:root {
  --bg: #0B0E11;
  --bg-elevated: #12161B;
  --bg-elevated-hover: #171C22;
  --bg-inset: #06080A;
  --border: #1E242B;
  --border-bright: #2A323B;
  --text: #E8ECEF;
  --text-muted: #9AA5B1;
  --text-dim: #5C6670;
  --accent: #7CF5C4;
  --accent-dim: #4FCBA0;
  --accent-bg: rgba(124, 245, 196, 0.08);
  --error: #F0776C;
  --error-bg: rgba(240, 119, 108, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-body: 'Inter', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
  flex-shrink: 0;
  animation: pulse-dot 2.4s ease-in-out infinite;
}

.brand-dot--lg {
  width: 16px;
  height: 16px;
  box-shadow: 0 0 0 6px var(--accent-bg);
  margin-bottom: 8px;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 3px var(--accent-bg); }
  50% { box-shadow: 0 0 0 7px var(--accent-bg); }
}

/* ============================================================
   Login required
   ============================================================ */

.login-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-required-card {
  width: 340px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
}

.login-required-card h2 {
  font-family: var(--font-display);
  margin: 14px 0 8px;
}

.login-required-card p {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 22px;
}

.console-link-btn {
  display: inline-block;
  background: var(--accent);
  color: #06110D;
  border-radius: var(--radius-sm);
  padding: 10px 22px;
  font-weight: 600;
  text-decoration: none;
  font-size: 14px;
}

/* ============================================================
   App layout
   ============================================================ */

.app {
  display: flex;
  height: 100vh;
  position: relative;
}

.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 60;
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
}

.sidebar {
  width: 272px;
  flex-shrink: 0;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.2s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 4px;
}

.sidebar-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13.5px;
  transition: background 0.15s ease;
}
.new-chat-btn:hover { background: rgba(124, 245, 196, 0.14); }

.sidebar-search input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 13px;
  padding: 8px 10px;
}
.sidebar-search input:focus {
  outline: none;
  border-color: var(--accent-dim);
}

.conversation-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conversation-group-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 12px 8px 4px;
}
.conversation-group-label:first-child { padding-top: 4px; }

.conversation-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 8px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  color: var(--text-muted);
  cursor: pointer;
}

.conversation-item:hover,
.conversation-item.is-active {
  background: var(--bg-elevated-hover);
  color: var(--text);
}

.conversation-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-title input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  color: var(--text);
  font-size: 13px;
  padding: 2px 6px;
}

.conversation-actions {
  display: none;
  gap: 2px;
}
.conversation-item:hover .conversation-actions { display: flex; }

.conversation-actions button {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 12px;
  padding: 3px 5px;
  border-radius: 4px;
}
.conversation-actions button:hover {
  color: var(--text);
  background: var(--bg);
}

.sidebar-scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 40;
}

/* ============================================================
   Main / messages
   ============================================================ */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  min-width: 0;
}

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

.empty-state h2 {
  font-family: var(--font-display);
  margin: 0 0 6px;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.message-row {
  display: flex;
  gap: 10px;
  max-width: 760px;
}

.message-row.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message-row.assistant {
  align-self: flex-start;
}

.message-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.message-row.assistant .message-avatar {
  background: var(--accent-bg);
  border: 1px solid var(--accent-dim);
}
.message-row.assistant .message-avatar::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.message-row.user .message-avatar { visibility: hidden; }

.message-bubble {
  line-height: 1.65;
  font-size: 14.5px;
}

.message-row.user .message-bubble {
  background: var(--accent-bg);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius-md) var(--radius-md) 4px var(--radius-md);
  padding: 10px 14px;
  white-space: pre-wrap;
}

.message-row.assistant .message-bubble {
  color: var(--text);
  padding-top: 2px;
}

.message-bubble p:first-child { margin-top: 0; }
.message-bubble p:last-child { margin-bottom: 0; }
.message-bubble ul, .message-bubble ol { padding-left: 20px; }
.message-bubble a { color: var(--accent); }

.message-bubble code {
  font-family: var(--font-mono);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

