.mergeclass-chat {
  color-scheme: light;
  --ui-bg: #f7fafc;
  --ui-surface: #ffffff;
  --ui-soft: #edf6ff;
  --ui-soft-2: #f8fbff;
  --ui-text: #1f2937;
  --ui-muted: #718096;
  --ui-line: #dbe5f1;
  --ui-primary: #2f80d0;
  --ui-primary-strong: #1769c2;
  --ui-danger: #e5484d;
  --ui-radius: 12px;
  --ui-radius-sm: 8px;
  --ui-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 32px rgba(15, 23, 42, 0.05);
  position: relative;
  width: 100%;
  min-height: 0;
  overflow: hidden;
  color: var(--ui-text);
  background: var(--ui-bg);
  font-family: "Google Sans", "Sarabun", "Segoe UI", Tahoma, Arial, sans-serif;
  line-height: 1.55;
}

.mergeclass-chat--standalone { position: fixed; inset: 0; height: 100dvh; }
.mergeclass-chat--embedded { height: 100%; }
.mergeclass-chat, .mergeclass-chat * { box-sizing: border-box; letter-spacing: 0; }
.mergeclass-chat button, .mergeclass-chat input, .mergeclass-chat textarea { font: inherit; }
.mergeclass-chat button, .mergeclass-chat a { -webkit-tap-highlight-color: transparent; }
.mergeclass-chat[hidden], .mergeclass-chat [hidden] { display: none !important; }
.mergeclass-chat .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.mergeclass-chat--embedded [data-standalone-only] { display: none !important; }

.mergeclass-chat .chat-skeleton { position: absolute; inset: 0; display: grid; min-height: 0; grid-template-columns: 330px minmax(0, 1fr); background: var(--ui-bg); }
.mergeclass-chat .skeleton-sidebar { display: flex; min-width: 0; flex-direction: column; background: var(--ui-surface); border-right: 1px solid var(--ui-line); }
.mergeclass-chat .skeleton-brand { display: flex; min-height: 88px; align-items: center; gap: 12px; padding: 18px 22px; border-bottom: 1px solid var(--ui-line); }
.mergeclass-chat .skeleton-brand > span:last-child, .mergeclass-chat .skeleton-account > span:last-child, .mergeclass-chat .skeleton-room > span:last-child, .mergeclass-chat .skeleton-conversation__header > span:last-child { display: grid; min-width: 0; flex: 1; gap: 7px; }
.mergeclass-chat .skeleton-account { display: flex; align-items: center; gap: 11px; margin: 16px 18px 8px; padding: 12px 14px; background: var(--ui-soft-2); border: 1px solid #e5edf6; border-radius: var(--ui-radius); }
.mergeclass-chat .skeleton-block { display: block; overflow: hidden; background: linear-gradient(90deg, #e8eef5 20%, #f4f7fa 38%, #e8eef5 58%); background-size: 220% 100%; border-radius: 7px; animation: mergeclass-chat-skeleton-shimmer 1.45s ease-in-out infinite; }
.mergeclass-chat .skeleton-logo { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 8px; }
.mergeclass-chat .skeleton-avatar { flex: 0 0 auto; width: 40px; height: 40px; border-radius: 10px; }
.mergeclass-chat .skeleton-avatar--room { width: 44px; height: 44px; }
.mergeclass-chat .skeleton-line { width: 100%; height: 10px; }
.mergeclass-chat .skeleton-line--brand { width: 112px; height: 15px; }
.mergeclass-chat .skeleton-line--header { width: 160px; height: 13px; }
.mergeclass-chat .skeleton-line--wide { width: 86%; }
.mergeclass-chat .skeleton-line--medium { width: 66%; }
.mergeclass-chat .skeleton-line--short { width: 44%; height: 8px; }
.mergeclass-chat .skeleton-search { height: 42px; margin: 8px 18px 12px; border: 1px solid #e2eaf2; border-radius: var(--ui-radius-sm); }
.mergeclass-chat .skeleton-room-list { display: grid; gap: 4px; padding: 4px 10px; }
.mergeclass-chat .skeleton-label { width: 76px; height: 8px; margin: 14px 12px 8px; }
.mergeclass-chat .skeleton-room { display: flex; min-height: 62px; align-items: center; gap: 11px; padding: 9px 11px; }
.mergeclass-chat .skeleton-conversation { display: grid; min-width: 0; grid-template-rows: auto minmax(0, 1fr) auto; background: var(--ui-bg); }
.mergeclass-chat .skeleton-conversation__header { display: flex; min-height: 76px; align-items: center; gap: 12px; padding: 13px 24px; background: var(--ui-surface); border-bottom: 1px solid var(--ui-line); }
