/* ============================================================
   Kiro Chat — "Obsidian / Ember"
   Warm near-black, one ember accent, editorial type, sandbox canvas.
   ============================================================ */

:root {
  --bg:        #0c0a09;
  --bg-1:      #110e0c;
  --bg-2:      #17120f;
  --panel:     #131110;
  --panel-2:   #1b1714;
  --raise:     #221c18;
  --line:      rgba(255, 244, 230, 0.07);
  --line-2:    rgba(255, 244, 230, 0.12);
  --text:      #ece4d9;
  --muted:     #a59a8d;
  --faint:     #6f655b;

  --ember:     #ff6a35;
  --ember-2:   #ff8a4c;
  --ember-deep:#e0451d;
  --ember-soft: rgba(255, 106, 53, 0.13);
  --ember-line: rgba(255, 106, 53, 0.32);
  --ember-glow: rgba(255, 106, 53, 0.45);

  --mint:      #67d6a8;
  --mint-soft: rgba(103, 214, 168, 0.12);

  --font-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font:         'Hanken Grotesk', system-ui, sans-serif;
  --mono:         'JetBrains Mono', ui-monospace, monospace;

  --r-sm: 9px;
  --r:    14px;
  --r-lg: 20px;
  --sidebar-w: 268px;
  --shadow: 0 20px 60px -20px rgba(0,0,0,0.7);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow: hidden;
}
/* warm radial atmosphere + grain */
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(120% 80% at 82% -10%, rgba(255,106,53,0.10), transparent 55%),
    radial-gradient(90% 70% at 0% 110%, rgba(120,80,255,0.05), transparent 50%);
  pointer-events: none; z-index: 0;
}
body::after {
  content: "";
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.025; pointer-events: none; z-index: 0; mix-blend-mode: overlay;
}
.hidden { display: none !important; }

button { font-family: inherit; color: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }
::selection { background: var(--ember-soft); color: #fff; }

/* scrollbars */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: rgba(255,244,230,0.08); border-radius: 20px; border: 3px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: rgba(255,244,230,0.16); background-clip: padding-box; }

/* ============================ Brand ============================ */
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark { border-radius: 9px; box-shadow: 0 4px 18px -6px var(--ember-glow); }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-name {
  font-family: var(--font-display); font-weight: 700; letter-spacing: 0.14em;
  font-size: 15px; color: var(--text);
}
.brand-sub { font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ember-2); margin-top: 4px; font-weight: 600; }

/* ============================ Login ============================ */
.login {
  position: fixed; inset: 0; z-index: 50;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 26px;
}
.login-aura {
  position: absolute; width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,106,53,0.16), transparent 62%);
  filter: blur(20px); animation: breathe 7s ease-in-out infinite;
}
@keyframes breathe { 0%,100% { transform: scale(1); opacity: .8 } 50% { transform: scale(1.08); opacity: 1 } }
.login-card {
  position: relative; z-index: 1;
  width: min(92vw, 408px);
  background: linear-gradient(180deg, rgba(34,28,24,0.85), rgba(19,17,16,0.92));
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  padding: 34px 34px 30px;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,0.04);
  backdrop-filter: blur(14px);
  animation: rise 0.6s cubic-bezier(.2,.8,.2,1) both;
}
.brand--login { margin-bottom: 26px; }
.brand--login .brand-mark { width: 38px; height: 38px; }
.brand--login .brand-name { font-size: 18px; }
.login-title { font-family: var(--font-display); font-weight: 600; font-size: 30px; margin: 0 0 8px; letter-spacing: -0.02em; }
.login-desc { color: var(--muted); font-size: 14px; margin: 0 0 22px; line-height: 1.5; }
.field { position: relative; margin-bottom: 14px; }
.field input {
  width: 100%; background: var(--bg); border: 1px solid var(--line-2);
  color: var(--text); border-radius: var(--r); padding: 14px 16px; font-size: 15px;
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.field input:focus { border-color: var(--ember-line); box-shadow: 0 0 0 4px var(--ember-soft); }
.login-err { color: #ff7a6b; font-size: 13px; min-height: 18px; margin: 12px 2px 0; text-align: center; }
.login-foot { position: relative; z-index: 1; color: var(--faint); font-size: 12px; letter-spacing: 0.04em; }

