/* تدريب دوال Excel (/excel-practice) — يُحمَّل بعد site.css و program.css و lesson.css و article.css */
.px-code,.px-ltr{font-family:'JetBrains Mono',monospace; direction:ltr; unicode-bidi:isolate}
.px-code{font-size:.92em; padding:1px 6px; border-radius:6px; background:var(--glass-strong); color:var(--text); overflow-wrap:anywhere}

/* الاسم وشريط النقاط */
.px-name{padding:22px 24px; border-radius:20px; display:grid; gap:12px; margin-bottom:26px}
.px-name h2{margin:0; font-size:21px; color:var(--text)}
.px-name p{margin:0; color:var(--text-mute)}
.px-name form{display:flex; flex-wrap:wrap; gap:10px}
.px-name input{flex:1 1 220px; min-width:0; font:inherit; font-size:17px; padding:11px 16px; border-radius:12px; border:1px solid var(--glass-border-strong); background:var(--glass); color:var(--text)}
.px-name input:focus{outline:2px solid var(--blue-400); outline-offset:1px}
.px-name .note{color:#fb923c; font-weight:700}
.px-bar{display:grid; grid-template-columns:1fr auto; gap:10px 18px; align-items:center; padding:16px 20px; border-radius:18px; margin-bottom:26px}
.px-bar .who{display:flex; flex-wrap:wrap; align-items:baseline; gap:6px 14px; color:var(--text-mute)}
.px-bar .who b{font-size:19px; color:var(--text)}
.px-bar .rank{font-size:13px; font-weight:800; padding:2px 12px; border-radius:99px; background:rgba(139,92,246,.2); color:var(--purple-400)}
.px-bar .pts{font-size:15px}
.px-bar .pts b{font-size:26px; color:#4ade80}
.px-bar .track{grid-column:1/-1; height:8px; border-radius:8px; background:var(--glass-strong); overflow:hidden}
.px-bar .track span{display:block; height:100%; width:0; background:linear-gradient(90deg,#22c55e,var(--blue-500)); transition:width .4s}
.px-bar .foot{grid-column:1/-1; display:flex; flex-wrap:wrap; justify-content:space-between; gap:8px; font-size:13px; color:var(--text-dim)}
.px-link{background:none; border:0; padding:0; font:inherit; font-size:13px; font-weight:700; color:var(--blue-400); cursor:pointer}
.px-link:hover{text-decoration:underline}

/* قائمة التمارين */
.px-level{margin-bottom:30px}
.px-level h2{display:flex; flex-wrap:wrap; align-items:baseline; gap:10px; font-size:22px; color:var(--text); margin:0 0 4px}
.px-level h2 small{font-size:13px; font-weight:800; padding:2px 12px; border-radius:99px; background:rgba(74,222,128,.16); color:#4ade80}
.px-level > p{margin:0 0 14px; color:var(--text-dim); font-size:15px}
.px-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(210px,1fr)); gap:12px}
.px-card{display:grid; gap:6px; padding:14px 16px; border-radius:16px; text-align:start; font:inherit; color:var(--text-mute); cursor:pointer; transition:transform .2s, border-color .2s}
.px-card:hover,.px-card:focus-visible{transform:translateY(-3px); border-color:var(--glass-border-strong); outline:none}
.px-card .fn{font-family:'JetBrains Mono',monospace; font-weight:600; font-size:15px; color:var(--blue-400); unicode-bidi:plaintext; text-align:start}
.px-card b{font-size:16px; color:var(--text)}
.px-card .st{font-size:13px; font-weight:800; color:#4ade80; min-height:1.3em}
.px-card.done{border-color:rgba(74,222,128,.45); background:rgba(34,197,94,.08)}
.px-board{padding:18px 22px; border-radius:18px; margin-top:8px}
.px-board h2{margin:0 0 10px; font-size:19px; color:var(--text)}
.px-board ol{margin:0; padding-inline-start:24px; display:grid; gap:6px; color:var(--text-mute)}
.px-board li{padding-inline-start:4px}
.px-board li span{display:inline-block; min-width:150px}
.px-board li.me span{color:var(--text); font-weight:800}
.px-board li b{color:#4ade80}

