:root{
  --bg:#eef1f7; --panel:#ffffff; --panel-2:#f4f6fb; --ink:#0f1b2d; --ink-dim:#545f78; --line:#d7dce8;
  --accent:#0d9488; --accent-ink:#ffffff; --accent-soft:#d7f5f0;
  --warn:#b45309; --warn-soft:#fdecd2;
  --ok:#15803d; --ok-soft:#dcf6e3;
  --danger:#be123c; --danger-soft:#fde2e8;
  --code-bg:#0b1220; --code-ink:#d7e2f4; --code-accent:#5eead4; --code-line:#223049; --code-dim:#7d8bab;
  --shadow:0 1px 2px rgba(15,27,45,.06), 0 10px 26px -14px rgba(15,27,45,.22);
  --radius:14px;
  --f-ar-head:'IBM Plex Sans Arabic','Tajawal',sans-serif;
  --f-ar-body:'Tajawal','IBM Plex Sans Arabic',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0a0f1c; --panel:#121b2e; --panel-2:#0f1728; --ink:#e7edf9; --ink-dim:#98a4c2; --line:#223049;
    --accent:#2dd4bf; --accent-ink:#062622; --accent-soft:#102f2b;
    --warn:#f5a524; --warn-soft:#3a2a0e;
    --ok:#4ade80; --ok-soft:#0f2f1c;
    --danger:#fb7185; --danger-soft:#3a1220;
  }
}
:root[data-theme="dark"]{
  --bg:#0a0f1c; --panel:#121b2e; --panel-2:#0f1728; --ink:#e7edf9; --ink-dim:#98a4c2; --line:#223049;
  --accent:#2dd4bf; --accent-ink:#062622; --accent-soft:#102f2b;
  --warn:#f5a524; --warn-soft:#3a2a0e;
  --ok:#4ade80; --ok-soft:#0f2f1c;
  --danger:#fb7185; --danger-soft:#3a1220;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--f-ar-body);line-height:1.75;-webkit-font-smoothing:antialiased}
#page{padding-inline:16px}
h1,h2,h3,h4{font-family:var(--f-ar-head);font-weight:700;text-wrap:balance;margin:0 0 .5em}
p{margin:0 0 1em;color:var(--ink)}
.dim{color:var(--ink-dim)}
a{color:var(--accent)}
.ltr,.mono,pre,code{direction:ltr;unicode-bidi:isolate;font-family:var(--mono)}
.wrap{max-width:980px;margin-inline:auto}
.wrap--wide{max-width:1120px}
img{max-width:100%}
[hidden]{display:none!important}

.topbar{position:sticky;top:0;z-index:40;background:color-mix(in srgb, var(--bg) 88%, transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar__inner{max-width:1120px;margin-inline:auto;padding:12px 16px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--f-ar-head);font-weight:700;font-size:1.05rem;white-space:nowrap}
.brand__mark{width:26px;height:26px;flex:none}
.pills{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.pills::-webkit-scrollbar{display:none}
.pills a{flex:none;padding:7px 13px;border-radius:999px;font-size:.85rem;color:var(--ink-dim);text-decoration:none;border:1px solid transparent;white-space:nowrap}
.pills a:hover{border-color:var(--line);color:var(--ink)}
.engine-badge{margin-inline-start:auto;font-family:var(--mono);font-size:.72rem;color:var(--ok);background:var(--ok-soft);padding:5px 10px;border-radius:999px;white-space:nowrap;display:flex;align-items:center;gap:6px}
.engine-badge.down{color:var(--danger);background:var(--danger-soft)}
.engine-badge .dot{width:6px;height:6px;border-radius:50%;background:currentColor}

.hero{padding:52px 0 34px}
.hero__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
@media (max-width:820px){.hero__grid{grid-template-columns:1fr}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.78rem;letter-spacing:.06em;color:var(--accent);background:var(--accent-soft);padding:5px 11px;border-radius:999px;margin-bottom:16px}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}
.hero h1{font-size:clamp(1.9rem,4.4vw,3rem);line-height:1.18}
.hero__lead{font-size:1.08rem;color:var(--ink-dim);max-width:52ch}
.hero__cta{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.hero__scope{margin-top:28px;display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:.78rem;font-family:var(--mono);color:var(--ink-dim);border:1px solid var(--line);padding:5px 10px;border-radius:8px}
.hero__visual{background:var(--code-bg);border-radius:18px;box-shadow:var(--shadow);padding:16px;border:1px solid var(--code-line)}
.hero__visual__bar{display:flex;justify-content:space-between;align-items:center;color:var(--code-dim);font-family:var(--mono);font-size:.72rem;margin-bottom:8px}
.hero__visual p{color:var(--code-dim);font-size:.86rem;margin:0}
.hero__visual .stack{display:flex;flex-direction:column;gap:8px}
.hero__visual .row{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.78rem;color:var(--code-ink);border-bottom:1px dashed var(--code-line);padding-bottom:6px}
.hero__visual .row b{color:var(--code-accent)}