/* ============================ Buttons ============================ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: var(--r); font-weight: 600; transition: transform .12s, background .18s, border-color .18s, box-shadow .18s; }
.btn:active { transform: translateY(1px) scale(0.99); }
.btn-block { width: 100%; }
.btn-primary {
  background: linear-gradient(180deg, var(--ember-2), var(--ember-deep));
  color: #1a0d06; padding: 14px; font-size: 15px; font-weight: 700;
  box-shadow: 0 10px 30px -10px var(--ember-glow), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-primary:hover { filter: brightness(1.06); box-shadow: 0 14px 38px -10px var(--ember-glow); }

/* ============================ App layout ============================ */
.app {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: var(--sidebar-w) minmax(0,1fr) 0;
  height: 100vh; transition: grid-template-columns .32s cubic-bezier(.4,0,.2,1);
}
.app.sidebar-collapsed { grid-template-columns: 0 minmax(0,1fr) var(--art-w, 0); }
.app.artifact-open { grid-template-columns: var(--sidebar-w) minmax(0,1fr) clamp(360px, 46vw, 760px); }
.app.artifact-open.sidebar-collapsed { grid-template-columns: 0 minmax(0,1fr) clamp(360px, 50vw, 820px); }

/* ============================ Sidebar ============================ */
.sidebar {
  background: linear-gradient(180deg, var(--bg-1), var(--bg));
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column;
  min-width: 0; overflow: hidden;
}
.sidebar-top { display: flex; align-items: center; justify-content: space-between; padding: 18px 16px 14px; }
.btn-new {
  margin: 2px 12px 8px; padding: 11px 13px;
  background: var(--panel-2); border: 1px solid var(--line-2); color: var(--text);
  border-radius: var(--r); font-size: 14px; justify-content: flex-start; gap: 10px;
}
.btn-new:hover { border-color: var(--ember-line); background: var(--raise); }
.btn-new kbd { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--faint); background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; }

.chat-list { flex: 1; overflow-y: auto; padding: 6px 8px; display: flex; flex-direction: column; gap: 2px; }
.chat-item {
  display: flex; align-items: center; gap: 9px; padding: 9px 11px; border-radius: 10px;
  color: var(--muted); font-size: 13.5px; cursor: pointer; border: 1px solid transparent;
  white-space: nowrap; overflow: hidden; position: relative;
}
.chat-item:hover { background: var(--panel); color: var(--text); }
.chat-item.is-active { background: var(--panel-2); color: var(--text); border-color: var(--line-2); }
.chat-item.is-active::before { content:""; position:absolute; left:0; top:18%; bottom:18%; width:2.5px; border-radius:3px; background: var(--ember); }
.chat-item .ci-title { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.chat-item .ci-del { opacity: 0; color: var(--faint); display: flex; transition: opacity .15s, color .15s; }
.chat-item:hover .ci-del { opacity: 1; }
.chat-item .ci-del:hover { color: #ff7a6b; }
.chat-empty { color: var(--faint); font-size: 12.5px; text-align: center; padding: 26px 12px; line-height: 1.6; }

.sidebar-foot { padding: 12px 16px 16px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; }
.status-dot { display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: var(--muted); letter-spacing: 0.02em; }
.status-dot span { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 0 var(--mint); animation: pulse 2.4s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(103,214,168,.5) } 70% { box-shadow: 0 0 0 6px rgba(103,214,168,0) } 100% { box-shadow: 0 0 0 0 rgba(103,214,168,0) } }
.ghost-link { background: none; border: none; color: var(--faint); font-size: 12.5px; padding: 4px; }
.ghost-link:hover { color: var(--ember-2); }

.icon-btn { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 10px; background: transparent; border: 1px solid transparent; color: var(--muted); transition: background .16s, color .16s, border-color .16s; }
.icon-btn:hover { background: var(--panel-2); color: var(--text); border-color: var(--line-2); }