.mergeclass-chat .skeleton-messages { display: flex; min-height: 0; flex-direction: column; justify-content: flex-end; gap: 14px; padding: 26px clamp(18px, 4vw, 52px); }
.mergeclass-chat .skeleton-message { display: grid; width: min(48%, 420px); gap: 7px; }
.mergeclass-chat .skeleton-message i { height: 46px; border-radius: 4px 12px 12px 12px; }
.mergeclass-chat .skeleton-message i + i { width: 66%; height: 34px; }
.mergeclass-chat .skeleton-message--right { width: min(38%, 330px); align-self: flex-end; }
.mergeclass-chat .skeleton-message--right i { border-radius: 12px 4px 12px 12px; }
.mergeclass-chat .skeleton-composer { display: grid; grid-template-columns: minmax(0, 1fr) 46px; gap: 10px; padding: 10px clamp(16px, 3vw, 34px) 14px; border-top: 1px solid var(--ui-line); }
.mergeclass-chat .skeleton-composer i, .mergeclass-chat .skeleton-composer span { height: 46px; border-radius: var(--ui-radius); }

@keyframes mergeclass-chat-skeleton-shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

.mergeclass-chat .chat-app { position: absolute; inset: 0; display: grid; min-height: 0; grid-template-columns: 330px minmax(0, 1fr); overflow: hidden; background: var(--ui-bg); }
.mergeclass-chat .room-panel { display: flex; min-width: 0; min-height: 0; flex-direction: column; overflow: hidden; color: var(--ui-text); background: var(--ui-surface); border-right: 1px solid var(--ui-line); }
.mergeclass-chat .room-panel__brand { display: flex; min-height: 88px; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid var(--ui-line); }
.mergeclass-chat .brand { display: inline-flex; min-width: 0; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.mergeclass-chat .brand__mark { display: grid; flex: 0 0 auto; width: 40px; height: 40px; place-items: center; overflow: hidden; color: white; background: var(--ui-primary); border-radius: 8px; box-shadow: 0 14px 32px rgba(47, 128, 208, 0.18); }
.mergeclass-chat .brand__mark img { display: block; width: 100%; height: 100%; object-fit: cover; }
.mergeclass-chat .brand__mark--large { width: 76px; height: 76px; border-radius: 18px; }
.mergeclass-chat .brand strong, .mergeclass-chat .brand small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mergeclass-chat .brand strong { color: var(--ui-text); font-size: 20px; font-weight: 600; line-height: 1.1; }
.mergeclass-chat .brand small { margin-top: 3px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 12px; font-weight: 400; }
.mergeclass-chat .icon-button { display: grid; flex: 0 0 auto; width: 40px; height: 40px; padding: 0; place-items: center; color: #68768f; background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: var(--ui-radius-sm); cursor: pointer; transition: background .16s ease, color .16s ease, border-color .16s ease; }
.mergeclass-chat .icon-button:hover { color: var(--ui-primary); background: var(--ui-soft); border-color: #bfdbf7; }
.mergeclass-chat .icon-button:focus-visible, .mergeclass-chat .room-item:focus-visible, .mergeclass-chat .send-button:focus-visible, .mergeclass-chat .main-return:focus-visible, .mergeclass-chat .primary-link:focus-visible { outline: 2px solid var(--ui-primary); outline-offset: 2px; }
.mergeclass-chat .icon-button svg, .mergeclass-chat .room-search svg, .mergeclass-chat .send-button svg { width: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.mergeclass-chat .account-strip { display: flex; align-items: center; gap: 11px; margin: 16px 18px 8px; padding: 12px 14px; background: var(--ui-soft-2); border: 1px solid #e5edf6; border-radius: var(--ui-radius); }
.mergeclass-chat .account-strip > span:last-child { min-width: 0; }
.mergeclass-chat .account-strip strong, .mergeclass-chat .account-strip small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mergeclass-chat .account-strip strong { color: #334155; font-size: 14px; font-weight: 600; }
.mergeclass-chat .account-strip small { margin-top: 2px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 12px; }
.mergeclass-chat .contact-tools { padding: 0 18px 8px; }
