/* ─── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ─── Default Dark Theme ────────────────────────────────── */
:root {
  --bg:          #141414;
  --surface:     #1e1e1e;
  --surface-2:   #272727;
  --surface-3:   #303030;
  --border:      rgba(255,255,255,0.07);
  --border-mid:  rgba(255,255,255,0.12);
  --text:        #e8e8e8;
  --text-2:      #9a9a9a;
  --text-3:      #606060;
  --accent:      #76b900;
  --accent-dim:  rgba(118,185,0,0.12);
  --accent-glow: rgba(118,185,0,0.25);
  --danger:      #e05252;
  --danger-dim:  rgba(224,82,82,0.1);
  --user-bubble: #2a2a2a;
  --radius:      14px;
  --radius-sm:   8px;
  --radius-xs:   5px;
  --header-h:    56px;
  --input-pb:    env(safe-area-inset-bottom, 12px);
  --transition:  0.18s cubic-bezier(0.4,0,0.2,1);
  --font-mono:   'DM Mono', 'Fira Code', monospace;
}

/* ─── Midnight Blue Theme ───────────────────────────────── */
body.theme-midnight {
  --bg:          #0d1117;
  --surface:     #161b22;
  --surface-2:   #1c2330;
  --surface-3:   #21293a;
  --border:      rgba(99,152,255,0.08);
  --border-mid:  rgba(99,152,255,0.15);
  --text:        #cdd9e5;
  --text-2:      #768390;
  --text-3:      #4a5565;
  --accent:      #6399ff;
  --accent-dim:  rgba(99,153,255,0.12);
  --accent-glow: rgba(99,153,255,0.22);
  --user-bubble: #1c2330;
}

/* ─── OLED Black Theme ──────────────────────────────────── */
body.theme-oled {
  --bg:          #000000;
  --surface:     #0a0a0a;
  --surface-2:   #111111;
  --surface-3:   #1a1a1a;
  --border:      rgba(255,255,255,0.05);
  --border-mid:  rgba(255,255,255,0.09);
  --text:        #f0f0f0;
  --text-2:      #888888;
  --text-3:      #444444;
  --accent:      #76b900;
  --accent-dim:  rgba(118,185,0,0.1);
  --user-bubble: #111111;
}

html, body {
  height: 100%;
  width: 100%;
  position: fixed; /* CRITICAL: Prevents mobile bounce/elastic scrolling */
  inset: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── Gate Overlay ──────────────────────────────────────── */
.gate-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.gate-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.gate-card {
  background: var(--surface);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  padding: 36px 32px;
  width: min(340px, 90vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  animation: fadeUp 0.35s ease both;
}

.gate-logo {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border-mid);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  margin-bottom: 2px;
}

.gate-title {
  font-size: 17px; font-weight: 600; color: var(--text);
}

.gate-sub {
  font-size: 13px; color: var(--text-3); text-align: center; line-height: 1.5;
}

.gate-card .text-input {
  text-align: center;
  letter-spacing: 0.08em;
}

.gate-submit-btn {
  width: 100%;
  border-radius: var(--radius-sm);
  height: 40px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 500;
  justify-content: center;
  cursor: pointer;
}

.gate-error {
  font-size: 12.5px;
  color: var(--danger);
  text-align: center;
  min-height: 18px;
  transition: opacity var(--transition);
}

/* ─── App Shell ─────────────────────────────────────────── */
.app-shell {
  display: flex;
  flex-direction: column;
  position: absolute;
  inset: 0; /* Anchored strictly to top, right, bottom, left */
  overflow: hidden;
}

/* ─── Header ────────────────────────────────────────────── */
.app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

.header-center { flex: 1; text-align: center; padding: 0 8px; overflow: hidden; }
.header-model-name {
  font-size: 13.5px; font-weight: 500; color: var(--text-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  display: block; letter-spacing: 0.01em;
}

