/* ══════════════════════════════════════════════════════════════════════════
   Bài tập của lớp — giao diện
   Ưu tiên điện thoại: link thả vào nhóm Zalo nên gần như ai cũng mở bằng
   điện thoại. Điều hướng nằm ở ĐÁY màn hình cho ngón cái với tới;
   từ 720px trở lên mới chuyển lên đầu trang.
   ══════════════════════════════════════════════════════════════════════════ */

:root {
    --paper:#faf7f2;  --card:#fffefb;  --raise:#fff;
    --ink:#241f1a;    --ink-2:#5c5249; --muted:#8f8478;
    --line:#e9e0d3;   --line-2:#f2ece1;
    --brand:#c9683c;  --brand-soft:#f5e3d8;
    --ok:#3f8a68;     --warn:#c9922f;  --late:#c0503f;
    --sh-1:0 1px 2px rgba(36,31,26,.05);
    --sh-2:0 2px 10px rgba(36,31,26,.07);
    --sh-3:0 8px 28px rgba(36,31,26,.13);
    --r:14px; --r-lg:20px;
}
@media (prefers-color-scheme: dark) {
    :root {
        --paper:#141110;  --card:#1c1917;  --raise:#242019;
        --ink:#f2ece4;    --ink-2:#c4b8ab; --muted:#8f8378;
        --line:#2c2621;   --line-2:#221d19;
        --brand:#e08a5c;  --brand-soft:#33231a;
        --ok:#5cb28c;     --warn:#dfae52;  --late:#e07260;
        --sh-1:0 1px 2px rgba(0,0,0,.3);
        --sh-2:0 2px 10px rgba(0,0,0,.32);
        --sh-3:0 8px 28px rgba(0,0,0,.45);
    }
}

* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; }
body {
    margin:0; background:var(--paper); color:var(--ink);
    font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
    letter-spacing:-.01em;
    padding-bottom:calc(78px + env(safe-area-inset-bottom));
}
@media (min-width:720px) { body { padding-bottom:48px; } }
.wrap { width:100%; max-width:760px; margin:0 auto; padding:0 16px; }
h1,h2,h3 { letter-spacing:-.02em; }

/* ── Thương hiệu + đầu trang ─────────────────────────────────────────── */
.top {
    background:var(--card); border-bottom:1px solid var(--line);
    padding-top:env(safe-area-inset-top);
}
.top .wrap { display:flex; align-items:center; gap:12px; padding-block:13px; }
.brand { display:flex; align-items:center; gap:10px; min-width:0; flex:1; }
.mark {
    width:36px; height:36px; border-radius:11px; flex:none;
    background:linear-gradient(145deg, var(--brand), color-mix(in srgb, var(--brand) 72%, #000));
    display:grid; place-items:center; box-shadow:var(--sh-1);
}
.mark::after { content:""; width:11px; height:11px; border-radius:50%; background:var(--card); }
.mark.admin { background:linear-gradient(145deg, var(--muted), var(--ink-2)); }
.brand > div { min-width:0; }
.wordmark {
    font-size:11px; font-weight:800; letter-spacing:.14em; text-transform:uppercase;
    color:var(--brand); margin:0 0 1px; line-height:1;
}
h1 {
    font-size:16px; margin:0; line-height:1.25; font-weight:650;
    overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.tagline {
    margin:1px 0 0; font-size:13px; color:var(--muted);
    overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}

/* ── Điều hướng: đáy màn trên điện thoại, đầu trang trên màn rộng ────── */
.tabs {
    position:fixed; left:0; right:0; bottom:0; z-index:30;
    background:color-mix(in srgb, var(--card) 92%, transparent);
    backdrop-filter:saturate(1.6) blur(14px);
    border-top:1px solid var(--line);
    padding-bottom:env(safe-area-inset-bottom);
}
.tabs .wrap { display:flex; gap:2px; padding:0 6px; }
.tab {
    flex:1; background:none; border:0; cursor:pointer; padding:9px 2px 8px;
    display:flex; flex-direction:column; align-items:center; gap:3px;
    color:var(--muted); font:inherit; font-size:11px; font-weight:600;
    border-radius:12px; transition:color .15s;
}
.tab b { font-weight:400; font-size:20px; line-height:1; filter:grayscale(1); opacity:.55; transition:.15s; }
.tab.on { color:var(--brand); }
.tab.on b { filter:none; opacity:1; transform:translateY(-1px); }
.tab:active { background:var(--line-2); }

