/* ===== Palo Alto NGFW-Engineer Quiz — Styles ===== */
:root {
  --accent: #fa582d;           /* Palo Alto orange */
  --accent-dark: #d8401a;
  --accent-soft: #fff1ec;
  --ok: #1f9d55;
  --ok-soft: #e7f6ee;
  --bad: #e53935;
  --bad-soft: #fdecea;
  --flag: #f5a623;
  --bg: #f4f6f9;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --text: #1c2430;
  --muted: #6b7785;
  --border: #e4e9f0;
  --shadow: 0 1px 3px rgba(16,24,40,.06), 0 1px 2px rgba(16,24,40,.04);
  --shadow-lg: 0 10px 30px rgba(16,24,40,.10);
  --radius: 14px;
  --radius-sm: 9px;
}
[data-theme="dark"] {
  --accent: #ff6a3d;
  --accent-dark: #ff7e57;
  --accent-soft: #2a1d16;
  --ok: #36c97f;
  --ok-soft: #16291f;
  --bad: #ff6b6b;
  --bad-soft: #2a1718;
  --flag: #ffb84d;
  --bg: #0e1117;
  --panel: #161b22;
  --panel-2: #1b212b;
  --text: #e6edf3;
  --muted: #9aa6b2;
  --border: #2a313c;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
  --shadow-lg: 0 14px 40px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.appbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.appbar-inner {
  max-width: 1280px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; margin-right: auto; }
.brand .logo {
  width: 40px; height: 40px; border-radius: 11px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 18px;
  box-shadow: 0 4px 12px rgba(250,88,45,.35);
}
.brand h1 { font-size: 17px; margin: 0; line-height: 1.2; }
.brand .sub { font-size: 12px; color: var(--muted); }

.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.seg {
  display: inline-flex; background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px; gap: 2px;
}
.seg button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 12px; border-radius: 999px; cursor: pointer; font-size: 13px; font-weight: 600;
  transition: .15s;
}
.seg button:hover { color: var(--text); }
.seg button.active { background: var(--accent); color: #fff; box-shadow: 0 2px 6px rgba(250,88,45,.35); }

.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); cursor: pointer; font-size: 16px;
  display: grid; place-items: center; transition: .15s;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Layout ===== */
.wrap { max-width: 1280px; margin: 0 auto; padding: 20px; display: grid;
  grid-template-columns: 300px 1fr; gap: 20px; align-items: start; }
@media (max-width: 920px) {
  .wrap { grid-template-columns: 1fr; }
  .wrap > section { order: 1; }   /* question first on mobile */
  .sidebar { order: 2; }          /* stats + palette below the question */
}

.sidebar { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 16px; }
@media (max-width: 920px) {
  .sidebar { position: static; }
  .sidebar.collapsed .palette-body, .sidebar.collapsed .legend { display: none; }
}

/* ===== Phone-sized screens ===== */
@media (max-width: 560px) {
  .appbar-inner { padding: 10px 12px; gap: 8px; }
  .brand .sub { display: none; }
  .brand h1 { font-size: 15px; }
  .brand .logo { width: 34px; height: 34px; font-size: 16px; }
  .controls { gap: 8px; }
  .seg button { padding: 6px 10px; font-size: 12.5px; }
  .icon-btn { width: 34px; height: 34px; font-size: 15px; }
  .wrap { padding: 12px; gap: 14px; }
  .qhead { padding: 14px 16px; }
  .qbody { padding: 16px; }
  .qtext { font-size: 15.5px; }
  .opt { padding: 12px 13px; }
  .qactions, .footer-nav { padding-left: 16px; padding-right: 16px; }
  .explain { margin-left: 16px; margin-right: 16px; }
  .result-line { padding-left: 16px; padding-right: 16px; }
  .stats { gap: 8px; }
  .stat .v { font-size: 18px; }
  .palette-grid { max-height: 260px; }
  .btn { padding: 10px 15px; }
}
/* Avoid sticky :hover highlight after tap on touch devices */
@media (hover: none) {
  .opt:hover { background: var(--panel); border-color: var(--border); }
  .opt.selected:hover { background: var(--accent-soft); border-color: var(--accent); }
}

