:root {
  --bg1: #0b132b;
  --bg2: #1c2541;
  --bg3: #3a506b;
  --text: #ecf5ff;
  --muted: #b9c7da;
  --card: rgba(255, 255, 255, 0.12);
  --card-border: rgba(255, 255, 255, 0.25);
  --ok: #76e39d;
  --warn: #ffd166;
  --bad: #ef476f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, var(--bg3), transparent 40%),
    radial-gradient(circle at 80% 0%, #2f5d8a, transparent 35%),
    linear-gradient(130deg, var(--bg1), var(--bg2));
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 16px 42px;
}

.hero h1 {
  margin: 6px 0 8px;
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
}

.eyebrow {
  margin: 0;
  color: var(--warn);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.8rem;
}

.sub {
  margin: 0;
  color: var(--muted);
  max-width: 72ch;
}

.about-btn {
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.2);
  color: var(--text);
  border: 1px solid var(--card-border);
}

.status {
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 14px;
  backdrop-filter: blur(8px);
}

.pulse {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--warn);
  box-shadow: 0 0 0 0 rgba(255, 209, 102, 0.8);
  animation: pulse 1.6s infinite;
}

.status.ready .pulse {
  background: var(--ok);
  box-shadow: 0 0 0 0 rgba(118, 227, 157, 0.8);
}

.status.error .pulse {
  background: var(--bad);
  box-shadow: 0 0 0 0 rgba(239, 71, 111, 0.8);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 209, 102, 0.8);
  }
  70% {
    box-shadow: 0 0 0 14px rgba(255, 209, 102, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 209, 102, 0);
  }
}

.cards {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px;
  transform: translateY(8px);
  opacity: 0;
  animation: rise 0.45s ease forwards;
}

.card h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.card .value {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
}

.card .hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

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

.result {
  margin-top: 18px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 16px;
}

.result h2 {
  margin: 0;
  font-size: 1.45rem;
}

.result p {
  margin: 8px 0 0;
  color: #f6fbff;
}

.next-refresh {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.meter {
  margin-top: 12px;
}

.meter-track {
  height: 12px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.28);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ok), var(--warn), var(--bad));
  transition: width 700ms ease;
}

#meterLabel {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.86rem;
  color: var(--muted);
}

.history {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.history h3 {
  margin: 0 0 8px;
  font-size: 0.92rem;
  color: #d7e9f9;
}

.history-bars {
  display: flex;
  align-items: end;
  gap: 6px;
  min-height: 60px;
}

.history-bar {
  width: 22px;
  border-radius: 7px 7px 4px 4px;
  background: linear-gradient(180deg, #9feaa5, #ffd166, #ef476f);
  opacity: 0.88;
}

.duel {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.duel h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.duel-hint {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

.duel-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.duel-row input {
  flex: 1 1 260px;
  min-width: 180px;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
  padding: 10px;
}

.duel-row input::placeholder {
  color: #a8bbcf;
}

.duel-code {
  margin: 8px 0 0;
  font-size: 0.84rem;
  color: var(--muted);
}

.duel-code code {
  color: #dff2ff;
  word-break: break-all;
}

.duel-result {
  margin: 8px 0 0;
  font-weight: 700;
}

.actions {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 12px;
  font-weight: 700;
  color: #062030;
  background: #d5ebff;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

button:active {
  transform: translateY(1px);
}

.about-dialog {
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 0;
  width: min(640px, calc(100vw - 24px));
  background: #0d2234;
  color: var(--text);
}

.about-dialog::backdrop {
  background: rgba(1, 8, 15, 0.72);
}

.about-dialog article {
  padding: 16px;
}

.about-dialog h2 {
  margin: 0;
}

.about-dialog p {
  color: var(--muted);
}

.about-dialog ul {
  padding-left: 18px;
}

.about-dialog li {
  margin: 8px 0;
}

.about-dialog a {
  color: #9fd6ff;
}

@media (max-width: 640px) {
  .app {
    padding: 20px 12px 32px;
  }
}