:root {
  color-scheme: dark;
  --stage: #171816;
  --panel: #ebe7dc;
  --panel-soft: #f7f4ec;
  --panel-muted: #ded9ca;
  --ink: #20211e;
  --muted: #747064;
  --line: #c5bead;
  --line-strong: #4b4b44;
  --red: #c54a50;
  --red-deep: #963941;
  --green: #4fab7c;
  --shadow: 0 18px 56px rgba(0, 0, 0, 0.24);
  --radius: 10px;
  --font: "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--stage);
  color: var(--panel);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.45;
  letter-spacing: 0;
}

button,
textarea,
input,
select {
  font: inherit;
}

button {
  transition: transform 120ms ease, background 140ms ease, color 140ms ease, border-color 140ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(1px);
}

.app {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 16px;
  height: 100vh;
  padding: 18px;
}

.sidebar,
.chat {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.sidebar {
  display: flex;
  flex-direction: column;
}

.chat {
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.brand,
.topbar,
.profile-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.brand strong,
.topbar strong,
.profile-card strong {
  font-size: 17px;
  font-weight: 720;
}

.brand span,
.topbar span,
.profile-card span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.brand::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(79, 171, 124, 0.14);
}

.brand button,
.ghost,
.composer button,
.profile-card button,
.icon-button,
.danger-button {
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: transparent;
  color: var(--ink);
  padding: 0 13px;
  cursor: pointer;
  font-weight: 650;
}

.brand button {
  width: 40px;
  padding: 0;
  background: var(--red);
  color: #fff7ef;
  font-size: 25px;
  line-height: 1;
}

.ghost:hover,
.profile-card button:hover,
.icon-button:hover {
  background: var(--ink);
  color: var(--panel);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.chat-list {
  display: grid;
  gap: 8px;
  padding: 12px;
  overflow: auto;
}

.chat-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 30px 30px;
  align-items: center;
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  padding: 10px;
  cursor: pointer;
  color: var(--ink);
}

.chat-item.active,
.chat-item:hover {
  background: var(--panel-soft);
  border-color: var(--line-strong);
}

.chat-item strong,
.chat-item span {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item strong {
  font-size: 16px;
  font-weight: 730;
}

.chat-item span {
  color: var(--muted);
  font-size: 12px;
}

.chat-item em,
.chat-item i {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--muted);
  font-style: normal;
  font-size: 16px;
}

.chat-item i:hover {
  border-color: var(--line-strong);
  background: var(--panel-muted);
  color: var(--ink);
}

.chat-item em {
  color: var(--red-deep);
  font-size: 20px;
}

.chat-item em:hover {
  border-color: var(--red-deep);
  background: #efd6d1;
}

.messages {
  overflow: auto;
  padding: 22px max(20px, 6vw);
  background: var(--panel-soft);
  background-size: 100% 56px;
}

.message {
  max-width: 860px;
  margin: 0 auto 18px;
  animation: rise 180ms ease-out;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.bubble {
  display: inline-block;
  max-width: 100%;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.user {
  text-align: right;
}

.user .bubble {
  background: #20211e;
  border-color: #20211e;
  color: var(--panel);
  text-align: left;
}

.assistant .bubble {
  background: #f8f5ec;
}

.message-meta {
  max-width: 100%;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font);
}

.assistant .message-meta {
  text-align: left;
}

.reasoning {
  margin-bottom: 8px;
  border: 1px solid #d8c5be;
  border-radius: 10px;
  background: #eee5df;
  color: #6f5b52;
  overflow: hidden;
}

.reasoning summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  padding: 9px 12px;
  font-size: 12px;
  font-weight: 650;
}

.reasoning summary b {
  color: var(--muted);
  font-weight: 600;
}

.reasoning pre {
  margin: 0;
  padding: 0 12px 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 16px max(20px, 6vw) 18px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}

.composer textarea {
  resize: none;
  max-height: 170px;
  min-height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: #f8f6ed;
  color: var(--ink);
  padding: 12px;
  outline: none;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.composer textarea:focus,
.dialog-box input:focus,
.dialog-box select:focus {
  outline: 2px solid var(--red);
  outline-offset: 1px;
}

