/* ===== Màu sắc và chế độ sáng/tối ===== */
:root{
  --bg:#F6F8EE; --surface:#FFFFFF; --ink:#22301A; --muted:#67715B; --line:#DBE2CA;
  --skin:#3E5B2B; --skin-ink:#FFFFFF; --flesh:#E2EAAC; --flesh-soft:#EFF3D5; --pit:#8A5530;
  --ok:#3E7A2E; --late:#9C7210; --exc:#3F6E8C; --abs:#B0412C;
  color-scheme:light;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#13180E; --surface:#1B2214; --ink:#E6ECD6; --muted:#9AA48A; --line:#2F3925;
    --skin:#9CBF6A; --skin-ink:#14200A; --flesh:#3A4720; --flesh-soft:#222B17; --pit:#D9A06E;
    --ok:#8CC46A; --late:#E0B348; --exc:#7FB0D0; --abs:#E57A63; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#13180E; --surface:#1B2214; --ink:#E6ECD6; --muted:#9AA48A; --line:#2F3925;
  --skin:#9CBF6A; --skin-ink:#14200A; --flesh:#3A4720; --flesh-soft:#222B17; --pit:#D9A06E;
  --ok:#8CC46A; --late:#E0B348; --exc:#7FB0D0; --abs:#E57A63; color-scheme:dark;
}

/* ===== Nền tảng ===== */
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:15px;line-height:1.5}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--skin);outline-offset:2px}
.muted{color:var(--muted)}

/* ===== Khung trang ===== */
.app{display:grid;grid-template-columns:232px 1fr;min-height:100vh}
nav.side{border-right:1px solid var(--line);padding:24px 16px;position:sticky;top:env(safe-area-inset-top,0px);height:100vh;display:flex;flex-direction:column;gap:4px}
.brand{display:flex;align-items:center;gap:10px;padding:0 8px 22px}
.brand b{font-size:19px;font-weight:800;letter-spacing:-.01em}
.brand small{display:block;color:var(--muted);font-size:12px;margin-top:-3px}
.nav{position:relative;display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;border:0;background:none;cursor:pointer;text-align:left;color:var(--muted);font-weight:500}
.nav svg{width:19px;height:19px;flex:none}
.nav:hover{background:var(--flesh-soft);color:var(--ink)}
.nav.on{background:var(--flesh);color:var(--ink);font-weight:700}
.badge{margin-left:auto;min-width:20px;height:20px;padding:0 6px;border-radius:10px;background:var(--pit);color:#fff;font-size:11px;font-style:normal;font-weight:700;display:grid;place-items:center}
.save{margin-top:auto;font-size:12px;color:var(--muted);padding:8px 12px}
main{padding:32px clamp(16px,4vw,48px) 64px;max-width:1080px;width:100%}
.vh{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:24px}
.vh h1{margin:0;font-size:clamp(26px,3.4vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.15}
.sub{margin:4px 0 0;color:var(--muted)}
h2{font-size:17px;margin:32px 0 12px;font-weight:700}

/* ===== Nút ===== */
.btn{border:1px solid var(--line);background:var(--surface);padding:8px 14px;border-radius:10px;cursor:pointer;font-weight:600;white-space:nowrap}
.btn:hover{border-color:var(--skin)}
.btn.pri{background:var(--skin);color:var(--skin-ink);border-color:var(--skin)}
.btn.pri:hover{filter:brightness(1.08)}
.btn.warm{background:var(--pit);color:#fff;border-color:var(--pit)}
.btn.sm{padding:5px 11px;font-size:13px;border-radius:8px}
.btn.ghost{border-color:transparent;background:none}
.btn.ghost:hover{background:var(--flesh-soft)}
.btn.danger{color:var(--abs)}
.btn.red{background:var(--abs);border-color:var(--abs);color:#fff}
.row-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px}

/* ===== Buổi học ===== */
.sess{display:grid;grid-template-columns:118px 1fr auto;gap:12px;align-items:center;padding:12px 16px;border-left:4px solid var(--c);background:var(--surface);border-radius:4px 12px 12px 4px;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.sess + .sess{margin-top:8px}
.sess .st{font-weight:600;font-variant-numeric:tabular-nums;display:flex;flex-direction:column;line-height:1.3}
.sess .sd{font-size:12px;color:var(--muted);font-weight:500}
.sess .sm{display:flex;flex-direction:column;min-width:0}
.sess .sm span{font-size:13px}
.sess.off{border-left-style:dashed;background:var(--bg)}
.sess.off b{text-decoration:line-through;text-decoration-color:var(--muted)}
.sess.off .why{color:var(--abs)}
.sa{display:flex;gap:6px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.num{font-size:12px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}

