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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: #f5f7fa;
  color: #333;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid #e8e8e8;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 24px;
  font-weight: 600;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: #666;
}

/* Notice */
.notice {
  background: #e6f7ff;
  border: 1px solid #91d5ff;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 14px;
  color: #096dd9;
}

.notice.warning {
  background: #fff7e6;
  border-color: #ffd591;
  color: #d46b08;
}

.notice.error {
  background: #fff1f0;
  border-color: #ffa39e;
  color: #cf1322;
}

/* File List */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.file-card {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 12px;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: box-shadow 0.2s;
}

.file-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.file-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.file-meta {
  font-size: 13px;
  color: #999;
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  padding: 8px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

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

.btn-primary {
  background: #1890ff;
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: #40a9ff;
}

.btn-outline {
  background: transparent;
  border: 1px solid #d9d9d9;
  color: #666;
}

.btn-outline:hover {
  border-color: #1890ff;
  color: #1890ff;
}

.btn-full {
  width: 100%;
  padding: 12px;
  font-size: 16px;
}

.btn-download {
  background: #52c41a;
  color: #fff;
  padding: 10px 24px;
  font-size: 15px;
}

.btn-download:hover:not(:disabled) {
  background: #73d13d;
}

/* Login */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.login-box {
  background: #fff;
  border-radius: 16px;
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.login-box h1 {
  text-align: center;
  margin-bottom: 32px;
  font-size: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: #333;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #d9d9d9;
  border-radius: 8px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: #1890ff;
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
}

.error-msg {
  color: #ff4d4f;
  font-size: 13px;
  min-height: 20px;
  margin-bottom: 8px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal-header {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

.modal-body {
  font-size: 14px;
  color: #666;
  margin-bottom: 24px;
  line-height: 1.6;
}

/* Loading */
.loading {
  text-align: center;
  padding: 40px;
  color: #999;
  font-size: 14px;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 12px;
  }

  .header {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .file-card {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .login-box {
    padding: 32px 24px;
  }
}