:root {
  --bg-0: #f5f7ff;
  --bg-1: #e6ecff;
  --panel: #ffffff;
  --ink: #111827;
  --muted: #5b6474;
  --line: #d8deec;
  --accent: #f97316;
  --accent-dark: #c2410c;
  --ok: #0f766e;
  --shadow: 0 12px 36px rgba(17, 24, 39, 0.09);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, #ffffff 0, #eef3ff 40%, transparent 70%),
    linear-gradient(140deg, var(--bg-0), var(--bg-1));
  min-height: 100vh;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-top: 16px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.grid {
  display: grid;
  gap: 12px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.95rem;
}

input,
select,
button,
textarea {
  font: inherit;
}

input[type="text"],
input[type="number"],
input[type="file"],
select {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 10px 12px;
}

.input-preview {
  display: none;
  margin-top: 6px;
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: #f4f7ff;
}

.input-preview.visible {
  display: block;
}

.file-preview {
  margin: 6px 0 0;
  padding: 10px;
  border-radius: 10px;
  border: 1px dashed var(--line);
  background: #f4f7ff;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.checkbox-row {
  flex-direction: row;
  align-items: center;
  gap: 10px;
  padding-top: 24px;
}

.actions {
  display: flex;
  align-items: end;
}

.actions.full {
  grid-column: 1 / -1;
}

button {
  border: 0;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  font-weight: 700;
  padding: 11px 14px;
  cursor: pointer;
  transition:
    transform 120ms ease,
    background 120ms ease;
}

button:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.tab {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 180ms ease;
}

.result-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 14px;
}

.result-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  min-height: 180px;
}

.result-card h3 {
  margin: 0 0 8px;
  font-size: 0.97rem;
}

img {
  width: 100%;
  max-height: 340px;
  object-fit: contain;
  background: #f4f7ff;
  border: 1px dashed var(--line);
  border-radius: 10px;
}

.download {
  display: inline-block;
  margin-top: 8px;
  color: var(--ok);
  text-decoration: none;
  font-weight: 600;
}

.download.disabled {
  color: var(--muted);
  pointer-events: none;
}

.decoded {
  margin: 0;
  padding: 10px;
  border-radius: 10px;
  min-height: 60px;
  background: #f4f7ff;
  border: 1px dashed var(--line);
  font-family: "IBM Plex Mono", monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.log {
  margin: 12px 0 0;
  padding: 12px;
  border-radius: 10px;
  border: 1px dashed var(--line);
  background: #fbfdff;
  color: #1e293b;
  min-height: 58px;
  overflow: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86rem;
  white-space: pre-wrap;
}

.hint {
  margin: 10px 0 0;
  color: var(--muted);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 860px) {
  .grid.two,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .checkbox-row {
    padding-top: 6px;
  }
}