:root {
  --bg-top: #e9f7ff;
  --bg-bottom: #fffdf1;
  --panel-bg: rgba(255, 255, 255, 0.76);
  --text-main: #12253f;
  --text-muted: #4e627f;
  --accent: #0f7a65;
  --accent-strong: #0b5b4c;
  --danger: #ad2e29;
  --success: #0d6b31;
  --border: rgba(18, 37, 63, 0.16);
  --shadow: 0 20px 64px rgba(18, 37, 63, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--text-main);
  font-family: "Chivo", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, var(--bg-top), transparent 50%),
    radial-gradient(circle at bottom right, #fff5d8, transparent 50%),
    linear-gradient(170deg, var(--bg-bottom), #f4fbff);
  overflow: hidden;
}

.aurora {
  position: fixed;
  border-radius: 50%;
  filter: blur(10px);
  pointer-events: none;
  z-index: 0;
  animation: float 12s ease-in-out infinite;
}

.aurora-left {
  width: 280px;
  height: 280px;
  left: -80px;
  top: -120px;
  background: rgba(35, 168, 150, 0.28);
}

.aurora-right {
  width: 320px;
  height: 320px;
  right: -120px;
  bottom: -140px;
  background: rgba(238, 181, 43, 0.3);
  animation-delay: 2s;
}

.panel {
  width: min(680px, 100%);
  z-index: 1;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  padding: 28px;
  animation: slide-up 0.5s ease;
}

.tag {
  margin: 0;
  color: var(--accent-strong);
  letter-spacing: 0.08em;
  font-size: 12px;
  font-weight: 800;
}

h1 {
  margin: 6px 0 10px;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
}

.intro {
  margin: 0 0 22px;
  color: var(--text-muted);
  line-height: 1.55;
}

form {
  display: grid;
  gap: 10px;
}

label {
  font-weight: 600;
  margin-top: 4px;
}

input {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font: inherit;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.92);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hint {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.mono {
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
}

button {
  margin-top: 10px;
  border: none;
  border-radius: 12px;
  padding: 12px 14px;
  color: white;
  font: inherit;
  font-weight: 700;
  background: linear-gradient(130deg, var(--accent), var(--accent-strong));
  cursor: pointer;
  transition: transform 0.2s ease, filter 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(0.97);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.result {
  margin-top: 20px;
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.9);
}

.result h2 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.result p {
  margin: 0;
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
  white-space: pre-wrap;
  line-height: 1.45;
}

.result.error {
  border-color: rgba(173, 46, 41, 0.3);
  background: rgba(255, 245, 244, 0.95);
}

.result.error h2 {
  color: var(--danger);
}

.result.success {
  border-color: rgba(13, 107, 49, 0.35);
  background: rgba(241, 255, 243, 0.95);
}

.result.success h2 {
  color: var(--success);
}

.hidden {
  display: none;
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(0, 18px);
  }
}

@media (max-width: 640px) {
  body {
    padding: 14px;
  }

  .panel {
    padding: 18px;
    border-radius: 16px;
  }
}