.mergeclass-chat .contact-tool { width: 100%; min-height: 38px; padding: 8px 12px; color: var(--ui-primary-strong); background: var(--ui-soft); border: 1px solid #cfe1f5; border-radius: var(--ui-radius-sm); font-size: 12px; font-weight: 600; cursor: pointer; }
.mergeclass-chat .contact-tool:hover { background: #e2f1ff; border-color: #aed2f4; }
.mergeclass-chat .avatar { display: grid; flex: 0 0 auto; width: 40px; height: 40px; overflow: hidden; place-items: center; color: var(--ui-primary-strong); background: #eaf3ff; border-radius: 10px; font-size: 13px; font-weight: 700; }
.mergeclass-chat .avatar img, .mergeclass-chat .room-item__avatar img { display: block; width: 100%; height: 100%; object-fit: cover; }
.mergeclass-chat .room-search { display: flex; align-items: center; gap: 9px; margin: 8px 18px 12px; padding: 0 12px; color: #8da0b6; background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: var(--ui-radius-sm); transition: border-color .16s ease, box-shadow .16s ease; }
.mergeclass-chat .room-search:focus-within { border-color: var(--ui-primary); box-shadow: 0 0 0 3px rgba(47, 128, 208, .1); }
.mergeclass-chat .room-search input { width: 100%; height: 42px; color: var(--ui-text); background: transparent; border: 0; outline: 0; }
.mergeclass-chat .room-search input::placeholder { color: #9aa9ba; }
.mergeclass-chat .room-list { min-height: 0; flex: 1; overflow-y: auto; padding: 0 10px 12px; overscroll-behavior: contain; scrollbar-color: #c8d7e7 transparent; }
.mergeclass-chat .room-list__loading, .mergeclass-chat .room-list__empty { padding: 28px 16px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 13px; text-align: center; }
.mergeclass-chat .room-group-label { margin: 17px 12px 6px; color: #94a3b8; font-size: 11px; font-weight: 700; }
.mergeclass-chat .room-item { display: grid; width: 100%; grid-template-columns: 42px minmax(0, 1fr) auto; gap: 11px; align-items: center; min-height: 62px; padding: 9px 11px; color: #475569; text-align: left; background: transparent; border: 0; border-radius: var(--ui-radius-sm); cursor: pointer; transition: background .16s ease, color .16s ease; }
.mergeclass-chat .room-item:hover { color: var(--ui-primary-strong); background: #f3f8fe; }
.mergeclass-chat .room-item.is-active { color: var(--ui-primary-strong); background: #e9f5ff; font-weight: 500; }
.mergeclass-chat .room-item__avatar { display: grid; width: 42px; height: 42px; overflow: hidden; place-items: center; color: var(--ui-primary-strong); background: #eaf3ff; border-radius: 10px; font-size: 13px; font-weight: 700; }
.mergeclass-chat .room-item__avatar svg, .mergeclass-chat .avatar--room svg { width: 21px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.mergeclass-chat .room-item--group .room-item__avatar { color: #fff; background: var(--ui-primary); }
.mergeclass-chat .room-item.is-active .room-item__avatar { color: #fff; background: var(--ui-primary); box-shadow: 0 8px 20px rgba(47, 128, 208, .18); }
.mergeclass-chat .room-item__copy { min-width: 0; }
.mergeclass-chat .room-item strong, .mergeclass-chat .room-item small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mergeclass-chat .room-item strong { font-size: 14px; font-weight: 600; }
.mergeclass-chat .room-item small { margin-top: 2px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 11px; font-weight: 400; }
.mergeclass-chat .room-item.has-unread strong { color: var(--ui-text); font-weight: 700; }
.mergeclass-chat .room-item__badge { display: grid; min-width: 22px; height: 22px; padding: 0 6px; place-items: center; color: #fff; background: #dc2626; border-radius: 999px; font-size: 10px; font-weight: 700; line-height: 1; }
.mergeclass-chat .room-panel__footer { padding: 11px 20px calc(11px + env(safe-area-inset-bottom)); color: #94a3b8; border-top: 1px solid var(--ui-line); font-family: "Sarabun", sans-serif; font-size: 10px; text-align: center; }

.mergeclass-chat .conversation-panel { position: relative; min-width: 0; min-height: 0; height: 100%; overflow: hidden; background: var(--ui-bg); }
