:root {
  --bg-base: #6b6e75;
  --bg-deep: #545862;
  --panel: rgba(20, 23, 34, 0.66);
  --text: #eef3ff;
  --muted: #c6ccdf;
  --primary: #3f70ff;
  --accent-cyan: #9be8ff;
  --accent-blue: #2a8dff;
  --accent-violet: #5e18e5;
  --accent-magenta: #d018ff;
  --danger: #ff7678;
  --success: #7effc8;
  --border: rgba(164, 178, 232, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at 22% 24%, rgba(155, 232, 255, 0.44) 0%, rgba(155, 232, 255, 0) 33%),
    radial-gradient(circle at 67% 58%, rgba(208, 24, 255, 0.52) 0%, rgba(208, 24, 255, 0) 37%),
    radial-gradient(circle at 58% 46%, rgba(94, 24, 229, 0.48) 0%, rgba(94, 24, 229, 0) 30%),
    linear-gradient(160deg, var(--bg-base) 0%, var(--bg-deep) 100%);
  color: var(--text);
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.brand-hero {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1rem;
  border-radius: 16px;
  background: linear-gradient(140deg, rgba(12, 15, 24, 0.68), rgba(39, 19, 86, 0.62));
  border: 1px solid var(--border);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 18px 50px rgba(16, 10, 50, 0.38);
}

.brand-logo {
  width: 100%;
  max-width: 100px;
  filter: drop-shadow(0 0 28px rgba(208, 24, 255, 0.4));
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-cyan);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: 0.02em;
  background: linear-gradient(92deg, var(--accent-cyan), #dbe8ff 40%, #f3d2ff 55%, var(--accent-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin-top: 0.5rem;
  color: var(--muted);
}

.brand-chips {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.brand-chips span {
  font-size: 0.74rem;
  padding: 0.35rem 0.5rem;
  border-radius: 999px;
  background: rgba(155, 232, 255, 0.14);
  border: 1px solid rgba(155, 232, 255, 0.32);
  color: #e7f8ff;
}

.promo-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.promo-card {
  background: rgba(13, 16, 25, 0.64);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem;
  box-shadow: 0 14px 30px rgba(9, 8, 23, 0.28);
}

.promo-tag {
  margin: 0;
  color: var(--accent-cyan);
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.promo-card h3 {
  margin: 0.3rem 0 0.4rem;
}

.promo-copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.promo-card a {
  display: inline-block;
  margin-top: 0.7rem;
  color: #fff;
  text-decoration: none;
  font-size: 0.83rem;
  font-weight: 700;
  background: linear-gradient(120deg, rgba(42, 141, 255, 0.9), rgba(94, 24, 229, 0.88));
  border: 1px solid rgba(184, 167, 255, 0.45);
  border-radius: 8px;
  padding: 0.38rem 0.6rem;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.promo-card a:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(50, 21, 156, 0.35);
}

.panel {
  margin-top: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  display: grid;
  gap: 1rem;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 18px 50px rgba(16, 10, 50, 0.38);
  backdrop-filter: blur(7px);
}

.field {
  display: grid;
  gap: 0.5rem;
}

.field input[type="file"] {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem;
  background: rgba(16, 19, 30, 0.55);
  color: var(--text);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

button {
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  cursor: pointer;
  background: linear-gradient(120deg, var(--accent-blue) 0%, var(--accent-violet) 55%, var(--accent-magenta) 100%);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(94, 24, 229, 0.45);
}

button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.status {
  min-height: 1.2rem;
  margin-top: 1rem;
}

.status[data-tone="error"] {
  color: var(--danger);
}

.status[data-tone="success"] {
  color: var(--success);
}

.result {
  margin-top: 1rem;
  background: var(--panel);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1rem;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 18px 50px rgba(16, 10, 50, 0.34);
}

.hidden {
  display: none;
}

.preview-wrap {
  margin-top: 0.75rem;
}

.preview-hint {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.checkerboard {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  background-image:
    linear-gradient(45deg, #2e3140 25%, transparent 25%),
    linear-gradient(-45deg, #2e3140 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2e3140 75%),
    linear-gradient(-45deg, transparent 75%, #2e3140 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-color: #232633;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 260px;
}

#preview,
#live-preview-image {
  max-width: 100%;
  max-height: 540px;
  object-fit: contain;
}

.download {
  display: inline-block;
  margin-top: 1rem;
  text-decoration: none;
  background: linear-gradient(120deg, var(--accent-violet) 0%, var(--accent-magenta) 100%);
  color: #fff;
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(129, 18, 230, 0.35);
}

@media (max-width: 640px) {
  .container {
    padding-top: 1.25rem;
  }

  .brand-hero {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }

  .brand-chips {
    justify-content: center;
  }

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

  .checkerboard {
    min-height: 200px;
  }
}