.btn{font-family:var(--f-ar-head);font-weight:700;font-size:.88rem;border-radius:10px;padding:10px 18px;border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer}
.btn:active{transform:scale(.97)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--accent{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn--run{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);display:inline-flex;align-items:center;gap:8px}
.btn--run[disabled]{opacity:.6;cursor:progress}
.btn--ghost{background:transparent}

section{padding:34px 0}
.section-head{max-width:74ch;margin-bottom:20px}
.section-num{font-family:var(--mono);color:var(--accent);font-size:.82rem;letter-spacing:.05em}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:720px){.grid2{grid-template-columns:1fr}}

.eqcard{background:var(--panel-2);border:1px solid var(--line);border-inline-start:3px solid var(--accent);border-radius:10px;padding:18px 20px;margin:16px 0}
.eq{direction:ltr;unicode-bidi:isolate;font-family:var(--mono);font-size:1.06rem;text-align:center;overflow-x:auto;padding-block:2px}
.eqcap{margin-top:10px;font-size:.9rem;color:var(--ink-dim)}
.eqcap b{color:var(--ink);font-weight:600}

.fngrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.fncard{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:13px 14px}
.fncard code{color:var(--accent);font-weight:600;font-size:.86rem}
.fncard p{margin:.35em 0 0;font-size:.83rem;color:var(--ink-dim)}

.lab{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:22px;margin:18px 0;scroll-margin-top:80px}
.lab__badge{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:.74rem;color:var(--accent);background:var(--accent-soft);padding:4px 10px;border-radius:999px;margin-bottom:10px}
.lab__desc{color:var(--ink-dim);max-width:70ch;font-size:.95rem}
.lab__body{display:grid;grid-template-columns:.85fr 1.15fr;gap:18px;margin-top:16px}
.lab__body>*{min-width:0}
@media (max-width:900px){.lab__body{grid-template-columns:1fr}}
.controls{display:flex;flex-direction:column;gap:14px}
.field label{display:flex;justify-content:space-between;font-size:.82rem;color:var(--ink-dim);margin-bottom:6px}
.field label b{color:var(--ink);font-weight:600}
.field output{font-family:var(--mono);direction:ltr;color:var(--accent);font-weight:600}
input[type=range]{width:100%;accent-color:var(--accent)}
.seg{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.seg button{flex:1;border:0;background:var(--panel-2);color:var(--ink-dim);padding:8px 6px;font-family:var(--f-ar-body);font-size:.8rem;cursor:pointer;border-inline-start:1px solid var(--line)}
.seg button:first-child{border-inline-start:0}
.seg button.active{background:var(--accent);color:var(--accent-ink);font-weight:700}

.codepanel{background:var(--code-bg);border:1px solid var(--code-line);border-radius:12px;overflow:hidden}
.codepanel__bar{display:flex;align-items:center;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--code-line)}
.codepanel__tag{font-family:var(--mono);font-size:.72rem;color:var(--code-dim);display:flex;align-items:center;gap:7px}
.dots{display:flex;gap:5px}
.dots span{width:8px;height:8px;border-radius:50%;background:#f87171}
.dots span:nth-child(2){background:#fbbf24}
.dots span:nth-child(3){background:#34d399}
.copybtn{background:transparent;border:1px solid var(--code-line);color:var(--code-dim);border-radius:7px;padding:4px 9px;font-family:var(--mono);font-size:.72rem;cursor:pointer}
.copybtn:hover{color:var(--code-ink);border-color:var(--code-dim)}
.codepanel pre{margin:0;padding:14px 16px;overflow-x:auto;max-height:320px;font-size:.78rem;line-height:1.6;color:var(--code-ink)}
.c-kw{color:#c792ea}.c-fn{color:var(--code-accent)}.c-num{color:#f78c6c}.c-str{color:#addb67}.c-cm{color:var(--code-dim);font-style:italic}

.runrow{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}
.runrow .hint{font-size:.78rem;color:var(--ink-dim)}
.dirty-flag{font-size:.76rem;color:var(--warn);background:var(--warn-soft);padding:4px 9px;border-radius:999px;display:none;align-items:center;gap:5px}
.dirty-flag.show{display:inline-flex}

