/* All-to-All Static Edition — Brutalism Design System (unified with file-to-png, unzip-tool) */
/* Fonts (Pretendard + IBM Plex Mono) are loaded via <link> in index.html to comply with CSP */

:root {
  --bg: #fafaf7;
  --ink: #0a0a0a;
  --ink-2: #666666;
  --ink-3: #999999;
  --accent: #ddff00;
  --surface: #ffffff;
  --surface-2: #f0f0eb;
  --danger: #ff3333;
  --success: #00cc44;
  --bw: 3px;
  --bw-thin: 2px;
  --shadow: 8px 8px 0 #0a0a0a;
  --shadow-sm: 4px 4px 0 #0a0a0a;
}

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

body {
  font-family: 'Pretendard', -apple-system, 'Segoe UI', "Malgun Gothic", sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 680px;
  padding: 48px 20px;
}

header { text-align: left; margin-bottom: 24px; }
h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--ink);
  letter-spacing: -0.03em;
  text-transform: uppercase;
}
.subtitle {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink-2);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Mode banner */
.mode-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-sm);
  border-radius: 0;
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 0.8rem;
}
.mode-badge {
  background: var(--ink);
  color: var(--accent);
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 0;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.mode-desc {
  color: var(--ink);
  flex: 1;
  font-weight: 600;
  font-size: 0.8rem;
}
.mode-link {
  color: var(--ink);
  text-decoration: none;
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  border: var(--bw-thin) solid var(--ink);
  background: var(--surface);
  padding: 6px 12px;
  border-radius: 0;
  transition: all 0.1s;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.mode-link:hover {
  background: var(--ink);
  color: var(--accent);
}

/* Drop Zone */
.dropzone {
  border: var(--bw) dashed var(--ink);
  border-radius: 0;
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.12s;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.dropzone:hover, .dropzone.drag-over {
  background: var(--accent);
  border-style: solid;
}
.dropzone:hover .dropzone-hint,
.dropzone.drag-over .dropzone-hint {
  color: var(--ink);
}
.dropzone-icon { font-size: 2.4rem; margin-bottom: 12px; }
.dropzone-text {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.dropzone-text strong {
  background: var(--ink);
  color: var(--accent);
  padding: 2px 8px;
}
.dropzone-hint {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink-2);
  font-size: 0.7rem;
  margin-top: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
#fileInput { display: none; }

/* File List */
.file-list {
  display: none;
  margin-top: 20px;
  background: var(--surface);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow);
  padding: 20px;
}
.file-list.show { display: block; }
.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: var(--bw-thin) solid var(--ink);
}
.file-count {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.75rem;
  color: var(--ink-2);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.file-count strong { color: var(--ink); }
.clear-btn {
  background: var(--surface);
  border: var(--bw-thin) solid var(--ink);
  border-radius: 0;
  color: var(--ink);
  cursor: pointer;
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.7rem;
  padding: 5px 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: all 0.1s;
}
.clear-btn:hover { background: var(--danger); color: var(--surface); }

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface-2);
  border: var(--bw-thin) solid var(--ink);
  border-radius: 0;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 0.85rem;
}
.file-ext {
  width: 42px; height: 28px;
  border-radius: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-weight: 700; font-size: 0.65rem;
  text-transform: uppercase;
  flex-shrink: 0;
  background: var(--ink);
  color: var(--accent);
  letter-spacing: 0.02em;
}
.file-ext.document {
  background: var(--ink);
  color: var(--accent);
}
.file-item-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--ink);
  font-weight: 500;
}
.file-item-size {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink-2);
  font-size: 0.72rem;
  flex-shrink: 0;
  font-weight: 600;
}
.file-item-remove {
  background: var(--surface);
  border: var(--bw-thin) solid var(--ink);
  color: var(--ink);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  padding: 0 8px;
  line-height: 1.4;
  transition: all 0.1s;
}
.file-item-remove:hover { background: var(--danger); color: var(--surface); }