.message-bubble pre {
  background: var(--bg-inset);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  overflow-x: auto;
  position: relative;
}
.message-bubble pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
}

.stream-cursor {
  display: inline-block;
  width: 7px;
  height: 15px;
  background: var(--accent);
  animation: blink 1.1s step-end infinite;
  margin-left: 2px;
  vertical-align: text-bottom;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Tool call card — signature element ── */

.tool-card {
  align-self: flex-start;
  max-width: 480px;
  width: 100%;
  background: var(--bg-inset);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-family: var(--font-mono);
}

.tool-card-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  background: #0E1218;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.tool-card-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
}
.tool-card.is-running .tool-card-dot {
  background: var(--accent);
  animation: pulse-dot 1s ease-in-out infinite;
}
.tool-card.is-error .tool-card-dot { background: var(--error); }

.tool-card-name {
  flex: 1;
  font-size: 12px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tool-card-status {
  font-size: 10.5px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tool-card-chevron {
  font-size: 10px;
  color: var(--text-dim);
  transition: transform 0.15s ease;
}
.tool-card.is-expanded .tool-card-chevron { transform: rotate(180deg); }

.tool-card-body {
  display: none;
  padding: 12px;
  font-size: 12px;
}
.tool-card.is-expanded .tool-card-body { display: block; }

.tool-card-section-label {
  color: var(--text-dim);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.tool-card-section-label:not(:first-child) { margin-top: 10px; }

.tool-card-content {
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
}

/* ============================================================
   Composer
   ============================================================ */

.scroll-bottom-btn {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.composer {
  border-top: 1px solid var(--border);
  padding: 14px 24px 18px;
}

.attachment-preview {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.attachment-chip {
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 8px;
}

.attachment-chip button {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  padding: 0;
}
.attachment-chip button:hover { color: var(--error); }

.composer-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 8px 8px 8px 12px;
  max-width: 760px;
  margin: 0 auto;
  transition: border-color 0.15s ease;
}
.composer-row:focus-within { border-color: var(--accent-dim); }

.composer-icon-btn {
  background: none;
  border: none;
  font-size: 17px;
  cursor: pointer;
  padding: 6px;
  flex-shrink: 0;
  opacity: 0.75;
}
.composer-icon-btn:hover { opacity: 1; }

#message-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14.5px;
  resize: none;
  outline: none;
  max-height: 200px;
  padding: 7px 0;
}
#message-input::placeholder { color: var(--text-dim); }

.send-btn {
  background: var(--accent);
  color: #06110D;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: opacity 0.15s ease;
}
.send-btn:disabled { opacity: 0.35; cursor: default; }

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 780px) {
  .sidebar-toggle { display: flex; align-items: center; justify-content: center; }

  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
  }
  .sidebar.is-open { transform: translateX(0); }

  .sidebar-scrim.is-visible { display: block; }

  .messages { padding: 60px 16px 20px; }
  .composer { padding: 12px 12px 16px; }
  .message-row { max-width: 92%; }
}

.composer-icon-btn svg,
.send-btn svg {
  display: block;
}


.typing-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 0;
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-dim);
  animation: typing-bounce 1.2s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}


.model-select {
  background: var(--bg);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 12px;
  font-family: var(--font-mono);
  padding: 6px 8px;
  max-width: 160px;
  flex-shrink: 0;
  cursor: pointer;
}
.model-select:focus { outline: none; border-color: var(--accent-dim); }


.message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.message-attachment-chip {
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius-sm);
  padding: 4px 9px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text);
}

.drop-zone {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  border: 2px dashed var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
  pointer-events: none;
}
.drop-zone-inner {
  font-size: 15px;
  color: var(--text);
  background: var(--bg-elevated);
  padding: 20px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-bright);
}

.stop-btn {
  background: var(--error, #e5484d);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stopped-tag {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}


.message-row.user .message-bubble { position: relative; padding-right: 30px; }

.message-edit-btn {
  position: absolute;
  top: 6px;
  right: 8px;
  display: none;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  padding: 2px;
}
.message-row.user.is-editable:hover .message-edit-btn { display: block; }
.message-edit-btn:hover { color: var(--text); }

