:root {
  --bg: #03050b;
  --bg-alt: #080c1c;
  --panel: rgba(11, 15, 33, 0.95);
  --border: rgba(255, 255, 255, 0.08);
  --muted: #a7b0d1;
  --accent: #3de8b8;
  --accent-dark: #0b9f7f;
  --ghost: rgba(255, 255, 255, 0.08);
  --font: 'Space Grotesk', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: #f6f8ff;
  background: radial-gradient(circle at top, #161b3c, #03050b 55%);
}

.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.tag {
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 0.4rem;
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  align-items: center;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2.3rem, 4vw, 3.2rem);
}

.hero-copy {
  margin: 0;
  color: var(--muted);
  max-width: 540px;
}

.cta-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
}

.hero-card {
  padding: 1.5rem;
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(61, 232, 184, 0.2), rgba(11, 15, 33, 0.8));
  border: 1px solid var(--border);
  box-shadow: 0 25px 40px rgba(0, 0, 0, 0.35);
}

.hero-card h2 {
  margin: 0.5rem 0;
  font-size: 2.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.panel {
  background: var(--panel);
  border-radius: 24px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
}

.panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.panel h2 {
  margin: 0;
}

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

textarea {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 1rem;
  background: #070a15;
  color: #fff;
  font-size: 1rem;
}

textarea:focus {
  outline: 2px solid var(--accent);
}

.palette {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
}

.palette button {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.85rem;
  background: var(--bg-alt);
  color: #fff;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.palette button.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.swatch {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.2);
}

.cube-builder {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.face {
  padding: 0.75rem;
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: 16px;
}

.face h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--muted);
}

.cube-builder .grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
}

.sticker {
  width: 100%;
  padding-top: 100%;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  background: #121a33;
  cursor: pointer;
  position: relative;
  appearance: none;
  outline: none;
}

.sticker.fixed {
  cursor: not-allowed;
  opacity: 0.85;
}

.sticker::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 7px;
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.upload {
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 1.25rem;
  text-align: center;
  cursor: pointer;
}

.upload input {
  display: none;
}

.upload span {
  color: var(--muted);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}

.gallery figure {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
}

.gallery img {
  width: 100%;
  border-radius: 8px;
  object-fit: cover;
}

.gallery figcaption {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button,
.primary,
.ghost {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-dark));
  color: #051513;
}

.ghost {
  background: var(--ghost);
  border-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

button:active,
.primary:active,
.ghost:active {
  transform: scale(0.97);
}

.result {
  grid-column: 1 / -1;
}

.result-head h3 {
  margin: 0.35rem 0 0.2rem;
  font-size: 1.5rem;
}

.result-steps {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.result-steps ol {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.result-steps li {
  color: #fff;
}

.info ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.result.success {
  border-color: rgba(61, 232, 184, 0.5);
}

.result.error {
  border-color: rgba(255, 99, 132, 0.6);
}

@media (max-width: 640px) {
  .panel header {
    flex-direction: column;
    align-items: flex-start;
  }
  .result {
    order: -1;
  }
}