.mergeclass-chat .conversation-empty { display: grid; height: 100%; max-width: 620px; margin: auto; padding: 48px; place-content: center; text-align: center; }
.mergeclass-chat .conversation-empty h1, .mergeclass-chat .auth-card h1 { margin: 7px 0 10px; color: var(--ui-text); font-size: clamp(28px, 4vw, 40px); font-weight: 600; line-height: 1.15; }
.mergeclass-chat .conversation-empty p:not(.eyebrow), .mergeclass-chat .auth-card p:not(.eyebrow) { max-width: 520px; margin: 0 auto; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 15px; line-height: 1.7; }
.mergeclass-chat .eyebrow { margin: 0; color: var(--ui-primary); font-size: 11px; font-weight: 700; }
.mergeclass-chat .empty-illustration { position: relative; width: 148px; height: 104px; margin: 0 auto 24px; }
.mergeclass-chat .empty-illustration span { position: absolute; width: 83px; height: 53px; background: var(--ui-surface); border: 2px solid var(--ui-primary); border-radius: 14px 14px 14px 4px; box-shadow: var(--ui-shadow); }
.mergeclass-chat .empty-illustration span::after { content: ""; position: absolute; top: 18px; left: 18px; width: 38px; height: 4px; background: #cfe1f5; border-radius: 9px; box-shadow: 0 11px 0 #dbe8f5; }
.mergeclass-chat .empty-illustration span:nth-child(1) { top: 5px; left: 3px; transform: rotate(-5deg); }
.mergeclass-chat .empty-illustration span:nth-child(2) { top: 35px; right: 2px; border-color: #20a4a8; transform: rotate(5deg); }
.mergeclass-chat .empty-illustration span:nth-child(3) { top: 51px; left: 28px; width: 45px; height: 32px; background: var(--ui-primary); border-color: var(--ui-primary); }
.mergeclass-chat .empty-illustration span:nth-child(3)::after { display: none; }

.mergeclass-chat .conversation { display: grid; height: 100%; min-height: 0; grid-template-rows: auto minmax(0, 1fr) auto auto; overflow: hidden; }
.mergeclass-chat .conversation__header { display: flex; min-height: 76px; align-items: center; gap: 12px; padding: 13px 24px; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--ui-line); backdrop-filter: blur(10px); }
.mergeclass-chat .conversation__back { display: none; color: var(--ui-text); }
.mergeclass-chat .avatar--room { width: 44px; height: 44px; color: #fff; background: var(--ui-primary); border-radius: 10px; box-shadow: 0 8px 20px rgba(47, 128, 208, .16); }
.mergeclass-chat .conversation__identity { min-width: 0; }
.mergeclass-chat .conversation__identity strong, .mergeclass-chat .conversation__identity small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mergeclass-chat .conversation__identity strong { color: #334155; font-size: 16px; font-weight: 600; }
.mergeclass-chat .conversation__identity small { margin-top: 2px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 12px; }
.mergeclass-chat .conversation__identity small.is-direct-online { width: 8px; height: 8px; margin-top: 6px; overflow: visible; background: #22c55e; border: 1px solid #dcfce7; border-radius: 50%; box-shadow: 0 0 0 2px rgba(34, 197, 94, .14); }
.mergeclass-chat .main-return { margin-left: auto; padding: 8px 13px; color: var(--ui-primary-strong); background: var(--ui-surface); border: 1px solid #cfe1f5; border-radius: var(--ui-radius-sm); font-size: 12px; font-weight: 600; text-decoration: none; transition: background .16s ease, border-color .16s ease; }
.mergeclass-chat .main-return:hover { background: var(--ui-soft); border-color: #aed2f4; }
.mergeclass-chat .contact-room-action { margin-left: auto; padding: 7px 11px; color: #b4232c; background: #fff5f5; border: 1px solid #fecaca; border-radius: var(--ui-radius-sm); font-size: 11px; font-weight: 600; cursor: pointer; }
.mergeclass-chat .contact-room-action:not([hidden]) + .main-return { margin-left: 0; }
.mergeclass-chat .message-stage { min-height: 0; overflow-y: auto; padding: 20px clamp(12px, 2vw, 24px) 10px; overscroll-behavior: contain; scrollbar-color: #c8d7e7 transparent; }
.mergeclass-chat .conversation.is-history-loading .message-stage { visibility: hidden; }
.mergeclass-chat .message-list { display: flex; min-height: 100%; flex-direction: column; justify-content: flex-end; gap: 8px; }
