:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f5f5f5;
  --color-surface: #ffffff;
  --color-accent: #161f23;
  --color-accent-soft: rgba(22, 31, 35, 0.12);
  --color-text: #161f23;
  --color-muted: #7a8389;
  --color-border-soft: #e2e5e7;
  --color-border-subtle: #f3f4f5;
  --color-error: #c62828;

  --fs-xs: 11px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-lg: 18px;
  --fs-xl: 24px;

  --lh-tight: 1.3;
  --lh-normal: 1.5;

  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 25px;
  --transition-fast: 0.15s ease-out;

  --page-padding: 0px;
  --shell-max-width: 1120px;
  --chat-max-width: 980px;
  --chat-max-height: 95vh;
  --admin-max-width: 1240px;
  --admin-max-height: 95vh;

  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
}

/* Общий контейнер страниц */

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--page-padding);
  background: var(--color-bg-soft);
}

.page--login,
.page--chat {
  background: var(--color-bg);
}

/* Логин */

.auth-card {
  width: 100%;
  max-width: 440px;
  padding: 40px 32px 32px;
  margin: 0;
  background: var(--color-surface);
}

.auth-logo {
  display: flex;
  justify-content: center;
  margin-bottom: 32px;
}

.auth-logo img {
  width: 100%;
  max-width: 360px;
}

.auth-title {
  text-align: center;
  margin: 0 0 24px;
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
}

.auth-label {
  font-size: var(--fs-sm);
  margin-bottom: 6px;
  display: block;
}

.auth-input-wrapper {
  position: relative;
  margin-bottom: 14px;
}

.auth-input-prefix {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  font-size: var(--fs-sm);
}

.auth-input {
  width: 100%;
  padding: 11px 14px;
  padding-left: 32px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-soft);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
}

.auth-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-soft);
}

.auth-input--readonly {
  opacity: 0.7;
}

.auth-button {
  position: relative;
  overflow: hidden;
  width: 100%;
  padding: 11px 18px;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--color-accent);
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
  margin-top: 4px;
  font-size: var(--fs-sm);
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.auth-button:hover:not(:disabled) {
  background: #1f2a30;
  box-shadow: 0 0 0 1px var(--color-accent-soft);
  transform: translateY(-0.5px);
}

.auth-button:disabled {
  opacity: 0.6;
  cursor: default;
}

.auth-error {
  margin-top: 8px;
  font-size: var(--fs-sm);
  color: var(--color-error);
}

.auth-hint {
  margin-top: 10px;
  font-size: var(--fs-sm);
  color: var(--color-muted);
}

.auth-hint a {
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}

.auth-hint a:hover {
  text-decoration: underline;
}

/* Утилиты */

.hidden {
  display: none;
}

/* Чат */

.chat-shell {
  width: 100%;
  max-width: var(--chat-max-width);
  height: 100vh;
  max-height: var(--chat-max-height);
  margin: 0;
  border-radius: 32px;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
}

.chat-header-left {
  display: flex;
  align-items: center;
}

.chat-logo {
  height: 32px;
  margin-right: 8px;
}

.chat-messages {
  flex: 1;
  padding: 20px 24px;
  overflow-y: auto;
}

.chat-message {
  display: flex;
  margin-bottom: 12px;
}

.chat-message--user {
  justify-content: flex-end;
}

.chat-message--bot {
  justify-content: flex-start;
}

.chat-bubble {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  white-space: pre-line;
}

.chat-message--user .chat-bubble {
  background: var(--color-accent);
  color: #ffffff;
  border-bottom-right-radius: 6px;
}

.chat-message--bot .chat-bubble {
  background: var(--color-bg-soft);
  border-radius: 18px;
  border-bottom-left-radius: 6px;
}

.chat-input-bar {
  display: flex;
  align-items: flex-end;
  padding: 14px 16px 18px;
  gap: 10px;
}

.chat-input {
  flex: 1;
  resize: none;
  max-height: 35vh;
  min-height: 40px;
  padding: 14px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-soft);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
}

.chat-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-soft);
}

.chat-messages,
.chat-input {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-soft) transparent;
}

.chat-messages::-webkit-scrollbar,
.chat-input::-webkit-scrollbar {
  width: 3px;
}

.chat-messages::-webkit-scrollbar-track,
.chat-input::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb,
.chat-input::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.18);
  border-radius: 999px;
}

