:root {
    --bg: #f4f5f7;
    --panel: #ffffff;
    --border: #dfe3e8;
    --text: #16181d;
    --muted: #6b7280;
    --accent: #8a6d3b;
    --accent-strong: #6d5530;
    --ok-bg: #e8f5ec;
    --ok-text: #1c6b3a;
    --err-bg: #fdeaea;
    --err-text: #a32626;
    --warn-bg: #fff6e0;
    --warn-text: #8a6116;
    --code-bg: #f7f5f0;
    --radius: 10px;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg: #14161a;
      --panel: #1c1f25;
      --border: #2e333c;
      --text: #eceef2;
      --muted: #98a0ad;
      --accent: #c9a86a;
      --accent-strong: #dcc08c;
      --ok-bg: #14301f;
      --ok-text: #7fd6a0;
      --err-bg: #3a1a1a;
      --err-text: #f19a9a;
      --warn-bg: #35290f;
      --warn-text: #e5c37c;
      --code-bg: #14171c;
    }
  }

  * { box-sizing: border-box; }
  body {
    margin: 0;
    padding: 24px 16px 64px;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", Tahoma, "Noto Naskh Arabic", system-ui, sans-serif;
    line-height: 1.7;
  }
  .wrap { max-width: 760px; margin: 0 auto; }

  header { text-align: center; margin-bottom: 28px; }
  header h1 { margin: 0 0 4px; font-size: 1.5rem; letter-spacing: -.01em; }
  header p { margin: 0; color: var(--muted); font-size: .9rem; }

  .card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 18px;
  }
  .card h2 {
    margin: 0 0 16px;
    font-size: 1.05rem;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
  }

  label { display: block; margin: 14px 0 6px; font-size: .875rem; font-weight: 600; }
  label .hint { font-weight: 400; color: var(--muted); }

  input, textarea, button {
    font-family: inherit;
    font-size: 1rem;
  }
  input, textarea {
    width: 100%;
    padding: 11px 13px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
  }
  input:focus, textarea:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
    border-color: transparent;
  }
  input.ltr { direction: ltr; text-align: left; font-family: ui-monospace, Consolas, monospace; letter-spacing: .04em; }
  textarea { direction: ltr; text-align: left; font-family: ui-monospace, Consolas, monospace; min-height: 90px; resize: vertical; font-size: .8rem; }

  button {
    padding: 11px 20px;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
  }
  button:hover:not(:disabled) { background: var(--accent-strong); }
  button:disabled { opacity: .55; cursor: not-allowed; }
  button.ghost {
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--border);
    font-weight: 600;
    padding: 8px 14px;
    font-size: .85rem;
  }
  button.ghost:hover:not(:disabled) { background: var(--bg); color: var(--text); }

  .row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
  .row.split { justify-content: space-between; }
  .row.tight { margin-top: 0; }

  .msg { padding: 11px 14px; border-radius: 8px; font-size: .875rem; margin-top: 14px; }
  .msg.ok   { background: var(--ok-bg);   color: var(--ok-text); }
  .msg.err  { background: var(--err-bg);  color: var(--err-text); }
  .msg.warn { background: var(--warn-bg); color: var(--warn-text); }

  .keybox {
    margin-top: 16px;
    background: var(--code-bg);
    border: 1px dashed var(--accent);
    border-radius: 8px;
    padding: 14px;
    direction: ltr;
    text-align: left;
    font-family: ui-monospace, Consolas, monospace;
    font-size: .78rem;
    word-break: break-all;
    line-height: 1.6;
    user-select: all;
  }

  .meta { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 12px; font-size: .82rem; color: var(--muted); }
  .meta b { color: var(--text); font-weight: 600; }

  table { width: 100%; border-collapse: collapse; font-size: .82rem; }
  th, td { text-align: right; padding: 9px 8px; border-bottom: 1px solid var(--border); }
  th { color: var(--muted); font-weight: 600; }
  td.mono { direction: ltr; text-align: left; font-family: ui-monospace, Consolas, monospace; }

  .hidden { display: none !important; }
  footer { text-align: center; color: var(--muted); font-size: .78rem; margin-top: 26px; }
  .scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

  /* ---------- التبويبات ---------- */
  .tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 18px;
    overflow-x: auto;
    padding-bottom: 4px;
  }
  .tab {
    flex: 0 0 auto;
    background: var(--panel);
    color: var(--muted);
    border: 1px solid var(--border);
    font-size: .85rem;
    font-weight: 600;
    padding: 9px 16px;
    white-space: nowrap;
  }
  .tab:hover:not(.active) { color: var(--text); }
  .tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
  }

  /* ---------- عناصر مساعدة ---------- */
  .grow { flex: 1 1 200px; min-width: 0; }
  button.tiny { padding: 5px 10px; font-size: .75rem; }
  h2.sub { margin-top: 26px; }
  .note { color: var(--muted); font-size: .8rem; margin: 0; }
  .footer-row { align-items: center; }

  td.good  { color: var(--ok-text);   font-weight: 600; }
  td.bad   { color: var(--err-text);  font-weight: 600; }
  td.warnText { color: var(--warn-text); font-weight: 600; }

  /* ---------- الهاتف ---------- */
  @media (max-width: 640px) {
    body { padding: 16px 10px 48px; }
    .card { padding: 16px; }
    header h1 { font-size: 1.25rem; }
    table { font-size: .76rem; }
    th, td { padding: 7px 5px; }
    .tab { padding: 8px 13px; font-size: .8rem; }
    .keybox { font-size: .68rem; }
    button { width: 100%; }
    button.tiny, .tab { width: auto; }
    .row > button.ghost { width: auto; }
  }