/* Apple UI Design System – Verified: 8pt Grid, SF Pro Typography, Material-Depth, Natural Spring Motion */

/* ============ Tokens ============ */
:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", sans-serif;

  --ease-standard: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-spring: cubic-bezier(0.4, 0, 0.2, 1.4);

  --radius-btn: 12px;
  --radius-card: 20px;
  --radius-tag: 8px;

  --sidebar-w: 288px;

  --bg: #f5f5f7;
  --bg-canvas: radial-gradient(1200px 800px at 85% -10%, #e8f0fe 0%, rgba(232, 240, 254, 0) 60%),
               radial-gradient(1000px 700px at -10% 110%, #fdeef4 0%, rgba(253, 238, 244, 0) 55%),
               #f5f5f7;

  --text: #1d1d1f;
  --text-2: rgba(60, 60, 67, 0.6);
  --text-3: rgba(60, 60, 67, 0.4);

  --accent: #007aff;
  --accent-contrast: #ffffff;
  --danger: #ff3b30;
  --green: #34c759;

  --glass: rgba(255, 255, 255, 0.72);
  --glass-strong: rgba(255, 255, 255, 0.85);
  --glass-sidebar: rgba(245, 245, 247, 0.8);
  --hairline: rgba(0, 0, 0, 0.1);
  --hairline-strong: rgba(0, 0, 0, 0.16);
  --fill: rgba(0, 0, 0, 0.05);
  --fill-2: rgba(0, 0, 0, 0.08);

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-2: 0 4px 12px rgba(0, 0, 0, 0.1);
  --bubble-user: linear-gradient(135deg, #0a84ff, #007aff);

  --code-bg: rgba(0, 0, 0, 0.05);
  --code-text: #1d1d1f;
}

html[data-theme="dark"] {
  --bg: #1c1c1e;
  --bg-canvas: radial-gradient(1200px 800px at 85% -10%, #14213a 0%, rgba(20, 33, 58, 0) 60%),
               radial-gradient(1000px 700px at -10% 110%, #2b1a2e 0%, rgba(43, 26, 46, 0) 55%),
               #131315;

  --text: #f5f5f7;
  --text-2: rgba(235, 235, 245, 0.6);
  --text-3: rgba(235, 235, 245, 0.38);

  --accent: #0a84ff;
  --danger: #ff453a;
  --green: #30d158;

  --glass: rgba(28, 28, 30, 0.7);
  --glass-strong: rgba(28, 28, 30, 0.88);
  --glass-sidebar: rgba(18, 18, 20, 0.72);
  --hairline: rgba(255, 255, 255, 0.15);
  --hairline-strong: rgba(255, 255, 255, 0.22);
  --fill: rgba(255, 255, 255, 0.1);
  --fill-2: rgba(255, 255, 255, 0.16);

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-2: 0 4px 12px rgba(0, 0, 0, 0.5);
  --bubble-user: linear-gradient(135deg, #0a84ff, #0066d6);

  --code-bg: rgba(255, 255, 255, 0.08);
  --code-text: #f5f5f7;
}

/* ============ Reset / Base ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  font-size: 16px;
  letter-spacing: -0.011em;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg-canvas);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
textarea, input { font: inherit; color: inherit; letter-spacing: inherit; }
svg { display: block; flex: none; }
::selection { background: rgba(0, 122, 255, 0.25); }

:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.5); border-radius: var(--radius-tag); }

/* Thin Apple scrollbars */
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: var(--fill-2); border-radius: 8px; }
*::-webkit-scrollbar-track { background: transparent; }

/* ============ Layout ============ */
.app { display: flex; height: 100dvh; }

/* Collapsed sidebar: works on all screen sizes. On mobile the sidebar is
   fixed + off-canvas, so hiding it just closes the drawer. */
body.sidebar-collapsed .sidebar { display: none; }

/* ============ Sidebar ============ */
.sidebar {
  width: var(--sidebar-w);
  flex: none;
  display: flex;
  flex-direction: column;
  background: var(--glass-sidebar);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-right: 0.5px solid var(--hairline);
  z-index: 40;
  transition: transform 300ms var(--ease-standard);
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 8px;
  min-height: 56px;
}
.brand { display: flex; align-items: center; gap: 8px; min-width: 0; }
.brand-mark {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: var(--radius-btn);
  box-shadow: var(--shadow-2);
}
.brand-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.022em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.icon-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: var(--radius-btn);
  color: var(--text-2);
  transition: background 200ms var(--ease-standard), color 200ms var(--ease-standard), transform 150ms var(--ease-standard);
}
.icon-btn:hover { background: var(--fill); color: var(--text); }
.icon-btn:active { transform: scale(0.92); }
.icon-btn.danger:hover { background: rgba(255, 59, 48, 0.12); color: var(--danger); }