/* ===== Thanh band: điểm nhấn chính ===== */
.band{display:flex;align-items:center;gap:12px;min-width:0}
.track{position:relative;height:8px;flex:1;min-width:90px;max-width:180px;border-radius:8px;background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 20%),var(--flesh-soft)}
.gap{position:absolute;top:0;height:8px;background:var(--flesh);border-radius:8px}
.dot{position:absolute;top:50%;width:14px;height:14px;border-radius:50%;transform:translate(-50%,-50%);border:2px solid var(--surface)}
.dot.cur{background:var(--skin)}
.dot.tgt{background:var(--pit);width:18px;height:18px}
.bandnums{font-variant-numeric:tabular-nums;white-space:nowrap;font-size:14px}
.bandnums .t{color:var(--pit)}
.band-big .track{height:12px;max-width:none}
.band-big .gap{height:12px}
.band-big .dot{width:20px;height:20px}.band-big .dot.tgt{width:26px;height:26px}
.band-big .bandnums{font-size:22px;font-weight:800}
.scale-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:6px;font-variant-numeric:tabular-nums}

/* ===== Tiến độ khóa và học phí ===== */
.prog{display:flex;align-items:center;gap:10px;font-size:13px;font-variant-numeric:tabular-nums}
.prog .pbar{width:160px;height:8px;border-radius:8px;background:var(--flesh-soft);border:1px solid var(--line);overflow:hidden}
.prog .pbar i{display:block;height:100%;background:var(--c,var(--skin))}
.fee{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums;white-space:nowrap}
.fbar{width:56px;height:6px;border-radius:6px;background:var(--flesh-soft);border:1px solid var(--line);overflow:hidden}
.fbar i{display:block;height:100%;background:var(--skin)}
.fee.due{color:var(--pit)}
.fee.due .fbar i{background:var(--pit)}
.duebox{border-left:5px solid var(--pit);margin-bottom:8px}
.duebox .dh{padding:14px 18px 4px;font-weight:700}
.duebox .dh span{font-weight:400;color:var(--muted);font-size:13px;display:block}

/* ===== Danh sách ===== */
.list{display:flex;flex-direction:column}
.lrow{display:grid;grid-template-columns:minmax(140px,1.4fr) minmax(110px,1fr) minmax(200px,1.6fr) 96px 84px;gap:14px;align-items:center;padding:12px 16px;border-top:1px solid var(--line);cursor:pointer;background:none;border-left:0;border-right:0;border-bottom:0;text-align:left;width:100%}
.lrow:first-child{border-top:0}
.lrow:hover{background:var(--flesh-soft)}
.lhead{cursor:default;font-size:12px;color:var(--muted);font-weight:600}
.lhead:hover{background:none}
.lrow.static{cursor:default}
.lrow.static:hover{background:none}
.name{font-weight:600}
.chips{display:flex;flex-wrap:wrap;gap:4px}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:12px;padding:2px 9px;border-radius:20px;background:var(--flesh-soft);border:1px solid var(--line);white-space:nowrap}
.chip i{width:8px;height:8px;border-radius:50%;background:var(--c)}
.rate{font-variant-numeric:tabular-nums;font-weight:600}
.rate.low{color:var(--abs)}

/* ===== Khối lớp ===== */
.cls{border-left:6px solid var(--c);margin-bottom:18px}
.cls-h{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:flex-start;padding:18px 20px 14px}
.cls-h h3{margin:0;font-size:20px;font-weight:800}
.cls-meta{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px;color:var(--muted);margin-top:4px}
.cls-meta b{color:var(--ink);font-weight:600}
.cls .prog{margin-top:10px}
.cls .lrow{grid-template-columns:minmax(140px,1.4fr) minmax(200px,1.8fr) 84px 130px}
.fees .lrow{grid-template-columns:minmax(140px,1.4fr) 150px 110px auto}
.empty{padding:28px 20px;text-align:center;color:var(--muted)}
.empty b{display:block;color:var(--ink);font-size:16px;margin-bottom:4px}
.empty .btn{margin-top:12px}