/* ============================ Main ============================ */
.main { display: flex; flex-direction: column; min-width: 0; height: 100vh; }
.topbar {
  display: flex; align-items: center; gap: 14px; padding: 13px 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(12,10,9,0.7), rgba(12,10,9,0.2));
  backdrop-filter: blur(8px); position: relative; z-index: 5;
}
.chat-title { font-family: var(--font-display); font-weight: 600; font-size: 15px; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; letter-spacing: -0.01em; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }

.seg { display: inline-flex; background: var(--bg); border: 1px solid var(--line-2); border-radius: 11px; padding: 3px; gap: 2px; }
.seg-btn { background: transparent; border: none; color: var(--muted); font-size: 12.5px; font-weight: 600; padding: 6px 12px; border-radius: 8px; transition: background .16s, color .16s; }
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active { background: var(--raise); color: var(--text); box-shadow: inset 0 0 0 1px var(--line-2); }
.seg [data-mode="always"].is-active, .seg [data-mode="auto"].is-active { color: var(--ember-2); }
.seg--sm .seg-btn { padding: 5px 11px; font-size: 12px; }

/* ============================ Thread ============================ */
.thread { flex: 1; overflow-y: auto; scroll-behavior: smooth; }
.thread-inner, .welcome, .msg-row { width: 100%; }
.msg-row { display: flex; justify-content: center; padding: 6px 22px; }
.msg { width: 100%; max-width: 760px; display: flex; gap: 15px; padding: 14px 0; animation: rise .4s cubic-bezier(.2,.8,.2,1) both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.avatar { flex-shrink: 0; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 12px; font-weight: 700; font-family: var(--font-display); margin-top: 2px; }
.avatar.user { background: var(--panel-2); border: 1px solid var(--line-2); color: var(--muted); }
.avatar.ai { padding: 0; overflow: hidden; box-shadow: 0 4px 16px -6px var(--ember-glow); }
.avatar.ai img { width: 100%; height: 100%; }
.msg-body { min-width: 0; flex: 1; }
.msg-name { font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); font-weight: 700; margin-bottom: 4px; }
.msg.user .msg-name { color: var(--muted); }

/* prose */
.prose { color: var(--text); font-size: 15.5px; line-height: 1.72; word-wrap: break-word; overflow-wrap: anywhere; }
.prose > *:first-child { margin-top: 0; }
.prose > *:last-child { margin-bottom: 0; }
.prose p { margin: 0 0 14px; }
.prose h1, .prose h2, .prose h3, .prose h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; margin: 26px 0 12px; }
.prose h1 { font-size: 25px; } .prose h2 { font-size: 21px; } .prose h3 { font-size: 17.5px; } .prose h4 { font-size: 15.5px; }
.prose ul, .prose ol { margin: 0 0 15px; padding-left: 24px; }
.prose li { margin: 5px 0; }
.prose li::marker { color: var(--ember); }
.prose a { color: var(--ember-2); text-decoration: none; border-bottom: 1px solid var(--ember-line); }
.prose a:hover { border-bottom-color: var(--ember-2); }
.prose strong { color: #fff; font-weight: 700; }
.prose em { color: var(--text); }
.prose blockquote { margin: 0 0 15px; padding: 4px 16px; border-left: 3px solid var(--ember-line); color: var(--muted); background: var(--ember-soft); border-radius: 0 8px 8px 0; }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 24px 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 14px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line-2); padding: 8px 12px; text-align: left; }
.prose th { background: var(--panel-2); font-weight: 600; }
.prose code:not(pre code) { font-family: var(--mono); font-size: 0.86em; background: var(--panel-2); border: 1px solid var(--line); padding: 1.5px 6px; border-radius: 6px; color: var(--ember-2); }

/* citation chips inside prose: [1] */
.cite { display: inline-flex; align-items: center; justify-content: center; min-width: 17px; height: 17px; padding: 0 4px; margin: 0 1px; font-family: var(--mono); font-size: 10.5px; font-weight: 600; vertical-align: super; line-height: 1; color: var(--ember-2); background: var(--ember-soft); border: 1px solid var(--ember-line); border-radius: 5px; text-decoration: none; cursor: pointer; }
.cite:hover { background: var(--ember); color: #1a0d06; }