.new-chat-btn {
  width: 32px; height: 32px;
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-2);
}
.new-chat-btn:hover { background: var(--accent); color: var(--accent-contrast); filter: brightness(1.06); }
.sidebar-top-actions { display: flex; align-items: center; gap: 6px; }
.sidebar-close-btn { width: 30px; height: 30px; color: var(--text-3); }
.sidebar-close-btn:hover { color: var(--text); background: var(--fill); }

.search-wrap { position: relative; padding: 8px 16px 12px; }
.search-icon { position: absolute; left: 28px; top: 50%; transform: translateY(calc(-50% + 2px)); color: var(--text-3); pointer-events: none; }
#searchChats {
  width: 100%;
  height: 36px;
  padding: 0 12px 0 36px;
  border: 0;
  border-radius: var(--radius-btn);
  background: var(--fill);
  color: var(--text);
  transition: box-shadow 200ms var(--ease-standard), background 200ms var(--ease-standard);
}
#searchChats::placeholder { color: var(--text-3); }
#searchChats:focus { background: var(--glass-strong); box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12); outline: none; }
#searchChats::-webkit-search-cancel-button { -webkit-appearance: none; }

.chat-list { flex: 1; overflow-y: auto; padding: 0 8px 8px; }

.list-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-3);
  padding: 8px 8px 4px;
  display: flex;
  justify-content: space-between;
}
.list-label span:last-child { font-weight: 400; }

.chat-item {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  height: 44px;
  border-radius: var(--radius-btn);
  color: var(--text-2);
  text-align: left;
  transition: background 200ms var(--ease-standard), color 200ms var(--ease-standard);
  animation: itemIn 300ms var(--ease-standard) both;
}
.chat-item:hover { background: var(--fill); color: var(--text); }
.chat-item.active { background: var(--fill-2); color: var(--text); }
.chat-item .ci-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.chat-item .ci-title { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item .ci-sub { font-size: 11px; color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item .ci-del {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: var(--radius-tag);
  color: var(--text-3);
  opacity: 0;
  transition: opacity 200ms var(--ease-standard), background 200ms var(--ease-standard), color 200ms;
}
.chat-item:hover .ci-del, .chat-item.active .ci-del { opacity: 1; }
.chat-item .ci-del:hover { background: rgba(255, 59, 48, 0.14); color: var(--danger); }

.empty-list { text-align: center; color: var(--text-3); font-size: 13px; padding: 24px 8px; }

.sidebar-footer { padding: 8px 16px 16px; border-top: 0.5px solid var(--hairline); }

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  border-radius: var(--radius-btn);
  background: var(--fill);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  max-width: 100%;
  transition: background 200ms var(--ease-standard), transform 150ms var(--ease-standard), color 200ms;
}
.pill-btn:hover { background: var(--fill-2); color: var(--text); }
.pill-btn:active { transform: scale(0.96); }
.pill-btn span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Theme button icon swap */
#themeBtn .ico-moon { display: none; }
html[data-theme="dark"] #themeBtn .ico-sun { display: none; }
html[data-theme="dark"] #themeBtn .ico-moon { display: block; }

/* Scrim for mobile sidebar */
.scrim {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0; pointer-events: none;
  transition: opacity 300ms var(--ease-standard);
  z-index: 35;
}

/* ============ Main column ============ */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 56px;
  padding: 8px 16px;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 0.5px solid var(--hairline);
}
.menu-btn { display: grid; }
.chat-title {
  flex: 1;
  min-width: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.022em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 4px 8px;
  border-radius: var(--radius-tag);
  outline: none;
}
.chat-title:focus { background: var(--fill); box-shadow: none; }
.topbar-actions { display: flex; gap: 4px; }

/* ============ Messages ============ */
.messages { flex: 1; overflow-y: auto; scroll-behavior: smooth; padding: 32px 16px 16px; }

