@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@600;700&family=Inter:wght@400;500;600&display=swap');

:root {
  --black: #0a0a0a;
  --white: #fafafa;
  --blue: #2563eb;
  --gray: #64748b;
  --line: #e5e7eb;
  --surface: #ffffff;
  --font-title: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.nav {
  border-bottom: 1px solid var(--line);
  padding: 1.1rem 1.5rem;
}
.brand {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.05rem;
}
.brand__accent {
  color: var(--blue);
}

.container {
  width: 100%;
  max-width: 880px;
  margin-inline: auto;
  padding: 2.5rem 1.5rem 4rem;
  flex: 1;
}

h1 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  letter-spacing: -0.02em;
}

.lead {
  margin-top: 0.8rem;
  color: var(--gray);
  max-width: 60ch;
}

.layout {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.6rem;
  background: var(--surface);
}

.panel--preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

label:not(:first-child) {
  margin-top: 1.4rem;
}

textarea,
select {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
}

textarea:focus,
select:focus {
  outline: none;
  border-color: var(--blue);
}

.icon-choice {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.icon-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.4rem;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--gray);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.icon-option:has(input:checked) {
  border-color: var(--blue);
  color: var(--black);
}

.icon-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.icon-preview {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 6px;
}

.icon-upload-placeholder {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--line);
  border-radius: 6px;
  font-size: 1.1rem;
  color: var(--gray);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 1.8rem;
  padding: 0.85rem 1.5rem;
  border-radius: 8px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-size: 0.98rem;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn--primary {
  background: var(--black);
  color: var(--white);
}
.btn--primary:hover {
  background: var(--blue);
  transform: translateY(-2px);
}

.btn--ghost {
  border: 1px solid var(--line);
  color: var(--black);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--black);
  transform: translateY(-2px);
}

.qr-holder {
  width: 100%;
  aspect-ratio: 1;
  max-width: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.qr-holder canvas,
.qr-holder img {
  max-width: 100%;
  height: auto;
  display: block;
}

.placeholder {
  color: var(--gray);
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem;
  text-align: center;
  color: var(--gray);
  font-size: 0.85rem;
}

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