/* user bubble */
.msg.user .prose { background: var(--panel-2); border: 1px solid var(--line-2); padding: 11px 16px; border-radius: 4px 16px 16px 16px; }

/* code blocks */
.codeblock { margin: 0 0 16px; border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; background: #0a0908; }
.codeblock-head { display: flex; align-items: center; justify-content: space-between; padding: 7px 10px 7px 14px; background: var(--panel); border-bottom: 1px solid var(--line); }
.codeblock-lang { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }
.codeblock-actions { display: flex; gap: 6px; }
.cb-btn { display: inline-flex; align-items: center; gap: 5px; font-size: 11.5px; font-weight: 600; color: var(--muted); background: var(--panel-2); border: 1px solid var(--line-2); padding: 4px 9px; border-radius: 7px; transition: all .15s; }
.cb-btn:hover { color: var(--text); border-color: var(--line-2); background: var(--raise); }
.cb-btn.run { color: var(--ember-2); border-color: var(--ember-line); background: var(--ember-soft); }
.cb-btn.run:hover { background: var(--ember); color: #1a0d06; }
.codeblock pre { margin: 0; padding: 15px 16px; overflow-x: auto; }
.codeblock code { font-family: var(--mono); font-size: 13px; line-height: 1.6; background: none !important; padding: 0 !important; border: none !important; color: #d9d2c7; }

/* artifact card in chat */
.artifact-card { display: flex; align-items: center; gap: 14px; margin: 2px 0 16px; padding: 14px 16px; background: linear-gradient(135deg, var(--panel-2), var(--panel)); border: 1px solid var(--ember-line); border-radius: var(--r); cursor: pointer; transition: transform .14s, box-shadow .2s; }
.artifact-card:hover { transform: translateY(-1px); box-shadow: 0 12px 30px -16px var(--ember-glow); }
.artifact-card-ico { width: 40px; height: 40px; border-radius: 11px; background: linear-gradient(180deg, var(--ember-2), var(--ember-deep)); display: grid; place-items: center; color: #1a0d06; flex-shrink: 0; box-shadow: inset 0 1px 0 rgba(255,255,255,.3); }
.artifact-card-meta { flex: 1; min-width: 0; }
.artifact-card-title { font-weight: 600; font-size: 14.5px; color: var(--text); }
.artifact-card-sub { font-size: 12.5px; color: var(--muted); }
.artifact-card-cta { font-size: 12.5px; font-weight: 600; color: var(--ember-2); display: flex; align-items: center; gap: 5px; }

/* tool / search status */
.tool-chip { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 14px; padding: 8px 13px; background: var(--panel); border: 1px solid var(--line-2); border-radius: 11px; font-size: 13px; color: var(--muted); }
.tool-chip.searching { border-color: var(--ember-line); }
.tool-chip .spinner { width: 13px; height: 13px; border: 2px solid var(--ember-line); border-top-color: var(--ember); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.tool-chip b { color: var(--text); font-weight: 600; }

/* ============================ Thinking / reasoning ============================ */
.msg-thinking:empty { display: none; }
.thinking {
  margin: 2px 0 16px; border: 1px solid var(--line-2); border-radius: 12px;
  background: var(--panel); overflow: hidden;
  transition: border-color .25s, box-shadow .25s;
}
.thinking.live { border-color: var(--ember-line); box-shadow: 0 0 0 3px var(--ember-soft); }
.thinking-head {
  display: flex; align-items: center; gap: 9px; width: 100%;
  padding: 9px 13px; background: transparent; border: none; text-align: left;
  font-family: var(--font); font-size: 12.5px; font-weight: 600; color: var(--muted);
  letter-spacing: .01em; transition: color .15s;
}
.thinking-head:hover { color: var(--text); }
.thinking-ico { color: var(--ember); flex-shrink: 0; }
.thinking.live .thinking-ico { animation: think-pulse 1.5s ease-in-out infinite; }
@keyframes think-pulse { 0%,100% { opacity:.45; transform: scale(.86); } 50% { opacity:1; transform: scale(1.06); } }
.thinking-label { white-space: nowrap; }
.thinking.live .thinking-label::after { content: '…'; }
.thinking-time { color: var(--faint); font-weight: 600; font-variant-numeric: tabular-nums; }
.thinking-chev { margin-left: auto; color: var(--faint); transition: transform .25s; flex-shrink: 0; }
.thinking.collapsed .thinking-chev { transform: rotate(-90deg); }
.thinking-body {
  padding: 10px 14px 13px; margin: 0; border-top: 1px solid var(--line);
  font-family: var(--font); font-size: 13px; line-height: 1.62; color: var(--muted);
  white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere;
  max-height: 340px; overflow-y: auto;
}
.thinking.collapsed .thinking-body { display: none; }

