:root {
  --bg: #f5f5f7;
  --bg-alt: #ffffff;
  --ink: #0c0c0f;
  --ink-soft: #48484f;
  --muted: #65656a;
  --line: rgba(12, 12, 15, 0.09);
  --line-strong: rgba(12, 12, 15, 0.16);

  --terminal: #101014;
  --terminal-bar: #17171c;
  --terminal-line: rgba(255, 255, 255, 0.12);
  --terminal-soft: rgba(255, 255, 255, 0.06);
  --terminal-text: #d7d7de;
  --terminal-muted: #8b8b93;

  --accent: #4a3aff;
  --accent-bright: #6a5cff;
  --accent-light: #9b93ff;
  --accent-glow: rgba(74, 58, 255, 0.35);

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;

  --max-width: 680px;
  --radius-sm: 12px;
  --radius-md: 22px;
  --radius-lg: 32px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
  color: #fff;
}

h1 { font-size: clamp(1.9rem, 4.6vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3.4vw, 1.85rem); }

p { margin: 0 0 1em; color: var(--terminal-text); }

button { font: inherit; }

.backdrop {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.backdrop-word {
  position: absolute;
  top: 6rem;
  left: 2rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: min(11vw, 150px);
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(12, 12, 15, 0.09);
}

.backdrop-code {
  position: absolute;
  right: 2rem;
  bottom: 2.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 1.5vw, 1.25rem);
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.08;
  filter: blur(1.5px);
  white-space: pre;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 245, 247, 0.86);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.15rem 1.5rem 0.9rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.brand-mark {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--accent);
  margin-right: 0.15em;
}

.progress-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.progress-track {
  height: 2px;
  background: var(--line);
}

.progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.5s var(--ease);
}

.stage {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
}

.card {
  background: var(--terminal);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 60px -25px rgba(12, 12, 15, 0.35);
  animation: rise 0.5s var(--ease) both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.7rem 0.9rem;
  background: var(--terminal-bar);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }

.browser-url {
  margin-left: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--terminal-muted);
}

.card-body { padding: 2.2rem 2rem 1.9rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin: 0 0 1.1em;
}

.lead {
  font-size: 1rem;
  color: var(--terminal-text);
  max-width: 46ch;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 1.8rem 0 0;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  width: 100%;
  text-align: left;
  padding: 0.95rem 1.1rem;
  background: var(--terminal-soft);
  border: 1px solid var(--terminal-line);
  border-radius: var(--radius-sm);
  color: var(--terminal-text);
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}

.option:hover {
  border-color: var(--accent-bright);
  transform: translateY(-1px);
}

.option.selected {
  border-color: var(--accent-bright);
  background: rgba(106, 92, 255, 0.2);
  color: #fff;
}

.option-marker {
  flex: none;
  width: 17px;
  height: 17px;
  margin-top: 0.3rem;
  border-radius: 50%;
  border: 1px solid var(--terminal-line);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.option.selected .option-marker {
  border-color: var(--accent-light);
  box-shadow: inset 0 0 0 4px var(--accent-light);
}

.option-text { flex: 1; }

.field {
  display: grid;
  gap: 0.5rem;
  margin: 1.8rem 0 0;
}

.field-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--terminal-text);
}

.text-input,
.text-area {
  width: 100%;
  font: inherit;
  padding: 0.85em 1em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--terminal-line);
  background: var(--terminal-soft);
  color: var(--terminal-text);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.text-area {
  resize: vertical;
  line-height: 1.6;
  min-height: 9rem;
}

.text-input:focus,
.text-area:focus {
  outline: none;
  border-color: var(--accent-bright);
  box-shadow: 0 0 0 4px rgba(106, 92, 255, 0.25);
}

.text-input::placeholder,
.text-area::placeholder { color: var(--terminal-muted); }

.counter {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--terminal-muted);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.2rem;
  padding-top: 1.6rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.8em 1.7em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.btn::before,
.btn::after {
  font-family: var(--font-mono);
  font-weight: 500;
  opacity: 0;
  max-width: 0;
  overflow: hidden;
  display: inline-block;
  transition: opacity 0.3s var(--ease), max-width 0.4s var(--ease), margin 0.4s var(--ease);
}

.btn::before { content: '<'; }
.btn::after { content: '/>'; }

.btn:not(:disabled):hover::before,
.btn:not(:disabled):hover::after {
  opacity: 0.6;
  max-width: 1.4em;
}

.btn:not(:disabled):hover::before { margin-right: 0.15em; }
.btn:not(:disabled):hover::after { margin-left: 0.15em; }

.btn-primary {
  background: var(--accent-bright);
  color: #fff;
}

.btn-primary:not(:disabled):hover {
  background: var(--accent);
  box-shadow: 0 10px 24px -8px var(--accent-glow);
}

.btn-primary:disabled {
  background: var(--terminal-soft);
  color: var(--terminal-muted);
  border-color: var(--terminal-line);
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--terminal-text);
  border-color: var(--terminal-line);
}

.btn-ghost:hover {
  color: #fff;
  border-color: var(--terminal-text);
}

.btn-small {
  font-size: 0.85rem;
  padding: 0.6em 1.3em;
}

.card-done .lead { max-width: 52ch; }

.debug {
  margin-top: 2.2rem;
  padding-top: 1.6rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.debug-panel {
  margin-top: 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.debug-code {
  width: 100%;
  margin: 0;
  padding: 1.2rem 1.3rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--terminal-text);
  overflow-x: auto;
  white-space: pre;
}

@media (max-width: 1100px) {
  .backdrop-word { display: none; }
}

@media (max-width: 760px) {
  .backdrop-code { display: none; }
}

@media (max-width: 560px) {
  .stage { padding: 2.25rem 1.1rem 4rem; }
  .card { border-radius: var(--radius-md); }
  .card-body { padding: 1.7rem 1.35rem 1.5rem; }
  .btn { padding: 0.8em 1.35em; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}