/* public/css/app.css — khung chat (C1.6a). Desktop 2 cột; ≤ 720px 1 cột, chuyển cảnh bằng .app.dang-xem */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font: 15px/1.45 var(--sans); color: var(--chu); background: var(--nen); -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
[hidden] { display: none !important; }

.nut { min-height: var(--cham); padding: 0 16px; border: 1px solid var(--vien-dam); border-radius: 10px; background: var(--giay); color: var(--chu); cursor: pointer; }
.nut:hover { border-color: var(--navy-mem); }
.nut-chinh { background: var(--navy); border-color: var(--navy); color: #fff; font-weight: 600; }
.nut-chinh:hover { background: var(--navy-dam); }
.nut-nho { min-height: 36px; padding: 0 10px; }
.loi { color: var(--do); margin: 0; }

/* Đăng nhập */
.man-dang-nhap { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.the-dang-nhap { width: min(100%, 380px); background: var(--giay); border: 1px solid var(--vien); border-radius: var(--bo); padding: 24px; display: grid; gap: 14px; }
.the-dang-nhap h1 { margin: 0; font-size: 22px; color: var(--navy); }
.the-dang-nhap .mo { margin: 0; color: var(--chu-mo); }
.the-dang-nhap label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
.the-dang-nhap input { min-height: var(--cham); padding: 0 12px; border: 1px solid var(--vien-dam); border-radius: 10px; }

/* Khung 2 cột */
.app { height: 100%; display: grid; grid-template-columns: 320px 1fr; }
.ben { background: var(--giay); border-right: 1px solid var(--vien); display: flex; flex-direction: column; min-height: 0; }
.ben-dau { display: flex; align-items: center; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--vien); background: var(--navy); color: #fff; }
.ben-dau .thuong-hieu { flex: 1 0 auto; white-space: nowrap; font-size: 15px; } /* 1 dòng ở mọi cỡ (C7.3) */
.ben-dau .toi { position: relative; flex: 0 1 auto; min-width: 64px; }
.ben-dau .nut-toi { display: inline-flex; align-items: center; gap: 4px; max-width: 100%; width: 100%; justify-content: space-between; }
.toi-ten { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 220px; padding: 6px; display: grid; gap: 2px; background: var(--giay); color: var(--chu); border: 1px solid var(--vien); border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.18); z-index: 30; }
.menu[hidden] { display: none; }
.menu-ten { padding: 6px 12px 8px; font-size: 13px; color: var(--chu-mo); border-bottom: 1px solid var(--vien); margin-bottom: 4px; white-space: normal; }
.menu-muc { display: flex; align-items: center; min-height: var(--cham); padding: 0 12px; border: 0; border-radius: 8px; background: transparent; color: var(--chu); font: inherit; text-align: left; text-decoration: none; cursor: pointer; }
.menu-muc:hover, .menu-muc:focus-visible { background: var(--nen); outline: none; }
#nut-dang-xuat { color: var(--do-dam); }
.ben-dau .nut-nho { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.ben-dau .lk-dau { text-decoration: none; display: inline-flex; align-items: center; font-size: 13px; font-weight: 600; }
.ds-hoi-thoai { list-style: none; margin: 0; padding: 6px; overflow-y: auto; flex: 1; }
.ds-hoi-thoai li { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; padding: 10px 12px; border-radius: 10px; cursor: pointer; min-height: var(--cham); }
.ds-hoi-thoai li:hover { background: var(--nen); }
.ds-hoi-thoai li.chon { background: var(--vang-nhat); }
.ds-hoi-thoai .ht-ten { grid-column: 1; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ds-hoi-thoai .ht-cuoi { grid-column: 1; color: var(--chu-mo); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ds-hoi-thoai .ht-chua-doc { grid-column: 2; grid-row: 1 / span 2; align-self: center; justify-self: end; /* không đặt cột → grid xếp vào cột 1 và kéo dài cả hàng (C7.2) */ min-width: 22px; height: 22px; padding: 0 6px; border-radius: 11px; background: var(--vang); color: var(--navy); font-size: 12px; font-weight: 700; display: grid; place-items: center; }
.ds-hoi-thoai .ht-chua-doc:empty { display: none; }
.trong-nho { color: var(--chu-mo); padding: 16px; text-align: center; }