.mergeclass-chat .load-earlier { display: block; margin: 0 auto 16px; padding: 7px 13px; color: var(--ui-primary-strong); background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: var(--ui-radius-sm); cursor: pointer; }
.mergeclass-chat .load-earlier:hover { background: var(--ui-soft); }
.mergeclass-chat .message { display: flex; max-width: min(72%, 680px); flex-direction: column; align-self: flex-start; }
.mergeclass-chat .message.is-mine { align-self: flex-end; align-items: flex-end; }
.mergeclass-chat .message__incoming { display: flex; align-items: flex-end; gap: 8px; min-width: 0; }
.mergeclass-chat .message__avatar { width: 28px; height: 28px; align-self: flex-end; border-radius: 50%; font-size: 10px; }
.mergeclass-chat .message__stack { display: flex; min-width: 0; flex-direction: column; align-items: flex-start; }
.mergeclass-chat .message__sender { margin: 0 9px 3px; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 10px; font-weight: 600; }
.mergeclass-chat .message__content { display: flex; align-self: flex-start; align-items: flex-end; gap: 6px; min-width: 0; }
.mergeclass-chat .message.is-mine .message__content { align-self: flex-end; flex-direction: row-reverse; }
.mergeclass-chat .message__bubble { position: relative; min-width: 82px; padding: 6px 13px; color: var(--ui-text); background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: 18px 18px 18px 4px; box-shadow: 0 2px 4px rgba(15, 23, 42, .08); }
.mergeclass-chat .message:not(.is-mine) .message__bubble::after { position: absolute; bottom: -1px; left: -7px; width: 12px; height: 10px; content: ''; background: var(--ui-surface); border-bottom: 1px solid var(--ui-line); border-left: 1px solid var(--ui-line); border-bottom-left-radius: 2px; clip-path: polygon(100% 0, 100% 100%, 0 100%); }
.mergeclass-chat .message--actionable .message__bubble { cursor: pointer; }
.mergeclass-chat .message--actionable:focus-visible { outline: 2px solid var(--ui-primary); outline-offset: 3px; border-radius: 12px; }
.mergeclass-chat .message--actionable.is-actions-open .message__bubble { box-shadow: 0 0 0 2px rgba(47, 128, 208, .18); }
.mergeclass-chat .message.is-mine .message__bubble { color: #fff; background: var(--ui-primary); border-color: var(--ui-primary); border-radius: 18px 18px 4px 18px; }
.mergeclass-chat .message.is-mine .message__bubble::after { position: absolute; right: -7px; bottom: -1px; width: 12px; height: 10px; content: ''; background: var(--ui-primary); border-right: 1px solid var(--ui-primary); border-bottom: 1px solid var(--ui-primary); border-bottom-right-radius: 2px; clip-path: polygon(0 0, 100% 100%, 0 100%); }
.mergeclass-chat .message__body { margin: 0; overflow-wrap: anywhere; white-space: pre-wrap; font-family: "Sarabun", sans-serif; font-size: 14px; line-height: 1.55; }
.mergeclass-chat .message__link { color: var(--ui-primary-strong); font-weight: 500; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.mergeclass-chat .message__link:visited { color: var(--ui-primary-strong); }
.mergeclass-chat .message.is-mine .message__link, .mergeclass-chat .message.is-mine .message__link:visited { color: #fff; }
.mergeclass-chat .message__body.is-deleted { color: var(--ui-muted); font-style: italic; }
.mergeclass-chat .message.is-mine .message__body.is-deleted { color: #dceeff; }
.mergeclass-chat .message__meta { display: flex; align-items: center; gap: 7px; margin: 0 0 3px; color: #94a3b8; font-size: 9px; white-space: nowrap; }
.mergeclass-chat .message__delete { min-height: 24px; padding: 2px 7px; color: #b4232c; background: #fff; border: 1px solid #fecaca; border-radius: 999px; cursor: pointer; font-size: 10px; font-weight: 600; }
.mergeclass-chat .message.is-mine .message__delete { color: #fff; background: rgba(127, 29, 29, .3); border-color: rgba(255, 255, 255, .65); }
.mergeclass-chat .typing-line { min-height: 24px; padding: 2px clamp(22px, 4vw, 56px); color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 11px; }
