* {
  box-sizing: border-box;
}

:root {
  --background: #fafafa;
  --foreground: #09090b;
  --card: #ffffff;
  --card-foreground: #09090b;
  --muted: #f4f4f5;
  --muted-foreground: #71717a;
  --border: #e4e4e7;
  --input: #e4e4e7;
  --primary: #18181b;
  --primary-foreground: #fafafa;
  --secondary: #f4f4f5;
  --secondary-foreground: #18181b;
  --accent: #f4f4f5;
  --accent-foreground: #18181b;
  --destructive: #dc2626;
  --success: #15803d;
  --ring: #18181b;
  --radius: 14px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  background:
    linear-gradient(to right, rgba(228, 228, 231, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(228, 228, 231, 0.55) 1px, transparent 1px),
    var(--background);
  background-size: 32px 32px;
  color: var(--foreground);
}

.shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 24px auto;
  display: grid;
  gap: 16px;
}

.hero {
  display: grid;
  gap: 16px;
  align-items: end;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.86);
  color: var(--foreground);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(8px);
}

.hero .eyebrow {
  color: var(--muted-foreground);
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-subtitle {
  margin: 8px 0 0;
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 700;
  color: var(--foreground);
}

.hero-copy {
  max-width: 680px;
  margin: 10px 0 0;
  color: var(--muted-foreground);
  line-height: 1.7;
}

.site-link {
  display: inline-flex;
  margin-top: 14px;
  color: var(--foreground);
  font-weight: 700;
  text-decoration: none;
}

.site-link:hover {
  text-decoration: underline;
}

.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.95fr);
  gap: 16px;
  align-items: start;
}

.panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(8px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted-foreground);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.heading p:last-child {
  margin: 0;
  color: var(--muted-foreground);
}

.form {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--input);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: var(--background);
  color: var(--foreground);
  font: inherit;
}

input:focus {
  outline: 2px solid transparent;
  border-color: var(--ring);
  box-shadow: 0 0 0 2px rgba(24, 24, 27, 0.12);
}

button {
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 14px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.secondary-button {
  border-color: var(--border);
  background: var(--secondary);
  color: var(--secondary-foreground);
}

.message {
  min-height: 22px;
  color: var(--success);
  font-weight: 700;
}

.message.error {
  color: var(--destructive);
}

.toast {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 50;
  max-width: min(360px, calc(100vw - 36px));
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--foreground);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
  font-weight: 700;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.toast.is-error {
  color: var(--destructive);
}

.history-block {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

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

.history {
  color: var(--muted-foreground);
}

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

.step {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--muted);
}

.step-index {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-weight: 800;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.step p {
  margin: 0;
  color: var(--muted-foreground);
  line-height: 1.6;
}

.tip-box {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fefce8;
  color: #713f12;
  line-height: 1.6;
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.code-head p {
  margin: 4px 0 0;
  color: var(--muted-foreground);
  font-size: 13px;
}

.code-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ghost-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--secondary-foreground);
  background: var(--secondary);
  font-weight: 700;
  text-decoration: none;
}

.code-box {
  max-height: 300px;
  overflow: auto;
  margin: 12px 0 0;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #09090b;
  color: #fafafa;
  font-size: 12px;
  line-height: 1.6;
  white-space: pre;
}

.code-box.is-collapsed {
  display: none;
}

.record {
  display: grid;
  grid-template-columns: 90px 1fr 150px;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .main-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .record {
    grid-template-columns: 1fr;
  }

  .code-head {
    align-items: stretch;
    flex-direction: column;
  }

  .code-actions {
    align-items: stretch;
    flex-direction: column;
  }
}