.icon-btn {
  width: 36px; height: 36px; border: none; background: transparent;
  color: var(--text-2); border-radius: var(--radius-sm); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn:active { background: var(--surface-3); }

/* ─── Chat Container ────────────────────────────────────── */
.chat-container {
  flex: 1;
  min-height: 0; /* CRITICAL: Prevents flex children from overflowing bounds */
  overflow-y: auto; overflow-x: hidden;
  overscroll-behavior: contain; -webkit-overflow-scrolling: touch;
  padding: 20px 0 8px;
}

/* ─── Welcome State ─────────────────────────────────────── */
.welcome-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 10px; padding: 60px 32px;
  text-align: center; animation: fadeUp 0.4s ease both;
}
.welcome-state.hidden { display: none; }
.welcome-icon {
  width: 56px; height: 56px; border-radius: 50%; background: var(--surface-2);
  border: 1px solid var(--border-mid); display: flex; align-items: center;
  justify-content: center; color: var(--text-3); margin-bottom: 4px;
}
.welcome-title { font-size: 17px; font-weight: 500; color: var(--text); }
.welcome-sub { font-size: 13.5px; color: var(--text-3); max-width: 240px; }

/* ─── Messages ──────────────────────────────────────────── */
.messages-list {
  display: flex; flex-direction: column; gap: 2px;
  padding: 0 12px; max-width: 720px; margin: 0 auto; width: 100%;
}

.message {
  display: flex; gap: 10px; padding: 6px 0;
  animation: fadeUp 0.22s ease both;
}
.message.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600; margin-top: 4px; letter-spacing: 0.02em;
}
.message.user .msg-avatar { background: var(--accent); color: #0a0a0a; }
.message.assistant .msg-avatar {
  background: var(--surface-3); border: 1px solid var(--border-mid); color: var(--text-2);
}

.msg-col { display: flex; flex-direction: column; max-width: min(75%, 560px); }
.message.user .msg-col { align-items: flex-end; }
.message.assistant .msg-col { align-items: flex-start; }

.msg-bubble {
  padding: 10px 14px; border-radius: var(--radius);
  font-size: 14.5px; line-height: 1.65; position: relative;
}
.message.user .msg-bubble {
  background: var(--user-bubble); border: 1px solid var(--border-mid);
  border-bottom-right-radius: 4px; color: var(--text);
}
.message.assistant .msg-bubble {
  background: transparent; border: none; padding-left: 2px;
  border-bottom-left-radius: 4px; color: var(--text);
}

/* Image attachments in user bubble */
.msg-attachments { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.msg-img-thumb {
  max-width: 200px; max-height: 150px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-mid); object-fit: cover;
}

/* Metadata row under AI bubble */
.msg-meta {
  display: flex; align-items: center; gap: 10px; padding: 3px 2px 0;
  opacity: 0; transition: opacity 0.2s;
}
.message:hover .msg-meta, .message:focus-within .msg-meta { opacity: 1; }
.meta-time {
  font-size: 11px; color: var(--text-3); font-family: var(--font-mono);
}
.meta-copy {
  background: transparent; border: none; cursor: pointer; color: var(--text-3);
  display: flex; align-items: center; gap: 4px; font-size: 11px;
  font-family: inherit; padding: 2px 5px; border-radius: var(--radius-xs);
  transition: background var(--transition), color var(--transition);
}
.meta-copy:hover { background: var(--surface-2); color: var(--text-2); }
.meta-copy svg { flex-shrink: 0; }