@media (min-width:720px) {
    .tabs {
        position:sticky; top:0; bottom:auto; border-top:0;
        border-bottom:1px solid var(--line); padding-bottom:0;
    }
    .tabs .wrap { gap:4px; padding-inline:16px; }
    .tab {
        flex:none; flex-direction:row; gap:7px; font-size:15px; padding:14px 15px;
        border-radius:0; border-bottom:2px solid transparent;
    }
    .tab b { font-size:16px; }
    .tab.on { border-bottom-color:var(--brand); }
    .tab:active { background:none; }
}

main { padding-top:20px; }
.pane { display:none; animation:rise .22s ease both; }
.pane.on { display:block; }
@keyframes rise { from { opacity:0; transform:translateY(6px); } }

/* ── Thẻ ─────────────────────────────────────────────────────────────── */
.card {
    background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg);
    padding:20px; margin-bottom:14px; box-shadow:var(--sh-1);
}
.card h2 { font-size:19px; margin:0 0 7px; font-weight:650; }
.card h3 {
    font-size:12px; margin:20px 0 8px; color:var(--muted); font-weight:700;
    text-transform:uppercase; letter-spacing:.07em;
}
.card.soon { border-style:dashed; background:none; }
.card.soon h2 { font-size:15px; color:var(--muted); }
.card.editing { border-color:var(--brand); box-shadow:0 0 0 3px var(--brand-soft); }

.day-tag {
    display:inline-block; background:var(--brand); color:#fff; font-size:11px;
    font-weight:800; padding:4px 11px; border-radius:99px; margin-bottom:11px;
    letter-spacing:.09em;
}
.brief { white-space:pre-wrap; margin:0; color:var(--ink-2); }
.reqs { margin:8px 0 0; padding-left:19px; color:var(--ink-2); font-size:15px; }
.reqs li { margin-bottom:4px; }
.hint { color:var(--muted); font-size:14px; margin:0 0 12px; line-height:1.55; }
.err { color:var(--late); font-size:14px; margin:10px 0 0; min-height:1em; }
.opt { font-weight:400; color:var(--muted); font-size:12px; text-transform:none; letter-spacing:0; }
.empty {
    color:var(--muted); text-align:center; padding:52px 22px; font-size:15px;
    border:1px dashed var(--line); border-radius:var(--r-lg);
}

/* ── Ô nhập ──────────────────────────────────────────────────────────── */
.field {
    width:100%; background:var(--paper); border:1px solid var(--line);
    border-radius:var(--r); padding:13px 15px; font:inherit; color:var(--ink);
    margin-bottom:10px; -webkit-appearance:none; appearance:none; transition:.14s;
}
.field::placeholder { color:var(--muted); }
.field:focus {
    outline:none; border-color:var(--brand); background:var(--card);
    box-shadow:0 0 0 3px var(--brand-soft);
}
textarea.field { min-height:190px; resize:vertical; line-height:1.72; }
.counter { text-align:right; font-size:13px; color:var(--muted); margin:-4px 0 12px; font-variant-numeric:tabular-nums; }

