/* RSA Encryption Visualization — style */
:root {
  --bg: #0c1120;
  --bg-soft: #111832;
  --card: #151d3b;
  --card-edge: #263256;
  --ink: #e8ecf8;
  --ink-dim: #9aa5c4;
  --accent: #f5b942;
  --accent-2: #4fd1c5;
  --danger: #f2708a;
  --ok: #5dd39e;
  --mono: "SF Mono", "Cascadia Code", Consolas, Menlo, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(79, 209, 197, 0.08), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(245, 185, 66, 0.07), transparent 60%),
    var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.rsa-container {
  max-width: 1380px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

header h1 {
  margin: 0 0 6px;
  font-size: 1.65rem;
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 0 0 18px;
  color: var(--ink-dim);
  max-width: 980px;
}

.main-layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

@media (max-width: 980px) {
  .main-layout { grid-template-columns: 1fr; }
}

/* ---------- controls ---------- */
.controls-panel {
  background: var(--bg-soft);
  border: 1px solid var(--card-edge);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: sticky;
  top: 14px;
}

@media (max-width: 980px) {
  .controls-panel { position: static; }
}

.control-section h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.prime-row {
  display: grid;
  grid-template-columns: 18px 1fr 40px;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.prime-row label { font-style: italic; font-family: var(--mono); color: var(--accent-2); }

input[type="text"] {
  width: 100%;
  background: #0b1024;
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.92rem;
  padding: 8px 10px;
}

input[type="text"]:focus { outline: 1px solid var(--accent-2); }

.mini-btn {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 7px 0;
}

.mini-btn:hover { border-color: var(--accent-2); }

.control-group { margin: 10px 0 4px; }

.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--ink-dim);
  margin-bottom: 4px;
}

.control-group .val { color: var(--accent-2); font-family: var(--mono); }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-2);
}

.key-error {
  background: rgba(242, 112, 138, 0.12);
  border: 1px solid rgba(242, 112, 138, 0.4);
  border-radius: 8px;
  color: var(--danger);
  font-size: 0.85rem;
  padding: 7px 10px;
  margin-bottom: 8px;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  margin: 8px 0;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.83rem;
}

.stat-label { color: var(--ink-dim); white-space: nowrap; }
.stat-val { color: var(--ink); text-align: right; }
.mono { font-family: var(--mono); }

.formula-box {
  background: #0b1024;
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent-2);
  overflow-wrap: anywhere;
}

.hint { font-size: 0.8rem; color: var(--ink-dim); margin: 8px 0 0; }

.btn-row { display: flex; gap: 8px; margin-bottom: 6px; }

.action-btn {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 9px 10px;
}

.action-btn:hover:not(:disabled) { border-color: var(--accent-2); color: var(--accent-2); }
.action-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.action-btn.danger { border-color: rgba(242, 112, 138, 0.5); color: var(--danger); }
.action-btn.danger:hover:not(:disabled) { border-color: var(--danger); color: var(--danger); }

/* ---------- viz grid ---------- */
.viz-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

@media (max-width: 1240px) {
  .viz-grid { grid-template-columns: 1fr; }
}

.canvas-card {
  background: var(--bg-soft);
  border: 1px solid var(--card-edge);
  border-radius: 14px;
  padding: 16px;
}

.canvas-card.wide { grid-column: 1 / -1; }

.canvas-card h3 { margin: 0 0 6px; font-size: 1.02rem; }

.viz-note {
  margin: 0 0 12px;
  color: var(--ink-dim);
  font-size: 0.84rem;
  max-width: 1020px;
}

canvas { width: 100%; height: 260px; display: block; border-radius: 10px; background: #0b1024; }

#fold-canvas { height: 300px; }
#rho-canvas { height: 220px; }

.player-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.player-row .action-btn { flex: 0 0 auto; padding: 7px 12px; }

.mode-badge {
  background: rgba(245, 185, 66, 0.12);
  border: 1px solid rgba(245, 185, 66, 0.4);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.75rem;
  padding: 3px 10px;
}

.step-counter { margin-left: auto; color: var(--ink-dim); font-size: 0.85rem; }

/* ---------- tables ---------- */
.table-wrap {
  max-height: 300px;
  overflow: auto;
  border: 1px solid var(--card-edge);
  border-radius: 10px;
}

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }

th, td {
  padding: 7px 10px;
  text-align: right;
  border-bottom: 1px solid rgba(38, 50, 86, 0.6);
  font-family: var(--mono);
}

th {
  position: sticky;
  top: 0;
  background: var(--card);
  color: var(--ink-dim);
  font-weight: 600;
  z-index: 1;
}

td:first-child, th:first-child { text-align: left; }

tbody tr:hover { background: rgba(79, 209, 197, 0.06); }
tbody tr.selected { background: rgba(245, 185, 66, 0.12); }
tbody tr:last-child td { border-bottom: none; }

td .ok { color: var(--ok); }
td .bad { color: var(--danger); }
td .nafit { color: var(--ink-dim); }

/* ---------- rho banner ---------- */
.banner {
  border-radius: 10px;
  font-size: 0.9rem;
  padding: 10px 12px;
  margin: 12px 0;
}

.banner.running { background: rgba(79, 209, 197, 0.1); border: 1px solid rgba(79, 209, 197, 0.4); color: var(--accent-2); }
.banner.cracked { background: rgba(242, 112, 138, 0.12); border: 1px solid rgba(242, 112, 138, 0.5); color: var(--danger); }
.banner.stalled { background: rgba(245, 185, 66, 0.1); border: 1px solid rgba(245, 185, 66, 0.4); color: var(--accent); }
.banner .mono { font-family: var(--mono); }

/* ---------- compare bars ---------- */
.compare-bars { display: flex; flex-direction: column; gap: 12px; margin: 6px 0 12px; }

.cmp-row {
  display: grid;
  grid-template-columns: 110px 1fr 110px;
  gap: 10px;
  align-items: center;
  font-size: 0.82rem;
}

.cmp-label { color: var(--ink-dim); }

.cmp-track {
  height: 14px;
  background: #0b1024;
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  overflow: hidden;
}

.cmp-fill { height: 100%; width: 0%; border-radius: 999px; transition: width 0.4s ease; }
.cmp-fill.trial { background: linear-gradient(90deg, #f2708a, #f5a04f); }
.cmp-fill.rho { background: linear-gradient(90deg, #4fd1c5, #5dd39e); }

.cmp-val { text-align: right; color: var(--ink); font-size: 0.78rem; }

/* ---------- education ---------- */
.education { margin-top: 26px; }

.tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }

.tab-btn {
  background: var(--bg-soft);
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  color: var(--ink-dim);
  cursor: pointer;
  font-size: 0.88rem;
  padding: 7px 18px;
}

.tab-btn.active { color: var(--accent); border-color: var(--accent); }

.tab-pane { display: none; }
.tab-pane.active {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.edu-card {
  background: var(--bg-soft);
  border: 1px solid var(--card-edge);
  border-radius: 14px;
  padding: 18px;
}

.edu-card h3 { margin: 0 0 8px; font-size: 1rem; color: var(--accent-2); }
.edu-card p { margin: 0; color: var(--ink-dim); font-size: 0.88rem; }

footer {
  margin-top: 26px;
  text-align: center;
  color: var(--ink-dim);
  font-size: 0.8rem;
}