.outputgrid{display:grid;grid-template-columns:1.15fr .85fr;gap:14px;margin-top:16px}
@media (max-width:900px){.outputgrid{grid-template-columns:1fr}}
.plot-box{background:var(--panel-2);border:1px solid var(--line);border-radius:12px;padding:12px;min-height:180px;display:flex;align-items:center;justify-content:center;position:relative}
.plot-box img{width:100%;border-radius:6px;display:block}
.plot-box .placeholder{direction:ltr;color:var(--ink-dim);font-size:.85rem;font-family:var(--mono)}
.console-box{direction:ltr;unicode-bidi:isolate;text-align:left;background:var(--code-bg);border:1px solid var(--code-line);border-radius:12px;padding:12px 14px;font-family:var(--mono);font-size:.78rem;color:var(--code-ink);white-space:pre-wrap;min-height:180px;overflow-y:auto;max-height:280px}
.console-box .prompt{color:var(--code-accent)}
.console-box .err{color:#fb7185}

.spinner{width:15px;height:15px;border-radius:50%;border:2px solid rgba(255,255,255,.35);border-top-color:currentColor;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.note{margin-top:14px;border-radius:10px;padding:11px 14px;font-size:.86rem;display:flex;gap:9px;align-items:flex-start}
.note--ok{background:var(--ok-soft);color:var(--ok)}
.note--warn{background:var(--warn-soft);color:var(--warn)}
.note--err{background:var(--danger-soft);color:var(--danger)}
.note b{font-weight:700}

.refs{display:flex;flex-direction:column;gap:10px}
.ref{font-size:.85rem;color:var(--ink-dim);direction:ltr;text-align:left}
footer{border-top:1px solid var(--line);padding:30px 0 40px;margin-top:20px}
.disclaimer{background:var(--panel-2);border:1px dashed var(--line);border-radius:12px;padding:14px 16px;font-size:.84rem;color:var(--ink-dim)}

/* ---------------- User Badge in Topbar ---------------- */
.user-badge{display:flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;background:var(--panel);border:1px solid var(--line);font-size:.82rem;font-weight:600;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.04)}
.user-badge__icon{font-size:.9rem}
.user-badge__switch{background:none;border:none;color:var(--accent);cursor:pointer;font-size:.76rem;text-decoration:underline;padding:0;font-family:inherit}
.user-badge__switch:hover{opacity:.8}

/* ---------------- Modals (User Login & Admin) ---------------- */
.modal-overlay{position:fixed;inset:0;background:rgba(8,14,26,.72);backdrop-filter:blur(8px);z-index:9999;display:flex;align-items:center;justify-content:center;padding:16px;animation:modalFade .2s ease-out}
@keyframes modalFade{from{opacity:0;transform:scale(.98)}to{opacity:1;transform:scale(1)}}
.modal-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;max-width:440px;width:100%;padding:28px 24px;box-shadow:0 24px 48px -12px rgba(10,20,38,.35)}
.modal-header{text-align:center;margin-bottom:20px}
.modal-icon{width:54px;height:54px;border-radius:16px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;margin:0 auto 12px}
.modal-icon--admin{background:var(--warn-soft);color:var(--warn)}
.modal-header h2{font-size:1.35rem;margin:0 0 6px;color:var(--ink)}
.modal-sub{font-size:.88rem;color:var(--ink-dim);margin:0}

.user-choices{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.user-choice-card{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;border:2px solid var(--line);background:var(--panel-2);cursor:pointer;transition:all .15s ease}
.user-choice-card:hover{border-color:var(--accent);background:color-mix(in srgb, var(--accent-soft) 25%, var(--panel-2))}
.user-choice-card.selected{border-color:var(--accent);background:var(--accent-soft)}
.user-choice-card input[type="radio"]{display:none}
.choice-radio{width:18px;height:18px;border-radius:50%;border:2px solid var(--line);background:var(--panel);flex-none;display:flex;align-items:center;justify-content:center;transition:border-color .15s}
.user-choice-card.selected .choice-radio{border-color:var(--accent)}
.user-choice-card.selected .choice-radio::after{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent)}
.choice-content{display:flex;flex-direction:column;flex:1}
.choice-content--inline{flex-direction:row;align-items:center;gap:8px}
.choice-name{font-weight:700;font-size:1rem;color:var(--ink)}
.choice-role{font-size:.76rem;color:var(--ink-dim)}
.choice-prefix{font-weight:700;font-size:1rem;color:var(--ink)}
.custom-name-field{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:7px 10px;font-family:var(--f-ar-body);font-size:.9rem;color:var(--ink);flex:1;outline:none}
.custom-name-field:focus{border-color:var(--accent)}

.choice-error{background:var(--danger-soft);color:var(--danger);font-size:.82rem;padding:7px 12px;border-radius:8px;margin-bottom:14px;text-align:center}