.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); }
.card .card-h { padding: 14px 16px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px; }
.card .card-h h2 { font-size: 14px; margin: 0; }
.card .card-b { padding: 16px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.stat { background: var(--panel-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px; text-align: center; }
.stat .v { font-size: 20px; font-weight: 800; line-height: 1; }
.stat .k { font-size: 11px; color: var(--muted); margin-top: 4px; }
.stat.ok .v { color: var(--ok); }
.stat.bad .v { color: var(--bad); }

.progress { height: 8px; border-radius: 999px; background: var(--panel-2);
  overflow: hidden; border: 1px solid var(--border); margin-top: 12px; }
.progress > i { display: block; height: 100%; background: linear-gradient(90deg,var(--accent),var(--accent-dark)); width: 0; transition: width .3s; }

/* Palette */
.filters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.chip { border: 1px solid var(--border); background: var(--panel-2); color: var(--muted);
  border-radius: 999px; padding: 4px 10px; font-size: 12px; cursor: pointer; font-weight: 600; }
.chip.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
[data-theme="dark"] .chip.active { color: var(--accent); }

.palette-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(34px,1fr));
  gap: 6px; max-height: 360px; overflow: auto; }
.pcell { aspect-ratio: 1; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); cursor: pointer; font-size: 12px; font-weight: 700;
  display: grid; place-items: center; position: relative; transition: .12s; }
.pcell:hover { border-color: var(--accent); transform: translateY(-1px); }
.pcell.current { outline: 2px solid var(--accent); outline-offset: 1px; }
.pcell.correct { background: var(--ok-soft); color: var(--ok); border-color: var(--ok); }
.pcell.incorrect { background: var(--bad-soft); color: var(--bad); border-color: var(--bad); }
.pcell.answered { background: #e9eef5; }
[data-theme="dark"] .pcell.answered { background: #232b36; }
.pcell.flagged::after { content: ""; position: absolute; top: 2px; right: 2px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--flag); }

.legend { display: flex; flex-wrap: wrap; gap: 10px; font-size: 11px; color: var(--muted); margin-top: 10px; }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.legend i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; border: 1px solid var(--border); }
.legend i.c { background: var(--ok-soft); border-color: var(--ok); }
.legend i.w { background: var(--bad-soft); border-color: var(--bad); }
.legend i.a { background: #e9eef5; }
.legend i.f { background: var(--flag); border: 0; border-radius: 50%; }

/* ===== Question card ===== */
.q-toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.q-toolbar .search { flex: 1; min-width: 160px; position: relative; }
.q-toolbar .search input { width: 100%; padding: 9px 12px 9px 34px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); font-size: 14px; }
.q-toolbar .search::before { content: "🔍"; position: absolute; left: 11px; top: 50%; transform: translateY(-50%); font-size: 13px; opacity: .6; }

.qcard { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden; }
.qhead { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: flex-start; gap: 12px; }
.qnum { background: var(--accent); color: #fff; font-weight: 800; border-radius: 10px;
  padding: 6px 11px; font-size: 14px; white-space: nowrap; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.badge { font-size: 11px; font-weight: 700; padding: 4px 9px; border-radius: 999px;
  background: var(--panel-2); color: var(--muted); border: 1px solid var(--border); }
.badge.multi { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.badge.flagbtn { cursor: pointer; }
.badge.flagbtn.on { background: var(--flag); color: #fff; border-color: var(--flag); }

.qbody { padding: 20px; }
.qtext { font-size: 16.5px; font-weight: 600; margin: 0 0 4px; white-space: pre-wrap; }
.qtext .zh { display: block; font-weight: 600; }
.qtext .en { display: block; }
/* bilingual: English on top (primary), Chinese below (translation) */
.dual .qtext .en { color: var(--text); }
.dual .qtext .zh { color: var(--muted); font-weight: 500; font-size: 15px;
  margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--border); }

