:root {
  --nen: #f4f6fb;
  --nen-the: #ffffff;
  --nen-phu: #eef1f7;
  --chu: #172033;
  --chu-mo: #5b6478;
  --vien: #dde2ec;
  --nhan: #1d4ed8;
  --nhan-dam: #1e3a8a;
  --tieu-hoc: #0f766e;
  --tieu-hoc-nen: #e0f3f0;
  --thcs-thpt: #6d28d9;
  --thcs-thpt-nen: #efe8fd;
  --trung: #dc2626;
  --trung-nen: #fdecec;
  --bong: 0 1px 2px rgba(16, 24, 40, 0.05), 0 4px 16px rgba(16, 24, 40, 0.05);
  --bo-goc: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --nen: #0d1220;
    --nen-the: #151c2e;
    --nen-phu: #1c2539;
    --chu: #e7ebf4;
    --chu-mo: #98a2b8;
    --vien: #2a3450;
    --nhan: #7aa2ff;
    --nhan-dam: #1e3a8a;
    --tieu-hoc: #2dd4bf;
    --tieu-hoc-nen: #11332f;
    --thcs-thpt: #b49cff;
    --thcs-thpt-nen: #261d45;
    --trung: #f87171;
    --trung-nen: #3a1717;
    --bong: 0 1px 2px rgba(0, 0, 0, 0.3);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --nen: #0d1220;
  --nen-the: #151c2e;
  --nen-phu: #1c2539;
  --chu: #e7ebf4;
  --chu-mo: #98a2b8;
  --vien: #2a3450;
  --nhan: #7aa2ff;
  --nhan-dam: #1e3a8a;
  --tieu-hoc: #2dd4bf;
  --tieu-hoc-nen: #11332f;
  --thcs-thpt: #b49cff;
  --thcs-thpt-nen: #261d45;
  --trung: #f87171;
  --trung-nen: #3a1717;
  --bong: 0 1px 2px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--nen);
  color: var(--chu);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button {
  font: inherit;
  color: inherit;
}

.khung {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.dau-trang {
  background: linear-gradient(135deg, #1e3a8a, #1d4ed8 60%, #2563eb);
  color: #fff;
  padding: 28px 0 64px;
}

.dau-trang-trong {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.nhan-tren {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: 0.02em;
  opacity: 0.8;
}

h1 {
  margin: 0;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.trang-thai {
  margin: 6px 0 0;
  font-size: 13.5px;
  opacity: 0.88;
}

.trang-thai.loi {
  color: #fecaca;
  opacity: 1;
}

.nut-cap-nhat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 0;
  border-radius: 999px;
  background: #fff;
  color: var(--nhan-dam);
  padding: 10px 20px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.nut-cap-nhat:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.3);
}

.nut-cap-nhat:disabled {
  opacity: 0.75;
  cursor: progress;
}

.nut-cap-nhat.dang-tai svg {
  animation: xoay 0.9s linear infinite;
}

@keyframes xoay {
  to {
    transform: rotate(360deg);
  }
}

main.khung {
  margin-top: -40px;
}

.hom-nay {
  padding: 16px 18px;
  margin-bottom: 12px;
  border-left: 4px solid var(--nhan);
}

.hom-nay.khong-co-buoi {
  border-left-color: var(--vien);
}

.dau-hom-nay {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.tieu-de-hom-nay {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.nhan-hom-nay {
  font-size: 13px;
  font-weight: 600;
  color: var(--nhan);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tieu-de-hom-nay strong {
  font-size: 18px;
}

.nhan-nho.xanh {
  background: color-mix(in srgb, var(--nhan) 12%, transparent);
  color: var(--nhan);
}

.khong-lich-hom-nay {
  margin: 12px 0 2px;
  font-size: 20px;
  font-weight: 700;
}

.buoi-toi-hom-nay {
  margin: 0;
  font-size: 14px;
  color: var(--chu-mo);
}

.canh-bao-trung {
  margin: 10px 0 0;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--trung-nen);
  color: var(--trung);
  font-size: 14px;
  font-weight: 600;
}

.hang-hom-nay {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin-top: 10px;
}

.hang-hom-nay .dong-buoi {
  margin-top: 0;
}

.ben-hom-nay {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.trang-thai-buoi {
  font-size: 13px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.trang-thai-buoi.sap-hoc {
  background: color-mix(in srgb, var(--nhan) 12%, transparent);
  color: var(--nhan);
}