/* ===== Điểm danh ===== */
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:16px}
select,input[type=date],input[type=time],input[type=text],input[type=tel],input[type=search],input[type=number],textarea{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 11px;min-height:38px}
textarea{width:100%;min-height:70px;resize:vertical}
.note{padding:10px 14px;border-radius:10px;background:var(--flesh-soft);font-size:13px;margin:0 0 14px}
.held{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:16px}
.held > span{font-weight:600}
.offcard{border-left:5px solid var(--abs);padding:16px 18px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center}
.offcard b{display:block;font-size:16px}
.arow{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;padding:12px 16px;border-top:1px solid var(--line)}
.arow:first-child{border-top:0}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:0;background:var(--surface);padding:7px 12px;cursor:pointer;font-size:13px;font-weight:600;color:var(--muted);border-left:1px solid var(--line)}
.seg button:first-child{border-left:0}
.seg button[aria-pressed=true][data-s=present]{background:var(--ok);color:#fff}
.seg button[aria-pressed=true][data-s=late]{background:var(--late);color:#fff}
.seg button[aria-pressed=true][data-s=excused]{background:var(--exc);color:#fff}
.seg button[aria-pressed=true][data-s=absent]{background:var(--abs);color:#fff}
.seg button[aria-pressed=true][data-s=held]{background:var(--skin);color:var(--skin-ink)}
.seg button[aria-pressed=true][data-s=off]{background:var(--abs);color:#fff}
.seg.lg button{padding:9px 18px;font-size:14px}
.hist{overflow-x:auto}
.hist table{border-collapse:collapse;width:100%;font-size:13px}
.hist th,.hist td{padding:8px 10px;border-top:1px solid var(--line);text-align:center;white-space:nowrap}
.hist th{font-weight:600;color:var(--muted);border-top:0}
.hist td:first-child,.hist th:first-child{text-align:left}
.hist .l{text-align:left}
.mk{display:inline-block;width:22px;height:22px;line-height:22px;border-radius:6px;font-size:11px;font-weight:700;color:#fff}
.mk.present{background:var(--ok)}.mk.late{background:var(--late)}.mk.excused{background:var(--exc)}.mk.absent{background:var(--abs)}
.mk.none{background:none;color:var(--muted)}
.mk.off{background:none;color:var(--abs);border:1px dashed var(--abs);line-height:20px}

/* ===== Lịch tuần ===== */
.week{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px}
.day{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px;min-height:150px;display:flex;flex-direction:column;gap:6px}
.day.today{border-color:var(--skin);box-shadow:inset 0 0 0 1px var(--skin)}
.day-h{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--muted)}
.day-h b{font-size:18px;color:var(--ink)}
.ev{border-left:3px solid var(--c);background:var(--flesh-soft);border-radius:4px 8px 8px 4px;padding:6px 8px;font-size:12px;cursor:pointer;text-align:left;border-top:0;border-right:0;border-bottom:0;width:100%}
.ev b{display:block;font-size:13px}
.ev.off{border-left-style:dashed;background:none;outline:1px dashed var(--line)}
.ev.off b{text-decoration:line-through}
.ev.off .why{color:var(--abs)}
.ev:hover{background:var(--flesh)}

/* ===== Thông tin nhanh ===== */
.facts{display:flex;flex-wrap:wrap;gap:10px 28px;margin:14px 0}
.facts div{display:flex;flex-direction:column}
.facts span{font-size:12px;color:var(--muted)}
.facts b{font-size:17px;font-variant-numeric:tabular-nums}
.minirow{display:flex;gap:10px;align-items:center;padding:7px 0;border-top:1px solid var(--line);font-size:14px;flex-wrap:wrap}