/* صفحة التمرين */
.px-top{display:flex; flex-wrap:wrap; align-items:center; gap:8px 12px; margin-bottom:14px}
.px-top h2{margin:0; font-size:clamp(21px,3vw,28px); color:var(--text); flex:1 1 240px}
.px-chip{font-size:13px; font-weight:800; padding:3px 12px; border-radius:99px; background:var(--glass-strong); color:var(--text-mute); white-space:nowrap}
.px-chip.fn{font-family:'JetBrains Mono',monospace; background:rgba(59,130,246,.18); color:var(--blue-400)}
.px-chip.lv{background:rgba(74,222,128,.16); color:#4ade80}
.px-explain{padding:18px 22px; border-radius:18px; margin-bottom:16px}
.px-explain summary{cursor:pointer; font-size:19px; font-weight:800; color:var(--text)}
.px-explain[open] summary{margin-bottom:10px}
.px-explain p{margin:0 0 12px; color:var(--text-mute); font-size:17px; line-height:1.9}
.px-explain h3{margin:14px 0 6px; font-size:14px; color:var(--text-dim); font-weight:800}
.px-f{display:block; direction:ltr; text-align:left; font-family:'JetBrains Mono',monospace; font-size:15px; padding:10px 14px; border-radius:10px; background:#0b1222; color:#e2e8f0; border:1px solid rgba(148,163,184,.25); overflow-x:auto; white-space:pre-wrap; overflow-wrap:anywhere}
.px-args{display:grid; grid-template-columns:auto 1fr; gap:6px 14px; margin:0; align-items:baseline}
.px-args dt{font-family:'JetBrains Mono',monospace; font-size:13.5px; color:var(--purple-400); text-align:left; unicode-bidi:isolate}
.px-args dd{margin:0; color:var(--text-mute); font-size:15px}
.px-explain .px-foot{display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin-top:16px}
.px-explain .px-foot a{color:var(--blue-400); font-weight:700; font-size:14px; text-decoration:none}

.px-work{display:grid; gap:14px}
.px-task{padding:14px 18px; border-radius:14px; border-inline-start:4px solid var(--blue-500); background:var(--glass); color:var(--text); font-size:17px; line-height:1.9; margin:0}
.px-task b{color:var(--blue-400)}
.px-keys{display:flex; flex-wrap:wrap; gap:6px; direction:ltr; align-items:center}
.px-keys button{min-width:38px; height:36px; padding:0 8px; border-radius:9px; border:1px solid var(--glass-border); background:var(--glass); color:var(--text); font-family:'JetBrains Mono',monospace; font-size:16px; cursor:pointer}
.px-keys button:hover{border-color:var(--glass-border-strong)}
.px-keys span{font-size:13px; color:var(--text-dim); direction:rtl; margin-inline-start:6px}

.px-fb{border-radius:14px; padding:12px 16px; border-inline-start:4px solid; background:var(--glass)}
.px-fb.ok{border-color:#22c55e; background:rgba(34,197,94,.1)}
.px-fb.no{border-color:#ef4444}
.px-fb.tip{border-color:#f59e0b}
.px-fb b{display:block; color:var(--text); font-size:18px; margin-bottom:2px}
.px-fb.ok b{color:#4ade80}
.px-fb p{margin:0; color:var(--text-mute); line-height:2; font-size:16px}
.px-actions{display:flex; flex-wrap:wrap; gap:10px}


html[data-theme="light"] .px-fb.ok b,html[data-theme="light"] .px-bar .pts b,html[data-theme="light"] .px-board li b,html[data-theme="light"] .px-card .st{color:#15803d}
html[data-theme="light"] .px-level h2 small,html[data-theme="light"] .px-chip.lv{color:#15803d}

@media (max-width:640px){
  .px-args{grid-template-columns:1fr}
  .px-args dd{margin-bottom:6px}
}

/* إحصاءات المحاولات والتشجيع */
.px-bar .stats{grid-column:1/-1; display:flex; flex-wrap:wrap; gap:8px}
.px-bar .stats .s{font-size:13px; padding:4px 12px; border-radius:99px; background:var(--glass-strong); color:var(--text-mute)}
.px-bar .stats .s b{color:var(--text); font-size:15px; margin-inline-start:4px}
.px-bar .stats .ok b{color:#4ade80}
.px-bar .stats .no b{color:#f87171}
html[data-theme="light"] .px-bar .stats .ok b{color:#15803d}
html[data-theme="light"] .px-bar .stats .no b{color:#b91c1c}
.px-retry{display:block; margin-top:6px; font-weight:800; color:var(--text)}
.px-board-note{margin:0 0 8px; font-size:13px; color:var(--text-dim)}
.px-tries{font-size:13px; color:var(--text-dim); margin-inline:auto 12px}

