:root {
  --bg: #06141f;
  --surface: #0b2130;
  --surface-2: #0f2d3f;
  --line: rgba(52, 211, 153, 0.22);
  --text: #eafff8;
  --muted: #9fc5ba;
  --accent: #34d399;
  --accent-strong: #9fffd0;
  --danger: #ff6b6b;
  --shadow: 0 26px 70px rgba(0, 0, 0, 0.34);
}

html[data-bs-theme="light"] {
  --bg: #eafff8;
  --surface: #ffffff;
  --surface-2: #dff8ef;
  --line: rgba(6, 20, 31, 0.13);
  --text: #06141f;
  --muted: #4c655e;
  --accent: #087f5b;
  --accent-strong: #06141f;
  --shadow: 0 24px 65px rgba(6, 20, 31, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

.matrix-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(52, 211, 153, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(52, 211, 153, 0.06) 1px, transparent 1px),
    radial-gradient(circle at 15% 10%, rgba(52, 211, 153, 0.20), transparent 25rem),
    radial-gradient(circle at 85% 5%, rgba(52, 211, 153, 0.10), transparent 30rem);
  background-size: 44px 44px, 44px 44px, auto, auto;
  mask-image: linear-gradient(to bottom, black, transparent 92%);
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -0.04em;
  font-size: 1.18rem;
}

.brand:hover {
  color: var(--text);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: var(--bg);
  background: var(--accent);
  box-shadow: 0 14px 34px rgba(52, 211, 153, 0.24);
  font-size: 0.88rem;
  letter-spacing: -0.03em;
}

.theme-label,
.muted-text,
.form-text,
.text-secondary {
  color: var(--muted) !important;
}

.theme-toggle,
.clear-btn,
.copy-btn {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  transition: 0.2s ease;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  font-weight: 900;
}

.theme-toggle:hover,
.clear-btn:hover,
.copy-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.intro-shell,
.work-card,
.feature-strip {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.intro-shell {
  border-radius: 34px;
  padding: clamp(1rem, 2vw, 1.3rem);
}

.intro-main,
.matrix-preview {
  border-radius: 26px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--surface-2) 84%, transparent), color-mix(in srgb, var(--surface) 92%, transparent));
  border: 1px solid var(--line);
  padding: clamp(1.4rem, 4vw, 3.2rem);
  position: relative;
  overflow: hidden;
}

.intro-main::after {
  content: "010101";
  position: absolute;
  right: -0.5rem;
  bottom: -1.8rem;
  color: color-mix(in srgb, var(--accent) 18%, transparent);
  font-size: clamp(4rem, 12vw, 8.5rem);
  font-weight: 900;
  letter-spacing: -0.08em;
}

.mini-tag {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.48rem 0.82rem;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.intro-main h1 {
  margin: 1.1rem 0 0;
  font-size: clamp(3rem, 7vw, 6.2rem);
  font-weight: 950;
  line-height: 0.9;
  letter-spacing: -0.08em;
}

.intro-text {
  max-width: 42rem;
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.75;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-top: 1.7rem;
}

.btn-start,
.btn-submit {
  border: 0;
  color: var(--bg);
  background: var(--accent);
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 18px 45px rgba(52, 211, 153, 0.22);
  transition: 0.2s ease;
}

.btn-start {
  display: inline-flex;
  border-radius: 999px;
  padding: 0.9rem 1.25rem;
}

.btn-start:hover,
.btn-submit:hover {
  color: var(--bg);
  transform: translateY(-2px);
}

.status-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.85rem 1rem;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
}

.matrix-preview {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preview-head {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
}

.preview-head span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}

.preview-head strong {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(40px, 1fr));
  gap: 0.55rem;
}

.preview-grid span,
.matrix-grid span,
.playfair-grid span {
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent) 9%, var(--surface));
  color: var(--accent-strong);
  font-weight: 900;
}

.preview-grid span {
  aspect-ratio: 1;
  border-radius: 16px;
  font-size: 1.05rem;
}

.preview-line {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 0.85rem 1rem;
  color: var(--muted);
}

.preview-line b {
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.preview-result {
  border-radius: 20px;
  padding: 1rem;
  color: var(--bg);
  background: var(--accent);
  font-weight: 950;
  font-size: clamp(1.3rem, 3vw, 2rem);
  letter-spacing: 0.04em;
  text-align: center;
  word-break: break-word;
}

.feature-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border-radius: 28px;
  margin-top: 1rem;
}

.feature-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.feature-item span {
  color: var(--accent);
  font-weight: 950;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.feature-item h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 900;
}

.feature-item p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.work-card {
  border-radius: 30px;
  padding: clamp(1.15rem, 2vw, 1.6rem);
}

.section-title {
  margin-bottom: 1.2rem;
}

.section-title span,
.small-heading,
.matrix-section h3 {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 950;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.section-title h2 {
  margin: 0;
  font-weight: 950;
  letter-spacing: -0.045em;
}

.field-block,
.key-group {
  margin-bottom: 1rem;
}

.form-label {
  color: var(--text);
  font-weight: 800;
  margin-bottom: 0.48rem;
}

