:root {
  --bg: #f5fcff;
  --panel: #ffffff;
  --panel-strong: #f0fbff;
  --ink: #07294d;
  --muted: #466985;
  --line: #b9e9ff;
  --navy: #07294d;
  --navy-soft: #103b69;
  --cyan: #23d5ff;
  --cyan-soft: #dff9ff;
  --cyan-strong: #0fb8e8;
  --shadow: rgba(7, 41, 77, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Glacial Indifference", "Avenir Next", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.shell {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.hero,
.composer,
.results {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 42px var(--shadow);
}

.hero {
  padding: 30px;
  background: var(--panel);
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--cyan-strong);
  font-weight: 700;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 0.94;
  letter-spacing: -0.03em;
  max-width: none;
}

.subcopy {
  margin: 0;
  color: var(--muted);
  max-width: 720px;
  font-size: 17px;
}

.composer {
  margin-top: 18px;
  padding: 20px;
  background: var(--panel);
}

.composer label {
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  line-height: 1.5;
  box-shadow: inset 0 0 0 1px rgba(35, 213, 255, 0.06);
}

textarea:focus {
  outline: 2px solid rgba(35, 213, 255, 0.35);
  outline-offset: 2px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  transition:
    transform 120ms ease,
    box-shadow 120ms ease,
    background-color 120ms ease,
    border-color 120ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button.primary {
  background: var(--navy);
  color: #fff;
  box-shadow: 0 10px 20px rgba(7, 41, 77, 0.18);
}

button.secondary {
  background: var(--cyan-soft);
  color: var(--navy);
  border-color: rgba(35, 213, 255, 0.34);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status {
  min-height: 24px;
  margin: 12px 0 0;
  color: var(--muted);
  font-weight: 700;
}

.status.error {
  color: #8f2047;
}

.results {
  margin-top: 18px;
  padding: 18px;
  background: var(--panel);
}

.hidden {
  display: none;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 1080px;
}

th,
td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

th {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 700;
}

.network-cell .summary {
  font-weight: bold;
}

.layer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.layer-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: bold;
  border: 1px solid transparent;
  white-space: nowrap;
}

.layer-name {
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 11px;
}

.layer-value {
  font-size: 13px;
}

.grade-excellent {
  background: rgba(32, 161, 64, 0.12);
  color: #196b2c;
  border-color: rgba(32, 161, 64, 0.24);
}

.grade-good {
  background: rgba(224, 168, 0, 0.14);
  color: #8d5a00;
  border-color: rgba(224, 168, 0, 0.24);
}

.grade-poor {
  background: rgba(224, 108, 0, 0.14);
  color: #9a4e00;
  border-color: rgba(224, 108, 0, 0.24);
}

.grade-none {
  background: rgba(182, 0, 0, 0.12);
  color: #8f1f1f;
  border-color: rgba(182, 0, 0, 0.2);
}

.grade-error,
.grade-na {
  background: rgba(117, 117, 117, 0.12);
  color: #626262;
  border-color: rgba(117, 117, 117, 0.2);
}

.network-cell details {
  margin-top: 8px;
}

.detail-copy {
  white-space: pre-wrap;
  color: var(--muted);
  font-size: 14px;
  margin-top: 6px;
}

.muted {
  color: var(--muted);
  font-size: 14px;
}

code {
  font-family: inherit;
  background: var(--cyan-soft);
  color: var(--navy);
  padding: 2px 6px;
  border-radius: 999px;
}

@media (max-width: 720px) {
  .shell {
    padding: 18px 14px 32px;
  }

  .hero,
  .composer,
  .results {
    border-radius: 14px;
  }
}