:root {
  --bg: #0c0f14;
  --bg-elevated: #141a24;
  --bg-input: #0e131c;
  --border: rgba(94, 234, 212, 0.12);
  --accent: #5eead4;
  --accent-dim: rgba(94, 234, 212, 0.55);
  --warn: #fbbf24;
  --text: #e8edf5;
  --text-muted: #8b98ab;
  --danger: #f87171;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --radius: 12px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(94, 234, 212, 0.08), transparent),
    radial-gradient(ellipse 80% 50% at 100% 50%, rgba(56, 189, 248, 0.06), transparent),
    var(--bg);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

header.hero {
  text-align: center;
  margin-bottom: 1.75rem;
}

header.hero h1 {
  margin: 0 0 0.35rem;
  font-weight: 700;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #f0fdfa 0%, var(--accent) 55%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

header.hero .hero-guide {
  max-width: 44rem;
  margin: 0.75rem auto 0;
  text-align: left;
}

header.hero .hero-guide p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.58;
}

header.hero .hero-guide p + p {
  margin-top: 0.75rem;
}

.wb-guide-title {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
}

.wb-guide-steps {
  margin: 0;
  padding-left: 1.35rem;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.wb-guide-steps li + li {
  margin-top: 0.45rem;
}

.wb-guide-note {
  margin: 0.85rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.wb-levels {
  margin: 0.65rem 0 0.5rem;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
}

.wb-levels-heading {
  margin: 0 0 0.55rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.wb-levels-note {
  font-weight: 400;
  color: var(--text-muted);
}

.wb-levels-sliders {
  display: grid;
  gap: 0.45rem;
}

.wb-levels-row {
  display: grid;
  grid-template-columns: 3.25rem 1fr 2.5rem;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.wb-levels-row span {
  font-weight: 600;
  color: var(--accent-dim);
}

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

.wb-levels-row output {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: right;
  color: var(--text);
}

.wb-levels .btn--zoom-text {
  margin-top: 0.55rem;
}

.wb-sat-toggle {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0.5rem 0 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.wb-sat-toggle input {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.wb-sat-toggle .sat-red {
  color: #f87171;
  font-weight: 600;
}

.wb-sat-toggle .sat-black {
  color: #e8edf5;
  font-weight: 600;
  background: #000;
  padding: 0 0.2rem;
  border-radius: 2px;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}

.panel + .panel {
  margin-top: 1.15rem;
}

.panel h2 {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.65rem;
  align-items: center;
}

.toolbar--primary {
  margin-bottom: 1rem;
}

.toolbar--boxes {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
}

.toolbar label.file-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border-radius: 8px;
  cursor: pointer;
}

.toolbar label.file-btn input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

.btn {
  padding: 0.45rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

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

.btn.is-active {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 1px rgba(94, 234, 212, 0.25);
}

.btn--accent {
  color: #0c0f14;
  background: linear-gradient(135deg, #5eead4 0%, #38bdf8 100%);
  border-color: transparent;
}

.btn--accent:hover:not(:disabled) {
  color: #0c0f14;
  filter: brightness(1.08);
}

.btn--accent:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: none;
}

.btn--warn.is-active {
  border-color: var(--warn);
  color: var(--warn);
  box-shadow: 0 0 0 1px rgba(251, 191, 36, 0.25);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.bg-mode {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.bg-mode fieldset {
  margin: 0;
  padding: 0;
  border: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  align-items: center;
}

.bg-mode legend {
  padding: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dim);
}

.bg-mode label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.canvas-wrap {
  position: relative;
  overflow: auto;
  max-width: 100%;
  max-height: min(75vh, 720px);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #000;
  min-height: 120px;
}

.canvas-wrap.is-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.canvas-wrap.is-empty #wbCanvas {
  display: none;
}

.canvas-wrap.is-empty .canvas-placeholder {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.canvas-wrap:not(.is-empty) .canvas-placeholder {
  display: none;
}

.wb-zoom {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0.5rem 0 0.35rem;
}

.wb-zoom-sep {
  width: 1px;
  height: 1.35rem;
  margin: 0 0.15rem;
  background: var(--border);
}

.btn--pan {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.5rem;
}

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

.wb-icon-hand {
  display: block;
}

.canvas-wrap.is-pan-mode {
  cursor: grab;
}

.canvas-wrap.is-pan-mode #wbCanvas {
  cursor: grab;
}

.canvas-wrap.is-pan-mode:active,
.canvas-wrap.is-pan-mode.is-panning {
  cursor: grabbing;
}

.canvas-wrap.is-pan-mode.is-panning #wbCanvas {
  cursor: grabbing;
}

.wb-zoom-label {
  min-width: 3.25rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.btn--zoom {
  min-width: 2rem;
  padding: 0.35rem 0.55rem;
  font-size: 1.1rem;
  line-height: 1;
}

.btn--zoom-text {
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
  margin-left: 0.25rem;
}

#wbCanvas {
  display: block;
  cursor: crosshair;
  touch-action: none;
}

.box-editor {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.75rem;
}

.box-editor label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 0.3rem;
}

.box-editor input[type="text"] {
  width: 100%;
  max-width: 20rem;
  padding: 0.45rem 0.6rem;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.hint {
  margin: 0.65rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.hint kbd {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border);
}

.table-wrap {
  overflow-x: auto;
  margin-top: 0.5rem;
}

table.wb-results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

table.wb-results th,
table.wb-results td {
  padding: 0.45rem 0.55rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table.wb-results th {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-dim);
  white-space: nowrap;
}

table.wb-results th.col-primary,
table.wb-results td.col-primary {
  color: var(--accent);
  font-weight: 600;
}

table.wb-results td.num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: nowrap;
}

table.wb-results tr.is-selected {
  background: rgba(94, 234, 212, 0.06);
}

table.wb-results tr.is-bg td {
  color: var(--warn);
}

table.wb-results tbody tr {
  cursor: pointer;
}

table.wb-results tbody tr:hover {
  background: rgba(94, 234, 212, 0.04);
}

.empty-table {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend span::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 0.35rem;
  vertical-align: -2px;
  border-radius: 2px;
}

.legend .band::before {
  border: 2px solid var(--accent);
  background: rgba(94, 234, 212, 0.15);
}

.legend .global::before {
  border: 2px dashed var(--warn);
  background: rgba(251, 191, 36, 0.12);
}

.legend .sat-red-key::before {
  background: #dc3030;
  border: 1px solid #f87171;
}

.legend .sat-black-key::before {
  background: #000;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

@media (max-width: 640px) {
  .bg-mode {
    margin-left: 0;
    width: 100%;
  }
}