/* Format Selection */
.format-section { display: none; margin-top: 20px; }
.format-section.show { display: block; }
.format-label {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.format-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.fmt-btn {
  padding: 14px 16px;
  border: var(--bw) solid var(--ink);
  border-radius: 0;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  transition: all 0.1s;
  text-align: left;
  min-width: 140px;
  flex: 1;
  box-shadow: var(--shadow-sm);
}
.fmt-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}
.fmt-btn.selected {
  background: var(--accent);
  color: var(--ink);
}
.fmt-name {
  font-weight: 800;
  font-size: 0.9rem;
  display: block;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.fmt-desc {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.68rem;
  color: var(--ink-2);
  display: block;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.fmt-btn.selected .fmt-desc { color: var(--ink); }

/* Convert Button */
.convert-btn {
  display: none;
  width: 100%;
  margin-top: 20px;
  padding: 16px;
  border: var(--bw) solid var(--ink);
  border-radius: 0;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.1s;
  background: var(--accent);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}
.convert-btn.show { display: block; }
.convert-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}
.convert-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

/* Progress */
.progress {
  display: none;
  margin-top: 20px;
  text-align: center;
  padding: 24px;
  background: var(--surface);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-sm);
}
.progress.show { display: block; }
.spinner {
  width: 36px; height: 36px;
  border: 4px solid var(--ink);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 14px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress-text {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Result */
.result {
  display: none;
  margin-top: 20px;
  padding: 20px;
  border-radius: 0;
  text-align: center;
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-sm);
}
.result.show { display: block; }
.result.success { background: var(--accent); }
.result.error { background: var(--danger); }
.result-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
  font-weight: 800;
  color: var(--ink);
}
.result.error .result-icon { color: var(--surface); }
.result-msg {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
}
.result.error .result-msg { color: var(--surface); }

.again-btn {
  margin-top: 14px;
  padding: 10px 20px;
  border: var(--bw-thin) solid var(--ink);
  border-radius: 0;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: all 0.1s;
}
.again-btn:hover { background: var(--ink); color: var(--accent); }

/* Unsupported notice */
.unsupported {
  display: none;
  margin-top: 20px;
  padding: 20px;
  border-radius: 0;
  text-align: center;
  background: var(--surface);
  border: var(--bw) solid var(--ink);
  box-shadow: var(--shadow-sm);
}
.unsupported.show { display: block; }
.unsupported-icon { font-size: 1.8rem; margin-bottom: 8px; }
.unsupported-title {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 800;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.unsupported-desc {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink-2);
  font-size: 0.75rem;
  margin-bottom: 14px;
  line-height: 1.6;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.unsupported-link {
  display: inline-block;
  color: var(--ink);
  text-decoration: none;
  border: var(--bw-thin) solid var(--ink);
  background: var(--accent);
  padding: 8px 16px;
  border-radius: 0;
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: all 0.1s;
}
.unsupported-link:hover { background: var(--ink); color: var(--accent); }

/* Supported formats */
.supported { margin-top: 32px; }
.supported-title {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  padding: 6px 10px;
  background: var(--ink);
  color: var(--accent);
  display: inline-block;
}
.sup-card {
  background: var(--surface);
  border: var(--bw-thin) solid var(--ink);
  border-radius: 0;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.sup-card-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.sup-from {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--ink);
  padding: 4px 10px;
  border-radius: 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.sup-arrow {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 800;
}
.sup-to { display: flex; flex-wrap: wrap; gap: 6px; }
.sup-target {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-weight: 700;
  font-size: 0.76rem;
  color: var(--ink);
  background: var(--accent);
  border: var(--bw-thin) solid var(--ink);
  padding: 3px 8px;
  border-radius: 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.sup-desc {
  font-size: 0.78rem;
  color: var(--ink-2);
  padding-left: 2px;
}

footer {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: var(--bw-thin) solid var(--ink);
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  color: var(--ink-2);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
footer a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
footer a:hover { background: var(--accent); }