button { font:inherit; cursor:pointer; }
.primary {
    background:var(--brand); color:#fff; border:0; border-radius:var(--r);
    padding:14px 24px; font-weight:650; font-size:16px; box-shadow:var(--sh-1);
    transition:.14s;
}
.primary:hover { filter:brightness(1.06); }
.primary:active { transform:translateY(1px); }
.primary:disabled { opacity:.45; cursor:not-allowed; transform:none; }
.primary.sm { padding:11px 18px; font-size:15px; flex:none; }
.ghost {
    background:none; border:1px solid var(--line); color:var(--ink-2);
    border-radius:var(--r); padding:11px 16px; font-size:14px;
    text-decoration:none; display:inline-block; transition:.14s;
}
.ghost:hover { border-color:var(--muted); color:var(--ink); }
.ghost.danger { border-color:color-mix(in srgb, var(--late) 35%, var(--line)); color:var(--late); }
.ghost.danger:hover { background:color-mix(in srgb, var(--late) 9%, transparent); }
.row-controls { display:flex; gap:9px; margin-bottom:16px; flex-wrap:wrap; }
.row-controls .field { margin:0; flex:1 1 190px; }
.split { display:flex; gap:10px; align-items:center; flex-wrap:wrap; }

/* ── Chủ đề ──────────────────────────────────────────────────────────── */
.topic {
    --s:68%;
    display:inline-flex; align-items:center; gap:5px; white-space:nowrap;
    font-size:12.5px; padding:5px 11px; border-radius:99px; font-weight:550;
    border:1px solid hsl(var(--h) var(--s) 50% / .3);
    color:hsl(var(--h) var(--s) 36%);
    background:hsl(var(--h) var(--s) 50% / .07);
}
@media (prefers-color-scheme: dark) { .topic { color:hsl(var(--h) var(--s) 74%); } }
.topic.sm { font-size:11.5px; padding:3px 9px; margin-left:auto; }
.topic-pick { display:flex; flex-wrap:wrap; gap:8px; margin:0 0 14px; }
.topic-pick.filters { margin-bottom:18px; }
.topic.pick, .topic.filter { cursor:pointer; font-size:14px; padding:8px 14px; transition:.14s; }
.topic.pick:hover, .topic.filter:hover { border-color:hsl(var(--h) var(--s) 50% / .7); }
.topic.pick.on, .topic.filter.on {
    background:hsl(var(--h) var(--s) 46%); color:#fff;
    border-color:transparent; font-weight:650;
}

/* ── Bài nộp ─────────────────────────────────────────────────────────── */
.sub {
    background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg);
    padding:18px 20px; margin-bottom:12px; box-shadow:var(--sh-1);
}
.sub.mine { border-color:var(--brand); box-shadow:0 0 0 2px var(--brand-soft); }
.sub-head { display:flex; align-items:center; gap:9px; margin-bottom:10px; flex-wrap:wrap; }
.who { font-weight:650; }
.when, .words { font-size:12.5px; color:var(--muted); }
.badge-me {
    background:var(--brand); color:#fff; font-size:10px; font-weight:800;
    padding:3px 8px; border-radius:99px; letter-spacing:.05em;
}
.sub-text { white-space:pre-wrap; margin:0; color:var(--ink-2); line-height:1.72; }
.sub-text.clip { display:-webkit-box; -webkit-line-clamp:5; -webkit-box-orient:vertical; overflow:hidden; }
.more { background:none; border:0; color:var(--brand); padding:7px 0 0; font-size:14px; font-weight:600; }
.sub-link {
    display:inline-block; margin-top:10px; color:var(--brand);
    word-break:break-all; font-size:14.5px;
}
.authornote {
    margin:12px 0 0; padding:10px 14px; border-radius:12px;
    background:var(--paper); border:1px dashed var(--line);
    font-size:14px; color:var(--ink-2);
}
.locked { color:var(--muted); font-style:italic; margin:0; }
.sub-foot {
    display:flex; gap:8px; align-items:center; margin-top:14px;
    flex-wrap:wrap; padding-top:12px; border-top:1px solid var(--line-2);
}
.heart {
    background:none; border:1px solid var(--line); border-radius:99px;
    padding:7px 14px; font-size:13.5px; color:var(--muted); transition:.14s;
}
.heart:hover { border-color:var(--muted); color:var(--ink); }
.heart.on { border-color:var(--brand); color:var(--brand); background:var(--brand-soft); }
.heart.edit { margin-left:auto; }
@keyframes flash { 0%,100% { box-shadow:var(--sh-1); } 30% { box-shadow:0 0 0 3px var(--brand); } }
.sub.flash { animation:flash 1.5s ease; }