.trang-thai-buoi.dang-hoc {
  background: var(--tieu-hoc-nen);
  color: var(--tieu-hoc);
}

.trang-thai-buoi.da-xong {
  background: var(--nen-phu);
  color: var(--chu-mo);
}

.nut-vao-lop {
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  background: var(--nhan-dam);
  text-decoration: none;
  border-radius: 8px;
  padding: 6px 12px;
  white-space: nowrap;
}

.nut-vao-lop:hover {
  filter: brightness(1.08);
}

.tong-quan {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.the {
  background: var(--nen-the);
  border: 1px solid var(--vien);
  border-radius: var(--bo-goc);
  box-shadow: var(--bong);
}

.the-so {
  padding: 16px 18px;
  min-width: 0;
}

.the-so .nhan {
  font-size: 13px;
  color: var(--chu-mo);
  display: flex;
  align-items: center;
  gap: 6px;
}

.the-so .so {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  margin-top: 4px;
}

.the-so .phu {
  font-size: 13px;
  color: var(--chu-mo);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.the-so.buoi-toi .so {
  font-size: 17px;
  line-height: 1.35;
}

.the-so.co-trung .so {
  color: var(--trung);
}

.cham {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
}

.cham.tieu-hoc {
  background: var(--tieu-hoc);
}

.cham.thcs-thpt {
  background: var(--thcs-thpt);
}

.cham.trung {
  background: var(--trung);
}

.phan {
  margin-top: 32px;
}

.dau-phan {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.dau-phan h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.mo-ta-phan {
  margin: 0;
  color: var(--chu-mo);
  font-size: 14px;
}

.dau-phan-lich {
  justify-content: space-between;
  align-items: center;
}

.cong-cu-lich {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nhom-chon {
  display: inline-flex;
  background: var(--nen-phu);
  border: 1px solid var(--vien);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}

.nhom-chon button {
  border: 0;
  background: transparent;
  border-radius: 7px;
  padding: 6px 12px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--chu-mo);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.nhom-chon button.dang-chon {
  background: var(--nen-the);
  color: var(--chu);
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.12);
}

.lich-trung {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}

.the-trung {
  border-left: 4px solid var(--trung);
  padding: 14px 16px;
}

.the-trung.da-qua {
  opacity: 0.6;
}

.the-trung .ngay-trung {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
}

.the-trung .ngay-trung strong {
  font-size: 16px;
}

.nhan-nho {
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--trung-nen);
  color: var(--trung);
  white-space: nowrap;
}

.nhan-nho.xam {
  background: var(--nen-phu);
  color: var(--chu-mo);
}

.dong-buoi {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  padding: 8px 10px;
  border-radius: 10px;
  margin-top: 6px;
}

.dong-buoi.tieu-hoc {
  background: var(--tieu-hoc-nen);
}

.dong-buoi.thcs-thpt {
  background: var(--thcs-thpt-nen);
}

.dong-buoi .ten-cap {
  font-size: 12px;
  font-weight: 700;
  grid-row: span 2;
  align-self: center;
  min-width: 74px;
}

.dong-buoi.tieu-hoc .ten-cap {
  color: var(--tieu-hoc);
}

.dong-buoi.thcs-thpt .ten-cap {
  color: var(--thcs-thpt);
}

.dong-buoi .chuyen-de {
  font-weight: 600;
  font-size: 14px;
}

.dong-buoi .chi-tiet {
  font-size: 13px;
  color: var(--chu-mo);
}

.trong {
  padding: 22px;
  text-align: center;
  color: var(--chu-mo);
}

.lich-thang {
  padding: 14px;
}

.dieu-huong-thang {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}

.dieu-huong-thang strong {
  font-size: 17px;
}

.nut-thang {
  border: 1px solid var(--vien);
  background: var(--nen-the);
  border-radius: 8px;
  width: 36px;
  height: 34px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nut-thang:hover {
  border-color: var(--nhan);
}

.nut-hom-nay {
  width: auto;
  padding: 0 12px;
  font-size: 13.5px;
}

.luoi-thang {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
}

.ten-thu {
  font-size: 12px;
  font-weight: 600;
  color: var(--chu-mo);
  text-align: center;
  padding: 2px 0 4px;
}

