:root {
      color-scheme: light;
      --bg-main: #f4f7ff;
      --bg-banner: #ffffffd9;
      --bg-panel: #ffffff;
      --bg-input: #f2f5ff;
      --text-main: #16243d;
      --text-muted: #49607f;
      --line-soft: #d2dceb;
      --accent: #1e66d0;
      --accent-strong: #0d3f86;
      --bubble-assistant: #eef4ff;
      --bubble-user: #d7ebff;
      --bubble-assistant-question: #f4f8ff;
      --bubble-user-answer: #d7f6df;
      --bubble-system: #eff2f8;
      --bubble-error: #ffe3e0;
      --shadow-card: 0 20px 36px rgba(24, 47, 90, 0.12);
      --status-bg: #eef3ff;
      --status-border: #b7c7e5;
      --status-text: #204573;
    }

    body[data-theme="dark"] {
      color-scheme: dark;
      --bg-main: #0f1523;
      --bg-banner: #151f33d6;
      --bg-panel: #172137;
      --bg-input: #1f2a44;
      --text-main: #e8eefc;
      --text-muted: #a6b5d6;
      --line-soft: #2d3c58;
      --accent: #7aaeff;
      --accent-strong: #b5d0ff;
      --bubble-assistant: #24324d;
      --bubble-user: #2f4468;
      --bubble-assistant-question: #314769;
      --bubble-user-answer: #255541;
      --bubble-system: #27324a;
      --bubble-error: #4b2a31;
      --shadow-card: 0 24px 42px rgba(0, 0, 0, 0.4);
      --status-bg: #21314f;
      --status-border: #4e6a9a;
      --status-text: #c4dcff;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background:
        radial-gradient(circle at 8% 8%, color-mix(in oklab, var(--accent) 16%, transparent), transparent 34%),
        radial-gradient(circle at 92% 0%, color-mix(in oklab, var(--accent-strong) 14%, transparent), transparent 42%),
        var(--bg-main);
    }

    .shell {
      max-width: 1040px;
      margin: 0 auto;
      padding: 18px 14px 20px;
      display: grid;
      gap: 12px;
      min-height: 100vh;
    }

    .banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      height: 50px;
      border: 1px solid var(--line-soft);
      border-radius: 16px;
      background: var(--bg-banner);
      padding: 0 14px;
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(6px);
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      min-width: 0;
    }

    .brand-logo {
      width: 30px;
      height: 30px;
      display: block;
      flex: 0 0 auto;
    }

    .brand-title {
      margin: 0;
      font-family: "Space Grotesk", "Source Sans 3", sans-serif;
      font-size: 1.2rem;
      font-weight: 700;
      letter-spacing: 0.01em;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .status-wrap {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-left: auto;
    }

    .status-pill {
      border: 1px solid var(--status-border);
      border-radius: 999px;
      background: var(--status-bg);
      color: var(--status-text);
      padding: 4px 11px;
      font-size: 0.88rem;
      font-weight: 600;
      text-transform: lowercase;
      letter-spacing: 0.02em;
    }

    .message-pill {
      text-transform: none;
    }

    .time-pill {
      text-transform: none;
      font-variant-numeric: tabular-nums;
    }

    .icon-btn {
      border: 1px solid var(--line-soft);
      background: var(--bg-panel);
      color: var(--text-main);
      border-radius: 999px;
      width: 36px;
      height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .token-refresh-btn {
      position: relative;
      overflow: hidden;
    }

    .token-refresh-icon {
      position: absolute;
      transition: opacity 0.2s ease, transform 0.2s ease;
      pointer-events: none;
    }

    .token-refresh-primary {
      opacity: 0.78;
      transform: translateY(0) scale(1);
    }

    .token-refresh-secondary {
      opacity: 0.36;
      transform: translateY(0) scale(0.84);
    }

    .token-refresh-btn:disabled {
      opacity: 0.55;
      cursor: not-allowed;
    }

    .token-refresh-btn.is-refreshing .token-refresh-primary {
      animation: token-refresh-cw 0.85s linear infinite;
      opacity: 1;
    }

    .token-refresh-btn.is-refreshing .token-refresh-secondary {
      animation: token-refresh-ccw 0.95s linear infinite;
      opacity: 0.74;
    }