/* Markdown */
.msg-bubble p { margin: 0 0 10px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble h1,.msg-bubble h2,.msg-bubble h3 { font-weight: 600; margin: 14px 0 6px; }
.msg-bubble h1 { font-size: 17px; } .msg-bubble h2 { font-size: 15.5px; } .msg-bubble h3 { font-size: 14.5px; }
.msg-bubble ul,.msg-bubble ol { padding-left: 20px; margin: 8px 0; }
.msg-bubble li { margin: 3px 0; }
.msg-bubble strong { font-weight: 600; }
.msg-bubble em { font-style: italic; color: var(--text-2); }
.msg-bubble a { color: var(--accent); text-decoration: none; }
.msg-bubble a:hover { text-decoration: underline; }
.msg-bubble hr { border: none; border-top: 1px solid var(--border); margin: 12px 0; }
.msg-bubble blockquote {
  border-left: 3px solid var(--accent); padding-left: 12px;
  margin: 8px 0; color: var(--text-2); font-style: italic;
}
.msg-bubble code {
  font-family: var(--font-mono); font-size: 13px;
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 1px 5px; border-radius: var(--radius-xs); color: var(--accent);
}
.msg-bubble pre {
  background: var(--surface); border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm); padding: 14px; overflow-x: auto; margin: 10px 0;
}
.msg-bubble pre code {
  background: none; border: none; padding: 0;
  color: #d4d4d4; font-size: 12.5px; line-height: 1.6;
}

/* Error bubble variant */
.msg-bubble.error-bubble {
  background: var(--danger-dim);
  border: 1px solid rgba(224,82,82,0.25);
  border-radius: var(--radius);
  padding: 10px 14px;
}
.error-bubble .error-title {
  font-size: 13px; font-weight: 600; color: var(--danger);
  margin-bottom: 4px; display: flex; align-items: center; gap: 6px;
}
.error-bubble .error-body {
  font-size: 13px; color: var(--text-2); line-height: 1.55;
}
.error-bubble .error-code {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--text-3);
  margin-top: 6px; padding: 6px 8px; background: var(--surface-2);
  border-radius: var(--radius-xs); display: block; word-break: break-all;
}

/* Streaming cursor */
.streaming-cursor::after {
  content: '▋'; color: var(--accent);
  animation: blink 1s steps(1) infinite; margin-left: 2px;
}

/* Thinking dots */
.thinking-dots { display: flex; gap: 5px; align-items: center; padding: 10px 2px; }
.thinking-dots span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--text-3);
  animation: pulse 1.2s ease-in-out infinite;
}
.thinking-dots span:nth-child(2) { animation-delay: 0.2s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.4s; }

/* ─── Input Area ─────────────────────────────────────────── */
.input-area {
  flex-shrink: 0; padding: 8px 12px;
  padding-bottom: calc(8px + var(--input-pb));
  background: var(--bg); border-top: 1px solid var(--border);
}

/* Attachment strip */
.attachment-strip {
  max-width: 720px; margin: 0 auto 6px;
  display: flex; flex-wrap: wrap; gap: 6px;
}
.attachment-strip:empty { margin-bottom: 0; }

.attach-chip {
  display: flex; align-items: center; gap: 5px;
  background: var(--surface-2); border: 1px solid var(--border-mid);
  border-radius: 20px; padding: 3px 8px 3px 5px; max-width: 160px;
  animation: fadeUp 0.18s ease both;
}
.attach-chip img {
  width: 22px; height: 22px; border-radius: 4px; object-fit: cover; flex-shrink: 0;
}
.attach-chip-icon {
  width: 22px; height: 22px; border-radius: 4px; background: var(--surface-3);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--text-3);
}
.attach-chip-name {
  font-size: 11.5px; color: var(--text-2); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; flex: 1;
}
.attach-chip-remove {
  background: transparent; border: none; cursor: pointer; color: var(--text-3);
  padding: 0; display: flex; align-items: center; flex-shrink: 0;
  transition: color var(--transition);
}
.attach-chip-remove:hover { color: var(--danger); }

.input-wrapper {
  max-width: 720px; margin: 0 auto; display: flex; align-items: flex-end; gap: 8px;
  background: var(--surface); border: 1px solid var(--border-mid);
  border-radius: var(--radius); padding: 8px 8px 8px 10px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-wrapper:focus-within {
  border-color: rgba(118,185,0,0.4); box-shadow: 0 0 0 3px var(--accent-dim);
}
body.theme-midnight .input-wrapper:focus-within {
  border-color: rgba(99,153,255,0.4); box-shadow: 0 0 0 3px rgba(99,153,255,0.1);
}

