.mcell.scanning { outline: 2px solid #534AB7; outline-offset:2px; }
.mcell.skip { opacity:.35; }
.demo-note {
  font-size:11px; color:var(--text2); background:var(--bg2);
  border-radius:var(--radius); padding:7px 10px;
  border-left:3px solid transparent; line-height:1.5;
}
.say-box { background:var(--bg3); border:0.5px solid var(--border); border-radius:var(--radius); padding:9px 12px; }
.say-lbl { font-size:10px; font-weight:500; letter-spacing:.06em; text-transform:uppercase; color:var(--text2); margin-bottom:4px; }
.say-txt { font-size:12px; color:var(--text); line-height:1.5; }
.cx-row { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.cx-card { background:var(--bg2); border-radius:var(--radius); padding:10px 14px; text-align:center; }
.cx-big { font-size:18px; font-weight:500; }
.cx-sub { font-size:11px; color:var(--text2); margin-top:2px; }
.divider { height:1px; background:var(--border); }

.java-block { background:var(--bg2);border-radius:var(--radius);border:0.5px solid var(--border);overflow:hidden; }
.java-group-hdr { font-size:9px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;padding:6px 12px 4px;color:var(--text2);border-bottom:1px solid var(--border); }
.java-line-row { display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--border); }
.java-line-row:last-child { border-bottom:none; }
.java-code-cell { padding:5px 12px;font-family:monospace;font-size:11.5px;color:var(--text);line-height:1.7;white-space:pre; }
.java-note-cell { padding:5px 12px;font-size:11px;color:var(--text2);line-height:1.6;border-left:1px solid var(--border);display:flex;align-items:center; }
.java-note-cell b { color:var(--text);font-weight:500; }
.java-full { font-family:monospace;font-size:11.5px;color:var(--text);line-height:1.75;white-space:pre;background:var(--bg2);border-radius:var(--radius);padding:14px 16px;width:100%;border:0.5px solid var(--border);overflow-x:auto;display:block; }
.tag { display:inline-block;font-size:9px;font-weight:600;letter-spacing:.05em;padding:1px 6px;border-radius:3px;margin-right:4px; }
.tag-k { background:#EEEDFE;color:#3C3489; }
.tag-w { background:#E1F5EE;color:#085041; }

.card-wrap { position: relative; width: 100%; max-width: 620px; }
.hamburger {
  position: absolute; top: 14px; left: 14px; z-index: 20;
  width: 32px; height: 32px; border-radius: 6px;
  border: 0.5px solid var(--border2); background: var(--bg3);
  cursor: pointer; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px;
  transition: background .15s;
}
.hamburger:hover { background: var(--bg2); }
.hamburger span { display: block; width: 14px; height: 1.5px; background: var(--text); border-radius: 2px; }

.sidebar-overlay {
  display: none; position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.35);
}
.sidebar-overlay.open { display: block; }

.sidebar {
  position: fixed; top: 0; left: -360px; bottom: 0; width: 340px; z-index: 101;
  background: var(--bg3); border-right: 0.5px solid var(--border2);
  display: flex; flex-direction: column;
  transition: left .25s cubic-bezier(.4,0,.2,1);
  overflow-y: auto;
}
.sidebar.open { left: 0; }

.sidebar-hdr {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 18px 12px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg3); z-index: 2;
}
.sidebar-title { font-size: 13px; font-weight: 500; color: var(--text); }
.sidebar-close {
  width: 28px; height: 28px; border-radius: 6px;
  border: 0.5px solid var(--border2); background: none;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: var(--text2); transition: background .15s;
}
.sidebar-close:hover { background: var(--bg2); }

.sidebar-body { display: flex; flex-direction: column; gap: 0; padding: 8px 0 24px; }

.pattern-group { padding: 10px 18px 4px; }
.pattern-label { font-size: 9px; font-weight: 600; letter-spacing: .07em; text-transform: uppercase; color: var(--text2); margin-bottom: 6px; }

.prob-card {
  display: flex; flex-direction: column; gap: 0;
  border-radius: var(--radius); border: 0.5px solid var(--border);
  margin: 0 18px 8px; overflow: hidden;
  cursor: pointer; transition: border-color .15s;
}
.prob-card:hover { border-color: var(--border2); }
.prob-card.current { border-color: #7F77DD; background: #EEEDFE; pointer-events: none; }

.prob-card-top { display: flex; align-items: center; gap: 8px; padding: 9px 12px; }
.prob-num { font-size: 10px; color: var(--text2); min-width: 28px; }
.prob-name { font-size: 12px; font-weight: 500; color: var(--text); flex: 1; }
.diff-badge { font-size: 9px; font-weight: 600; padding: 1px 6px; border-radius: 3px; }
.diff-easy   { background: #E1F5EE; color: #085041; }
.diff-med    { background: #FAEEDA; color: #633806; }
.diff-hard   { background: #FAECE7; color: #993C1D; }

.prob-bridge {
  font-size: 11px; color: var(--text2); line-height: 1.55;
  padding: 0 12px 9px; border-top: 1px solid var(--border);
  margin-top: 0; display: none;
}
.prob-card.expanded .prob-bridge { display: block; }
.prob-bridge b { color: var(--text); }

.prob-pattern-tag {
  display: inline-block; font-size: 9px; font-weight: 600;
  letter-spacing: .04em; padding: 1px 6px; border-radius: 3px;
  margin-right: 4px; margin-bottom: 4px;
}

.sidebar-divider { height: 1px; background: var(--border); margin: 8px 18px 12px; }

.prob-viewer {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: var(--bg); overflow-y: auto;
  flex-direction: column; align-items: center;
  padding: 0 0 48px;
}
.prob-viewer.open { display: flex; }
.prob-viewer-hdr {
  width: 100%; max-width: 680px;
  display: flex; align-items: center; gap: 12px;
  padding: 18px 16px 8px;
}
.prob-back {
  padding: 5px 12px; border-radius: 6px;
  border: 0.5px solid var(--border2);
  background: var(--bg3); color: var(--text2);
  font-size: 12px; cursor: pointer;
  transition: background .15s; white-space: nowrap;
}
.prob-back:hover { background: var(--bg2); }
.prob-viewer-title { font-size: 16px; font-weight: 500; color: var(--text); }
.prob-viewer-sub { font-size: 12px; color: var(--text2); margin-top: 1px; }
.prob-viewer-card {
  background: var(--bg3); border: 0.5px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px;
  width: calc(100% - 32px); max-width: 648px;
}

.prob-card-open-btn {
  display: block; width: calc(100% - 36px); margin: 0 18px 10px;
  padding: 7px; font-size: 11px; font-weight: 500;
  border-radius: var(--radius); border: 0.5px solid var(--border2);
  background: var(--bg2); color: var(--text); cursor: pointer;
  text-align: center; transition: background .15s;
}
.prob-card-open-btn:hover { background: var(--bg3); border-color: #7F77DD; color: #3C3489; }