.input-modern,
.form-select,
.form-control {
  border-radius: 18px;
  border: 1px solid var(--line);
  background-color: color-mix(in srgb, var(--surface-2) 72%, transparent);
  color: var(--text);
  padding: 0.85rem 0.95rem;
}

.form-select option {
  background: var(--surface);
  color: var(--text);
}

.input-modern:focus,
.form-select:focus,
.form-control:focus {
  color: var(--text);
  background-color: color-mix(in srgb, var(--surface-2) 80%, transparent);
  border-color: var(--accent);
  box-shadow: 0 0 0 0.25rem color-mix(in srgb, var(--accent) 18%, transparent);
}

.algorithm-note {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.mode-switch input {
  display: none;
}

.mode-switch label {
  margin: 0;
  padding: 0.88rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  text-align: center;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface-2) 60%, transparent);
  cursor: pointer;
  transition: 0.2s ease;
  font-weight: 800;
}

.mode-switch input:checked+label {
  color: var(--bg);
  border-color: var(--accent);
  background: var(--accent);
}

.key-group {
  display: none;
}

.key-group.active {
  display: block;
  animation: fadeRise 0.25s ease both;
}

.btn-submit {
  border-radius: 20px;
  padding: 1rem 1.2rem;
}

.result-panel {
  min-height: 42rem;
}

.panel-code {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.55rem 0.75rem;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 900;
}

.output-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border: 1px solid var(--accent);
  border-radius: 24px;
  padding: 1rem;
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
}

.output-box span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.output-box strong {
  display: block;
  margin-top: 0.2rem;
  color: var(--accent-strong);
  font-size: clamp(1.35rem, 3vw, 2rem);
  word-break: break-word;
  letter-spacing: 0.03em;
}

.copy-btn,
.clear-btn {
  border-radius: 999px;
  padding: 0.7rem 0.95rem;
  font-weight: 800;
  white-space: nowrap;
}

.matrix-grid,
.playfair-grid {
  display: grid;
  gap: 0.45rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  width: max-content;
  max-width: 100%;
  background: color-mix(in srgb, var(--surface-2) 62%, transparent);
}

.matrix-grid.size-2 {
  grid-template-columns: repeat(2, 48px);
}

.matrix-grid.size-3 {
  grid-template-columns: repeat(3, 48px);
}

.playfair-grid {
  grid-template-columns: repeat(5, 48px);
}

.matrix-grid span,
.playfair-grid span {
  width: 48px;
  height: 48px;
  border-radius: 14px;
}

.clean-accordion .accordion-item,
.clean-accordion .accordion-button {
  background: color-mix(in srgb, var(--surface-2) 68%, transparent);
  color: var(--text);
  border-color: var(--line);
}

.clean-accordion .accordion-item {
  border-radius: 18px;
  overflow: hidden;
  margin-bottom: 0.65rem;
}

.clean-accordion .accordion-button:focus {
  box-shadow: none;
}

.trace-list {
  display: grid;
  gap: 0.75rem;
}

.trace-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 0.85rem;
  background: color-mix(in srgb, var(--surface-2) 62%, transparent);
}

.trace-item span {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: var(--bg);
  background: var(--accent);
  font-weight: 950;
  font-size: 0.8rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.trace-item p {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
}

.empty-box {
  min-height: 30rem;
  display: grid;
  place-items: center;
  align-content: center;
  text-align: center;
  color: var(--muted);
}

.empty-symbol {
  width: 82px;
  height: 82px;
  display: grid;
  place-items: center;
  border-radius: 28px;
  background: var(--accent);
  color: var(--bg);
  font-size: 2.5rem;
  font-weight: 950;
  margin-bottom: 1rem;
}

.empty-box h3 {
  color: var(--text);
  font-weight: 950;
}

.history-table-wrap {
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
}

.history-table {
  margin: 0;
  color: var(--text);
  --bs-table-bg: transparent;
  --bs-table-color: var(--text);
  --bs-table-border-color: var(--line);
  --bs-table-hover-bg: color-mix(in srgb, var(--accent) 8%, transparent);
  --bs-table-hover-color: var(--text);
}

.history-table thead th {
  color: var(--accent);
  background: color-mix(in srgb, var(--surface-2) 80%, transparent);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.reveal {
  animation: fadeRise 0.45s ease both;
}

@keyframes fadeRise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 992px) {
  .feature-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {

  .intro-shell,
  .work-card,
  .feature-strip {
    border-radius: 22px;
  }

  .intro-main,
  .matrix-preview {
    border-radius: 20px;
  }

  .output-box {
    align-items: flex-start;
    flex-direction: column;
  }

  .preview-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 0.38rem;
  }

  .matrix-grid.size-2 {
    grid-template-columns: repeat(2, 40px);
  }

  .matrix-grid.size-3 {
    grid-template-columns: repeat(3, 40px);
  }

  .playfair-grid {
    grid-template-columns: repeat(5, 40px);
  }

  .matrix-grid span,
  .playfair-grid span {
    width: 40px;
    height: 40px;
    border-radius: 12px;
  }
}