:root {
  --bg: #030912;
  --bg-glow: #0d2e68;
  --panel: rgba(7, 20, 43, 0.9);
  --panel-soft: rgba(9, 28, 57, 0.72);
  --line: rgba(103, 171, 255, 0.35);
  --line-strong: rgba(129, 203, 255, 0.8);
  --text: #e4f1ff;
  --muted: #9eb7d9;
  --accent: #47b4ff;
  --accent-strong: #76d4ff;
  --success: #73f0cb;
  --warn: #ffd27a;
  --danger: #ff8f8f;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(89, 172, 255, 0.28), transparent 35%),
    linear-gradient(180deg, #07111f 0%, var(--bg) 100%);
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 18px 48px;
}

.hero,
.panel,
.nav {
  backdrop-filter: blur(10px);
}

.hero {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(135deg, rgba(12, 32, 66, 0.95), rgba(5, 12, 28, 0.88));
  box-shadow: var(--shadow);
}

.eyebrow,
.panel__kicker,
.helper {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.76rem;
}

.hero__title-row,
.panel__header,
.button-row,
.form-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.hero__title-row {
  margin-top: 10px;
}

.hero h1,
.panel h2 {
  margin: 0;
}

.hero__subtitle {
  margin: 8px 0 0;
  max-width: 720px;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid rgba(118, 212, 255, 0.65);
  border-radius: 999px;
  background: rgba(20, 77, 145, 0.35);
  color: var(--accent-strong);
  font-size: 0.8rem;
  white-space: nowrap;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(4, 12, 25, 0.8);
  box-shadow: var(--shadow);
}

.nav a,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(103, 171, 255, 0.32);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(18, 56, 108, 0.95), rgba(9, 27, 55, 0.98));
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.nav a:hover,
.nav a.active,
.button:hover,
.button:focus-visible {
  border-color: var(--line-strong);
  box-shadow: 0 0 0 1px rgba(118, 212, 255, 0.3), 0 10px 24px rgba(9, 34, 66, 0.4);
  transform: translateY(-1px);
}

.button--ghost {
  background: rgba(8, 25, 50, 0.8);
}

.layout {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.layout--two-column > .panel {
  grid-column: span 6;
}

.panel {
  grid-column: span 4;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--panel-soft));
  box-shadow: var(--shadow);
}

.panel--wide {
  grid-column: span 8;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.status-card,
.mode-card,
.indicator,
.callout {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(6, 19, 39, 0.82);
}

.status-card__label,
.indicator__label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status-card__value,
.mode-summary__value {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.mode-summary {
  margin: 18px 0;
}

.mode-detail-list,
.indicator-list,
.feature-list,
.button-stack {
  display: grid;
  gap: 12px;
}

.mode-card h3,
.callout p,
.feature-list {
  margin: 0;
}

.mode-card p,
.indicator p,
.message {
  margin: 8px 0 0;
}

.indicator strong {
  color: var(--success);
}

.feature-list {
  padding-left: 18px;
}

.form-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.form-grid label,
.checkbox {
  display: grid;
  gap: 8px;
}

.form-grid span {
  color: var(--muted);
}

input,
select {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid rgba(118, 212, 255, 0.18);
  border-radius: 12px;
  background: rgba(2, 10, 23, 0.9);
  color: var(--text);
}

input[type="file"] {
  padding: 9px;
}

.checkbox {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.checkbox input {
  width: 18px;
  min-height: 18px;
  margin: 0;
}

.button-row--wrap {
  flex-wrap: wrap;
  margin-top: 18px;
}

.form-actions {
  flex-wrap: wrap;
}

.form-actions .button {
  flex: 1 1 220px;
}

.helper,
.message {
  color: var(--muted);
}

.message {
  min-height: 1.25rem;
  color: var(--accent-strong);
}

@media (max-width: 960px) {
  .panel,
  .panel--wide,
  .layout--two-column > .panel {
    grid-column: span 12;
  }
}

@media (max-width: 640px) {
  .shell {
    padding: 18px 14px 32px;
  }

  .hero,
  .panel {
    padding: 18px;
  }

  .hero__title-row,
  .panel__header,
  .button-row,
  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .nav a,
  .button {
    width: 100%;
  }
}