:root {
    color-scheme: light dark;
    --bg: #f6f7f9;
    --panel: #ffffff;
    --ink: #101828;
    --muted: #667085;
    --line: #e4e7ec;
    --accent: #1d4ed8;
    --ok: #067647;
    --ok-bg: #ecfdf3;
    --warn: #b54708;
    --warn-bg: #fffaeb;
    --err: #b42318;
    --err-bg: #fef3f2;
    --side: #0f172a;
    --side-ink: #cbd5e1;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans Arabic", sans-serif;
    background: var(--bg);
    color: var(--ink);
    font-size: 14px;
}

.shell { display: flex; min-height: 100vh; }

/* ---------- sidebar ---------- */
.side {
    width: 232px;
    flex: 0 0 232px;
    background: var(--side);
    color: var(--side-ink);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 18px 18px 14px; border-bottom: 1px solid rgba(255,255,255,.08); }
.brand-mark { background: var(--accent); color: #fff; font-weight: 700; border-radius: 7px; padding: 4px 8px; font-size: 13px; letter-spacing: .5px; }
.brand-text { color: #fff; font-weight: 600; font-size: 13px; line-height: 1.25; }
.side nav { padding: 10px 8px; display: flex; flex-direction: column; gap: 2px; flex: 1; overflow-y: auto; }
.side nav a {
    color: var(--side-ink); text-decoration: none; padding: 8px 11px; border-radius: 7px;
    display: flex; align-items: center; justify-content: space-between; font-size: 13.5px;
}
.side nav a:hover { background: rgba(255,255,255,.07); color: #fff; }
.side nav a.on { background: var(--accent); color: #fff; font-weight: 500; }
.pill { background: var(--err); color: #fff; border-radius: 999px; font-size: 11px; padding: 1px 7px; font-weight: 600; }
.side-foot { padding: 12px 16px 16px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; }
.side-foot .who { color: #fff; font-weight: 500; }
.side-foot .role { color: #94a3b8; margin: 2px 0 8px; text-transform: capitalize; }
.signout { color: #94a3b8; text-decoration: none; font-size: 12px; }
.signout:hover { color: #fff; text-decoration: underline; }

/* ---------- main ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
    background: var(--panel); border-bottom: 1px solid var(--line);
    padding: 14px 24px; display: flex; align-items: center; justify-content: space-between;
    position: sticky; top: 0; z-index: 5;
}
.topbar h1 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.gw { font-size: 12px; padding: 3px 10px; border-radius: 999px; font-weight: 500; }
.gw.up { background: var(--ok-bg); color: var(--ok); }
.gw.down { background: var(--err-bg); color: var(--err); }
.content { padding: 22px 24px 60px; }

/* ---------- tiles ---------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(165px, 1fr)); gap: 12px; margin-bottom: 20px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.tile .k { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .06em; }
.tile .v { font-size: 25px; font-weight: 600; margin-top: 5px; letter-spacing: -.02em; }
.tile .s { color: var(--muted); font-size: 12px; margin-top: 3px; }
.tile.ok  .v { color: var(--ok); }
.tile.warn .v { color: var(--warn); }
.tile.err .v { color: var(--err); }

/* ---------- panels & tables ---------- */
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; margin-bottom: 20px; overflow: hidden; }
.panel > h2 {
    margin: 0; padding: 13px 16px; font-size: 14px; font-weight: 600;
    border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.panel-body { padding: 16px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #fafbfc; font-weight: 600; color: var(--muted); font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafbfc; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.empty { padding: 34px 16px; text-align: center; color: var(--muted); }

/* ---------- badges ---------- */
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11.5px; font-weight: 500; white-space: nowrap; }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.err { background: var(--err-bg); color: var(--err); }
.badge.mute { background: #f2f4f7; color: var(--muted); }
.badge.mode { background: #eef4ff; color: var(--accent); }

