/* Luyện gõ phím (/cong-cu/go-phim). Tệp nạp ở mọi trang → mọi lớp có tiền tố gp-. Ưu tiên màn chiếu 1280–1920px. */
.chinh:has(> .gp) { max-width: 1500px; }
.gp [hidden] { display: none !important; }
.gp:fullscreen { background: var(--bg); padding: 16px clamp(16px, 2.5vw, 36px); overflow: auto; }
.gp-an-chu { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.gp-dau { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 12px; }
.gp-dau h1 { margin: 0; }
.gp-dau .phu { margin: 2px 0 0; max-width: 70ch; }
.gp-dau__phai { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.gp-kieu { margin: 0; min-width: 150px; }

.gp-khung { display: grid; gap: 16px; align-items: start; grid-template-columns: minmax(0, 1fr); }
.gp-bai, .gp-them > * { min-width: 0; }
@media (min-width: 1000px) { .gp-khung { grid-template-columns: 290px minmax(0, 1fr); } }

/* Danh sách bài */
.gp-bai { background: var(--the); border: 1px solid var(--vien); border-radius: var(--r); padding: 14px; box-shadow: var(--bong); }
.gp-bai h2 { font-size: 1.05rem; margin-bottom: 4px; }
.gp-bai h3 { font-size: .8125rem; text-transform: uppercase; letter-spacing: .04em; color: var(--phu); margin: 12px 0 4px; }
.gp-bai ul { list-style: none; margin: 0; padding: 0; }
.gp-bai__muc { display: flex; flex-direction: column; align-items: flex-start; width: 100%; min-height: 44px; padding: 6px 10px; border: 0; border-radius: var(--r-nho);
  background: none; font: inherit; color: var(--chu); text-align: left; cursor: pointer; }
.gp-bai__muc:hover { background: var(--c-nhat); }
.gp-bai__muc[aria-current="true"] { background: var(--c-dam); color: #fff; }
.gp-bai__muc small { font-size: .78rem; color: var(--nhan-dam); font-weight: 700; }
.gp-bai__muc[aria-current="true"] small { color: var(--nhan); }
@media (min-width: 1000px) { .gp-bai { position: sticky; top: 72px; max-height: calc(100vh - 90px); overflow: auto; } }
@media (max-width: 999px) {
  .gp-bai #gp-ds { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; }
  .gp-bai h3 { display: none; }
  .gp-bai ul { display: contents; }
  .gp-bai__muc { width: auto; flex: none; white-space: nowrap; border: 1px solid var(--vien); }
}

/* Vùng luyện */
.gp-tap { background: var(--the); border: 1px solid var(--vien); border-radius: var(--r); padding: clamp(14px, 2vw, 24px); box-shadow: var(--bong); min-width: 0; }
.gp-tap__h { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 10px; margin-bottom: 12px; }
.gp-tap__h h2 { margin: 0; font-size: 1.25rem; }
.gp-cap { margin: 0; font-size: .8125rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--nhan-dam); }
.gp-so { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gp-so li { background: var(--c-nhat); border-radius: var(--r-nho); padding: 8px 12px; display: flex; flex-direction: column; }
.gp-so b { font-size: clamp(1.4rem, 2.4vw, 2rem); line-height: 1.15; color: var(--c-dam); font-variant-numeric: tabular-nums; }
.gp-so span { font-size: .8125rem; color: var(--phu); }

.gp-mau { font-size: clamp(1.35rem, 2.3vw, 2.1rem); line-height: 1.7; padding: 14px 18px; border: 1px solid var(--vien); border-radius: var(--r-nho);
  background: #fbfcfb; letter-spacing: .01em; word-break: break-word; color: #3c4a4c; }
.gp-c { border-radius: 3px; }
.gp-c--ok { color: var(--xanh-la); }
.gp-c--dang { color: var(--nhan-dam); background: var(--nhan-nhat); }
.gp-c--sai { color: #fff; background: var(--do); }
.gp-c--cach.gp-c--sai { background: color-mix(in srgb, var(--do) 70%, #fff); }
.gp-c--hien { box-shadow: inset 0 -3px 0 var(--c); background: var(--c-nhat); }
.gp-goi-y { min-height: 1.6em; margin: 8px 0 10px; font-weight: 600; color: var(--c-dam); }
.gp-o { margin: 0; }
.gp-o textarea { font-size: clamp(1.2rem, 2vw, 1.7rem); line-height: 1.5; min-height: 0; resize: vertical; }
.gp-xong { margin: 10px 0 0; font-weight: 700; }

/* Bàn phím ảo: màu theo ngón tay */
.gp-phim { margin-top: 16px; display: flex; flex-direction: column; gap: 5px; max-width: 900px; margin-left: auto; margin-right: auto; user-select: none; }
.gp-hang { display: flex; gap: 5px; }
.gp-hang:last-child { justify-content: center; }
.gp-hang:last-child .gp-k { flex: 0 0 48% !important; }
.gp-k { flex: 1 1 0; min-width: 0; height: clamp(34px, 3.6vw, 48px); display: grid; place-items: center; border-radius: 7px; border: 1px solid rgba(0,0,0,.14);
  font-size: clamp(.72rem, 1.1vw, .95rem); font-weight: 700; color: #243235; box-shadow: 0 2px 0 rgba(0,0,0,.12); white-space: nowrap; overflow: hidden; }
.gp-k--moc { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.gp-k--ut-t, .gp-k--ut-p { background: #fbd9dd; }
.gp-k--ap-t, .gp-k--ap-p { background: #fdecc0; }
.gp-k--giua-t, .gp-k--giua-p { background: #d3f0dc; }
.gp-k--tro-t { background: #d6e6fb; }
.gp-k--tro-p { background: #e4d9f7; }
.gp-k--cai { background: #e6eaec; }
.gp-k.gp-k--sang { background: var(--c-dam); color: #fff; border-color: var(--c-dam); box-shadow: 0 0 0 3px var(--nhan); transform: translateY(1px); }
.gp-ngon { list-style: none; margin: 12px auto 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 16px; max-width: 900px;
  font-size: .8125rem; color: var(--phu); }
.gp-ngon li { display: inline-flex; align-items: center; gap: 6px; }
.gp-ngon__o { width: 16px; height: 16px; border-radius: 4px; border: 1px solid rgba(0,0,0,.14); }

/* Phần dưới */
.gp-them { display: grid; gap: 14px; margin-top: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) { .gp-them { grid-template-columns: repeat(2, minmax(0, 1fr)); } .gp-ls { grid-column: 1 / -1; } }
.gp-mo > summary { cursor: pointer; font-weight: 700; min-height: 32px; }
.gp-mo[open] > summary { margin-bottom: 10px; }
.gp-mo kbd { font-family: ui-monospace, Consolas, monospace; background: var(--c-nhat); border-radius: 4px; padding: 1px 6px; color: var(--c-dam); }
.gp-bang-khung { overflow-x: auto; }
.gp-bang { border-collapse: collapse; width: 100%; font-size: .9375rem; }
.gp-bang th, .gp-bang td { padding: 6px 10px; border-bottom: 1px solid var(--vien); text-align: left; }
.gp-bang th { background: var(--c-nhat); color: var(--c-dam); }
.gp-mo .gp-bang td:not(:first-child) { font-family: ui-monospace, Consolas, monospace; font-weight: 700; }

@media (max-width: 640px) {
  .gp-so { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gp-phim, .gp-ngon { display: none; }
  .gp-mau { font-size: 1.25rem; padding: 10px 12px; }
}