.attach-btn {
  width: 30px; height: 30px; border: none; background: transparent;
  color: var(--text-3); border-radius: var(--radius-xs); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background var(--transition), color var(--transition);
}
.attach-btn:hover { background: var(--surface-2); color: var(--text-2); }

#messageInput {
  flex: 1; background: transparent; border: none; outline: none; resize: none;
  color: var(--text); font-family: inherit; font-size: 15px; line-height: 1.5;
  max-height: 160px; overflow-y: auto; caret-color: var(--accent);
}
#messageInput::placeholder { color: var(--text-3); }
#messageInput::-webkit-scrollbar { width: 3px; }
#messageInput::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 2px; }

/* ── Send and Stop buttons ────────────────────────────────── */
.send-btn {
  width: 34px; height: 34px; border-radius: 9px; border: none;
  background: var(--accent); color: #0a0a0a; cursor: pointer;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}
.send-btn:hover:not(:disabled) { filter: brightness(1.12); }
.send-btn:active:not(:disabled) { transform: scale(0.93); }
.send-btn:disabled { background: var(--surface-3); color: var(--text-3); cursor: not-allowed; }

/* Stop button — hidden by default, shown via .visible class */
.stop-btn {
  width: 34px; height: 34px; border-radius: 9px; border: none;
  background: var(--danger); color: #fff; cursor: pointer;
  display: none; /* toggled to flex via JS */
  align-items: center; justify-content: center; flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}
.stop-btn.visible { display: flex; }
.stop-btn:hover { filter: brightness(1.15); }
.stop-btn:active { transform: scale(0.93); }

/* ─── Sidebar ───────────────────────────────────────────── */
.drawer-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.55);
  backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
  z-index: 40; opacity: 0; pointer-events: none; transition: opacity var(--transition);
}
.drawer-overlay.active { opacity: 1; pointer-events: all; }

.settings-drawer {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: min(300px, 88vw); background: var(--surface);
  border-right: 1px solid var(--border-mid); z-index: 50;
  display: flex; flex-direction: column;
  transform: translateX(-100%); transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto; overscroll-behavior: contain;
}
.settings-drawer.open { transform: translateX(0); }
.settings-drawer::-webkit-scrollbar { width: 3px; }
.settings-drawer::-webkit-scrollbar-thumb { background: var(--surface-3); }

.drawer-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 16px 12px; border-bottom: 1px solid var(--border);
  flex-shrink: 0; position: sticky; top: 0; background: var(--surface); z-index: 1;
}
.drawer-title { font-size: 14px; font-weight: 600; color: var(--text); letter-spacing: 0.03em; text-transform: uppercase; }
.drawer-close {
  width: 30px; height: 30px; border: none; background: transparent;
  color: var(--text-3); cursor: pointer; display: flex; align-items: center;
  justify-content: center; border-radius: var(--radius-xs);
  transition: background var(--transition), color var(--transition);
}
.drawer-close:hover { background: var(--surface-2); color: var(--text); }

.drawer-section {
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 8px;
}
.drawer-section.session-list-section { flex: 1; min-height: 0; }

.drawer-actions-row { flex-direction: row; gap: 6px; }
.drawer-actions-row .action-btn { flex: 1; justify-content: center; }

.drawer-footer {
  padding: 12px 16px; border-top: 1px solid var(--border);
  flex-shrink: 0; position: sticky; bottom: 0; background: var(--surface);
}
.drawer-footer-btn {
  display: flex; align-items: center; gap: 8px; width: 100%; background: transparent;
  border: 1px solid var(--border-mid); color: var(--text-2); font-family: inherit;
  font-size: 13px; padding: 8px 12px; border-radius: var(--radius-sm); cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.drawer-footer-btn:hover { background: var(--surface-2); color: var(--text); }