.composer button,
.dialog-box button:not(.icon-button):not(.danger-button) {
  background: var(--red);
  border-color: var(--red-deep);
  color: #fff7ef;
}

.composer button::before {
  content: "> ";
}

dialog {
  border: 0;
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 0;
  background: var(--panel);
  color: var(--ink);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.58);
}

.dialog-box {
  width: min(430px, calc(100vw - 32px));
  padding: 20px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
}

#profilesDialog .dialog-box,
#editProfileDialog .dialog-box,
#filesDialog .dialog-box {
  width: min(620px, calc(100vw - 32px));
}

.dialog-box h1 {
  margin: 0 0 6px;
  font-size: 28px;
  line-height: 1.05;
}

.dialog-box h2 {
  margin: 0 0 10px;
  font-size: 17px;
}

.dialog-box p {
  margin: 0 0 16px;
  color: var(--muted);
  font-weight: 650;
}

.dialog-box label {
  display: grid;
  gap: 5px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.dialog-box input,
.dialog-box select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 10px 12px;
  background: #f8f6ed;
  color: var(--ink);
}

.dialog-box button:not(.icon-button):not(.danger-button) {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--red-deep);
  border-radius: 8px;
  margin-top: 4px;
  cursor: pointer;
  font-weight: 700;
}

.dialog-box .secondary-button {
  background: var(--panel-soft) !important;
  border-color: var(--line-strong) !important;
  color: var(--ink) !important;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 10px;
}

.danger-button {
  background: #f0d3ce;
  border-color: var(--red-deep);
  color: var(--red-deep);
}

.danger-button:hover {
  background: var(--red);
  color: #fff4ef;
}

.dialog-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.icon-button {
  width: 40px;
  padding: 0;
  font-size: 28px;
  line-height: 1;
}

.error {
  display: block;
  min-height: 20px;
  margin-top: 8px;
  color: var(--red-deep);
  font-size: 13px;
  font-weight: 700;
}

.users-list {
  display: grid;
  gap: 8px;
  margin: 12px 0 16px;
}

.user-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 11px 12px;
  background: var(--panel-soft);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.user-row:hover {
  background: #20211e;
  color: var(--panel);
}

.user-row span,
.user-row small {
  display: block;
  color: inherit;
  opacity: 0.68;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.create-profile {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.files-list {
  display: grid;
  gap: 8px;
  max-height: min(46vh, 430px);
  overflow: auto;
  margin: 14px 0 16px;
  padding-right: 2px;
}

.file-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 10px;
  background: var(--panel-soft);
}

.file-pick {
  display: flex !important;
  grid-template-columns: none !important;
  align-items: center;
  gap: 10px !important;
  min-width: 0;
  margin: 0 !important;
  text-transform: none !important;
}

.file-pick input {
  width: 18px;
  min-height: 18px;
  flex: 0 0 18px;
}

.file-pick span {
  min-width: 0;
}

.file-pick strong,
.file-pick small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-pick strong {
  color: var(--ink);
  font-size: 14px;
}

.file-pick small,
.empty-files {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.empty-files {
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}

.file-actions {
  display: flex;
  gap: 6px;
}

.file-actions .ghost,
.file-actions .danger-button {
  width: auto !important;
  min-height: 34px !important;
  margin: 0 !important;
  padding: 0 10px;
  border-radius: 7px;
}

@media (max-width: 860px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
    gap: 10px;
    height: 100dvh;
    padding: 10px;
  }

  .sidebar {
    max-height: none;
  }

  .brand,
  .profile-card {
    padding: 10px 12px;
  }

  .chat-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 10px;
  }

  .chat-item {
    min-width: 230px;
  }

  .chat {
    min-height: 0;
  }

  .topbar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 12px;
  }

  .messages,
  .composer {
    padding-left: 12px;
    padding-right: 12px;
  }

  .composer,
  .dialog-actions {
    grid-template-columns: 1fr;
  }

  .file-row {
    grid-template-columns: 1fr;
  }

  .file-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .top-actions {
    justify-content: flex-start;
  }

  .ghost {
    min-height: 34px;
    padding: 0 10px;
  }
}