:root {
  color-scheme: light;
  --bg: #f4f7f5;
  --surface: #ffffff;
  --surface-soft: #eef4ef;
  --text: #17211b;
  --muted: #647067;
  --line: #d9e2dc;
  --primary: #176b5b;
  --primary-dark: #0e4d41;
  --accent: #d8a21b;
  --danger: #b42318;
  --code-bg: #101816;
  --code-text: #ecfff6;
  --shadow: 0 18px 50px rgba(24, 41, 32, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(135deg, rgba(216, 162, 27, 0.12), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 10px;
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 6px;
  font-size: 1.35rem;
}

.subtitle,
.trace-heading p {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 440px) 1fr;
  gap: 18px;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.controls,
.results,
.trace-panel {
  padding: 18px;
}

label {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
  color: var(--text);
  font-weight: 700;
}

label span {
  font-size: 0.92rem;
}

.field-group {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
}

.field-group > label {
  margin-bottom: 0;
  font-size: 0.92rem;
}

input,
textarea,
select,
button {
  font: inherit;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfb;
  color: var(--text);
  padding: 11px 12px;
}

textarea {
  min-height: 76px;
  resize: vertical;
}

.input-with-format {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 104px;
  gap: 8px;
  align-items: start;
}

.input-with-format select {
  font-weight: 700;
}

input[readonly] {
  background: var(--surface-soft);
}

small {
  color: var(--muted);
  font-weight: 500;
  word-break: break-word;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 800;
}

.primary-button {
  background: var(--primary);
  color: #fff;
}

.primary-button:hover {
  background: var(--primary-dark);
}

.secondary-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

.secondary-button:hover {
  background: var(--surface-soft);
}

.error {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--danger);
  font-weight: 700;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.result-card {
  min-height: 138px;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 16px;
  border-radius: 8px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.result-card span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

output {
  display: block;
  color: var(--text);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.trace-panel,
.key-schedule-panel,
.reference-panel {
  margin-top: 18px;
}

.key-schedule-panel {
  padding: 18px;
  overflow: hidden;
}

.key-schedule-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
}

.key-schedule-heading h2 {
  margin-bottom: 6px;
}

.key-schedule-heading p,
.key-schedule-note {
  color: var(--muted);
}

.key-schedule-heading p {
  max-width: 620px;
  margin-bottom: 0;
}

.key-schedule-actions {
  display: grid;
  min-width: 330px;
  gap: 8px;
}

.key-schedule-order {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfb;
}

.key-schedule-order span {
  color: var(--muted);
  font-size: 0.76rem;
  white-space: nowrap;
}

.key-schedule-order select {
  padding: 7px 9px;
  font-size: 0.78rem;
  font-weight: 800;
}

.key-schedule-legend {
  display: grid;
  gap: 6px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.8rem;
}

.key-schedule-legend span {
  display: flex;
  gap: 8px;
}

.key-schedule-note {
  margin: 12px 0 16px;
  font-size: 0.88rem;
}

.key-schedule-scroll {
  overflow-x: auto;
  padding: 4px 2px 12px;
  scrollbar-color: var(--primary) var(--surface-soft);
}

.key-schedule-track {
  display: flex;
  width: max-content;
  align-items: end;
}

.key-round {
  width: 244px;
  flex: 0 0 244px;
  overflow: hidden;
  border: 1px solid rgba(23, 33, 27, 0.24);
  border-radius: 8px;
  background: #fff;
}

.key-round-rule {
  display: grid;
  min-height: 102px;
  align-content: start;
  gap: 6px;
  padding: 10px;
  border-bottom: 1px solid rgba(23, 33, 27, 0.2);
  background: #f4e3f6;
  color: #44224d;
  font-size: 0.76rem;
}

.key-round-rule-initial {
  align-content: center;
}

.key-g-value {
  color: #714679;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.72rem;
}

.key-round-words {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.key-word {
  display: grid;
  grid-template-rows: 28px repeat(4, 38px);
  border-left: 1px solid rgba(255, 255, 255, 0.55);
}

.key-word:first-child {
  border-left: 0;
}

.key-word-first {
  box-shadow: inset 4px 0 #d8a8dc;
}

.key-word-label,
.key-byte {
  display: grid;
  place-items: center;
}

.key-word-label {
  background: rgba(255, 255, 255, 0.78);
  color: #354139;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 800;
}

.key-byte {
  border-top: 1px solid rgba(255, 255, 255, 0.62);
  color: #112018;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.9rem;
  font-weight: 800;
}

.key-round-initial .key-byte,
.key-round-initial .key-round-footer {
  background: #f3b719;
}

.key-round-odd .key-byte,
.key-round-odd .key-round-footer {
  background: #8bc34a;
}

.key-round-even .key-byte,
.key-round-even .key-round-footer {
  background: #08a05c;
  color: #071b11;
}

.key-round-footer {
  display: grid;
  gap: 2px;
  padding: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.68);
  text-align: center;
  text-transform: uppercase;
  font-weight: 900;
}

