@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Playfair+Display:wght@700;900&display=swap');

:root {
  --ink: #0d0c0e;
  --surface: #181719;
  --surface-raised: #201f23;
  --border: #2d2b30;
  --border-hover: #3d3a40;
  --copper: #c4865a;
  --copper-hover: #d49a6f;
  --copper-glow: rgba(196, 134, 90, 0.25);
  --text: #e6e2db;
  --text-dim: #8c8983;
  --text-faint: #56544e;
  --danger: #c95555;
  --danger-bg: rgba(201, 85, 85, 0.08);
  --success: #5d9b7a;
  --success-bg: rgba(93, 155, 122, 0.08);
  --radius: 10px;
  --radius-sm: 6px;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

@keyframes perforation-cycle {
  0% { background-position: 0 0; }
  100% { background-position: 8px 0; }
}

@keyframes fade-up {
  0% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  background: var(--ink);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 4rem 1.25rem 3rem;
}

.header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.header h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.15;
}

.subtitle {
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

.perforation {
  width: 40%;
  height: 1px;
  margin: 1.5rem auto;
  background-image: repeating-linear-gradient(
    to right,
    var(--text-faint) 0,
    var(--text-faint) 2px,
    transparent 2px,
    transparent 8px
  );
}

.form-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  animation: fade-up 0.5s ease-out both;
}

.mode-selector {
  margin-bottom: 1.5rem;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9375rem;
  color: var(--text-dim);
  transition: border-color 0.2s ease, background 0.2s ease;
  position: relative;
}

.radio-label:hover {
  border-color: var(--border-hover);
  background: var(--surface-raised);
}

.radio-label input[type="radio"] {
  opacity: 0;
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.radio-indicator {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s ease;
}

.radio-indicator::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--copper);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.radio-label input[type="radio"]:checked + .radio-indicator {
  border-color: var(--copper);
}

.radio-label input[type="radio"]:checked + .radio-indicator::after {
  opacity: 1;
}

.radio-label input[type="radio"]:checked ~ .radio-text,
.radio-label:has(input[type="radio"]:checked) .radio-text {
  color: var(--text);
}

.radio-label:has(input[type="radio"]:checked) {
  border-color: var(--copper);
  background: rgba(196, 134, 90, 0.06);
  color: var(--text);
}

.radio-text {
  transition: color 0.2s ease;
}

.file-upload-area {
  position: relative;
  margin-bottom: 1.25rem;
}

.perforation-frame {
  width: 100%;
  height: 1px;
  background-image: repeating-linear-gradient(
    to right,
    var(--text-faint) 0,
    var(--text-faint) 2px,
    transparent 2px,
    transparent 6px
  );
}

.file-upload-area .perforation-frame {
  margin: 0.75rem 0;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
}

.drop-zone:hover {
  border-color: var(--copper);
  background: var(--surface-raised);
}

.drop-zone.drag-over {
  border-color: var(--copper);
  background: rgba(196, 134, 90, 0.04);
  border-style: dashed;
}

.drop-zone input[type="file"] {
  opacity: 0;
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.file-icon {
  font-size: 2.75rem;
  opacity: 0.4;
  display: block;
  margin-bottom: 0.75rem;
}

.file-instruction {
  font-size: 0.9375rem;
  color: var(--text-dim);
}

.file-hint {
  font-size: 0.8125rem;
  color: var(--text-faint);
  margin-top: 0.35rem;
}

.file-name {
  font-size: 0.875rem;
  color: var(--copper);
  font-weight: 500;
  margin-top: 0.5rem;
  word-break: break-all;
  display: none;
}

.file-name.visible {
  display: block;
}

.btn-convert {
  display: block;
  width: 100%;
  padding: 0.9rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--copper);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  margin-top: 1.25rem;
  transition: all 0.2s ease;
  letter-spacing: 0.01em;
}

.btn-convert:hover:not(:disabled) {
  background: var(--copper-hover);
  box-shadow: 0 0 0 4px var(--copper-glow);
}

.btn-convert:active:not(:disabled) {
  transform: scale(0.985);
}

.btn-convert:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-convert:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}

.progress {
  margin-top: 0.75rem;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  display: none;
}

.progress.visible {
  display: block;
}

.progress-fill {
  height: 100%;
  width: 100%;
  background: var(--copper);
  animation: shimmer 1.5s ease-in-out infinite;
}

.messages {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.message {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  line-height: 1.5;
}

.message-error {
  background: var(--danger-bg);
  color: var(--danger);
  border-left: 3px solid var(--danger);
}

.message-success {
  background: var(--success-bg);
  color: var(--success);
  border-left: 3px solid var(--success);
}

.limits-section {
  margin-top: 3rem;
  text-align: center;
}

.limits-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-faint);
  margin-bottom: 0.35rem;
}

.limits-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.limits-item {
  font-size: 0.75rem;
  color: var(--text-faint);
  line-height: 1.8;
}

.mono {
  font-family: "SF Mono", "JetBrains Mono", "Cascadia Code", monospace;
}

@media (max-width: 480px) {
  .container {
    padding: 2rem 1rem 2rem;
  }

  .header h1 {
    font-size: 1.75rem;
  }

  .form-card {
    padding: 1.5rem 1.25rem;
  }

  .drop-zone {
    padding: 2rem 1rem;
  }

  .radio-label {
    padding: 0.75rem 0.85rem;
  }
}