/* sources */
.sources { margin: 2px 0 16px; }
.sources-head { display: flex; align-items: center; gap: 8px; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); font-weight: 700; margin-bottom: 9px; }
.sources-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 8px; }
.source { display: flex; gap: 9px; padding: 9px 11px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--text); transition: border-color .15s, background .15s, transform .12s; overflow: hidden; }
.source:hover { border-color: var(--ember-line); background: var(--panel-2); transform: translateY(-1px); }
.source-num { flex-shrink: 0; width: 18px; height: 18px; border-radius: 5px; background: var(--ember-soft); color: var(--ember-2); font-family: var(--mono); font-size: 10.5px; font-weight: 600; display: grid; place-items: center; margin-top: 1px; }
.source-meta { min-width: 0; }
.source-title { font-size: 12.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.3; }
.source-dom { display: flex; align-items: center; gap: 5px; font-size: 11px; color: var(--faint); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.source-dom img { width: 12px; height: 12px; border-radius: 3px; }

/* streaming caret */
.caret { display: inline-block; width: 8px; height: 1.05em; transform: translateY(2px); margin-left: 1px; background: var(--ember); border-radius: 1px; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* pre-first-token reasoning pulse: a light sweeps the word while Kiro buffers before the first token */
.think-wait {
  display: inline-block; font-size: 15px; font-weight: 600; letter-spacing: .005em;
  background: linear-gradient(100deg, var(--muted) 34%, var(--ember) 50%, var(--muted) 66%);
  background-size: 220% 100%; background-position: 130% 0;
  -webkit-background-clip: text; background-clip: text;
  color: transparent; -webkit-text-fill-color: transparent;
  animation: think-sweep 1.7s linear infinite;
}
@keyframes think-sweep { to { background-position: -30% 0; } }
.retry-note { font-size: 13px; font-weight: 500; color: var(--faint); }

/* welcome */
.welcome { max-width: 760px; margin: 0 auto; padding: clamp(40px, 9vh, 96px) 24px 30px; text-align: center; }
.welcome-mark { display: inline-grid; place-items: center; margin-bottom: 22px; animation: floaty 6s ease-in-out infinite; }
.welcome-mark img { filter: drop-shadow(0 12px 30px var(--ember-glow)); }
@keyframes floaty { 0%,100% { transform: translateY(0) } 50% { transform: translateY(-7px) } }
.welcome-title { font-family: var(--font-display); font-weight: 700; font-size: clamp(28px, 4.5vw, 40px); margin: 0 0 12px; letter-spacing: -0.025em; background: linear-gradient(180deg, #fff, #c9beb0); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.welcome-sub { color: var(--muted); font-size: 15.5px; max-width: 520px; margin: 0 auto 30px; line-height: 1.6; }
.suggestions { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; text-align: left; }
.sg { display: flex; align-items: center; gap: 11px; padding: 15px 16px; background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r); color: var(--text); font-size: 14px; font-weight: 500; transition: transform .14s, border-color .18s, background .18s; }
.sg:hover { transform: translateY(-2px); border-color: var(--ember-line); background: var(--panel-2); }
.sg-k { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ember-2); background: var(--ember-soft); border: 1px solid var(--ember-line); padding: 3px 7px; border-radius: 6px; flex-shrink: 0; }

