:root {
  --bg: #f6f8fa;
  --card-bg: #ffffff;
  --text: #1a1f36;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #635bff;
  --primary-hover: #5851e6;
  --error: #b91c1c;
  --error-bg: #fef2f2;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --card-bg: #181b23;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2a2e3a;
    --primary: #7a73ff;
    --primary-hover: #8b85ff;
    --error: #f87171;
    --error-bg: #2a1515;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

.header {
  text-align: center;
  margin-bottom: 28px;
}

.logo {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

h1 {
  font-size: 24px;
  margin: 0 0 4px;
}

h2 {
  font-size: 17px;
  margin: 0 0 10px;
}

.subtitle {
  color: var(--muted);
  margin: 0;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 18px;
}

.card p {
  margin: 0 0 14px;
}

.card ol {
  margin: 0 0 14px;
  padding-left: 22px;
}

.card li {
  margin-bottom: 6px;
}

code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  font-size: 13px;
  word-break: break-all;
}

a {
  color: var(--primary);
}

.muted {
  color: var(--muted);
  font-size: 14px;
}

.hidden {
  display: none !important;
}

.btn-primary,
.btn-secondary {
  font: inherit;
  font-weight: 600;
  border-radius: 8px;
  padding: 10px 18px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: default;
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--primary);
}

a.btn-primary,
a.btn-secondary {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  box-sizing: border-box;
}

.card.center {
  text-align: center;
  padding: 32px 26px;
}

.result-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 700;
}

.result-icon.success {
  background: #dcfce7;
  color: #15803d;
}

.result-icon.incomplete {
  background: #fef9c3;
  color: #a16207;
}

@media (prefers-color-scheme: dark) {
  .result-icon.success {
    background: #14321f;
    color: #4ade80;
  }

  .result-icon.incomplete {
    background: #332a10;
    color: #facc15;
  }
}

.error {
  background: var(--error-bg);
  color: var(--error);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 14px 0 0;
  font-size: 14px;
}