* {
  box-sizing: border-box;
}

:root {
  color-scheme: light dark;

  --bg: #f4f6f8;
  --text: #1f2937;
  --muted: #6b7280;
  --card: #ffffff;
  --border: #d1d5db;
  --border-soft: #e5e7eb;
  --input-bg: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #e5e7eb;
  --secondary-hover: #d1d5db;
  --secondary-text: #111827;
  --status-bg: #f9fafb;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  --button-shadow: 0 6px 14px rgba(37, 99, 235, 0.18);
  --button-shadow-secondary: 0 6px 14px rgba(0, 0, 0, 0.08);
  --canvas-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
  --checker-a: #f3f4f6;
  --checker-b: transparent;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --card: #111827;
    --border: #374151;
    --border-soft: #334155;
    --input-bg: #0b1220;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #1f2937;
    --secondary-hover: #374151;
    --secondary-text: #e5e7eb;
    --status-bg: #0b1220;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    --button-shadow: 0 6px 14px rgba(59, 130, 246, 0.28);
    --button-shadow-secondary: 0 6px 14px rgba(0, 0, 0, 0.25);
    --canvas-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
    --checker-a: #1e293b;
    --checker-b: transparent;
  }
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
}

.app {
  width: 100%;
  padding: 32px 16px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.card {
  width: 100%;
  max-width: 760px;
  background: var(--card);
  border-radius: 18px;
  padding: 28px;
  box-shadow: var(--shadow);
}

h1 {
  margin: 0 0 10px 0;
  font-size: 28px;
  line-height: 1.2;
}

.subtitle {
  margin: 0 0 24px 0;
  color: var(--muted);
  line-height: 1.5;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 18px;
  margin-top: 18px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

textarea,
input[type="number"],
input[type="file"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 15px;
  background: var(--input-bg);
  color: var(--text);
}

textarea::placeholder,
input::placeholder {
  color: var(--muted);
}

textarea {
  min-height: 110px;
  resize: vertical;
  line-height: 1.4;
}

textarea:focus,
input[type="number"]:focus,
input[type="file"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 8px 0 24px 0;
}

button {
  appearance: none;
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  background: var(--primary);
  color: #ffffff;
  transition:
    background 0.2s ease,
    transform 0.15s ease,
    box-shadow 0.2s ease;
  box-shadow: var(--button-shadow);
}

button:hover {
  background: var(--primary-hover);
}

button:active {
  transform: translateY(1px);
}

button.secondary {
  background: var(--secondary);
  color: var(--secondary-text);
  box-shadow: var(--button-shadow-secondary);
}

button.secondary:hover {
  background: var(--secondary-hover);
}

.preview-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px;
  border-radius: 16px;
  background:
    linear-gradient(45deg, var(--checker-a) 25%, var(--checker-b) 25%),
    linear-gradient(-45deg, var(--checker-a) 25%, var(--checker-b) 25%),
    linear-gradient(45deg, var(--checker-b) 75%, var(--checker-a) 75%),
    linear-gradient(-45deg, var(--checker-b) 75%, var(--checker-a) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  border: 1px solid var(--border-soft);
  overflow: hidden;
}

#qrCanvas {
  display: block;
  width: min(100%, 420px);
  height: auto;
  aspect-ratio: 1 / 1;
  max-width: 100%;
  object-fit: contain;
  background: transparent;
  border-radius: 12px;
  box-shadow: var(--canvas-shadow);
  image-rendering: auto;
}

.status {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(120, 150, 220, 0.22);
  background: rgba(6, 14, 30, 0.82);
  color: #dbe7ff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
  transition:
    color 1.4s ease,
    border-color 1.4s ease,
    background-color 1.4s ease,
    box-shadow 1.4s ease,
    transform 0.25s ease;
}

.status.flash-success {
  color: #eafff1;
  border-color: rgba(60, 220, 120, 0.95);
  background: rgba(30, 120, 60, 0.28);
  box-shadow:
    0 0 0 1px rgba(60, 220, 120, 0.18),
    0 0 24px rgba(60, 220, 120, 0.22),
    inset 0 0 18px rgba(60, 220, 120, 0.12);
}

.status.flash-error {
  color: #fff1f1;
  border-color: rgba(255, 90, 90, 0.95);
  background: rgba(140, 35, 35, 0.28);
  box-shadow:
    0 0 0 1px rgba(255, 90, 90, 0.16),
    0 0 24px rgba(255, 90, 90, 0.20),
    inset 0 0 18px rgba(255, 90, 90, 0.10);
}

@media (max-width: 640px) {
  .app {
    padding: 18px 12px;
  }

  .card {
    padding: 20px;
    border-radius: 14px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .button-row {
    flex-direction: column;
  }

  button {
    width: 100%;
  }

  h1 {
    font-size: 24px;
  }

  #qrCanvas {
    width: min(100%, 340px);
  }
}

.drop-zone {
  position: relative;
  border: 2px dashed rgba(120, 120, 140, 0.45);
  border-radius: 18px;
  padding: 20px;
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(10px);
}

.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: rgba(90, 120, 255, 0.8);
  background: rgba(255, 255, 255, 0.62);
}

.drop-zone.dragover {
  border-color: rgba(70, 110, 255, 1);
  background: rgba(90, 120, 255, 0.12);
  transform: scale(1.01);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.drop-zone-content strong {
  font-size: 1rem;
}

.drop-zone-content span {
  font-size: 0.92rem;
  opacity: 0.75;
}

.logo-carousel {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 8px 2px 4px;
  scrollbar-width: thin;
}

.logo-carousel.empty {
  display: block;
}

.logo-carousel-empty {
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(120, 120, 140, 0.18);
  color: inherit;
  opacity: 0.75;
}

.logo-thumb {
  flex: 0 0 auto;
  width: 78px;
  height: 78px;
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.72);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.logo-thumb:hover {
  transform: translateY(-2px);
  border-color: rgba(90, 120, 255, 0.65);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}

.logo-thumb.active {
  border-color: rgba(70, 110, 255, 1);
  box-shadow: 0 0 0 3px rgba(70, 110, 255, 0.16);
}

.logo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: transparent;
}