/* ── Nhận xét ────────────────────────────────────────────────────────── */
.cmt-box { margin-top:14px; padding-top:14px; border-top:1px solid var(--line-2); }
.cmt-box[hidden] { display:none; }
.cmt-list { margin-bottom:12px; }
.cmt { padding:11px 0; border-bottom:1px solid var(--line-2); }
.cmt:last-child { border-bottom:0; }
.cmt-head { display:flex; align-items:center; gap:8px; margin-bottom:4px; flex-wrap:wrap; }
.cmt-head b { font-size:14px; font-weight:650; }
.cmt p { margin:0; font-size:15px; white-space:pre-wrap; color:var(--ink-2); }
.cmt-del { margin-left:auto; background:none; border:0; color:var(--muted); font-size:13px; padding:0; }
.cmt-del:hover { color:var(--late); }
.cmt.teacher {
    background:color-mix(in srgb, var(--ok) 7%, transparent);
    border-left:3px solid var(--ok); border-bottom:0;
    padding:12px 14px; margin:8px 0; border-radius:0 12px 12px 0;
}
.badge-teacher {
    background:var(--ok); color:#fff; font-size:10px; font-weight:800;
    padding:3px 8px; border-radius:99px; letter-spacing:.05em;
}
.cmt-form { display:flex; gap:8px; align-items:flex-end; }
.cmt-input { margin:0; min-height:46px; resize:none; font-size:15px; }

/* ── Thống kê ────────────────────────────────────────────────────────── */
.stat-row { display:flex; gap:10px; margin-bottom:14px; flex-wrap:wrap; }
.stat {
    flex:1 1 88px; background:var(--card); border:1px solid var(--line);
    border-radius:var(--r); padding:15px 10px; text-align:center; box-shadow:var(--sh-1);
}
.stat b { display:block; font-size:25px; line-height:1.15; font-weight:700; font-variant-numeric:tabular-nums; }
.stat span { font-size:12px; color:var(--muted); }
.bar { height:8px; background:var(--line); border-radius:99px; overflow:hidden; margin-bottom:20px; }
.bar i {
    display:block; height:100%; border-radius:99px;
    background:linear-gradient(90deg, var(--brand), color-mix(in srgb, var(--brand) 62%, var(--warn)));
    transition:width .5s cubic-bezier(.4,0,.2,1);
}

.plist { list-style:none; margin:0; padding:0; }
.pitem {
    display:flex; align-items:center; gap:12px; padding:14px 16px;
    background:var(--card); border:1px solid var(--line); border-radius:var(--r);
    margin-bottom:8px; cursor:pointer; transition:.14s;
}
.pitem:hover { border-color:var(--muted); transform:translateX(2px); }
.pitem:active { transform:scale(.99); }
.pitem .icon { font-size:16px; width:24px; height:24px; flex:none; display:grid; place-items:center; border-radius:50%; }
.pitem.done .icon { background:color-mix(in srgb, var(--ok) 15%, transparent); color:var(--ok); }
.pitem.late .icon { background:color-mix(in srgb, var(--late) 15%, transparent); color:var(--late); }
.pitem.open .icon { background:var(--line-2); color:var(--muted); }
.pitem .txt { flex:1; min-width:0; }
.pitem .txt b { display:block; font-size:15px; font-weight:650; }
.pitem .txt span { font-size:12.5px; color:var(--muted); }
.pitem .go { color:var(--muted); font-size:16px; flex:none; }
.pitem.open .go, .pitem.late .go {
    font-size:12.5px; font-weight:600; border:1px solid var(--line);
    border-radius:99px; padding:5px 12px; color:var(--brand);
}
.pitem.done { border-color:color-mix(in srgb, var(--ok) 30%, var(--line)); }
.pitem.late { border-color:color-mix(in srgb, var(--late) 30%, var(--line)); }
.pitem.on { border-color:var(--brand); box-shadow:0 0 0 2px var(--brand-soft); }
.pitem .txt[data-edit] { cursor:pointer; }

