:root {
  color-scheme: dark;
  --bg: #0a0d14;
  --bg-soft: #111521;
  --panel: rgba(12, 18, 30, 0.88);
  --panel-soft: rgba(255, 255, 255, 0.035);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #eef2ff;
  --muted: #94a3b8;
  --gold: #d4af37;
  --gold-soft: rgba(212, 175, 55, 0.14);
  --indigo: #7c86ff;
  --indigo-soft: rgba(124, 134, 255, 0.16);
  --emerald: #48cfa3;
  --blue: #7ba7ff;
  --yellow: #edc86a;
  --violet: #ab94ff;
}

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(circle at top left, rgba(124, 134, 255, 0.12), transparent 28rem),
    radial-gradient(circle at top right, rgba(212, 175, 55, 0.08), transparent 24rem),
    radial-gradient(circle at bottom, rgba(72, 207, 163, 0.06), transparent 30rem),
    linear-gradient(180deg, #090c13 0%, #0d111a 38%, #0a0d14 100%);
}

.glass {
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px);
}

.hero-panel {
  position: relative;
  overflow: hidden;
}

.hero-panel::after {
  content: "";
  position: absolute;
  inset: auto -8rem -10rem auto;
  width: 18rem;
  height: 18rem;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18), transparent 68%);
  pointer-events: none;
}

.hero-stat,
.info-card,
.word-card {
  border: 1px solid var(--border);
  background: var(--panel-soft);
  border-radius: 1.1rem;
}

.hero-stat {
  padding: 0.95rem 1rem;
}

.hero-stat-label,
.info-card-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #97a1b8;
}

.hero-stat-value,
.info-card-value {
  margin-top: 0.35rem;
  color: white;
  font-weight: 700;
  font-size: 0.95rem;
}

.info-card {
  padding: 0.95rem 1rem;
}

.feature-item {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}

.feature-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  margin-top: 0.48rem;
  flex: 0 0 auto;
  background: linear-gradient(135deg, var(--gold), #f2db94);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.12);
}

.input-base {
  width: 100%;
  border-radius: 1rem;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(6, 10, 18, 0.92);
  color: var(--text);
  padding: 0.9rem 1rem;
  outline: none;
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease, transform .18s ease;
}

.input-base::placeholder {
  color: #6f7c95;
}

.input-base:focus {
  border-color: rgba(212, 175, 55, 0.5);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.10);
  background: rgba(10, 15, 25, 0.98);
}

.btn-primary,
.btn-secondary {
  border-radius: 1rem;
  padding: 0.82rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 900;
  transition: transform .12s ease, background .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
}

.btn-primary:hover,
.btn-secondary:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, #d4af37 0%, #f0d87e 100%);
  color: #17120a;
  box-shadow: 0 12px 28px rgba(212, 175, 55, 0.20);
}

.btn-primary:hover {
  box-shadow: 0 18px 34px rgba(212, 175, 55, 0.26);
}

.btn-secondary {
  border: 1px solid var(--border-strong);
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.03);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.065);
  border-color: rgba(212, 175, 55, 0.28);
}

.nav-counter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  border: 1px solid rgba(212, 175, 55, 0.2);
  background: rgba(212, 175, 55, 0.09);
  color: #f6e2a1;
  font-size: 0.78rem;
  font-weight: 800;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.legend-swatch {
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 0.35rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.legend-subbytes { background: rgba(123, 167, 255, 0.40); }
.legend-shiftrows { background: rgba(72, 207, 163, 0.38); }
.legend-mixcolumns { background: rgba(237, 200, 106, 0.38); }
.legend-key { background: rgba(171, 148, 255, 0.38); }
.legend-output { background: rgba(212, 175, 55, 0.36); }

.empty-state {
  border: 1px dashed rgba(212, 175, 55, 0.24);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border-radius: 1.75rem;
  padding: 2rem;
}

.details-note {
  font-size: 0.82rem;
  line-height: 1.65;
  color: #9ca9c0;
}

.details-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 999px;
  border: 1px solid rgba(212, 175, 55, 0.18);
  background: rgba(212, 175, 55, 0.08);
  color: #f3dfa0;
  padding: 0.42rem 0.75rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details[open] .chevron { transform: rotate(90deg); }
.chevron { transition: transform .18s ease; }

.matrix-table,
.const-table {
  border-collapse: separate;
  border-spacing: 0.24rem;
  table-layout: fixed;
  width: 100%;
}

.matrix-wrap,
.const-wrap {
  overflow-x: auto;
  border-radius: 1rem;
}

.matrix-table { min-width: 17rem; }

.matrix-table th,
.matrix-table td,
.const-table th,
.const-table td {
  text-align: center;
  border-radius: 0.62rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.matrix-table th,
.matrix-table td {
  padding: 0.55rem 0.45rem;
  font-size: 0.86rem;
  line-height: 1.1rem;
}

.matrix-table th,
.const-table th {
  color: #dbe3f1;
  background: rgba(255, 255, 255, 0.05);
  font-weight: 900;
}

.const-table { min-width: 46rem; }

.const-table th,
.const-table td {
  padding: 0.45rem 0.35rem;
  font-size: 0.78rem;
}

.cell-base { background: rgba(255, 255, 255, 0.035); color: #eef2ff; }
.cell-subbytes { background: rgba(123, 167, 255, 0.16); color: #eff6ff; border-color: rgba(123, 167, 255, 0.36) !important; }
.cell-shiftrows { background: rgba(72, 207, 163, 0.15); color: #ecfdf5; border-color: rgba(72, 207, 163, 0.34) !important; }
.cell-mixcolumns { background: rgba(237, 200, 106, 0.16); color: #fff9ea; border-color: rgba(237, 200, 106, 0.34) !important; }
.cell-key { background: rgba(171, 148, 255, 0.15); color: #f7f4ff; border-color: rgba(171, 148, 255, 0.34) !important; }
.cell-output { background: rgba(212, 175, 55, 0.15); color: #fffbea; border-color: rgba(212, 175, 55, 0.35) !important; }
.cell-diff { box-shadow: inset 0 0 0 1px rgba(248, 250, 252, 0.26); }

.operation-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.28rem 0.62rem;
  border: 1px solid rgba(212, 175, 55, 0.18);
  background: rgba(212, 175, 55, 0.08);
  color: #f0d98a;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.formula-box {
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  padding: 0.82rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  color: #d8deea;
}

.nav-link {
  display: block;
  border-radius: 0.95rem;
  border: 1px solid transparent;
  padding: 0.7rem 0.8rem;
  color: #a3b0c5;
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(212, 175, 55, 0.14);
  color: #ffffff;
}

.nav-link.active {
  background: rgba(212, 175, 55, 0.10);
  border-color: rgba(212, 175, 55, 0.22);
  color: #fff3c1;
  transform: translateX(2px);
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.4rem, 1fr));
  gap: 0.75rem;
}

.word-card {
  padding: 0.8rem 0.9rem;
  font-size: 0.76rem;
  line-height: 1.55;
  color: #dbe4f0;
}

.word-card b {
  color: white;
  display: inline-block;
  margin-bottom: 0.2rem;
}

.word-card span {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.hide-detail .detail-only {
  display: none !important;
}

@media (max-width: 640px) {
  .empty-state { padding: 1.4rem; }
}