.options { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-direction: column; gap: 10px; }
.opt { display: flex; gap: 12px; align-items: flex-start; padding: 13px 15px; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; background: var(--panel); transition: .14s; user-select: none; }
.opt:hover { border-color: var(--accent); background: var(--accent-soft); }
.opt .letter { width: 26px; height: 26px; border-radius: 7px; border: 1.5px solid var(--border);
  display: grid; place-items: center; font-weight: 800; font-size: 13px; flex: 0 0 auto; color: var(--muted); }
.opt .otext { flex: 1; }
.opt .otext .en { display: block; }
.opt .otext .zh { display: block; }
.dual .opt .otext .zh { color: var(--muted); font-size: 13.5px; margin-top: 3px; }
.opt.selected { border-color: var(--accent); background: var(--accent-soft); }
.opt.selected .letter { background: var(--accent); color: #fff; border-color: var(--accent); }

/* graded states */
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.correct .letter { background: var(--ok); color: #fff; border-color: var(--ok); }
.opt.incorrect { border-color: var(--bad); background: var(--bad-soft); }
.opt.incorrect .letter { background: var(--bad); color: #fff; border-color: var(--bad); }
.opt.locked { cursor: default; }
.opt.locked:hover { background: var(--panel); }
.opt.correct.locked:hover { background: var(--ok-soft); }
.opt.incorrect.locked:hover { background: var(--bad-soft); }
.opt .mark { margin-left: auto; font-weight: 800; align-self: center; }
.opt.correct .mark { color: var(--ok); }
.opt.incorrect .mark { color: var(--bad); }

/* actions */
.qactions { display: flex; gap: 10px; align-items: center; padding: 0 20px 20px; flex-wrap: wrap; }
.btn { border: 0; border-radius: 10px; padding: 10px 18px; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: .15s; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 12px rgba(250,88,45,.3); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; }
.spacer { margin-left: auto; }

/* explanation */
.explain { margin: 0 20px 20px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--panel-2); overflow: hidden; }
.explain.hidden { display: none; }
.explain .eh { padding: 11px 15px; font-weight: 700; font-size: 13.5px; display: flex; align-items: center; gap: 8px;
  cursor: pointer; }
.explain .eh .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.explain .eb { padding: 0 16px 16px; font-size: 14px; white-space: pre-wrap; }
.explain .eb .en { white-space: pre-wrap; color: var(--text); }
.explain .eb .zh { white-space: pre-wrap; }
.dual .explain .eb .zh { color: var(--muted); margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--border); }
.result-line { padding: 12px 20px; font-weight: 700; font-size: 14px; display: none; align-items: center; gap: 8px; }
.result-line.show { display: flex; }
.result-line.win { color: var(--ok); }
.result-line.lose { color: var(--bad); }

.footer-nav { display: flex; gap: 10px; align-items: center; padding: 16px 20px; border-top: 1px solid var(--border); }
.footer-nav .pos { margin: 0 auto; color: var(--muted); font-size: 13px; }

/* exam summary */
.summary { padding: 28px; text-align: center; }
.summary .score-ring { width: 150px; height: 150px; margin: 0 auto 16px; }
.summary h2 { margin: 6px 0; }
.summary .big { font-size: 44px; font-weight: 800; }
.summary p { color: var(--muted); }
.hidden { display: none !important; }

.empty { text-align: center; padding: 50px 20px; color: var(--muted); }

kbd { background: var(--panel-2); border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 6px; padding: 1px 6px; font-size: 12px; font-family: inherit; }

.toast { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 10px; font-size: 14px;
  font-weight: 600; opacity: 0; pointer-events: none; transition: .25s; z-index: 100; box-shadow: var(--shadow-lg); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.help { font-size: 12px; color: var(--muted); line-height: 1.9; }
.help kbd { margin: 0 2px; }