.chat-input {
  overflow-y: auto;
  border-radius: var(--radius-pill);
}

/* Скрываем скроллбар */

.chat-input {
  scrollbar-width: none;
}

.chat-input::-webkit-scrollbar {
  display: none;
}

.chat-messages {
  overflow-y: auto;
}

.chat-send-btn {
  position: relative;
  overflow: hidden;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--color-accent);
  color: #ffffff;
  cursor: pointer;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.chat-send-btn:hover:not(:disabled) {
  background: #1f2a30;
  box-shadow: 0 0 0 1px var(--color-accent-soft);
  transform: translateY(-0.5px);
}

.auth-button::after,
.chat-send-btn::after,
.admin-button::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      120deg,
      transparent 0%,
      rgba(255, 255, 255, 0.4) 15%,
      rgba(255, 255, 255, 0) 30%
    )
    center/250% 250% no-repeat;
  mix-blend-mode: screen;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

@keyframes sheen {
  0% {
    background-position: -120% 50%;
  }
  100% {
    background-position: 220% 50%;
  }
}

.auth-button:hover::after,
.chat-send-btn:hover::after,
.admin-button:hover::after {
  opacity: 0.7;
  animation: sheen 1.8s cubic-bezier(0.25, 0.1, 0.25, 1) 1;
}

/* Админ-панель */

.page--admin {
  background: var(--color-bg-soft);
}

.admin-shell {
  width: 100%;
  max-width: var(--admin-max-width);
  max-height: var(--admin-max-height);
  margin: 0;
  border-radius: 28px;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.admin-header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.admin-header-title-main {
  font-size: var(--fs-base);
  font-weight: 600;
}

.admin-header-title-sub {
  font-size: var(--fs-sm);
  color: var(--color-muted);
}

.admin-header-right {
  font-size: var(--fs-sm);
}

.admin-header-link {
  color: var(--color-accent);
  text-decoration: none;
}

.admin-header-link:hover {
  text-decoration: underline;
}

.admin-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

.admin-column {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.admin-column--messages {
  border-right: 1px solid var(--color-border-subtle);
}

.admin-column--chunks {
  border-left: 1px solid var(--color-border-subtle);
}

.admin-section-header {
  padding: 14px 20px 10px;
}

.admin-section-title {
  margin: 0 0 4px;
  font-size: var(--fs-sm);
  font-weight: 600;
}

.admin-section-caption {
  font-size: var(--fs-xs);
  color: var(--color-muted);
}

.admin-subsection-header {
  padding: 10px 20px 0;
}

.admin-subsection-title {
  margin: 0 0 4px;
  font-size: var(--fs-sm);
  font-weight: 600;
}

.admin-messages {
  flex: 1;
  overflow-y: auto;
  padding: 8px 16px 12px;
}

.admin-message {
  padding: 12px 6px 14px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.admin-message-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
  font-size: var(--fs-xs);
}

.admin-message-user {
  font-weight: 500;
}

.admin-message-date {
  color: var(--color-muted);
  font-size: var(--fs-xs);
}

.admin-message-dialog {
  margin-bottom: 8px;
}

.admin-message-rating {
  border-radius: var(--radius-md);
  background: var(--color-bg-soft);
  padding: 8px;
}

.admin-rating-form {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: flex-start;
}

.admin-rating-stars {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.admin-rating-star {
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-soft);
  background: var(--color-surface);
  padding: 2px 10px;
  font-size: var(--fs-xs);
  cursor: pointer;
}

.admin-rating-star--active {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.admin-rating-comment {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
  padding: 6px 8px;
  font-size: var(--fs-xs);
  resize: vertical;
  min-height: 40px;
  max-height: 120px;
  outline: none;
}

.admin-rating-comment:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-soft);
}

.admin-rating-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.admin-ratings-list {
  margin-top: 8px;
  border-top: 1px dashed var(--color-border-soft);
  padding-top: 6px;
}

.admin-rating-item {
  padding: 4px 0;
  border-bottom: 1px dashed var(--color-border-subtle);
}

.admin-rating-item:last-child {
  border-bottom: none;
}

.admin-rating-item-top {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: var(--fs-xs);
}

.admin-rating-score {
  font-weight: 600;
}

.admin-rating-author {
  color: var(--color-muted);
}

.admin-rating-date {
  margin-left: auto;
  color: var(--color-muted);
}

.admin-rating-item-actions {
  display: flex;
  gap: 4px;
  margin-left: 8px;
}

.admin-rating-item-actions button {
  border: none;
  background: none;
  padding: 0;
  font-size: var(--fs-xs);
  color: var(--color-accent);
  cursor: pointer;
}

.admin-rating-item-actions button:hover {
  text-decoration: underline;
}

.admin-rating-comment-text {
  font-size: var(--fs-xs);
  margin-top: 2px;
}

.admin-empty,
.admin-empty-rating {
  font-size: var(--fs-xs);
  color: var(--color-muted);
}