.chinh { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.chinh-trong { margin: auto; color: var(--chu-mo); }
.khung { display: flex; flex-direction: column; height: 100%; min-height: 0; }
.khung-dau { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: var(--giay); border-bottom: 1px solid var(--vien); min-height: 56px; }
.khung-ten { display: grid; min-width: 0; }
.khung-ten strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dang-go { color: var(--chu-mo); font-size: 12px; min-height: 16px; }
.chi-mobile { display: none; }
.banner-mang { background: var(--vang-nhat); color: var(--vang-dam); padding: 6px 14px; font-size: 13px; text-align: center; }

/* Tin */
.tin-cuon { flex: 1; overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 6px; overscroll-behavior: contain; }
.tin { display: grid; max-width: min(78%, 640px); }
.tin.cua-toi { justify-self: end; }
.tin.he-thong { justify-self: center; max-width: 90%; }
.bong { background: var(--giay); border: 1px solid var(--vien); border-radius: var(--bo); padding: 8px 12px; display: grid; gap: 2px; word-break: break-word; }
.tin.cua-toi .bong { background: var(--navy); border-color: var(--navy); color: #fff; }
.tin.he-thong .bong { background: transparent; border: 0; color: var(--chu-mo); font-size: 13px; text-align: center; }
.tin.loi .bong { border-color: var(--do); }
.tin-ten { font-size: 12px; font-weight: 700; color: var(--vang-dam); }
.tin.cua-toi .tin-ten, .tin.he-thong .tin-ten { display: none; }
.tin-noi-dung { margin: 0; white-space: pre-wrap; }
.tin-noi-dung.thu-hoi { font-style: italic; opacity: .7; }
.don-lk { color: inherit; font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.tin.cua-ho .don-lk { color: var(--navy); }
.tin-gio { font-size: 11px; opacity: .8; justify-self: end; }
.tin.he-thong .tin-gio { opacity: 1; } /* chữ xám trên nền kem: không mờ thêm (axe color-contrast) */
.tin-trang-thai { font-size: 11px; color: var(--chu-mo); justify-self: end; min-height: 14px; display: flex; gap: 6px; align-items: center; }
.tin-trang-thai .nut-gui-lai { min-height: 28px; padding: 0 10px; border-radius: 8px; border: 1px solid var(--do); color: var(--do); background: var(--do-nhat); }
.tin-trang-thai.loi { color: var(--do); }
.tin-trang-thai:empty { display: none; }

/* Soạn */
.soan { display: flex; gap: 8px; padding: 10px 14px; background: var(--giay); border-top: 1px solid var(--vien); padding-bottom: calc(10px + env(safe-area-inset-bottom)); }
.soan textarea { flex: 1; resize: none; min-height: var(--cham); max-height: 140px; padding: 10px 12px; border: 1px solid var(--vien-dam); border-radius: 10px; }
.soan textarea:focus { outline: 2px solid var(--vang); outline-offset: 1px; }

/* Điện thoại: 1 cột, không tràn ngang */
@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; }
  .chinh { display: none; }
  .app.dang-xem .ben { display: none; }
  .app.dang-xem .chinh { display: flex; }
  .chi-mobile { display: inline-flex; align-items: center; justify-content: center; width: var(--cham); font-size: 24px; }
  .tin { max-width: 88%; }
}

/* ---------- C1.6b: tệp, ảnh, kéo thả, hộp thoại ---------- */
.nut-tep { padding: 0 10px; font-size: 18px; }
.tha-tep { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(26,46,74,.85); color: #fff; font-size: 18px; font-weight: 600; border: 3px dashed var(--vang); z-index: 5; pointer-events: none; }
.khung { position: relative; }
.tin-tep { display: grid; gap: 4px; }
.anh-lk { display: block; line-height: 0; border-radius: 10px; overflow: hidden; background: var(--vien); }
.anh-thumb { display: block; max-width: 100%; height: auto; }
.tep-the { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; align-items: center; padding: 6px 8px; border-radius: 10px; background: rgba(0,0,0,.06); color: inherit; text-decoration: none; min-width: 180px; }
.tin.cua-toi .tep-the { background: rgba(255,255,255,.14); }
.tep-the .tep-icon { grid-row: 1 / span 2; font-size: 26px; }
.tep-the .tep-ten { font-weight: 600; overflow-wrap: anywhere; }
.tep-the .tep-cu { font-size: 12px; opacity: .75; }
.tep-the .tep-tai { font-size: 12px; text-decoration: underline; }
.tin-tep progress { grid-column: 1 / -1; width: 100%; height: 6px; accent-color: var(--vang); }
.tin.cua-toi .tin-ten { display: none; }