/* Session items */
.session-list { display: flex; flex-direction: column; gap: 2px; overflow-y: auto; }
.session-empty { font-size: 12.5px; color: var(--text-3); text-align: center; padding: 16px 0; }

.session-item {
  display: flex; align-items: center; gap: 6px; padding: 8px 10px;
  border-radius: var(--radius-sm); cursor: pointer; border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
  animation: fadeUp 0.18s ease both;
}
.session-item:hover { background: var(--surface-2); }
.session-item.active {
  background: var(--accent-dim); border-color: rgba(118,185,0,0.2);
}
body.theme-midnight .session-item.active {
  background: rgba(99,153,255,0.1); border-color: rgba(99,153,255,0.2);
}
.session-info { flex: 1; min-width: 0; }
.session-title {
  font-size: 13px; color: var(--text); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; font-weight: 500;
}
.session-meta { font-size: 11px; color: var(--text-3); margin-top: 1px; }
.session-del {
  background: transparent; border: none; cursor: pointer; color: var(--text-3);
  padding: 3px; border-radius: var(--radius-xs); display: flex; align-items: center;
  flex-shrink: 0; transition: color var(--transition), background var(--transition);
  opacity: 0;
}
.session-item:hover .session-del { opacity: 1; }
.session-del:hover { color: var(--danger); background: var(--danger-dim); }

/* ─── Settings Modal ────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  z-index: 60; opacity: 0; pointer-events: none; transition: opacity var(--transition);
}
.modal-overlay.active { opacity: 1; pointer-events: all; }

.settings-modal {
  position: fixed; top: 50%; left: 50%;
  transform: translate(-50%, -48%) scale(0.97);
  width: min(520px, 94vw); max-height: 86vh;
  background: var(--surface); border: 1px solid var(--border-mid);
  border-radius: 18px; z-index: 70; display: flex; flex-direction: column;
  opacity: 0; pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  overflow: hidden;
}
.settings-modal.open {
  opacity: 1; pointer-events: all;
  transform: translate(-50%, -50%) scale(1);
}

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px 14px; border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-title { font-size: 15px; font-weight: 600; color: var(--text); }

.modal-body { overflow-y: auto; padding: 4px 0 12px; }
.modal-body::-webkit-scrollbar { width: 3px; }
.modal-body::-webkit-scrollbar-thumb { background: var(--surface-3); }

.modal-section {
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 10px;
}
.modal-section:last-child { border-bottom: none; }

/* Persona bar */
.persona-bar { display: flex; gap: 8px; align-items: center; }

/* Text inputs */
.text-input {
  background: var(--surface-2); border: 1px solid var(--border-mid);
  color: var(--text); font-family: inherit; font-size: 13.5px;
  padding: 9px 12px; border-radius: var(--radius-sm); outline: none; width: 100%;
  transition: border-color var(--transition);
}
.text-input:focus { border-color: rgba(118,185,0,0.5); }
body.theme-midnight .text-input:focus { border-color: rgba(99,153,255,0.5); }

#personaInput {
  background: var(--surface-2); border: 1px solid var(--border-mid); color: var(--text);
  font-family: inherit; font-size: 13px; line-height: 1.55; padding: 10px 12px;
  border-radius: var(--radius-sm); resize: vertical; outline: none; min-height: 90px;
  transition: border-color var(--transition); width: 100%;
}
#personaInput::placeholder { color: var(--text-3); }
#personaInput:focus { border-color: rgba(118,185,0,0.5); }
body.theme-midnight #personaInput:focus { border-color: rgba(99,153,255,0.5); }