/* Чанки */

.chunk-form {
  padding: 10px 20px 12px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.chunk-form-row {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
}

.chunk-label {
  display: flex;
  flex-direction: column;
  font-size: var(--fs-xs);
  gap: 2px;
}

.chunk-label--grow {
  flex: 1;
}

.chunk-input {
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-soft);
  padding: 7px 9px;
  font-size: var(--fs-sm);
  outline: none;
}

.chunk-input--textarea {
  border-radius: var(--radius-md);
  resize: vertical;
}

.chunk-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent-soft);
}

.chunk-meta-details {
  margin-top: 8px;
  font-size: var(--fs-xs);
}

.chunk-meta-details summary {
  cursor: pointer;
  list-style: none;
}

.chunk-meta-details summary::-webkit-details-marker {
  display: none;
}

.chunk-meta-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 10px;
}

.chunk-form-actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
}

.chunks-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 20px 12px;
}

.chunk-row {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: var(--fs-xs);
}

.chunk-row-header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 2px;
}

.chunk-row-title {
  font-weight: 500;
}

.chunk-row-type {
  color: var(--color-muted);
}

.chunk-row-meta-line {
  color: var(--color-muted);
  margin-bottom: 2px;
}

.chunk-row-stats {
  display: flex;
  gap: 8px;
  font-size: var(--fs-xs);
  color: var(--color-muted);
}

/* Общие кнопки и пагинация */

.admin-button {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--color-accent);
  color: #ffffff;
  padding: 7px 14px;
  font-size: var(--fs-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.admin-button--ghost {
  background: var(--color-surface);
  color: var(--color-accent);
  border: 1px solid var(--color-border-soft);
}

.admin-button--small {
  padding: 4px 10px;
  font-size: var(--fs-xs);
}

.admin-button:disabled {
  opacity: 0.5;
  cursor: default;
}

.admin-button:hover:not(:disabled) {
  background: #1f2a30;
  box-shadow: 0 0 0 1px var(--color-accent-soft);
  transform: translateY(-0.5px);
}

.admin-pagination {
  padding: 8px 20px 12px;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.admin-pagination-label {
  font-size: var(--fs-xs);
  color: var(--color-muted);
}

/* Toasts */

.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  min-width: 220px;
  max-width: 320px;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  background: #1a2227;
  color: #ffffff;
  font-size: var(--fs-sm);
  opacity: 0;
  transform: translateX(10px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
  pointer-events: auto;
}

.toast--visible {
  opacity: 1;
  transform: translateX(0);
}

.toast--hiding {
  opacity: 0;
  transform: translateX(10px);
}

.toast--error {
  background: var(--color-error);
}

/* ===== Адаптив ===== */
/* Крупные экраны → планшеты */

@media (max-width: 1200px) {
  :root {
    --page-padding: 32px;
    --chat-max-width: 900px;
    --admin-max-width: 1120px;
  }

  .admin-shell {
    border-radius: 24px;
  }

  .chat-shell {
    border-radius: 28px;
  }
}

/* Планшеты */

@media (max-width: 900px) {
  :root {
    --page-padding: 24px;
    --fs-base: 14px;
    --fs-lg: 17px;
    --fs-xl: 21px;
  }

  .page {
    align-items: stretch;
  }

  .auth-card {
    max-width: 420px;
    margin: auto;
    padding: 32px 24px 28px;
  }

  .chat-shell {
    max-height: none;
    height: calc(100vh - 2 * var(--page-padding));
  }

  .admin-body {
    flex-direction: column;
  }

  .admin-column--messages,
  .admin-column--chunks {
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--color-border-subtle);
  }

  .admin-column--messages {
    border-top: none;
  }
}

/* Мобильные */

@media (max-width: 600px) {
  :root {
    --page-padding: 16px;
    --fs-base: 14px;
    --fs-sm: 12px;
    --fs-lg: 16px;
    --fs-xl: 20px;
  }

  .page {
    padding: 0;
  }

  .auth-card {
    max-width: none;
    border-radius: 0;
    padding: 32px 20px 24px;
  }

  .chat-shell {
    max-width: none;
    max-height: none;
    height: 100vh;
    border-radius: 0;
  }

  .chat-header {
    padding: 12px 16px;
  }

  .chat-messages {
    padding: 16px;
  }

  .chat-input-bar {
    padding: 10px 12px 14px;
  }

  .admin-shell {
    max-width: none;
    max-height: none;
    border-radius: 0;
  }

  .admin-header {
    padding: 14px 16px;
  }
}