.roster { display:flex; flex-wrap:wrap; gap:7px; margin-top:10px; }
.chip {
    font-size:13px; padding:6px 12px; border-radius:99px;
    border:1px solid var(--line); color:var(--muted);
}
.chip.yes { border-color:color-mix(in srgb, var(--ok) 40%, var(--line)); color:var(--ok); }

/* ── Thi đua ─────────────────────────────────────────────────────────── */
.lb { list-style:none; margin:0; padding:0; }
.lb-row { display:flex; align-items:center; gap:12px; padding:13px 0; border-bottom:1px solid var(--line-2); }
.lb-row:last-child { border-bottom:0; }
.lb-row.mine {
    background:var(--brand-soft); border-radius:var(--r);
    padding-inline:13px; border-bottom-color:transparent;
}
.lb-rank { font-size:18px; width:32px; text-align:center; flex:none; font-variant-numeric:tabular-nums; font-weight:700; }
.lb-who { flex:1; min-width:0; }
.lb-who b { display:block; font-size:15px; font-weight:650; }
.lb-who span { font-size:12px; color:var(--muted); }
.lb-score { font-size:18px; font-weight:750; font-variant-numeric:tabular-nums; color:var(--brand); flex:none; }
.lb-score .ok { color:var(--ok); font-style:normal; font-size:14px; }
.nums { margin:10px 0 0; font-size:14px; color:var(--muted); font-variant-numeric:tabular-nums; }
.nums b { color:var(--ink); }
.num-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-bottom:6px; }
.num-grid label { font-size:12.5px; color:var(--muted); display:block; font-weight:600; }
.num-grid .field { margin:5px 0 0; font-variant-numeric:tabular-nums; }
.con-thumb {
    width:100%; max-height:180px; object-fit:cover; border-radius:var(--r);
    margin-bottom:11px; border:1px solid var(--line);
}
.verified { color:var(--ok); font-size:13px; font-weight:650; }
.badge-wait {
    background:var(--line); color:var(--muted); font-size:10px; font-weight:800;
    padding:3px 8px; border-radius:99px; letter-spacing:.04em;
}
.pitem .badge-wait { margin-left:7px; vertical-align:middle; }

/* ── Hộp thoại ───────────────────────────────────────────────────────── */
.sheet {
    position:fixed; inset:0; background:rgba(20,17,16,.5); z-index:60;
    display:flex; align-items:flex-end; justify-content:center;
    padding:0 10px calc(10px + env(safe-area-inset-bottom));
    backdrop-filter:blur(3px); animation:fade .18s ease;
}
@keyframes fade { from { opacity:0; } }
@media (min-width:600px) { .sheet { align-items:center; padding-bottom:10px; } }
.sheet[hidden], .toast[hidden] { display:none; }
.sheet-card {
    background:var(--card); border-radius:var(--r-lg); padding:24px;
    width:100%; max-width:440px; box-shadow:var(--sh-3);
    animation:slideup .24s cubic-bezier(.2,.8,.2,1) both;
}
@keyframes slideup { from { transform:translateY(18px); opacity:0; } }
.sheet-card.wide { max-width:580px; max-height:88dvh; overflow-y:auto; }
.sheet-card h2 { margin:0 0 6px; font-size:20px; font-weight:700; }
.sheet-actions { display:flex; gap:10px; justify-content:flex-end; margin-top:8px; flex-wrap:wrap; }
.edit-asg { font-weight:650; margin:0 0 4px; color:var(--ink-2); }