.key-round-footer small {
  font-size: 0.66rem;
  font-weight: 750;
  opacity: 0.72;
  text-transform: none;
}

.key-round-arrow {
  display: grid;
  width: 34px;
  flex: 0 0 34px;
  place-items: center;
  padding-bottom: 82px;
  color: var(--primary);
  font-size: 1.45rem;
  font-weight: 900;
}

.key-schedule-empty {
  min-width: min(760px, calc(100vw - 72px));
  margin: 0;
  padding: 24px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

.reference-panel {
  padding: 18px;
  background:
    linear-gradient(145deg, rgba(23, 107, 91, 0.055), transparent 280px),
    var(--surface);
}

.trace-heading,
.reference-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.reference-heading h2,
.reference-block h3 {
  margin-bottom: 0;
}

.reference-heading {
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.section-kicker {
  margin-bottom: 5px;
  color: var(--primary);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reference-intro {
  max-width: 680px;
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.reference-summary,
.reference-tag {
  display: inline-flex;
  align-items: center;
  width: max-content;
  border-radius: 999px;
  white-space: nowrap;
  font-weight: 800;
}

.reference-summary {
  padding: 8px 11px;
  border: 1px solid rgba(23, 107, 91, 0.22);
  background: rgba(23, 107, 91, 0.08);
  color: var(--primary-dark);
  font-size: 0.78rem;
}

.trace-heading select {
  max-width: 180px;
}

.reference-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  gap: 16px;
}

.reference-block {
  min-width: 0;
  margin-top: 16px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 24px rgba(24, 41, 32, 0.055);
}

.reference-grid .reference-block {
  margin-top: 0;
}

.reference-block-heading {
  display: flex;
  min-height: 58px;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 13px;
}

.reference-block-heading h3 {
  color: var(--text);
  font-size: 1rem;
}

.reference-block-heading p {
  max-width: 540px;
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.reference-tag {
  flex: 0 0 auto;
  padding: 5px 8px;
  background: var(--surface-soft);
  color: var(--primary-dark);
  font-size: 0.7rem;
}

.reference-table-wrap {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.reference-grid .reference-table-wrap {
  max-height: 420px;
  overflow: auto;
}

.reference-panel table {
  border-collapse: separate;
  border-spacing: 0;
}

.reference-panel thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  border-bottom: 1px solid #cbd8d0;
  background: #e7f0ea;
  color: #405047;
  font-size: 0.76rem;
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.reference-panel tbody tr:nth-child(even) td {
  background: #f8fbf9;
}

.reference-panel tbody tr:hover td {
  background: #edf7f1;
}

.reference-panel tbody tr:last-child td,
.reference-panel tbody tr:last-child th {
  border-bottom: 0;
}

#asciiBody td:first-child {
  color: var(--primary-dark);
  font-weight: 750;
}

#rconBody td:first-child {
  color: var(--primary);
  font-weight: 900;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.88rem;
}

td {
  font-size: 0.92rem;
}

.table-sm th,
.table-sm td {
  padding: 8px;
  font-size: 0.86rem;
}

.sbox-table {
  min-width: 760px;
}

.sbox-table th,
.sbox-table td {
  text-align: center;
  white-space: nowrap;
}

.reference-panel .sbox-table thead th,
.reference-panel .sbox-table tbody th {
  background: var(--primary-dark);
  color: #fff;
}

.reference-panel .sbox-table tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  border-bottom-color: rgba(255, 255, 255, 0.16);
}

.reference-panel .sbox-table tbody td {
  color: #173c31;
  font-weight: 700;
}

.reference-panel .sbox-table tbody tr:hover td {
  background: #dcefe5;
  color: var(--primary-dark);
}

.mono {
  font-family: "Cascadia Mono", Consolas, monospace;
}

.state-matrix {
  display: inline-table;
  width: 184px;
  min-width: 184px;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 4px;
  padding: 6px;
  border-radius: 8px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.86rem;
}

.state-matrix td {
  width: 38px;
  min-width: 0;
  height: 26px;
  border: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
  text-align: center;
  vertical-align: middle;
}

@media (max-width: 520px) {
  .state-matrix {
    width: 160px;
    min-width: 160px;
    border-spacing: 2px;
    padding: 4px;
  }

  .state-matrix td {
    width: 36px;
    height: 24px;
    font-size: 0.8rem;
  }
}

.empty-row {
  color: var(--muted);
}

@media (max-width: 820px) {
  .hero,
  .trace-heading,
  .key-schedule-heading,
  .reference-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .key-schedule-legend {
    min-width: 0;
  }

  .key-schedule-actions {
    min-width: 0;
  }

  .workspace,
  .results,
  .reference-grid,
  .meta-grid {
    grid-template-columns: 1fr;
  }

  .trace-heading select {
    max-width: none;
  }
}

@media (max-width: 520px) {
  .reference-panel {
    padding: 14px;
  }

  .reference-block {
    padding: 12px;
  }

  .reference-block-heading {
    min-height: 0;
    flex-direction: column;
    gap: 8px;
  }
}