.message-edit-textarea {
  width: 100%;
  min-width: 240px;
  background: var(--bg-inset);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 8px 10px;
  resize: vertical;
  min-height: 60px;
}
.message-edit-controls {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  justify-content: flex-end;
}
.message-edit-save {
  background: var(--accent);
  color: #06110D;
  border: none;
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  font-size: 12.5px;
  cursor: pointer;
}
.message-edit-cancel {
  background: none;
  border: 1px solid var(--border-bright);
  color: var(--text-dim);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  font-size: 12.5px;
  cursor: pointer;
}


/* ── Tool card: grafický loading ── */
.tool-card-head { position: relative; }

.tool-card-spinner {
  width: 13px; height: 13px; flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--border-bright);
  border-top-color: var(--accent);
  animation: tool-spin 0.7s linear infinite;
}
.tool-card.is-done .tool-card-spinner,
.tool-card.is-error .tool-card-spinner {
  border: none; animation: none; position: relative;
}
.tool-card.is-done .tool-card-spinner { background: var(--accent); }
.tool-card.is-done .tool-card-spinner::after {
  content: ''; position: absolute; left: 4px; top: 1px;
  width: 3px; height: 6px;
  border: solid #06110D; border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.tool-card.is-error .tool-card-spinner { background: var(--error); }
.tool-card.is-error .tool-card-spinner::after {
  content: '×'; position: absolute; inset: 0;
  color: #2a0d0b; font-size: 12px; line-height: 13px;
  text-align: center; font-weight: 700;
}
@keyframes tool-spin { to { transform: rotate(360deg); } }

.tool-card-timer {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--text-dim);
}

.tool-card-progress {
  position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%;
  overflow: hidden; pointer-events: none;
}
.tool-card:not(.is-running) .tool-card-progress { display: none; }
.tool-card.is-running .tool-card-progress::before {
  content: ''; position: absolute; height: 100%; width: 40%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: tool-progress 1.1s ease-in-out infinite;
}
@keyframes tool-progress {
  0%   { left: -40%; }
  100% { left: 100%; }
}

/* ── Code bloky: hlavička + Copy ── */
.message-bubble .code-block {
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 10px 0;
}
.code-block .code-header {
  display: flex; align-items: center; justify-content: space-between;
  background: #0E1218;
  border-bottom: 1px solid var(--border);
  padding: 5px 10px;
  font-family: var(--font-mono); font-size: 11px;
}
.code-block .code-lang {
  color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em;
}
.code-block .code-copy-btn {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; font-family: var(--font-mono); font-size: 11px;
  padding: 2px 6px; border-radius: 4px;
}
.code-block .code-copy-btn:hover { color: var(--text); background: var(--bg-elevated); }
.code-block pre { margin: 0; border: none; border-radius: 0; }

/* ── Akce pod odpovědí (copy / regenerate) ── */
.msg-actions {
  display: flex; gap: 4px; margin-top: 8px;
  opacity: 0; transition: opacity 0.12s ease;
}
.message-row.assistant:hover .msg-actions,
.message-row.assistant.is-last .msg-actions { opacity: 1; }
.msg-action {
  background: none; border: 1px solid transparent;
  color: var(--text-dim); cursor: pointer;
  padding: 4px; border-radius: 6px; line-height: 0;
  display: inline-flex;
}
.msg-action:hover {
  color: var(--text); background: var(--bg-elevated); border-color: var(--border);
}
.msg-action svg { width: 15px; height: 15px; display: block; }
.message-row.assistant:not(.is-last) .msg-action-regen { display: none; }

.brand-logo {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: block;
}

.brand-logo--lg {
  width: 44px;
  height: 44px;
  margin-bottom: 10px;
}

.app-link {
  margin-top: auto;             
  padding: 12px 4px 4px;
  font-size: 13px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  transition: color 0.15s;
}
.app-link:hover {
  color: var(--text);
  text-decoration: none;
}