/* === Reset & Custom Properties === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --surface2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;

  --success: #16a34a;
  --success-hover: #15803d;
  --success-light: #f0fdf4;
  --success-border: #bbf7d0;

  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --danger-light: rgba(220, 38, 38, 0.10);

  --shadow: 0 1px 4px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-full: 9999px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0f1a;
    --surface: #111827;
    --surface2: #1c2535;
    --border: #2d3f55;
    --text: #f1f5f9;
    --text-muted: #8ba3c7;
    --text-subtle: #4a6280;

    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1a2f50;

    --success: #34d399;
    --success-hover: #10b981;
    --success-light: #0d2520;
    --success-border: #065f46;

    --danger: #f87171;
    --danger-hover: #ef4444;
    --danger-light: rgba(248, 113, 113, 0.12);

    --shadow: 0 1px 4px rgba(0,0,0,0.4), 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.4);
  }
}

/* === Base === */
html { font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  -webkit-text-size-adjust: 100%;
}

/* === Layout === */
#container {
  width: 100%;
  max-width: 520px;
  padding: 16px 16px 48px;
}

/* === Header === */
.app-header {
  text-align: center;
  padding: 28px 0 20px;
}

.app-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
}

.app-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 5px;
}

/* === Privacy badge === */
.privacy-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 8px 18px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

/* === Card === */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

.section-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 0;
}

/* === Upload zone === */
.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 36px 20px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface2);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  text-align: center;
  -webkit-tap-highlight-color: transparent;
}

.upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.upload-icon-wrap {
  color: var(--text-subtle);
  transition: transform 0.2s, color 0.2s;
}

.upload-zone.dragover .upload-icon-wrap {
  color: var(--accent);
  transform: scale(1.1) translateY(-4px);
}

.upload-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.upload-hint {
  font-size: 13px;
  color: var(--text-muted);
}

/* === File list === */
.list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 10px;
}

.btn-add-more {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  min-height: 44px;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background 0.15s;
}

.btn-add-more:hover { background: var(--border); }

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.file-num {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-name {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.file-size {
  flex-shrink: 0;
  font-size: 11px;
  color: var(--text-subtle);
}

.file-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.icon-btn:hover:not(:disabled) {
  background: var(--border);
  color: var(--text);
}

.icon-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.icon-btn-danger:hover:not(:disabled) {
  background: var(--danger-light);
  color: var(--danger);
  border-color: var(--danger);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, opacity 0.15s;
  text-decoration: none;
  white-space: nowrap;
  min-height: 52px;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }

.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: var(--success-hover); }

.btn-ghost {
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  width: 100%;
}
.btn-ghost:hover { background: var(--border); }

.btn-block { width: 100%; }

/* === Progress === */
.progress-wrap { margin-bottom: 4px; }

.progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-muted);
  gap: 8px;
}

#progressText {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#progressPct {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--accent);
}

#progressContainer {
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--border);
  overflow: hidden;
}

#progressBar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* === Complete banner === */
.complete-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 16px;
  background: var(--success-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--success-border);
  color: var(--success);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 16px;
}

.complete-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--success);
  color: white;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 800;
  flex-shrink: 0;
}

.result-actions { margin-top: 12px; }

.note-small {
  font-size: 12px;
  color: var(--text-subtle);
  text-align: center;
  padding: 8px 0;
  line-height: 1.6;
}

/* === Info section === */
.info-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.info-toggle {
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: block;
  -webkit-tap-highlight-color: transparent;
}

.info-toggle::marker,
.info-toggle::-webkit-details-marker { display: none; }

.info-body {
  padding: 4px 20px 20px;
  border-top: 1px solid var(--border);
}

.info-body h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin: 16px 0 6px;
}

.info-body p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* === Caution === */
.caution {
  font-size: 12px;
  color: var(--text-subtle);
  text-align: center;
  line-height: 1.9;
  padding: 0 8px;
  margin-bottom: 24px;
}

/* === Footer === */
footer {
  padding: 24px 0 8px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-subtle);
}

footer p { margin-bottom: 12px; }

footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 16px;
  margin-bottom: 10px;
}

footer nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
}

footer nav a:hover { text-decoration: underline; }

/* === Responsive === */
@media (max-width: 480px) {
  .file-size { display: none; }
  .file-actions { gap: 2px; }
}

/* === FAQ section === */
.faq-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.faq-section h2 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  padding: 16px 20px 0;
  letter-spacing: 0.3px;
}

.faq-item {
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.faq-item:first-of-type { margin-top: 12px; }

.faq-q {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  padding: 14px 20px 6px;
}

.faq-a {
  font-size: 14px;
  color: var(--text-muted);
  padding: 0 20px 14px;
  line-height: 1.7;
}

/* === Utilities === */
.hidden { display: none !important; }