/* Rust Build Challenges — extends shell.css */

/* ── Highlight tokens (used by rbFormat) ── */
.rb-hl, .rb-hl-text, strong.rb-hl { color: #ff8a96; font-weight: 800; }
[data-theme="light"] .rb-hl, [data-theme="light"] strong.rb-hl { color: #c0392b; }
.rb-cmd, code.rb-cmd {
  background: rgba(0, 212, 255, .12) !important;
  border-color: rgba(0, 212, 255, .35) !important;
  color: var(--accent-2) !important;
  font-weight: 700;
}

/* ── Layout ── */
.rb-hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.rb-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px; margin: 20px 0;
}

/* ── Category cards ── */
.rb-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: linear-gradient(165deg, var(--card), var(--card-2));
  padding: 20px; box-shadow: var(--shadow); text-decoration: none; color: var(--text);
  display: block; transition: transform .15s, border-color .15s, box-shadow .15s;
  position: relative; overflow: hidden;
}
.rb-card::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2)); opacity: .6;
}
.rb-card:hover {
  text-decoration: none; transform: translateY(-3px);
  border-color: var(--accent); box-shadow: 0 14px 40px rgba(124, 92, 255, .2);
}
.rb-serial {
  position: absolute; top: 14px; right: 14px;
  font-size: 11px; font-weight: 900; letter-spacing: .08em;
  padding: 4px 10px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
}
.rb-card h4 { margin: 10px 0 8px; font-size: 18px; line-height: 1.25; }
.rb-card p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.55; }
.rb-card .rb-icon { font-size: 30px; margin-bottom: 4px; }
.rb-card .rb-meta { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.rb-tag {
  font-size: 11px; font-weight: 700; padding: 4px 10px; border-radius: 999px;
  background: var(--tag); color: var(--accent-2); text-transform: uppercase; letter-spacing: .05em;
}
.rb-tag.salary { background: rgba(46, 204, 113, .12); color: var(--good); border: 1px solid rgba(46, 204, 113, .25); }

/* ── Difficulty badges ── */
.diff-hard, .rb-diff.diff-hard, .pill.diff-hard { background: rgba(255, 93, 108, .15) !important; color: #ff8a96 !important; border: 1px solid rgba(255, 93, 108, .3); }
.diff-mid, .rb-diff.diff-mid, .pill.diff-mid { background: rgba(255, 176, 32, .15) !important; color: var(--warn) !important; border: 1px solid rgba(255, 176, 32, .3); }
.rb-diff {
  font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em;
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
}

/* ── Project cards (category page) ── */
.rb-project-card {
  border: 1px solid var(--border); border-radius: 14px;
  background: linear-gradient(180deg, var(--card), var(--bg-soft));
  padding: 18px 20px; margin: 14px 0; box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
}
.rb-pc-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.rb-project-card h4 { margin: 0; font-size: 17px; flex: 1; }
.rb-proj-num {
  display: inline-block; font-size: 11px; font-weight: 900; margin-right: 6px;
  padding: 3px 8px; border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
}
.rb-project-card .sub { color: var(--muted); font-size: 13.5px; margin: 8px 0; }
.tagline-line { color: var(--text) !important; font-weight: 500; }
.rb-pc-meta { display: flex; gap: 14px; font-size: 12px; color: var(--accent-2); font-weight: 600; margin-bottom: 10px; }
.rb-project-card .features { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.rb-project-card .feat {
  font-size: 11px; font-weight: 600; padding: 4px 9px; border-radius: 6px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
}
.rb-project-card .feat.more { color: var(--muted); font-style: italic; }
.rb-project-card a.btn-start {
  display: inline-block; margin-top: 10px; padding: 10px 18px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
  font-weight: 800; font-size: 13px; text-decoration: none;
  box-shadow: 0 4px 16px rgba(124, 92, 255, .35);
}
.rb-project-card a.btn-start:hover { opacity: .92; text-decoration: none; transform: translateY(-1px); }