.o-ngay {
  min-height: 104px;
  border: 1px solid var(--vien);
  border-radius: 10px;
  padding: 6px;
  background: var(--nen-the);
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.o-ngay.ngoai-thang {
  background: transparent;
  border-style: dashed;
  opacity: 0.45;
}

.o-ngay.hom-nay {
  border-color: var(--nhan);
  box-shadow: inset 0 0 0 1px var(--nhan);
}

.o-ngay.co-trung {
  border-color: var(--trung);
  background: var(--trung-nen);
}

.so-ngay {
  font-size: 13px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.o-ngay.hom-nay .so-ngay span:first-child {
  background: var(--nhan);
  color: #fff;
  border-radius: 999px;
  padding: 0 7px;
}

.nhan-trung {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--trung);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.vien-buoi {
  border-radius: 6px;
  padding: 3px 6px;
  font-size: 12px;
  line-height: 1.3;
  border-left: 3px solid;
  overflow: hidden;
}

.vien-buoi.tieu-hoc {
  background: var(--tieu-hoc-nen);
  border-color: var(--tieu-hoc);
}

.vien-buoi.thcs-thpt {
  background: var(--thcs-thpt-nen);
  border-color: var(--thcs-thpt);
}

.vien-buoi .gio {
  font-weight: 600;
}

.vien-buoi .ten {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.danh-sach {
  padding: 6px 16px;
}

.nhom-ngay {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--vien);
}

.nhom-ngay:last-child {
  border-bottom: 0;
}

.nhom-ngay.da-qua {
  opacity: 0.55;
}

.nhom-ngay .cot-ngay strong {
  display: block;
  font-size: 15px;
}

.nhom-ngay .cot-ngay span {
  font-size: 13px;
  color: var(--chu-mo);
}

.nhom-ngay .dong-buoi:first-child {
  margin-top: 0;
}

.hang-tuy-chon {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 0 4px;
  font-size: 13.5px;
  color: var(--chu-mo);
}

.hang-tuy-chon label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.thong-tin-lop {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}

.the-lop {
  padding: 16px 18px;
  border-top: 4px solid;
}

.the-lop.tieu-hoc {
  border-top-color: var(--tieu-hoc);
}

.the-lop.thcs-thpt {
  border-top-color: var(--thcs-thpt);
}

.the-lop h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.the-lop p {
  margin: 2px 0;
  font-size: 14px;
  color: var(--chu-mo);
}

.the-lop .loi {
  color: var(--trung);
}

.cac-lien-ket {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.cac-lien-ket a {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--nhan);
  text-decoration: none;
  border: 1px solid var(--vien);
  border-radius: 8px;
  padding: 5px 10px;
}

.cac-lien-ket a:hover {
  border-color: var(--nhan);
}

.chan-trang {
  color: var(--chu-mo);
  font-size: 13px;
  padding-top: 28px;
  padding-bottom: 40px;
}

@media (max-width: 860px) {
  .tong-quan {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .dau-trang {
    padding: 20px 0 56px;
  }

  .nut-cap-nhat {
    width: 100%;
    justify-content: center;
  }

  .hang-hom-nay {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .ben-hom-nay {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .the-so .so {
    font-size: 24px;
  }

  .lich-thang {
    padding: 8px;
  }

  .luoi-thang {
    gap: 3px;
  }

  .o-ngay {
    min-height: 58px;
    padding: 3px;
    border-radius: 7px;
  }

  .vien-buoi {
    padding: 0;
    height: 6px;
    border-left: 0;
    border-radius: 3px;
  }

  .vien-buoi.tieu-hoc {
    background: var(--tieu-hoc);
  }

  .vien-buoi.thcs-thpt {
    background: var(--thcs-thpt);
  }

  .vien-buoi .gio,
  .vien-buoi .ten,
  .nhan-trung {
    display: none;
  }

  .so-ngay {
    font-size: 12px;
  }

  .nhom-ngay {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .lich-trung {
    grid-template-columns: 1fr;
  }

  .cong-cu-lich,
  .nhom-chon {
    width: 100%;
  }

  .nhom-chon button {
    flex: 1;
    justify-content: center;
    padding: 6px 6px;
  }
}