/* ===== Hộp thoại ===== */
dialog{border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);padding:0;width:min(580px,calc(100vw - 24px));max-height:calc(100vh - 48px)}
dialog::backdrop{background:rgba(20,26,14,.45)}
.dlg{padding:22px 22px 18px;display:flex;flex-direction:column;gap:14px}
.dlg h3{margin:0;font-size:20px;font-weight:800}
.dlg .lead{margin:-6px 0 0;color:var(--muted);font-size:14px}
.fld{display:flex;flex-direction:column;gap:5px}
.fld > span{font-size:13px;font-weight:600}
.fld small{color:var(--muted);font-size:12px}
.fld input,.fld select{width:100%}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.group{border-top:1px solid var(--line);padding-top:14px;display:flex;flex-direction:column;gap:12px}
.group > b{font-size:15px}
.checks{display:flex;flex-wrap:wrap;gap:6px}
.checks label,.radios label{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:9px;padding:7px 11px;cursor:pointer;font-size:14px}
.checks label:has(input:checked),.radios label:has(input:checked){background:var(--flesh);border-color:var(--skin)}
.checks input,.radios input{accent-color:var(--skin)}
.radios{display:flex;flex-direction:column;gap:6px}
.sw{display:flex;gap:8px}
.sw label{width:30px;height:30px;border-radius:50%;background:var(--c);cursor:pointer;display:grid;place-items:center}
.sw input{position:absolute;opacity:0;pointer-events:none}
.sw label:has(input:checked){box-shadow:0 0 0 3px var(--surface),0 0 0 5px var(--c)}
.sw label:has(input:focus-visible){outline:2px solid var(--ink);outline-offset:4px}
.dayrows{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.dayrow{display:grid;grid-template-columns:130px 1fr auto 1fr;gap:8px;align-items:center;padding:6px 10px;border-top:1px solid var(--line)}
.dayrow:first-child{border-top:0}
.dayrow.on{background:var(--flesh-soft)}
.dayrow input[type=time]{min-height:34px;padding:4px 8px;width:100%}
.dayrow input[type=time]:disabled{opacity:.35}
.dchk{display:flex;align-items:center;gap:8px;cursor:pointer;font-weight:500}
.dchk input{accent-color:var(--skin);width:16px;height:16px}
.dlg-f{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;padding-top:6px}
.dlg-f .r{display:flex;gap:8px;margin-left:auto}
.err{color:var(--abs);font-size:13px;margin:0}


/* ===== Trạng thái buổi học ===== */
.stt-held{color:var(--ok);font-weight:600}
.stt-wait{color:var(--pit);font-weight:600}
.sess.wait{border-left-style:solid;box-shadow:inset 0 0 0 1px var(--flesh)}
.more{display:flex;justify-content:center;margin-top:10px}
/* Lớp đang học trong form học viên */
.joinrow{display:grid;grid-template-columns:1fr 180px;gap:8px;align-items:center;padding:6px 10px;border-top:1px solid var(--line)}
.joinrow:first-child{border-top:0}
.joinrow.on{background:var(--flesh-soft)}
.joinrow input[type=date]{min-height:34px;padding:4px 8px;width:100%}
.joinrow input[type=date]:disabled{opacity:.35}
@media (max-width:480px){.joinrow{grid-template-columns:1fr}}

/* ===== Màn hình nhỏ ===== */
@media (max-width:860px){
  .lrow{grid-template-columns:1fr auto;row-gap:8px}
  .lrow > .c-cls{grid-column:1/-1;order:3}
  .lrow > .c-band{grid-column:1/-1;order:4}
  .lrow > .c-exam{display:none}
  .lhead{display:none}
  .cls .lrow,.fees .lrow{grid-template-columns:1fr auto}
  .week{grid-template-columns:1fr}
  .day{min-height:0}
  .day.empty-day{display:none}
}
@media (max-width:760px){
  .app{grid-template-columns:1fr}
  nav.side{position:fixed;top:auto;bottom:0;left:0;right:0;height:auto;flex-direction:row;justify-content:space-around;padding:6px 2px calc(6px + env(safe-area-inset-bottom,0px));background:var(--surface);border-right:0;border-top:1px solid var(--line);z-index:5;gap:0}
  .brand,.save{display:none}
  .nav{flex-direction:column;gap:2px;font-size:10.5px;padding:6px 4px;flex:1;align-items:center}
  .badge{position:absolute;top:2px;right:calc(50% - 22px);margin:0;min-width:17px;height:17px;font-size:10px}
  main{padding:22px 16px 110px}
  .sess{grid-template-columns:1fr auto}
  .sess .st{flex-direction:row;gap:8px;grid-column:1/-1}
  .arow{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  .prog .pbar{width:110px}
}
@media (max-width:480px){
  .dayrow{grid-template-columns:1fr 1fr;row-gap:6px}
  .dchk{grid-column:1/-1}
  .dayrow > .muted{display:none}
}
@media (prefers-reduced-motion:no-preference){
  .nav,.btn,.lrow,.ev{transition:background-color .15s,border-color .15s}
}