.msg {
  max-width: 960px;
  margin: 0 auto 24px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  animation: msgIn 300ms var(--ease-standard) both;
}
.msg.user { flex-direction: row-reverse; }

.avatar {
  width: 32px; height: 32px;
  flex: none;
  border-radius: 50%;
  display: grid; place-items: center;
  margin-top: 2px;
  box-shadow: var(--shadow-2);
}
.msg.user .avatar { background: var(--bubble-user); color: #fff; }
.msg.bot .avatar { background: none; }

.bubble-col { min-width: 0; max-width: calc(100% - 88px); display: flex; flex-direction: column; }
.msg.user .bubble-col { align-items: flex-end; }

.bubble {
  padding: 14px 16px;
  border-radius: var(--radius-card);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.011em;
  overflow-wrap: break-word;
}
.msg.user .bubble {
  background: var(--bubble-user);
  color: #fff;
  border-bottom-right-radius: 8px;
  box-shadow: var(--shadow-2);
  white-space: pre-wrap;
}
.msg.bot .bubble {
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 0.5px solid var(--hairline);
  border-bottom-left-radius: 8px;
  box-shadow: var(--shadow-1);
}

/* Message action row */
.msg-tools { display: flex; gap: 4px; margin-top: 4px; opacity: 0; transition: opacity 200ms var(--ease-standard); }
.msg:hover .msg-tools, .msg:focus-within .msg-tools { opacity: 1; }
.msg-tools .icon-btn { width: 30px; height: 30px; border-radius: var(--radius-tag); }
.msg-tools .icon-btn svg { width: 14px; height: 14px; }
.copy-btn.copied { color: var(--green); }

/* Response-time label beside Copy on assistant replies */
.msg-time {
  align-self: center;
  margin-left: 2px;
  padding: 3px 8px;
  border-radius: var(--radius-tag);
  background: var(--fill);
  border: 0.5px solid var(--hairline);
  color: var(--text-3);
  font-size: 11px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  pointer-events: auto;
}
.msg-time:hover { color: var(--text-2); }

/* Follow-up suggestion chips under the latest assistant reply */
.followups {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.followup-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 8px 14px;
  border-radius: 100px;
  border: 0.5px solid var(--hairline);
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  color: var(--accent);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
  text-align: left;
  cursor: pointer;
  opacity: 0;
  animation: chipIn 420ms var(--ease-standard) both;
  transition: transform 200ms var(--ease-standard), box-shadow 200ms var(--ease-standard), background 200ms var(--ease-standard), border-color 200ms var(--ease-standard);
}
.followup-chip:nth-child(1) { animation-delay: 40ms; }
.followup-chip:nth-child(2) { animation-delay: 110ms; }
.followup-chip:nth-child(3) { animation-delay: 180ms; }
.followup-chip:nth-child(4) { animation-delay: 250ms; }
.followup-chip::before {
  content: '';
  flex: none;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}
.followup-chip:hover { transform: scale(1.03) translateY(-1px); box-shadow: var(--shadow-1); background: var(--glass-strong); border-color: var(--hairline-strong); }
.followup-chip:active { transform: scale(0.97); transition-duration: 80ms; }
.followup-chip span, .followup-chip { overflow-wrap: anywhere; }

/* Re-roll button on generated-image bubbles */
.reroll-btn { color: var(--text-2); }
.reroll-btn:hover { color: #b055f7; }
.reroll-btn.busy svg { animation: spin 800ms linear infinite; }
.reroll-btn:disabled { opacity: 0.5; }

/* Reasoning panel inside a bot message */
.think-block { margin-bottom: 8px; border-radius: 12px; border: 0.5px solid var(--hairline); background: var(--fill); overflow: hidden; }
.think-head {
  width: 100%;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  font-size: 13px; font-weight: 500;
  color: var(--text-2);
}
.think-head .chev { margin-left: auto; transition: transform 300ms var(--ease-standard); }
.think-block.open .think-head .chev { transform: rotate(180deg); }
.think-body {
  display: none;
  padding: 0 12px 12px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
  white-space: pre-wrap;
}
.think-block.open .think-body { display: block; }

/* Streaming caret */
.caret {
  display: inline-block;
  width: 8px; height: 16px;
  margin-left: 2px;
  vertical-align: -2px;
  border-radius: 2px;
  background: var(--accent);
  animation: blink 1s steps(1) infinite;
}