.art-main [hidden]{display:none !important}

/* ───── نافذة Excel: ألوانها ثابتة (فاتحة) في الوضعين لتشبه البرنامج الحقيقي ───── */
.xl{border-radius:12px; overflow:hidden; border:1px solid #0b5c30; background:#fff; color:#1f2937; box-shadow:0 18px 50px rgba(0,0,0,.35)}
.xl-title{display:flex; align-items:center; gap:10px; padding:7px 12px; background:#107c41; color:#fff; font-size:13px; font-weight:700}
.xl-logo{display:grid; place-items:center; width:22px; height:22px; border-radius:4px; background:#fff; color:#107c41; font-weight:900; font-family:Arial,sans-serif}
.xl-title .win{margin-inline-start:auto; letter-spacing:10px; opacity:.85; font-weight:400}
.xl-tabs{display:flex; gap:2px; padding:0 8px; background:#107c41; color:#e6f4ea; font-size:13px; overflow:hidden; white-space:nowrap}
.xl-tabs span{padding:5px 12px; border-radius:6px 6px 0 0}
.xl-tabs .on{background:#f3f3f3; color:#107c41; font-weight:800}
.xl-ribbon{display:flex; flex-wrap:wrap; align-items:center; gap:6px; padding:7px 10px; background:#f3f3f3; border-bottom:1px solid #d4d4d4; direction:ltr}
.xl-ribbon button{min-width:36px; height:34px; padding:0 9px; border-radius:6px; border:1px solid #c8c8c8; background:#fff; color:#1f2937; font-family:'JetBrains Mono',monospace; font-size:16px; cursor:pointer}
.xl-ribbon button:hover{background:#e2efda; border-color:#107c41}
.xl-ribbon button.enter{background:#107c41; border-color:#107c41; color:#fff; font-family:inherit; font-size:14px; font-weight:800; padding:0 14px}
.xl-ribbon .sep{width:1px; height:24px; background:#d4d4d4; margin:0 4px}
.xl-fbar{display:flex; align-items:stretch; gap:0; direction:ltr; background:#fff; border-bottom:1px solid #d4d4d4}
.xl-name{display:flex; align-items:center; justify-content:center; min-width:70px; padding:0 10px; border-right:1px solid #d4d4d4; font-family:'JetBrains Mono',monospace; font-weight:600; font-size:14px; color:#1f2937}
.xl-ic{width:32px; border:0; background:none; font-size:15px; color:#9ca3af; cursor:pointer}
.xl-ic.x:hover{color:#dc2626} .xl-ic.ok:hover{color:#107c41}
.xl-fbar.editing .xl-ic.x{color:#dc2626} .xl-fbar.editing .xl-ic.ok{color:#107c41}
.xl-fbar .fx{display:flex; align-items:center; padding:0 10px; border-right:1px solid #d4d4d4; font-style:italic; font-family:Georgia,serif; color:#6b7280; font-size:16px}
.xl-fbar input{flex:1; min-width:0; border:0; outline:0; background:#fff; color:#111827; direction:ltr; text-align:left; font-family:'JetBrains Mono',monospace; font-size:16px; padding:9px 12px}
.xl-tip{direction:ltr; text-align:left; display:flex; flex-wrap:nowrap; white-space:nowrap; overflow-x:auto; align-items:center; gap:6px; padding:6px 10px; background:#fffbe6; border-bottom:1px solid #e5d9a3; font-family:'JetBrains Mono',monospace; font-size:13.5px; color:#4b5563; height:38px; scrollbar-width:none}
.xl-tip > *{flex:none}
.xl-tip b{color:#107c41}
.xl-tip i{font-style:normal; font-family:'Cairo',sans-serif; color:#6b7280; direction:rtl; unicode-bidi:isolate; margin-left:8px}
.xl-tip button{border:1px solid #c8c8c8; background:#fff; border-radius:6px; padding:3px 9px; font:inherit; color:#1f2937; cursor:pointer}
.xl-tip button.cur,.xl-tip button:hover{background:#107c41; border-color:#107c41; color:#fff}
.px-sheet-wrap{overflow:auto; max-height:68vh; background:#fff; outline:0; -webkit-user-select:none; user-select:none}
.px-sheet{border-collapse:separate; border-spacing:0; font-size:14px; min-width:100%}
.px-sheet th,.px-sheet td{border:0; border-inline-end:1px solid #d9d9d9; border-bottom:1px solid #d9d9d9; padding:4px 10px; white-space:nowrap; text-align:start}