    @keyframes token-refresh-cw {
      from { transform: rotate(0deg) scale(1); }
      to { transform: rotate(360deg) scale(1); }
    }

    @keyframes token-refresh-ccw {
      from { transform: rotate(0deg) scale(0.84); }
      to { transform: rotate(-360deg) scale(0.84); }
    }

    .conversation {
      border: 1px solid var(--line-soft);
      border-radius: 18px;
      background: var(--bg-panel);
      box-shadow: var(--shadow-card);
      display: grid;
      grid-template-rows: auto 1fr auto;
      min-height: 0;
      overflow: hidden;
    }

    .conversation-meta {
      border-bottom: 1px solid var(--line-soft);
      padding: 10px 14px;
      color: var(--text-muted);
      font-size: 0.93rem;
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    .messages {
      padding: 14px;
      overflow-y: auto;
      overflow-x: hidden;
      scrollbar-gutter: stable;
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-height: 0;
      max-height: calc(100vh - 250px);
    }

    .bubble {
      max-width: min(80%, 720px);
      border: 1px solid var(--line-soft);
      border-radius: 14px;
      padding: 10px 12px;
      line-height: 1.35;
      white-space: pre-wrap;
      overflow-wrap: anywhere;
      word-break: break-word;
    }

    .bubble.assistant {
      align-self: flex-start;
      background: var(--bubble-assistant);
      border-top-left-radius: 5px;
    }

    .bubble.assistant.input-question {
      background: var(--bubble-assistant-question);
    }

    .bubble.from-user {
      align-self: flex-end;
      margin-right: 8px;
      background: var(--bubble-user);
      border-top-right-radius: 5px;
    }

    .bubble.from-user.input-answer {
      background: var(--bubble-user-answer);
      border-color: color-mix(in oklab, var(--bubble-user-answer) 62%, var(--line-soft));
    }

    .bubble.system {
      align-self: center;
      max-width: 92%;
      background: var(--bubble-system);
      color: var(--text-muted);
      font-size: 0.92rem;
    }

    .bubble.error {
      align-self: center;
      max-width: 92%;
      background: var(--bubble-error);
      color: color-mix(in oklab, #b83228 68%, var(--text-main));
    }

    .bubble.markdown p {
      margin: 0 0 10px;
    }

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

    .bubble.markdown pre {
      margin: 8px 0 0;
      border-radius: 10px;
      overflow: auto;
      border: 1px solid var(--line-soft);
      padding: 9px;
      background: color-mix(in oklab, var(--bg-input) 78%, var(--bg-panel));
    }

    .bubble.markdown code {
      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
      font-size: 0.92em;
      background: color-mix(in oklab, var(--bg-input) 60%, transparent);
      border-radius: 6px;
      padding: 1px 4px;
    }

    .bubble.markdown pre code {
      background: transparent;
      padding: 0;
      border-radius: 0;
    }

    .composer {
      border-top: 1px solid var(--line-soft);
      padding: 12px;
      display: grid;
      gap: 8px;
    }

    .composer-row {
      display: flex;
      gap: 8px;
      align-items: flex-end;
    }

    .composer-input {
      flex: 1 1 auto;
      min-height: 88px;
      resize: vertical;
      border: 1px solid var(--line-soft);
      border-radius: 12px;
      padding: 9px 10px;
      font: inherit;
      background: var(--bg-input);
      color: var(--text-main);
      outline: none;
    }

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

    .btn {
      border: 1px solid transparent;
      border-radius: 12px;
      padding: 9px 13px;
      font: inherit;
      font-weight: 600;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn.primary {
      background: var(--accent);
      color: #ffffff;
    }

    .btn.ghost {
      background: transparent;
      border-color: var(--line-soft);
      color: var(--text-main);
    }

    .btn:disabled,
    .composer-input:disabled {
      opacity: 0.6;
      cursor: not-allowed;
    }

    .input-panel-message {
      color: var(--text-muted);
      font-size: 0.94rem;
    }

    .input-required-card {
      width: min(92%, 760px);
      color: var(--text-main);
    }