.toast {
    position:fixed; left:50%; bottom:calc(94px + env(safe-area-inset-bottom));
    transform:translateX(-50%); background:var(--ink); color:var(--paper);
    padding:12px 22px; border-radius:99px; font-size:14.5px; font-weight:550; z-index:70;
    box-shadow:var(--sh-3); max-width:calc(100% - 32px);
    animation:slideup .2s ease both;
}
@media (min-width:720px) { .toast { bottom:26px; } }

/* ── Chân trang ──────────────────────────────────────────────────────── */
.foot { text-align:center; padding:36px 16px 16px; }
.foot a { color:var(--muted); font-size:13px; text-decoration:none; }
.foot a:hover { color:var(--brand); }
.foot .by { font-size:11px; color:var(--muted); margin-top:8px; letter-spacing:.1em; text-transform:uppercase; }
.foot .by b { color:var(--brand); font-weight:800; }

/* Thẻ link — có tiêu đề và đoạn trích thì đọc dễ hơn URL trần */
.linkcard {
    display:block; margin-top:12px; padding:13px 15px; border-radius:var(--r);
    background:var(--paper); border:1px solid var(--line); text-decoration:none;
    transition:.14s;
}
.linkcard:hover { border-color:var(--brand); }
.linkcard b { display:block; color:var(--ink); font-size:14.5px; font-weight:650; margin-bottom:3px; }
.linkcard span { display:block; color:var(--muted); font-size:13px; line-height:1.55; margin-bottom:5px; }
.linkcard i {
    display:block; color:var(--brand); font-style:normal; font-size:12px;
    overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}

/* Dòng xem trước dưới ô dán link */
.lp {
    display:block; font-size:13px; color:var(--muted); line-height:1.5;
    padding:9px 13px; background:var(--paper); border:1px solid var(--line);
    border-radius:12px; margin-bottom:8px;
}
.lp.ok { border-color:color-mix(in srgb, var(--ok) 40%, var(--line)); }
.lp b { display:block; color:var(--ink); font-size:14px; font-weight:650; }
.lp i {
    font-style:normal; font-size:12px; color:var(--muted);
    margin-right:9px; display:inline-block; margin-top:3px;
}
.lp.ok b::before { content:"✓ "; color:var(--ok); }

/* Đề bài dài thì thu gọn */
.clip-brief { display:-webkit-box; -webkit-line-clamp:6; -webkit-box-orient:vertical; overflow:hidden; }

/* ── Form nhiều nhóm (trang quản lý) ──────────────────────────────────── */
.form-head { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:4px; }
.form-head h2 { margin:0; }

.fs {
    border:1px solid var(--line); border-radius:var(--r); padding:16px;
    margin:0 0 16px; background:var(--paper);
}
.fs legend {
    font-size:11px; font-weight:800; text-transform:uppercase; letter-spacing:.09em;
    color:var(--muted); padding:0 8px; margin-left:-4px;
}
.lb {
    display:block; font-size:12.5px; font-weight:650; color:var(--ink-2);
    margin-bottom:12px;
}
.lb .field { margin:6px 0 0; }
.lb textarea.field { min-height:96px; }
.grid-2 { display:grid; grid-template-columns:96px 1fr; gap:10px; }
.grid-2 .lb { margin-bottom:12px; }

/* Nút chọn nhanh ngày giờ — gõ tay datetime trên điện thoại rất khổ */
.quick { display:flex; flex-wrap:wrap; gap:7px; margin:8px 0 9px; }
.quick button {
    background:var(--card); border:1px solid var(--line); color:var(--ink-2);
    border-radius:99px; padding:7px 13px; font-size:13px; font-weight:600;
    transition:.14s;
}
.quick button:hover { border-color:var(--brand); color:var(--brand); }
.quick button:active { background:var(--brand-soft); }

.when-say { font-size:13px; color:var(--brand); margin:2px 0 0; font-weight:600; }
.primary.block { width:100%; }