/* ============ Markdown ============ */
.md { line-height: 1.65; }
.md > * + * { margin-top: 12px; }
.md h1, .md h2, .md h3, .md h4 { letter-spacing: -0.022em; line-height: 1.2; font-weight: 600; margin-top: 24px; }
.md h1 { font-size: 1.5em; } .md h2 { font-size: 1.3em; } .md h3 { font-size: 1.15em; } .md h4 { font-size: 1em; }
.md ul, .md ol { padding-left: 28px; }
.md li + li { margin-top: 6px; }
.md a { color: var(--accent); text-decoration: none; }
.md a:hover { text-decoration: underline; }
.md blockquote { border-left: 3px solid var(--hairline-strong); padding-left: 16px; color: var(--text-2); }
.md code {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 7px;
  border-radius: 6px;
  border: 0.5px solid transparent;
}
.md pre {
  margin: 0;
  background: none;
  overflow-x: auto;
}
.md pre code {
  display: block;
  padding: 14px 16px;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.6;
  background: none;
  border: 0;
  border-radius: 0;
}
.md table { border-collapse: collapse; width: 100%; font-size: 14px; display: block; overflow-x: auto; }
.md th, .md td { border: 0.5px solid var(--hairline-strong); padding: 10px 14px; text-align: left; }
.md th { background: var(--fill); font-weight: 600; }
.md hr { border: 0; border-top: 0.5px solid var(--hairline-strong); margin: 24px 0; }
.md img { max-width: 100%; border-radius: 12px; }
.md del { color: var(--text-3); }

/* Xcode-style interactive code card */
.code-block {
  border: 0.5px solid var(--hairline);
  border-radius: 12px;
  background: var(--code-bg);
  overflow: hidden;
}
.code-block.wrap pre code { white-space: pre-wrap; overflow-x: hidden; word-break: break-word; }
.code-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 0.5px solid var(--hairline);
  background: var(--glass);
}
.traffic { display: inline-flex; gap: 6px; }
.traffic i { width: 10px; height: 10px; border-radius: 50%; }
.traffic i:nth-child(1) { background: #ff5f57; }
.traffic i:nth-child(2) { background: #febc2e; }
.traffic i:nth-child(3) { background: #28c840; }
.code-lang-name {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-3);
}
.code-actions { margin-left: auto; display: inline-flex; gap: 4px; }
.code-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 24px;
  padding: 0 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-2);
  transition: background 200ms var(--ease-standard), color 200ms var(--ease-standard);
}
.code-btn svg { width: 12px; height: 12px; }
.code-btn:hover { background: var(--fill-2); color: var(--text); }
.code-btn.copied { color: var(--green); }
.code-block .code-wrap-btn span { display: none; }
.code-block.wrap .code-wrap-btn { color: var(--accent); }

/* Interactive inline command chip */
.md code.cmd {
  cursor: pointer;
  color: var(--accent);
  background: rgba(0, 122, 255, 0.08);
  border-color: rgba(0, 122, 255, 0.22);
  padding: 2px 8px;
  transition: background 150ms var(--ease-standard), border-color 150ms var(--ease-standard), color 150ms var(--ease-standard);
}
.md code.cmd:hover { background: rgba(0, 122, 255, 0.14); border-color: rgba(0, 122, 255, 0.34); }
.md code.cmd.copied {
  color: var(--green);
  background: rgba(52, 199, 89, 0.12);
  border-color: rgba(52, 199, 89, 0.35);
}
.md code.cmd.copied::after { content: ' ✓'; }

/* Copyable shell command line */
.cmd-line {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.05);
  border: 0.5px solid var(--hairline);
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  transition: border-color 200ms var(--ease-standard), background 200ms var(--ease-standard);
}
html[data-theme="dark"] .cmd-line { background: rgba(255, 255, 255, 0.06); }
.cmd-line:hover { border-color: var(--hairline-strong); }
.cmd-line .cmd-prompt { flex: none; color: var(--green); font-weight: 600; }
.cmd-line code {
  flex: 1;
  min-width: 0;
  padding: 0;
  background: none;
  border: 0;
  color: var(--code-text);
  overflow-x: auto;
  cursor: pointer;
  white-space: pre;
}
.cmd-line code:hover { color: var(--accent); }
.cmd-line .cmd-copy { flex: none; }
.cmd-line .cmd-copy.copied { color: var(--green); }
.cmd-line .cmd-copy.copied span { color: var(--green); }