.mergeclass-chat .composer { display: flex; align-items: flex-end; gap: 10px; padding: 10px clamp(16px, 3vw, 34px) calc(14px + env(safe-area-inset-bottom)); background: rgba(247, 250, 252, .96); border-top: 1px solid var(--ui-line); }
.mergeclass-chat .composer__field { flex: 1; }
.mergeclass-chat .composer textarea { display: block; width: 100%; min-height: 46px; max-height: 132px; resize: none; padding: 12px 15px; color: var(--ui-text); background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: var(--ui-radius); outline: 0; font-family: "Sarabun", sans-serif; line-height: 1.45; }
.mergeclass-chat .composer textarea:focus { border-color: var(--ui-primary); box-shadow: 0 0 0 3px rgba(47, 128, 208, .1); }
.mergeclass-chat .send-button { display: grid; width: 46px; height: 46px; padding: 0; place-items: center; color: #fff; background: var(--ui-primary); border: 0; border-radius: var(--ui-radius); box-shadow: 0 8px 20px rgba(47, 128, 208, .2); cursor: pointer; transition: background .16s ease, transform .16s ease; }
.mergeclass-chat .send-button:hover { background: var(--ui-primary-strong); transform: translateY(-1px); }
.mergeclass-chat .send-button:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.mergeclass-chat .auth-state { position: absolute; inset: 0; z-index: 20; display: grid; padding: 24px; place-items: center; background: var(--ui-bg); }
.mergeclass-chat .auth-card { width: min(100%, 500px); padding: 40px; text-align: center; background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: 16px; box-shadow: var(--ui-shadow); }
.mergeclass-chat .auth-card .brand__mark { margin: 0 auto 24px; }
.mergeclass-chat .auth-card h1 { font-size: 30px; }
.mergeclass-chat .primary-link { display: inline-flex; margin-top: 24px; padding: 11px 18px; color: #fff; background: var(--ui-primary); border: 0; border-radius: var(--ui-radius-sm); font-weight: 600; text-decoration: none; cursor: pointer; transition: background .16s ease; }
.mergeclass-chat .primary-link:hover { background: var(--ui-primary-strong); }
.mergeclass-chat .contact-modal { position: absolute; inset: 0; z-index: 50; display: grid; padding: 20px; place-items: center; }
.mergeclass-chat .contact-modal__backdrop { position: absolute; inset: 0; background: rgba(15, 30, 54, .38); backdrop-filter: blur(3px); }
.mergeclass-chat .contact-modal__dialog { position: relative; display: grid; width: min(100%, 520px); max-height: min(720px, calc(100% - 16px)); grid-template-rows: auto minmax(0, 1fr); overflow: hidden; background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: 16px; box-shadow: 0 24px 70px rgba(15, 30, 54, .2); }
.mergeclass-chat .contact-modal__header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 20px; border-bottom: 1px solid var(--ui-line); }
.mergeclass-chat .contact-modal__header h2 { margin: 3px 0 0; color: var(--ui-text); font-size: 20px; }
.mergeclass-chat .contact-modal__body { min-height: 0; overflow-y: auto; padding: 20px; }
.mergeclass-chat .contact-connect-form { display: grid; gap: 12px; }
.mergeclass-chat .contact-connect-form label { color: var(--ui-text); font-size: 14px; font-weight: 600; }
.mergeclass-chat .contact-connect-form p, .mergeclass-chat .contact-help { margin: 0; color: var(--ui-muted); font-family: "Sarabun", sans-serif; font-size: 13px; line-height: 1.6; }
.mergeclass-chat .contact-connect-form input { width: 100%; height: 46px; padding: 0 14px; color: var(--ui-text); background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: var(--ui-radius-sm); outline: 0; text-transform: uppercase; }
.mergeclass-chat .contact-connect-form input:focus { border-color: var(--ui-primary); box-shadow: 0 0 0 3px rgba(47, 128, 208, .1); }
.mergeclass-chat .contact-modal button { min-height: 38px; padding: 8px 12px; color: var(--ui-primary-strong); background: var(--ui-surface); border: 1px solid #cfe1f5; border-radius: var(--ui-radius-sm); font-size: 12px; font-weight: 600; cursor: pointer; }