/* ── Ô chọn ngày kiểu tăng/giảm ───────────────────────────────────────── */
.stepper { display:flex; align-items:center; gap:0; margin-top:6px; }
.stepper button {
    width:44px; height:46px; flex:none; background:var(--card);
    border:1px solid var(--line); color:var(--ink-2); font-size:19px; font-weight:600;
    transition:.14s;
}
.stepper button:first-of-type { border-radius:var(--r) 0 0 var(--r); }
.stepper button:last-of-type  { border-radius:0 var(--r) var(--r) 0; }
.stepper button:hover  { border-color:var(--brand); color:var(--brand); }
.stepper button:active { background:var(--brand-soft); }
.stepper input {
    width:66px; height:46px; flex:none; text-align:center; border:1px solid var(--line);
    border-inline:0; background:var(--paper); color:var(--ink);
    font:inherit; font-size:17px; font-weight:700; font-variant-numeric:tabular-nums;
    -moz-appearance:textfield; appearance:textfield;
}
.stepper input::-webkit-outer-spin-button,
.stepper input::-webkit-inner-spin-button { -webkit-appearance:none; margin:0; }
.stepper input:focus { outline:none; box-shadow:0 0 0 3px var(--brand-soft); position:relative; z-index:1; }
.stepper-say { font-size:13px; margin-left:12px; color:var(--muted); }
.stepper-say.warn { color:var(--warn); font-weight:600; }

/* ── Ô soạn có thanh công cụ ──────────────────────────────────────────── */
.editor { border:1px solid var(--line); border-radius:var(--r); overflow:hidden; background:var(--card); margin-top:6px; }
.ed-bar {
    display:flex; align-items:center; gap:7px; flex-wrap:wrap;
    padding:8px 10px; background:var(--paper); border-bottom:1px solid var(--line);
}
.ed-bar button {
    background:var(--card); border:1px solid var(--line); color:var(--ink-2);
    border-radius:8px; padding:6px 11px; font-size:13px; font-weight:600; transition:.14s;
}
.ed-bar button:hover { border-color:var(--brand); color:var(--brand); }
.ed-help { font-size:11.5px; color:var(--muted); margin-left:auto; }
.ed-help b { color:var(--brand); font-family:ui-monospace,SFMono-Regular,Menlo,monospace; }
.editor .field { border:0; border-radius:0; margin:0; background:var(--card); }
.editor .field:focus { box-shadow:none; }

/* ── Xem trước ────────────────────────────────────────────────────────── */
.preview {
    margin-top:12px; padding:16px; border:1px dashed var(--line);
    border-radius:var(--r); background:var(--paper);
}
.pv-tag {
    display:inline-block; font-size:10px; font-weight:800; letter-spacing:.1em;
    color:var(--muted); text-transform:uppercase; margin-bottom:8px;
}
.pv-title { display:block; font-size:18px; font-weight:650; margin-bottom:6px; }
.pv-brief { white-space:pre-wrap; margin:0; color:var(--ink-2); font-size:15px; }
.pv-reqs { margin:10px 0 0; padding-left:19px; color:var(--ink-2); font-size:14.5px; }
.pv-reqs li { margin-bottom:3px; }

/* ── Nội dung Markdown ────────────────────────────────────────────────── */
.md { color:var(--ink-2); line-height:1.72; }
.md > *:first-child { margin-top:0; }
.md > *:last-child  { margin-bottom:0; }
.md h3, .md h4, .md h5, .md h6 {
    color:var(--ink); font-weight:650; margin:20px 0 8px; line-height:1.35;
    text-transform:none; letter-spacing:-.01em;
}
.md h3 { font-size:17px; }
.md h4 { font-size:15.5px; }
.md h5, .md h6 { font-size:14.5px; color:var(--ink-2); }
.md p { margin:0 0 12px; }
.md ul, .md ol { margin:0 0 12px; padding-left:22px; }
.md li { margin-bottom:5px; }
.md li::marker { color:var(--muted); }
.md ol > li::marker { font-weight:650; color:var(--brand); }
.md strong { color:var(--ink); font-weight:650; }
.md a { color:var(--brand); word-break:break-word; }
.md code {
    background:var(--paper); border:1px solid var(--line); border-radius:5px;
    padding:1px 5px; font-size:.9em; font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
}
.md blockquote {
    margin:0 0 12px; padding:2px 0 2px 14px;
    border-left:3px solid var(--line); color:var(--muted);
}
.md hr { border:0; border-top:1px solid var(--line); margin:18px 0; }
.md .clip, .clip-brief.md { overflow:hidden; }