/* Clickable image */
.md .img-link {
  position: relative;
  display: inline-block;
  line-height: 0;
  border-radius: 12px;
  overflow: hidden;
}
.md .img-link img { transition: filter 200ms var(--ease-standard); }
.md .img-link .img-open {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  font-size: 13px;
  line-height: 1;
  opacity: 0;
  transition: opacity 150ms var(--ease-standard);
}
.md .img-link:hover img { filter: brightness(0.93); }
.md .img-link:hover .img-open, .md .img-link:focus-visible .img-open { opacity: 1; }

/* Image generation placeholder bubble */
.gen-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-radius: 12px;
  background: var(--fill);
  border: 0.5px solid var(--hairline);
  color: var(--text-2);
}
.gen-card .gen-spin {
  width: 20px; height: 20px;
  flex: none;
  border: 2px solid var(--hairline-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}
.gen-card.failed { color: var(--danger); border-color: var(--danger); }

/* Loading overlay on an image bubble whose pixels haven't arrived yet.
   The <a> gets .img-loading from imageMd(url, true); once the image loads,
   the whole bubble is rebuilt without the overlay. */
.img-link.img-loading { cursor: progress; }
.img-link.img-loading img { opacity: 0; }
.img-link .img-wait {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-radius: 12px;
  background: var(--fill);
  border: 0.5px solid var(--hairline);
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.3;
  overflow: hidden;
}
.img-link .img-wait .gen-spin {
  width: 26px;
  height: 26px;
  border: 2px solid var(--hairline-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}
.img-link .img-wait-label::after {
  content: '';
  animation: waitDots 1.5s steps(4, end) infinite;
}
@keyframes waitDots {
  0% { content: ''; }
  25% { content: '.'; }
  50% { content: '..'; }
  75% { content: '...'; }
  100% { content: ''; }
}

/* Image mode accents */
.composer.img-mode { border-color: rgba(176, 85, 247, 0.35); }
.composer.img-mode .send-btn { background: linear-gradient(135deg, #0a84ff, #b055f7); }

/* Syntax highlighting tokens (Xcode-inspired) */
html[data-theme="light"] .tok-comment { color: #8a9199; font-style: italic; }
html[data-theme="light"] .tok-string { color: #d12f1b; }
html[data-theme="light"] .tok-number { color: #272ad8; }
html[data-theme="light"] .tok-keyword { color: #ad3da4; }
html[data-theme="light"] .tok-func { color: #3e8087; }
html[data-theme="light"] .tok-key { color: #7d4c9e; }
html[data-theme="light"] .tok-prop { color: #3e8087; }
html[data-theme="light"] .tok-atrule { color: #ad3da4; }
html[data-theme="light"] .tok-tag { color: #3e8087; }
html[data-theme="light"] .tok-attr { color: #7d4c9e; }
html[data-theme="light"] .tok-variable { color: #272ad8; }

html[data-theme="dark"] .tok-comment { color: #7f8c98; font-style: italic; }
html[data-theme="dark"] .tok-string { color: #ff8170; }
html[data-theme="dark"] .tok-number { color: #d0bf69; }
html[data-theme="dark"] .tok-keyword { color: #ff7ab2; }
html[data-theme="dark"] .tok-func { color: #56b6c2; }
html[data-theme="dark"] .tok-key { color: #c792ea; }
html[data-theme="dark"] .tok-prop { color: #56b6c2; }
html[data-theme="dark"] .tok-atrule { color: #ff7ab2; }
html[data-theme="dark"] .tok-tag { color: #ff7ab2; }
html[data-theme="dark"] .tok-attr { color: #d0bf69; }
html[data-theme="dark"] .tok-variable { color: #99c4f5; }

/* Task-list checkboxes */
.md .task { display: inline-flex; align-items: flex-start; gap: 8px; }
.md .task .box {
  flex: none;
  width: 16px; height: 16px;
  margin-top: 3px;
  border-radius: 5px;
  border: 1.5px solid var(--text-3);
  display: inline-grid; place-items: center;
}
.md .task.done .box { background: var(--accent); border-color: var(--accent); }
.md .task.done .box::after {
  content: '';
  width: 8px; height: 5px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg) translate(0px, -1px);
}
.md .task.done > span:last-child { color: var(--text-3); text-decoration: line-through; }

