:root {
  --bg: #f3f5f8;
  --bg-2: #ffffff;
  --text: #0f1720;
  --muted: #5a6472;
  --line: #d9dee5;
  --accent: #0f6bff;
  --accent-2: #1656bd;
  --ok: #0a8f46;
  --warn: #b46800;
  --danger: #c93030;
  --shadow: 0 12px 30px rgba(20, 32, 48, 0.1);
  --scrollbar-track: color-mix(in srgb, var(--bg) 85%, var(--bg-2));
  --scrollbar-thumb: color-mix(in srgb, var(--muted) 35%, transparent);
  --scrollbar-thumb-hover: color-mix(in srgb, var(--muted) 55%, transparent);
}

body.theme-dark {
  --bg: #11151b;
  --bg-2: #1a2029;
  --text: #f4f7fb;
  --muted: #a8b3c1;
  --line: #2e3744;
  --accent: #6da8ff;
  --accent-2: #4f8df0;
  --ok: #31c56d;
  --warn: #f2a43e;
  --danger: #ff6d6d;
  --shadow: 0 18px 36px rgba(0, 0, 0, 0.35);
  --scrollbar-track: color-mix(in srgb, var(--bg) 78%, var(--bg-2));
  --scrollbar-thumb: color-mix(in srgb, #b8c4d6 30%, transparent);
  --scrollbar-thumb-hover: color-mix(in srgb, #b8c4d6 50%, transparent);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: radial-gradient(circle at top left, #d6e4ff 0%, var(--bg) 35%, var(--bg) 100%);
  color: var(--text);
  font-family: "Segoe UI", "SF Pro Display", "Helvetica Neue", sans-serif;
  overflow: hidden;
}

.app-shell {
  display: grid;
  grid-template-columns: 270px 1fr 340px;
  height: 100vh;
  overflow: hidden;
}

.hidden {
  display: none !important;
}

.auth-gate {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card {
  width: min(420px, 100%);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--bg-2) 92%, var(--bg));
  box-shadow: var(--shadow);
}

.auth-eyebrow {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.auth-card h1 {
  margin: 0 0 10px;
  font-size: 28px;
}

.auth-copy {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.5;
}

.auth-input {
  width: 100%;
  margin-bottom: 14px;
  font-size: 16px;
}

.auth-submit {
  width: 100%;
}

.auth-message {
  min-height: 20px;
  margin-top: 12px;
  color: var(--danger);
  font-size: 14px;
}

.sidebar,
.main-panel,
.rules-panel {
  background: var(--bg-2);
  border-right: 1px solid var(--line);
}

.sidebar {
  padding: 20px;
}

.brand {
  font-size: 24px;
  font-weight: 650;
  letter-spacing: 0.3px;
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.version-badge {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.session-list {
  margin-top: 16px;
  display: grid;
  gap: 8px;
}

.session-item-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.session-item {
  flex: 1;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  text-align: left;
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
}

.session-item-input {
  cursor: text;
}

.session-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 40%, transparent);
}

.session-close-btn {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  line-height: 1;
  padding: 0;
  font-size: 16px;
}

.session-close-btn:hover {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--line));
  color: var(--danger);
}

.main-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
  overflow: hidden;
}

.topbar {
  border-bottom: 1px solid var(--line);
  padding: 14px 20px;
  display: grid;
  gap: 10px;
}

.controls-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.controls-row:first-child {
  justify-content: space-between;
}

.controls-row.small {
  justify-content: space-between;
}

.control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

select,
textarea,
input[type="text"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
}

.chat-view {
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  align-content: flex-start;
  gap: 12px;
}

.chat-view,
textarea,
.rules-panel {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.chat-view::-webkit-scrollbar,
textarea::-webkit-scrollbar,
.rules-panel::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.chat-view::-webkit-scrollbar-track,
textarea::-webkit-scrollbar-track,
.rules-panel::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 999px;
}

.chat-view::-webkit-scrollbar-thumb,
textarea::-webkit-scrollbar-thumb,
.rules-panel::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 999px;
}

.chat-view::-webkit-scrollbar-thumb:hover,
textarea::-webkit-scrollbar-thumb:hover,
.rules-panel::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

.msg {
  max-width: min(820px, 92%);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  white-space: pre-wrap;
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.msg.user {
  margin-left: auto;
  background: color-mix(in srgb, var(--accent) 14%, var(--bg-2));
}

.msg.assistant {
  margin-right: auto;
}

.generated-file-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.generated-file-link:hover {
  text-decoration: underline;
}

.msg-meta {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.msg p {
  margin: 0 0 8px;
}

.msg p:last-child {
  margin-bottom: 0;
}

.msg ul,
.msg ol {
  margin: 0 0 8px 20px;
}

.msg code {
  background: color-mix(in srgb, var(--bg) 82%, var(--line));
  border-radius: 6px;
  padding: 1px 5px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.msg pre {
  margin: 0 0 8px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.composer {
  border-top: 1px solid var(--line);
  padding: 14px 20px;
  display: grid;
  gap: 10px;
  position: relative;
}

.send-progress {
  height: 3px;
  width: 100%;
  background: color-mix(in srgb, var(--line) 65%, transparent);
  border-radius: 999px;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.send-progress.active {
  opacity: 1;
}

.send-progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.15s linear;
}

textarea {
  min-height: 84px;
  max-height: 220px;
  overflow-y: auto;
  resize: vertical;
}

.composer-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.file-upload {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.file-upload:hover {
  border-color: var(--accent);
}

.file-upload.drag-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.file-upload-icon {
  width: 16px;
  height: 16px;
  display: inline-flex;
}

.file-upload-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
}

.file-upload input {
  display: none;
}

.response-mode-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.response-mode-control select {
  min-width: 150px;
}

.attachment-info,
.rules-validation {
  color: var(--muted);
  font-size: 13px;
}

.btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  border-color: var(--line);
}

.btn-primary {
  border-color: var(--accent);
  background: linear-gradient(150deg, var(--accent), var(--accent-2));
  color: white;
}

.theme-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.theme-btn-icon {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-btn-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
}

.status-badge {
  font-size: 12px;
  color: var(--muted);
}

.switch-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.rules-panel {
  padding: 18px;
  overflow: auto;
}

.rules-panel.hidden {
  display: none;
}

.rules-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.rules-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.rules-copy {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.45;
}

.rules-editor-wrap {
  margin-bottom: 16px;
}

.rules-editor {
  width: 100%;
  min-height: 320px;
  max-height: 58vh;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, var(--bg-2));
  line-height: 1.5;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  resize: vertical;
}

.rules-editor:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent);
}

.rules-summary {
  margin-bottom: 16px;
}

.rules-summary-list {
  color: var(--muted);
  line-height: 1.45;
  display: grid;
  gap: 6px;
}

.rules-summary-item {
  padding-left: 12px;
  position: relative;
}

.rules-summary-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 55%, var(--muted));
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 240px 1fr;
  }

  .rules-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(92vw, 360px);
    z-index: 10;
    box-shadow: var(--shadow);
  }
}

@media (max-width: 880px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .controls-row:first-child {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .topbar-actions {
    width: 100%;
    justify-content: flex-end;
    margin-left: 0;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}