.mergeclass-chat .contact-modal button:disabled { opacity: .55; cursor: wait; }
.mergeclass-chat .contact-modal .icon-button { min-height: 40px; padding: 0; }
.mergeclass-chat .contact-modal .contact-primary { color: #fff; background: var(--ui-primary); border-color: var(--ui-primary); }
.mergeclass-chat .contact-modal .contact-danger { color: #b4232c; background: #fff5f5; border-color: #fecaca; }
.mergeclass-chat .teacher-code-panel { display: grid; gap: 16px; }
.mergeclass-chat .teacher-code-card { display: grid; justify-items: center; gap: 7px; padding: 18px; background: var(--ui-soft-2); border: 1px solid var(--ui-line); border-radius: var(--ui-radius); }
.mergeclass-chat .teacher-code-card img { width: min(230px, 76vw); aspect-ratio: 1; background: #fff; border-radius: 10px; }
.mergeclass-chat .teacher-code-card strong { color: var(--ui-text); font-size: 22px; letter-spacing: .08em; }
.mergeclass-chat .teacher-code-card small { color: var(--ui-muted); font-family: "Sarabun", sans-serif; }
.mergeclass-chat .contact-modal__actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.mergeclass-chat .blocked-contacts { padding-top: 14px; border-top: 1px solid var(--ui-line); }
.mergeclass-chat .blocked-contacts h3 { margin: 0 0 9px; color: var(--ui-text); font-size: 13px; }
.mergeclass-chat .blocked-contact-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 0; border-top: 1px solid #edf2f7; }
.mergeclass-chat .blocked-contact-row span { min-width: 0; }
.mergeclass-chat .blocked-contact-row strong, .mergeclass-chat .blocked-contact-row small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mergeclass-chat .blocked-contact-row strong { color: var(--ui-text); font-size: 13px; }
.mergeclass-chat .blocked-contact-row small { color: var(--ui-muted); font-size: 11px; }
.mergeclass-chat .toast { position: absolute; z-index: 40; right: 20px; bottom: 20px; max-width: min(370px, calc(100% - 40px)); padding: 11px 15px; color: #fff; background: #334155; border-radius: var(--ui-radius-sm); box-shadow: var(--ui-shadow); font-family: "Sarabun", sans-serif; font-size: 13px; }

@media (max-width: 760px) {
  .mergeclass-chat .chat-skeleton { display: block; }
  .mergeclass-chat .skeleton-sidebar { width: 100%; height: 100%; }
  .mergeclass-chat .skeleton-conversation { display: none; }
  .mergeclass-chat .skeleton-brand { min-height: 76px; padding: calc(14px + env(safe-area-inset-top)) 16px 14px; }
  .mergeclass-chat .chat-app { display: block; }
  .mergeclass-chat .room-panel, .mergeclass-chat .conversation-panel { width: 100%; height: 100%; }
  .mergeclass-chat .conversation-panel { display: none; }
  .mergeclass-chat.is-room-open .room-panel { display: none; }
  .mergeclass-chat.is-room-open .conversation-panel { display: block; }
  .mergeclass-chat .conversation-empty { display: none; }
  .mergeclass-chat .room-panel__brand { min-height: 76px; padding: calc(14px + env(safe-area-inset-top)) 16px 14px; }
  .mergeclass-chat .conversation__header { min-height: 68px; padding: calc(10px + env(safe-area-inset-top)) 12px 10px; }
  .mergeclass-chat .conversation__back { display: grid; }
  .mergeclass-chat .main-return { display: none; }
  .mergeclass-chat .contact-room-action { margin-left: auto; }
  .mergeclass-chat .message-stage { padding-inline: 13px; }
  .mergeclass-chat .message { max-width: 86%; }
  .mergeclass-chat .composer { padding-inline: 11px; }
  .mergeclass-chat .room-panel__footer { display: none; }
  .mergeclass-chat .auth-card { padding: 32px 22px; }
  .mergeclass-chat .contact-modal { padding: 10px; }
  .mergeclass-chat .contact-modal__dialog { max-height: calc(100% - 8px); }
  .mergeclass-chat .contact-modal__actions { grid-template-columns: 1fr; }
  .mergeclass-chat .toast { bottom: calc(20px + env(safe-area-inset-bottom)); }
}

@media (prefers-reduced-motion: reduce) {
  .mergeclass-chat, .mergeclass-chat *, .mergeclass-chat *::before, .mergeclass-chat *::after { scroll-behavior: auto !important; transition: none !important; }
  .mergeclass-chat .skeleton-block { animation: none; }
}