/* ── Panels (overview, companies, howto, features) ── */
.rb-panel {
  margin: 20px 0; padding: 0; border: 1px solid var(--border); border-radius: 16px;
  background: var(--card); box-shadow: var(--shadow); overflow: hidden;
}
.rb-panel-head {
  display: flex; align-items: center; gap: 10px;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  background: linear-gradient(90deg, rgba(124, 92, 255, .12), transparent);
}
.rb-panel-icon { font-size: 20px; }
.rb-panel-head h5 {
  margin: 0; font-size: 15px; font-weight: 800; color: var(--text);
  text-transform: none; letter-spacing: 0;
}
.rb-panel-sub { margin: 0; padding: 14px 20px 0; font-size: 13.5px; color: var(--muted); line-height: 1.55; }
.rb-panel-overview .rb-overview-body { padding: 16px 20px 8px; }
.rb-para { margin: 0 0 12px; font-size: 14.5px; line-height: 1.75; color: var(--text); max-width: none; }
.rb-para-lead {
  padding: 12px 14px; border-radius: 10px; margin-bottom: 14px !important;
  background: rgba(124, 92, 255, .08); border-left: 3px solid var(--accent);
}

/* ── Highlight stat cards ── */
.rb-highlights {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px; padding: 14px 20px; border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
.rb-hl-card {
  display: flex; flex-direction: column; gap: 2px;
  padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--card);
}
.rb-hl-card .ico { font-size: 16px; }
.rb-hl-card .lbl { font-size: 10px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; }
.rb-hl-card strong { font-size: 14px; color: var(--accent-2); }
.rb-tagline-box {
  margin: 0 20px 18px; padding: 12px 16px; border-radius: 10px;
  background: var(--bg-soft); border: 1px dashed var(--border);
}
.rb-tagline-box .lbl { font-size: 10px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); font-weight: 700; }
.rb-tagline-box p { margin: 6px 0 0; font-size: 14px; font-weight: 600; color: var(--text); }

/* ── Companies ── */
.rb-panel-companies .rb-company-list { padding: 16px 20px 20px; }
.rb-company-list { display: flex; flex-wrap: wrap; gap: 10px; }
.rb-company {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; padding: 10px 16px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(124, 92, 255, .18), rgba(0, 212, 255, .1));
  border: 1px solid rgba(124, 92, 255, .3); color: var(--text);
  transition: transform .12s, border-color .12s;
}
.rb-company:hover { transform: translateY(-2px); border-color: var(--accent-2); }
.rb-company .co-num {
  width: 22px; height: 22px; border-radius: 6px; font-size: 11px; font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
  display: grid; place-items: center; flex-shrink: 0;
}
.rb-card-companies { margin: 10px 0; }
.rb-card-companies .lbl {
  display: block; font-size: 10px; text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted); font-weight: 700; margin-bottom: 6px;
}
.co-chip {
  font-size: 11px; font-weight: 600; padding: 4px 9px; border-radius: 6px;
  background: rgba(124, 92, 255, .12); border: 1px solid rgba(124, 92, 255, .25);
  color: var(--accent-2);
}

/* ── How-to steps ── */
.rb-panel-howto .rb-steps {
  margin: 0; padding: 16px 20px 20px 36px; list-style: none; counter-reset: rbstep;
}
.rb-steps li {
  counter-increment: rbstep; position: relative;
  margin: 0 0 12px; padding: 12px 14px 12px 12px; border-radius: 10px;
  background: var(--bg-soft); border: 1px solid var(--border);
  font-size: 14px; line-height: 1.6; color: var(--text);
}
.rb-steps li::before {
  content: counter(rbstep); position: absolute; left: -28px; top: 12px;
  width: 22px; height: 22px; border-radius: 50%; font-size: 11px; font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
  display: grid; place-items: center;
}

/* ── Features grid ── */
.rb-panel-features { padding-bottom: 8px; }
.rb-feature-grid {
  list-style: none; margin: 0; padding: 12px 20px 18px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 8px;
}
.rb-feature-grid li {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px; border-radius: 10px; background: var(--bg-soft);
  border: 1px solid var(--border); font-size: 13.5px; line-height: 1.45;
}
.feat-num {
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 6px; font-size: 11px; font-weight: 900;
  background: rgba(46, 204, 113, .15); color: var(--good); border: 1px solid rgba(46, 204, 113, .3);
  display: grid; place-items: center;
}

