:root {
  color-scheme: dark;
  --cad-black: #f0f0f0;
  --cad-dark: #e0e0e0;
  --cad-gray: #a0a0a0;
  --cad-light: #707070;
  --cad-faint: #404040;
  --cad-white: #1a1a1a;
  --paper-bg: #1a1a1a;
  --grid-line: #2a2a2a85;
  --grid-line-major: #333333;
  --border: #333333;
  --accent: #e0e0e0;
  --accent-strong: #f0f0f0;
  --error: #d36b6b;
  --grid-base: 24px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Consolas, Monaco, "Courier New", monospace;
  color: var(--cad-black);
  background: var(--paper-bg);
  min-height: 100vh;
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -20;
  background: var(--paper-bg);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -10;
  background-image:
    linear-gradient(var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-major) 1px, transparent 1px),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size:
    calc(var(--grid-base) * 4) calc(var(--grid-base) * 4),
    calc(var(--grid-base) * 4) calc(var(--grid-base) * 4),
    var(--grid-base) var(--grid-base),
    var(--grid-base) var(--grid-base);
  background-position:
    0 calc(50% - 36px),
    calc(50% - 48.5px) 0,
    0 50%,
    calc(50% - 12.5px) 0;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 16px;
}

.card {
  background: #1f1f1f;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: min(680px, 100%);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0 0 24px;
  color: var(--cad-gray);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.field span {
  font-weight: 600;
  color: var(--cad-dark);
}

input,
select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  background: #1a1a1a;
  color: var(--cad-black);
}

input.disabled,
select.disabled {
  background: #171717;
  color: var(--cad-gray);
}

input:read-only {
  cursor: not-allowed;
}

button.primary,
a.primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--cad-dark);
  background: transparent;
  color: var(--cad-dark);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

button.primary:hover,
a.primary:hover {
  color: var(--accent-strong);
  border-color: var(--accent-strong);
}

button.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #1a1a1a;
  color: var(--cad-dark);
  font-weight: 600;
  cursor: pointer;
}

button.secondary:hover {
  color: var(--accent-strong);
  border-color: var(--accent-strong);
}

.row {
  display: flex;
  gap: 16px;
}

.row.space-between {
  justify-content: space-between;
}

.row .field {
  flex: 1;
}

.status {
  margin-top: 16px;
  color: var(--cad-gray);
}

.status.error {
  color: var(--error);
}

.status.loading {
  color: var(--cad-gray);
}

.dot {
  display: inline-block;
  width: 0.6ch;
  text-align: left;
  opacity: 0.2;
  animation: dotPulse 1.2s infinite;
}

.dot1 {
  animation-delay: 0s;
}

.dot2 {
  animation-delay: 0.2s;
}

.dot3 {
  animation-delay: 0.4s;
}

@keyframes dotPulse {
  0% {
    opacity: 0.2;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.2;
  }
}

.progress {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #141414;
  border: 1px solid #4a4a4a;
  box-shadow: inset 0 0 0 1px #2b2b2b;
  overflow: hidden;
  margin-bottom: 12px;
}


.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0 20px;
  color: var(--cad-dark);
}

.hidden {
  display: none !important;
}

.progress.visible {
  display: block;
}

@media (max-width: 640px) {
  .row {
    flex-direction: column;
  }
}