:root {
  --bg-1: #0b1e36;
  --bg-2: #145277;
  --card: rgba(255, 255, 255, 0.14);
  --card-border: rgba(255, 255, 255, 0.24);
  --text: #f4f8ff;
  --muted: #d4e6ff;
  --accent: #75d1ff;
  --accent-2: #83ffa7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 15% 15%, #1f6ba0 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, #1f89a0 0%, transparent 45%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
  display: grid;
  place-items: center;
  padding: 20px;
}

.app {
  width: min(760px, 100%);
  display: grid;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.7rem);
}

.eyebrow,
.sub {
  margin: 0;
  color: var(--muted);
}

.panel {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 16px;
  backdrop-filter: blur(8px);
}

.controls {
  display: grid;
  gap: 10px;
}

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

input,
button {
  border: none;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 1rem;
}

input {
  flex: 1;
  background: rgba(255, 255, 255, 0.92);
}

button {
  cursor: pointer;
  font-weight: 700;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #07354f;
}

button.ghost {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
  border: 1px solid var(--card-border);
}

.status {
  text-align: center;
}

.location,
.target,
.message {
  margin: 8px 0;
}

.countdown {
  margin: 12px 0;
  font-size: clamp(2rem, 10vw, 4.2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}

footer {
  text-align: center;
  color: var(--muted);
}

@media (max-width: 520px) {
  .input-row {
    flex-direction: column;
  }

  button,
  input {
    width: 100%;
  }
}