/* ============ Welcome ============ */
.welcome { max-width: 640px; margin: 0 auto; padding: 48px 16px 24px; text-align: center; animation: msgIn 400ms var(--ease-standard) both; }
.welcome-mark {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  border-radius: 20px;
  box-shadow: var(--shadow-1);
}
.welcome-title { font-size: 28px; font-weight: 700; letter-spacing: -0.022em; line-height: 1.2; }
.welcome-sub { color: var(--text-2); margin-top: 8px; }
.suggestions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 24px; text-align: left; }
.suggestion {
  padding: 12px 16px;
  border-radius: var(--radius-card);
  background: var(--glass);
  border: 0.5px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  font-size: 14px;
  color: var(--text-2);
  transition: transform 200ms var(--ease-standard), box-shadow 200ms var(--ease-standard), color 200ms;
  animation: itemIn 400ms var(--ease-standard) both;
}
.suggestion:nth-child(2) { animation-delay: 50ms; }
.suggestion:nth-child(3) { animation-delay: 100ms; }
.suggestion:nth-child(4) { animation-delay: 150ms; }
.suggestion:hover { transform: scale(1.02); box-shadow: var(--shadow-1); color: var(--text); }
.suggestion:active { transform: scale(0.98); }

/* ============ Composer ============ */
.composer-zone { padding: 8px 24px calc(24px + env(safe-area-inset-bottom)); }

.reasoning-panel {
  max-width: 760px;
  margin: 0 auto 8px;
  border-radius: 12px;
  border: 0.5px solid var(--hairline);
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  overflow: hidden;
  animation: msgIn 250ms var(--ease-standard) both;
}
.reasoning-head {
  width: 100%;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px;
  font-size: 13px; font-weight: 500; color: var(--text-2);
}
.reasoning-head .chev { margin-left: auto; transition: transform 300ms var(--ease-standard); }
.reasoning-panel.closed .chev { transform: rotate(180deg); }
.reasoning-body {
  max-height: 160px;
  overflow-y: auto;
  padding: 0 16px 12px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
  white-space: pre-wrap;
}
.reasoning-panel.closed .reasoning-body { display: none; }

.composer {
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--radius-card);
  background: var(--glass-strong);
  border: 0.5px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-1);
  padding: 12px;
  transition: box-shadow 200ms var(--ease-standard), border-color 200ms var(--ease-standard);
}
.composer:focus-within { border-color: var(--hairline-strong); box-shadow: none; }

#input {
  display: block;
  width: 100%;
  max-height: 200px;
  padding: 10px 8px 4px;
  border: 0;
  background: none;
  resize: none;
  outline: none;
  font-size: 16px;
  line-height: 1.5;
}
#input:focus-visible, .composer:focus-within #input { outline: none; box-shadow: none; }
#input::placeholder { color: var(--text-3); }

.composer-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 4px 0; }
.composer-left { display: flex; align-items: center; gap: 10px; min-width: 0; }
.model-pill { max-width: 200px; }
/* Size pill only exists while image mode is on */
.size-pill { display: none; }
.composer.img-mode .size-pill { display: inline-flex; }
.size-pill[hidden] { display: none; }
.toggle[aria-checked="true"] { background: rgba(0, 122, 255, 0.15); color: var(--accent); }

.send-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent);
  color: var(--accent-contrast);
  box-shadow: var(--shadow-2);
  transition: transform 150ms var(--ease-standard), filter 200ms var(--ease-standard), background 200ms;
}
.send-btn:hover { filter: brightness(1.08); }
.send-btn:active { transform: scale(0.92); }
.send-btn:disabled { background: var(--fill-2); color: var(--text-3); box-shadow: none; cursor: default; transform: none; }
.send-btn .ico-stop { display: none; }
.send-btn.streaming { background: var(--text); color: var(--bg); }
.send-btn.streaming .ico-send { display: none; }
.send-btn.streaming .ico-stop { display: block; }

.hint { text-align: center; font-size: 12px; color: var(--text-3); padding: 8px 0 0; }

/* ============ Overlays: sheet + dialog ============ */
.overlay {
  position: fixed; inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: fadeIn 200ms var(--ease-standard) both;
}
.overlay[hidden] { display: none; }