/* ============================ Composer ============================ */
.composer-wrap { padding: 0 22px 16px; }
.composer { position: relative; max-width: 802px; margin: 0 auto; background: var(--panel); border: 1px solid var(--line-2); border-radius: var(--r-lg); padding: 6px; transition: border-color .2s, box-shadow .2s; }
.composer:focus-within { border-color: var(--ember-line); box-shadow: 0 0 0 4px var(--ember-soft), var(--shadow); }
.composer-glow { position: absolute; inset: -1px; border-radius: var(--r-lg); background: radial-gradient(60% 120% at 50% 120%, var(--ember-soft), transparent 70%); opacity: 0; transition: opacity .3s; pointer-events: none; }
.composer:focus-within .composer-glow { opacity: 1; }
.input { width: 100%; background: transparent; border: none; outline: none; resize: none; color: var(--text); font-size: 15.5px; line-height: 1.5; padding: 22px 14px 6px; max-height: 240px; }
.input::placeholder { color: var(--faint); }
.composer-bar { display: flex; align-items: center; justify-content: space-between; padding: 4px 14px; }
.composer-hint { font-size: 12px; color: var(--faint); display: flex; align-items: center; gap: 7px; }
.composer-hint::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--ember); }
.composer-hint.off::before { background: var(--faint); }
.composer-right { display: flex; align-items: center; gap: 8px; }
.btn-send { width: 38px; height: 38px; padding: 0; border-radius: 11px; background: linear-gradient(180deg, var(--ember-2), var(--ember-deep)); color: #1a0d06; box-shadow: 0 6px 18px -8px var(--ember-glow), inset 0 1px 0 rgba(255,255,255,0.3); }
.btn-send:hover { filter: brightness(1.07); }
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; filter: grayscale(0.4); }
.btn-stop { padding: 8px 14px; border-radius: 11px; background: var(--panel-2); border: 1px solid var(--line-2); color: var(--text); font-size: 13px; }
.btn-stop:hover { border-color: #ff7a6b; color: #ff9a8c; }
.composer-foot { text-align: center; font-size: 11.5px; color: var(--faint); margin-top: 10px; }

/* ---- image attachments ---- */
.composer-left { display: flex; align-items: center; gap: 10px; }
.attach-btn { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 10px; background: transparent; border: 1px solid var(--line-2); color: var(--muted); transition: color .15s, border-color .15s, background .15s; }
.attach-btn:hover { color: var(--ember-2); border-color: var(--ember-line); background: var(--ember-soft); }
.attachments { display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 8px 2px; }
.attachments:empty { display: none; }
.att { position: relative; width: 60px; height: 60px; border-radius: 10px; overflow: hidden; border: 1px solid var(--line-2); background: var(--bg); flex-shrink: 0; }
.att img { width: 100%; height: 100%; object-fit: cover; display: block; }
.att .att-spin { position: absolute; inset: 0; margin: auto; width: 16px; height: 16px; border: 2px solid var(--ember-line); border-top-color: var(--ember); border-radius: 50%; animation: spin .8s linear infinite; }
.att-del { position: absolute; top: 3px; right: 3px; width: 18px; height: 18px; border-radius: 6px; background: rgba(12,10,9,.82); border: 1px solid var(--line-2); color: #fff; display: grid; place-items: center; cursor: pointer; opacity: 0; transition: opacity .15s, background .15s; padding: 0; }
.att:hover .att-del { opacity: 1; }
.att-del:hover { background: var(--ember-deep); }

/* images inside a sent user message */
.msg-images { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.msg-images a { display: block; border-radius: 12px; overflow: hidden; border: 1px solid var(--line-2); line-height: 0; }
.msg-images img { display: block; max-width: 260px; max-height: 260px; width: auto; height: auto; }