    .input-panel-title {
      font-weight: 700;
      margin-bottom: 8px;
    }

    .input-required-card .input-panel-message {
      margin-bottom: 10px;
    }

    .modal-input-form {
      display: grid;
      gap: 8px;
    }

    .input-panel-actions {
      display: flex;
      justify-content: flex-end;
      gap: 8px;
      margin-top: 8px;
    }

    .input-upload-wrap {
      margin-top: 10px;
      border: 1px solid var(--line-soft);
      border-radius: 11px;
      padding: 8px;
      background: var(--bg-panel);
      display: grid;
      gap: 6px;
    }

    .input-upload-title-line {
      display: flex;
      align-items: baseline;
      gap: 6px;
      flex-wrap: wrap;
    }

    .input-upload-title {
      font-weight: 600;
    }

    .input-upload-title-help {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .input-upload-control {
      width: 100%;
      border: 1px dashed var(--line-soft);
      border-radius: 10px;
      background: var(--bg-input);
      color: var(--text-main);
      padding: 8px;
      font: inherit;
      cursor: pointer;
    }

    .input-upload-list {
      color: var(--text-muted);
      display: grid;
      gap: 6px;
      min-height: 18px;
    }

    .input-upload-item {
      display: flex;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--line-soft);
      border-radius: 8px;
      padding: 4px 6px;
      background: var(--bg-input);
    }

    .input-upload-item-path {
      flex: 1 1 auto;
      overflow-wrap: anywhere;
      word-break: break-word;
    }

    .input-upload-remove {
      border: 1px solid var(--line-soft);
      border-radius: 8px;
      background: transparent;
      color: var(--text-muted);
      width: 30px;
      height: 30px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .input-upload-remove:disabled {
      opacity: 0.6;
      cursor: not-allowed;
    }

    .question {
      border: 1px solid var(--line-soft);
      border-radius: 11px;
      padding: 8px;
      background: var(--bg-panel);
    }

    .question-title {
      margin-bottom: 8px;
      font-weight: 600;
    }

    .choice {
      display: flex;
      gap: 7px;
      margin-bottom: 6px;
      align-items: flex-start;
    }

    .choice input {
      margin-top: 3px;
      accent-color: var(--accent);
    }

    .free-input {
      width: 100%;
      min-height: 74px;
      resize: vertical;
      border-radius: 10px;
      border: 1px solid var(--line-soft);
      background: var(--bg-input);
      color: var(--text-main);
      font: inherit;
      padding: 8px;
      outline: none;
    }

    .identity-modal {
      border: 1px solid var(--line-soft);
      border-radius: 16px;
      width: min(500px, calc(100vw - 26px));
      padding: 0;
      background: var(--bg-panel);
      color: var(--text-main);
    }

    .identity-modal::backdrop {
      background: rgba(10, 16, 29, 0.54);
      backdrop-filter: blur(1px);
    }

    .modal-content {
      padding: 14px;
      display: grid;
      gap: 10px;
    }

    .modal-title {
      margin: 0;
      font-family: "Space Grotesk", "Source Sans 3", sans-serif;
      font-size: 1.08rem;
    }

    .modal-text {
      margin: 0;
      color: var(--text-muted);
    }

    .field-block {
      display: grid;
      gap: 6px;
    }

    .field-block label {
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    .field-input {
      width: 100%;
      border: 1px solid var(--line-soft);
      border-radius: 10px;
      padding: 9px 10px;
      font: inherit;
      color: var(--text-main);
      background: var(--bg-input);
      outline: none;
    }

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

    .modal-error {
      min-height: 18px;
      color: color-mix(in oklab, #be352f 72%, var(--text-main));
      font-size: 0.9rem;
    }

    .modal-actions {
      display: flex;
      justify-content: flex-end;
      gap: 8px;
      margin-top: 2px;
    }

    @media (max-width: 760px) {
      .shell {
        padding: 10px;
      }

      .banner {
        padding: 0 10px;
      }

      .brand-title {
        font-size: 1.04rem;
      }

      .messages {
        max-height: calc(100vh - 295px);
        padding: 10px;
      }

      .bubble.from-user {
        margin-right: 6px;
      }

      .bubble {
        max-width: 92%;
      }

      .composer-row {
        flex-wrap: wrap;
      }

      .btn {
        flex: 1 1 120px;
      }
    }

    @media (max-width: 600px) {
      .brand-title {
        display: none;
      }
    }