.btn--wide{width:100%;justify-content:center;padding:12px 16px;font-size:1rem}
.btn--sm{padding:6px 14px;font-size:.82rem}
.btn--danger-ghost{background:transparent;border:1px solid var(--danger);color:var(--danger);border-radius:8px;cursor:pointer;font-family:inherit;font-weight:600}
.btn--danger-ghost:hover{background:var(--danger-soft)}

/* Admin Form & Password */
.admin-form .form-group{margin-bottom:14px}
.form-label{display:block;font-size:.84rem;font-weight:600;margin-bottom:6px;color:var(--ink)}
.password-wrap{display:flex;align-items:center;position:relative}
.admin-input{width:100%;padding:10px 40px 10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--panel-2);color:var(--ink);font-family:var(--mono);font-size:1rem;outline:none;direction:ltr}
.admin-input:focus{border-color:var(--warn)}
.toggle-pwd{position:absolute;left:8px;background:none;border:none;cursor:pointer;font-size:1.1rem;color:var(--ink-dim);padding:4px}
.modal-actions{display:flex;gap:10px}

/* ---------------- Admin Dashboard Overlay ---------------- */
.admin-dashboard-overlay{position:fixed;inset:0;background:var(--bg);z-index:10000;overflow-y:auto;padding:32px 20px}
.admin-dashboard-inner{max-width:1120px;margin:0 auto}
.admin-dashboard-header{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:24px;flex-wrap:wrap}
.admin-badge{display:inline-block;padding:4px 10px;border-radius:999px;background:var(--warn-soft);color:var(--warn);font-size:.76rem;font-weight:700;margin-bottom:6px}
.admin-dashboard-header h1{font-size:1.6rem;margin:0 0 4px}
.admin-subtitle{color:var(--ink-dim);font-size:.9rem;margin:0}
.admin-top-actions{display:flex;gap:8px;flex-wrap:wrap}

.admin-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-bottom:20px}
.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.stat-label{font-size:.78rem;color:var(--ink-dim)}
.stat-val{font-size:1.45rem;font-family:var(--mono);color:var(--ink);font-weight:700}
.stat-val--live{color:var(--ok)}

.admin-filter-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.admin-search{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:9px 14px;font-family:var(--f-ar-body);font-size:.9rem;color:var(--ink);width:320px;outline:none}
.admin-search:focus{border-color:var(--accent)}
.admin-refreshed-time{font-size:.78rem;color:var(--ink-dim);font-family:var(--mono)}

.admin-sessions-list{display:flex;flex-direction:column;gap:14px}
.session-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.session-header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:12px;flex-wrap:wrap;gap:10px}
.session-user-info{display:flex;align-items:center;gap:10px}
.session-avatar{width:36px;height:36px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem}
.session-user-name{font-size:1.05rem;font-weight:700;color:var(--ink)}
.session-status-badge{padding:3px 8px;border-radius:999px;font-size:.72rem;font-family:var(--mono)}
.session-status-badge--active{background:var(--ok-soft);color:var(--ok)}
.session-status-badge--ended{background:var(--panel-2);color:var(--ink-dim);border:1px solid var(--line)}

.session-metrics{display:flex;align-items:center;gap:16px;font-size:.82rem;color:var(--ink-dim)}
.session-metrics b{color:var(--ink);font-family:var(--mono)}

.session-activities-title{font-size:.82rem;font-weight:700;color:var(--ink-dim);margin:0 0 8px;display:flex;align-items:center;gap:6px}
.session-activities-list{display:flex;flex-direction:column;gap:6px;max-height:220px;overflow-y:auto;padding-inline-end:4px}
.session-activities-list::-webkit-scrollbar{width:5px}
.session-activities-list::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}

.activity-item{display:flex;align-items:center;gap:10px;padding:6px 10px;border-radius:8px;background:var(--panel-2);font-size:.84rem}
.activity-time{font-family:var(--mono);font-size:.74rem;color:var(--ink-dim);flex-none}
.activity-tag{padding:2px 7px;border-radius:6px;font-size:.72rem;font-weight:600;flex-none}
.activity-tag--run{background:var(--accent-soft);color:var(--accent)}
.activity-tag--nav{background:var(--panel);color:var(--ink-dim);border:1px solid var(--line)}
.activity-tag--login{background:var(--ok-soft);color:var(--ok)}
.activity-tag--param{background:var(--warn-soft);color:var(--warn)}
.activity-desc{color:var(--ink);flex:1}

.session-empty{padding:40px 20px;text-align:center;color:var(--ink-dim);font-size:.92rem;background:var(--panel);border:1px dashed var(--line);border-radius:14px}