:root {
  --bg: #050817;
  --bg-soft: rgba(15, 23, 42, 0.65);
  --card-bg: rgba(13, 17, 34, 0.85);
  --border-neon: rgba(100, 255, 218, 0.4);
  --accent-neon: #64ffda;
  --accent-blue: #4f46e5;
  --text: #f8fafc;
  --muted: #94a3b8;
  --error: #f87171;
  --success: #34d399;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Space Grotesk', 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top, rgba(79, 70, 229, 0.25), transparent 55%),
              radial-gradient(circle at 20% 20%, rgba(100, 255, 218, 0.2), transparent 35%),
              var(--bg);
  color: var(--text);
}

.main-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem 3rem;
}

h1 {
  font-size: 2.5rem;
  margin: 0 0 0.5rem;
  color: var(--accent-neon);
  text-shadow: 0 0 15px rgba(100, 255, 218, 0.4);
}

.subtitle {
  color: var(--muted);
  margin-bottom: 2rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 960px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-neon);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: 0 10px 60px rgba(5, 8, 23, 0.65);
  backdrop-filter: blur(20px);
}

.card h2 {
  margin-top: 0;
  font-size: 1.4rem;
  color: var(--accent-neon);
}

label {
  display: block;
  margin-bottom: 0.3rem;
  font-weight: 600;
}

input {
  width: 100%;
  border: 1px solid rgba(100, 255, 218, 0.25);
  background: rgba(2, 6, 23, 0.6);
  color: var(--text);
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  font-size: 1rem;
}

input:focus {
  outline: none;
  border-color: var(--accent-neon);
  box-shadow: 0 0 12px rgba(100, 255, 218, 0.3);
}

button {
  width: 100%;
  border: none;
  border-radius: 10px;
  padding: 0.85rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  color: #020617;
  background: linear-gradient(120deg, var(--accent-neon), var(--accent-blue));
  box-shadow: 0 10px 35px rgba(100, 255, 218, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(100, 255, 218, 0.45);
}

button.secondary {
  background: transparent;
  color: var(--accent-neon);
  border: 1px solid var(--border-neon);
  box-shadow: none;
}

.link-button {
  background: none;
  border: none;
  color: var(--accent-neon);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

.notice {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.notice.error {
  color: var(--error);
  border-color: rgba(248, 113, 113, 0.4);
  background: rgba(248, 113, 113, 0.08);
}

.notice.success {
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.08);
}

.device-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.device-card {
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 12px;
  padding: 1rem;
  background: rgba(15, 23, 42, 0.6);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.device-card h4 {
  margin: 0;
  color: var(--accent-neon);
}

.device-meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.hidden {
  display: none;
}

.actions {
  display: flex;
  gap: 0.75rem;
}

.actions button {
  width: auto;
  padding: 0.6rem 1rem;
}

.footer-note {
  text-align: center;
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}