:root {
  --bg: #0b1220;
  --bg-soft: #0f1a2c;
  --panel: #111d31;
  --panel-2: #15243c;
  --border: #243653;
  --text: #e8f1ff;
  --muted: #93a6c4;
  --accent: #58a1d3;
  --accent-2: #2f7fb8;
  --green: #2ca02c;
  --orange: #ff9f43;
  --danger: #ff6b6b;
  --radius: 14px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% -10%, rgba(88, 161, 211, 0.18), transparent 45%),
    radial-gradient(circle at 100% 0%, rgba(88, 161, 211, 0.10), transparent 35%),
    var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.45;
}

button,
input {
  font: inherit;
}

code {
  color: #b9dcff;
  background: rgba(88, 161, 211, 0.12);
  padding: 1px 5px;
  border-radius: 5px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 16px 8px;
  max-width: 1280px;
  margin: 0 auto;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.15rem, 4vw, 1.55rem);
  letter-spacing: -0.02em;
}

.topbar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.badge {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  background: rgba(88, 161, 211, 0.12);
  color: #b9dcff;
  padding: 7px 10px;
  border-radius: 999px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.78rem;
  white-space: nowrap;
}

.method-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  max-width: 1280px;
  margin: 0 auto;
  background: rgba(11, 18, 32, 0.86);
  backdrop-filter: blur(12px);
  overflow-x: auto;
  scrollbar-width: none;
}

.method-nav::-webkit-scrollbar {
  display: none;
}

.method-btn,
.tab-btn,
.segmented button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.method-btn.active,
.tab-btn.active,
.segmented button.active {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #06111d;
  font-weight: 700;
}

.method-btn:hover,
.tab-btn:hover,
.segmented button:hover {
  border-color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 8px 16px 28px;
  max-width: 1280px;
  margin: 0 auto;
}

.card {
  background: linear-gradient(180deg, rgba(21, 36, 60, 0.96), rgba(17, 29, 49, 0.96));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  min-width: 0;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.method-form {
  display: none;
  gap: 12px;
  margin-top: 14px;
}

.method-form.active {
  display: block;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.field span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 161, 211, 0.18);
}

.two-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 12px;
}

.primary {
  width: 100%;
  border: 0;
  border-radius: 11px;
  padding: 13px 16px;
  margin-top: 6px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: #06111d;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(47, 127, 184, 0.28);
}

.primary:disabled {
  opacity: 0.65;
  cursor: wait;
}

.error {
  margin-top: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 107, 107, 0.45);
  background: rgba(255, 107, 107, 0.11);
  color: #ffc2c2;
  border-radius: 10px;
  font-size: 0.86rem;
  white-space: pre-wrap;
}

.hidden {
  display: none;
}

.output-card {
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  border-radius: 9px;
  padding: 8px 11px;
  font-size: 0.82rem;
}

.tab-panel {
  display: none;
  min-width: 0;
  flex: 1;
}

.tab-panel.active {
  display: block;
}

.summary-empty {
  color: var(--muted);
  padding: 24px 4px;
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 12px;
}

.summary-item {
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.6);
  border-radius: 11px;
  padding: 11px 12px;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 3px;
}

.summary-item strong {
  font-size: 1.02rem;
}

.summary-message {
  margin: 10px 0 0;
  color: #b9dcff;
  font-size: 0.9rem;
}

.classification {
  margin-top: 10px;
  border-left: 3px solid var(--accent);
  padding: 8px 12px;
  background: rgba(88, 161, 211, 0.08);
  border-radius: 0 10px 10px 0;
  color: #cfe9ff;
  font-size: 0.88rem;
}

.steps {
  margin: 8px 0 0;
  padding: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 11px;
  color: #dbe9ff;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.55;
  overflow: auto;
  max-height: 58vh;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.legend {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
  margin: 8px 0;
}

.table-wrap {
  overflow: auto;
  max-height: 58vh;
  border: 1px solid var(--border);
  border-radius: 11px;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.78rem;
}

th,
td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
  white-space: nowrap;
}

th {
  position: sticky;
  top: 0;
  background: var(--panel-2);
  color: #b9dcff;
  font-family: Inter, system-ui, sans-serif;
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tbody tr:nth-child(even) {
  background: rgba(88, 161, 211, 0.04);
}

tbody tr:hover {
  background: rgba(88, 161, 211, 0.10);
}

.graph-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.segmented {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 11px;
}

.segmented button {
  border: 0;
  border-radius: 8px;
  padding: 7px 14px;
  background: transparent;
}

.plot {
  width: 100%;
  min-height: 360px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--bg);
  overflow: hidden;
}

.glossary h3 {
  margin: 18px 0 8px;
  color: #b9dcff;
  font-size: 0.98rem;
}

.glossary h3:first-child {
  margin-top: 4px;
}

.glossary dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
}

.glossary dt {
  font-family: Consolas, "Courier New", monospace;
  font-weight: 700;
  color: var(--accent);
  padding-top: 8px;
}

.glossary dd {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  padding-bottom: 7px;
  border-bottom: 1px solid rgba(36, 54, 83, 0.7);
}

.glossary ul {
  margin: 6px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.86rem;
}

.glossary li {
  margin-bottom: 4px;
}

noscript {
  display: block;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px;
  color: #ffc2c2;
}

@media (min-width: 700px) {
  .two-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .glossary dl {
    grid-template-columns: 180px 1fr;
    column-gap: 18px;
  }

  .glossary dt {
    border-bottom: 1px solid rgba(36, 54, 83, 0.7);
  }

  .glossary dd {
    border-bottom: 1px solid rgba(36, 54, 83, 0.7);
  }
}

@media (min-width: 980px) {
  .layout {
    grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.55fr);
    align-items: start;
  }

  .input-card {
    position: sticky;
    top: 62px;
  }

  .plot {
    min-height: 460px;
  }
}