/* ── Stages ── */
.rb-stages-section { margin-top: 32px; }
.rb-stage {
  border: 1px solid var(--border); border-radius: 16px; background: var(--card);
  padding: 0; margin: 18px 0; overflow: hidden;
  border-left: 4px solid var(--accent);
  box-shadow: var(--shadow);
}
.rb-stage-head { padding: 18px 20px 10px; border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.rb-stage .stage-num {
  display: inline-block; font-weight: 900; font-size: 10px; letter-spacing: .14em;
  padding: 4px 10px; border-radius: 999px; text-transform: uppercase;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b1020;
  margin-bottom: 8px;
}
.rb-stage h4 { margin: 0; font-size: 18px; font-weight: 800; color: var(--text); }
.rb-stage-goal {
  padding: 14px 20px; font-size: 14.5px; line-height: 1.65; color: var(--text);
  border-bottom: 1px solid var(--border); background: rgba(124, 92, 255, .04);
}
.rb-stage-tip {
  margin: 0; padding: 12px 20px; font-size: 13.5px; line-height: 1.6;
  color: var(--muted); background: rgba(255, 176, 32, .06);
  border-bottom: 1px solid var(--border); border-left: 3px solid var(--warn);
}
.rb-crate-row { padding: 12px 20px 4px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.rb-crate-label, .rb-code-label {
  font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--muted);
}
.rb-crate-row .crates { display: flex; flex-wrap: wrap; gap: 6px; }
.crate-pill {
  font-family: ui-monospace, Menlo, monospace; font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: 8px;
  background: rgba(0, 212, 255, .1); border: 1px solid rgba(0, 212, 255, .25); color: var(--accent-2);
}
.rb-code-wrap { padding: 8px 20px 16px; position: relative; }
.rb-code-wrap .rb-code-label { position: absolute; top: 16px; right: 28px; z-index: 1; }
pre.code.rust {
  background: #0a0f24; color: #e6e9ff; border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px; font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12.5px; line-height: 1.6; overflow: auto; margin: 0;
  border-top: 3px solid var(--accent-2);
}
[data-theme="light"] pre.code.rust { background: #0d1330; }
.rb-stage .verify {
  display: flex; gap: 12px; align-items: flex-start;
  margin: 0; padding: 14px 20px; border-top: 1px solid var(--border);
  background: rgba(46, 204, 113, .06); font-size: 13.5px;
}
.rb-stage .verify .verify-icon {
  width: 28px; height: 28px; border-radius: 8px; flex-shrink: 0;
  background: rgba(46, 204, 113, .2); color: var(--good); font-weight: 900;
  display: grid; place-items: center; font-size: 14px;
}
.rb-stage .verify b { display: block; color: var(--good); margin-bottom: 4px; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.rb-stage .verify p { margin: 0; color: var(--text); line-height: 1.5; }

/* ── Misc ── */
.rb-breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.rb-breadcrumb a { color: var(--accent-2); }
.rb-breadcrumb strong { color: var(--text); }
.rb-jobs {
  margin: 16px 0; padding: 14px 18px; border-left: 4px solid var(--accent);
  background: linear-gradient(90deg, rgba(124, 92, 255, .1), transparent);
  border-radius: 0 12px 12px 0; font-size: 14px; line-height: 1.55;
}
.rb-jobs b { color: var(--accent-2); }
.rb-workflow {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px; margin: 20px 0;
}
.rb-workflow .step {
  padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px;
  background: var(--card); font-size: 13px; line-height: 1.5;
}
.rb-workflow .step b { display: block; margin-bottom: 6px; color: var(--accent-2); font-size: 13px; }
.rb-project-hero h2 { font-size: clamp(24px, 4vw, 36px); }
.hero-tagline { font-size: 16px !important; font-weight: 500 !important; color: var(--text) !important; }
.salary-pill { background: rgba(46, 204, 113, .12) !important; color: var(--good) !important; }

@media (max-width: 600px) {
  .rb-highlights { grid-template-columns: 1fr 1fr; }
  .rb-feature-grid { grid-template-columns: 1fr; }
  .rb-steps li::before { display: none; }
  .rb-panel-howto .rb-steps { padding-left: 20px; }
}