.sheet {
  width: min(480px, 100%);
  max-height: min(560px, 80dvh);
  display: flex; flex-direction: column;
  border-radius: var(--radius-card);
  background: var(--glass-strong);
  border: 0.5px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-1);
  animation: sheetIn 300ms var(--ease-spring) both;
}
.sheet-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 16px 8px 24px; }
.sheet-head h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.022em; }
.sheet-body { overflow-y: auto; padding: 8px 16px 16px; display: flex; flex-direction: column; gap: 8px; }

.model-item {
  display: flex; align-items: center; gap: 12px;
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-btn);
  text-align: left;
  background: var(--fill);
  transition: background 200ms var(--ease-standard), transform 150ms var(--ease-standard);
  animation: itemIn 300ms var(--ease-standard) both;
}
.model-item:hover { background: var(--fill-2); }
.model-item:active { transform: scale(0.98); }
.model-item .mi-name { font-size: 15px; font-weight: 500; }
.model-item .mi-desc { font-size: 12px; color: var(--text-3); margin-top: 2px; }
.model-item .mi-icon {
  width: 32px; height: 32px;
  flex: none;
  display: grid; place-items: center;
  border-radius: 9px;
  background: rgba(0, 122, 255, 0.1);
  color: var(--accent);
}
.model-item .mi-check { margin-left: auto; color: var(--accent); opacity: 0; }
.model-item.selected { background: rgba(0, 122, 255, 0.12); }
.model-item.selected .mi-check { opacity: 1; }
.model-item.selected .mi-name { color: var(--accent); }

/* Image size sheet */
.size-note { font-size: 12px; color: var(--text-3); padding: 0 8px 4px; }
.size-item .mi-icon { background: rgba(176, 85, 247, 0.12); color: #b055f7; }
.size-item .mi-size {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}
.size-item.selected .mi-size { color: var(--accent); }
.size-item .mi-check { margin-left: 8px; }

.dialog {
  width: min(360px, 100%);
  border-radius: var(--radius-card);
  background: var(--glass-strong);
  border: 0.5px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-1);
  padding: 24px;
  animation: sheetIn 300ms var(--ease-spring) both;
}
.dialog h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.022em; text-align: center; }
.dialog p { font-size: 14px; color: var(--text-2); text-align: center; margin-top: 8px; }
.dialog-actions { display: flex; gap: 8px; margin-top: 24px; }
.dialog-actions .btn { flex: 1; }

.btn {
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-btn);
  background: var(--fill);
  font-size: 16px;
  font-weight: 500;
  transition: background 200ms var(--ease-standard), transform 150ms var(--ease-standard);
}
.btn:hover { background: var(--fill-2); }
.btn:active { transform: scale(0.96); }
.danger-btn { background: var(--danger); color: #fff; }
.danger-btn:hover { background: var(--danger); filter: brightness(1.08); }

.skel { height: 64px; border-radius: var(--radius-btn); background: var(--fill); animation: pulse 1.2s ease-in-out infinite; }

/* ============ Toasts ============ */
.toasts {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 200;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 0.5px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-1);
  font-size: 14px; font-weight: 500;
  animation: toastIn 300ms var(--ease-spring) both;
}
.toast.hide { animation: toastOut 250ms var(--ease-standard) both; }

/* ============ Animations ============ */
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes chipIn {
  from { opacity: 0; transform: translateY(10px) scale(0.88); }
  60%  { opacity: 1; transform: translateY(-2px) scale(1.04); }
  to   { opacity: 1; transform: none; }
}
@keyframes itemIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes sheetIn { from { opacity: 0; transform: scale(0.92); } to { opacity: 1; transform: scale(1); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes toastIn { from { opacity: 0; transform: translateY(16px) scale(0.95); } to { opacity: 1; transform: none; } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; transform: translateY(8px); } }
@keyframes blink { 50% { opacity: 0; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .sidebar { position: fixed; inset: 0 auto 0 0; transform: translateX(-100%); box-shadow: var(--shadow-1); }
  body.sidebar-open .sidebar { transform: none; }
  body.sidebar-open .scrim { opacity: 1; pointer-events: auto; }
  .suggestions { grid-template-columns: 1fr; }
  .bubble-col { max-width: calc(100% - 44px); }
  .messages { padding: 20px 12px 8px; }
  .composer-zone { padding: 8px 12px calc(12px + env(safe-area-inset-bottom)); }
  .model-pill { max-width: 130px; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}