weight: 500;
  color: var(--ink-2); letter-spacing: 0.3px;
}
.tg-head { color: var(--purple-l); font-size: 14px; font-weight: 600; margin: 0 0 6px; }
.setting label .dim,
.setting .pill { color: var(--ink-4); font-weight: 400; font-size: 12px; }
.setting .pill {
  display: inline-block;
  padding: 1px 8px; border-radius: 999px;
  background: rgba(124,58,237,0.12); color: var(--purple-l);
  font-family: var(--mono); font-size: 11px;
}
.setting input[type="text"],
.setting input[type="password"],
.setting input[type="number"],
.setting select {
  width: 100%; padding: 10px 12px;
  background: var(--bg-0); color: var(--ink);
  border: 1px solid var(--line-mid); border-radius: 8px;
  font-family: inherit; font-size: 14px; outline: none;
  transition: border-color var(--tx);
}
.setting input:focus, .setting select:focus { border-color: var(--purple); }
.setting select { appearance: none; -webkit-appearance: none; cursor: pointer; padding-right: 32px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%239295aa' stroke-width='2' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
}
.setting input[type="range"] { width: 100%; accent-color: var(--purple); padding: 0; }
.setting .hint { margin: 6px 0 0; font-size: 12.5px; color: var(--ink-4); line-height: 1.5; }
.setting .hint code {
  background: rgba(124,58,237,0.10); color: var(--purple-l);
  padding: 1px 6px; border-radius: 4px; font-family: var(--mono); font-size: 11.5px;
}
.setting .hint a { color: var(--cyan-l); text-decoration: none; border-bottom: 1px dotted rgba(34,211,238,0.4); }
.setting .hint a:hover { color: #fff; }

.switch { display: inline-flex; align-items: center; gap: 12px; cursor: pointer; margin-bottom: 0 !important; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch .slider {
  position: relative; width: 40px; height: 22px;
  background: rgba(255,255,255,0.10); border-radius: 999px;
  transition: background var(--tx);
}
.switch .slider::after {
  content: ""; position: absolute; top: 3px; left: 3px;
  width: 16px; height: 16px; border-radius: 50%; background: #fff;
  transition: transform var(--tx);
}
.switch input:checked + .slider { background: var(--purple); }
.switch input:checked + .slider::after { transform: translateX(18px); }
.switch-label { color: var(--ink); font-size: 13.5px; font-weight: 500; letter-spacing: 0; }

.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 10px;
  font-family: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all var(--tx); border: 1px solid transparent;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 4px 14px -2px rgba(124,58,237,0.5); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: rgba(255,255,255,0.03); border-color: var(--line-mid); color: var(--ink-2); }
.btn-ghost:hover { border-color: var(--line-hi); color: var(--ink); }
.btn-ghost.small, .btn-primary.small { padding: 7px 12px; font-size: 12.5px; }

.server-status {
  padding: 10px 12px; border-radius: 8px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line-mid);
}
.server-status .hint { margin: 0; font-size: 12.5px; }
.tg-status { min-height: 16px; }
.tg-status.ok  { color: var(--ok); }
.tg-status.err { color: var(--err); }

/* ═════ Mobile overlay ═════════════════════════════════════════ */
.side-overlay {
  position: fixed; inset: 0; z-index: 15;
  background: rgba(5,6,11,0.6); backdrop-filter: blur(4px);
  opacity: 0; pointer-events: none;
  transition: opacity var(--tx);
}
.side-overlay[aria-hidden="false"] { opacity: 1; pointer-events: auto; }

/* ═════ Responsive ═════════════════════════════════════════════ */
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: 280px; transform: translateX(-100%);
  }
  .app-shell.side-open .sidebar { transform: none; }
  .topbar-menu { display: inline-flex; }
  .quick-grid { grid-template-columns: 1fr; }
  .chat > .msg, .chat > .welcome, .composer { padding-left: 16px; padding-right: 16px; }
  .welcome h1 { font-size: 26px; }
  .composer { padding-bottom: max(16px, env(safe-area-inset-bottom)); }
  .drawer { width: 100vw; }
  .model-badge { font-size: 12px; padding: 6px 12px 6px 10px; }
  .model-badge .model-sep, .model-badge .model-name { display: none; }
}
@media (max-width: 500px) {
  .welcome { padding-top: 40px; }
  .welcome-mark { display: none; }
  .welcome h1 { font-size: 22px; }
  .welcome-sub { font-size: 13.5px; margin-bottom: 26px; }
  .q-card { padding: 12px; }
}