.px-sheet th{position:sticky; top:0; z-index:3; background:#f3f3f3; color:#555; font-weight:600; font-size:12px; text-align:center; font-family:'JetBrains Mono',monospace; padding:3px 8px}
.px-sheet tr > th:first-child{inset-inline-start:0; z-index:4; min-width:36px}
.px-sheet tr:first-child th{z-index:5}
.px-sheet tr:first-child th:first-child{z-index:6}
.px-sheet th.hl{background:#d3e9db; color:#0b5c30; font-weight:800}
.px-sheet td{position:relative; color:#1f2937; background:#fff; cursor:cell; height:30px; min-width:74px}
.px-sheet td.n{direction:ltr; text-align:end; font-variant-numeric:tabular-nums}
.px-sheet[dir="ltr"] td.n{text-align:right}
.px-sheet td.h{font-weight:800; background:#e2efda; color:#0b3d20}
.px-sheet td.x{background:#fff7d6}
.px-sheet td.h.x{background:#ffe9a8; color:#5c4300}
.px-sheet td.inr{background:#dbeee2}
.px-sheet td.sel{box-shadow:inset 0 0 0 2px #107c41; z-index:1}
.px-sheet td.target{background:#f0fff4}
.px-sheet td.target.blank:not(.editing)::before{content:'اكتب هنا'; color:#9ca3af; font-size:12px; font-weight:400}
.px-sheet td.target.ok,.px-sheet td.filled{background:#d9f2e1; color:#0b5c30; font-weight:800}
.px-sheet td.target.no{background:#fde8e8; color:#b91c1c; font-weight:800; box-shadow:inset 0 0 0 2px #dc2626}
.px-sheet td.fillprev{box-shadow:inset 0 0 0 2px #107c41; background:#eaf6ee}
.px-sheet td.editing{overflow:visible; z-index:2; padding:0}
.px-sheet td.editing .v{visibility:hidden}
.xl-edit{position:absolute; top:-1px; inset-inline-start:-1px; height:calc(100% + 2px); min-width:calc(100% + 2px); box-sizing:border-box; border:2px solid #107c41; outline:0; background:#fff; color:#111827; direction:ltr; text-align:left; font-family:'JetBrains Mono',monospace; font-size:15px; padding:0 8px; box-shadow:0 2px 10px rgba(0,0,0,.25)}
.xl-handle{position:absolute; bottom:-4px; inset-inline-end:-4px; width:9px; height:9px; background:#107c41; border:1px solid #fff; cursor:crosshair; z-index:3; touch-action:none}
.xl-handle.pulse{animation:xlpulse 1s ease-in-out infinite}
.xl-handle.pulse::after{content:''; position:absolute; inset:-14px}
@keyframes xlpulse{50%{transform:scale(1.9)}}
.px-sheet td.r0{box-shadow:inset 0 0 0 2px #2563eb; background:#e3ecff}
.px-sheet td.r1{box-shadow:inset 0 0 0 2px #dc2626; background:#fde8e8}
.px-sheet td.r2{box-shadow:inset 0 0 0 2px #9333ea; background:#f1e6ff}
.px-sheet td.r3{box-shadow:inset 0 0 0 2px #ea580c; background:#ffeadb}
.px-sheet td.r4{box-shadow:inset 0 0 0 2px #0891b2; background:#dff6fb}
.xl-foot{display:flex; flex-wrap:wrap; align-items:center; gap:8px 14px; padding:5px 10px; background:#f3f3f3; border-top:1px solid #d4d4d4; font-size:12.5px; color:#555}
.xl-sheet-tab{padding:3px 14px; background:#fff; border-bottom:2px solid #107c41; color:#107c41; font-weight:800}
.xl-foot .px-link{color:#107c41; font-size:12.5px}
.xl-status{margin-inline-start:auto; direction:rtl}
.xl-status b{color:#1f2937; margin-inline-end:10px}
.xl-body{position:relative}
.xl-msg{position:absolute; top:8px; inset-inline:10px; z-index:8; padding:8px 14px; border-radius:8px; background:#fff4ce; border:1px solid #e5d9a3; color:#5c4300; font-size:14px; font-weight:700; box-shadow:0 6px 18px rgba(0,0,0,.2); pointer-events:none}
.px-how{margin:0; font-size:14px; color:var(--text-dim); line-height:1.9}
.px-how kbd{font-family:'JetBrains Mono',monospace; font-size:12px; padding:1px 7px; border-radius:6px; border:1px solid var(--glass-border-strong); background:var(--glass); color:var(--text)}
@media (max-width:640px){
  .px-sheet th,.px-sheet td{padding:4px 8px}
  .xl-tabs span:nth-child(n+5){display:none}
  .xl-name{min-width:52px}
  .xl-ribbon button{min-width:34px}
}
@media (prefers-reduced-motion:reduce){ .xl-handle.pulse{animation:none} }