/* Hộp thoại */
.hop { border: 1px solid var(--vien); border-radius: var(--bo); padding: 0; width: min(100% - 32px, 440px); background: var(--giay); color: var(--chu); }
.hop::backdrop, .hop-anh::backdrop { background: rgba(10,20,40,.6); }
.hop-dau, .hop-chan { display: flex; align-items: center; gap: 8px; padding: 12px 16px; }
.hop-dau { border-bottom: 1px solid var(--vien); }
.hop-dau strong { flex: 1; font-size: 17px; }
.hop-chan { border-top: 1px solid var(--vien); justify-content: flex-end; }
.hop .mo { margin: 10px 16px 0; color: var(--chu-mo); font-size: 14px; }
.hop .loi { margin: 0 16px 10px; font-size: 14px; }
.nut-nguy { border-color: var(--do); color: var(--do); }
.tv-ds, .moi-ds { list-style: none; margin: 0; padding: 8px 16px; max-height: 50vh; overflow-y: auto; display: grid; gap: 4px; }
.tv-ds li { display: flex; align-items: center; gap: 8px; min-height: var(--cham); }
.tv-ds .tv-ten { flex: 1; }
.tv-vai { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: var(--vang-nhat); color: var(--vang-dam); }
.tv-them { display: flex; gap: 8px; padding: 0 16px 12px; }
.o-chon { flex: 1; min-height: var(--cham); border: 1px solid var(--vien-dam); border-radius: 10px; padding: 0 10px; background: var(--giay); }
.moi-ds label { display: flex; align-items: center; gap: 10px; min-height: var(--cham); cursor: pointer; }
.moi-ds input { width: 20px; height: 20px; }
.moi-ds .tv-pb { color: var(--chu-mo); font-size: 13px; margin-left: auto; }
.moi-ten { display: grid; gap: 6px; padding: 8px 16px 12px; font-weight: 600; font-size: 14px; }
.moi-ten input { min-height: var(--cham); padding: 0 12px; border: 1px solid var(--vien-dam); border-radius: 10px; font-weight: 400; }

/* Xem ảnh */
.hop-anh { border: 0; padding: 0; background: transparent; max-width: 100vw; max-height: 100vh; width: 100%; height: 100%; display: grid; grid-template-rows: 1fr auto; }
.hop-anh:not([open]) { display: none; }
.hop-anh img { max-width: 100vw; max-height: calc(100vh - 64px); margin: auto; object-fit: contain; }
.hop-anh-thanh { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--navy); color: #fff; }
.hop-anh-ten { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hop-anh-thanh .nut { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); text-decoration: none; display: inline-flex; align-items: center; }

/* ---------- C1.6c: tìm tin, nổi bật, chờ mạng ---------- */
.tim { padding: 8px 10px 0; }
.tim input { width: 100%; min-height: 40px; padding: 0 12px; border: 1px solid var(--vien-dam); border-radius: 10px; background: var(--nen); }
.tim input:focus { outline: 2px solid var(--vang); outline-offset: 1px; background: var(--giay); }
.kq-tim { list-style: none; margin: 0; padding: 6px; overflow-y: auto; flex: 1; }
.kq-tim li { display: grid; gap: 2px; padding: 10px 12px; border-radius: 10px; cursor: pointer; min-height: var(--cham); }
.kq-tim li:hover { background: var(--nen); }
.kq-tim .kq-dau { display: flex; gap: 8px; font-size: 12px; color: var(--chu-mo); }
.kq-tim .kq-dau b { color: var(--vang-dam); font-weight: 700; }
.kq-tim .kq-dau span:last-child { margin-left: auto; }
.kq-tim .kq-noi-dung { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kq-tim mark { background: var(--vang-nhat); color: var(--vang-dam); border-radius: 3px; padding: 0 1px; }
.tin.noi-bat .bong { outline: 3px solid var(--vang); transition: outline-color 1.5s; }

/* ---------- C3.2: banner bật thông báo ---------- */
.banner-push { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 8px 12px; background: var(--vang-nhat); color: var(--vang-dam); font-size: 13px; border-bottom: 1px solid var(--vien); }
.banner-push span { flex: 1 1 160px; }