/* drag-to-attach overlay */
.drop-overlay { position: fixed; inset: 0; z-index: 45; background: rgba(12,10,9,.82); backdrop-filter: blur(6px); display: grid; place-items: center; animation: rise .15s ease both; }
.drop-inner { display: flex; flex-direction: column; align-items: center; gap: 14px; color: var(--ember-2); font-family: var(--font-display); font-size: 20px; font-weight: 600; padding: clamp(36px,7vw,56px) clamp(48px,10vw,80px); border: 2px dashed var(--ember-line); border-radius: 24px; background: var(--ember-soft); }

/* ============================ Artifact canvas ============================ */
.artifact { min-width: 0; background: var(--bg-1); border-left: 1px solid var(--line-2); display: flex; flex-direction: column; overflow: hidden; }
.artifact-head { display: flex; align-items: center; gap: 12px; padding: 11px 14px; border-bottom: 1px solid var(--line); background: var(--panel); }
.artifact-title { display: flex; align-items: center; gap: 9px; font-family: var(--font-display); font-weight: 600; font-size: 14px; flex: 1; min-width: 0; }
.artifact-title #artifact-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.artifact-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ember); box-shadow: 0 0 10px var(--ember-glow); flex-shrink: 0; }
.artifact-actions { display: flex; gap: 3px; }
.artifact-body { flex: 1; position: relative; min-height: 0; }
.artifact-frame { width: 100%; height: 100%; border: none; background: #fff; display: block; }
.artifact-code { margin: 0; height: 100%; overflow: auto; padding: 16px 18px; background: #0a0908; }
.artifact-code code { font-family: var(--mono); font-size: 12.5px; line-height: 1.6; background: none !important; }

/* mobile artifact = overlay */
@media (max-width: 880px) {
  .app, .app.artifact-open, .app.sidebar-collapsed { grid-template-columns: 0 1fr 0 !important; }
  .sidebar { position: fixed; z-index: 30; width: var(--sidebar-w); height: 100vh; transform: translateX(-100%); transition: transform .3s; }
  .app:not(.sidebar-collapsed) .sidebar { transform: none; box-shadow: var(--shadow); }
  .artifact { position: fixed; inset: 0; z-index: 40; border: none; transform: translateX(100%); transition: transform .3s; }
  .app.artifact-open .artifact { transform: none; }
  .suggestions { grid-template-columns: 1fr; }
  .msg-row { padding: 6px 14px; }
}

/* toast */
.toast { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--raise); border: 1px solid var(--line-2); color: var(--text); padding: 10px 18px; border-radius: 12px; font-size: 13.5px; z-index: 60; opacity: 0; transition: all .25s; box-shadow: var(--shadow); pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   Theme toggle (sun / moon) — shared between topbar + login
   ============================================================ */
:root { color-scheme: dark; }
.theme-toggle svg { transition: transform .45s cubic-bezier(.2,.8,.2,1); }
.theme-toggle:hover svg { transform: rotate(-22deg); }
.theme-toggle .moon { display: none; }
.theme-toggle .sun  { display: inline-flex; }
.login-theme-toggle {
  position: fixed; top: 16px; right: 16px; z-index: 51;
  background: var(--panel); border: 1px solid var(--line-2);
  box-shadow: 0 8px 22px -14px rgba(0,0,0,.6);
}

/* a branded, theme-agnostic keyboard focus ring for buttons + links only.
   Text inputs (composer, login) have their own focus-within treatment, so
   they are intentionally excluded to avoid a hard double outline. */
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--ember); outline-offset: 2px;
}
:focus:not(:focus-visible) { outline: none; }
.input:focus, .input:focus-visible, .field input:focus, .field input:focus-visible { outline: none; }

/* smooth cross-fade applied only during a theme flip (added/removed by JS) */
.theme-anim, .theme-anim *, .theme-anim *::before, .theme-anim *::after {
  transition:
    background-color .42s ease, color .42s ease, border-color .42s ease,
    box-shadow .42s ease, fill .42s ease, stroke .42s ease !important;
}

/* ============================================================
   Light theme — "Parchment / Ember"
   The same ember soul, in daylight. Warm paper, ink-brown type,
   a deepened ember that survives on light. Code stays on ink.
   ============================================================ */
:root[data-theme="light"] {
  color-scheme: light;