/* Theme switcher */
.theme-switcher { display: flex; gap: 6px; flex-wrap: wrap; }
.theme-btn {
  padding: 7px 14px; font-size: 12.5px; font-family: inherit;
  background: var(--surface-2); border: 1px solid var(--border-mid);
  color: var(--text-2); border-radius: 20px; cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.theme-btn:hover { background: var(--surface-3); color: var(--text); }
.theme-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
body.theme-midnight .theme-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

/* ─── Shared components ─────────────────────────────────── */
.section-label {
  display: flex; align-items: center; gap: 6px; font-size: 11.5px;
  font-weight: 600; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em;
}
.section-hint { font-size: 11.5px; color: var(--text-3); line-height: 1.5; }

.select-wrapper { position: relative; }
.select-wrapper select {
  width: 100%; appearance: none; background: var(--surface-2);
  border: 1px solid var(--border-mid); color: var(--text); font-family: inherit;
  font-size: 13.5px; padding: 9px 32px 9px 12px; border-radius: var(--radius-sm);
  cursor: pointer; outline: none; transition: border-color var(--transition);
}
.select-wrapper select:focus { border-color: rgba(118,185,0,0.5); }
.select-chevron {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  pointer-events: none; color: var(--text-3);
}

.refresh-btn {
  display: flex; align-items: center; gap: 5px; background: transparent;
  border: 1px solid var(--border-mid); color: var(--text-3); font-family: inherit;
  font-size: 12px; padding: 6px 10px; border-radius: var(--radius-xs);
  cursor: pointer; align-self: flex-start;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.refresh-btn:hover { background: var(--surface-2); color: var(--text-2); }

.param-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.param-label { font-size: 13px; color: var(--text-2); flex-shrink: 0; min-width: 90px; }
.param-controls { display: flex; align-items: center; gap: 8px; flex: 1; }
.param-controls input[type="range"] {
  flex: 1; appearance: none; height: 4px; border-radius: 2px;
  background: var(--surface-3); outline: none; cursor: pointer;
}
.param-controls input[type="range"]::-webkit-slider-thumb {
  appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: none;
}
.param-value { font-size: 12px; font-family: var(--font-mono); color: var(--accent); min-width: 36px; text-align: right; }

.action-btn {
  display: flex; align-items: center; gap: 6px; background: transparent;
  border: 1px solid var(--border-mid); color: var(--text-2); font-family: inherit;
  font-size: 13px; padding: 8px 12px; border-radius: var(--radius-sm); cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.action-btn.danger:hover { background: var(--danger-dim); color: var(--danger); border-color: rgba(224,82,82,0.3); }
.action-btn.accent {
  border-color: rgba(118,185,0,0.3); color: var(--accent); background: var(--accent-dim);
}
.action-btn.accent:hover { background: rgba(118,185,0,0.2); border-color: rgba(118,185,0,0.5); }

/* ─── Toast ─────────────────────────────────────────────── */
.toast {
  position: fixed; bottom: calc(80px + var(--input-pb)); left: 50%;
  transform: translateX(-50%) translateY(10px); max-width: calc(100vw - 32px);
  background: var(--surface-2); border: 1px solid var(--border-mid);
  color: var(--text-2); font-size: 13px; padding: 8px 16px;
  border-radius: 20px; z-index: 200; opacity: 0;
  transition: opacity 0.2s, transform 0.2s; pointer-events: none;
}
.toast.error { background: #2a1616; border-color: rgba(224,82,82,0.3); color: #f08080; }
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ─── Animations ─────────────────────────────────────────── */
@keyframes fadeUp { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }
@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:0; } }
@keyframes pulse { 0%,100% { opacity:0.3; transform:scale(0.9); } 50% { opacity:1; transform:scale(1.1); } }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Desktop ───────────────────────────────────────────── */
@media (min-width: 640px) {
  .chat-container { padding: 28px 0 12px; }
  .messages-list { padding: 0 20px; }
  .input-area { padding: 10px 20px calc(10px + var(--input-pb)); }
  .app-header { padding: 0 18px; }
  .settings-drawer { width: 280px; }
}