/* Đầu hộp thoại có nút đóng — không phải cuộn xuống cuối mới thoát được */
.sheet-head { display:flex; align-items:flex-start; gap:12px; margin-bottom:6px; }
.sheet-head h2 { flex:1; margin:0; }
.sheet-x {
    flex:none; width:34px; height:34px; margin:-4px -4px 0 0;
    background:none; border:0; border-radius:50%;
    color:var(--muted); font-size:26px; line-height:1; transition:.14s;
}
.sheet-x:hover { background:var(--line-2); color:var(--ink); }
.pitem.flash { animation:flash 1.5s ease; }

/* Bảng lịch: sửa và mở từng ngày ngay tại chỗ */
.pitem.sch { gap:8px; }
.pitem.ghosted { opacity:.55; border-style:dashed; }
.ghost.sm { padding:6px 11px; font-size:12.5px; flex:none; }
.txt .off { font-style:normal; color:var(--warn); font-weight:600; }
.inline-when {
    display:flex; gap:8px; align-items:center; flex-wrap:wrap;
    margin:-4px 0 10px; padding:12px 14px;
    background:var(--paper); border:1px solid var(--brand); border-radius:var(--r);
}
.inline-when .field { margin:0; flex:1 1 190px; }

/* Chữ gợi ý nhỏ hơn chữ nhập, để không bị cắt trên màn hẹp */
.field::placeholder { font-size:14px; opacity:.75; }
textarea.field::placeholder { font-size:15px; }

/* Đang đọc link: có chấm nhấp nháy cho biết máy đang làm việc */
.lp.loading::after {
    content:""; display:inline-block; width:6px; height:6px; margin-left:7px;
    border-radius:50%; background:var(--brand); animation:pulse 1s ease-in-out infinite;
    vertical-align:middle;
}
@keyframes pulse { 0%,100% { opacity:.25; } 50% { opacity:1; } }

/* Chữ link cạnh tên ở bảng thi đua */
.lb-link {
    font-size:12px; font-weight:600; color:var(--brand); text-decoration:none;
    border:1px solid color-mix(in srgb, var(--brand) 35%, var(--line));
    border-radius:99px; padding:2px 9px; margin-left:6px;
    white-space:nowrap; vertical-align:middle;
}
.lb-link:hover { background:var(--brand-soft); }

/* Nhãn nền tảng trên thẻ link — cho biết bấm vào sẽ đi đâu */
.lc-tag {
    display:inline-block; font-size:11px; font-weight:800; letter-spacing:.05em;
    color:var(--brand); background:var(--brand-soft);
    padding:2px 9px; border-radius:99px; margin-bottom:6px;
}

/* Số điện thoại học viên — chỉ hiện ở trang quản lý, bấm là chép */
.phone {
    flex:none; background:var(--paper); border:1px solid var(--line);
    color:var(--ink-2); border-radius:8px; padding:6px 11px;
    font-size:13px; font-weight:600; font-variant-numeric:tabular-nums;
    letter-spacing:.02em; transition:.14s;
}
.phone:hover { border-color:var(--brand); color:var(--brand); }
.phone.big { font-size:14.5px; padding:7px 13px; margin-top:6px; }
.form-head > div { min-width:0; }
.foot .dot { color:var(--line); margin:0 8px; }