:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
}
:root[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: #334155;
  --accent: #60a5fa;
  --accent-contrast: #0b1220;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.5);
}
* {
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 400px at 20% 0%, #eef2ff, transparent), radial-gradient(800px 300px at 80% 0%, #e0f2fe, transparent), var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
:root[data-theme="dark"] body {
  background: radial-gradient(1200px 400px at 20% 0%, #0b3a66, transparent), radial-gradient(800px 300px at 80% 0%, #0b2450, transparent), var(--bg);
}
.app-header {
  max-width: 980px;
  margin: 48px auto 24px;
  padding: 0 24px;
}
.brand {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.subtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 16px;
}
.privacy-banner {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14px;
  background: linear-gradient(0deg, rgba(99,102,241,0.08), rgba(99,102,241,0.08)), var(--surface);
}
:root[data-theme="dark"] .privacy-banner {
  background: linear-gradient(0deg, rgba(96,165,250,0.12), rgba(96,165,250,0.12)), var(--surface);
}
.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 960px) {
  .container {
    grid-template-columns: 1fr 1fr;
  }
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 24px;
}
.card-title {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
}
.card-desc {
  margin: 8px 0 20px;
  color: var(--muted);
}
.note {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 13px;
}
.field {
  margin: 14px 0;
}
.field label {
  display: block;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 6px;
}
input[type="text"],
input[type="file"] {
  width: 100%;
}
input[type="text"] {
  appearance: none;
  outline: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 16px;
  transition: box-shadow .2s, border-color .2s;
}
textarea {
  width: 100%;
  appearance: none;
  outline: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 16px;
  resize: vertical;
  min-height: 100px;
}
input[type="text"]:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 4px rgba(147, 197, 253, 0.35);
}
.actions {
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.hidden { display: none; }
.modal {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.45);
  display: grid;
  place-items: center;
  padding: 24px;
  z-index: 50;
}
.modal.hidden { display: none !important; }
.modal-content {
  width: min(720px, 96vw);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-title {
  font-size: 18px;
  font-weight: 600;
}
.modal-body {
  padding: 16px 20px 20px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 15px;
  cursor: pointer;
  transition: transform .05s ease, box-shadow .2s, background .2s, border-color .2s;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.12);
}
.btn:active {
  transform: translateY(0);
  box-shadow: none;
}
.btn.primary {
  border-color: transparent;
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn.ghost {
  background: transparent;
}
.btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}
.status {
  min-height: 20px;
  color: var(--muted);
  font-size: 14px;
}
.list-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 8px 0 10px;
}
.hint {
  font-size: 12px;
  color: var(--muted);
}
.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px dashed var(--border);
  border-radius: 12px;
  min-height: 64px;
}
.messages-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  border: 1px dashed var(--border);
  border-radius: 12px;
}
.message-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: #fafafa;
}
.message-item:last-child { border-bottom: none; }
.message-name {
  font-size: 14px;
  color: var(--muted);
}
.message-content {
  font-size: 15px;
}
.message-meta {
  font-size: 12px;
  color: var(--muted);
}
.file-item {
  display: grid;
  grid-template-columns: auto 1fr auto auto auto;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: #fafafa;
}
:root[data-theme="dark"] .file-item {
  background: #0b1220;
}
.file-item:last-child {
  border-bottom: none;
}
.file-item.dragging {
  opacity: 0.6;
}
.handle {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: linear-gradient(#cbd5e1 0 0) left/100% 3px no-repeat, linear-gradient(#cbd5e1 0 0) left/100% 3px no-repeat, linear-gradient(#cbd5e1 0 0) left/100% 3px no-repeat;
  background-position-y: 0, 6px, 12px;
}
.move {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
.filename {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.remove {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
.footer {
  max-width: 980px;
  margin: 12px auto 48px;
  padding: 0 24px;
  color: var(--muted);
  font-size: 13px;
}
@media (max-width: 640px) {
  .brand {
    font-size: 28px;
  }
  .card {
    border-radius: 14px;
    padding: 18px;
  }
  .file-item {
    grid-template-columns: auto 1fr auto auto;
  }
  .handle {
    display: none;
  }
}