:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background-color: #0f1115;
  color: #f5f7fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 24px;
  background-color: #0f1115;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.app__header h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.app__header p {
  margin: 0;
  color: #cbd5f0;
}

.panel {
  background: #1b1f2a;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.panel h2 {
  margin-top: 0;
  font-size: 20px;
}

.panel__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  background: #3b82f6;
  color: #ffffff;
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.2s ease;
}

.btn:hover {
  box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
  transform: translateY(-1px);
}

.panel__hint {
  margin-top: 12px;
  color: #a7b1d6;
}

.settings {
  display: grid;
  gap: 16px;
}

.setting {
  background: #111827;
  border-radius: 12px;
  padding: 12px 14px;
}

.setting__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.setting__hint {
  margin: 8px 0 0;
  color: #94a3b8;
  font-size: 14px;
}

.setting__label {
  display: block;
  margin-bottom: 8px;
  color: #e2e8f0;
}

.select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #334155;
  background: #0f172a;
  color: #f8fafc;
}

input[type="range"] {
  width: 100%;
}

.toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.toggle input {
  display: none;
}

.toggle__track {
  width: 46px;
  height: 26px;
  border-radius: 999px;
  background: #475569;
  position: relative;
  transition: background 0.2s ease;
}

.toggle__track::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #f8fafc;
  top: 2px;
  left: 2px;
  transition: transform 0.2s ease;
}

.toggle input:checked + .toggle__track {
  background: #22c55e;
}

.toggle input:checked + .toggle__track::after {
  transform: translateX(20px);
}

.panel--warning {
  border: 1px solid #f59e0b;
}

code {
  background: #0f172a;
  padding: 2px 6px;
  border-radius: 6px;
  color: #93c5fd;
}