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

:root {
  --bg: #f5f6f8;
  --surface: #fff;
  --border: #e2e5ea;
  --text: #1a1d23;
  --text-secondary: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.3px;
  color: var(--text);
}

header h1 span {
  color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
}

.btn:hover { background: #f0f1f3; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

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

.btn-danger {
  color: var(--danger);
  border-color: #fecaca;
}

.btn-danger:hover { background: #fef2f2; border-color: var(--danger); }

.btn-ghost {
  border-color: transparent;
  background: transparent;
}

.btn-ghost:hover { background: #f0f1f3; }

.btn-sm { padding: 5px 10px; font-size: 12px; }

.btn-logout {
  border-color: transparent;
  color: var(--text-secondary);
  font-size: 13px;
}

.btn-logout:hover { color: var(--text); background: #f0f1f3; }

.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.section-header h2 {
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-header .badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--bg);
  color: var(--text-secondary);
  padding: 2px 7px;
  border-radius: 10px;
}

.section-body { padding: 0; }

.drop-zone {
  margin: 16px 20px;
  padding: 28px 20px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: all .2s ease;
  position: relative;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background: #eff6ff;
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.drop-zone-icon {
  font-size: 24px;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.drop-zone-text {
  font-size: 13px;
  color: var(--text-secondary);
}

.drop-zone-text strong {
  color: var(--primary);
}

.file-list { list-style: none; }

.file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid #f3f4f6;
  transition: background .1s ease;
}

.file-row:last-child { border-bottom: none; }
.file-row:hover { background: #fafbfc; }

.file-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

.file-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity .15s ease;
}

.file-row:hover .file-actions { opacity: 1; }

.empty-state {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 32px;
  margin-bottom: 8px;
  opacity: .5;
}

.empty-state-text {
  font-size: 14px;
}

.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 40px 32px;
  text-align: center;
}

.login-card h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}

.login-card h1 span { color: var(--primary); }

.login-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-card input {
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  transition: border-color .15s ease;
  width: 100%;
}

.login-card input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }

.login-card .btn-primary {
  width: 100%;
  padding: 10px;
  font-size: 14px;
  justify-content: center;
}

.login-error {
  font-size: 13px;
  color: var(--danger);
  display: none;
}

.login-error.show { display: block; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--text);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all .3s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 600px) {
  .app { padding: 16px 12px 40px; }
  .section-header { padding: 12px 16px; }
  .file-row { padding: 10px 16px; }
  .file-actions { opacity: 1; }
  .drop-zone { margin: 12px 16px; }
}