  --bg:        #f5efe5;
  --bg-1:      #efe8da;
  --bg-2:      #e8dfce;
  --panel:     #fcf9f2;
  --panel-2:   #f2eadc;
  --raise:     #ebe1ce;
  --line:      rgba(58, 42, 26, 0.10);
  --line-2:    rgba(58, 42, 26, 0.17);
  --text:      #2a2118;
  --muted:     #6b5c4a;
  --faint:     #9a8975;

  --ember:     #e0521d;
  --ember-2:   #b8400f;
  --ember-deep:#9c3409;
  --ember-soft: rgba(224, 82, 29, 0.11);
  --ember-line: rgba(224, 82, 29, 0.30);
  --ember-glow: rgba(224, 82, 29, 0.30);

  --mint:      #2e9a6b;
  --mint-soft: rgba(46, 154, 107, 0.14);

  --shadow: 0 22px 55px -26px rgba(58, 38, 16, 0.32);
}
.theme-toggle .sun  { display: inline-flex; }
:root[data-theme="light"] .theme-toggle .sun  { display: none; }
:root[data-theme="light"] .theme-toggle .moon { display: inline-flex; }

/* atmosphere + grain, retuned for paper */
:root[data-theme="light"] body::before {
  background:
    radial-gradient(120% 80% at 82% -10%, rgba(224,82,29,0.12), transparent 55%),
    radial-gradient(90% 70% at 0% 110%, rgba(120,80,255,0.045), transparent 50%);
}
:root[data-theme="light"] body::after { mix-blend-mode: multiply; opacity: 0.018; }

:root[data-theme="light"] ::selection { background: var(--ember-soft); color: var(--ember-deep); }
:root[data-theme="light"] *::-webkit-scrollbar-thumb { background: rgba(58,42,26,0.16); }
:root[data-theme="light"] *::-webkit-scrollbar-thumb:hover { background: rgba(58,42,26,0.30); }

/* surfaces that hardcoded dark rgba */
:root[data-theme="light"] .topbar {
  background: linear-gradient(180deg, rgba(245,239,229,0.82), rgba(245,239,229,0.28));
}
:root[data-theme="light"] .login-card {
  background: linear-gradient(180deg, rgba(255,253,248,0.92), rgba(247,241,231,0.95));
}
:root[data-theme="light"] .drop-overlay { background: rgba(245,239,229,0.80); }

/* primary actions: bright ember + white text reads best on paper */
:root[data-theme="light"] .btn-primary,
:root[data-theme="light"] .btn-send,
:root[data-theme="light"] .artifact-card-ico {
  background: linear-gradient(180deg, #f4631f, #d8430f);
  color: #fff;
}
:root[data-theme="light"] .cite:hover { color: #fff; }

/* in-message code blocks stay one self-contained dark unit on parchment.
   Re-scoping the dark tokens onto the toolbar makes lang label + buttons
   inherit the dark treatment with no per-element overrides. */
:root[data-theme="light"] .codeblock { border-color: rgba(58,42,26,0.12); }
:root[data-theme="light"] .codeblock-head {
  --panel: #131110; --panel-2: #1b1714; --raise: #221c18;
  --line: rgba(255,244,230,0.07); --line-2: rgba(255,244,230,0.12);
  --text: #ece4d9; --muted: #a59a8d; --faint: #6f655b;
  --ember: #ff6a35; --ember-2: #ff8a4c;
  --ember-soft: rgba(255,106,53,0.13); --ember-line: rgba(255,106,53,0.32);
}

/* text that assumed a dark backdrop */
:root[data-theme="light"] .prose strong { color: #1b140d; }
:root[data-theme="light"] .welcome-title {
  background: linear-gradient(168deg, #2a2118 8%, #9a5a2a 96%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

/* light-tint reds -> deepened so they hold on parchment */
:root[data-theme="light"] .login-err,
:root[data-theme="light"] .chat-item .ci-del:hover { color: #c8341f; }
:root[data-theme="light"] .btn-stop:hover { border-color: #c8341f; color: #b22e1b; }