/* ---------- forms ---------- */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field.wide { grid-column: 1 / -1; }
label { font-size: 12px; color: var(--muted); font-weight: 500; }
input[type=text], input[type=password], input[type=number], input[type=date], select, textarea {
    font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 7px;
    background: #fff; color: var(--ink); width: 100%;
}
textarea { min-height: 76px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; }
input:focus, select:focus, textarea:focus { outline: 2px solid #bfdbfe; border-color: var(--accent); }
.hint { font-size: 11.5px; color: var(--muted); }

.btn {
    font: inherit; font-weight: 500; padding: 8px 14px; border-radius: 7px; border: 1px solid var(--line);
    background: #fff; color: var(--ink); cursor: pointer; text-decoration: none; display: inline-block;
}
.btn:hover { background: #f8fafc; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #1e40af; }
.btn.danger { color: var(--err); border-color: #fecdca; }
.btn.danger:hover { background: var(--err-bg); }
.btn.small { padding: 4px 9px; font-size: 12px; }
.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 16px; }

.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.filters .field { min-width: 130px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 13px; }
.flash.ok { background: var(--ok-bg); color: var(--ok); }
.flash.err { background: var(--err-bg); color: var(--err); }
.flash.warn { background: var(--warn-bg); color: var(--warn); }

code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; }
.muted { color: var(--muted); }
.screen {
    white-space: pre-wrap; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    background: #0f172a; color: #e2e8f0; padding: 12px 14px; border-radius: 8px; font-size: 13px; line-height: 1.5;
}
.screen:dir(rtl) { text-align: right; }
.pager { display: flex; gap: 8px; align-items: center; justify-content: flex-end; padding: 12px 16px; border-top: 1px solid var(--line); font-size: 13px; }

/* ---------- login ---------- */
.login-wrap { display: flex; min-height: 100vh; align-items: center; justify-content: center; background: var(--side); }
.login-card { background: var(--panel); border-radius: 12px; padding: 30px; width: 340px; box-shadow: 0 20px 50px rgba(0,0,0,.3); }
.login-card h1 { font-size: 17px; margin: 0 0 4px; }
.login-card p.sub { color: var(--muted); font-size: 13px; margin: 0 0 20px; }
.login-card .field { margin-bottom: 14px; }
.login-card .btn { width: 100%; text-align: center; }

/* ---------- tree builder ---------- */
.tree { list-style: none; margin: 0; padding: 0; }
.tree ul { list-style: none; margin: 0; padding-left: 22px; border-left: 1px dashed var(--line); }
.tree li { padding: 3px 0; }
.node-row { display: flex; align-items: center; gap: 8px; padding: 6px 9px; border-radius: 7px; }
.node-row:hover { background: #f8fafc; }
.node-key { background: #0f172a; color: #fff; border-radius: 5px; padding: 1px 7px; font-size: 11.5px; font-family: ui-monospace, monospace; }
.node-code { font-weight: 500; }
.node-type { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.node-text { color: var(--muted); font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 320px; }
.node-actions { margin-left: auto; display: flex; gap: 6px; opacity: 0; }
.node-row:hover .node-actions { opacity: 1; }

.sim-phone { background: #0f172a; border-radius: 14px; padding: 14px; }
.sim-screen { background: #0b1220; color: #d1fae5; border-radius: 8px; padding: 14px; min-height: 130px; white-space: pre-wrap; font-family: ui-monospace, monospace; font-size: 13px; line-height: 1.55; }
.sim-input { display: flex; gap: 8px; margin-top: 10px; }
.sim-input input { flex: 1; }

.two-col { display: grid; grid-template-columns: 1.6fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 980px) { .two-col { grid-template-columns: 1fr; } }

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1120; --panel: #111827; --ink: #e5e7eb; --muted: #9aa4b2; --line: #1f2937;
        --ok-bg: #052e1d; --warn-bg: #2e1c05; --err-bg: #2e0f0c;
    }
    th { background: #0f1623; }
    tbody tr:hover { background: #0f1623; }
    input, select, textarea { background: #0b1120; }
    .btn { background: #0f1623; }
    .btn:hover { background: #16202f; }
}