:root {
  --bg: #0b1020;
  --panel: #131a30;
  --panel2: #1a2340;
  --text: #dbe4ff;
  --dim: #8b96b8;
  --accent: #9dff57;
  --warn: #ffcf5c;
  --bad: #ff6b6b;
  --info: #6cb8ff;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  padding: 0 16px 48px;
}
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 4px; border-bottom: 1px solid var(--panel2);
}
.brand { font-size: 22px; font-weight: 700; }
.meta { color: var(--dim); font-size: 13px; }

.summary {
  display: flex; gap: 12px; margin: 20px 0; flex-wrap: wrap;
}
.stat {
  background: var(--panel); border: 1px solid var(--panel2);
  border-radius: 10px; padding: 14px 20px; min-width: 130px;
}
.stat .num { font-size: 26px; font-weight: 700; }
.stat .lbl { color: var(--dim); font-size: 12px; margin-top: 4px; }
.stat.gold .num { color: var(--warn); }

.pipeline-legend {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px;
  align-items: center;
}
.stage {
  font-size: 12px; padding: 6px 12px; border-radius: 20px;
  background: var(--panel); border: 1px solid var(--panel2); color: var(--dim);
  font-family: inherit; cursor: pointer;
}
button.stage:hover { border-color: var(--dim); color: var(--text); }
.stage.active { color: var(--accent); border-color: var(--accent); }
.hint { font-size: 12px; color: var(--dim); margin-left: 4px; }

.board {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.card {
  background: var(--panel); border: 1px solid var(--panel2);
  border-radius: 12px; padding: 18px; cursor: pointer;
}
.card:hover { border-color: var(--dim); }
.card:focus-visible { outline: 2px solid var(--info); outline-offset: 2px; }
.card.solved { border-color: var(--accent); }
.card.review { border-color: var(--warn); }
.card.failed, .card.expired { border-color: var(--bad); }
.card h2 { margin: 0 0 4px; font-size: 18px; }
.card .sub { color: var(--dim); font-size: 13px; margin-bottom: 12px; }
.badge {
  display: inline-block; font-size: 12px; padding: 4px 10px;
  border-radius: 6px; margin-bottom: 10px; font-weight: 600;
}
.badge.new { background: #2a3358; color: var(--info); }
.badge.intel { background: #2a3358; color: var(--info); }
.badge.solving { background: #3a2f14; color: var(--warn); }
.badge.review { background: #3a2f14; color: var(--warn); }
.badge.solved { background: #1d3a1d; color: var(--accent); }
.badge.failed, .badge.expired { background: #3a1d1d; color: var(--bad); }
.steps { display: flex; gap: 4px; margin: 10px 0; }
.steps i {
  flex: 1; height: 6px; border-radius: 3px; background: var(--panel2);
}
.steps i.on { background: var(--accent); }
.steps i.cur { background: var(--warn); }
.kv { font-size: 13px; color: var(--dim); line-height: 1.9; }
.kv b { color: var(--text); font-weight: 600; }
.flag-ok { color: var(--accent); font-weight: 700; }
.agent-on { color: var(--info); font-weight: 600; }
.detail {
  margin-top: 12px; padding-top: 10px;
  border-top: 1px dashed var(--panel2);
}
.drow {
  display: flex; justify-content: space-between; gap: 12px;
  font-size: 13px; line-height: 2;
}
.drow span { color: var(--dim); flex-shrink: 0; }
.drow b { color: var(--text); font-weight: 600; text-align: right; word-break: break-all; }
footer { text-align: center; color: var(--dim); font-size: 12px; margin-top: 32px; }
.empty { color: var(--dim); text-align: center; padding: 60px 0; grid-column: 1 / -1; }

/* 新增題目 */
.add-btn {
  margin-left: 12px; padding: 8px 16px; border-radius: 8px;
  border: 1px solid var(--accent); background: transparent; color: var(--accent);
  font-family: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
}
.add-btn:hover { background: var(--accent); color: #0b1020; }
.modal {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(4, 7, 18, 0.75);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 16px; overflow-y: auto;
}
.modal.hidden { display: none; }
.modal-card {
  background: var(--panel); border: 1px solid var(--panel2);
  border-radius: 14px; padding: 24px; width: 100%; max-width: 520px;
}
.modal-card h2 { margin: 0 0 4px; font-size: 20px; }
.modal-sub { color: var(--dim); font-size: 13px; margin: 0 0 18px; }
.modal-card label { display: block; font-size: 13px; color: var(--dim); margin-bottom: 12px; }
.modal-card input, .modal-card select, .modal-card textarea {
  display: block; width: 100%; margin-top: 6px;
  background: var(--bg); border: 1px solid var(--panel2); color: var(--text);
  border-radius: 8px; padding: 10px 12px; font-family: inherit; font-size: 14px;
}
.modal-card input:focus, .modal-card select:focus, .modal-card textarea:focus {
  outline: none; border-color: var(--info);
}
.modal-card .row { display: flex; gap: 12px; }
.modal-card .row label { flex: 1; }
.form-msg { font-size: 13px; min-height: 20px; margin: 4px 0 12px; color: var(--dim); }
.form-msg.ok { color: var(--accent); }
.form-msg.err { color: var(--bad); }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; }
.btn {
  padding: 10px 18px; border-radius: 8px; font-family: inherit;
  font-size: 14px; font-weight: 600; cursor: pointer; border: 1px solid var(--panel2);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #0b1020; }
.btn.primary:disabled { opacity: 0.5; cursor: wait; }
.btn.ghost { background: transparent; color: var(--dim); }
.btn.ghost:hover { color: var(--text); border-color: var(--dim); }